/* ============================================
   超脑教育思考 · 宣言站
   Palette: Forest Breathing (象牙·森绿·古铜)
   ============================================ */

:root {
  --ivory: #f5f0e8;
  --ivory-deep: #eae3d4;
  --paper: #fbf8f2;
  --ink: #1a1916;
  --ink-soft: #3d3a33;
  --ink-mute: #6b6659;
  --forest: #4a7c59;
  --forest-deep: #2f5138;
  --bronze: #c9a96e;
  --bronze-deep: #a0824e;
  --clay: #b75d4a;
  --rule: rgba(26, 25, 22, 0.08);

  --font-serif: "Noto Serif SC", "Songti SC", "SimSun", "STSong", serif;
  --font-sans: "Noto Sans SC", -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", Consolas, monospace;

  --max-w: 1280px;
  --text-w: 68ch;
  --gutter: clamp(1.25rem, 4vw, 3rem);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; font-size: 17px; }
@media (max-width: 640px) { html { font-size: 16px; } }

body {
  background: var(--ivory);
  color: var(--ink);
  font-family: var(--font-serif);
  line-height: 1.75;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  letter-spacing: 0.01em;
}

a {
  color: var(--forest-deep);
  text-decoration: none;
  border-bottom: 1px solid rgba(74, 124, 89, 0.3);
  transition: color 0.2s, border-color 0.2s;
}
a:hover { color: var(--clay); border-color: var(--clay); }

.sans { font-family: var(--font-sans); }
.mono { font-family: var(--font-mono); }

/* ============================================
   Nav
   ============================================ */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(245, 240, 232, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--rule);
}
.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0.9rem var(--gutter);
  display: flex;
  align-items: center;
  gap: 2rem;
  font-family: var(--font-sans);
  font-size: 0.92rem;
}
.nav-brand {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.02rem;
  color: var(--ink);
  border: none;
  letter-spacing: 0.03em;
}
.nav-brand::before {
  content: "";
  display: inline-block;
  width: 10px;
  height: 10px;
  background: var(--forest);
  border-radius: 50%;
  margin-right: 0.6rem;
  vertical-align: 0.12em;
}
.nav-links { display: flex; gap: 1.5rem; margin-left: auto; }
.nav-links a {
  color: var(--ink-soft);
  border: none;
  position: relative;
  padding: 0.2rem 0;
}
.nav-links a:hover { color: var(--forest-deep); }
.nav-links a.active { color: var(--forest-deep); font-weight: 500; }
.nav-links a.active::after {
  content: "";
  position: absolute;
  bottom: -2px; left: 0; right: 0;
  height: 2px;
  background: var(--forest);
}
.nav-kb {
  color: var(--ivory) !important;
  background: var(--forest-deep);
  padding: 0.4rem 0.9rem;
  border-radius: 2px;
  border: none !important;
  font-size: 0.85rem;
}
.nav-kb:hover { background: var(--forest); color: var(--ivory) !important; }

@media (max-width: 720px) {
  .nav-inner { gap: 1rem; font-size: 0.85rem; }
  .nav-links { gap: 1rem; }
  .nav-links .nav-hide-mobile { display: none; }
}

/* ============================================
   Layout
   ============================================ */
main { min-height: 60vh; }

.container { max-width: var(--max-w); margin: 0 auto; padding: 0 var(--gutter); }
.prose { max-width: var(--text-w); margin: 0 auto; padding: 0 var(--gutter); }

section { padding: clamp(3rem, 8vw, 6rem) 0; }

/* ============================================
   Home Hero
   ============================================ */
.hero {
  padding: clamp(4rem, 10vw, 9rem) 0 clamp(3rem, 6vw, 5rem);
  background: linear-gradient(180deg, var(--paper) 0%, var(--ivory) 100%);
  position: relative;
  overflow: hidden;
}
.hero-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: clamp(2rem, 6vw, 5rem);
  align-items: center;
}
@media (max-width: 860px) { .hero-inner { grid-template-columns: 1fr; } }

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  line-height: 1.15;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 1.8rem;
}
.hero h1 em {
  font-style: normal;
  color: var(--forest-deep);
  font-weight: 700;
  position: relative;
}
.hero h1 em::after {
  content: "";
  position: absolute;
  bottom: 0.1em; left: -0.05em; right: -0.05em;
  height: 0.35em;
  background: rgba(201, 169, 110, 0.28);
  z-index: -1;
}

