/* ============================================
   诗韵 · 典雅古风样式
   ============================================ */

:root {
  /* 颜色：墨黑 + 米白 + 朱红 + 赭石 + 烟青 */
  --ink: #2a2520;
  --ink-soft: #51463d;
  --ink-light: #857866;
  --paper: #f6f1e7;
  --paper-warm: #ece3d0;
  --paper-deep: #d8c9a7;
  --cinnabar: #b94e3b;
  --cinnabar-deep: #8c2f1f;
  --ochre: #b58a4a;
  --jade: #5a7d65;
  --smoke: #3c4e6c;
  --shadow: rgba(42, 37, 32, 0.18);

  /* 字体 */
  --font-brush: 'Ma Shan Zheng', 'STKaiti', 'KaiTi', '楷体', serif;
  --font-serif: 'Noto Serif SC', 'STSong', '宋体', serif;
  --font-en: 'Cormorant Garamond', 'Noto Serif SC', serif;

  --max-w: 1200px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-serif);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.85;
  font-size: 16px;
  /* 宣纸纹理 */
  background-image:
    radial-gradient(circle at 25% 30%, rgba(180, 138, 74, 0.06) 0, transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(185, 78, 59, 0.05) 0, transparent 50%),
    repeating-linear-gradient(45deg, rgba(133, 120, 102, 0.025) 0 2px, transparent 2px 6px);
  background-attachment: fixed;
}

img, svg { max-width: 100%; display: block; }

a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }

/* ============================================
   顶部导航
   ============================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 40px;
  background: rgba(246, 241, 231, 0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(133, 120, 102, 0.25);
  box-shadow: 0 2px 12px rgba(42, 37, 32, 0.06);
}
.brand { display: flex; align-items: center; gap: 14px; color: var(--cinnabar-deep); }
.brand-seal { width: 40px; height: 40px; flex-shrink: 0; }
.brand-title {
  font-family: var(--font-brush);
  font-size: 32px;
  margin: 0;
  letter-spacing: 4px;
  color: var(--cinnabar-deep);
}
.brand-sub {
  font-size: 12px;
  letter-spacing: 6px;
  color: var(--ink-light);
  display: block;
  margin-top: 2px;
}

.site-nav { display: flex; gap: 24px; font-size: 15px; }
.site-nav a {
  position: relative;
  padding: 6px 4px;
  color: var(--ink-soft);
  transition: color 0.2s;
}
.site-nav a:hover { color: var(--cinnabar-deep); }
.site-nav a::after {
  content: "";
  position: absolute;
  bottom: 0; left: 50%;
  width: 0; height: 1px;
  background: var(--cinnabar);
  transition: all 0.3s;
}
.site-nav a:hover::after { width: 100%; left: 0; }

@media (max-width: 768px) {
  .site-header { padding: 12px 20px; }
  .site-nav { gap: 12px; font-size: 13px; }
  .brand-sub { letter-spacing: 3px; font-size: 10px; }
}

/* ============================================
   Hero
   ============================================ */
.hero {
  position: relative;
  height: 90vh;
  min-height: 560px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  overflow: hidden;
  background: linear-gradient(180deg, #0e1830 0%, #2a3550 60%, #c39770 100%);
  color: var(--paper);
}

.hero-art {
  position: absolute; inset: 0;
  z-index: 0;
}
.hero-svg { width: 100%; height: 100%; }

.hero-content {
  position: relative;
  z-index: 2;
  padding: 60px 40px 60px 80px;
  max-width: 600px;
}

.hero-title {
  font-family: var(--font-brush);
  font-size: 88px;
  letter-spacing: 12px;
  margin: 0 0 16px 0;
  line-height: 1;
  color: var(--paper);
  text-shadow: 0 4px 24px rgba(0,0,0,0.4);
}
.hero-title-zh-serif {
  display: block;
  font-family: var(--font-serif);
  font-size: 20px;
  letter-spacing: 8px;
  color: var(--paper-deep);
  margin-top: 18px;
  font-weight: 500;
  text-shadow: 0 2px 8px rgba(0,0,0,0.3);
}

