/* ============================================================
   葬送の芙莉莲 · 同人站样式
   纯 CSS，无外部资源依赖
   ============================================================ */

:root {
  --violet-deep: #5b4b8a;
  --violet:      #8c79bf;
  --violet-soft: #b8a7d9;
  --violet-mist: #e7e0f3;
  --silver:      #e8e6f0;
  --paper:       #f7f4ec;
  --paper-warm:  #efe7d6;
  --ink:         #2b2640;
  --ink-soft:    #5b556e;
  --gold-dusk:   #d4a574;
  --gold-deep:   #a17042;
  --night:       #131027;
  --night-soft:  #1f1a39;
  --blue-mono:   #3e4b6e;
  --black-mono:  #16161d;
  --line:        rgba(91, 75, 138, 0.18);

  --serif: "Source Han Serif SC", "Noto Serif CJK SC", "Songti SC",
           "SimSun", "Cormorant Garamond", Georgia, serif;
  --sans:  "Source Han Sans SC", "Noto Sans CJK SC", "PingFang SC",
           "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;

  --max-w: 1080px;
  --gap:   clamp(20px, 4vw, 48px);

  --t-ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--serif);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.85;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

::selection { background: var(--violet-soft); color: var(--ink); }

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

/* ===== 滚动进度条 ===== */
.scroll-progress {
  position: fixed;
  inset: 0 0 auto 0;
  height: 2px;
  background: rgba(91, 75, 138, 0.08);
  z-index: 100;
  pointer-events: none;
}
.scroll-progress__bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--violet), var(--gold-dusk));
  transition: width 0.08s linear;
}

/* ===== 导航 ===== */
.nav {
  position: fixed;
  top: 12px; left: 50%;
  transform: translateX(-50%);
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 10px 20px;
  background: rgba(247, 244, 236, 0.78);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--line);
  border-radius: 999px;
  box-shadow: 0 6px 20px rgba(91, 75, 138, 0.08);
  font-family: var(--sans);
  font-size: 13px;
}
.nav__brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  color: var(--violet-deep);
  letter-spacing: 0.04em;
}
.nav__mark { width: 18px; height: 18px; color: var(--violet); }
.nav__list {
  list-style: none;
  display: flex;
  gap: 18px;
}
.nav__list a {
  color: var(--ink-soft);
  position: relative;
  padding: 4px 2px;
  transition: color 0.3s var(--t-ease);
}
.nav__list a:hover { color: var(--violet-deep); }
.nav__list a::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 1px;
  background: var(--violet);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 0.3s var(--t-ease);
}
.nav__list a:hover::after { transform: scaleX(1); }

@media (max-width: 640px) {
  .nav { gap: 14px; padding: 8px 14px; font-size: 12px; }
  .nav__brand span { display: none; }
  .nav__list { gap: 12px; }
}

/* ===== HERO ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 120px var(--gap) 80px;
  background:
    radial-gradient(ellipse 80% 60% at 50% 30%, rgba(231, 224, 243, 0.9), transparent 70%),
    radial-gradient(ellipse 60% 40% at 50% 100%, rgba(212, 165, 116, 0.18), transparent 70%),
    linear-gradient(180deg, #fbfaf4 0%, var(--paper) 100%);
  overflow: hidden;
}
.hero__inner {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 760px;
}
.hero__eyebrow {
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.4em;
  color: var(--violet-deep);
  text-transform: uppercase;
  margin-bottom: 24px;
  opacity: 0.85;
}
.hero__title { line-height: 1.15; margin-bottom: 36px; }
.hero__title-main {
  display: block;
  font-size: clamp(40px, 7vw, 78px);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--ink);
  text-shadow: 0 4px 24px rgba(91, 75, 138, 0.12);
}
.hero__title-sub {
  display: block;
  margin-top: 16px;
  font-size: clamp(15px, 2vw, 18px);
  font-weight: 400;
  letter-spacing: 0.4em;
  color: var(--violet-deep);
}
.hero__quote {
  position: relative;
  margin: 0 auto 36px;
  padding: 18px 0;
  font-style: italic;
  color: var(--ink-soft);
  font-size: clamp(15px, 1.8vw, 18px);
}
.hero__quote p { line-height: 1.7; }
.hero__quote::before, .hero__quote::after {
  content: "";
  display: block;
  width: 60px; height: 1px;
  background: var(--violet-soft);
  margin: 12px auto;
}
.hero__quote cite {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  letter-spacing: 0.2em;
  font-style: normal;
  opacity: 0.7;
}
.hero__lede {
  color: var(--ink-soft);
  font-size: clamp(14px, 1.6vw, 16px);
  line-height: 2;
  margin-bottom: 48px;
}
.hero__scroll {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border: 1px solid var(--violet-soft);
  border-radius: 999px;
  font-family: var(--sans);
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--violet-deep);
  background: rgba(255, 255, 255, 0.5);
  transition: all 0.4s var(--t-ease);
}
.hero__scroll:hover {
  background: var(--violet-deep);
  color: #fff;
  border-color: var(--violet-deep);
  transform: translateY(-2px);
}
.hero__scroll svg { animation: float-down 2.4s ease-in-out infinite; }
@keyframes float-down {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(4px); }
}

