/* ═══════════════════════════════════════════════════════════
   fanren.css — 《凡人修仙传》同人长卷 · 红尘问仙
   嵌入首页欢迎页之后，以长滚动方式展开六段姻缘
   风格：水墨 × 玻璃 × 朱砂鎏金（继承 redesign.css 变量）
   ═══════════════════════════════════════════════════════════ */

:root {
  --fr-ink: #0a0c08;
  --fr-paper: #ece5d8;
  --fr-cinnabar: #c45a4a;
  --fr-gold: #c9b08a;
  --fr-jade: #7e9c8e;
  --fr-line: rgba(201, 176, 138, 0.28);
  --fr-glass: rgba(16, 20, 15, 0.58);
}

/* ── 0. 长卷容器：解除 .section 的 100vh 居中限制 ── */
.section-fanren {
  position: relative;
  display: block;
  min-height: auto;
  width: 100%;
  padding: 0;
  overflow: clip;
  /* 完全透明：让全局动态背景自然透出，不设任何全屏叠加层 */
  background: transparent;
  isolation: isolate;
}

.section-fanren * {
  box-sizing: border-box;
}

/* ── 1. 卷首 ── */
.fr-prologue {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 94vh;
  padding: clamp(80px, 14vh, 180px) 24px;
  text-align: center;
  overflow: hidden;
}



.fr-prologue-inner {
  position: relative;
  z-index: 3;
  max-width: 760px;
}

.fr-eyebrow {
  font-family: var(--font-display, 'Cinzel', serif);
  font-size: 0.66rem;
  letter-spacing: 0.5em;
  color: rgba(201, 176, 138, 0.75);
  text-transform: uppercase;
  margin-bottom: 26px;
}

.fr-mega {
  display: flex;
  flex-direction: column;
  gap: 0.08em;
  font-family: var(--font-serif);
  font-size: clamp(3.2rem, 13vw, 7rem);
  font-weight: 700;
  line-height: 0.98;
  letter-spacing: 0.12em;
  color: var(--fr-paper);
  text-shadow: 0 6px 40px rgba(0, 0, 0, 0.55), 0 0 60px rgba(196, 90, 74, 0.12);
}

.fr-mega span:last-child {
  color: transparent;
  -webkit-text-stroke: 1.5px rgba(236, 229, 216, 0.85);
  text-stroke: 1.5px rgba(236, 229, 216, 0.85);
  letter-spacing: 0.22em;
  font-size: 0.62em;
}

.fr-sub {
  margin-top: 22px;
  font-size: clamp(0.9rem, 2.6vw, 1.1rem);
  letter-spacing: 0.42em;
  color: var(--fr-jade);
  text-shadow: 0 2px 16px rgba(0, 0, 0, 0.7);
}

.fr-verse {
  margin-top: 10px;
  font-family: var(--font-serif);
  font-size: clamp(0.95rem, 2.6vw, 1.14rem);
  letter-spacing: 0.2em;
  color: rgba(236, 229, 216, 0.82);
}

.fr-verse:nth-of-type(2) {
  color: var(--fr-cinnabar);
}

.fr-note {
  margin-top: 30px;
  font-size: 0.74rem;
  letter-spacing: 0.24em;
  color: rgba(236, 229, 216, 0.42);
}

.fr-scrollcue {
  margin-top: 40px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 28px;
  font-family: var(--font-serif);
  font-size: 0.82rem;
  letter-spacing: 0.3em;
  color: rgba(236, 229, 216, 0.86);
  background: rgba(201, 176, 138, 0.06);
  border: 1px solid var(--fr-line);
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.45s var(--ease-silk, ease);
  -webkit-tap-highlight-color: transparent;
}

.fr-scrollcue span {
  font-size: 0.9rem;
  animation: frBob 2.2s ease-in-out infinite;
}

.fr-scrollcue:hover {
  color: var(--fr-paper);
  border-color: rgba(196, 90, 74, 0.5);
  background: rgba(196, 90, 74, 0.1);
  transform: translateY(-2px);
  box-shadow: 0 12px 34px rgba(0, 0, 0, 0.4), 0 0 22px rgba(196, 90, 74, 0.12);
}

@keyframes frBob {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(4px); }
}

/* ── 2. 章节 ── */
.fr-chapters {
  position: relative;
  z-index: 2;
}

.fr-chapter {
  position: relative;
  display: flex;
  align-items: center;
  min-height: 100vh;
  padding: clamp(72px, 12vh, 140px) clamp(20px, 5vw, 72px);
  overflow: hidden;
}

.fr-chapter-inner {
  position: relative;
  z-index: 3;
  display: flex;
  align-items: center;
  gap: clamp(24px, 5vw, 72px);
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
}

.fr-chapter:nth-child(even) .fr-chapter-inner {
  flex-direction: row-reverse;
}

.fr-chapter-head {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  min-width: 132px;
}

.fr-index {
  font-family: var(--font-display, 'Cinzel', serif);
  font-size: 0.72rem;
  letter-spacing: 0.42em;
  color: var(--fr-cinnabar);
}

