/* BeyondThe.space: the course page (learn.html) and lessons (lessons/*.html). Same cockpit-glass palette as
   the app, set for reading: bigger type, roomy cards, and one accent colour per lesson (--accent). */
:root {
  --void: #03050a;
  --panel: rgba(14, 21, 34, 0.82);
  --panel-solid: #0c1320;
  --line: rgba(156, 184, 222, 0.14);
  --line-strong: rgba(156, 184, 222, 0.28);
  --ink: #e8eef7;
  --ink-body: #c9d3e1;
  --ink-dim: #8e9cb2;
  --ink-faint: #5d6a80;
  --amber: #ffb547;
  --ice: #93d6ff;
  --good: #7ee0a1;
  --bad: #ff7a66;
  --accent: #ffb547;
  --accent-ink: #160f02;
  --font-display: "Chakra Petch", "Segoe UI", system-ui, sans-serif;
  --font-body: "Barlow", "Segoe UI", system-ui, -apple-system, sans-serif;
  --font-data: "JetBrains Mono", ui-monospace, Menlo, monospace;
  --l-bar-h: 48px;
  --col: 760px;
  --wide: 1080px;
  color-scheme: dark;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: calc(var(--site-head-total, 0px) + 18px); }
body {
  margin: 0; min-height: 100vh; color: var(--ink); font: 400 17px/1.7 var(--font-body);
  background:
    radial-gradient(ellipse 80% 50% at 50% -8%, color-mix(in srgb, var(--accent) 16%, #12203b) 0%, transparent 62%),
    var(--void);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
}
body::before { /* a faint fixed star field behind everything */
  content: ""; position: fixed; inset: 0; z-index: -1; pointer-events: none; opacity: 0.55;
  background-image:
    radial-gradient(1px 1px at 12% 18%, #fff8 50%, transparent 51%), radial-gradient(1px 1px at 82% 12%, #fff6 50%, transparent 51%),
    radial-gradient(1.2px 1.2px at 64% 42%, #fff7 50%, transparent 51%), radial-gradient(1px 1px at 28% 72%, #fff5 50%, transparent 51%),
    radial-gradient(1px 1px at 91% 66%, #fff6 50%, transparent 51%), radial-gradient(1.4px 1.4px at 46% 88%, #fff5 50%, transparent 51%),
    radial-gradient(1px 1px at 6% 52%, #fff4 50%, transparent 51%), radial-gradient(1px 1px at 72% 82%, #fff4 50%, transparent 51%);
  background-size: 640px 640px;
}
a { color: var(--accent); text-underline-offset: 3px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 6px; }
button { font: inherit; color: inherit; cursor: pointer; }
svg { flex: none; }
b, strong { color: var(--ink); font-weight: 600; }
.wrap { width: min(var(--col), 100% - 32px); margin-inline: auto; }
.wrap-wide { width: min(var(--wide), 100% - 32px); margin-inline: auto; }
.eyebrow { margin: 0 0 8px; font: 500 12px/1.3 var(--font-data); letter-spacing: 0.16em; text-transform: uppercase; color: var(--accent); }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* ---------------------------------------------------------------- lesson: top bar */
.l-top {
  position: sticky; top: var(--site-head-total, 0px); z-index: 20;
  display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 12px;
  height: var(--l-bar-h); padding: 0 max(16px, env(safe-area-inset-left, 0px));
  background: rgba(3, 5, 10, 0.78); border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px) saturate(1.3); -webkit-backdrop-filter: blur(16px) saturate(1.3);
}
.l-course { display: inline-flex; align-items: center; gap: 8px; color: var(--ink); text-decoration: none; min-width: 0; }
.l-course svg { width: 18px; height: 18px; fill: none; stroke: var(--accent); stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.l-course span { display: flex; flex-direction: column; line-height: 1.15; min-width: 0; }
.l-course small { font: 500 10px var(--font-data); letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-faint); }
.l-course span { font: 600 14px/1.2 var(--font-display); letter-spacing: 0.04em; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.l-steps { display: flex; gap: 6px; }
.l-steps a {
  position: relative; width: 30px; height: 30px; border-radius: 50%; display: grid; place-items: center;
  font: 700 13px var(--font-display); color: var(--ink-dim); text-decoration: none;
  border: 1.5px solid color-mix(in srgb, var(--c) 45%, transparent); background: rgba(255, 255, 255, 0.02);
  transition: transform 0.15s;
}
.l-steps a:hover { transform: translateY(-1px); color: var(--ink); }
.l-steps a.now { background: var(--c); border-color: var(--c); color: #0b0d12; box-shadow: 0 0 18px color-mix(in srgb, var(--c) 55%, transparent); }
.l-steps a.done:not(.now)::after { content: ""; position: absolute; right: -2px; bottom: -2px; width: 11px; height: 11px; border-radius: 50%; background: var(--good) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12'%3E%3Cpath d='M3 6.2l2 2 4-4.4' fill='none' stroke='%23062012' stroke-width='1.8'/%3E%3C/svg%3E") center/100%; border: 1.5px solid var(--void); }
.l-stars { justify-self: end; display: inline-flex; align-items: center; gap: 6px; padding: 5px 12px 5px 9px; border-radius: 20px; background: rgba(255, 181, 71, 0.1); border: 1px solid rgba(255, 181, 71, 0.3); font: 600 13px var(--font-data); }
.l-stars svg { width: 17px; height: 17px; fill: var(--amber); }
.l-stars b { font-weight: 600; color: var(--amber); }

/* ---------------------------------------------------------------- lesson: hero */
.l-hero { padding: 56px 0 18px; }
.l-hero h1 { margin: 0; font: 700 clamp(38px, 7vw, 64px)/1.02 var(--font-display); letter-spacing: 0.01em; text-wrap: balance; }
.l-question { margin: 16px 0 0; font: 500 clamp(21px, 3.2vw, 27px)/1.35 var(--font-body); color: var(--accent); text-wrap: balance; }
.l-question::before { content: "“"; } .l-question::after { content: "”"; }
.l-lede { margin: 18px 0 0; font-size: 19px; color: var(--ink-body); max-width: 62ch; }
.l-meta { display: flex; flex-wrap: wrap; gap: 8px; margin: 22px 0 0; padding: 0; list-style: none; }
.l-meta li { display: inline-flex; align-items: center; gap: 7px; padding: 5px 12px; border-radius: 20px; border: 1px solid var(--line-strong); font: 500 13px var(--font-body); color: var(--ink-dim); }
.l-meta svg { width: 15px; height: 15px; fill: none; stroke: var(--accent); stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.l-goals { margin: 28px 0 0; padding: 20px 22px; border-radius: 18px; background: var(--panel); border: 1px solid var(--line); }
.l-goals h2 { margin: 0 0 10px; font: 600 13px var(--font-data); letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-dim); }
.l-goals ul { margin: 0; padding: 0; list-style: none; display: grid; gap: 8px; }
.l-goals li { position: relative; padding-left: 30px; color: var(--ink-body); line-height: 1.5; }
.l-goals li::before { content: ""; position: absolute; left: 0; top: 2px; width: 20px; height: 20px; border-radius: 6px; background: color-mix(in srgb, var(--accent) 18%, transparent) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3E%3Cpath d='M5.5 10.3l3 3 6-6.6' fill='none' stroke='white' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/16px no-repeat; }
.l-words { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.l-words span { padding: 3px 11px; border-radius: 8px; background: rgba(255, 255, 255, 0.04); border: 1px dashed var(--line-strong); font: 500 13px var(--font-data); color: var(--ink-dim); }

/* ---------------------------------------------------------------- lesson: parts and prose */
.l-part { padding: 46px 0 6px; scroll-margin-top: calc(var(--l-bar-h) + 12px); }
.dg, .qz { scroll-margin-top: calc(var(--l-bar-h) + 18px); }
.l-part > h2 { display: flex; align-items: center; gap: 14px; margin: 0 0 14px; font: 700 clamp(25px, 4vw, 32px)/1.15 var(--font-display); letter-spacing: 0.01em; text-wrap: balance; }
.l-part > h2 .n { flex: none; width: 40px; height: 40px; border-radius: 12px; display: grid; place-items: center; font-size: 19px; background: var(--accent); color: var(--accent-ink); box-shadow: 0 6px 24px -6px color-mix(in srgb, var(--accent) 70%, transparent); }
.l-part p, .l-part li { color: var(--ink-body); }
.l-part p { margin: 0 0 16px; max-width: 66ch; }
.l-part h3 { margin: 28px 0 8px; font: 600 20px/1.3 var(--font-display); letter-spacing: 0.02em; }
.l-part ul.dots { padding-left: 22px; margin: 0 0 16px; }
.l-part ul.dots li { margin: 4px 0; }
.l-part ul.dots li::marker { color: var(--accent); }
.hl { color: var(--accent); font-weight: 600; }
.box {
  position: relative; margin: 22px 0; padding: 16px 18px 16px 58px; border-radius: 16px;
  background: var(--panel); border: 1px solid var(--line);
}
.box::before { content: ""; position: absolute; left: 16px; top: 16px; width: 28px; height: 28px; border-radius: 9px; background: var(--bc, var(--ice)) var(--bi) center/18px no-repeat; }
.box > b:first-child { display: block; margin-bottom: 2px; font: 600 12px var(--font-data); letter-spacing: 0.14em; text-transform: uppercase; color: var(--bc, var(--ice)); }
.box p { margin: 0; max-width: none; }
.box p + p { margin-top: 8px; }
.box.fact { --bc: #93d6ff; --bi: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3E%3Cpath d='M10 2.5l1.9 4.6 4.9.4-3.7 3.2 1.1 4.8L10 13l-4.2 2.5 1.1-4.8-3.7-3.2 4.9-.4z' fill='%23051018'/%3E%3C/svg%3E"); }
.box.try { --bc: #7ee0a1; --bi: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3E%3Cpath d='M8 3.5v6.2L4 16.5h12l-4-6.8V3.5M6.8 3.5h6.4' fill='none' stroke='%23062012' stroke-width='1.8' stroke-linejoin='round'/%3E%3C/svg%3E"); }
.box.myth { --bc: #ff7a66; --bi: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3E%3Cpath d='M5.5 5.5l9 9M14.5 5.5l-9 9' stroke='%23200804' stroke-width='2.2' stroke-linecap='round'/%3E%3C/svg%3E"); }
.box.safe { --bc: #ffb547; --bi: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3E%3Cpath d='M10 3l7.5 13h-15z' fill='none' stroke='%23201203' stroke-width='1.8' stroke-linejoin='round'/%3E%3Cpath d='M10 8v3.6M10 13.6v.2' stroke='%23201203' stroke-width='2' stroke-linecap='round'/%3E%3C/svg%3E"); }
.box.math { --bc: #c7b4ff; --bi: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3E%3Cpath d='M4 6h12M4 14h12M10 3v6' stroke='%23140b2a' stroke-width='2' stroke-linecap='round'/%3E%3C/svg%3E"); }
.formula { display: block; margin: 10px 0; padding: 10px 14px; border-radius: 10px; background: rgba(255, 255, 255, 0.04); font: 500 17px var(--font-data); color: var(--ink); text-align: center; }

