/* Adaptive Academy — shared styles */
:root {
  --ink: #111318;
  --ink-2: #3d4250;
  --ink-3: #6b7180;
  --line: #e6e8ee;
  --bg: #ffffff;
  --bg-soft: #f6f7fb;
  --green: #21b573;
  --green-dark: #149459;
  --orange: #ff6200;
  --orange-dark: #d14f00;
  --orange-soft: #fff0e5;
  --navy: #0b3f73;
  --blue: #0b3f73;
  --yellow: #ffc83d;
  --purple: #8b5cf6;
  --coral: #ff6b5a;
  --radius: 20px;
  --shadow: 0 1px 2px rgba(17, 19, 24, .06), 0 8px 24px rgba(17, 19, 24, .06);
  --shadow-lg: 0 2px 4px rgba(17, 19, 24, .06), 0 24px 48px rgba(17, 19, 24, .10);
  --max: 1160px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Inter", system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; }
h1, h2, h3, h4 {
  font-family: "Plus Jakarta Sans", "Inter", sans-serif;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 0 0 .5em;
}
h1 { font-size: clamp(2.6rem, 6vw, 4.6rem); font-weight: 800; }
h2 { font-size: clamp(2rem, 4vw, 3rem); font-weight: 800; }
h3 { font-size: 1.35rem; font-weight: 700; }
p { margin: 0 0 1em; }

.container { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 24px; }
.section { padding: 96px 0; }
.section--soft { background: var(--bg-soft); }
.center { text-align: center; }
.lead { font-size: 1.2rem; color: var(--ink-2); max-width: 640px; }
.center .lead { margin-left: auto; margin-right: auto; }

.eyebrow {
  display: inline-block;
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--orange-dark);
  background: var(--orange-soft);
  padding: 6px 12px;
  border-radius: 999px;
  margin-bottom: 20px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font: 600 1rem/1 "Inter", sans-serif;
  padding: 16px 26px;
  border-radius: 14px;
  border: 2px solid transparent;
  text-decoration: none;
  cursor: pointer;
  transition: transform .15s ease, box-shadow .15s ease, background .15s ease;
}
.btn:active { transform: translateY(2px); }
.btn--primary { background: var(--navy); color: #fff; box-shadow: 0 4px 0 #062544; }
.btn--primary:hover { background: #12508f; }
.btn--primary:active { box-shadow: 0 2px 0 #062544; }
.btn--accent { background: var(--orange); color: #fff; box-shadow: 0 4px 0 var(--orange-dark); }
.btn--accent:hover { background: #ff7419; }
.btn--accent:active { box-shadow: 0 2px 0 var(--orange-dark); }
.btn--ghost { background: #fff; color: var(--ink); border-color: var(--line); box-shadow: 0 4px 0 var(--line); }
.btn--ghost:hover { border-color: #cfd3dc; }
.btn--sm { padding: 11px 18px; font-size: .92rem; border-radius: 12px; }
.btn-row { display: flex; gap: 14px; flex-wrap: wrap; }
.center .btn-row { justify-content: center; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, .88);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color .2s;
}
.site-header.scrolled { border-bottom-color: var(--line); }
.nav { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.logo {
  display: flex; align-items: center; gap: 10px;
  font: 800 1.2rem "Plus Jakarta Sans", sans-serif;
  text-decoration: none; letter-spacing: -0.02em;
}
.logo { color: var(--navy); }
/* The logo file has uneven padding around its circle; crop to the circle. */
.logo-mark {
  width: 44px; height: 44px; border-radius: 50%;
  overflow: hidden; position: relative; flex: none;
}
.logo-mark img {
  position: absolute; max-width: none;
  width: 135%; left: -17%; top: -14.5%;
}
.about-logo { width: min(320px, 70vw); height: min(320px, 70vw); margin: 0 auto 32px; }
.nav-links { display: flex; align-items: center; gap: 6px; list-style: none; margin: 0; padding: 0; }
.nav-links a {
  text-decoration: none; font-weight: 500; color: var(--ink-2);
  padding: 8px 14px; border-radius: 10px; transition: background .15s, color .15s;
}
.nav-links a:hover { background: var(--bg-soft); color: var(--ink); }
.nav-links a.active { color: var(--ink); font-weight: 600; }
.nav-links a.nav-ai { color: var(--orange-dark); font-weight: 600; }
.nav-links a.nav-ai::before { content: "✦ "; }
.nav-links a.nav-ai:hover, .nav-links a.nav-ai.active { background: var(--orange-soft); color: var(--orange-dark); }
.nav-links .btn { color: #fff; margin-left: 8px; }
.nav-links .btn:hover { background: #12508f; color: #fff; }
.nav-toggle {
  display: none; background: none; border: 0; cursor: pointer;
  width: 44px; height: 44px; border-radius: 10px;
}
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--ink); margin: 5px auto; transition: transform .2s, opacity .2s; }