.fr-name {
  writing-mode: vertical-rl;
  text-orientation: upright;
  font-family: var(--font-serif);
  font-size: clamp(2.1rem, 5.4vw, 3.4rem);
  font-weight: 600;
  letter-spacing: 0.24em;
  color: var(--fr-paper);
  text-shadow: 0 4px 30px rgba(0, 0, 0, 0.55);
}

.fr-realm {
  font-size: 0.68rem;
  letter-spacing: 0.24em;
  color: rgba(126, 156, 142, 0.85);
  writing-mode: vertical-rl;
}

.fr-card {
  position: relative;
  flex: 1 1 auto;
  max-width: 640px;
  padding: clamp(26px, 4vw, 44px);
  background: rgba(9, 12, 9, 0.7);
  border: 1px solid var(--fr-line);
  border-radius: 22px;
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.45), inset 0 1px 0 rgba(236, 229, 216, 0.05);
  overflow: hidden;
  opacity: 0;
  transform: translateY(48px);
  transition: opacity 0.9s var(--ease-silk, ease), transform 0.9s var(--ease-silk, ease);
}

.fr-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 2px;
  height: 100%;
  background: linear-gradient(180deg, transparent, var(--fr-cinnabar) 22%, var(--fr-gold) 62%, transparent);
  opacity: 0.7;
}

.fr-chapter.is-visible .fr-card {
  opacity: 1;
  transform: translateY(0);
}

.fr-poem {
  font-family: var(--font-serif);
  font-size: clamp(0.98rem, 2.6vw, 1.16rem);
  letter-spacing: 0.12em;
  color: var(--fr-gold);
  margin-bottom: 18px;
}

.fr-text {
  font-size: clamp(0.88rem, 2.4vw, 1rem);
  line-height: 2.05;
  letter-spacing: 0.06em;
  color: rgba(236, 229, 216, 0.8);
}

.fr-acts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(128px, 1fr));
  gap: 10px;
  margin-top: 26px;
  padding-top: 22px;
  border-top: 1px solid rgba(236, 229, 216, 0.08);
}

.fr-acts span {
  position: relative;
  padding: 9px 12px;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: rgba(236, 229, 216, 0.66);
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid rgba(236, 229, 216, 0.07);
  border-radius: 10px;
  text-align: center;
}

.fr-acts span::before {
  content: '';
  position: absolute;
  top: -1px;
  left: 12px;
  width: 16px;
  height: 1px;
  background: var(--fr-cinnabar);
}

.fr-more {
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px dashed rgba(201, 176, 138, 0.22);
  font-size: 0.86rem;
  line-height: 2;
  letter-spacing: 0.05em;
  color: rgba(236, 229, 216, 0.72);
}

.fr-more[hidden] {
  display: none;
}

.fr-more p + p {
  margin-top: 10px;
}

.fr-toggle {
  margin-top: 22px;
  padding: 8px 18px;
  font-family: var(--font-serif);
  font-size: 0.74rem;
  letter-spacing: 0.24em;
  color: rgba(236, 229, 216, 0.72);
  background: transparent;
  border: 1px solid rgba(236, 229, 216, 0.16);
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.4s var(--ease-silk, ease);
}

.fr-toggle:hover {
  color: var(--fr-paper);
  border-color: rgba(196, 90, 74, 0.5);
  background: rgba(196, 90, 74, 0.08);
}

.fr-seal {
  position: absolute;
  right: clamp(8px, 3vw, 28px);
  bottom: clamp(14px, 4vh, 40px);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 54px;
  height: 54px;
  font-family: var(--font-serif);
  font-size: 1.5rem;
  color: #f3ece0;
  background: rgba(196, 90, 74, 0.82);
  border-radius: 8px;
  box-shadow: 0 10px 30px rgba(196, 90, 74, 0.28);
  transform: rotate(-6deg);
  opacity: 0;
  transition: opacity 1s ease 0.3s, transform 1s var(--ease-spring, ease) 0.3s;
}

.fr-chapter.is-visible .fr-seal {
  opacity: 0.92;
  transform: rotate(-6deg) translateY(0);
}

/* ── 3. 右侧卷轴进度 ── */
.fr-rail {
  position: fixed;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 520;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.6s ease;
}

.fr-rail.is-active {
  opacity: 1;
  pointer-events: auto;
}

.fr-rail-label {
  writing-mode: vertical-rl;
  font-size: 0.62rem;
  letter-spacing: 0.34em;
  color: rgba(201, 176, 138, 0.72);
}

.fr-rail-track {
  position: relative;
  width: 2px;
  height: 180px;
  background: rgba(236, 229, 216, 0.12);
  border-radius: 2px;
  overflow: hidden;
}

.fr-rail-fill {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 0;
  background: linear-gradient(180deg, var(--fr-cinnabar), var(--fr-gold));
  box-shadow: 0 0 12px rgba(196, 90, 74, 0.5);
}

.fr-rail-dots {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.fr-rail-dot {
  width: 7px;
  height: 7px;
  padding: 0;
  border: 1px solid rgba(201, 176, 138, 0.5);
  border-radius: 50%;
  background: transparent;
  cursor: pointer;
  transition: all 0.35s ease;
}