.hero-sub {
  font-size: clamp(1.02rem, 1.6vw, 1.2rem);
  color: var(--ink-soft);
  line-height: 1.75;
  margin-bottom: 2rem;
  max-width: 42ch;
}

.hero-meta {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  color: var(--ink-mute);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 1.5rem;
}
.hero-meta::before {
  content: "—— ";
  color: var(--bronze);
}

.hero-ctas { display: flex; gap: 1rem; flex-wrap: wrap; margin-top: 1rem; }
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  border: 1.5px solid var(--forest-deep);
  border-radius: 2px;
  background: transparent;
  color: var(--forest-deep);
  transition: all 0.2s;
  cursor: pointer;
}
.btn:hover { background: var(--forest-deep); color: var(--ivory); border-color: var(--forest-deep); }
.btn-primary { background: var(--forest-deep); color: var(--ivory); }
.btn-primary:hover { background: var(--forest); }

.hero-image {
  position: relative;
  aspect-ratio: 4/5;
  border-radius: 3px;
  overflow: hidden;
  box-shadow: 0 40px 80px -40px rgba(26, 25, 22, 0.25);
}
.hero-image img { width: 100%; height: 100%; object-fit: cover; display: block; }
.hero-image::after {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(135deg, transparent 60%, rgba(47, 81, 56, 0.15));
  pointer-events: none;
}

/* ============================================
   Pyramid Architecture Section
   ============================================ */
.arch { background: var(--paper); border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule); }
.arch-title {
  text-align: center;
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 600;
  margin-bottom: 0.8rem;
}
.arch-intro {
  text-align: center;
  max-width: 52ch;
  margin: 0 auto 3.5rem;
  color: var(--ink-soft);
  font-size: 1.05rem;
}

.pyramid {
  max-width: 940px;
  margin: 0 auto;
}
.pyramid-tier {
  display: grid;
  gap: 1rem;
  margin-bottom: 1rem;
}
.pyramid-tier-label {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  color: var(--bronze-deep);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  text-align: center;
  margin-bottom: 0.4rem;
}
.pyramid-card {
  background: var(--ivory);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--forest);
  padding: 1.2rem 1.4rem;
  transition: all 0.25s;
  display: block;
  color: var(--ink);
  border-bottom: 1px solid var(--rule);
}
.pyramid-card:hover {
  transform: translateX(4px);
  border-left-color: var(--clay);
  color: var(--ink);
  border-bottom-color: var(--rule);
}
.pyramid-card .num {
  font-family: var(--font-sans);
  color: var(--bronze-deep);
  font-weight: 600;
  font-size: 0.82rem;
  letter-spacing: 0.05em;
}
.pyramid-card .t {
  font-size: 1.08rem;
  font-weight: 600;
  margin: 0.25rem 0 0.4rem;
}
.pyramid-card .d {
  font-size: 0.93rem;
  color: var(--ink-soft);
  line-height: 1.6;
}

.t1 { grid-template-columns: 1fr; }
.t1 .pyramid-card { border-left-color: var(--clay); background: #fbf8f2; }
.t3 { grid-template-columns: repeat(3, 1fr); }
.t2 { grid-template-columns: repeat(2, 1fr); }
.t6 { grid-template-columns: repeat(3, 1fr); }

@media (max-width: 720px) {
  .t3, .t6 { grid-template-columns: 1fr; }
  .t2 { grid-template-columns: 1fr; }
}

.pyramid-horizontal-note {
  text-align: center;
  margin: 1.5rem 0;
  color: var(--ink-mute);
  font-size: 0.88rem;
  font-family: var(--font-sans);
}

/* ============================================
   Three Forces (home feature)
   ============================================ */
.forces {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(1.5rem, 3vw, 3rem);
  margin-top: 3rem;
}
@media (max-width: 720px) { .forces { grid-template-columns: 1fr; } }

.force {
  padding: 2rem 0;
  border-top: 2px solid var(--forest);
}
.force-num {
  font-family: var(--font-sans);
  color: var(--bronze-deep);
  font-size: 0.85rem;
  letter-spacing: 0.15em;
  margin-bottom: 0.4rem;
}
.force-name {
  font-size: 1.8rem;
  font-weight: 600;
  margin-bottom: 0.3rem;
}
.force-role {
  font-family: var(--font-sans);
  color: var(--forest-deep);
  font-size: 0.92rem;
  margin-bottom: 0.8rem;
}
.force-desc { color: var(--ink-soft); font-size: 0.98rem; }