@media (max-width: 900px) {
  .nav-toggle { display: block; }
  .nav-links {
    position: absolute; top: 72px; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 2px;
    background: #fff; padding: 12px 16px 20px;
    border-bottom: 1px solid var(--line);
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 14px; }
  .nav-links .btn { margin: 8px 0 0; justify-content: center; }
  .nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
  .nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
}

/* Hero */
.hero { padding: 80px 0 96px; overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: 1.05fr 1fr; gap: 56px; align-items: center; }
.hero h1 .hl { position: relative; white-space: nowrap; }
.hero h1 .hl::after {
  content: ""; position: absolute; left: -4px; right: -4px; bottom: .06em; height: .28em;
  background: #ffd2b0; z-index: -1; border-radius: 6px;
}
.hero h1 { position: relative; z-index: 0; }
.hero .lead { margin-bottom: 32px; }

.subject-cloud { position: relative; height: 460px; }
.chip {
  position: absolute;
  width: 220px;
  padding: 22px;
  border-radius: var(--radius);
  background: #fff;
  border: 2px solid var(--ink);
  box-shadow: 6px 6px 0 var(--ink);
  animation: float 6s ease-in-out infinite;
  transition: transform .2s;
}
.chip:hover { animation-play-state: paused; transform: translateY(-6px) rotate(-1deg); }
.chip-symbol { font: 800 1.7rem "Plus Jakarta Sans", sans-serif; margin-bottom: 6px; }
.chip-flow { font-size: .92rem; font-weight: 600; color: var(--ink-2); }
.chip--math { background: #e8efff; top: 0; left: 4%; }
.chip--english { background: #fff4d6; top: 40px; right: 0; animation-delay: -1.5s; }
.chip--code { background: #e7f8ef; bottom: 50px; left: 0; animation-delay: -3s; }
.chip--science { background: #f1eaff; bottom: 0; right: 6%; animation-delay: -4.5s; }
.chip-dot {
  position: absolute; border-radius: 50%;
  animation: float 8s ease-in-out infinite;
}
@keyframes float {
  0%, 100% { translate: 0 0; }
  50% { translate: 0 -12px; }
}

@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; }
  .subject-cloud { height: auto; display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
  .chip { position: static; width: auto; }
  .chip-dot { display: none; }
}

/* Page hero */
.page-hero { padding: 88px 0 64px; }
.page-hero h1 { max-width: 860px; }
.page-hero.center h1 { margin-left: auto; margin-right: auto; }

/* Approach steps */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 56px; counter-reset: step; }
.step {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 32px; box-shadow: var(--shadow); position: relative;
  transition: transform .2s, box-shadow .2s;
}
.step:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.step-num {
  font: 800 .95rem "Plus Jakarta Sans", sans-serif;
  display: inline-grid; place-items: center;
  width: 48px; height: 48px; border-radius: 14px; margin-bottom: 24px;
  color: #fff;
}
.step:nth-child(1) .step-num { background: var(--blue); }
.step:nth-child(2) .step-num { background: var(--yellow); color: var(--ink); }
.step:nth-child(3) .step-num { background: var(--green); }
.step p { color: var(--ink-2); margin: 0; }
.step-arrow { position: absolute; right: -18px; top: 50%; translate: 0 -50%; font-size: 1.4rem; color: var(--ink-3); z-index: 1; }
@media (max-width: 900px) {
  .steps { grid-template-columns: 1fr; }
  .step-arrow { display: none; }
}