.hero-tagline {
  font-size: 17px;
  letter-spacing: 3px;
  color: rgba(246, 241, 231, 0.85);
  margin: 0 0 36px 0;
}

.hero-quote {
  font-family: var(--font-brush);
  font-size: 32px;
  letter-spacing: 4px;
  margin: 24px 0;
  color: #f7e9c4;
}
.quote-mark { color: var(--cinnabar); font-size: 40px; padding: 0 6px; }

.hero-actions { display: flex; gap: 16px; }

.btn {
  border: 1px solid transparent;
  padding: 12px 28px;
  font-family: var(--font-serif);
  font-size: 15px;
  letter-spacing: 3px;
  border-radius: var(--radius-sm);
  transition: all 0.3s;
  background: transparent;
}
.btn-primary {
  background: var(--cinnabar);
  color: var(--paper);
  border-color: var(--cinnabar);
}
.btn-primary:hover {
  background: var(--cinnabar-deep);
  border-color: var(--cinnabar-deep);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(185, 78, 59, 0.45);
}
.btn-ghost {
  color: var(--paper);
  border-color: rgba(246, 241, 231, 0.5);
}
.btn-ghost:hover { background: rgba(246, 241, 231, 0.1); border-color: var(--paper); }

.hero-poems {
  position: absolute;
  right: 60px; top: 50%;
  transform: translateY(-50%);
  z-index: 2;
  background: rgba(15, 22, 38, 0.4);
  border: 1px solid rgba(246, 241, 231, 0.2);
  border-radius: var(--radius-md);
  padding: 28px 32px;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.hero-poems-label {
  font-family: var(--font-brush);
  font-size: 18px;
  letter-spacing: 6px;
  color: #f7e9c4;
  margin-bottom: 16px;
  text-align: center;
}
.hero-poems-list { list-style: none; padding: 0; margin: 0; }
.hero-poems-list li {
  display: grid;
  grid-template-columns: 36px 1fr auto;
  align-items: baseline;
  gap: 14px;
  padding: 10px 0;
  border-bottom: 1px dashed rgba(246, 241, 231, 0.15);
  color: var(--paper-warm);
}
.hero-poems-list li:last-child { border-bottom: none; }
.hp-num {
  font-family: var(--font-brush);
  color: var(--cinnabar);
  font-size: 20px;
}
.hp-title {
  font-family: var(--font-brush);
  font-size: 22px;
  letter-spacing: 3px;
}
.hp-author {
  font-size: 13px;
  color: rgba(246, 241, 231, 0.6);
  letter-spacing: 2px;
}

/* Hero 动画 */
.moon {
  transform-origin: 900px 180px;
  animation: moonGlow 4s ease-in-out infinite, floatMoon 8s ease-in-out infinite;
}
.moon-halo {
  transform-origin: 900px 180px;
  animation: moonGlow 4s ease-in-out infinite;
}
@keyframes moonGlow {
  0%, 100% { opacity: 0.12; }
  50% { opacity: 0.22; }
}
@keyframes floatMoon {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}
.bird {
  animation: birdFly 18s linear infinite;
}
.bird-2 { animation-delay: -6s; animation-duration: 22s; }
@keyframes birdFly {
  0%   { transform: translate(-200px, 0); opacity: 0; }
  10%  { opacity: 1; }
  90%  { opacity: 1; }
  100% { transform: translate(800px, -50px); opacity: 0; }
}
.mountain-1 { animation: mistShift 12s ease-in-out infinite alternate; }
.mountain-2 { animation: mistShift 14s ease-in-out infinite alternate-reverse; }
@keyframes mistShift {
  from { transform: translateX(0); }
  to { transform: translateX(20px); }
}