/* ---------------------------------------------------------------- scene player (js/learn/player.js) */
.sp { margin: 26px 0 30px; scroll-margin-top: calc(var(--l-bar-h) + 18px); }
.l-part .sp, .l-wide { width: min(var(--wide), 100vw - 32px); margin-left: 50%; transform: translateX(-50%); }
.sp-stage { position: relative; border-radius: 20px; overflow: hidden; background: #000; border: 1px solid var(--line-strong); box-shadow: 0 40px 90px -40px rgba(0, 0, 0, 0.9), 0 0 0 6px rgba(255, 255, 255, 0.015); }
.sp-view { position: relative; aspect-ratio: 16 / 9; background: radial-gradient(ellipse at 50% 120%, color-mix(in srgb, var(--accent) 20%, #0b1426), #02040a 70%); }
.sp-frame { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; display: block; background: #000; }
.sp-cover { position: absolute; inset: 0; display: grid; place-items: center; }
.sp-load { display: inline-flex; align-items: center; gap: 14px; padding: 12px 22px 12px 12px; border-radius: 40px; border: 1px solid var(--line-strong); background: rgba(6, 10, 18, 0.7); text-align: left; backdrop-filter: blur(8px); }
.sp-load:hover { border-color: var(--accent); }
.sp-load-icon { width: 48px; height: 48px; border-radius: 50%; display: grid; place-items: center; background: var(--accent); }
.sp-load-icon svg { width: 22px; height: 22px; fill: var(--accent-ink); margin-left: 3px; }
.sp-load b { display: block; font: 600 16px/1.2 var(--font-display); letter-spacing: 0.03em; }
.sp-load small { display: block; font-size: 13px; color: var(--ink-dim); line-height: 1.3; }
.sp-btn svg path[fill="none"] { stroke: currentColor; }
.sp-cap { position: absolute; left: 50%; bottom: 18px; width: min(74%, 700px); transform: translateX(-50%); text-align: center; pointer-events: none; z-index: 1; }
.sp-cap p {
  display: inline-block; margin: 0; padding: 10px 18px; border-radius: 14px;
  background: rgba(3, 6, 12, 0.8); border: 1px solid rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); box-shadow: 0 10px 30px rgba(0, 0, 0, 0.45);
  font: 500 17.5px/1.5 var(--font-body); color: #f4f7fb; text-wrap: balance;
}
.sp-cap p:empty { display: none; }
.sp-cap p b { color: var(--accent); }
.sp-cap p.in { animation: cap-in 0.5s cubic-bezier(0.2, 0.8, 0.2, 1); }
@keyframes cap-in { from { opacity: 0; transform: translateY(8px); } }
.sp.no-cc .sp-cap { display: none; }
.sp-note {
  position: absolute; top: 14px; left: 50%; transform: translateX(-50%); z-index: 2; max-width: min(56%, 460px);
  padding: 8px 14px; border-radius: 12px; background: rgba(6, 10, 18, 0.9); border: 1px solid color-mix(in srgb, var(--accent) 50%, transparent);
  font: 500 14px/1.4 var(--font-body); color: var(--ink); text-align: center; animation: cap-in 0.4s ease;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}
.sp-note b { color: var(--accent); }
/* the end of the intro film: a big hand in the middle of the view acts out the gestures, one 6.4s loop: first it drags
   across (the arc shows the way), then it spreads thumb and finger. It sits over the view without catching the pointer. */
.sp-view .sp-note:has(.sp-hand) {
  top: 50%; right: auto; bottom: auto; left: 50%; transform: translate(-50%, -50%); width: max-content; max-width: none;
  padding: 0; border: 0; border-radius: 0; background: none; box-shadow: none; pointer-events: none; animation: hand-in 0.6s ease both;
}
@keyframes hand-in { from { opacity: 0; } }
.sp-hand { display: grid; justify-items: center; gap: 10px; --hand-loop: 6.4s; }
.sp-hand-fig { position: relative; width: 300px; height: 200px; }
.sp-hand-fig::before { content: ""; position: absolute; inset: -30px -10px; border-radius: 50%; background: radial-gradient(closest-side, rgba(2, 4, 10, 0.6), transparent); }
.sp-hand p { margin: 0; display: grid; padding: 9px 18px; border-radius: 12px; background: rgba(6, 10, 18, 0.82); border: 1px solid color-mix(in srgb, var(--accent) 45%, transparent); font: 600 17px/1.3 var(--font-body); color: var(--ink); }
.sp-hand p span { grid-area: 1 / 1; text-align: center; animation: hand-say-a var(--hand-loop) infinite both; }
.sp-hand p span + span { animation-name: hand-say-b; }
.hd-arc { position: absolute; left: 10px; top: -6px; width: 280px; fill: none; stroke: color-mix(in srgb, var(--accent) 80%, transparent); stroke-width: 2.5; stroke-linecap: round; stroke-linejoin: round; stroke-dasharray: 1 7; animation: hand-arc var(--hand-loop) infinite both; }
.hd-arc path + path { stroke-dasharray: none; }
.hd { position: absolute; left: 50%; top: 4px; width: 150px; margin-left: -75px; overflow: visible; transform-origin: 50% 100%; filter: drop-shadow(0 8px 18px rgba(0, 0, 0, 0.55)); animation: hand-move var(--hand-loop) ease-in-out infinite both; }
.hd rect { fill: #f4f6fb; stroke: #1a2233; stroke-width: 2.5; }
.hd .hd-cuff { fill: var(--accent); }
.hd g { transform-box: view-box; }
.hd-index { transform-origin: 57.5px 78px; animation: hand-index var(--hand-loop) ease-in-out infinite both; }
.hd-thumb { transform-origin: 45.5px 98px; animation: hand-thumb var(--hand-loop) ease-in-out infinite both; }
.hd-tap { fill: color-mix(in srgb, var(--accent) 30%, transparent); stroke: var(--accent); stroke-width: 2.5; transform-box: fill-box; transform-origin: center; animation: hand-tap var(--hand-loop) ease-out infinite both; }
.hd-thumb .hd-tap { animation-name: hand-tap-thumb; }
@keyframes hand-move {
  0% { opacity: 0; transform: translateX(-50px); }
  6% { opacity: 1; transform: translateX(-50px); }
  10% { transform: translateX(-50px) scale(0.95); }
  34% { transform: translateX(50px) scale(0.95); }
  38% { opacity: 1; transform: translateX(50px); }
  45%, 50% { opacity: 0; transform: translateX(50px); }
  50.01% { opacity: 0; transform: none; }
  56% { opacity: 1; transform: none; }
  60%, 84% { transform: scale(0.97); }
  88% { opacity: 1; transform: none; }
  95%, 100% { opacity: 0; transform: none; }
}
@keyframes hand-index { 0%, 50% { transform: rotate(0); } 50.01%, 60% { transform: rotate(-4deg); } 84%, 95% { transform: rotate(14deg); } 100% { transform: rotate(0); } }
@keyframes hand-thumb { 0%, 50% { transform: rotate(-38deg); } 50.01%, 60% { transform: rotate(-8deg); } 84%, 95% { transform: rotate(-58deg); } 100% { transform: rotate(-38deg); } }
@keyframes hand-tap {
  0%, 8% { opacity: 0; transform: scale(0.3); }
  12%, 34% { opacity: 1; transform: scale(1); }
  40%, 58% { opacity: 0; transform: scale(1.4); }
  58.01% { transform: scale(0.3); }
  62%, 84% { opacity: 1; transform: scale(1); }
  90%, 100% { opacity: 0; transform: scale(1.4); }
}
@keyframes hand-tap-thumb {
  0%, 58% { opacity: 0; transform: scale(0.3); }
  62%, 84% { opacity: 1; transform: scale(1); }
  90%, 100% { opacity: 0; transform: scale(1.4); }
}
@keyframes hand-arc { 0%, 4% { opacity: 0; } 10%, 36% { opacity: 1; } 44%, 100% { opacity: 0; } }
@keyframes hand-say-a { 0%, 2% { opacity: 0; } 6%, 44% { opacity: 1; } 49%, 100% { opacity: 0; } }
@keyframes hand-say-b { 0%, 50% { opacity: 0; } 55%, 94% { opacity: 1; } 99%, 100% { opacity: 0; } }
@media (max-width: 640px) {
  .sp-view .sp-note:has(.sp-hand) { top: 58%; }
  .sp-hand-fig { width: 220px; height: 146px; }
  .hd { width: 110px; margin-left: -55px; }
  .hd-arc { left: 0; width: 220px; }
  .sp-hand p { font-size: 14.5px; }
}
@media (prefers-reduced-motion: reduce) {
  .hd, .hd g, .hd-tap, .hd-arc, .sp-hand p span { animation: none; }
  .hd-tap { opacity: 0; }
  .hd-thumb { transform: rotate(-38deg); }
  .sp-hand p span + span { display: none; }
}
.sp-toast {
  position: absolute; left: 50%; bottom: 18px; z-index: 4; max-width: calc(100% - 32px); transform: translate(-50%, 10px); opacity: 0;
  padding: 9px 16px; border-radius: 12px; background: rgba(6, 10, 18, 0.9); border: 1px solid var(--line-strong);
  font: 500 14px/1.4 var(--font-body); color: var(--ink); text-align: center; pointer-events: none; transition: opacity 0.3s, transform 0.3s;
}
.sp-toast.show { opacity: 1; transform: translate(-50%, 0); }
.sp-bar { display: flex; align-items: center; gap: 10px; padding: 12px 2px 0; }
.sp-btn {
  flex: none; height: 40px; min-width: 40px; display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 0 9px; border-radius: 12px; border: 1px solid var(--line-strong); background: rgba(255, 255, 255, 0.03); color: var(--ink-dim);
}
.sp-btn svg { width: 20px; height: 20px; fill: currentColor; }
.sp-btn svg [fill="none"], .sp-btn svg path.w { fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; }
.sp-btn:hover { color: var(--ink); border-color: color-mix(in srgb, var(--accent) 60%, transparent); }
.sp-btn[aria-pressed="true"] { color: var(--accent); border-color: color-mix(in srgb, var(--accent) 50%, transparent); background: color-mix(in srgb, var(--accent) 10%, transparent); }
.sp-btn[aria-pressed="false"] .w { display: none; }
.sp-voice { padding: 0 12px 0 10px; font: 600 13px var(--font-body); }
.sp-play { width: 48px; height: 48px; border-radius: 50%; border: 0; background: var(--accent); color: var(--accent-ink); }
.sp-play:hover { color: var(--accent-ink); filter: brightness(1.08); }
.sp-play svg { width: 22px; height: 22px; }
.sp-guide { color: var(--accent); border-color: color-mix(in srgb, var(--accent) 55%, transparent); font: 600 13px var(--font-body); padding: 0 12px 0 10px; animation: cap-in 0.3s ease; }
.sp-track { position: relative; flex: 1; min-width: 80px; height: 32px; cursor: pointer; touch-action: none; }
.sp-rail { position: absolute; left: 0; right: 0; top: 50%; height: 6px; margin-top: -3px; border-radius: 3px; background: rgba(255, 255, 255, 0.12); overflow: hidden; }
.sp-fill { height: 100%; width: 100%; background: linear-gradient(90deg, color-mix(in srgb, var(--accent) 60%, #fff0), var(--accent)); transform-origin: left; transform: scaleX(0); }
.sp-tick { position: absolute; top: 50%; width: 3px; height: 14px; margin: -7px 0 0 -1.5px; border-radius: 2px; background: rgba(255, 255, 255, 0.5); pointer-events: none; }
.sp-thumb { position: absolute; top: 50%; left: 0; width: 18px; height: 18px; margin: -9px 0 0 -9px; border-radius: 50%; background: #fff; border: 3px solid var(--accent); box-shadow: 0 2px 10px rgba(0, 0, 0, 0.6); pointer-events: none; }
.sp-track:focus-visible { outline: none; }
.sp-track:focus-visible .sp-thumb { box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 40%, transparent); }
.sp-time { flex: none; font: 500 13px var(--font-data); color: var(--ink-dim); font-variant-numeric: tabular-nums; }
.sp-rate { flex: none; display: inline-flex; align-items: center; gap: 7px; padding: 5px 10px; border-radius: 10px; background: rgba(147, 214, 255, 0.07); border: 1px solid rgba(147, 214, 255, 0.2); font: 500 12px var(--font-data); color: var(--ice); white-space: nowrap; }
.sp-rate::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--ink-faint); }
.sp-rate.live::before { background: var(--ice); box-shadow: 0 0 8px var(--ice); animation: blink 1.2s ease-in-out infinite; }
@keyframes blink { 50% { opacity: 0.3; } }
.sp-chapters { display: flex; gap: 8px; padding: 14px 2px 2px; overflow-x: auto; scrollbar-width: none; }
.sp-chapters::-webkit-scrollbar { display: none; }
.sp-chapters button { flex: none; display: inline-flex; align-items: center; gap: 8px; padding: 6px 14px 6px 6px; border-radius: 22px; border: 1px solid var(--line-strong); background: rgba(255, 255, 255, 0.025); color: var(--ink-dim); font: 500 14px var(--font-body); }
.sp-chapters i { width: 24px; height: 24px; border-radius: 50%; display: grid; place-items: center; background: rgba(255, 255, 255, 0.07); font: 700 12px var(--font-display); font-style: normal; color: var(--ink); }
.sp-chapters button:hover { color: var(--ink); border-color: color-mix(in srgb, var(--accent) 60%, transparent); }
.sp-chapters button.on { color: var(--ink); border-color: var(--accent); background: color-mix(in srgb, var(--accent) 12%, transparent); }
.sp-chapters button.on i { background: var(--accent); color: var(--accent-ink); }
.sp-presets { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-top: 12px; padding: 12px 14px; border-radius: 16px; background: var(--panel); border: 1px solid var(--line); }
.sp-presets > span { margin-right: 4px; font: 500 11px var(--font-data); letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-faint); }
.sp-presets button { padding: 7px 14px; border-radius: 10px; border: 1px solid var(--line-strong); background: rgba(255, 255, 255, 0.03); color: var(--ink); font: 500 14px var(--font-body); }
.sp-presets button:hover { border-color: var(--accent); }
.sp-presets button.on { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); font-weight: 600; }
.sp-challenges { margin-top: 12px; padding: 14px 16px; border-radius: 16px; background: linear-gradient(135deg, rgba(126, 224, 161, 0.08), transparent 60%), var(--panel); border: 1px solid rgba(126, 224, 161, 0.25); }
.sp-ch-head { display: flex; flex-wrap: wrap; align-items: baseline; gap: 4px 10px; margin-bottom: 8px; }
.sp-ch-head b { font: 600 12px var(--font-data); letter-spacing: 0.16em; text-transform: uppercase; color: var(--good); }
.sp-ch-head span { font-size: 14px; color: var(--ink-dim); }
.sp-challenges ul { margin: 0; padding: 0; list-style: none; display: grid; gap: 6px; }
.sp-challenges li { display: flex; align-items: flex-start; gap: 10px; color: var(--ink-body); font-size: 16px; line-height: 1.45; }
.sp-challenges li svg { width: 22px; height: 22px; margin-top: 0; fill: none; stroke: var(--ink-faint); stroke-width: 1.6; stroke-linejoin: round; transition: fill 0.3s, stroke 0.3s; }
.sp-challenges li.done svg { fill: var(--amber); stroke: var(--amber); }
.sp-challenges li.done span { color: var(--ink); }
.sp-challenges li.pop svg { animation: pop 0.7s cubic-bezier(0.2, 1.6, 0.4, 1); }
@keyframes pop { 0% { transform: scale(0.4) rotate(-30deg); } 100% { transform: none; } }
/* full screen (or filling the window where full screen isn't allowed, as on iPhone) */
.sp:fullscreen, .sp.theater { display: flex; flex-direction: column; width: 100%; max-width: none; margin: 0; padding: 12px max(12px, env(safe-area-inset-right)) max(12px, env(safe-area-inset-bottom)) max(12px, env(safe-area-inset-left)); background: #000; transform: none; }
.sp.theater { position: fixed; inset: 0; z-index: 100; }
.sp:fullscreen .sp-stage, .sp.theater .sp-stage { flex: 1; min-height: 0; display: flex; flex-direction: column; border-radius: 14px; }
.sp:fullscreen .sp-view, .sp.theater .sp-view { flex: 1; aspect-ratio: auto; min-height: 0; }
.sp:fullscreen :is(.sp-presets, .sp-challenges), .sp.theater :is(.sp-presets, .sp-challenges) { display: none; }
.sp:fullscreen .sp-cap p, .sp.theater .sp-cap p { font-size: 20px; }