/* Interactive problem (Brilliant-style) */
.try-grid { display: grid; grid-template-columns: 1fr 1.1fr; gap: 56px; align-items: center; }
@media (max-width: 900px) { .try-grid { grid-template-columns: 1fr; } }
.tabs { display: inline-flex; gap: 6px; background: var(--bg-soft); padding: 6px; border-radius: 14px; margin-bottom: 20px; flex-wrap: wrap; }
.tab {
  border: 0; background: transparent; font: 600 .95rem "Inter", sans-serif;
  padding: 10px 16px; border-radius: 10px; cursor: pointer; color: var(--ink-2);
}
.tab[aria-selected="true"] { background: #fff; color: var(--ink); box-shadow: var(--shadow); }
.problem {
  background: #fff; border: 2px solid var(--ink); border-radius: 24px;
  box-shadow: 8px 8px 0 var(--ink); padding: 32px;
}
.problem-tag { font-size: .8rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 12px; }
.problem-q { font: 700 1.3rem/1.35 "Plus Jakarta Sans", sans-serif; margin-bottom: 24px; }
.problem-q code { font-family: "JetBrains Mono", ui-monospace, monospace; font-size: .95em; background: var(--bg-soft); padding: 2px 6px; border-radius: 6px; }
.options { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.option {
  font: 600 1.05rem "Inter", sans-serif; text-align: left;
  padding: 16px 18px; border-radius: 14px; cursor: pointer;
  background: #fff; border: 2px solid var(--line); box-shadow: 0 3px 0 var(--line);
  transition: border-color .15s, background .15s, transform .1s;
}
.option:hover:not(:disabled) { border-color: #b9bfcc; }
.option:active:not(:disabled) { transform: translateY(2px); }
.option.selected { border-color: var(--blue); box-shadow: 0 3px 0 var(--blue); background: #f0f4ff; }
.option.correct { border-color: var(--green); box-shadow: 0 3px 0 var(--green-dark); background: #e7f8ef; }
.option.wrong { border-color: var(--coral); box-shadow: 0 3px 0 #d94b3b; background: #fff0ee; }
.option:disabled { cursor: default; }
.problem-footer { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-top: 24px; min-height: 52px; flex-wrap: wrap; }
.feedback { font-weight: 600; margin: 0; flex: 1; }
.feedback.good { color: var(--green-dark); }
.feedback.bad { color: #d94b3b; }
.strategy-note {
  margin-top: 20px; padding: 16px 18px; border-radius: 14px;
  background: var(--bg-soft); color: var(--ink-2); font-size: .95rem; display: none;
}
.strategy-note.show { display: block; animation: pop .3s ease; }
.strategy-note strong { color: var(--ink); }
@keyframes pop { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

/* Program cards */
.filter { margin: 40px 0 32px; }
.programs { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
@media (max-width: 760px) { .programs { grid-template-columns: 1fr; } }
.program {
  border-radius: 24px; padding: 32px; border: 1px solid var(--line);
  background: #fff; box-shadow: var(--shadow);
  display: flex; flex-direction: column; gap: 14px;
  transition: transform .2s, box-shadow .2s, opacity .25s;
}
.program:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.program.hidden { display: none; }
.program-art {
  height: 150px; border-radius: 16px; display: grid; place-items: center;
  font: 800 2.4rem "Plus Jakarta Sans", sans-serif; letter-spacing: -0.03em;
  position: relative; overflow: hidden;
}
.program--math .program-art { background: #e8efff; color: var(--blue); }
.program--english .program-art { background: #fff4d6; color: #b07800; }
.program-subject { font-size: .78rem; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; color: var(--ink-3); }
.program h3 { margin: 0; }
.program p { color: var(--ink-2); margin: 0; }
.program .btn { align-self: flex-start; margin-top: auto; }