/* 飘落花瓣 */
.hero__petals {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 1;
}
.petal {
  position: absolute;
  top: -8%;
  width: 14px; height: 14px;
  background: radial-gradient(circle at 30% 30%, #d6c5ec, #8c79bf 80%);
  border-radius: 60% 40% 60% 40% / 50% 60% 40% 50%;
  opacity: 0.55;
  animation: petal-fall linear infinite;
  filter: blur(0.4px);
}
@keyframes petal-fall {
  0%   { transform: translate(0, -10vh) rotate(0deg); opacity: 0; }
  10%  { opacity: 0.7; }
  90%  { opacity: 0.5; }
  100% { transform: translate(60px, 110vh) rotate(720deg); opacity: 0; }
}
.petal.p1 { left:  8%; animation-duration: 18s; animation-delay: 0s;   width: 10px; height: 10px; }
.petal.p2 { left: 18%; animation-duration: 22s; animation-delay: -3s;  width: 14px; height: 14px; }
.petal.p3 { left: 28%; animation-duration: 16s; animation-delay: -7s;  width: 12px; height: 12px; }
.petal.p4 { left: 40%; animation-duration: 24s; animation-delay: -1s;  width: 16px; height: 16px; }
.petal.p5 { left: 52%; animation-duration: 20s; animation-delay: -10s; width: 11px; height: 11px; }
.petal.p6 { left: 64%; animation-duration: 26s; animation-delay: -4s;  width: 14px; height: 14px; }
.petal.p7 { left: 74%; animation-duration: 19s; animation-delay: -12s; width: 10px; height: 10px; }
.petal.p8 { left: 84%; animation-duration: 23s; animation-delay: -6s;  width: 13px; height: 13px; }
.petal.p9 { left: 92%; animation-duration: 21s; animation-delay: -9s;  width: 11px; height: 11px; }

/* ===== 章节通用 ===== */
.chapter {
  position: relative;
  padding: clamp(80px, 12vh, 140px) var(--gap);
  max-width: var(--max-w);
  margin: 0 auto;
}
.chapter__head { text-align: center; margin-bottom: 64px; }
.chapter__num {
  display: inline-block;
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.5em;
  color: var(--violet);
  padding-bottom: 14px;
  position: relative;
  margin-bottom: 16px;
}
.chapter__num::after {
  content: "";
  position: absolute;
  left: 50%; bottom: 0;
  transform: translateX(-50%);
  width: 36px; height: 1px;
  background: var(--violet-soft);
}
.chapter__title {
  font-size: clamp(28px, 4.5vw, 44px);
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--ink);
  margin-bottom: 18px;
}
.chapter__lede {
  font-size: clamp(14px, 1.6vw, 16px);
  color: var(--ink-soft);
  max-width: 580px;
  margin: 0 auto;
  line-height: 2;
  font-style: italic;
  opacity: 0.9;
}
.chapter__coda {
  margin-top: 56px;
  text-align: center;
  font-size: clamp(15px, 1.7vw, 18px);
  color: var(--violet-deep);
  line-height: 2.2;
  letter-spacing: 0.06em;
  font-style: italic;
}
.chapter__head--light .chapter__title,
.chapter__head--light .chapter__num { color: var(--silver); }
.chapter__head--light .chapter__lede { color: rgba(232, 230, 240, 0.78); }
.chapter__coda--light { color: var(--violet-soft); }