.fr-rail-dot.is-on {
  background: var(--fr-cinnabar);
  border-color: var(--fr-cinnabar);
  box-shadow: 0 0 10px rgba(196, 90, 74, 0.6);
  transform: scale(1.25);
}

/* ── 4. 飘落花瓣 ── */
.fr-petals {
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  overflow: hidden;
}

.fr-petal {
  position: absolute;
  top: -20px;
  width: 7px;
  height: 7px;
  background: rgba(236, 229, 216, 0.5);
  border-radius: 60% 0 60% 0;
  opacity: 0;
  animation: frFall linear infinite;
  will-change: transform;
}

@keyframes frFall {
  0% { transform: translate3d(0, -10vh, 0) rotate(0deg); opacity: 0; }
  12% { opacity: 0.65; }
  88% { opacity: 0.45; }
  100% { transform: translate3d(var(--fr-drift, 40px), 110vh, 0) rotate(420deg); opacity: 0; }
}

/* ── 5. 卷尾 · 星图 ── */
.fr-finale {
  position: relative;
  z-index: 3;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 88vh;
  padding: clamp(72px, 12vh, 150px) 24px;
  text-align: center;
}

.fr-stars {
  position: relative;
  width: min(420px, 82vw);
  height: min(220px, 44vw);
  margin-bottom: 34px;
}

.fr-stars svg {
  width: 100%;
  height: 100%;
  overflow: visible;
}

.fr-star-line {
  stroke: rgba(201, 176, 138, 0.28);
  stroke-width: 0.6;
  stroke-dasharray: 2 4;
  fill: none;
}

.fr-star-node {
  fill: rgba(236, 229, 216, 0.85);
  transition: fill 0.4s ease, r 0.4s ease;
}

.fr-star-node.is-lit {
  fill: var(--fr-cinnabar);
  filter: drop-shadow(0 0 6px rgba(196, 90, 74, 0.7));
}

.fr-star-name {
  font-family: var(--font-serif);
  font-size: 10px;
  letter-spacing: 0.18em;
  fill: rgba(236, 229, 216, 0.5);
}

.fr-finale-line {
  font-size: clamp(0.9rem, 2.6vw, 1.05rem);
  letter-spacing: 0.22em;
  color: rgba(236, 229, 216, 0.66);
  text-shadow: 0 2px 14px rgba(0, 0, 0, 0.7);
}

.fr-finale-line--main {
  margin-top: 10px;
  font-family: var(--font-serif);
  font-size: clamp(1.3rem, 4.4vw, 2rem);
  letter-spacing: 0.3em;
  color: var(--fr-paper);
  text-shadow: 0 3px 20px rgba(0, 0, 0, 0.7);
}

.fr-finale-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
  margin-top: 40px;
}

.fr-btn {
  padding: 11px 26px;
  font-family: var(--font-serif);
  font-size: 0.78rem;
  letter-spacing: 0.26em;
  color: rgba(236, 229, 216, 0.82);
  background: rgba(201, 176, 138, 0.05);
  border: 1px solid var(--fr-line);
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.42s var(--ease-silk, ease);
}

.fr-btn:hover {
  color: var(--fr-paper);
  border-color: rgba(196, 90, 74, 0.5);
  background: rgba(196, 90, 74, 0.1);
  transform: translateY(-2px);
}

/* ── 6. 响应式 ── */
@media (max-width: 860px) {
  .fr-chapter {
    min-height: auto;
    padding: 68px 20px;
  }

  .fr-chapter-inner,
  .fr-chapter:nth-child(even) .fr-chapter-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .fr-chapter-head {
    flex-direction: row;
    align-items: baseline;
    gap: 14px;
    min-width: 0;
  }

  .fr-name {
    writing-mode: horizontal-tb;
    text-orientation: mixed;
    font-size: 2rem;
    letter-spacing: 0.16em;
  }

  .fr-realm {
    writing-mode: horizontal-tb;
  }

  .fr-card {
    max-width: 100%;
  }

  .fr-rail {
    right: 8px;
  }

  .fr-rail-track {
    height: 120px;
  }

  .fr-mega span:last-child {
    font-size: 0.55em;
  }
}

@media (max-width: 520px) {
  .fr-prologue {
    min-height: 86vh;
  }

  .fr-seal {
    width: 44px;
    height: 44px;
    font-size: 1.2rem;
    right: 12px;
    bottom: 12px;
  }

  .fr-acts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .fr-rail {
    display: none;
  }

  .fr-text {
    line-height: 1.95;
  }
}

/* ── 7. 无障碍与降级 ── */
@media (prefers-reduced-motion: reduce) {

  .fr-petal {
    display: none;
  }

  .fr-card {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .fr-seal {
    opacity: 0.92;
    transform: rotate(-6deg);
  }
}

/* 老浏览器兜底：即使 JS 未执行，内容也可见 */
.no-js .fr-card {
  opacity: 1;
  transform: none;
}