@import url('../assets/styles.css');

:root { --topic: #7758e8; --topic-dark: #5238b5; --topic-soft: #eee9ff; }
body[data-topic="chemistry"] { --topic: #16a77d; --topic-dark: #087154; --topic-soft: #e2f7ef; }
body[data-topic="physics"] { --topic: #e77932; --topic-dark: #a94b13; --topic-soft: #fff0df; }
body[data-topic="biology"] { --topic: #288bd6; --topic-dark: #11639f; --topic-soft: #e4f3ff; }
body[data-topic="astronomy"] { --topic: #c75691; --topic-dark: #89305f; --topic-soft: #fce7f2; }
body[data-topic="internet"] { --topic: #1477c9; --topic-dark: #07508c; --topic-soft: #e3f3ff; }
body[data-topic="ai"] { --topic: #7a4dd8; --topic-dark: #4f2b9d; --topic-soft: #eee7ff; }
body[data-topic="sports"] { --topic: #e45f2b; --topic-dark: #9f3512; --topic-soft: #fff0e7; }

.academy-nav { margin-bottom: 0; }
.academy-nav .nav-links a.active { color: var(--topic-dark); background: var(--topic-soft); }
.topic-hero {
  width: min(1160px, calc(100% - 32px)); margin: 24px auto; padding: clamp(30px, 6vw, 64px);
  display: grid; grid-template-columns: 1.1fr .9fr; align-items: center; gap: 38px;
  overflow: hidden; position: relative; border: 1px solid rgba(255,255,255,.9); border-radius: 36px;
  background: radial-gradient(circle at 90% 0%, color-mix(in srgb, var(--topic) 22%, transparent), transparent 25rem), rgba(255,255,255,.9);
  box-shadow: var(--shadow);
}
.topic-hero::after {
  content: ""; width: 260px; height: 260px; position: absolute; right: -120px; bottom: -150px;
  border: 36px solid color-mix(in srgb, var(--topic) 12%, transparent); border-radius: 50%;
}
.topic-kicker { margin: 0 0 12px; color: var(--topic-dark); font-size: .82rem; font-weight: 900; letter-spacing: .08em; text-transform: uppercase; }
.topic-hero h1 { margin: 0; font-size: clamp(3rem, 7vw, 5.8rem); line-height: .94; letter-spacing: -.055em; }
.topic-hero p:not(.topic-kicker) { max-width: 650px; margin: 20px 0 0; color: var(--muted); font-size: 1.12rem; line-height: 1.7; }
.topic-icon { min-height: 280px; display: grid; place-items: center; position: relative; z-index: 1; }
.topic-icon > div {
  width: 210px; height: 210px; display: grid; place-items: center; border-radius: 42% 58% 55% 45%;
  color: #fff; background: linear-gradient(145deg, var(--topic), var(--topic-dark));
  box-shadow: 0 25px 50px color-mix(in srgb, var(--topic) 28%, transparent); font-size: 6rem; animation: float 4s ease-in-out infinite;
}
.topic-main { width: min(1060px, calc(100% - 32px)); margin: 0 auto 80px; }
.lesson-section { margin: 62px 0; scroll-margin-top: 20px; }
.lesson-heading { margin-bottom: 22px; }
.lesson-heading .number {
  width: 38px; height: 38px; display: inline-grid; place-items: center; color: #fff;
  border-radius: 12px; background: var(--topic); font-weight: 900;
}
.lesson-heading h2 { margin: 12px 0 6px; font-size: clamp(2rem, 5vw, 3.25rem); line-height: 1; letter-spacing: -.04em; }
.lesson-heading p { max-width: 760px; margin: 0; color: var(--muted); font-size: 1.05rem; line-height: 1.65; }
.concept-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.concept-card {
  min-height: 220px; padding: 24px; border: 1px solid rgba(255,255,255,.9);
  border-radius: 24px; background: rgba(255,255,255,.9); box-shadow: var(--shadow-sm);
}
.concept-card .icon { display: block; margin: 0 0 20px !important; font-size: 2.3rem; }
.concept-card h3 { margin: 0 0 8px; font-size: 1.45rem; line-height: 1.1; }
.concept-card p { margin: 0; color: var(--muted); line-height: 1.6; }
.big-idea {
  padding: clamp(26px, 5vw, 46px); display: grid; grid-template-columns: 1fr 1fr; gap: 30px; align-items: center;
  border: 1px solid color-mix(in srgb, var(--topic) 22%, white); border-radius: 30px; background: var(--topic-soft);
}
.big-idea h2, .big-idea h3 { margin-top: 0; }
.big-idea p { color: var(--muted); line-height: 1.65; }
.formula {