.callout {
  margin-top: 56px; padding: 28px 32px; border-radius: 20px;
  background: var(--navy); color: #fff;
  display: flex; align-items: center; justify-content: space-between; gap: 20px; flex-wrap: wrap;
}
.callout p { margin: 0; font: 700 1.25rem "Plus Jakarta Sans", sans-serif; }
.callout .btn--ghost { box-shadow: none; }

/* Subject strip */
.subject-strip { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-top: 48px; }
@media (max-width: 900px) { .subject-strip { grid-template-columns: repeat(2, 1fr); } }
.subject-tile {
  border-radius: 20px; padding: 28px 24px; text-decoration: none;
  transition: transform .2s;
  display: flex; flex-direction: column; gap: 8px; min-height: 180px;
}
.subject-tile:hover { transform: translateY(-4px) rotate(-.5deg); }
.subject-tile .sym { font: 800 2rem "Plus Jakarta Sans", sans-serif; margin-bottom: auto; }
.subject-tile h3 { margin: 0; font-size: 1.15rem; }
.subject-tile span { font-size: .9rem; color: var(--ink-2); }

/* Split / about */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: start; }
@media (max-width: 900px) { .split { grid-template-columns: 1fr; gap: 32px; } }
.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 36px; box-shadow: var(--shadow);
}
.card--accent { border: 2px solid var(--ink); box-shadow: 8px 8px 0 var(--ink); }
.card p:last-child { margin-bottom: 0; }
.big-quote { font: 700 clamp(1.5rem, 3vw, 2.1rem)/1.3 "Plus Jakarta Sans", sans-serif; letter-spacing: -0.02em; }
.contrast { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 32px; }
@media (max-width: 600px) { .contrast { grid-template-columns: 1fr; } }
.contrast-item { border-radius: 16px; padding: 24px; }
.contrast-item .sym { font: 800 1.6rem "Plus Jakarta Sans", sans-serif; margin-bottom: 6px; }
.contrast-item p { margin: 0; color: var(--ink-2); }

/* Audience cards */
.audience { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 48px; }
@media (max-width: 900px) { .audience { grid-template-columns: 1fr; } }
.audience .card { display: flex; flex-direction: column; gap: 10px; transition: transform .2s; }
.audience .card:hover { transform: translateY(-4px); }
.audience .icon {
  width: 56px; height: 56px; border-radius: 16px; display: grid; place-items: center;
  font-size: 1.6rem; margin-bottom: 10px;
}
.audience .label { font-size: .78rem; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; color: var(--ink-3); }
.audience h3 { margin: 0; }
.audience p { color: var(--ink-2); margin: 0; }

/* Contact */
.contact-card { max-width: 720px; margin: 0 auto; text-align: center; }
.email-pill {
  display: inline-flex; align-items: center; gap: 12px; flex-wrap: wrap; justify-content: center;
  margin: 24px 0 28px; padding: 12px 12px 12px 22px;
  border: 2px solid var(--line); border-radius: 16px; font-weight: 600; font-size: 1.1rem;
}
.copy-btn {
  border: 0; background: var(--bg-soft); border-radius: 10px; padding: 8px 14px;
  font: 600 .9rem "Inter", sans-serif; cursor: pointer;
}
.copy-btn:hover { background: var(--line); }

/* Team */
.coming-soon {
  max-width: 640px; margin: 0 auto; text-align: center;
  padding: 56px 32px; border-radius: 24px; border: 2px dashed #cfd3dc; background: var(--bg-soft);
}
.coming-soon .dots { display: flex; justify-content: center; gap: 10px; margin-bottom: 24px; }
.coming-soon .dots span {
  width: 14px; height: 14px; border-radius: 50%;
  animation: bounce 1.2s ease-in-out infinite;
}
.coming-soon .dots span:nth-child(1) { background: var(--blue); }
.coming-soon .dots span:nth-child(2) { background: var(--yellow); animation-delay: .15s; }
.coming-soon .dots span:nth-child(3) { background: var(--green); animation-delay: .3s; }
@keyframes bounce { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }

