/* =========================================================
   AE Studio × Eduba
   Brand tokens (from brand-pack.json) — dark mode
   ========================================================= */
:root {
  --c-primary: #3D7BFF;
  --c-secondary: #0E0F14;
  --c-accent: #9BD8FF;
  --c-navy: #0E0F14;
  --c-surface: #161821;
  --c-surface-alt: #1E202C;
  --c-bg: #0E0F14;
  --c-text: #D6D9DE;
  --c-text-mute: #8B93A1;
  --c-heading: #FFFFFF;
  --c-rule: #2A2D3A;
  --c-rule-soft: #1E202C;

  --r-sm: 4px;
  --r-md: 8px;
  --r-lg: 12px;

  --s-unit: 8px;
  --s-section: 80px;

  --shadow-subtle: 0 1px 2px rgba(0, 0, 0, 0.35);
  --shadow-medium: 0 6px 20px rgba(0, 0, 0, 0.55);

  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
  --font-head: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', Menlo, Monaco, Consolas, monospace;

  --wrap-max: 1120px;
}

*, *::before, *::after { box-sizing: border-box; }
body { margin: 0; font-family: var(--font-body); font-size: 16px; line-height: 1.65; color: var(--c-text); background: var(--c-bg); -webkit-font-smoothing: antialiased; }
img { max-width: 100%; display: block; }
a { color: var(--c-primary); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3, h4 { font-family: var(--font-head); color: var(--c-heading); font-weight: 600; letter-spacing: -0.02em; margin: 0; }
p { margin: 0 0 1em; }
.wrap { max-width: var(--wrap-max); margin: 0 auto; padding: 0 24px; }

.masthead { background: #000000; color: #fff; border-bottom: 1px solid var(--c-rule); }
.masthead__inner { max-width: var(--wrap-max); margin: 0 auto; padding: 22px 24px 20px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.masthead__logo img { height: 30px; width: auto; }
.masthead__meta { display: flex; flex-direction: column; align-items: flex-end; text-align: right; gap: 2px; }
.masthead__kicker { font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase; color: rgba(255,255,255,0.45); font-weight: 600; }
.masthead__for { font-size: 14px; color: rgba(255,255,255,0.88); font-weight: 500; }
.masthead__rule { height: 2px; background: var(--c-primary); opacity: 0.4; }

.hero { padding: 80px 0 48px; }
.eyebrow { display: inline-flex; align-items: center; gap: 10px; font-size: 12px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--c-text-mute); font-weight: 600; padding: 6px 14px 6px 10px; border: 1px solid var(--c-rule); border-radius: var(--r-sm); background: var(--c-surface); }
.eyebrow__dot { width: 8px; height: 8px; background: var(--c-primary); border-radius: 50%; display: inline-block; }
.eyebrow__sep { color: var(--c-rule); }

h1#headline { margin: 28px 0 24px; font-size: clamp(32px, 5vw, 52px); line-height: 1.12; font-weight: 600; color: var(--c-heading); max-width: 900px; letter-spacing: -0.02em; }
.headline__turn { display: block; color: var(--c-text-mute); font-weight: 400; margin-top: 8px; }
.hero__standfirst { max-width: 760px; font-size: 18px; line-height: 1.65; color: var(--c-text); margin: 0; }

.statbar { border-top: 1px solid var(--c-rule); border-bottom: 1px solid var(--c-rule); background: var(--c-surface); margin-top: 48px; }
.statbar__grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; }
.stat { padding: 28px 20px; border-right: 1px solid var(--c-rule); background: var(--c-bg); position: relative; }
.stat:last-child { border-right: 0; }
.stat::before { content: ""; position: absolute; top: 0; left: 0; right: 0; height: 2px; background: var(--c-primary); opacity: 0; transition: opacity 160ms ease; }
.stat:hover::before { opacity: 1; }
.stat__num { font-size: 26px; font-weight: 600; color: var(--c-heading); line-height: 1.1; letter-spacing: -0.02em; }
.stat__label { font-size: 13px; color: var(--c-text-mute); margin-top: 6px; line-height: 1.4; }

section.frame, section.case, section.paper, section.cred, section.cta { padding: var(--s-section) 0; border-bottom: 1px solid var(--c-rule-soft); }
section.cta { border-bottom: 0; }

.section-label { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase; color: var(--c-primary); font-weight: 500; margin-bottom: 18px; display: inline-block; padding-left: 14px; position: relative; }
.section-label::before { content: ""; position: absolute; left: 0; top: 50%; width: 8px; height: 1px; background: var(--c-primary); }
.section-label--light { color: rgba(255,255,255,0.85); }
.section-label--light::before { background: rgba(255,255,255,0.85); }

.h2 { font-size: clamp(24px, 3.2vw, 34px); line-height: 1.22; font-weight: 600; color: var(--c-heading); max-width: 820px; margin-bottom: 18px; letter-spacing: -0.02em; }
.lede { font-size: 17px; line-height: 1.65; max-width: 760px; color: var(--c-text); margin-bottom: 32px; }

