/* ====== 古风黄调 主题（移动端优先）====== */
:root {
  --bg: #f5e9c8;
  --bg-deep: #ecd9a5;
  --paper: #fbf3dc;
  --ink: #3a2a13;
  --ink-soft: #6b4f28;
  --gold: #b8860b;
  --gold-deep: #8a5a08;
  --red-seal: #a8341f;
  --line: #c9a85a;
}

* { box-sizing: border-box; margin: 0; padding: 0; -webkit-tap-highlight-color: transparent; }

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

body {
  font-family: "STKaiti", "KaiTi", "Songti SC", "PingFang SC", "SimSun", serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.75;
  font-size: 15px;
  background-image:
    radial-gradient(circle at 20% 30%, rgba(184,134,11,0.08) 0, transparent 40%),
    radial-gradient(circle at 80% 70%, rgba(168,52,31,0.06) 0, transparent 40%);
}

/* ====== 顶部导航 ====== */
.site-header {
  background: linear-gradient(180deg, #e8cf86 0%, #dcbb63 100%);
  border-bottom: 2px double var(--gold-deep);
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: 0 2px 8px rgba(138,90,8,0.18);
}
.header-inner {
  padding: 10px 14px 0;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}
.seal {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px; height: 40px;
  background: var(--red-seal);
  color: #fbf3dc;
  font-family: "STKaiti", "KaiTi", serif;
  font-size: 11px;
  letter-spacing: 1px;
  border-radius: 4px;
  transform: rotate(-4deg);
  box-shadow: 0 2px 4px rgba(0,0,0,0.2);
  flex-shrink: 0;
}
.brand-text h1 {
  font-size: 17px;
  color: var(--ink);
  letter-spacing: 3px;
}
.brand-text p {
  font-size: 11px;
  color: var(--ink-soft);
  letter-spacing: 1px;
}
.top-nav {
  display: flex;
  gap: 2px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  padding: 4px 0 8px;
  scrollbar-width: none;
}
.top-nav::-webkit-scrollbar { display: none; }
.top-nav a {
  color: var(--ink);
  text-decoration: none;
  font-size: 13px;
  padding: 6px 12px;
  border-radius: 14px;
  letter-spacing: 1.5px;
  flex-shrink: 0;
  transition: all .2s;
}
.top-nav a:active {
  background: var(--gold);
  color: #fff8e1;
}

/* ====== Hero 区域 ====== */
.hero {
  position: relative;
  min-height: 320px;
  padding: 50px 20px;
  background:
    linear-gradient(180deg, rgba(245,233,200,0.4) 0%, var(--bg) 100%),
    repeating-linear-gradient(45deg, #e8cf86 0 2px, transparent 2px 20px),
    var(--bg-deep);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}
.hero-pattern {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, rgba(138,90,8,0.12) 1px, transparent 2px);
  background-size: 22px 22px;
  opacity: .5;
}
.hero-content {
  position: relative;
  text-align: center;
}
.hero-tag {
  font-size: 11px;
  color: var(--gold-deep);
  letter-spacing: 6px;
  margin-bottom: 14px;
}
.hero-title {
  font-size: 30px;
  color: var(--ink);
  letter-spacing: 6px;
  line-height: 1.5;
  font-weight: normal;
  text-shadow: 1px 1px 0 rgba(255,248,225,0.6);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}
.hero-line {
  display: inline-block;
}
.hero-line-1 {
  transform: translateX(-0.9em);
}
.hero-line-2 {
  transform: translateX(0.9em);
}
.hero-sub {
  margin-top: 12px;
  color: var(--ink-soft);
  font-size: 12px;
  letter-spacing: 1px;
  font-style: italic;
}
.hero-btn {
  display: inline-block;
  margin-top: 22px;
  padding: 10px 30px;
  background: var(--ink);
  color: var(--bg);
  text-decoration: none;
  letter-spacing: 4px;
  font-size: 14px;
  border: 1px solid var(--gold);
  position: relative;
}
.hero-btn::before, .hero-btn::after {
  content: "";
  position: absolute;
  width: 6px; height: 6px;
  border: 1px solid var(--gold);
}
.hero-btn::before { top: -3px; left: -3px; border-right: none; border-bottom: none; }
.hero-btn::after  { bottom: -3px; right: -3px; border-left: none; border-top: none; }
.hero-btn:active { background: var(--gold-deep); }