/* ---------------------------------------------------------------- questions (js/learn/quiz.js) */
.qz { margin: 26px 0; padding: 22px; border-radius: 20px; background: var(--panel); border: 1px solid var(--line); }
.qz-predict { border-color: color-mix(in srgb, var(--accent) 35%, transparent); background: linear-gradient(135deg, color-mix(in srgb, var(--accent) 9%, transparent), transparent 55%), var(--panel); }
.qz-head { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 14px; margin-bottom: 12px; }
.qz-tag { font: 600 12px var(--font-data); letter-spacing: 0.16em; text-transform: uppercase; color: var(--accent); }
.qz-count { font: 500 13px var(--font-data); color: var(--ink-faint); }
.qz-dots { display: flex; gap: 5px; margin-left: auto; }
.qz-dots i { width: 22px; height: 5px; border-radius: 3px; background: rgba(255, 255, 255, 0.1); }
.qz-dots i.past { background: color-mix(in srgb, var(--accent) 55%, transparent); }
.qz-dots i.now { background: var(--accent); }
.qz-q { margin: 0 0 16px; font: 600 21px/1.4 var(--font-body); color: var(--ink); text-wrap: pretty; }
.qz-options { display: grid; gap: 10px; }
.qz-options button {
  display: flex; align-items: center; gap: 14px; width: 100%; padding: 12px 16px 12px 12px; border-radius: 14px;
  border: 1.5px solid var(--line-strong); background: rgba(255, 255, 255, 0.025); text-align: left; font: 500 17px/1.4 var(--font-body); color: var(--ink);
  transition: border-color 0.15s, background 0.15s, transform 0.1s;
}
.qz-options button:not(:disabled):hover { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 7%, transparent); }
.qz-options button:not(:disabled):active { transform: scale(0.99); }
.qz-options i { flex: none; width: 32px; height: 32px; border-radius: 10px; display: grid; place-items: center; background: rgba(255, 255, 255, 0.07); font: 700 14px var(--font-display); font-style: normal; color: var(--ink-dim); }
.qz-options button:disabled { cursor: default; opacity: 0.55; }
.qz-options button.right { opacity: 1; border-color: var(--good); background: rgba(126, 224, 161, 0.1); }
.qz-options button.right i { background: var(--good); color: #062012; }
.qz-options button.wrong { opacity: 1; border-color: var(--bad); background: rgba(255, 122, 102, 0.08); animation: shake 0.4s; }
.qz-options button.wrong i { background: var(--bad); color: #200804; }
@keyframes shake { 25% { transform: translateX(-5px); } 50% { transform: translateX(5px); } 75% { transform: translateX(-3px); } }
.qz-why { margin-top: 14px; padding: 14px 16px; border-radius: 14px; background: rgba(255, 255, 255, 0.035); animation: cap-in 0.35s ease; }
.qz-why p { margin: 0; color: var(--ink-body); }
.qz-why b.ok { color: var(--good); } .qz-why b.no { color: var(--bad); }
.qz-then { margin-top: 8px !important; font-weight: 600; color: var(--accent) !important; }
.qz-next { display: inline-flex; align-items: center; gap: 8px; margin-top: 12px; padding: 10px 18px; border-radius: 12px; border: 0; background: var(--accent); color: var(--accent-ink); font: 600 15px var(--font-body); }
.qz-next svg, .l-next svg, .btn svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.qz-result { text-align: center; padding: 8px 0 4px; }
.qz-stars { display: flex; justify-content: center; gap: 8px; }
.qz-stars svg { width: 44px; height: 44px; fill: rgba(255, 255, 255, 0.08); stroke: rgba(255, 255, 255, 0.2); stroke-width: 1; }
.qz-stars svg.on { fill: var(--amber); stroke: var(--amber); animation: pop 0.6s cubic-bezier(0.2, 1.6, 0.4, 1) backwards; animation-delay: var(--d); filter: drop-shadow(0 0 10px rgba(255, 181, 71, 0.5)); }
.qz-score { margin: 12px 0 2px !important; font: 600 24px var(--font-display); }
.qz-result p { margin: 4px 0; color: var(--ink-body); }
.qz-again { margin-top: 12px; padding: 9px 18px; border-radius: 12px; border: 1px solid var(--line-strong); background: none; color: var(--ink); font: 600 15px var(--font-body); }
.qz-again:hover { border-color: var(--accent); }