/* 章节间装饰分隔 */
.chapter + .chapter::before {
  content: "❀";
  display: block;
  text-align: center;
  color: var(--violet-soft);
  font-size: 14px;
  margin-bottom: 24px;
  opacity: 0.6;
}

/* ===== 第一章 双重 ===== */
.chapter--duo .duo {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 32px;
  align-items: stretch;
}
.duo__card {
  position: relative;
  padding: 36px 32px;
  border-radius: 4px;
  background: linear-gradient(180deg, #fff 0%, var(--paper) 100%);
  border: 1px solid var(--line);
  transition: transform 0.5s var(--t-ease), box-shadow 0.5s var(--t-ease);
}
.duo__card:hover {
  transform: translateY(-4px);
  box-shadow: 0 18px 40px rgba(91, 75, 138, 0.10);
}
.duo__card header { margin-bottom: 18px; }
.duo__tag {
  display: inline-block;
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: 0.3em;
  padding: 4px 10px;
  border: 1px solid;
  border-radius: 2px;
  margin-bottom: 14px;
}
.duo__card h3 {
  font-size: 24px;
  font-weight: 600;
  letter-spacing: 0.1em;
}
.duo__card p {
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 2.1;
}
.duo__card--blue {
  --accent: var(--blue-mono);
  border-top: 3px solid var(--blue-mono);
}
.duo__card--blue .duo__tag,
.duo__card--blue h3 { color: var(--blue-mono); }
.duo__card--blue .duo__tag { border-color: var(--blue-mono); }

.duo__card--black {
  --accent: var(--black-mono);
  border-top: 3px solid var(--black-mono);
}
.duo__card--black .duo__tag,
.duo__card--black h3 { color: var(--black-mono); }
.duo__card--black .duo__tag { border-color: var(--black-mono); }

.duo__divider {
  display: flex;
  align-items: center;
  justify-content: center;
}
.duo__rune {
  width: 56px; height: 56px;
  border-radius: 50%;
  border: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  color: var(--violet-deep);
  background: #fff;
  letter-spacing: normal;
}

@media (max-width: 720px) {
  .chapter--duo .duo {
    grid-template-columns: 1fr;
  }
  .duo__divider { padding: 8px 0; }
}

/* ===== 第二章 时间轴 ===== */
.timeline { margin-bottom: 64px; }
.timeline__rail {
  position: relative;
  height: 4px;
  background: var(--violet-mist);
  border-radius: 2px;
  margin: 56px 0 18px;
}
.timeline__decade {
  position: absolute;
  left: 99%;
  transform: translateX(-100%);
  top: -3px;
  width: 1%;
  min-width: 8px;
  height: 10px;
  background: linear-gradient(90deg, var(--gold-dusk), var(--violet-deep));
  border-radius: 2px;
  box-shadow: 0 0 14px var(--gold-dusk);
}
.timeline__tick {
  position: absolute;
  left: var(--p);
  top: -32px;
  transform: translateX(-50%);
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--ink-soft);
  white-space: nowrap;
}
.timeline__tick::after {
  content: "";
  display: block;
  width: 1px;
  height: 14px;
  background: var(--violet);
  margin: 6px auto 0;
}
.timeline__labels {
  display: flex;
  justify-content: space-between;
  font-family: var(--sans);
  font-size: 12px;
  color: var(--ink-soft);
  letter-spacing: 0.2em;
}
.timeline__highlight {
  color: var(--gold-deep);
  font-weight: 600;
}
.time-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.time-card {
  padding: 28px 24px;
  background: #fff;
  border-radius: 4px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--violet);
}
.time-card h3 {
  font-size: 19px;
  font-weight: 600;
  color: var(--violet-deep);
  margin-bottom: 14px;
  letter-spacing: 0.05em;
}
.time-card p {
  color: var(--ink-soft);
  font-size: 14.5px;
  line-height: 2;
}
@media (max-width: 820px) {
  .time-grid { grid-template-columns: 1fr; }
}