/* CTA band */
.cta-band {
  background: var(--navy); color: #fff; border-radius: 32px; padding: 72px 48px;
  text-align: center; position: relative; overflow: hidden;
}
.cta-band h2 { color: #fff; }
.cta-band p { color: #c3c7d1; max-width: 560px; margin: 0 auto 32px; font-size: 1.1rem; }
.cta-band .btn--ghost { box-shadow: none; border-color: transparent; }
.cta-band .shape { position: absolute; border-radius: 50%; opacity: .9; }

/* Footer */
.site-footer { border-top: 1px solid var(--line); padding: 56px 0 40px; margin-top: 96px; }
.footer-grid { display: flex; justify-content: space-between; gap: 32px; flex-wrap: wrap; }
.footer-tag { color: var(--ink-2); margin: 12px 0 0; }
.footer-links { display: flex; gap: 8px 24px; flex-wrap: wrap; list-style: none; padding: 0; margin: 0; }
.footer-links a { text-decoration: none; color: var(--ink-2); font-weight: 500; }
.footer-links a:hover { color: var(--ink); }
.footer-bottom { margin-top: 40px; padding-top: 24px; border-top: 1px solid var(--line); color: var(--ink-3); font-size: .92rem; }
.footer-bottom a { color: var(--ink-2); }

/* Reveal on scroll */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
}

/* Course pages */
.course-hero { padding: 72px 0 56px; }
.course-hero-grid { display: grid; grid-template-columns: 1.3fr 1fr; gap: 48px; align-items: center; }
@media (max-width: 900px) { .course-hero-grid { grid-template-columns: 1fr; } }
.crumbs { font-size: .92rem; color: var(--ink-3); margin-bottom: 18px; }
.crumbs a { color: var(--ink-2); text-decoration: none; }
.crumbs a:hover { text-decoration: underline; }
.course-art {
  aspect-ratio: 1.15; border-radius: 28px; display: grid; place-items: center;
  font: 800 clamp(3rem, 8vw, 5.5rem) "Plus Jakarta Sans", sans-serif; letter-spacing: -0.04em;
  border: 2px solid var(--ink); box-shadow: 8px 8px 0 var(--ink);
}
.course--math .course-art { background: #e8efff; color: var(--navy); }
.course--english .course-art { background: #fff4d6; color: #b07800; }
.facts { display: flex; flex-wrap: wrap; gap: 10px; margin: 0 0 28px; padding: 0; list-style: none; }
.facts li {
  background: var(--bg-soft); border: 1px solid var(--line); border-radius: 999px;
  padding: 8px 14px; font-weight: 600; font-size: .92rem;
}
.topics { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 20px; margin-top: 40px; }
.topic { background: #fff; border: 1px solid var(--line); border-radius: 18px; padding: 24px; box-shadow: var(--shadow); }
.topic .sym { font: 800 1.6rem "Plus Jakarta Sans", sans-serif; color: var(--orange); margin-bottom: 8px; }
.topic h3 { font-size: 1.1rem; margin-bottom: 6px; }
.topic p { margin: 0; color: var(--ink-2); font-size: .96rem; }
.method { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-top: 40px; counter-reset: m; }
@media (max-width: 900px) { .method { grid-template-columns: 1fr 1fr; } }
@media (max-width: 520px) { .method { grid-template-columns: 1fr; } }
.method li { list-style: none; background: #fff; border-radius: 18px; padding: 22px; border: 1px solid var(--line); position: relative; }
.method li::before {
  counter-increment: m; content: counter(m);
  display: inline-grid; place-items: center; width: 34px; height: 34px; border-radius: 10px;
  background: var(--navy); color: #fff; font-weight: 800; margin-bottom: 12px;
}
.method strong { display: block; margin-bottom: 4px; }
.method span { color: var(--ink-2); font-size: .95rem; }
.method ol, ol.method { padding: 0; }
.practice { display: grid; gap: 28px; margin-top: 40px; }
.practice .problem { box-shadow: 6px 6px 0 var(--ink); }
.problem-tools { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 16px; }
.link-btn {
  background: none; border: 0; padding: 6px 0; cursor: pointer;
  font: 600 .95rem "Inter", sans-serif; color: var(--navy); text-decoration: underline; text-underline-offset: 3px;
}
.link-btn + .link-btn { margin-left: 14px; }
.hint {
  display: none; margin-top: 12px; padding: 14px 16px; border-radius: 12px;
  background: #fff8e1; color: var(--ink-2); font-size: .95rem;
}
.hint.show { display: block; animation: pop .3s ease; }
.tutor-promo {
  display: grid; grid-template-columns: auto 1fr auto; gap: 24px; align-items: center;
  padding: 28px 32px; border-radius: 24px; background: var(--orange-soft); border: 2px solid var(--orange);
}
.tutor-promo .spark { font-size: 2rem; color: var(--orange); }
.tutor-promo h3 { margin: 0 0 4px; }
.tutor-promo p { margin: 0; color: var(--ink-2); }
@media (max-width: 700px) { .tutor-promo { grid-template-columns: 1fr; text-align: left; } }
.program .btn-row { margin-top: auto; }