  padding: 18px; color: var(--topic-dark); border: 2px dashed color-mix(in srgb, var(--topic) 35%, white);
  border-radius: 18px; background: rgba(255,255,255,.74); font: 800 clamp(1.35rem, 4vw, 2.25rem) "Baloo 2", sans-serif; text-align: center;
}
.tiny-note { color: var(--muted); font-size: .9rem; line-height: 1.5; }
.formula-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.formula-card {
  padding: 20px; display: grid; grid-template-columns: minmax(150px, .8fr) 1.2fr; gap: 18px; align-items: center;
  border: 1px solid var(--line); border-radius: 20px; background: #fff; box-shadow: var(--shadow-sm);
}
.formula-card code { padding: 12px; color: var(--topic-dark); border-radius: 12px; background: var(--topic-soft); font: 800 1.12rem "Nunito", sans-serif; text-align: center; }
.formula-card h3 { margin: 0 0 4px; font-size: 1.05rem; }
.formula-card p { margin: 0; color: var(--muted); font-size: .9rem; line-height: 1.45; }
.experiment {
  padding: clamp(24px, 5vw, 42px); border: 1px solid rgba(255,255,255,.9);
  border-radius: 30px; background: rgba(255,255,255,.93); box-shadow: var(--shadow);
}
.experiment h3 { margin: 0 0 4px; font-size: 1.8rem; }
.experiment > p { margin: 0 0 22px; color: var(--muted); }
.control-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.control-row label { padding: 14px; border-radius: 16px; background: #f8f7fc; font-weight: 800; }
.control-row input[type="range"] { width: 100%; accent-color: var(--topic); }
.area-model {
  width: min(460px, 100%); aspect-ratio: 1; margin: 26px auto 16px; display: grid;
  grid-template-columns: var(--a, 60%) var(--b, 40%); grid-template-rows: var(--a, 60%) var(--b, 40%);
  overflow: hidden; color: #fff; border: 6px solid var(--ink); border-radius: 20px; box-shadow: var(--shadow-sm);
}
.area-model div { display: grid; place-items: center; padding: 6px; font-weight: 900; text-align: center; }
.area-a2 { background: #7758e8; } .area-ab1 { background: #f06aa7; } .area-ab2 { background: #ff8a55; } .area-b2 { background: #29b889; }
.equation-result { text-align: center; color: var(--topic-dark); font: 800 1.25rem "Baloo 2", sans-serif; }
.element-board { display: grid; grid-template-columns: repeat(10, 1fr); gap: 7px; }
.element {
  min-width: 0; aspect-ratio: 1; padding: 4px !important; display: grid; place-items: center; color: var(--ink) !important;
  border: 1px solid #bce6d8 !important; border-radius: 10px !important; background: #effaf6 !important;
  box-shadow: none !important; font: 900 clamp(.7rem, 2vw, 1rem) "Nunito", sans-serif !important;
}
.element:hover, .element.active { color: #fff !important; background: var(--topic) !important; transform: translateY(-2px); }
.element-info { margin-top: 16px; padding: 22px; border-radius: 18px; background: var(--topic-soft); }
.element-info h3 { margin: 0 0 4px; } .element-info p { margin: 0; color: var(--muted); }
.compound-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.compound { padding: 22px; border: 1px solid var(--line); border-radius: 20px; background: #fff; }
.compound strong { display: block; margin-bottom: 8px; color: var(--topic-dark); font: 800 1.5rem "Baloo 2", sans-serif; }
.compound span { display: block; color: var(--muted); line-height: 1.5; }
.law-stack { display: grid; gap: 16px; }
.law-card {
  padding: 24px; display: grid; grid-template-columns: 120px 1fr; gap: 24px; align-items: center;
  border: 1px solid var(--line); border-radius: 24px; background: #fff; box-shadow: var(--shadow-sm);
}
.law-card h3 { margin: 0 0 6px; font-size: 1.45rem; } .law-card p { margin: 0; color: var(--muted); line-height: 1.55; }
.law-demo { height: 95px; overflow: hidden; position: relative; border-radius: 16px; background: var(--topic-soft); }
.law-demo::after { content: ""; position: absolute; left: 8px; right: 8px; bottom: 15px; height: 4px; border-radius: 4px; background: #b7a58f; }
.inertia-ball {