/* ====== 主要内容 ====== */
.container {
  padding: 28px 14px 36px;
}

.unit {
  background: var(--paper);
  border: 1px solid var(--line);
  margin-bottom: 18px;
  padding: 20px 18px;
  position: relative;
  box-shadow: 3px 3px 0 rgba(184,134,11,0.18);
}
.unit::before {
  content: "";
  position: absolute;
  inset: 5px;
  border: 1px solid rgba(184,134,11,0.35);
  pointer-events: none;
}

.unit-head {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-bottom: 12px;
  margin-bottom: 14px;
  border-bottom: 1px dashed var(--line);
}
.unit-num {
  width: 48px; height: 48px;
  flex-shrink: 0;
  background: var(--ink);
  color: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  border-radius: 50%;
  border: 2px solid var(--gold);
  box-shadow: 0 0 0 3px var(--paper), 0 0 0 4px var(--gold);
}
.unit-preface .unit-num { background: var(--red-seal); }
.unit-special .unit-num { background: var(--gold-deep); }

.unit-title-group h3 {
  font-size: 18px;
  letter-spacing: 4px;
  color: var(--ink);
  font-weight: normal;
}
.unit-en {
  font-size: 12px;
  color: var(--ink-soft);
  letter-spacing: 2px;
  margin-top: 3px;
}
.unit-titled .unit-title-group h3 {
  font-size: 17px;
  letter-spacing: 3px;
}
.unit-titled .unit-title-group .unit-en {
  margin-top: 5px;
  letter-spacing: 6px;
  color: var(--gold-deep);
  font-size: 11px;
}

.unit-body p {
  color: var(--ink);
  text-indent: 2em;
  font-size: 14.5px;
  margin-bottom: 14px;
  line-height: 1.85;
}

.play-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: transparent;
  border: 1px solid var(--gold-deep);
  color: var(--gold-deep);
  padding: 8px 22px;
  font-family: inherit;
  font-size: 13px;
  letter-spacing: 2px;
  cursor: pointer;
  border-radius: 2px;
}
.play-btn:active {
  background: var(--gold-deep);
  color: var(--paper);
}

/* ====== 页脚 ====== */
.site-footer {
  background: linear-gradient(180deg, var(--bg-deep) 0%, #c9a85a 100%);
  text-align: center;
  padding: 22px 16px;
  color: var(--ink);
  border-top: 2px double var(--gold-deep);
  letter-spacing: 1.5px;
  font-size: 12px;
}
.foot-sub {
  margin-top: 4px;
  color: var(--ink-soft);
  font-size: 11px;
  letter-spacing: 3px;
}

/* ====== 卡片弹窗（移动端：全屏）====== */
.card-modal {
  position: fixed;
  inset: 0;
  background: rgba(40, 26, 8, 0.86);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 100;
  display: flex;
  flex-direction: column;
  animation: fadeIn .25s ease;
  padding: env(safe-area-inset-top, 0) 0 env(safe-area-inset-bottom, 0);
}
.card-modal[hidden] { display: none; }

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}
@keyframes cardIn {
  from { opacity: 0; transform: translateY(16px) scale(.97); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

.modal-close {
  position: absolute;
  top: calc(env(safe-area-inset-top, 0) + 12px);
  right: 12px;
  z-index: 10;
  width: 38px; height: 38px;
  background: rgba(40,26,8,0.45);
  border: 1px solid var(--gold);
  color: var(--bg);
  font-size: 22px;
  line-height: 1;
  cursor: pointer;
  border-radius: 50%;
}
.modal-close:active {
  background: var(--gold);
  color: var(--ink);
}

.card-stage {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 14px 12px 6px;
  min-height: 0;
}

.card {
  width: 100%;
  max-width: 460px;
  max-height: 100%;
  background: var(--paper);
  border: 1px solid var(--line);
  box-shadow: 0 12px 40px rgba(0,0,0,0.4), 4px 4px 0 rgba(184,134,11,0.25);
  position: relative;
  animation: cardIn .3s ease;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.card::before {
  content: "";
  position: absolute;
  inset: 5px;
  border: 1px solid rgba(184,134,11,0.35);
  pointer-events: none;
  z-index: 1;
}

