/* ══════════════════════════════════════
   MOSAIC — index.html (時間之樹 · 落地頁)
   ══════════════════════════════════════ */

:root {
  --color-now:    #ff6b35;
  --color-recent: #f7931e;
  --color-mid:    #c45ab8;
  --color-distant:#6b6bd6;
  --color-ancient:#2a4a8c;
  --bg:      #fafaf7;
  --bg-paper:#f5f1e8;
  --text:    #1a1a1a;
  --text-soft:#4a4a4a;
  --text-dim: #8a8a8a;
  --line:    #1a1a1a;
}

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

html { scroll-behavior:smooth; }

body {
  background:var(--bg);
  color:var(--text);
  font-family:'Noto Serif TC',serif;
  overflow-x:hidden;
}

/* 纸张纹理 */
body::before {
  content:'';
  position:fixed; top:0; left:0; right:0; bottom:0;
  background-image:
    radial-gradient(circle at 20% 30%, rgba(255,107,53,0.03) 0%, transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(107,107,214,0.03) 0%, transparent 50%);
  pointer-events:none; z-index:0;
}

.noise {
  position:fixed; inset:0; pointer-events:none; opacity:0.04; z-index:0;
  background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ── 頂部導航 ── */
.topnav {
  position:fixed; top:0; left:0; right:0; height:60px;
  background:rgba(250,250,247,0.88);
  backdrop-filter:blur(20px); -webkit-backdrop-filter:blur(20px);
  border-bottom:1px solid rgba(0,0,0,0.05);
  display:flex; align-items:center; justify-content:space-between;
  padding:0 32px; z-index:100;
}

.logo {
  font-family:'DM Sans',sans-serif; font-weight:800; font-size:22px;
  letter-spacing:-0.02em; display:flex; align-items:center; gap:10px;
  text-decoration:none; color:var(--text);
}

/* Logo 條狀玻璃（與 archive.html 統一） */
.logo-mark {
  display:flex; align-items:flex-end; gap:2px; flex-shrink:0; height:26px;
}
.shard {
  width:5px; border-radius:1px; transform-origin:bottom center;
  position:relative; overflow:hidden;
}
.shard::after {
  content:''; position:absolute; inset:0;
  background:linear-gradient(135deg,transparent 0%,rgba(255,255,255,.5) 45%,rgba(255,255,255,.9) 50%,rgba(255,255,255,.5) 55%,transparent 100%);
  transform:translateX(-150%); animation:sunlight 12s ease-in-out infinite;
}
.shard:nth-child(1){ height:16px; background:#e8463a; }
.shard:nth-child(2){ height:21px; background:#f07c3a; } .shard:nth-child(2)::after{ animation-delay:.4s; }
.shard:nth-child(3){ height:26px; background:#f5c842; } .shard:nth-child(3)::after{ animation-delay:.8s; }
.shard:nth-child(4){ height:23px; background:#3a9e5f; } .shard:nth-child(4)::after{ animation-delay:1.2s; }
.shard:nth-child(5){ height:18px; background:#3a6fe8; } .shard:nth-child(5)::after{ animation-delay:1.6s; }
.shard:nth-child(6){ height:13px; background:#8a3ae8; } .shard:nth-child(6)::after{ animation-delay:2s; }
@keyframes sunlight {
  0%{ transform:translateX(-150%); }
  15%{ transform:translateX(150%); }
  100%{ transform:translateX(150%); }
}

.nav-actions {
  display:flex; gap:20px; align-items:center;
  font-family:'Noto Sans TC','Noto Sans SC',sans-serif;
  font-size:13px; font-weight:500;
}
.nav-actions a {
  color:var(--text-soft); text-decoration:none;
  transition:color 0.2s; cursor:pointer;
}
.nav-actions a:hover { color:var(--color-now); }

.nav-actions .nav-link-archive {
  display:inline-flex; align-items:center; gap:6px;
  padding:7px 18px;
  border:1px solid var(--line); border-radius:999px;
  color:var(--text); font-weight:600; font-size:13px;
  font-family:'Noto Sans TC','Noto Sans SC',sans-serif; letter-spacing:.02em;
  transition:all .2s;
}
.nav-actions .nav-link-archive::after { content:'→'; transition:transform .2s; }
.nav-actions .nav-link-archive:hover {
  background:var(--line); color:var(--bg);
}
.nav-actions .nav-link-archive:hover::after { transform:translateX(3px); }

