/* aha_cn —— 沿用 coIntelligence Academy 的视觉语言：奶白底、深蓝品牌、金色 accent、JetBrains Mono + PingFang。*/

:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Noto Sans SC", "Helvetica Neue", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", "Fira Code", "Cascadia Mono", monospace;

  --color-void: #f8f6f1;
  --color-surface: #fdfcfa;
  --color-card: #ffffff;
  --color-ascii: #1a1a2e;
  --color-accent: #b8860b;
  --color-accent-bright: #d4a017;
  --color-accent-dim: rgba(184, 134, 11, 0.10);
  --color-brand: #1b4d6e;
  --color-brand-bright: #2471a3;
  --color-brand-dim: rgba(27, 77, 110, 0.08);
  --color-ghost: #6b7280;
  --color-dim: #9ca3af;
  --color-hair: rgba(0, 0, 0, 0.06);
  --color-hair-2: rgba(0, 0, 0, 0.10);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { background: var(--color-void); color: var(--color-ascii); font-family: var(--font-sans); -webkit-font-smoothing: antialiased; }
body { min-height: 100vh; line-height: 1.6; }

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }

/* ===== ambient backgrounds（轻量装饰，免依赖）===== */
.ambient-mesh {
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background:
    radial-gradient(900px 600px at 80% -10%, rgba(184, 134, 11, 0.08), transparent 60%),
    radial-gradient(800px 500px at -10% 40%, rgba(27, 77, 110, 0.06), transparent 60%);
}
.noise {
  position: fixed; inset: 0; z-index: 0; pointer-events: none; opacity: 0.35;
  background-image:
    radial-gradient(rgba(0,0,0,0.03) 1px, transparent 1px);
  background-size: 3px 3px;
}

/* ===== nav ===== */
.global-nav {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 28px;
  background: rgba(248, 246, 241, 0.78);
  backdrop-filter: saturate(140%) blur(10px);
  -webkit-backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--color-hair);
}
.brand {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
}
.brand .mark {
  display: inline-flex; align-items: center; justify-content: center;
  width: 28px; height: 28px; border-radius: 6px;
  background: var(--color-brand); color: #fff;
  font-weight: 700; font-size: 13px;
  box-shadow: 0 1px 0 rgba(0,0,0,0.05);
}
.brand .name {
  font-size: 14px; font-weight: 600; color: var(--color-ascii);
  letter-spacing: 0.04em; text-transform: none;
}
.brand .name em { font-style: normal; color: var(--color-accent); }
.brand-sub {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.15em;
  color: var(--color-ghost); padding-left: 10px; margin-left: 10px;
  border-left: 1px solid var(--color-hair-2);
  text-transform: uppercase;
}

.nav-links { display: flex; align-items: center; gap: 26px; }
.nav-links a {
  font-family: var(--font-mono); font-size: 13px; color: var(--color-ghost);
  transition: color 0.2s;
}
.nav-links a:hover, .nav-links a.active { color: var(--color-ascii); }
.nav-divider { color: var(--color-dim); }
.nav-cta {
  font-family: var(--font-mono); font-size: 13px; color: #fff; background: var(--color-brand);
  padding: 7px 16px; border-radius: 6px; letter-spacing: 0.04em;
}
.nav-cta:hover { background: var(--color-brand-bright); }

/* ===== layout ===== */
.wrap { position: relative; z-index: 10; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 32px; }
@media (max-width: 640px) {
  .container { padding: 0 20px; }
  .global-nav { padding: 12px 20px; }
  .nav-links { gap: 14px; }
  .nav-links a, .nav-cta, .brand-sub { font-size: 12px; }
}

/* ===== hero ===== */
.hero {
  position: relative; min-height: 78vh;
  display: flex; align-items: center; justify-content: center;
  padding: 96px 0 64px;
}
.hero-glow {
  position: absolute; inset: 0; pointer-events: none;
  background: radial-gradient(600px 400px at 50% 30%, rgba(184, 134, 11, 0.12), transparent 70%);
}
.hero-inner { position: relative; text-align: center; max-width: 880px; padding: 0 20px; }
.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 12px; letter-spacing: 0.28em; color: var(--color-accent);
  text-transform: uppercase; margin-bottom: 28px;
}
.hero-eyebrow::before, .hero-eyebrow::after { content: "—"; opacity: 0.4; margin: 0 10px; }
.hero h1 {
  font-size: clamp(36px, 6vw, 64px); line-height: 1.18; font-weight: 700;
  color: var(--color-ascii); letter-spacing: -0.01em;
  margin-bottom: 24px;
}
.hero h1 em { font-style: normal; color: var(--color-brand); }
.hero h1 .gold { color: var(--color-accent); }
.hero-tag {
  font-size: clamp(15px, 1.6vw, 18px); color: var(--color-ghost);
  max-width: 620px; margin: 0 auto 36px;
  line-height: 1.7;
}
.hero-actions { display: inline-flex; gap: 14px; flex-wrap: wrap; justify-content: center; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-mono); font-size: 13px; letter-spacing: 0.06em;
  padding: 12px 22px; border-radius: 8px;
  transition: all 0.2s; cursor: pointer; border: 1px solid transparent;
}
.btn-primary { background: var(--color-brand); color: #fff; }
.btn-primary:hover { background: var(--color-brand-bright); transform: translateY(-1px); }
.btn-ghost {
  background: transparent; color: var(--color-ascii);
  border-color: var(--color-hair-2);
}
.btn-ghost:hover { border-color: var(--color-brand); color: var(--color-brand); }