  width: 28px; height: 28px; position: absolute; left: 15px; bottom: 19px; z-index: 1;
  border-radius: 50%; background: var(--topic); animation: roll 3.4s ease-in-out infinite;
}
@keyframes roll { 0%,15% { transform: translateX(0) rotate(0); } 70%,100% { transform: translateX(65px) rotate(540deg); } }
.force-cart {
  width: 48px; height: 30px; position: absolute; left: 13px; bottom: 22px; z-index: 1;
  border-radius: 7px; background: var(--topic); animation: cartPush 2.8s ease-in-out infinite;
}
.force-cart::before, .force-cart::after { content: ""; width: 11px; height: 11px; position: absolute; bottom: -8px; border-radius: 50%; background: var(--ink); }
.force-cart::before { left: 6px; } .force-cart::after { right: 6px; }
@keyframes cartPush { 0%,15% { transform: translateX(0); } 75%,100% { transform: translateX(58px); } }
.rocket-body { position: absolute; left: 46px; bottom: 18px; z-index: 1; font-size: 2.9rem; animation: launch 2.6s ease-in-out infinite; }
@keyframes launch { 0%,15% { transform: translateY(0); } 70%,100% { transform: translateY(-48px); } }
.meter-result { margin-top: 20px; padding: 18px; display: flex; align-items: center; justify-content: space-between; border-radius: 18px; background: var(--topic-soft); }
.meter-result strong { color: var(--topic-dark); font: 800 2rem "Baloo 2", sans-serif; }
.demo-track { height: 78px; margin-top: 18px; overflow: hidden; position: relative; border-radius: 16px; background: #f6f2ee; border-bottom: 5px solid #ac9b88; }
.demo-cart { width: 64px; height: 38px; position: absolute; left: 14px; bottom: 8px; border-radius: 8px; background: var(--topic); animation: liveCart var(--travel-time, 2s) ease-in infinite; }
.demo-cart::after { content: "▣"; color: #fff; display: grid; place-items: center; height: 100%; }
@keyframes liveCart { from { transform: translateX(0); } to { transform: translateX(min(700px, 75vw)); } }
.cell-model {
  min-height: 380px; padding: 40px; display: grid; place-items: center; border-radius: 38% 62% 55% 45%;
  background: #9edaff; border: 8px solid #3d9cdc; box-shadow: inset 0 0 0 16px rgba(255,255,255,.25), var(--shadow);
}
.cell-parts { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; }
.cell-part { padding: 16px; border-radius: 50%; background: #fff; box-shadow: var(--shadow-sm); text-align: center; }
.dna-ladder { max-width: 520px; margin: 20px auto; display: grid; gap: 8px; }
.dna-rung { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; position: relative; }
.dna-rung::after { content: ""; height: 4px; position: absolute; left: 44%; right: 44%; top: 50%; background: #9cb3c8; }
.dna-rung span { padding: 9px; color: #fff; border-radius: 12px; background: var(--topic); font-weight: 900; text-align: center; }
.dna-rung span:last-child { background: var(--pink); }
.planet-line { display: flex; align-items: end; gap: clamp(8px, 2vw, 24px); overflow-x: auto; padding: 30px 10px 20px; }
.planet { min-width: 62px; text-align: center; }
.planet span { width: var(--size); height: var(--size); margin: 0 auto 10px; display: block; border-radius: 50%; background: var(--color); box-shadow: inset -8px -6px rgba(0,0,0,.12); }
.planet strong { font-size: .78rem; }
.compact-grid { margin-top: 16px; }
.url-breakdown { margin: 22px 0; display: grid; grid-template-columns: repeat(4, 1fr); overflow: hidden; border: 1px solid var(--line); border-radius: 22px; background: #fff; box-shadow: var(--shadow-sm); }
.url-breakdown div { min-width: 0; padding: 22px 16px; border-right: 1px solid var(--line); }
.url-breakdown div:last-child { border-right: 0; }
.url-breakdown strong { display: block; overflow-wrap: anywhere; color: var(--topic-dark); font: 800 1.1rem "Baloo 2", sans-serif; }
.url-breakdown span { display: block; margin-top: 5px; color: var(--muted); font-size: .88rem; line-height: 1.45; }
