/* ============================================================
   ❤️  300 天纪念日 · 视觉样式
   Design read（taste-skill）: romantic anniversary experience on deep night,
   premium-craft "Terracotta + Slate" family — NOT the pink/rose+gold AI default.
   配色：深墨蓝灰夜 + 陶土/余烬主强调 + 骨白文字（单强调色，克制渐变）
   ============================================================ */

:root {
  --bg: #14171f;
  --bg-2: #191e28;
  --accent: #c9764f;        /* 陶土 / 余烬 —— 唯一强调色 */
  --accent-2: #e0a37b;      /* 温杏色高光，仅低调点缀 */
  --text: #f0ebe3;          /* 骨白 */
  --muted: #9aa1af;         /* 冷灰 */
  --card: rgba(240, 235, 227, 0.05);
  --card-strong: rgba(240, 235, 227, 0.09);
  --border: rgba(240, 235, 227, 0.12);
  --border-soft: rgba(240, 235, 227, 0.07);
  --radius: 18px;
  --radius-lg: 28px;
  --radius-pill: 999px;
  --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-hand: "Kaiti SC", "STKaiti", "KaiTi", "Ma Shan Zheng", "Caveat", cursive;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
  --glow: 0 0 0 1px rgba(201, 118, 79, 0.2), 0 12px 40px rgba(201, 118, 79, 0.14);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

#starfield {
  position: fixed;
  inset: 0;
  z-index: -2;
  background: radial-gradient(ellipse at 20% 0%, #1e2431 0%, #14171f 55%, #0b0d13 100%);
  pointer-events: none;
}

main { position: relative; z-index: 1; }

.container {
  width: min(1100px, 92%);
  margin: 0 auto;
  padding: clamp(60px, 9vw, 120px) 0;
}

/* ============ 通用动效：滚动浮现 ============ */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.8s ease, transform 0.8s cubic-bezier(0.22, 1, 0.36, 1);
}
.reveal.in { opacity: 1; transform: translateY(0); }
.reveal.d1 { transition-delay: 0.1s; }
.reveal.d2 { transition-delay: 0.2s; }
.reveal.d3 { transition-delay: 0.3s; }

/* ============ 开场序章 ============ */
#overture {
  position: relative;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 24px;
}
.overture-inner { max-width: 820px; }

.overture-line {
  font-size: clamp(1.6rem, 6vw, 3.4rem);
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--text);
  opacity: 0;
  transform: translateY(14px);
  animation: lineIn 1.1s ease forwards;
}
.overture-line.big {
  font-size: clamp(4rem, 18vw, 11rem);
  font-weight: 700;
  line-height: 1;
  background: linear-gradient(135deg, var(--accent-2), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin: 4px 0;
  text-shadow: 0 0 50px rgba(201, 118, 79, 0.3);
}
.overture-line.name {
  font-family: var(--font-hand);
  font-size: clamp(1.8rem, 7vw, 3.2rem);
  color: var(--accent-2);
}
.overture-line:nth-child(1) { animation-delay: 0.25s; }
.overture-line.big { animation-delay: 0.95s; }
.overture-line:nth-child(3) { animation-delay: 1.55s; }
.overture-line.name { animation-delay: 1.95s; }

@keyframes lineIn {
  to { opacity: 1; transform: translateY(0); }
}

.btn-start {
  margin-top: 44px;
  opacity: 0;
  animation: fadeUp 1s ease 2.4s forwards;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  padding: 16px 36px;
  border-radius: var(--radius-pill);
  font-size: 1.05rem;
  cursor: pointer;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  transition: transform 0.15s, box-shadow 0.4s, background 0.4s;
  box-shadow: var(--shadow);
}
.btn-start:hover { background: var(--card-strong); box-shadow: var(--glow); }
.btn-start:active { transform: scale(0.97); }
@keyframes fadeUp { to { opacity: 1; transform: translateY(0); } }