/* ============================================
   Section: Declaration Block (the 9 principles / slogans)
   ============================================ */
.tenets {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0;
}
@media (max-width: 720px) { .tenets { grid-template-columns: 1fr; } }
.tenet {
  padding: 2rem 1.5rem;
  border-top: 1px solid var(--rule);
  border-right: 1px solid var(--rule);
}
.tenet:nth-child(even) { border-right: none; }
@media (max-width: 720px) { .tenet { border-right: none; } }
.tenet-n {
  font-family: var(--font-mono);
  color: var(--bronze-deep);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
}
.tenet-t {
  font-size: 1.3rem;
  font-weight: 600;
  margin: 0.3rem 0 0.6rem;
}
.tenet-d { color: var(--ink-soft); line-height: 1.7; font-size: 0.98rem; }

/* ============================================
   Chapter page styling
   ============================================ */
.ch-hero {
  padding: clamp(3rem, 8vw, 6rem) 0 clamp(2rem, 4vw, 3rem);
  position: relative;
}
.ch-hero-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: end;
}
@media (max-width: 860px) { .ch-hero-inner { grid-template-columns: 1fr; } }

.ch-label {
  font-family: var(--font-sans);
  color: var(--bronze-deep);
  font-size: 0.88rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}
.ch-title {
  font-size: clamp(2rem, 4.5vw, 3.4rem);
  line-height: 1.2;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 1.5rem;
}
.ch-subtitle {
  font-size: clamp(1.1rem, 1.8vw, 1.35rem);
  color: var(--ink-soft);
  max-width: 36ch;
  line-height: 1.7;
  border-left: 3px solid var(--forest);
  padding-left: 1.2rem;
  font-style: italic;
}

.ch-image {
  aspect-ratio: 4/5;
  border-radius: 3px;
  overflow: hidden;
  box-shadow: 0 30px 70px -30px rgba(26, 25, 22, 0.3);
}
.ch-image img { width: 100%; height: 100%; object-fit: cover; display: block; }

/* Quote spotlight */
.quotes {
  padding: clamp(3rem, 6vw, 5rem) 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  background: var(--paper);
}
.quotes-inner {
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(1.5rem, 3vw, 3rem);
}
@media (max-width: 720px) { .quotes-inner { grid-template-columns: 1fr; } }
.quote {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  line-height: 1.7;
  color: var(--ink);
  position: relative;
  padding-top: 2rem;
}
.quote::before {
  content: "“";
  position: absolute;
  top: -0.5rem; left: -0.3rem;
  font-size: 4rem;
  color: var(--bronze);
  line-height: 1;
  font-family: Georgia, serif;
}
.quote-attr {
  display: block;
  margin-top: 1rem;
  font-family: var(--font-sans);
  font-size: 0.82rem;
  color: var(--ink-mute);
  letter-spacing: 0.05em;
}

/* Body sections */
.ch-body {
  padding: clamp(3rem, 6vw, 5rem) 0;
}
.ch-body h2 {
  font-size: clamp(1.5rem, 2.6vw, 1.9rem);
  font-weight: 600;
  margin: 3rem 0 1rem;
  color: var(--ink);
  letter-spacing: -0.005em;
}
.ch-body h2:first-child { margin-top: 0; }
.ch-body h2 .kicker {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  color: var(--bronze-deep);
  text-transform: uppercase;
  margin-bottom: 0.3rem;
  font-weight: 500;
}
.ch-body h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin: 2rem 0 0.6rem;
  color: var(--forest-deep);
}
.ch-body p { margin-bottom: 1.2rem; font-size: 1.02rem; line-height: 1.85; }
.ch-body ul, .ch-body ol { margin: 1rem 0 1.5rem 1.4rem; }
.ch-body li { margin-bottom: 0.4rem; font-size: 1.02rem; }
.ch-body strong { color: var(--forest-deep); font-weight: 600; }
.ch-body em { color: var(--bronze-deep); font-style: italic; }

.callout {
  background: rgba(74, 124, 89, 0.07);
  border-left: 3px solid var(--forest);
  padding: 1.4rem 1.6rem;
  margin: 2rem 0;
  border-radius: 2px;
}
.callout .label {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--forest-deep);
  margin-bottom: 0.5rem;
  font-weight: 600;
}