/* ===== 第三章 花田闭环 ===== */
.chapter--field {
  background:
    radial-gradient(ellipse 70% 50% at 50% 50%, rgba(184, 167, 217, 0.10), transparent 70%),
    var(--paper);
  max-width: none;
  margin: 0;
  padding-left: 0;
  padding-right: 0;
}
.chapter--field > * { max-width: var(--max-w); margin-left: auto; margin-right: auto; padding-left: var(--gap); padding-right: var(--gap); }
.chapter--field > .chapter__head { padding-left: var(--gap); padding-right: var(--gap); }

.loop {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  counter-reset: bloom;
  position: relative;
}
.loop::before {
  content: "";
  position: absolute;
  top: 60px;
  left: 8%;
  right: 8%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--violet-soft) 20%, var(--violet-soft) 80%, transparent);
  z-index: 0;
}
.loop__node {
  position: relative;
  text-align: center;
  padding: 0 8px;
  counter-increment: bloom;
}
.loop__bloom {
  width: 84px; height: 84px;
  margin: 0 auto 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(circle, #fff 60%, var(--violet-mist) 100%);
  border-radius: 50%;
  border: 1px solid var(--violet-soft);
  position: relative;
  z-index: 1;
  transition: transform 0.6s var(--t-ease), box-shadow 0.6s var(--t-ease);
}
.loop__bloom::before {
  content: counter(bloom, decimal-leading-zero);
  position: absolute;
  top: -16px;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--violet);
}
.loop__bloom svg {
  width: 60%; height: 60%;
  opacity: 0.85;
  transition: transform 1s var(--t-ease);
}
.loop__node.in-view .loop__bloom {
  transform: scale(1.04);
  box-shadow: 0 8px 28px rgba(140, 121, 191, 0.30);
}
.loop__node.in-view .loop__bloom svg {
  transform: rotate(360deg);
}
.loop__node h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--violet-deep);
  margin-bottom: 12px;
  letter-spacing: 0.05em;
}
.loop__node p {
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.9;
}
@media (max-width: 820px) {
  .loop { grid-template-columns: repeat(2, 1fr); }
  .loop::before { display: none; }
}
@media (max-width: 480px) {
  .loop { grid-template-columns: 1fr; }
}

/* ===== 第四章 笨拙的温柔 ===== */
.evidence {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}
.evidence__card {
  position: relative;
  padding: 36px 32px;
  background: linear-gradient(160deg, #fff 0%, #faf6ee 100%);
  border-radius: 4px;
  border: 1px solid var(--line);
  border-bottom: 3px solid var(--violet-soft);
  transition: transform 0.5s var(--t-ease), border-color 0.5s var(--t-ease);
}
.evidence__card:hover {
  transform: translateY(-6px);
  border-bottom-color: var(--gold-dusk);
}
.evidence__icon {
  width: 56px; height: 56px;
  color: var(--violet-deep);
  margin-bottom: 22px;
  opacity: 0.85;
}
.evidence__card h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 14px;
  letter-spacing: 0.08em;
}
.evidence__card p {
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 2.05;
}
@media (max-width: 720px) {
  .evidence { grid-template-columns: 1fr; }
}

/* ===== 第五章 哀而不伤 ===== */
.chapter--mono {
  background:
    linear-gradient(180deg, var(--paper) 0%, var(--paper-warm) 100%);
  max-width: none;
  margin: 0;
  padding-left: 0;
  padding-right: 0;
}
.chapter--mono > * { max-width: var(--max-w); margin-left: auto; margin-right: auto; padding-left: var(--gap); padding-right: var(--gap); }