/* ---------------------------------------------------------------- diagrams (js/learn/diagrams.js) */
.dg { margin: 26px 0; padding: 18px; border-radius: 20px; background: var(--panel); border: 1px solid var(--line); }
.dg-head { display: flex; flex-wrap: wrap; align-items: baseline; gap: 4px 12px; margin-bottom: 10px; }
.dg-head b { font: 600 12px var(--font-data); letter-spacing: 0.16em; text-transform: uppercase; color: var(--accent); }
.dg-head span { font-size: 14px; color: var(--ink-dim); }
.dg svg.dg-art { display: block; width: 100%; height: auto; overflow: visible; }
.dg-art text { font-family: var(--font-body); fill: var(--ink-body); }
.dg-row { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 16px; margin-top: 14px; }
.dg-row label { display: flex; align-items: center; gap: 12px; flex: 1 1 260px; font: 500 14px var(--font-body); color: var(--ink-dim); }
.dg-row output { min-width: 9ch; font: 600 15px var(--font-data); color: var(--ink); }
.dg-read { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 10px; margin-top: 14px; }
.dg-read div { padding: 10px 12px; border-radius: 12px; background: rgba(255, 255, 255, 0.035); }
.dg-read small { display: block; font: 500 11px var(--font-data); letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-faint); }
.dg-read b { font: 600 18px var(--font-display); letter-spacing: 0.02em; }
.dg-seg { display: inline-flex; padding: 3px; border-radius: 12px; background: rgba(255, 255, 255, 0.05); border: 1px solid var(--line); }
.dg-seg button { padding: 7px 14px; border: 0; border-radius: 9px; background: none; color: var(--ink-dim); font: 500 14px var(--font-body); }
.dg-seg button[aria-pressed="true"] { background: var(--accent); color: var(--accent-ink); font-weight: 600; }
.dg input[type="range"] { flex: 1; min-width: 120px; height: 28px; margin: 0; background: transparent; -webkit-appearance: none; appearance: none; cursor: pointer; }
.dg input[type="range"]::-webkit-slider-runnable-track { height: 6px; border-radius: 3px; background: linear-gradient(90deg, color-mix(in srgb, var(--accent) 40%, transparent), var(--accent)); }
.dg input[type="range"]::-moz-range-track { height: 6px; border-radius: 3px; background: linear-gradient(90deg, color-mix(in srgb, var(--accent) 40%, transparent), var(--accent)); }
.dg input[type="range"]::-webkit-slider-thumb { -webkit-appearance: none; width: 24px; height: 24px; margin-top: -9px; border-radius: 50%; background: #fff; border: 4px solid var(--accent); box-shadow: 0 2px 10px rgba(0, 0, 0, 0.5); }
.dg input[type="range"]::-moz-range-thumb { width: 16px; height: 16px; border-radius: 50%; background: #fff; border: 4px solid var(--accent); }
.dg input[type="number"], .dg select { width: 7ch; padding: 7px 10px; border-radius: 10px; border: 1px solid var(--line-strong); background: rgba(255, 255, 255, 0.04); color: var(--ink); font: 600 16px var(--font-data); }
.dg select { width: auto; font: 500 15px var(--font-body); }
.dg table { width: 100%; border-collapse: collapse; margin-top: 12px; font-size: 15px; }
.dg th { text-align: left; font: 500 11px var(--font-data); letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-faint); padding: 6px 8px; border-bottom: 1px solid var(--line); }
.dg td { padding: 8px; border-bottom: 1px solid var(--line); color: var(--ink-body); font-variant-numeric: tabular-nums; }
.dg td:first-child { display: flex; align-items: center; gap: 9px; color: var(--ink); font-weight: 500; }
.dg td i { width: 12px; height: 12px; border-radius: 50%; background: var(--c); box-shadow: 0 0 8px var(--c); }
.dg td .bar { display: block; height: 8px; border-radius: 4px; background: var(--c); min-width: 2px; }
.dg-caption { margin: 10px 0 0; font-size: 14.5px; color: var(--ink-dim); line-height: 1.55; }
.dg-seg { flex-wrap: wrap; max-width: 100%; }
/* a live 3D model in a diagram (the ISS explorer): drag to turn it, tap a part */
.dg-3d { position: relative; margin-top: 4px; border-radius: 14px; overflow: hidden; background: radial-gradient(ellipse at 50% 120%, #1b3a6a 0%, #070b14 55%, #03050a 100%); }
.dg-3d canvas { display: block; width: 100%; cursor: grab; }
.dg-3d canvas:active { cursor: grabbing; }
.dg-pick { position: absolute; left: 12px; bottom: 12px; max-width: min(360px, calc(100% - 24px)); padding: 10px 13px; border-radius: 12px; background: rgba(6, 10, 18, 0.86); border: 1px solid var(--line-strong); font-size: 14px; line-height: 1.45; color: var(--ink-body); pointer-events: none; }
.dg-pick b { display: block; font: 600 16px var(--font-display); color: var(--ink); }
.dg-pick small { display: block; font: 500 11px var(--font-data); letter-spacing: 0.08em; text-transform: uppercase; }
.dg-pick span { display: block; margin-top: 3px; }
.dg-pick em { display: block; margin-top: 5px; font-style: normal; font-size: 12.5px; color: var(--ink-faint); }
.dg-legend { display: flex; flex-wrap: wrap; gap: 6px 14px; margin-top: 10px; font-size: 13px; color: var(--ink-dim); }
.dg-legend i { display: inline-block; width: 10px; height: 10px; margin-right: 6px; border-radius: 3px; vertical-align: -1px; }
@media (max-width: 560px) { .dg-pick { position: static; max-width: none; margin: 8px; } }