.nav-actions .nav-cta {
  padding:6px 16px;
  border:1px solid var(--line); border-radius:2px;
  color:var(--text); font-weight:600; font-size:12px;
  font-family:'DM Mono',monospace; letter-spacing:.08em;
  transition:all .2s;
}
.nav-actions .nav-cta:hover {
  background:var(--line); color:var(--bg);
}

.lang-toggle {
  font-family:'DM Mono',monospace; font-size:11px;
  padding:4px 10px; border:1px solid var(--line);
  border-radius:4px; background:transparent;
  cursor:pointer; color:var(--text);
  transition:all .2s;
}
.lang-toggle:hover { background:var(--line); color:var(--bg); }

/* ── Hero ── */
.hero {
  position:relative; padding:160px 32px 80px;
  text-align:center; z-index:1;
}

.hero-eyebrow {
  font-family:'DM Mono',monospace; font-size:11px;
  text-transform:uppercase; letter-spacing:0.3em;
  color:var(--text-dim); margin-bottom:28px;
}

.hero-title {
  font-family:'Noto Serif TC',serif;
  font-size:clamp(34px,6vw,72px); font-weight:900;
  line-height:1.1; letter-spacing:-0.03em; margin-bottom:24px;
}
.hero-title .accent {
  background:linear-gradient(135deg, var(--color-now), var(--color-mid));
  -webkit-background-clip:text; background-clip:text;
  -webkit-text-fill-color:transparent; font-style:italic;
}

.hero-subtitle {
  font-family:'Noto Serif TC',serif; font-size:17px; font-weight:400;
  color:var(--text-soft); max-width:580px; margin:0 auto 16px;
  line-height:1.7; font-style:italic;
}

.hero-quote {
  font-family:'DM Mono',monospace; font-size:12px;
  color:var(--text-dim); letter-spacing:0.05em;
  margin-top:36px; line-height:1.9;
}
.hero-quote::before, .hero-quote::after {
  content:'—'; margin:0 12px; color:var(--color-now);
}

.scroll-hint {
  display:flex; flex-direction:column; align-items:center; gap:8px;
  margin-top:60px; font-family:'DM Mono',monospace; font-size:10px;
  letter-spacing:0.2em; color:var(--text-dim); text-transform:uppercase;
}
.scroll-arrow {
  width:1px; height:40px;
  background:linear-gradient(to bottom, var(--color-now), transparent);
  animation:scrollPulse 2s ease-in-out infinite;
}
@keyframes scrollPulse {
  0%,100%{ opacity:.3; transform:scaleY(.6); transform-origin:top; }
  50%{ opacity:1; transform:scaleY(1); }
}

/* ── 時間樹容器 ── */
.tree-container {
  position:relative; max-width:1200px;
  margin:0 auto; padding:60px 32px 200px; z-index:1;
}

.tree-trunk-svg {
  position:absolute; top:0; left:50%;
  transform:translateX(-50%);
  width:4px; height:100%;
  pointer-events:none; z-index:1;
}

/* 年份分隔線 */
.year-divider {
  position:relative; text-align:center;
  margin:40px 0; z-index:2;
}
.year-divider .year-text {
  display:inline-block; background:var(--bg);
  padding:8px 24px;
  font-family:'DM Mono',monospace; font-size:14px; font-weight:500;
  letter-spacing:0.2em; color:var(--text-soft);
  position:relative; z-index:2;
}
.year-divider .year-line {
  position:absolute; top:50%; left:0; right:0;
  height:1px; background:rgba(0,0,0,.08); z-index:1;
}

/* 節點 */
.event-node {
  position:relative; display:flex;
  align-items:flex-start; gap:40px;
  margin-bottom:60px; z-index:2;
  opacity:0; transform:translateY(30px);
  transition:opacity 0.8s cubic-bezier(0.16,1,0.3,1),
              transform 0.8s cubic-bezier(0.16,1,0.3,1);
}
.event-node.visible { opacity:1; transform:translateY(0); }
.event-node.left  { flex-direction:row;         padding-right:50%; padding-left:0; }
.event-node.right { flex-direction:row-reverse; padding-left:50%;  padding-right:0; }