.mono {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  position: relative;
}
.mono::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 20px; bottom: 20px;
  width: 1px;
  background: linear-gradient(180deg, transparent, var(--violet-soft), transparent);
}
.mono__col h3 {
  font-size: 22px;
  font-weight: 600;
  color: var(--violet-deep);
  margin-bottom: 24px;
  letter-spacing: 0.06em;
  position: relative;
  padding-left: 16px;
}
.mono__col h3::before {
  content: "";
  position: absolute;
  left: 0; top: 50%;
  transform: translateY(-50%);
  width: 4px; height: 18px;
  background: var(--gold-dusk);
}
.mono__col p {
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 2.15;
  margin-bottom: 20px;
}
.mono__hint {
  font-style: italic;
  color: var(--violet-deep) !important;
  border-left: 2px solid var(--violet-soft);
  padding-left: 14px;
}
@media (max-width: 820px) {
  .mono { grid-template-columns: 1fr; gap: 40px; }
  .mono::before { display: none; }
}

/* ===== 第六章 群星 ===== */
.chapter--stars {
  position: relative;
  background: linear-gradient(180deg, var(--night) 0%, var(--night-soft) 50%, #2a2342 100%);
  color: var(--silver);
  max-width: none;
  margin: 0;
  padding-left: 0;
  padding-right: 0;
  overflow: hidden;
}
.chapter--stars > * { max-width: var(--max-w); margin-left: auto; margin-right: auto; padding-left: var(--gap); padding-right: var(--gap); position: relative; z-index: 2; }

.stars__bg {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(2px 2px at 10% 20%, #fff, transparent),
    radial-gradient(1.5px 1.5px at 22% 65%, #fff, transparent),
    radial-gradient(2px 2px at 35% 35%, #ffe6b3, transparent),
    radial-gradient(1.5px 1.5px at 48% 80%, #fff, transparent),
    radial-gradient(2px 2px at 60% 18%, #fff, transparent),
    radial-gradient(1.5px 1.5px at 72% 55%, #d6c5ec, transparent),
    radial-gradient(2px 2px at 85% 25%, #fff, transparent),
    radial-gradient(1.5px 1.5px at 92% 70%, #fff, transparent),
    radial-gradient(1px 1px at 15% 88%, #fff, transparent),
    radial-gradient(1px 1px at 55% 50%, #fff, transparent),
    radial-gradient(1px 1px at 78% 88%, #fff, transparent),
    radial-gradient(1px 1px at 30% 10%, #fff, transparent),
    radial-gradient(1px 1px at 67% 92%, #fff, transparent);
  background-size: 100% 100%;
  opacity: 0.85;
  z-index: 1;
}
.stars__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 50% 40% at 20% 30%, rgba(212, 165, 116, 0.10), transparent 60%),
    radial-gradient(ellipse 60% 50% at 80% 70%, rgba(184, 167, 217, 0.12), transparent 60%);
  animation: starfield-pulse 12s ease-in-out infinite alternate;
}
@keyframes starfield-pulse {
  from { opacity: 0.7; }
  to   { opacity: 1;   }
}

.stars {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.star-card {
  position: relative;
  padding: 36px 28px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(232, 230, 240, 0.12);
  border-radius: 4px;
  backdrop-filter: blur(4px);
  overflow: hidden;
  transition: transform 0.5s var(--t-ease), border-color 0.5s var(--t-ease);
}
.star-card:hover { transform: translateY(-6px); border-color: var(--violet-soft); }
.star-card__glow {
  position: absolute;
  top: -40px; right: -40px;
  width: 140px; height: 140px;
  border-radius: 50%;
  filter: blur(40px);
  opacity: 0.5;
}
.star-card--sun  .star-card__glow { background: var(--gold-dusk); }
.star-card--dusk .star-card__glow { background: #c08a5a; opacity: 0.35; }
.star-card--stars .star-card__glow { background: var(--violet-soft); opacity: 0.4; }

.star-card h3 {
  font-size: 22px;
  font-weight: 600;
  color: var(--silver);
  margin-bottom: 6px;
  letter-spacing: 0.08em;
  position: relative;
}
.star-card__sub {
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.3em;
  color: var(--violet-soft);
  margin-bottom: 18px;
  position: relative;
}
.star-card p:not(.star-card__sub) {
  font-size: 14.5px;
  color: rgba(232, 230, 240, 0.82);
  line-height: 2;
  position: relative;
}
@media (max-width: 820px) {
  .stars { grid-template-columns: 1fr; }
}