@media (max-width: 980px) {
  .hero {
    grid-template-columns: 1fr;
    height: auto;
    min-height: auto;
    padding-bottom: 40px;
  }
  .hero-content { padding: 80px 24px 24px; max-width: 100%; }
  .hero-poems {
    position: static;
    transform: none;
    margin: 24px;
    background: rgba(15, 22, 38, 0.55);
  }
  .hero-title { font-size: 56px; letter-spacing: 8px; }
}

/* ============================================
   通用诗篇 section
   ============================================ */
.poem-section {
  position: relative;
  padding: 100px 24px 80px;
  max-width: var(--max-w);
  margin: 0 auto;
}
.poem-section + .poem-section {
  border-top: 1px dashed rgba(133, 120, 102, 0.4);
  margin-top: 40px;
  padding-top: 80px;
}

.poem-header {
  text-align: center;
  margin-bottom: 60px;
}
.poem-num-tag {
  display: inline-block;
  font-family: var(--font-brush);
  font-size: 18px;
  letter-spacing: 6px;
  color: var(--cinnabar);
  padding: 6px 18px;
  border: 1px solid var(--cinnabar);
  border-radius: 100px;
  margin-bottom: 16px;
}
.poem-main-title {
  font-family: var(--font-brush);
  font-size: 72px;
  letter-spacing: 16px;
  margin: 16px 0 4px;
  color: var(--ink);
  text-indent: 16px;
}
.poem-subtitle {
  font-family: var(--font-serif);
  font-size: 22px;
  color: var(--ink-soft);
  letter-spacing: 4px;
  margin: 0 0 8px;
}
.poem-author {
  font-family: var(--font-serif);
  font-size: 16px;
  color: var(--ink-light);
  letter-spacing: 3px;
}
.poem-author strong { color: var(--cinnabar-deep); margin-right: 6px; }

@media (max-width: 768px) {
  .poem-main-title { font-size: 48px; letter-spacing: 8px; }
}

/* ============================================
   诗境动画区（左侧）
   ============================================ */
.poem-stage {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 48px;
  align-items: start;
  margin-bottom: 80px;
}

.poem-anim {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--paper-warm);
  aspect-ratio: 4 / 5;
  box-shadow: 0 12px 40px var(--shadow), inset 0 0 0 1px rgba(133, 120, 102, 0.2);
}

/* 各种诗境——用 CSS 渐变 + 抽象形状模拟水墨意境 */
.sky,
.art-svg {
  position: absolute; inset: 0;
  width: 100%;
  height: 100%;
}
.art-svg {
  z-index: 0;
}
.sky::after {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 0%, transparent 70%, var(--paper) 100%);
  pointer-events: none;
}

.moon-big {
  position: absolute;
  width: 100px; height: 100px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, #fefae8, #f5d77a 60%, #d8a64c 100%);
  box-shadow: 0 0 60px 10px rgba(247, 215, 122, 0.4);
  top: 12%; right: 18%;
  animation: moonRise 8s ease-in-out infinite, moonGlow2 4s ease-in-out infinite;
}
@keyframes moonRise {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}
@keyframes moonGlow2 {
  0%, 100% { box-shadow: 0 0 60px 10px rgba(247, 215, 122, 0.4); }
  50% { box-shadow: 0 0 80px 18px rgba(247, 215, 122, 0.6); }
}

.ridge {
  position: absolute;
  left: 0; right: 0;
  bottom: 0;
  height: 60%;
  background: linear-gradient(180deg, transparent 0%, rgba(31, 45, 58, 0.5) 30%, rgba(15, 26, 40, 0.85) 100%);
  clip-path: polygon(0 60%, 8% 50%, 18% 56%, 28% 38%, 42% 50%, 55% 32%, 68% 48%, 82% 35%, 92% 50%, 100% 42%, 100% 100%, 0 100%);
}