/* ---------------------------------------------------------------- lesson: wrap-up */
.l-keys { margin: 26px 0; padding: 22px; border-radius: 20px; background: linear-gradient(135deg, color-mix(in srgb, var(--accent) 12%, transparent), transparent 60%), var(--panel); border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent); }
.l-keys ol { margin: 0; padding: 0; list-style: none; counter-reset: k; display: grid; gap: 12px; }
.l-keys li { counter-increment: k; position: relative; padding-left: 44px; color: var(--ink-body); }
.l-keys li::before { content: counter(k); position: absolute; left: 0; top: -1px; width: 30px; height: 30px; border-radius: 50%; display: grid; place-items: center; background: var(--accent); color: var(--accent-ink); font: 700 14px var(--font-display); }
.l-gloss { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 10px; margin: 18px 0 0; }
.l-gloss div { padding: 12px 14px; border-radius: 14px; background: rgba(255, 255, 255, 0.03); border: 1px solid var(--line); }
.l-gloss dt { font: 600 15px var(--font-display); letter-spacing: 0.03em; color: var(--accent); }
.l-gloss dd { margin: 2px 0 0; font-size: 15px; line-height: 1.5; color: var(--ink-body); }
.l-next { margin: 40px 0 0; }
.l-next a {
  position: relative; display: grid; gap: 2px; padding: 22px 70px 22px 24px; border-radius: 22px; text-decoration: none; color: var(--ink);
  background: linear-gradient(120deg, color-mix(in srgb, var(--c) 22%, transparent), transparent 70%), var(--panel); border: 1px solid color-mix(in srgb, var(--c) 45%, transparent);
  transition: transform 0.2s, box-shadow 0.2s;
}
.l-next a:hover { transform: translateY(-2px); box-shadow: 0 20px 50px -20px color-mix(in srgb, var(--c) 60%, transparent); }
.l-next small { font: 500 12px var(--font-data); letter-spacing: 0.14em; text-transform: uppercase; color: var(--c); }
.l-next b { font: 700 26px/1.2 var(--font-display); }
.l-next span { color: var(--ink-dim); }
.l-next a > svg { position: absolute; right: 24px; top: 50%; width: 28px; height: 28px; margin-top: -14px; color: var(--c); }
.l-foot { margin: 56px 0 0; padding: 26px 0 40px; border-top: 1px solid var(--line); font-size: 13.5px; color: var(--ink-faint); }
.l-foot a { color: var(--ink-dim); }
.l-toast {
  position: fixed; left: 50%; bottom: max(20px, env(safe-area-inset-bottom)); z-index: 50; transform: translate(-50%, 140%);
  display: flex; align-items: center; gap: 12px; padding: 10px 18px 10px 12px; border-radius: 16px;
  background: rgba(16, 13, 6, 0.94); border: 1px solid rgba(255, 181, 71, 0.5); box-shadow: 0 16px 50px rgba(0, 0, 0, 0.6), 0 0 30px rgba(255, 181, 71, 0.2);
  transition: transform 0.45s cubic-bezier(0.2, 1.3, 0.4, 1);
}
.l-toast.show { transform: translate(-50%, 0); }
.l-toast svg { width: 34px; height: 34px; fill: var(--amber); filter: drop-shadow(0 0 8px rgba(255, 181, 71, 0.6)); }
.l-toast.show svg { animation: pop 0.7s cubic-bezier(0.2, 1.6, 0.4, 1); }
.l-toast span { display: flex; flex-direction: column; font-size: 14px; color: var(--ink-body); line-height: 1.35; }
.l-toast b { font: 700 15px var(--font-display); letter-spacing: 0.04em; color: var(--amber); }
.l-locked main { visibility: hidden; max-height: 100vh; overflow: hidden; } /* a locked lesson is not shown at all, just the card below */
.l-gate { position: fixed; inset: calc(var(--site-head-total, 0px) + var(--l-bar-h)) 0 0; z-index: 30; display: grid; place-items: center; padding: 16px; }
.l-gate-card { width: min(460px, 100%); padding: 28px; border-radius: 24px; background: var(--panel-solid); border: 1px solid color-mix(in srgb, var(--accent) 40%, transparent); text-align: center; box-shadow: 0 30px 80px rgba(0, 0, 0, 0.7); }
.l-gate-tag { font: 600 12px var(--font-data); letter-spacing: 0.16em; text-transform: uppercase; color: var(--accent); }
.l-gate h2 { margin: 8px 0; font: 700 28px/1.15 var(--font-display); }
.l-gate p { color: var(--ink-body); }
.l-gate-go { display: inline-flex; align-items: center; gap: 8px; padding: 12px 22px; border-radius: 14px; background: var(--accent); color: var(--accent-ink); font-weight: 700; text-decoration: none; }
.l-gate-go { border: 0; font: 700 16px var(--font-body, inherit); cursor: pointer; }
.l-gate-go svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 2; }
.l-gate-back { display: block; margin-top: 14px; color: var(--ink-dim); font-size: 14px; }
button.l-gate-back { margin-inline: auto; background: none; border: 0; padding: 0; font: inherit; font-size: 14px; cursor: pointer; text-decoration: underline; }
.l-gate-note { margin: 14px 0 0; color: var(--amber, #ffb547); font-size: 14.5px; }

/* ---------------------------------------------------------------- course page (learn.html) */
.c-hero { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr); align-items: center; gap: 40px; padding: 56px 0 36px; }
.c-hero h1 { margin: 0; font: 700 clamp(40px, 5.6vw, 62px)/1.02 var(--font-display); letter-spacing: 0.005em; text-wrap: balance; }
.c-hero h1 em { font-style: normal; background: linear-gradient(90deg, #ffb547, #ff8a66); -webkit-background-clip: text; background-clip: text; color: transparent; }
.c-hero p { margin: 18px 0 0; font-size: 19px; color: var(--ink-body); max-width: 46ch; }
.c-cta { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 26px; }
.btn { display: inline-flex; align-items: center; gap: 9px; padding: 13px 22px; border-radius: 14px; font: 600 16px var(--font-body); text-decoration: none; border: 1px solid transparent; }
.btn.primary { background: var(--amber); color: #1d1203; box-shadow: 0 10px 34px -10px rgba(255, 181, 71, 0.7); }
.btn.primary:hover { filter: brightness(1.06); }
.btn.ghost { border-color: var(--line-strong); color: var(--ink); }
.btn.ghost:hover { border-color: var(--amber); }
/* the film in the hero (js/learn/intro-scene.js): a poster with a big play button, then the lesson player with title cards */
.c-film.sp { margin: 0; }
.film .sp-view { aspect-ratio: 4 / 3; }
.film .sp-cover { z-index: 3; }
.film .sp-cap p { font-size: 15.5px; }
.film .sp-note { left: auto; right: 14px; transform: none; max-width: 44%; text-align: left; }
.film .sp-chapters button { padding: 4px 12px 4px 4px; font-size: 13.5px; }
.film .sp-chapters i { width: 21px; height: 21px; font-size: 11px; }
/* keep the hero calm: no controls until the film is playing, and no chapter chips or time-rate pill (the timeline's ticks mark the chapters) */
.film:not(.started) .sp-bar, .film .sp-chapters, .film .sp-rate { display: none; }
.film:is(:fullscreen, .theater) .sp-chapters { display: flex; }
.sp-go { display: block; margin-top: 8px; padding: 6px 14px; border-radius: 10px; border: 0; background: var(--accent); color: var(--accent-ink); font: 600 13px var(--font-body); cursor: pointer; }
.sp-poster, .ip { position: absolute; inset: 0; overflow: hidden; }
.ip-tiles { position: absolute; inset: -18%; display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; transform: rotate(-9deg); animation: ip-drift 40s ease-in-out infinite alternate; }
.ip-tiles i { border-radius: 14px; background: center / cover no-repeat; opacity: 0.45; }
.ip::after { content: ""; position: absolute; inset: 0; background: radial-gradient(ellipse at 50% 42%, rgba(2, 4, 10, 0.15), rgba(2, 4, 10, 0.85) 72%), linear-gradient(0deg, rgba(2, 4, 10, 0.96), transparent 58%); }
.ip-text { position: absolute; left: 22px; right: 22px; bottom: 20px; z-index: 1; pointer-events: none; }
.ip-tag { font: 500 11.5px var(--font-data); letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-dim); }
.ip-text b { display: block; margin-top: 6px; font: 700 clamp(19px, 2.2vw, 24px)/1.15 var(--font-display); }
.sp-load.sp-big { position: absolute; inset: 0; z-index: 1; display: grid; place-items: center; padding: 0 0 12%; border: 0; border-radius: 0; background: none; backdrop-filter: none; cursor: pointer; }
.sp-big .sp-load-icon { width: 72px; height: 72px; background: rgba(255, 255, 255, 0.92); box-shadow: 0 12px 40px -8px rgba(0, 0, 0, 0.7); transition: transform 0.2s, background 0.2s; }
.sp-big:hover .sp-load-icon { background: var(--accent); }
.sp-big:hover .sp-load-icon { transform: scale(1.06); }
.sp-big .sp-load-icon svg { width: 30px; height: 30px; fill: #0b0f18; }
@keyframes ip-drift { to { transform: rotate(-9deg) translate(-4%, -6%); } }
/* title cards over the live view: they build in, chips one after another, and slide away at the next */
.sp-card { position: absolute; left: 16px; top: 16px; z-index: 1; width: min(54%, 330px); pointer-events: none; }
.sp-card-in { position: absolute; left: 0; top: 0; width: 100%; }
.ic {
  padding: 14px 16px; border-radius: 16px; border: 1px solid color-mix(in srgb, var(--c, var(--amber)) 40%, transparent);
  background: linear-gradient(135deg, color-mix(in srgb, var(--c, var(--amber)) 18%, transparent), transparent 70%), rgba(4, 7, 14, 0.74);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); box-shadow: 0 20px 50px -20px rgba(0, 0, 0, 0.8);
  animation: ic-in 0.7s cubic-bezier(0.2, 0.8, 0.2, 1) both;
}
.sp-card-in.out .ic { animation: ic-out 0.4s ease both; }
.ic small { display: block; font: 500 10.5px var(--font-data); letter-spacing: 0.14em; text-transform: uppercase; color: var(--c, var(--amber)); }
.ic b { display: block; margin-top: 4px; font: 700 20px/1.12 var(--font-display); color: var(--ink); }
.ic ul, .ic ol { display: flex; flex-wrap: wrap; gap: 5px; margin: 10px 0 0; padding: 0; list-style: none; }
.ic li {
  padding: 3px 9px; border-radius: 20px; font: 500 12px/1.3 var(--font-body); color: var(--ink);
  background: color-mix(in srgb, var(--c) 16%, rgba(255, 255, 255, 0.03)); border: 1px solid color-mix(in srgb, var(--c) 45%, transparent);
  animation: ic-chip 0.5s cubic-bezier(0.2, 1.4, 0.4, 1) both; animation-delay: calc(0.35s + var(--k) * 0.09s);
}
.ic p { margin: 10px 0 0; font-size: 13px; line-height: 1.4; color: var(--ink-body); animation: ic-chip 0.5s ease 1.1s both; }
.ic p i { display: block; margin-bottom: 2px; font: 500 10px var(--font-data); font-style: normal; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-faint); }
.ic-cta b { font-style: normal; background: linear-gradient(90deg, #ffb547, #ff7a66 35%, #c7b4ff 70%, #6fe3ff); -webkit-background-clip: text; background-clip: text; color: transparent; }
.ic-steps ol { display: grid; gap: 6px; }
.ic-steps li { display: flex; align-items: center; gap: 9px; padding: 5px 12px 5px 5px; border-radius: 12px; font-size: 14px; }
.ic-steps li i { width: 22px; height: 22px; border-radius: 50%; display: grid; place-items: center; background: var(--c); color: #0b0f18; font: 700 11px var(--font-display); font-style: normal; }
.ic-cta { position: relative; pointer-events: auto; }
.ic-cta small { padding-right: 28px; }
.ic-x {
  position: absolute; top: 8px; right: 8px; width: 30px; height: 30px; display: grid; place-items: center; padding: 0; border-radius: 50%;
  border: 1px solid var(--line-strong); background: rgba(255, 255, 255, 0.04); color: var(--ink-dim); cursor: pointer; transition: color 0.2s, border-color 0.2s;
}
.ic-x:hover, .ic-x:focus-visible { color: var(--ink); border-color: var(--accent); }
.ic-x svg { width: 14px; height: 14px; }
.ic-go { display: inline-flex; align-items: center; gap: 8px; margin-top: 10px; padding: 9px 16px; border-radius: 12px; background: var(--amber); color: #1d1203; font: 600 15px var(--font-body); text-decoration: none; animation: ic-chip 0.5s ease 0.3s both; }
.ic-go svg { width: 16px; height: 16px; }
.ic-go:hover { filter: brightness(1.08); }
.ic-cta li { padding: 0; }
.ic-cta li a { display: block; padding: 3px 9px; color: inherit; text-decoration: none; }
.ic-cta li:hover { border-color: var(--c); }
.ic-cta p { font-size: 12.5px; color: var(--ink-dim); }
@keyframes ic-in { from { opacity: 0; transform: translateX(-18px) scale(0.97); filter: blur(6px); } }
@keyframes ic-out { to { opacity: 0; transform: translateY(-10px); filter: blur(4px); } }
@keyframes ic-chip { from { opacity: 0; transform: translateY(6px) scale(0.9); } }
.c-section { padding: 56px 0 8px; }
.c-section > h2 { margin: 0 0 6px; font: 700 clamp(28px, 4.4vw, 40px)/1.1 var(--font-display); text-wrap: balance; }
.c-section > p.sub { margin: 0 0 24px; color: var(--ink-dim); font-size: 18px; max-width: 60ch; }
.c-std { width: 100%; border-collapse: collapse; font-size: 15px; }
.c-std th { text-align: left; font: 500 11px var(--font-data); letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-faint); padding: 8px 10px; border-bottom: 1px solid var(--line-strong); }
.c-std td { padding: 12px 10px; border-bottom: 1px solid var(--line); color: var(--ink-body); vertical-align: top; }
.c-std td:first-child { white-space: nowrap; font: 600 13px var(--font-data); color: var(--ink); }
.c-std-wrap { overflow-x: auto; border-radius: 18px; background: var(--panel); border: 1px solid var(--line); padding: 6px 10px; }
.c-plans { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 16px; align-items: stretch; }
.c-plan { display: flex; flex-direction: column; padding: 24px; border-radius: 24px; background: var(--panel); border: 1px solid var(--line); }
.c-plan.featured { border-color: rgba(255, 181, 71, 0.55); background: linear-gradient(160deg, rgba(255, 181, 71, 0.13), transparent 50%), var(--panel); box-shadow: 0 30px 70px -36px rgba(255, 181, 71, 0.6); }
.c-plan .pn { font: 600 13px var(--font-data); letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-dim); }
.c-plan.featured .pn { color: var(--amber); }
.c-plan .pp { margin: 8px 0 14px; font: 700 40px/1 var(--font-display); }
.c-plan .pp small { margin-left: 6px; font: 500 14px var(--font-body); color: var(--ink-dim); }
.c-plan ul { margin: 0 0 20px; padding: 0; list-style: none; display: grid; gap: 8px; }
.c-plan li { position: relative; padding-left: 26px; color: var(--ink-body); font-size: 15.5px; line-height: 1.45; }
.c-plan li::before { content: ""; position: absolute; left: 0; top: 3px; width: 17px; height: 17px; background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3E%3Cpath d='M5 10.3l3.2 3.2 6.6-7' fill='none' stroke='%237ee0a1' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/contain no-repeat; }
.c-plan .btn { margin-top: auto; justify-content: center; }
.c-note { margin: 14px 0 0; font-size: 13.5px; color: var(--ink-faint); }
.c-foot { margin-top: 60px; padding: 28px 0 44px; border-top: 1px solid var(--line); display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; font-size: 14px; color: var(--ink-faint); }
.c-foot a { color: var(--ink-dim); }
.c-toast { position: fixed; left: 50%; bottom: 24px; z-index: 50; transform: translate(-50%, 160%); padding: 12px 18px; border-radius: 14px; background: var(--panel-solid); border: 1px solid var(--line-strong); color: var(--ink); transition: transform 0.4s cubic-bezier(0.2, 1.3, 0.4, 1); }
.c-toast:not(.show) { visibility: hidden; transition: transform 0.4s, visibility 0s 0.4s; }
.c-toast.show { transform: translate(-50%, 0); }