.card-image {
  height: 160px;
  flex-shrink: 0;
  background:
    repeating-linear-gradient(45deg, #d9b766 0 2px, transparent 2px 16px),
    linear-gradient(135deg, #c9a85a 0%, #b8860b 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}
.card-image::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at center, transparent 0%, rgba(58,42,19,0.3) 100%);
}
.card-image-label {
  position: relative;
  color: var(--paper);
  font-size: 20px;
  letter-spacing: 6px;
  z-index: 1;
  text-shadow: 0 2px 6px rgba(0,0,0,0.4);
}
.card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.card-image.has-image::after,
.card-image.has-image .card-image-label { display: none; }

.card-audio {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  background: linear-gradient(180deg, #f3e6bf 0%, var(--paper) 100%);
  border-bottom: 1px dashed var(--line);
  flex-shrink: 0;
}
.audio-btn {
  width: 44px; height: 44px;
  border-radius: 50%;
  background: var(--ink);
  color: var(--bg);
  border: 2px solid var(--gold);
  cursor: pointer;
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.audio-btn:active { background: var(--gold-deep); }
.audio-btn.playing { background: var(--red-seal); }
.audio-btn .icon-play::before { content: "▶"; }
.audio-btn.playing .icon-play::before { content: "■"; font-size: 14px; letter-spacing: 0; }

.audio-meta { flex: 1; min-width: 0; }
.progress {
  height: 4px;
  background: rgba(138,90,8,0.18);
  border-radius: 2px;
  cursor: pointer;
  overflow: hidden;
  touch-action: none;
}
.progress-bar {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--gold) 0%, var(--gold-deep) 100%);
  transition: width .15s linear;
}
.time {
  font-size: 10px;
  color: var(--ink-soft);
  margin-top: 5px;
  letter-spacing: 1px;
  font-family: "Courier New", monospace;
}

.card-text {
  padding: 16px 18px 18px;
  position: relative;
  z-index: 2;
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
}
.card-unit-tag {
  align-self: flex-start;
  background: var(--ink);
  color: var(--bg);
  font-size: 11px;
  padding: 3px 10px;
  letter-spacing: 2px;
  margin-bottom: 10px;
}
.card-title {
  font-size: 19px;
  letter-spacing: 3px;
  color: var(--ink);
  font-weight: normal;
  margin-bottom: 10px;
  padding-bottom: 8px;
  border-bottom: 1px dashed var(--line);
  flex-shrink: 0;
}
.card-desc {
  color: var(--ink);
  font-size: 14px;
  line-height: 1.85;
  flex: 1;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding-right: 4px;
}
.card-desc p {
  text-indent: 2em;
  margin-bottom: 9px;
}
.card-desc p:last-child { margin-bottom: 0; }
.card-figure {
  margin: 10px 0 12px;
  text-align: center;
}
.card-figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  box-shadow: 2px 2px 0 rgba(184,134,11,0.18);
}
.card-figure figcaption {
  margin-top: 6px;
  font-size: 12px;
  color: var(--ink-soft);
  letter-spacing: 1px;
}
.card-desc .inline-img {
  display: inline-block;
  vertical-align: middle;
  max-height: 1.6em;
  margin: 0 2px;
}
.card-desc::-webkit-scrollbar { width: 4px; }
.card-desc::-webkit-scrollbar-thumb { background: var(--line); border-radius: 2px; }

.card-foot {
  margin-top: 10px;
  text-align: right;
  flex-shrink: 0;
}
.card-index {
  font-size: 11px;
  color: var(--ink-soft);
  letter-spacing: 2px;
  font-family: "Courier New", monospace;
}