.water-surface {
  position: absolute;
  left: 0; right: 0;
  bottom: 0;
  height: 30%;
  background: linear-gradient(180deg, transparent, rgba(10, 19, 34, 0.5));
  overflow: hidden;
}
.ripple {
  position: absolute;
  left: 50%;
  bottom: 18%;
  width: 200px; height: 4px;
  border: 1px solid rgba(247, 215, 122, 0.5);
  border-radius: 50%;
  transform: translateX(-50%);
  animation: ripple 4s ease-out infinite;
}
.ripple-2 { animation-delay: 1.3s; opacity: 0.6; }
.ripple-3 { animation-delay: 2.6s; opacity: 0.4; }
@keyframes ripple {
  0%   { width: 20px; opacity: 0; }
  30%  { opacity: 0.8; }
  100% { width: 360px; opacity: 0; }
}

/* 诗境 1：静夜思（月夜霜地） */
.art-jingyesi {
  background: linear-gradient(180deg, #1a2542 0%, #2c3a5e 50%, #6b7388 80%, #b8a780 100%);
}

/* 诗境 2：登鹳雀楼（黄河日落 + 楼阁剪影） */
.art-dengguquelou {
  background: linear-gradient(180deg, #f7d27a 0%, #e88a4a 35%, #a64221 65%, #2a1916 100%);
}
.sun {
  position: absolute;
  left: 50%;
  top: 22%;
  transform: translateX(-50%);
  width: 110px; height: 110px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, #fff6db, #fbd87a 50%, #f29545 100%);
  box-shadow: 0 0 80px 24px rgba(247, 145, 69, 0.45);
}
.pavilion {
  position: absolute;
  left: 18%;
  bottom: 28%;
  width: 90px; height: 90px;
  background:
    linear-gradient(to bottom, #2a1916 60%, transparent 60%) center/100% 100% no-repeat;
}
.pavilion::before {
  content: "";
  position: absolute;
  left: -20%; top: 8%;
  width: 140%; height: 30%;
  background: var(--ink);
  clip-path: polygon(0 100%, 8% 60%, 16% 75%, 30% 40%, 45% 60%, 58% 30%, 72% 55%, 85% 35%, 95% 60%, 100% 100%);
}
.pavilion::after {
  content: "";
  position: absolute;
  left: 10%; top: 38%;
  width: 80%; height: 50%;
  background: var(--ink);
  clip-path: polygon(20% 0, 80% 0, 100% 100%, 0 100%);
}
.yellow-river {
  position: absolute;
  left: 0; right: 0;
  bottom: 0; height: 22%;
  background: linear-gradient(180deg, transparent, rgba(232, 138, 74, 0.55));
}
.yellow-river::before {
  content: "";
  position: absolute; inset: 0;
  background: repeating-linear-gradient(45deg,
    rgba(247, 210, 122, 0.3) 0 2px,
    transparent 2px 8px);
  animation: riverFlow 6s linear infinite;
}
@keyframes riverFlow {
  from { transform: translateX(0); }
  to { transform: translateX(20px); }
}

/* 诗境 3：山居秋暝（青翠空山 + 月色松林）使用 SVG，不再依赖 CSS 类 */

/* 朗诵时高亮的诗行叠层 */
.poem-anim .overlay-text {
  position: absolute;
  left: 0; right: 0;
  bottom: 8%;
  text-align: center;
  z-index: 5;
}
.poem-anim .overlay-text .line {
  font-family: var(--font-brush);
  font-size: 28px;
  letter-spacing: 8px;
  color: rgba(254, 244, 210, 0.55);
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.5);
  display: block;
  padding: 4px 0;
  transition: color 0.4s, transform 0.4s, text-shadow 0.4s;
}
.poem-anim .overlay-text .line.active {
  color: #fefae8;
  transform: scale(1.05);
  text-shadow: 0 0 20px rgba(247, 215, 122, 0.8), 0 2px 12px rgba(0, 0, 0, 0.5);
}
.poem-anim .overlay-text .line.done {
  color: rgba(254, 244, 210, 0.3);
}