/* ---------------------------------------------------------------- small screens */
@media (max-width: 860px) {
  .c-hero { grid-template-columns: 1fr; gap: 28px; padding-top: 36px; }
}
@media (max-width: 640px) {
  :root { --l-bar-h: 44px; }
  body { font-size: 16.5px; }
  .l-top { grid-template-columns: auto 1fr auto; gap: 8px; }
  .l-course span { display: none; }
  .l-steps { justify-content: center; gap: 4px; }
  .l-steps a { width: 27px; height: 27px; font-size: 12px; }
  .l-stars { padding: 4px 9px 4px 7px; font-size: 12px; }
  .l-hero { padding-top: 34px; }
  .sp-view { aspect-ratio: 4 / 5; }
  .sp-stage { border-radius: 16px; }
  .sp-cap { position: static; width: auto; transform: none; text-align: left; padding: 0; border-top: 1px solid var(--line); }
  .sp-cap p { display: block; border: 0; border-radius: 0; background: #070b14; padding: 12px 14px; font-size: 16px; box-shadow: none; min-height: 3.2em; }
  .sp-note { top: auto; bottom: 12px; max-width: calc(100% - 80px); font-size: 13px; }
  .sp-bar { flex-wrap: wrap; gap: 8px; }
  .sp-track { order: -1; flex: 1 1 100%; }
  .sp-time { margin-right: auto; }
  .sp-guide span { display: none; }
  .sp-voice { padding: 0 9px; }
  .sp-voice span { display: none; }
  .sp-rate { order: 5; flex: 1 1 100%; justify-content: center; }
  .film .sp-view { aspect-ratio: 1 / 1; }
  .sp-card { left: 10px; top: 10px; width: calc(100% - 20px); }
  .ic { padding: 11px 13px; }
  .ic b { font-size: 17px; }
  .ic li { font-size: 11px; padding: 2px 8px; }
  .ic p { display: none; }
  .film .sp-note { top: auto; right: 10px; bottom: 10px; max-width: 70%; }
  .qz { padding: 18px 16px; }
  .qz-q { font-size: 19px; }
  .qz-options button { font-size: 16px; }
  .box { padding: 14px 14px 14px 52px; }
  .box::before { left: 13px; top: 14px; }
  .l-next a { padding: 18px 56px 18px 18px; }
  .l-next b { font-size: 22px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .sp-rate.live::before, .ip-tiles { animation: none; }
}

.c-std tr.c-std-course td { padding-top: 18px; font: 600 11px var(--font-data); letter-spacing: 0.14em; text-transform: uppercase; color: var(--amber); border-bottom-color: var(--line-strong); }

/* ---------------------------------------------------------------- learn.html: the landing page */
.c-hero .eyebrow { color: var(--ink-dim); }
.c-hero .c-assure { display: flex; align-items: center; gap: 6px; margin: 20px 0 0; font-size: 14.5px; color: var(--ink-faint); }
.c-assure svg { width: 16px; height: 16px; fill: var(--amber); }
.c-assure b { color: var(--ink-dim); }
.c-ticks li::before { content: ""; position: absolute; left: 0; top: 4px; width: 16px; height: 16px; background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3E%3Cpath d='M5 10.3l3.2 3.2 6.6-7' fill='none' stroke='%237ee0a1' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/contain no-repeat; }
.btn svg { width: 18px; height: 18px; flex: none; }
.btn.sm { padding: 10px 16px; font-size: 15px; border-radius: 12px; }

/* the numbers at a glance */
.c-proof { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); margin: 18px 0 0; padding: 0; list-style: none; border: 1px solid var(--line); border-radius: 20px; background: var(--panel); }
.c-proof li { display: flex; flex-direction: column; gap: 2px; padding: 18px 22px; }
.c-proof li + li { border-left: 1px solid var(--line); }
.c-proof b { font: 700 30px/1.1 var(--font-display); color: var(--ink); }
.c-proof span { font-size: 14.5px; line-height: 1.4; color: var(--ink-dim); }

/* how it works: a real lesson beside four steps */
.c-section > .eyebrow { margin-bottom: 6px; }
.c-inside { display: grid; grid-template-columns: minmax(0, 1.12fr) minmax(0, 1fr); gap: 36px; align-items: center; }
.c-shot { margin: 0; }
.c-shot img { display: block; width: 100%; height: auto; border-radius: 20px; border: 1px solid var(--line-strong); box-shadow: 0 40px 90px -40px rgba(0, 0, 0, 0.95), 0 0 0 6px rgba(255, 255, 255, 0.02); }
.c-shot figcaption { margin-top: 10px; font: 500 12.5px var(--font-data); color: var(--ink-faint); }
.c-steps { display: grid; gap: 22px; margin: 0; padding: 0; list-style: none; }
.c-steps li { display: grid; grid-template-columns: 44px 1fr; gap: 16px; align-items: start; }
.c-steps li > span { width: 44px; height: 44px; border-radius: 14px; display: grid; place-items: center; font: 700 19px var(--font-display); color: #0b0d12; background: var(--c); }
.c-steps h3 { margin: 2px 0 4px; font: 600 20px/1.2 var(--font-display); letter-spacing: 0.01em; }
.c-steps p { margin: 0; color: var(--ink-dim); font-size: 16px; line-height: 1.55; }