.journey-list { margin: 0; padding: 0; display: grid; gap: 12px; list-style: none; counter-reset: none; }
.journey-list li { padding: 20px 22px; display: grid; grid-template-columns: 48px 1fr; gap: 16px; align-items: center; border: 1px solid var(--line); border-radius: 20px; background: #fff; box-shadow: var(--shadow-sm); }
.journey-list li > span { width: 44px; height: 44px; display: grid; place-items: center; color: #fff; border-radius: 50%; background: var(--topic); font-weight: 900; }
.journey-list h3 { margin: 0 0 4px; }
.journey-list p { margin: 0; color: var(--muted); line-height: 1.55; }
.comparison-table { overflow: hidden; border: 1px solid var(--line); border-radius: 22px; background: #fff; box-shadow: var(--shadow-sm); }
.comparison-row { padding: 17px 20px; display: grid; grid-template-columns: .7fr 1.6fr 1fr; gap: 18px; align-items: center; border-bottom: 1px solid var(--line); }
.comparison-row:last-child { border-bottom: 0; }
.comparison-row span { color: var(--muted); line-height: 1.5; }
.comparison-head { color: #fff; background: var(--topic); }
.glossary-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 13px; }
.glossary-grid article { padding: 20px; border: 1px solid var(--line); border-radius: 18px; background: #fff; }
.glossary-grid strong { color: var(--topic-dark); font-size: 1.08rem; }
.glossary-grid p { margin: 5px 0 0; color: var(--muted); line-height: 1.55; }
.safety-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 13px; }
.safety-list article { padding: 22px; border-left: 6px solid var(--topic); border-radius: 8px 18px 18px 8px; background: #fff; box-shadow: var(--shadow-sm); }
.safety-list strong { font-size: 1.1rem; }
.safety-list p { margin: 5px 0 0; color: var(--muted); line-height: 1.55; }
.quiz-stack { display: grid; gap: 10px; }
.quiz-stack details { padding: 17px 20px; border: 1px solid var(--line); border-radius: 16px; background: #fff; box-shadow: var(--shadow-sm); }
.quiz-stack summary { cursor: pointer; color: var(--topic-dark); font-weight: 900; }
.quiz-stack p { margin: 12px 0 0; color: var(--muted); line-height: 1.6; }
.wonder-banner { margin-top: 64px; padding: 34px; color: #fff; border-radius: 28px; background: linear-gradient(135deg, var(--topic), var(--topic-dark)); box-shadow: var(--shadow); text-align: center; }
.wonder-banner h2 { margin: 0 0 8px; font-size: 2rem; }
.wonder-banner p { max-width: 700px; margin: 0 auto 18px; color: rgba(255,255,255,.82); line-height: 1.6; }
.wonder-banner a { display: inline-block; padding: 11px 16px; color: var(--ink); border-radius: 13px; background: #fff; text-decoration: none; font-weight: 900; }
.academy-hub-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.academy-hub-card {
  min-height: 280px; padding: 30px; display: flex; flex-direction: column; color: var(--ink); text-decoration: none;
  border: 1px solid rgba(255,255,255,.9); border-radius: 28px; background: #fff; box-shadow: var(--shadow-sm); transition: transform .2s;
}
.academy-hub-card:hover { transform: translateY(-6px); }
.academy-hub-card span { font-size: 3.2rem; }
.academy-hub-card h2 { margin: auto 0 6px; font-size: 2rem; }
.academy-hub-card p { margin: 0 0 14px; color: var(--muted); line-height: 1.55; }
.academy-hub-card strong { color: var(--purple-dark); }
.sports-directory { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.sports-directory a {
  min-height: 135px; padding: 18px; display: flex; flex-direction: column; color: var(--ink); text-decoration: none;
  border: 1px solid rgba(255,255,255,.9); border-radius: 20px; background: #fff; box-shadow: var(--shadow-sm); transition: transform .18s, border-color .18s;
}
.sports-directory a:hover { transform: translateY(-4px); border-color: color-mix(in srgb, var(--topic) 45%, white); }
.sports-directory span { font-size: 2rem; }
.sports-directory strong { margin-top: auto; font-size: 1.05rem; }
.sports-directory small { color: var(--muted); }