.poem-anim .recital-controls {
  position: absolute;
  left: 50%; top: 18px;
  transform: translateX(-50%);
  display: flex; gap: 10px;
  z-index: 6;
}
.recital-btn {
  background: rgba(15, 22, 38, 0.65);
  border: 1px solid rgba(247, 241, 231, 0.35);
  color: var(--paper);
  padding: 8px 18px;
  border-radius: 100px;
  font-family: var(--font-serif);
  font-size: 13px;
  letter-spacing: 3px;
  display: flex; align-items: center; gap: 6px;
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  transition: all 0.3s;
}
.recital-btn:hover { background: var(--cinnabar); border-color: var(--cinnabar); }
.recital-btn.playing { background: var(--cinnabar); border-color: var(--cinnabar); }
.recital-btn .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--paper);
}
.recital-btn.playing .dot { animation: pulse 1s ease-in-out infinite; }
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.7); }
}

@media (max-width: 980px) {
  .poem-stage { grid-template-columns: 1fr; }
}

/* ============================================
   原文区（右侧）
   ============================================ */
.poem-text-block {
  background: var(--paper);
  padding: 40px 48px;
  border-radius: var(--radius-md);
  box-shadow: 0 8px 30px var(--shadow), inset 0 0 0 1px rgba(133, 120, 102, 0.15);
  position: relative;
}
.poem-text-block::before {
  content: "";
  position: absolute;
  left: 22px; top: 22px; bottom: 22px;
  width: 1px;
  background: linear-gradient(180deg, transparent, var(--cinnabar), transparent);
  opacity: 0.5;
}
.poem-prelude {
  font-family: var(--font-serif);
  font-size: 14px;
  color: var(--ink-light);
  letter-spacing: 2px;
  margin: 0 0 18px 72px;
  font-style: italic;
}
.poem-lines {
  list-style: none;
  margin: 0; padding: 0 0 0 72px;
}
.poem-lines li {
  font-family: var(--font-brush);
  font-size: 42px;
  letter-spacing: 12px;
  color: var(--ink);
  line-height: 1.6;
  padding: 4px 0;
  position: relative;
}
.poem-lines li::before {
  content: attr(data-num);
  position: absolute;
  left: -72px;
  top: 50%;
  transform: translateY(-50%);
  width: 60px;
  text-align: right;
  padding-right: 12px;
  border-right: 1px solid rgba(185, 78, 59, 0.28);
  font-family: var(--font-serif);
  font-size: 13px;
  color: var(--cinnabar);
  letter-spacing: 2px;
  opacity: 0.85;
}
.poem-translation {
  font-family: var(--font-serif);
  font-size: 15px;
  color: var(--ink-soft);
  margin: 30px 0 0 72px;
  padding-top: 24px;
  border-top: 1px dashed rgba(133, 120, 102, 0.3);
  line-height: 1.9;
}

@media (max-width: 768px) {
  .poem-text-block { padding: 28px 24px; }
  .poem-lines li { font-size: 30px; letter-spacing: 6px; }
  .poem-lines { padding-left: 56px; }
  .poem-lines li::before {
    left: -56px;
    width: 46px;
    padding-right: 8px;
    font-size: 12px;
    letter-spacing: 1px;
  }
  .poem-prelude, .poem-translation { margin-left: 56px; }
}

/* ============================================
   赏析 + 作者卡片
   ============================================ */
.poem-info {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 36px;
  margin-top: 60px;
}
.poem-analysis {
  background: var(--paper);
  padding: 36px 40px;
  border-radius: var(--radius-md);
  box-shadow: 0 8px 24px var(--shadow), inset 0 0 0 1px rgba(133, 120, 102, 0.15);
}
.poem-analysis h3 {
  font-family: var(--font-brush);
  font-size: 28px;
  letter-spacing: 8px;
  color: var(--cinnabar-deep);
  margin: 0 0 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(133, 120, 102, 0.3);
}
.poem-analysis p {
  font-size: 15.5px;
  color: var(--ink-soft);
  margin: 0 0 14px;
  text-indent: 2em;
  line-height: 2;
}
.poem-analysis .ref {
  font-size: 12px;
  color: var(--ink-light);
  font-style: italic;
  text-indent: 0;
  margin-top: 12px;
}