/* the four courses */
.c-cat { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; align-items: start; }
.c-cc { display: flex; flex-direction: column; overflow: hidden; border-radius: 24px; background: var(--panel-solid); border: 1px solid var(--line); transition: border-color 0.2s, box-shadow 0.2s; }
.c-cc:hover { border-color: color-mix(in srgb, var(--c) 55%, transparent); box-shadow: 0 30px 70px -40px color-mix(in srgb, var(--c) 70%, transparent); }
.c-cover { position: relative; aspect-ratio: 16 / 8; background: #02040a; }
.c-cover img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.c-cover::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, transparent 40%, var(--panel-solid) 99%); }
.c-cn { position: absolute; z-index: 1; left: 18px; top: 16px; padding: 4px 11px; border-radius: 20px; font: 600 11.5px var(--font-data); letter-spacing: 0.14em; text-transform: uppercase; color: #0b0d12; background: var(--c); }
.c-ac { position: absolute; z-index: 1; right: 18px; top: 16px; display: inline-flex; align-items: center; gap: 6px; padding: 4px 11px; border-radius: 20px; font: 600 11.5px var(--font-data); letter-spacing: 0.14em; text-transform: uppercase; background: rgba(3, 5, 10, 0.72); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px); }
.c-ac.free { color: var(--good); border: 1px solid rgba(126, 224, 161, 0.5); }
.c-ac.paid { color: var(--ink); border: 1px solid var(--line-strong); }
.c-ac svg { width: 13px; height: 13px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.c-cc-body { padding: 4px 24px 22px; margin-top: -34px; position: relative; z-index: 1; }
.c-cc h3 { margin: 0 0 8px; font: 700 clamp(23px, 2.6vw, 28px)/1.15 var(--font-display); letter-spacing: 0.01em; }
.c-cc-body > p { margin: 0; color: var(--ink-body); font-size: 16px; line-height: 1.55; }
.c-meta { display: flex; flex-wrap: wrap; gap: 6px 16px; margin: 12px 0 0; padding: 0; list-style: none; font: 500 12.5px var(--font-data); color: var(--ink-faint); }
.c-cc-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 14px; margin-top: 18px; }
.c-more { padding: 8px 4px; border: 0; background: none; color: var(--c); font: 600 15px var(--font-body); cursor: pointer; }
.c-more:hover { text-decoration: underline; text-underline-offset: 3px; }

/* plans */
.c-plan { position: relative; }
.c-best { position: absolute; top: -12px; right: 20px; padding: 4px 12px; border-radius: 20px; font: 600 11px var(--font-data); letter-spacing: 0.12em; text-transform: uppercase; color: #1d1203; background: var(--amber); }

/* parents and teachers */
.c-grown { display: grid; grid-template-columns: minmax(0, 1fr); gap: 28px; }
.c-grown .c-ticks { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px 36px; }
.c-grown h2 { margin: 0 0 18px; font: 700 clamp(26px, 3.6vw, 34px)/1.15 var(--font-display); }
.c-ticks { display: grid; gap: 14px; margin: 0; padding: 0; list-style: none; }
.c-ticks li { position: relative; padding-left: 28px; color: var(--ink-dim); font-size: 16px; line-height: 1.55; }
.c-ticks li b { color: var(--ink); font-weight: 600; }
.c-map { grid-column: 1 / -1; border-radius: 20px; background: var(--panel); border: 1px solid var(--line); }
.c-map summary { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 18px 20px; cursor: pointer; list-style: none; font: 600 16px var(--font-body); }
.c-map summary::-webkit-details-marker { display: none; }
.c-map summary::after { content: "+"; font: 500 22px/1 var(--font-data); color: var(--amber); }
.c-map[open] summary::after { content: "−"; }
.c-map summary small { margin-left: auto; font: 500 12px var(--font-data); color: var(--ink-faint); }
.c-map .c-std-wrap { border: 0; border-top: 1px solid var(--line); border-radius: 0 0 20px 20px; max-height: 520px; overflow: auto; background: none; }

/* FAQ */
.c-faq { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 2fr); gap: 8px 36px; align-items: start; }
.c-faq h2 { margin: 0 0 14px; font: 700 clamp(26px, 3.6vw, 34px)/1.15 var(--font-display); }
.c-faq details { border-bottom: 1px solid var(--line); }
.c-faq summary { display: flex; justify-content: space-between; gap: 16px; padding: 16px 0; cursor: pointer; list-style: none; font: 600 17.5px var(--font-body); }
.c-faq summary::-webkit-details-marker { display: none; }
.c-faq summary::after { content: "+"; font: 500 22px/1 var(--font-data); color: var(--amber); }
.c-faq details[open] summary::after { content: "−"; }
.c-faq details p { margin: 0 0 18px; color: var(--ink-dim); font-size: 16px; line-height: 1.6; }

/* last call */
.c-final { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 18px 28px; margin-top: 64px; padding: 32px 34px; border-radius: 26px; border: 1px solid rgba(255, 181, 71, 0.35); background: radial-gradient(ellipse 70% 120% at 0% 0%, rgba(255, 181, 71, 0.16), transparent 60%), radial-gradient(ellipse 60% 120% at 100% 100%, rgba(147, 214, 255, 0.12), transparent 60%), var(--panel-solid); }
.c-final h2 { margin: 0 0 4px; font: 700 clamp(24px, 3.4vw, 32px)/1.15 var(--font-display); }
.c-final p { margin: 0; color: var(--ink-dim); }
.c-final .c-cta { margin: 0; }

@media (max-width: 960px) {
  .c-inside, .c-grown, .c-faq { grid-template-columns: 1fr; gap: 28px; }
  .c-grown .c-ticks { grid-template-columns: 1fr; }
}
@media (max-width: 860px) {
  .c-cat { grid-template-columns: 1fr; }
  .c-plan.featured { order: -1; } /* the one most people want, first */
  .c-plan.featured { margin-top: 12px; }
  .c-proof { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .c-proof li:nth-child(3) { border-left: 0; }
  .c-proof li:nth-child(n + 3) { border-top: 1px solid var(--line); }
}
@media (max-width: 640px) {
  .c-proof b { font-size: 24px; }
  .c-proof li { padding: 14px 16px; }
  .c-cc-body { padding: 4px 18px 18px; }
  .c-final { padding: 24px 20px; }
}