/* ============ 章节标题 ============ */
.section-label {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  color: var(--accent);
  margin-bottom: 18px;
}
.section-label::before,
.section-label::after {
  content: "";
  width: 28px;
  height: 1px;
  background: linear-gradient(90deg, var(--accent), transparent);
}
.section-label::after { background: linear-gradient(270deg, var(--accent), transparent); }

h2.section-title {
  font-size: clamp(2rem, 7vw, 3.4rem);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin-bottom: 12px;
}
.section-title .accent {
  background: linear-gradient(135deg, var(--accent-2), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.section-sub {
  color: var(--muted);
  font-size: 1.05rem;
  max-width: 60ch;
  margin-bottom: 44px;
}

/* ============ 时间轴 ============ */
.timeline {
  position: relative;
  max-width: 760px;
  margin: 0 auto;
  padding-left: 30px;
}
.timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--accent), var(--accent-2), transparent);
  opacity: 0.5;
}
.tl-item { position: relative; padding-bottom: 38px; }
.tl-item:last-child { padding-bottom: 0; }
.tl-dot {
  position: absolute;
  left: -36px;
  top: 7px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 5px rgba(201, 118, 79, 0.16), 0 0 18px rgba(201, 118, 79, 0.6);
}
.tl-card {
  background: var(--card);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 20px 22px;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: border-color 0.3s, transform 0.3s, box-shadow 0.4s;
}
.tl-card:hover { border-color: var(--border); transform: translateY(-3px); box-shadow: var(--glow); }
.tl-date {
  display: inline-block;
  font-size: 0.78rem;
  color: var(--accent);
  letter-spacing: 0.08em;
  margin-bottom: 6px;
}
.tl-title { font-size: 1.25rem; font-weight: 600; margin-bottom: 6px; }
.tl-text { color: var(--muted); font-size: 0.98rem; }

/* ============ 数字纪念册 ============ */
.numbers {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}
@media (min-width: 720px) { .numbers { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 1000px) { .numbers { grid-template-columns: repeat(4, 1fr); } }
.num-card {
  background: var(--card);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 26px 20px;
  text-align: center;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: border-color 0.3s, transform 0.3s, box-shadow 0.4s;
}
.num-card:hover { border-color: var(--border); transform: translateY(-3px); box-shadow: var(--glow); }
.num-value {
  font-size: clamp(1.8rem, 6vw, 2.8rem);
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent-2), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  line-height: 1.1;
  white-space: nowrap;
}
.num-label { margin-top: 8px; color: var(--muted); font-size: 0.9rem; }
.num-hint { display: block; margin-top: 4px; color: var(--muted); font-size: 0.72rem; opacity: 0.7; }

/* ============ 照片记忆墙（散落小照片 + 点击放大） ============ */
.photo-wall {
  position: relative;
  min-height: clamp(400px, 60vw, 560px);
  margin: 10px auto 0;
  overflow: hidden;
}
.photo-item {
  position: absolute;
  left: var(--x);
  top: var(--y);
  width: min(var(--w, 150px), 24vw);
  height: auto;
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid var(--border-soft);
  cursor: pointer;
  z-index: 1;
  background: linear-gradient(135deg, #2b3344, #1d2230);
  transform: rotate(var(--rot, 0deg));
  transition: transform 0.35s ease, box-shadow 0.4s ease, border-color 0.4s ease;
  animation: photoIn 0.8s cubic-bezier(0.22, 1, 0.36, 1) backwards;
  animation-delay: calc(var(--i, 0) * 70ms);
}
@keyframes photoIn {
  from { opacity: 0; transform: rotate(var(--rot)) translateY(16px) scale(0.94); }
  to { opacity: 1; transform: rotate(var(--rot)) translateY(0) scale(1); }
}
.photo-item:hover { transform: rotate(0deg) translateY(-4px); box-shadow: var(--glow); z-index: 3; }
.photo-item img { width: 100%; height: auto; display: block; }
.photo-item .ph-icon {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  color: var(--accent);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s;
}
.photo-item.placeholder { aspect-ratio: 3 / 4; }
.photo-item.placeholder::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 30% 20%, rgba(201,118,79,0.35), transparent 45%),
    linear-gradient(135deg, #2b3344, #1d2230);
}
.photo-item.placeholder .ph-icon { opacity: 0.55; }