.poem-author-card {
  background: linear-gradient(180deg, #f9f1de 0%, var(--paper) 100%);
  padding: 30px 32px;
  border-radius: var(--radius-md);
  box-shadow: 0 8px 24px var(--shadow), inset 0 0 0 1px rgba(133, 120, 102, 0.15);
  text-align: center;
  position: relative;
}
.poem-author-card::before {
  content: "作者";
  position: absolute;
  top: 14px; left: 50%;
  transform: translateX(-50%);
  font-family: var(--font-brush);
  font-size: 14px;
  letter-spacing: 6px;
  color: var(--cinnabar);
  background: var(--paper);
  padding: 0 12px;
}
.author-avatar {
  width: 80px; height: 80px;
  margin: 18px auto 14px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--cinnabar), var(--ochre));
  color: var(--paper);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-brush);
  font-size: 40px;
  letter-spacing: 0;
  box-shadow: 0 4px 16px rgba(185, 78, 59, 0.3);
}
.author-name {
  font-family: var(--font-brush);
  font-size: 28px;
  letter-spacing: 4px;
  color: var(--ink);
  margin: 8px 0 4px;
}
.author-title-text {
  font-size: 13px;
  color: var(--cinnabar);
  letter-spacing: 3px;
  margin-bottom: 18px;
}
.author-bio {
  font-size: 14px;
  color: var(--ink-soft);
  text-align: left;
  line-height: 1.9;
  text-indent: 2em;
}

@media (max-width: 768px) {
  .poem-info { grid-template-columns: 1fr; }
}

/* ============================================
   测验区
   ============================================ */
.quiz {
  margin-top: 60px;
  background: var(--paper);
  padding: 40px;
  border-radius: var(--radius-md);
  box-shadow: 0 8px 30px var(--shadow), inset 0 0 0 1px rgba(133, 120, 102, 0.15);
  position: relative;
}
.quiz-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 12px;
}
.quiz-header h3 {
  font-family: var(--font-brush);
  font-size: 30px;
  letter-spacing: 8px;
  color: var(--cinnabar-deep);
  margin: 0;
}
.quiz-progress {
  font-family: var(--font-serif);
  font-size: 14px;
  color: var(--ink-light);
  letter-spacing: 2px;
}
.quiz-progress strong {
  font-size: 22px;
  color: var(--cinnabar-deep);
  font-family: var(--font-brush);
  margin: 0 4px;
}
.quiz-question {
  margin: 20px 0;
  padding: 24px;
  background: var(--paper-warm);
  border-left: 3px solid var(--cinnabar);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.quiz-q-title {
  font-family: var(--font-serif);
  font-size: 17px;
  color: var(--ink);
  margin: 0 0 16px;
  font-weight: 600;
}
.quiz-q-title .qno {
  font-family: var(--font-brush);
  font-size: 22px;
  color: var(--cinnabar);
  margin-right: 8px;
}
.quiz-options { list-style: none; padding: 0; margin: 0; }
.quiz-option {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  margin: 6px 0;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s;
  font-size: 15px;
  color: var(--ink-soft);
  border: 1px solid transparent;
}
.quiz-option:hover { background: rgba(185, 78, 59, 0.08); color: var(--cinnabar-deep); }
.quiz-option .opt-letter {
  width: 26px; height: 26px;
  border-radius: 50%;
  border: 1.5px solid var(--ink-light);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-serif);
  font-size: 13px;
  flex-shrink: 0;
  transition: all 0.2s;
}
.quiz-option.selected .opt-letter {
  background: var(--cinnabar);
  border-color: var(--cinnabar);
  color: var(--paper);
}
.quiz-option.selected { background: rgba(185, 78, 59, 0.1); color: var(--ink); }
.quiz-option.correct { background: rgba(90, 125, 101, 0.15); color: #2e4a36; border-color: var(--jade); }
.quiz-option.correct .opt-letter { background: var(--jade); border-color: var(--jade); color: var(--paper); }
.quiz-option.wrong { background: rgba(185, 78, 59, 0.12); color: #6b1f1f; border-color: var(--cinnabar-deep); }
.quiz-option.wrong .opt-letter { background: var(--cinnabar-deep); border-color: var(--cinnabar-deep); color: var(--paper); }
.quiz-option.locked { pointer-events: none; opacity: 0.85; }