.split { display: grid; grid-template-columns: 1.25fr 1fr; gap: 48px; align-items: start; margin-top: 16px; }
.split__text p { font-size: 16px; line-height: 1.7; }

.layermap { border: 1px solid var(--c-rule); border-top: 2px solid var(--c-primary); border-radius: var(--r-lg); background: var(--c-surface); padding: 24px; box-shadow: var(--shadow-subtle); }
.layermap__head { display: flex; flex-direction: column; gap: 2px; margin-bottom: 18px; padding-bottom: 14px; border-bottom: 1px dashed var(--c-rule); }
.layermap__head > span:first-child { font-family: var(--font-mono); font-weight: 500; color: var(--c-heading); font-size: 18px; letter-spacing: 0.02em; }
.layermap__subhead { font-size: 12px; color: var(--c-text-mute); text-transform: uppercase; letter-spacing: 0.1em; }
.layermap__list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 14px; }
.layermap__band { display: flex; align-items: baseline; gap: 10px; padding: 8px 12px; border-radius: var(--r-sm); background: var(--c-surface-alt); border-left: 3px solid var(--c-primary); }
.layermap__band > span { font-family: var(--font-mono); font-weight: 500; font-size: 15px; color: var(--c-heading); min-width: 44px; }
.layermap__band em { font-style: normal; font-weight: 500; color: var(--c-text-mute); font-size: 13px; letter-spacing: 0.04em; text-transform: uppercase; }
.layermap__band--60 { border-left-color: #3A5578; }
.layermap__band--30 { border-left-color: var(--c-accent); }
.layermap__band--10 { border-left-color: var(--c-primary); }
.layermap__note { font-size: 13.5px; color: var(--c-text); padding: 0 4px 4px 14px; line-height: 1.5; }

.case__card { border: 1px solid var(--c-rule); border-top: 2px solid var(--c-primary); background: var(--c-surface); border-radius: var(--r-lg); padding: 32px; box-shadow: var(--shadow-subtle); }
.case__meta { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; font-size: 13px; color: var(--c-text-mute); margin-bottom: 16px; }
.case__tag { background: var(--c-primary); color: var(--c-bg); font-weight: 600; padding: 4px 10px; border-radius: var(--r-sm); letter-spacing: 0.04em; font-size: 12px; text-transform: uppercase; }
.case__rule { width: 18px; height: 1px; background: var(--c-rule); }
.case__meta-item { font-weight: 500; }
.case__body { font-size: 17px; line-height: 1.65; color: var(--c-text); max-width: 820px; margin-bottom: 28px; }
.case__translate { border-top: 1px solid var(--c-rule); padding-top: 20px; }
.case__translate-head { font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase; color: var(--c-text-mute); font-weight: 600; margin-bottom: 14px; font-family: var(--font-mono); }
.translate-list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 10px; }
.translate-list li { display: grid; grid-template-columns: 1fr auto 1.25fr; align-items: center; gap: 16px; padding: 12px 0; border-bottom: 1px dashed var(--c-rule); font-size: 15px; }
.translate-list li:last-child { border-bottom: 0; }
.translate-list__from { color: var(--c-text-mute); font-weight: 500; }
.translate-list__arrow { color: var(--c-primary); font-weight: 600; font-size: 18px; }
.translate-list__to { color: var(--c-heading); font-weight: 600; }

.paper__grid { display: grid; grid-template-columns: 1.4fr 1fr; gap: 48px; align-items: center; margin-top: 8px; }
.paper__body p { font-size: 16.5px; line-height: 1.7; }
.paper__body p em { font-style: italic; color: var(--c-heading); font-weight: 500; }
.paper__repo { background: var(--c-surface); padding: 12px 14px; border-left: 3px solid var(--c-accent); border-radius: var(--r-sm); font-size: 14px; color: var(--c-text); margin: 8px 0 0; }
.paper__repo-label { font-weight: 700; color: var(--c-text-mute); margin-right: 6px; letter-spacing: 0.04em; text-transform: uppercase; font-size: 12px; font-family: var(--font-mono); }
.paper__repo-url { font-family: var(--font-mono); font-size: 13px; color: var(--c-primary); word-break: break-all; }
.paper__badge { border: 1px solid var(--c-rule); background: var(--c-surface); padding: 32px 24px; text-align: center; border-radius: var(--r-lg); box-shadow: var(--shadow-subtle); max-width: 320px; margin-left: auto; }
.paper__badge-rule { height: 2px; background: var(--c-primary); margin: 0 auto 18px; width: 40px; }
.paper__badge-rule:last-child { margin: 18px auto 0; }
.paper__badge-title { font-family: var(--font-head); font-size: 42px; font-weight: 600; color: var(--c-heading); letter-spacing: -0.02em; }
.paper__badge-sub { font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--c-text-mute); font-weight: 500; margin-top: 4px; font-family: var(--font-mono); }