.case-card {
  background: var(--paper);
  border: 1px solid var(--rule);
  padding: 2rem;
  margin: 2.5rem 0;
  position: relative;
}
.case-card::before {
  content: "案例";
  position: absolute;
  top: -12px; left: 1.5rem;
  background: var(--ivory);
  padding: 0 0.7rem;
  font-family: var(--font-sans);
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  color: var(--clay);
}
.case-card h4 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 0.7rem;
  color: var(--ink);
}

/* Cross-links footer */
.ch-links {
  padding: clamp(2rem, 5vw, 4rem) 0;
  border-top: 1px solid var(--rule);
  background: var(--paper);
}
.ch-links-inner { max-width: var(--max-w); margin: 0 auto; padding: 0 var(--gutter); }
.ch-links-label {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin-bottom: 1.2rem;
}
.ch-links-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
@media (max-width: 720px) { .ch-links-grid { grid-template-columns: 1fr; } }
.ch-link {
  display: block;
  padding: 1.2rem 1.4rem;
  background: var(--ivory);
  border: 1px solid var(--rule);
  color: var(--ink);
  border-bottom: 1px solid var(--rule);
  transition: all 0.2s;
}
.ch-link:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px -12px rgba(26, 25, 22, 0.15);
  border-color: var(--forest);
  color: var(--ink);
  border-bottom-color: var(--forest);
}
.ch-link .n { font-family: var(--font-sans); font-size: 0.82rem; color: var(--bronze-deep); letter-spacing: 0.05em; }
.ch-link .t { font-size: 1.05rem; font-weight: 600; margin: 0.3rem 0 0.5rem; }
.ch-link .d { font-size: 0.88rem; color: var(--ink-soft); line-height: 1.6; }

/* Chapter grid on home */
.chapters {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.2rem;
  margin-top: 3rem;
}
@media (max-width: 1024px) { .chapters { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 540px) { .chapters { grid-template-columns: 1fr; } }

.chapter-tile {
  background: var(--paper);
  border: 1px solid var(--rule);
  padding: 1.5rem 1.4rem;
  color: var(--ink);
  border-bottom: 1px solid var(--rule);
  transition: all 0.2s;
  display: block;
}
.chapter-tile:hover {
  border-color: var(--forest);
  border-bottom-color: var(--forest);
  color: var(--ink);
  transform: translateY(-3px);
  box-shadow: 0 15px 40px -20px rgba(26, 25, 22, 0.2);
}
.chapter-tile .num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.15rem 0.5rem;
  background: var(--forest);
  color: var(--ivory);
  letter-spacing: 0.05em;
  border-radius: 2px;
  margin-bottom: 0.8rem;
}
.chapter-tile .layer {
  font-family: var(--font-sans);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--bronze-deep);
  margin-bottom: 0.3rem;
}
.chapter-tile .title {
  font-size: 1.15rem;
  font-weight: 600;
  line-height: 1.35;
  margin-bottom: 0.6rem;
}
.chapter-tile .summary {
  font-size: 0.9rem;
  color: var(--ink-soft);
  line-height: 1.65;
}

/* Footer */
footer.site-footer {
  margin-top: 6rem;
  padding: 3rem 0 2.5rem;
  border-top: 1px solid var(--rule);
  background: var(--paper);
  font-family: var(--font-sans);
  font-size: 0.88rem;
  color: var(--ink-mute);
}
footer.site-footer .container {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
}
footer.site-footer a { color: var(--forest-deep); }
footer.site-footer .col-title {
  font-family: var(--font-serif);
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 0.5rem;
  font-size: 0.95rem;
}

/* Utils */
.center { text-align: center; }
.eyebrow {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--bronze-deep);
  margin-bottom: 1rem;
}
.divider {
  max-width: 80px;
  margin: 2rem auto;
  border: 0;
  border-top: 2px solid var(--bronze);
}
.lead {
  font-size: 1.15rem;
  color: var(--ink-soft);
  line-height: 1.8;
  max-width: var(--text-w);
  margin: 0 auto 2rem;
}

/* Fade-in on load */
@keyframes rise { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: none; } }
.rise { animation: rise 0.7s ease-out; }
.rise-d1 { animation: rise 0.7s ease-out 0.08s both; }
.rise-d2 { animation: rise 0.7s ease-out 0.16s both; }
.rise-d3 { animation: rise 0.7s ease-out 0.24s both; }