/* 節點圓點 */
.node-dot {
  position:absolute; left:50%; top:24px;
  width:14px; height:14px; border-radius:50%;
  transform:translateX(-50%); z-index:5;
  box-shadow:0 0 0 4px var(--bg), 0 0 0 5px currentColor;
}
.node-dot::after {
  content:''; position:absolute; inset:-8px;
  border-radius:50%; border:1px solid currentColor;
  opacity:.3; animation:pulse 3s ease-in-out infinite;
}
@keyframes pulse {
  0%,100%{ transform:scale(1); opacity:.3; }
  50%{ transform:scale(1.4); opacity:0; }
}

/* 連接線 */
.node-connector {
  position:absolute; top:30px; height:1px;
  background:currentColor; opacity:.5; z-index:3;
}
.event-node.left  .node-connector { right:50%; width:calc(50% - 80px); margin-right:7px; }
.event-node.right .node-connector { left:50%;  width:calc(50% - 80px); margin-left:7px; }

/* 卡片 */
.event-card {
  background:var(--bg-paper); border:1px solid rgba(0,0,0,.08);
  border-radius:2px; padding:24px 28px; width:100%; max-width:420px;
  cursor:default; transition:all .4s cubic-bezier(0.16,1,0.3,1);
  box-shadow:0 1px 3px rgba(0,0,0,.04);
  position:relative; z-index:4; /* 高於連接線(z-3)與樹幹,避免線條壓住卡片文字 */
}
.event-node.left  .event-card { margin-left:auto; }
.event-node.right .event-card { margin-right:auto; }
.event-card:hover {
  transform:translateY(-2px);
  box-shadow:0 12px 40px rgba(0,0,0,.08);
  border-color:currentColor;
}

.card-meta {
  display:flex; align-items:center; gap:12px;
  margin-bottom:12px;
  font-family:'DM Mono',monospace; font-size:11px; letter-spacing:.05em;
}
.card-date   { color:currentColor; font-weight:500; }
.card-region { color:var(--text-dim); text-transform:uppercase; }
.card-tag {
  margin-left:auto; padding:3px 8px;
  /* 時代色加深30%作底+純白粗體字,確保各時代色均達到可讀對比度(社群反饋:對比度過低) */
  background:color-mix(in srgb, currentColor 70%, #1a1a1a);
  -webkit-text-fill-color:#fff; /* 只塗文字、不改變 color 計算值,背景仍能繼承時代色 */
  border-radius:2px; font-size:10px;
  text-transform:uppercase; letter-spacing:.1em; font-weight:600;
}

.card-title {
  font-family:'Noto Serif TC',serif; font-size:21px; font-weight:700;
  line-height:1.3; margin-bottom:12px; letter-spacing:-.02em; color:var(--text);
}
.card-title.gradient-now {
  background:linear-gradient(135deg, var(--color-now), var(--color-recent));
  -webkit-background-clip:text; background-clip:text;
  -webkit-text-fill-color:transparent;
}

.card-summary {
  font-family:'Noto Sans TC','Noto Sans SC',sans-serif;
  font-size:14px; font-weight:400;
  line-height:1.75; color:var(--text-soft);
}

/* 時代色 */
.era-now     { color:var(--color-now); }
.era-recent  { color:var(--color-recent); }
.era-mid     { color:var(--color-mid); }
.era-distant { color:var(--color-distant); }
.era-ancient { color:var(--color-ancient); }

/* 章節引言 */
.epoch-quote {
  margin:100px auto; max-width:600px;
  text-align:center; padding:24px 32px;
  position:relative; z-index:2;
  background:var(--bg); /* 遮住背後的樹幹線,避免線條穿過引言文字 */
}
.epoch-quote-text {
  font-family:'Noto Serif TC',serif; font-size:27px; font-weight:400;
  font-style:italic; line-height:1.55; color:var(--text-soft);
  letter-spacing:-.01em; margin-bottom:20px;
}
.epoch-quote-cite {
  font-family:'DM Mono',monospace; font-size:11px;
  color:var(--text-dim); letter-spacing:.2em; text-transform:uppercase;
}