.sport-guide-grid { display: grid; gap: 22px; }
.sport-guide {
  padding: clamp(24px, 5vw, 38px); scroll-margin-top: 100px; border: 1px solid rgba(255,255,255,.92);
  border-radius: 28px; background: rgba(255,255,255,.94); box-shadow: var(--shadow-sm);
}
.sport-guide header { display: flex; gap: 16px; align-items: center; }
.sport-guide header > span { width: 70px; height: 70px; display: grid; place-items: center; flex: 0 0 auto; border-radius: 20px; background: var(--topic-soft); font-size: 2.5rem; }
.sport-guide header h2 { margin: 0; font-size: clamp(1.8rem, 4vw, 2.45rem); }
.sport-guide header .topic-kicker { margin-bottom: 2px; }
.sport-goal { margin: 20px 0; padding: 15px 18px; color: var(--topic-dark); border-left: 5px solid var(--topic); border-radius: 6px 15px 15px 6px; background: var(--topic-soft); line-height: 1.6; }
.sport-facts { margin: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.sport-facts div { padding: 16px; border: 1px solid var(--line); border-radius: 16px; background: #fafafa; }
.sport-facts dt { color: var(--topic-dark); font-weight: 900; }
.sport-facts dd { margin: 4px 0 0; color: var(--muted); line-height: 1.52; }
.skill-strip { margin-top: 16px; display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.skill-strip strong { margin-right: 4px; }
.skill-strip span { padding: 7px 10px; color: var(--topic-dark); border-radius: 999px; background: var(--topic-soft); font-size: .87rem; font-weight: 800; }
.try-it { margin: 18px 0 0; color: var(--muted); line-height: 1.58; }
.fair-play-code { padding: 24px; display: grid; gap: 6px; border: 2px dashed color-mix(in srgb, var(--topic) 40%, white); border-radius: 20px; background: rgba(255,255,255,.72); color: var(--muted); line-height: 1.5; }
.fair-play-code strong { color: var(--topic-dark); }
@media (max-width: 820px) {
  .topic-hero { grid-template-columns: 1fr; } .topic-icon { min-height: 220px; }
  .topic-icon > div { width: 170px; height: 170px; font-size: 5rem; }
  .concept-grid { grid-template-columns: 1fr; } .compound-grid { grid-template-columns: repeat(2, 1fr); }
  .big-idea { grid-template-columns: 1fr; } .formula-grid { grid-template-columns: 1fr; }
  .element-board { grid-template-columns: repeat(5, 1fr); }
  .url-breakdown { grid-template-columns: repeat(2, 1fr); }
  .url-breakdown div:nth-child(2) { border-right: 0; }
  .url-breakdown div { border-bottom: 1px solid var(--line); }
  .url-breakdown div:nth-last-child(-n+2) { border-bottom: 0; }
  .comparison-row { grid-template-columns: .7fr 1.3fr 1fr; }
  .sports-directory { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 620px) {
  .academy-nav .nav-links a:not(.nav-pill) { display: none; }
  .topic-hero { padding: 30px 24px; } .topic-icon { min-height: 170px; }
  .topic-icon > div { width: 135px; height: 135px; font-size: 4rem; }
  .lesson-section { margin: 44px 0; } .control-row { grid-template-columns: 1fr; }
  .formula-card { grid-template-columns: 1fr; } .compound-grid { grid-template-columns: 1fr; }
  .law-card { grid-template-columns: 90px 1fr; padding: 18px; gap: 14px; }
  .element-board { gap: 5px; } .academy-hub-grid { grid-template-columns: 1fr; }
  .url-breakdown, .glossary-grid, .safety-list { grid-template-columns: 1fr; }
  .url-breakdown div, .url-breakdown div:nth-child(2), .url-breakdown div:nth-last-child(-n+2) { border-right: 0; border-bottom: 1px solid var(--line); }
  .url-breakdown div:last-child { border-bottom: 0; }
  .comparison-head { display: none; }
  .comparison-row { grid-template-columns: 1fr; gap: 5px; }
  .journey-list li { grid-template-columns: 40px 1fr; padding: 17px; }
  .journey-list li > span { width: 38px; height: 38px; }
  .sports-directory { grid-template-columns: repeat(2, 1fr); }
  .sport-facts { grid-template-columns: 1fr; }
  .sport-guide header > span { width: 58px; height: 58px; font-size: 2rem; }
}