/* ascii decorative frame under hero */
.ascii-frame {
  margin: 56px auto 0; max-width: 760px;
  font-family: var(--font-mono); font-size: 11px;
  color: var(--color-dim); white-space: pre; line-height: 1.35;
  text-align: left; opacity: 0.55;
  user-select: none;
}

/* ===== section base ===== */
section { position: relative; padding: 80px 0; }
.section-divider {
  height: 1px; background: linear-gradient(to right, transparent, var(--color-hair-2), transparent);
  margin: 0 auto; max-width: 1200px;
}
.section-surface { background: var(--color-surface); }
.section-title {
  display: flex; align-items: center; gap: 18px;
  margin-bottom: 48px;
}
.section-title::before, .section-title::after {
  content: ""; flex: 1; height: 1px;
  background: linear-gradient(to right, transparent, var(--color-hair-2), transparent);
}
.section-title-text {
  font-family: var(--font-mono); font-size: 13px; letter-spacing: 0.24em;
  color: var(--color-ascii); text-transform: uppercase; font-weight: 600;
}

/* ===== advantages grid ===== */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
@media (max-width: 880px) { .grid-3 { grid-template-columns: 1fr; } }
.card {
  position: relative; padding: 32px 28px;
  background: var(--color-card); border: 1px solid var(--color-hair);
  border-radius: 10px; transition: all 0.4s;
}
.card:hover { border-color: rgba(27, 77, 110, 0.22); box-shadow: 0 4px 16px rgba(20, 20, 30, 0.05); }
.card .num {
  font-family: var(--font-mono); font-size: 13px; letter-spacing: 0.12em;
  color: rgba(184, 134, 11, 0.6); display: block; margin-bottom: 14px;
}
.card h3 { font-size: 22px; font-weight: 700; margin-bottom: 12px; color: var(--color-ascii); }
.card p { color: var(--color-ghost); font-size: 15px; line-height: 1.75; }

/* accent strip on left edge of card on hover */
.card-accent::before {
  content: ""; position: absolute; left: 0; top: 24px; bottom: 24px; width: 2px;
  background: var(--color-accent); opacity: 0; transition: opacity 0.3s;
  border-radius: 2px;
}
.card-accent:hover::before { opacity: 1; }

/* ===== stats ===== */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
@media (max-width: 720px) { .stats-grid { grid-template-columns: repeat(2, 1fr); } }
.stat {
  text-align: center; padding: 32px 16px;
  background: var(--color-card); border: 1px solid var(--color-hair); border-radius: 10px;
}
.stat .v {
  font-family: var(--font-mono); font-size: 56px; font-weight: 700;
  color: var(--color-brand); line-height: 1; font-variant-numeric: tabular-nums;
}
.stat .rule { width: 28px; height: 2px; background: var(--color-accent); margin: 18px auto 12px; border-radius: 2px; }
.stat .l { font-size: 14px; color: var(--color-ghost); letter-spacing: 0.04em; }

/* ===== curriculum list ===== */
.curr-meta {
  display: flex; align-items: center; gap: 14px; margin-bottom: 22px;
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.14em;
  color: var(--color-ghost); text-transform: uppercase;
}
.curr-meta .rule { flex: 1; height: 1px; background: linear-gradient(to right, var(--color-hair-2), transparent); }