/* a course's own page (courses/<id>.html, js/learn/course-page.js) */
.cp-free { color: var(--good); }
.cp-paid { display: inline-flex; align-items: center; gap: 6px; color: var(--ink-dim); }
.cp-paid svg { width: 13px; height: 13px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.cp-hero { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr); gap: 44px; align-items: center; padding: 48px 0 24px; }
.cp-hero .eyebrow { color: var(--c); }
.cp-hero h1 { margin: 0 0 14px; font: 700 clamp(38px, 5.6vw, 62px)/1.02 var(--font-display); text-wrap: balance; }
.cp-tag { margin: 0; color: var(--ink-body); font-size: 18.5px; line-height: 1.55; max-width: 46ch; }
button.btn { background: none; cursor: pointer; }
.cp-live { position: relative; margin: 0; aspect-ratio: 4 / 3; border-radius: 26px; overflow: hidden; border: 1px solid var(--line-strong); background: #02040a; box-shadow: 0 50px 100px -44px color-mix(in srgb, var(--c) 65%, transparent); }
.cp-live img, .cp-live iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; object-fit: cover; }
.cp-live img { transition: transform 6s ease-out, opacity 0.3s; }
.cp-live:hover img { transform: scale(1.04); }
.cp-live.on img { opacity: 0; }
.cp-play { position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%); display: inline-flex; align-items: center; gap: 10px; padding: 14px 22px 14px 16px; border-radius: 40px; border: 1px solid rgba(255, 255, 255, 0.25); background: rgba(3, 5, 10, 0.55); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); color: var(--ink); font: 600 16px var(--font-body); cursor: pointer; transition: transform 0.2s, background 0.2s; }
.cp-play:hover { transform: translate(-50%, -50%) scale(1.05); background: rgba(3, 5, 10, 0.75); }
.cp-play svg { width: 30px; height: 30px; padding: 7px 6px 7px 8px; box-sizing: border-box; border-radius: 50%; fill: #0b0d12; background: var(--c); }
.cp-live figcaption { position: absolute; left: 14px; bottom: 12px; pointer-events: none; font: 500 12px var(--font-data); color: var(--ink-dim); text-shadow: 0 1px 6px #000; }
.cp-live.on figcaption { display: none; }
.cp-why { margin-top: 40px; padding: 34px 0; border-block: 1px solid var(--line); text-align: center; }
.cp-why h2 { margin: 0 auto 22px; max-width: 22ch; font: 700 clamp(26px, 4vw, 40px)/1.12 var(--font-display); text-wrap: balance; }
.cp-why h2 em { font-style: normal; color: var(--c); }
.cp-why ul { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px 28px; margin: 0; padding: 0; list-style: none; text-align: left; color: var(--ink-dim); font-size: 16px; line-height: 1.5; }
.cp-why b { display: block; margin-bottom: 2px; color: var(--ink); font: 600 17px var(--font-display); letter-spacing: 0.01em; }
.cp-h { margin: 0 0 16px; font: 700 clamp(24px, 3.4vw, 32px)/1.1 var(--font-display); }
.cd-head em.lock { display: grid; place-items: center; padding: 3px 7px; }
.cd-head em.lock svg { width: 14px; height: 14px; fill: none; stroke: var(--ink-dim); stroke-width: 1.8; }
.cd-more .btn { margin-top: 18px; }
.cp-buy { display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr); gap: 24px 40px; align-items: center; margin-top: 56px; padding: 34px 36px; border-radius: 28px; border: 1px solid color-mix(in srgb, var(--c) 45%, transparent); background: radial-gradient(ellipse 80% 140% at 0% 0%, color-mix(in srgb, var(--c) 16%, transparent), transparent 60%), var(--panel-solid); }
.cp-buy:empty { display: none; }
.cp-pitch .eyebrow { color: var(--c); }
.cp-pitch h2 { margin: 0 0 16px; font: 700 clamp(28px, 4vw, 42px)/1.08 var(--font-display); }
.cp-ticks { display: grid; gap: 10px; margin: 0; padding: 0; list-style: none; }
.cp-ticks li { position: relative; padding-left: 28px; color: var(--ink-body); font-size: 16.5px; }
.cp-ticks li::before { content: ""; position: absolute; left: 0; top: 4px; width: 17px; height: 17px; background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3E%3Cpath d='M5 10.3l3.2 3.2 6.6-7' fill='none' stroke='%237ee0a1' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/contain no-repeat; }
.cp-price { display: flex; flex-direction: column; align-items: center; gap: 4px; text-align: center; }
.cp-price > b { font: 700 64px/1 var(--font-display); }
.cp-price > small { margin-bottom: 14px; font: 500 13px var(--font-data); letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-dim); }
.cp-price .btn { width: 100%; justify-content: center; }
.cp-in { margin-top: 8px; padding: 6px; border: 0; background: none; color: var(--ink-dim); font: 14px var(--font-body); text-decoration: underline; text-underline-offset: 3px; cursor: pointer; }
.cp-in:hover { color: var(--ink); }
.cp-owned { grid-column: 1 / -1; display: flex; align-items: center; gap: 18px; }
.cp-owned svg { flex: 0 0 auto; width: 46px; height: 46px; fill: var(--c); }
.cp-owned h2 { margin: 0 0 4px; font: 700 26px/1.15 var(--font-display); }
.cp-owned p { margin: 0; color: var(--ink-dim); }
.cp-more { margin-top: 56px; }
.cp-more > div { display: flex; flex-wrap: wrap; gap: 8px; }
.cp-more a { display: inline-flex; align-items: center; gap: 9px; padding: 7px 15px 7px 7px; border-radius: 30px; border: 1px solid var(--line); background: var(--panel); color: var(--ink-dim); text-decoration: none; font: 500 15px var(--font-body); transition: color 0.2s, border-color 0.2s; }
.cp-more a:hover { color: var(--ink); border-color: color-mix(in srgb, var(--c) 60%, transparent); }
.cp-more a b { width: 26px; height: 26px; border-radius: 50%; display: grid; place-items: center; font: 700 13px var(--font-display); color: #0b0d12; background: var(--c); }
.cd-lessons { display: grid; gap: 10px; margin: 0; padding: 0; list-style: none; }
.cd-l { border-radius: 18px; background: var(--panel); border: 1px solid var(--line); transition: border-color 0.2s; }
.cd-l.open, .cd-l:hover { border-color: color-mix(in srgb, var(--c) 45%, transparent); }
.cd-head { display: grid; grid-template-columns: 34px 1fr auto auto 20px; align-items: center; gap: 14px; width: 100%; padding: 14px 16px; border: 0; background: none; color: var(--ink); text-align: left; font: inherit; cursor: pointer; }
.cd-head b { width: 34px; height: 34px; border-radius: 11px; display: grid; place-items: center; font: 700 16px var(--font-display); color: #0b0d12; background: var(--c); }
.cd-head strong { display: block; font: 600 17.5px/1.3 var(--font-body); }
.cd-head small { display: block; font-size: 15px; line-height: 1.35; color: var(--ink-dim); }
.cd-head i { font: 500 12px var(--font-data); font-style: normal; color: var(--ink-faint); white-space: nowrap; }
.cd-head em { padding: 2px 9px; border-radius: 20px; font: 600 10.5px var(--font-data); font-style: normal; letter-spacing: 0.08em; text-transform: uppercase; white-space: nowrap; }
.cd-head em.free { color: var(--good); border: 1px solid rgba(126, 224, 161, 0.4); }
.cd-head em.done { color: #062012; background: var(--good); }
.cd-head em.st { color: var(--amber); border: 1px solid rgba(255, 181, 71, 0.4); }
.cd-head em.lock { color: var(--ink-dim); border: 1px solid var(--line-strong); }
.cd-head:not(:has(em)) { grid-template-columns: 34px 1fr auto 20px; }
.cd-chev { width: 10px; height: 10px; justify-self: center; border-right: 2px solid var(--ink-dim); border-bottom: 2px solid var(--ink-dim); transform: rotate(45deg) translate(-2px, -2px); transition: transform 0.2s; }
.cd-l.open .cd-chev { transform: rotate(-135deg) translate(-2px, -2px); }
.cd-more { padding: 0 16px 18px 64px; }
.cd-blurb { margin: 0 0 16px; color: var(--ink-body); font-size: 16px; line-height: 1.55; }
.cd-cols { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px 28px; }
.cd-cols h3 { margin: 0 0 8px; font: 600 11.5px var(--font-data); letter-spacing: 0.14em; text-transform: uppercase; color: var(--c); }
.cd-topics, .cd-goals { margin: 0; padding: 0; list-style: none; display: grid; gap: 7px; font-size: 15.5px; line-height: 1.45; color: var(--ink-body); }
.cd-topics { counter-reset: t; }
.cd-topics li:not(.cd-wait) { counter-increment: t; display: grid; grid-template-columns: 26px 1fr; }
.cd-topics li:not(.cd-wait)::before { content: counter(t); font: 600 13px/1.6 var(--font-data); color: var(--ink-faint); }
.cd-goals li { position: relative; padding-left: 22px; }
.cd-goals li::before { content: ""; position: absolute; left: 0; top: 4px; width: 15px; height: 15px; background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3E%3Cpath d='M5 10.3l3.2 3.2 6.6-7' fill='none' stroke='%237ee0a1' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/contain no-repeat; }
.cd-wait { color: var(--ink-faint); }
.cd-l mark { background: rgba(255, 181, 71, 0.3); color: var(--ink); border-radius: 3px; padding: 0 2px; }
@media (max-width: 860px) {
  .cp-hero, .cp-buy { grid-template-columns: 1fr; }
  .cp-hero { gap: 28px; padding-top: 28px; }
  .cp-live { order: -1; }
  .cp-why ul { grid-template-columns: 1fr; }
  .cp-buy { padding: 26px 22px; }
  .cd-more { padding-left: 16px; }
  .cd-cols { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .cd-head { grid-template-columns: 30px 1fr auto 16px; gap: 10px; padding: 12px; }
  .cd-head:not(:has(em)) { grid-template-columns: 30px 1fr 16px; }
  .cd-head b { width: 30px; height: 30px; }
  .cd-head i { display: none; }
}
.c-cc h3 a { color: inherit; text-decoration: none; }
.c-cc h3 a:hover { text-decoration: underline; text-underline-offset: 4px; }
.c-more.c-details { text-decoration: none; }
.c-more.c-details::after { content: " →"; }


/* ---------------------------------------------------------------- "Sign up for 2 more free lessons" (js/learn/signup-offer.js): the popup is in sitehead.css, this is the inline card */
.offer-inline { display: flex; align-items: center; gap: 16px; margin: 16px 0 0; padding: 18px 20px; border-radius: 22px; background: linear-gradient(120deg, rgba(255, 181, 71, 0.14), transparent 70%), var(--panel); border: 1px solid rgba(255, 181, 71, 0.4); }
.offer-inline > .offer-icon { flex: none; }
.offer-inline > div { flex: 1; min-width: 0; display: grid; gap: 2px; }
.offer-inline b { font: 700 19px/1.25 var(--font-display); }
.offer-inline span { color: var(--ink-dim); font-size: 15px; line-height: 1.45; }
.offer-inline .btn { flex: none; cursor: pointer; }
@media (max-width: 640px) {
  .offer-inline { flex-wrap: wrap; }
  .offer-inline .btn { width: 100%; justify-content: center; }
}

/* ---------------------------------------------------------------- free lessons: the "x free lessons" chip, the sign-up lessons' badge and the arrival animation */
.c-meta .c-fr { display: inline-flex; align-items: center; gap: 6px; padding: 2px 10px; border-radius: 20px; color: var(--amber); border: 1px solid rgba(255, 181, 71, 0.45); background: rgba(255, 181, 71, 0.08); }
.c-meta .c-fr svg { width: 14px; height: 14px; }
.c-meta .c-fr.none { color: var(--ink-faint); border-color: var(--line); background: none; }
.c-new { position: absolute; z-index: 1; left: 18px; bottom: 44px; display: none; align-items: center; gap: 6px; padding: 5px 12px; border-radius: 20px; font: 700 12px var(--font-data); letter-spacing: 0.1em; text-transform: uppercase; color: #1d1203; background: var(--amber); box-shadow: 0 6px 22px -4px rgba(255, 181, 71, 0.8); }
.c-new svg { width: 15px; height: 15px; }
.c-cc.unlocked { border-color: var(--amber); animation: unlock-glow 1.5s ease-out 3; }
.c-cc.unlocked .c-new { display: inline-flex; animation: unlock-pop 0.6s cubic-bezier(0.2, 1.4, 0.4, 1) both; }
.c-cc.unlocked .c-fr { animation: unlock-chip 1.5s ease-out 3; }
.c-cc.unlocked .c-cc-actions .btn.primary { animation: unlock-chip 1.5s ease-out 3; }
@keyframes unlock-glow { 0% { box-shadow: 0 0 0 0 rgba(255, 181, 71, 0.65); } 70% { box-shadow: 0 0 0 16px rgba(255, 181, 71, 0); } 100% { box-shadow: 0 0 0 0 rgba(255, 181, 71, 0); } }
@keyframes unlock-pop { from { opacity: 0; transform: translateY(8px) scale(0.6); } }
@keyframes unlock-chip { 0%, 100% { transform: scale(1); } 30% { transform: scale(1.07); } }
@media (prefers-reduced-motion: reduce) { .c-cc.unlocked, .c-cc.unlocked .c-new, .c-cc.unlocked .c-fr, .c-cc.unlocked .c-cc-actions .btn.primary { animation: none; } .c-cc.unlocked { box-shadow: 0 0 0 4px rgba(255, 181, 71, 0.35); } }