/* ===== 尾声 Anytime Anywhere ===== */
.chapter--ed {
  background: linear-gradient(180deg, #2a2342 0%, #3d3556 30%, #6b5d7e 70%, var(--paper-warm) 100%);
  max-width: none;
  margin: 0;
  padding-left: 0;
  padding-right: 0;
  color: var(--silver);
}
.chapter--ed > * { max-width: var(--max-w); margin-left: auto; margin-right: auto; padding-left: var(--gap); padding-right: var(--gap); }
.chapter--ed .chapter__title { color: var(--silver); }
.chapter--ed .chapter__num { color: var(--gold-dusk); }
.chapter--ed .chapter__num::after { background: var(--gold-dusk); }
.chapter--ed .chapter__lede { color: rgba(232, 230, 240, 0.78); }

.lyrics {
  max-width: 640px;
  margin: 0 auto 56px;
  text-align: center;
}
.lyrics__stanza {
  margin-bottom: 36px;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 1s var(--t-ease), transform 1s var(--t-ease);
}
.lyrics.in-view .lyrics__stanza { opacity: 1; transform: translateY(0); }
.lyrics.in-view .lyrics__stanza:nth-child(1) { transition-delay: 0.0s; }
.lyrics.in-view .lyrics__stanza:nth-child(2) { transition-delay: 0.4s; }
.lyrics.in-view .lyrics__stanza:nth-child(3) { transition-delay: 0.8s; }
.lyrics.in-view .lyrics__stanza:nth-child(4) { transition-delay: 1.2s; }

.lyrics .ja {
  font-family: "Hiragino Mincho ProN", "Yu Mincho", var(--serif);
  font-size: clamp(16px, 2.2vw, 19px);
  color: #fff;
  letter-spacing: 0.06em;
  line-height: 2;
}
.lyrics .zh {
  margin-top: 8px;
  font-size: 14px;
  color: rgba(232, 230, 240, 0.78);
  font-style: italic;
  letter-spacing: 0.04em;
}

.closing {
  text-align: center;
  font-style: italic;
  font-size: clamp(15px, 1.8vw, 18px);
  line-height: 2.2;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.6);
  padding: 36px 28px;
  border-radius: 4px;
  border-top: 2px solid var(--violet-deep);
  border-bottom: 2px solid var(--gold-dusk);
  max-width: 640px;
  margin: 0 auto;
}
.closing p { margin-bottom: 6px; }
.closing__final {
  margin-top: 18px !important;
  color: var(--violet-deep);
  font-weight: 600;
}

/* ===== Footer ===== */
.foot {
  text-align: center;
  padding: 64px var(--gap) 80px;
  background: var(--paper-warm);
  color: var(--ink-soft);
  font-family: var(--sans);
  font-size: 13px;
  line-height: 2.2;
  letter-spacing: 0.06em;
}
.foot__line { font-size: 13.5px; }
.foot__meta {
  margin-top: 10px;
  font-size: 12px;
  color: var(--ink-soft);
  opacity: 0.75;
}
.foot__sign {
  margin-top: 20px;
  font-family: var(--serif);
  font-style: italic;
  color: var(--violet-deep);
  font-size: 14.5px;
}

/* ===== 回到顶部按钮 ===== */
.top-btn {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 44px; height: 44px;
  border-radius: 50%;
  border: 1px solid var(--violet-soft);
  background: rgba(255, 255, 255, 0.92);
  color: var(--violet-deep);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 20px rgba(91, 75, 138, 0.18);
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  transition: all 0.4s var(--t-ease);
  z-index: 40;
}
.top-btn.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}
.top-btn:hover {
  background: var(--violet-deep);
  color: #fff;
}

/* ===== 通用进场动画 ===== */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.9s var(--t-ease), transform 0.9s var(--t-ease);
}
.reveal.in-view {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .reveal, .lyrics__stanza { opacity: 1 !important; transform: none !important; }
  .petal, .hero__scroll svg { animation: none !important; }
}