/* 点击放大（lightbox） */
.photo-lightbox {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(6, 8, 14, 0.88);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  opacity: 0;
  transition: opacity 0.35s ease;
}
.photo-lightbox.open { opacity: 1; }
.photo-lightbox .lb-frame {
  position: fixed;
  border-radius: 18px;
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--glow), 0 30px 80px rgba(0,0,0,0.5);
  transform-origin: center;
  will-change: transform;
  transition: transform 0.55s cubic-bezier(0.22, 1, 0.36, 1);
}
.photo-lightbox .lb-img,
.photo-lightbox .lb-ph { width: 100%; height: 100%; object-fit: cover; display: block; }

/* ============ 专属情书 ============ */
.letter-card {
  max-width: 680px;
  margin: 0 auto;
  background: linear-gradient(135deg, rgba(255,255,255,0.06), rgba(255,255,255,0.02));
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-lg);
  padding: clamp(28px, 6vw, 56px);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: var(--shadow);
}
.letter-line {
  font-family: var(--font-hand);
  font-size: clamp(1.3rem, 5vw, 1.7rem);
  color: var(--text);
  opacity: 0;
  transform: translateY(10px);
}
.letter-line.show { opacity: 1; transform: translateY(0); transition: opacity 0.7s ease 0.1s, transform 0.7s ease 0.1s; }
.letter-line.sign { margin-top: 22px; text-align: right; color: var(--accent-2); }

/* ============ 邀请函 / 终章 ============ */
#finale { text-align: center; }
.invite-card {
  position: relative;
  max-width: 660px;
  margin: 0 auto;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: clamp(36px, 7vw, 64px);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: var(--glow);
}
.invite-title { font-size: clamp(1.9rem, 7vw, 3rem); font-weight: 600; margin-bottom: 12px; }
.invite-sub { color: var(--muted); margin-bottom: 34px; }
.invite-btns { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.btn {
  border: none;
  cursor: pointer;
  padding: 15px 34px;
  border-radius: var(--radius-pill);
  font-size: 1.05rem;
  font-family: var(--font-sans);
  transition: transform 0.15s, box-shadow 0.4s, background 0.4s;
}
.btn:active { transform: scale(0.96); }
.btn-yes {
  background: linear-gradient(135deg, var(--accent-2), var(--accent));
  color: #20110a;
  font-weight: 700;
  box-shadow: var(--glow);
}
.btn-must {
  background: var(--card-strong);
  color: var(--text);
  border: 1px solid var(--border);
  backdrop-filter: blur(10px);
}
.btn-no { background: transparent; color: var(--muted); border: 1px solid transparent; font-size: 0.9rem; }
.btn-no:hover { border-color: var(--border-soft); }
.btn-no.run-away { transition: transform 0.4s ease; }

/* ============ 终章：一周年实时倒计时 ============ */
.finale-countdown {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(8px, 2vw, 14px);
  margin: 10px auto 0;
  max-width: 760px;
}
.cd-block {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: clamp(64px, 16vw, 110px);
  padding: clamp(12px, 3vw, 24px) clamp(8px, 2vw, 18px);
  border-radius: var(--radius);
  background: var(--card);
  border: 1px solid var(--border-soft);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
.cd-num {
  font-size: clamp(2rem, 9vw, 3.8rem);
  font-weight: 700;
  line-height: 1;
  background: linear-gradient(135deg, var(--accent-2), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-variant-numeric: tabular-nums;
}
.cd-label {
  margin-top: 6px;
  color: var(--muted);
  font-size: 0.85rem;
  letter-spacing: 0.1em;
}
.cd-sep {
  font-size: clamp(1.6rem, 6vw, 2.6rem);
  font-weight: 700;
  color: var(--accent);
  opacity: 0.7;
}
.finale-note {
  margin-top: 28px;
  text-align: center;
  color: var(--muted);
  font-family: var(--font-hand);
  font-size: 1.3rem;
}