.cred__list { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 0; border-top: 1px solid var(--c-rule); border-left: 1px solid var(--c-rule); }
.cred__list li { display: flex; align-items: flex-start; gap: 16px; padding: 20px 22px; border-right: 1px solid var(--c-rule); border-bottom: 1px solid var(--c-rule); background: var(--c-surface); font-size: 15px; line-height: 1.55; color: var(--c-text); min-height: 90px; }
.cred__num { font-family: var(--font-mono); font-size: 12px; color: var(--c-primary); font-weight: 500; letter-spacing: 0.08em; padding-top: 2px; flex-shrink: 0; }

.cta__card { background: var(--c-surface); border: 1px solid var(--c-rule); color: #fff; border-radius: var(--r-lg); padding: 48px; display: grid; grid-template-columns: 1.4fr 1fr; gap: 40px; align-items: center; box-shadow: var(--shadow-medium); position: relative; overflow: hidden; }
.cta__card::before { content: ""; position: absolute; top: 0; left: 0; right: 0; height: 2px; background: var(--c-primary); }
.cta__head { color: #fff; font-size: clamp(22px, 2.8vw, 30px); line-height: 1.25; font-weight: 600; margin: 6px 0 16px; letter-spacing: -0.02em; }
.cta__copy { color: rgba(255,255,255,0.82); font-size: 16px; line-height: 1.65; max-width: 520px; margin-bottom: 12px; }
.cta__copy--thin { font-size: 14px; color: rgba(255,255,255,0.55); margin-bottom: 0; }
.cta__right { display: flex; flex-direction: column; align-items: stretch; gap: 14px; }
.cta__btn { display: inline-flex; align-items: center; justify-content: space-between; gap: 16px; background: var(--c-primary); color: var(--c-bg); font-weight: 700; padding: 18px 22px; border-radius: var(--r-md); text-decoration: none; font-size: 16px; letter-spacing: 0.01em; transition: background 180ms ease, transform 180ms ease; }
.cta__btn:hover { background: var(--c-accent); color: #fff; text-decoration: none; transform: translateY(-1px); }
.cta__btn-arrow { font-size: 20px; line-height: 1; }
.cta__link { text-align: center; font-size: 12px; line-height: 1.5; }
.cta__link-label { display: block; color: rgba(255,255,255,0.5); letter-spacing: 0.18em; text-transform: uppercase; font-weight: 600; margin-bottom: 2px; font-family: var(--font-mono); }
.cta__link-url { display: block; font-family: var(--font-mono); color: rgba(255,255,255,0.75); font-size: 13px; word-break: break-all; }

.foot { border-top: 1px solid var(--c-rule); background: var(--c-bg); padding: 24px 0 32px; }
.foot__inner { display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap; font-size: 13px; color: var(--c-text-mute); }
.foot__left { font-weight: 600; color: var(--c-text); }
.foot__right { color: var(--c-text-mute); }

a:focus-visible, .cta__btn:focus-visible { outline: 2px solid var(--c-primary); outline-offset: 3px; }

@media (max-width: 900px) {
  .split { grid-template-columns: 1fr; gap: 32px; }
  .paper__grid { grid-template-columns: 1fr; gap: 32px; }
  .paper__badge { margin: 0 auto; }
  .cta__card { grid-template-columns: 1fr; padding: 36px; }
  .statbar__grid { grid-template-columns: repeat(2, 1fr); }
  .stat { border-bottom: 1px solid var(--c-rule); }
  .stat:nth-child(2) { border-right: 0; }
  .stat:nth-child(3), .stat:nth-child(4) { border-bottom: 0; }
  .cred__list { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .wrap { padding: 0 18px; }
  .masthead__inner { padding: 16px 18px 14px; gap: 14px; }
  .masthead__logo img { height: 24px; }
  .hero { padding: 48px 0 32px; }
  h1#headline { font-size: 28px; margin: 20px 0 18px; }
  .hero__standfirst { font-size: 16px; }
  section.frame, section.case, section.paper, section.cred, section.cta { padding: 48px 0; }
  .case__card { padding: 24px 20px; }
  .translate-list li { grid-template-columns: 1fr; gap: 4px; padding: 10px 0; }
  .translate-list__arrow { display: none; }
  .translate-list__from { font-size: 13px; text-transform: uppercase; letter-spacing: 0.06em; }
  .cta__card { padding: 28px 22px; }
  .cta__head { font-size: 22px; }
  .stat { padding: 20px 16px; }
  .stat__num { font-size: 22px; }
  .paper__badge { padding: 24px 20px; }
  .paper__badge-title { font-size: 34px; }
  .foot__inner { flex-direction: column; align-items: flex-start; gap: 6px; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; animation: none !important; } }