/* AI tutor widget */
.tutor { position: fixed; right: 20px; bottom: 20px; z-index: 100; font-size: .97rem; }
.tutor-launch {
  display: flex; align-items: center; gap: 10px;
  background: var(--navy); color: #fff; border: 0; cursor: pointer;
  font: 600 1rem "Inter", sans-serif; padding: 14px 20px; border-radius: 999px;
  box-shadow: 0 4px 0 #062544, var(--shadow-lg);
  transition: transform .15s;
}
.tutor-launch:hover { transform: translateY(-2px); }
.tutor-launch-icon { color: var(--orange); font-size: 1.2rem; }
.tutor.open .tutor-launch { display: none; }
.tutor-panel {
  width: min(400px, calc(100vw - 32px)); height: min(620px, calc(100vh - 40px));
  background: #fff; border-radius: 22px; border: 2px solid var(--ink);
  box-shadow: 8px 8px 0 var(--ink); display: flex; flex-direction: column; overflow: hidden;
  animation: pop .2s ease;
}
.tutor-panel[hidden] { display: none; }
.tutor-head {
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
  padding: 16px 18px; background: var(--tutor-color, var(--navy)); color: #fff;
}
.tutor-head strong { display: block; font: 700 1.05rem "Plus Jakarta Sans", sans-serif; }
.tutor-head span { font-size: .85rem; opacity: .85; }
.tutor-head-actions { display: flex; gap: 6px; }
.tutor-icon-btn {
  width: 34px; height: 34px; border-radius: 10px; border: 0; cursor: pointer;
  background: rgba(255, 255, 255, .15); color: #fff; font-size: 1rem;
}
.tutor-icon-btn:hover { background: rgba(255, 255, 255, .28); }
.tutor-log { flex: 1; overflow-y: auto; padding: 18px; display: flex; flex-direction: column; gap: 12px; background: var(--bg-soft); }
.tutor-msg { max-width: 88%; padding: 12px 14px; border-radius: 16px; line-height: 1.5; overflow-wrap: anywhere; }
.tutor-msg p { margin: 0 0 .6em; }
.tutor-msg p:last-child, .tutor-msg ul:last-child { margin-bottom: 0; }
.tutor-msg ul { margin: 0 0 .6em; padding-left: 1.2em; }
.tutor-msg code { font-family: "JetBrains Mono", ui-monospace, monospace; font-size: .9em; background: rgba(17, 19, 24, .07); padding: 1px 5px; border-radius: 5px; }
.tutor-msg--assistant { align-self: flex-start; background: #fff; border: 1px solid var(--line); border-bottom-left-radius: 6px; }
.tutor-msg--user { align-self: flex-end; background: var(--navy); color: #fff; border-bottom-right-radius: 6px; }
.tutor-msg--error { border-color: #f3b5ad; background: #fff0ee; }
.tutor-msg.typing::after { content: "● ● ●"; letter-spacing: 2px; color: var(--ink-3); animation: blink 1s infinite; }
@keyframes blink { 50% { opacity: .3; } }
.tutor-suggest { display: flex; flex-wrap: wrap; gap: 8px; padding: 0 18px; background: var(--bg-soft); }
.tutor-suggest:not(:empty) { padding-bottom: 12px; }
.tutor-chip {
  border: 1px solid var(--line); background: #fff; border-radius: 999px; cursor: pointer;