/* ============ 底部悬浮：音乐 + 倒计时 ============ */
.fab-wrap {
  position: fixed;
  left: 50%;
  transform: translateX(-50%);
  bottom: 16px;
  z-index: 50;
  display: flex;
  flex-wrap: nowrap;
  align-items: center;
  gap: 10px;
  max-width: min(640px, 96vw);
}
@media (min-width: 720px) {
  .fab-wrap { left: auto; right: 22px; transform: none; bottom: 22px; }
}
.pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  padding: 10px 15px;
  border-radius: var(--radius-pill);
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 0.9rem;
  line-height: 1;
  cursor: pointer;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: var(--shadow);
  transition: border-color 0.3s, box-shadow 0.3s;
}
.pill:hover { border-color: var(--accent); box-shadow: var(--glow); }
.pill.playing { border-color: var(--accent); box-shadow: var(--glow); }
.pill .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--muted); flex: 0 0 auto; }
.pill.playing .dot { background: var(--accent); box-shadow: 0 0 0 5px rgba(201,118,79,0.2); animation: pulse 1.4s infinite; }
@keyframes pulse {
  0%,100% { box-shadow: 0 0 0 4px rgba(201,118,79,0.18); }
  50% { box-shadow: 0 0 0 8px rgba(201,118,79,0.05); }
}
.countdown {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
  padding: 10px 14px;
  border-radius: var(--radius-pill);
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 0.82rem;
  line-height: 1;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: var(--shadow);
}
.countdown b { color: var(--accent); font-weight: 700; }

/* 右上角歌词按钮 */
.lyric-fab-wrap {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 70;
}

/* ============ 歌词小窗（液态玻璃 / Liquid Glass） ============ */
.lyric-widget {
  position: fixed;
  top: 66px;
  right: 16px;
  left: auto;
  bottom: auto;
  z-index: 60;
  width: min(340px, 86vw);
  isolation: isolate;
  overflow: hidden;
  border-radius: 22px;
  padding: 14px 22px;
  text-align: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s ease, transform 0.4s ease;
  background:
    linear-gradient(135deg, rgba(255,255,255,0.62), rgba(255,255,255,0.30)),
    rgba(255,255,255,0.42);
  border: 1px solid rgba(255,255,255,0.32);
  backdrop-filter: blur(26px) saturate(190%) contrast(1.06);
  -webkit-backdrop-filter: blur(26px) saturate(190%) contrast(1.06);
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.5),
    inset 0 -1px 0 rgba(255,255,255,0.12),
    0 18px 60px rgba(0,0,0,0.22);
}
.lyric-widget.open { opacity: 1; pointer-events: auto; }
.lq-glow {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  background:
    radial-gradient(circle at 18% 0%, rgba(255,255,255,0.55), transparent 34%),
    linear-gradient(90deg, rgba(255,255,255,0.2), transparent 44%, rgba(255,255,255,0.16));
}
.lyric-widget::after {
  content: "";
  position: absolute;
  inset: 1px;
  border-radius: inherit;
  border: 1px solid rgba(255,255,255,0.16);
  pointer-events: none;
}
.lq-inner { position: relative; z-index: 1; }
.lyric-main {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 1.05rem;
  color: #1a1c26;
  letter-spacing: 0.01em;
}
.lyric-sub {
  font-family: var(--font-hand);
  font-size: 1.15rem;
  color: #2a2d3b;
  margin-top: 4px;
  line-height: 1.4;
}
@media (min-width: 720px) {
  .lyric-widget { top: 70px; right: 20px; width: 340px; }
}
@media (prefers-reduced-transparency: reduce) {
  .lyric-widget {
    background: rgba(240,235,227,0.96);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }
  .lyric-main { color: #14171f; }
  .lyric-sub { color: #2f3240; }
}

/* ============ 页脚 ============ */
footer {
  text-align: center;
  padding: 40px 0 90px;
  color: var(--muted);
  font-size: 0.85rem;
}

/* ============ 无障碍 / 减少动效 ============ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}