.quiz-explain {
  margin-top: 14px;
  padding: 12px 16px;
  background: var(--paper);
  border-left: 2px solid var(--ochre);
  font-size: 13.5px;
  color: var(--ink-soft);
  line-height: 1.8;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  display: none;
}
.quiz-explain.show { display: block; }
.quiz-explain strong { color: var(--ochre); font-family: var(--font-brush); letter-spacing: 2px; }

.quiz-submit, .quiz-restart {
  display: inline-block;
  margin: 24px 12px 0 0;
  padding: 12px 32px;
  background: var(--cinnabar);
  color: var(--paper);
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font-serif);
  font-size: 15px;
  letter-spacing: 4px;
  cursor: pointer;
  transition: all 0.3s;
}
.quiz-submit:hover:not(:disabled), .quiz-restart:hover {
  background: var(--cinnabar-deep);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(185, 78, 59, 0.4);
}
.quiz-submit:disabled {
  background: var(--ink-light);
  cursor: not-allowed;
}

.quiz-result {
  display: none;
  margin-top: 24px;
  padding: 32px;
  background: linear-gradient(135deg, #f9f1de 0%, #f3e1c5 100%);
  border-radius: var(--radius-md);
  text-align: center;
  border: 1px solid var(--ochre);
}
.quiz-result.show { display: block; animation: fadeIn 0.5s; }
.quiz-result h4 {
  font-family: var(--font-brush);
  font-size: 36px;
  letter-spacing: 8px;
  color: var(--cinnabar-deep);
  margin: 0 0 12px;
}
.quiz-result .score {
  font-family: var(--font-brush);
  font-size: 56px;
  color: var(--cinnabar-deep);
  margin: 16px 0;
}
.quiz-result .score small {
  font-size: 24px;
  color: var(--ink-light);
}
.quiz-result .commentary {
  font-family: var(--font-serif);
  font-size: 16px;
  color: var(--ink-soft);
  margin: 16px 0;
  letter-spacing: 3px;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ============================================
   About + Footer
   ============================================ */
.about {
  max-width: 760px;
  margin: 80px auto 40px;
  padding: 40px;
  text-align: center;
  background: var(--paper-warm);
  border-radius: var(--radius-md);
  box-shadow: inset 0 0 0 1px rgba(133, 120, 102, 0.15);
}
.about-title {
  font-family: var(--font-brush);
  font-size: 32px;
  letter-spacing: 8px;
  color: var(--cinnabar-deep);
  margin: 0 0 20px;
}
.about p {
  color: var(--ink-soft);
  line-height: 2;
  font-size: 15px;
}
.about-foot {
  margin-top: 20px;
  font-size: 13px;
  color: var(--ink-light);
  letter-spacing: 2px;
}

.site-footer {
  text-align: center;
  padding: 30px 20px 50px;
  font-size: 13px;
  color: var(--ink-light);
  letter-spacing: 3px;
}
.footer-sep { padding: 0 12px; color: var(--ochre); }

/* ============================================
   滚动入场动画
   ============================================ */
.fade-up {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.8s, transform 0.8s;
}
.fade-up.in {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   选中文本：朱红高亮
   ============================================ */
::selection {
  background: var(--cinnabar);
  color: var(--paper);
}