.curr {
  border: 1px solid var(--color-hair);
  background: var(--color-card); border-radius: 12px; overflow: hidden;
}
.curr-row {
  display: grid; grid-template-columns: 56px 1fr 200px 150px;
  align-items: center; gap: 18px;
  padding: 16px 20px; border-bottom: 1px solid rgba(0,0,0,0.04);
  transition: background 0.3s;
}
.curr-row:last-child { border-bottom: 0; }
.curr-row:hover { background: var(--color-brand-dim); }
.curr-w { display: flex; align-items: center; gap: 10px; }
.curr-w .bar { width: 3px; height: 28px; border-radius: 2px; background: var(--color-accent); opacity: 0.45; }
.curr-w .lbl { font-family: var(--font-mono); font-size: 13px; color: var(--color-accent); font-weight: 600; }
.curr-title { font-size: 16px; font-weight: 500; color: var(--color-ascii); }
.curr-title .tag-en {
  font-family: var(--font-mono); font-size: 10px; color: #fff;
  background: rgba(184, 134, 11, 0.55); padding: 2px 6px; border-radius: 3px;
  letter-spacing: 0.08em; margin-left: 8px; font-weight: 600;
}
.curr-mentor { font-size: 13px; color: var(--color-ascii); }
.curr-mentor .role { display: block; font-size: 11px; color: var(--color-dim); margin-top: 2px; }
.curr-out {
  text-align: right;
}
.curr-out span {
  display: inline-block;
  font-size: 11px; color: rgba(184, 134, 11, 0.85);
  background: rgba(184, 134, 11, 0.08);
  padding: 4px 10px; border-radius: 999px; font-weight: 500;
  max-width: 100%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
@media (max-width: 720px) {
  .curr-row { grid-template-columns: 1fr; gap: 8px; padding: 16px; }
  .curr-out { text-align: left; }
}

/* ===== about ===== */
.about {
  display: grid; grid-template-columns: 1.2fr 1fr; gap: 56px;
  align-items: center;
}
@media (max-width: 880px) { .about { grid-template-columns: 1fr; gap: 32px; } }
.about-eyebrow {
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.22em;
  color: var(--color-accent); text-transform: uppercase; margin-bottom: 14px;
}
.about h2 { font-size: 32px; line-height: 1.3; font-weight: 700; margin-bottom: 18px; }
.about p { color: var(--color-ghost); font-size: 16px; line-height: 1.85; margin-bottom: 14px; }
.about-meta { display: flex; flex-wrap: wrap; gap: 18px 28px; margin-top: 22px; }
.about-meta .item { font-family: var(--font-mono); font-size: 13px; color: var(--color-ascii); }
.about-meta .item .k { color: var(--color-ghost); margin-right: 8px; }

.aha-logo {
  background: var(--color-card); border: 1px solid var(--color-hair);
  border-radius: 16px; padding: 56px 32px; text-align: center;
  position: relative; overflow: hidden;
}
.aha-logo .ring {
  position: absolute; inset: 14px; border-radius: 12px;
  border: 1px dashed rgba(184, 134, 11, 0.25); pointer-events: none;
}
.aha-logo .glyph {
  font-family: var(--font-mono); font-size: 88px; font-weight: 700;
  color: var(--color-brand); letter-spacing: 0.02em; line-height: 1;
}
.aha-logo .glyph em { font-style: normal; color: var(--color-accent); }
.aha-logo .cn {
  margin-top: 18px; font-size: 22px; font-weight: 600; letter-spacing: 0.4em;
  color: var(--color-ascii);
}
.aha-logo .est {
  margin-top: 14px; font-family: var(--font-mono); font-size: 12px;
  letter-spacing: 0.18em; color: var(--color-ghost); text-transform: uppercase;
}

/* ===== footer ===== */
.footer {
  border-top: 1px solid var(--color-hair); background: var(--color-surface);
  padding: 56px 0 36px;
}
.foot-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 48px;
  margin-bottom: 40px;
}
@media (max-width: 720px) { .foot-grid { grid-template-columns: 1fr; gap: 28px; } }
.foot-brand { font-family: var(--font-mono); font-size: 14px; }
.foot-brand .big { font-size: 22px; color: var(--color-brand); font-weight: 700; letter-spacing: 0.04em; }
.foot-brand .big em { font-style: normal; color: var(--color-accent); }
.foot-brand p { color: var(--color-ghost); font-size: 13px; line-height: 1.7; margin-top: 10px; max-width: 380px; }
.foot-col h4 { font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.18em; color: var(--color-ascii); text-transform: uppercase; margin-bottom: 14px; }
.foot-col ul { list-style: none; }
.foot-col li { font-size: 13px; color: var(--color-ghost); margin-bottom: 8px; }
.foot-col a:hover { color: var(--color-brand); }

.foot-bar {
  border-top: 1px solid var(--color-hair);
  padding-top: 24px;
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  gap: 14px;
  font-family: var(--font-mono); font-size: 12px; color: var(--color-ghost);
  letter-spacing: 0.04em;
}
.foot-bar .biz { color: var(--color-ascii); font-weight: 600; }
.foot-bar .biz em { font-style: normal; color: var(--color-accent); }
.foot-bar .icp { display: inline-flex; gap: 14px; flex-wrap: wrap; }
.foot-bar .icp a { color: var(--color-ghost); }
.foot-bar .icp a:hover { color: var(--color-ascii); }