  padding: 7px 12px; font: 500 .86rem "Inter", sans-serif; color: var(--ink-2); text-align: left;
}
.tutor-chip:hover { border-color: var(--orange); color: var(--ink); }
.tutor-chip--quiz { border: 2px solid var(--navy); color: var(--navy); font-weight: 600; padding: 8px 14px; }
.tutor-chip--quiz:hover { background: var(--navy); border-color: var(--navy); color: #fff; }
.tutor-form { display: flex; gap: 8px; padding: 12px; border-top: 1px solid var(--line); align-items: flex-end; }
.tutor-form textarea {
  flex: 1; resize: none; border: 2px solid var(--line); border-radius: 14px; padding: 10px 12px;
  font: 400 1rem/1.4 "Inter", sans-serif; max-height: 140px;
}
.tutor-form textarea:focus { outline: none; border-color: var(--navy); }
.tutor-send {
  width: 44px; height: 44px; border-radius: 12px; border: 0; cursor: pointer; flex: none;
  background: var(--orange); color: #fff; font-size: 1.2rem; font-weight: 700;
  box-shadow: 0 3px 0 var(--orange-dark);
}
.tutor-send:disabled { opacity: .5; cursor: default; }
.tutor-note { margin: 0; padding: 0 12px 10px; font-size: .75rem; color: var(--ink-3); text-align: center; }
/* Full screen chat */
body.tutor-full { overflow: hidden; }
.tutor.full.open { inset: 0; }
.tutor.full .tutor-panel {
  width: 100%; height: 100%; border: 0; border-radius: 0; box-shadow: none; animation: none;
}
.tutor.full .tutor-log,
.tutor.full .tutor-suggest,
.tutor.full .tutor-form { padding-left: max(18px, calc((100% - 800px) / 2)); padding-right: max(18px, calc((100% - 800px) / 2)); }
.tutor.full .tutor-note { padding-bottom: 14px; }
@media (max-width: 520px) {
  .tutor { right: 12px; bottom: 12px; left: 12px; display: flex; justify-content: flex-end; }
  .tutor-panel { width: 100%; height: calc(100vh - 24px); }
}

/* Learn with AI page */
.ai-hero { padding: 64px 0 24px; }
.ai-hero h1 { font-size: clamp(2.2rem, 5vw, 3.6rem); }
.ai-tabs { display: flex; justify-content: center; }
.ai-tabs .tabs { margin-bottom: 24px; }
.ai-tabs .tab { font-size: 1.05rem; padding: 12px 22px; }
.ai-chat { max-width: 880px; margin: 0 auto; }
.tutor--embed { position: static; font-size: 1rem; }
.tutor--embed .tutor-panel { width: 100%; height: min(680px, calc(100vh - 140px)); min-height: 460px; animation: none; }
.tutor--embed.full { position: fixed; inset: 0; z-index: 100; }
.tutor--embed.full .tutor-panel { min-height: 0; }
.ai-tips { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; max-width: 880px; margin: 40px auto 0; }
.ai-tips .card { padding: 22px; }
.ai-tips h3 { font-size: 1.1rem; margin-bottom: .4em; }
.ai-tips p { margin: 0; color: var(--ink-2); font-size: .95rem; }
@media (max-width: 760px) { .ai-tips { grid-template-columns: 1fr; } }
@media (max-width: 520px) { .tutor--embed .tutor-panel { height: calc(100vh - 120px); } }