/* 樹根 · 底部 CTA */
.tree-root {
  text-align:center; padding:100px 32px 60px;
  position:relative; z-index:2;
  background:var(--bg); /* 遮住背後的樹幹線 */
}
.tree-root-text {
  font-family:'Noto Serif TC',serif; font-size:14px;
  font-style:italic; color:var(--text-dim);
  margin-bottom:32px; line-height:1.9;
}
.tree-root-cta {
  display:inline-block;
  font-family:'DM Mono',monospace; font-size:12px; font-weight:500;
  letter-spacing:.15em; text-transform:uppercase;
  color:var(--text); text-decoration:none;
  padding:16px 40px; border:1px solid var(--line);
  background:var(--bg); cursor:pointer; transition:all .3s;
}
.tree-root-cta:hover { background:var(--line); color:var(--bg); }

/* ── 逃生按鈕 ── */
.panic-button {
  position:fixed; bottom:20px; right:20px;
  width:44px; height:44px; border-radius:50%;
  background:rgba(100,100,100,.12);
  border:1px solid rgba(150,150,150,.18);
  color:#888; font-size:18px; cursor:pointer;
  display:flex; align-items:center; justify-content:center;
  z-index:10000; transition:all .2s; backdrop-filter:blur(8px);
}
.panic-button:hover {
  background:rgba(255,59,48,.12);
  border-color:rgba(255,59,48,.25);
  color:rgba(255,59,48,.85); transform:scale(1.05);
}

/* ── 偽裝頁面（食譜） ── */
.disguise-page {
  display:none; position:fixed; inset:0;
  background:#fff; z-index:9998; overflow-y:auto; padding:20px;
}
.disguise-page.active { display:block; }
.disguise-content {
  max-width:800px; margin:0 auto;
  font-family:'Noto Sans SC','Microsoft YaHei',sans-serif;
  color:#333; line-height:1.8;
}
.disguise-header { text-align:center; padding:20px 0 30px; border-bottom:2px solid #e74c3c; }
.disguise-title  { font-size:32px; font-weight:700; color:#e74c3c; margin-bottom:8px; }
.disguise-subtitle { font-size:14px; color:#666; }
.disguise-recipe { padding:30px 0; border-bottom:1px solid #eee; }
.disguise-recipe-img   { font-size:48px; text-align:center; margin-bottom:15px; line-height:1; }
.disguise-recipe-title { font-size:22px; font-weight:600; color:#333; margin-bottom:15px; text-align:center; }
.disguise-recipe-meta  { font-size:13px; color:#999; margin-bottom:20px; text-align:center; }
.disguise-recipe-section { margin-bottom:20px; }
.disguise-recipe-section h3  { font-size:16px; font-weight:600; color:#e74c3c; margin-bottom:10px; }
.disguise-recipe-section ul  { list-style:none; padding-left:0; }
.disguise-recipe-section li  { padding:5px 0; font-size:14px; line-height:1.8; }
.disguise-recipe-section li::before { content:'• '; color:#e74c3c; font-weight:bold; margin-right:8px; }
.disguise-recipe-section p   { font-size:14px; line-height:1.8; margin-bottom:8px; }

/* ── Responsive ── */
@media (max-width:768px) {
  .topnav { padding:0 18px; }
  .nav-actions { gap:12px; }
  .nav-actions .nav-link-archive { padding:6px 14px; font-size:12.5px; }
  .hero { padding:110px 20px 60px; }
  .hero-title { font-size:34px; }
  .hero-subtitle { font-size:15px; }
  .hero-quote { font-size:11px; }
  .tree-container { padding:40px 20px 100px; }
  .tree-trunk-svg { left:20px; transform:none; }
  .event-node,
  .event-node.left,
  .event-node.right {
    flex-direction:row;
    padding-left:50px; padding-right:0;
  }
  .node-dot { left:20px; transform:translateX(-50%); }
  .event-node.left  .node-connector,
  .event-node.right .node-connector {
    left:20px; right:auto; width:22px; margin:0;
  }
  .event-card { max-width:100%; margin:0 !important; padding:20px; }
  .card-title { font-size:18px; }
  .card-summary { font-size:13px; }
  .epoch-quote-text { font-size:22px; }
  .epoch-quote { margin:70px auto; }
}

@media (max-width:480px) {
  .hero-quote::before,
  .hero-quote::after { display:none; }
  .hero-quote { padding:0 20px; text-align:left; }
}