/* ====== 继续播放浮层（扫码单播模式）====== */
.continue-prompt {
  position: absolute;
  inset: 0;
  background: rgba(40, 26, 8, 0.78);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  pointer-events: none;
  transition: opacity .25s ease;
  z-index: 60;
}
.continue-prompt.show {
  opacity: 1;
  pointer-events: auto;
}
.continue-inner {
  background: var(--paper);
  border: 1px solid var(--line);
  box-shadow: 0 12px 40px rgba(0,0,0,0.4), 4px 4px 0 rgba(184,134,11,0.25);
  padding: 26px 28px 22px;
  max-width: 320px;
  width: 100%;
  text-align: center;
  position: relative;
}
.continue-inner::before {
  content: "";
  position: absolute;
  inset: 5px;
  border: 1px solid rgba(184,134,11,0.35);
  pointer-events: none;
}
.continue-inner p {
  margin: 0;
  color: var(--ink);
  font-size: 17px;
  letter-spacing: 2px;
}
.continue-inner .continue-sub {
  margin-top: 8px;
  color: var(--ink-soft);
  font-size: 13px;
  letter-spacing: 1px;
}
.continue-btns {
  margin-top: 22px;
  display: flex;
  gap: 12px;
  justify-content: center;
}
.cp-btn {
  font: inherit;
  font-size: 14px;
  padding: 9px 22px;
  border-radius: 2px;
  cursor: pointer;
  letter-spacing: 2px;
  position: relative;
}
.cp-btn.cp-no {
  background: transparent;
  border: 1px solid var(--gold-deep);
  color: var(--gold-deep);
}
.cp-btn.cp-no:active { background: rgba(184,134,11,0.1); }
.cp-btn.cp-yes {
  background: var(--ink);
  color: var(--bg);
  border: 1px solid var(--gold);
}
.cp-btn.cp-yes:active { background: var(--gold-deep); }

/* ====== 移动端：箭头底部一字排开 ====== */
.modal-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  padding: 10px 12px 14px;
  flex-shrink: 0;
}
.nav-arrow {
  width: 50px; height: 50px;
  background: rgba(251,243,220,0.12);
  border: 1px solid var(--gold);
  color: var(--bg);
  font-size: 26px;
  line-height: 1;
  cursor: pointer;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.nav-arrow:active {
  background: var(--gold);
  color: var(--ink);
}
.nav-arrow:disabled {
  opacity: .3;
  cursor: not-allowed;
}

/* ====== 平板（≥600px）====== */
@media (min-width: 600px) {
  body { font-size: 16px; }
  .header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    padding: 12px 22px;
    gap: 12px;
  }
  .brand { margin-bottom: 0; }
  .seal { width: 48px; height: 48px; font-size: 12px; }
  .brand-text h1 { font-size: 20px; letter-spacing: 4px; }
  .top-nav { padding: 0; gap: 4px; }
  .top-nav a { font-size: 14px; padding: 6px 14px; letter-spacing: 2px; }

  .hero { min-height: 380px; }
  .hero-title { font-size: 42px; letter-spacing: 8px; }
  .hero-tag { letter-spacing: 8px; }

  .container { padding: 40px 24px; max-width: 720px; margin: 0 auto; }
  .unit { padding: 28px 26px; margin-bottom: 24px; }
  .unit-num { width: 56px; height: 56px; font-size: 24px; }
  .unit-title-group h3 { font-size: 22px; letter-spacing: 5px; }
  .unit-titled .unit-title-group h3 { font-size: 20px; letter-spacing: 4px; }
  .unit-body p { font-size: 15.5px; }

  .card-image { height: 200px; }
  .card-title { font-size: 22px; letter-spacing: 4px; }
}

/* ====== 桌面（≥960px）：箭头改回卡片两侧 ====== */
@media (min-width: 960px) {
  body { font-size: 17px; }
  .header-inner { padding: 14px 28px; max-width: 1100px; margin: 0 auto; }
  .brand-text h1 { font-size: 22px; }

  .hero { min-height: 460px; }
  .hero-title { font-size: 52px; letter-spacing: 10px; }

  .container { max-width: 1000px; padding: 60px 24px; }
  .unit {
    padding: 36px 40px;
    margin-bottom: 32px;
    transition: transform .3s, box-shadow .3s;
  }
  .unit:hover {
    transform: translate(-2px, -2px);
    box-shadow: 8px 8px 0 rgba(184,134,11,0.2);
  }
  .unit-num { width: 64px; height: 64px; font-size: 28px; }
  .unit-title-group h3 { font-size: 26px; letter-spacing: 6px; }
  .unit-titled .unit-title-group h3 { font-size: 23px; letter-spacing: 5px; }
  .unit-body p { font-size: 16px; }

  .play-btn { font-size: 14px; padding: 8px 24px; }

  /* 弹窗在桌面端使用居中布局 + 两侧箭头 */
  .card-modal {
    flex-direction: row;
    align-items: center;
    justify-content: center;
    padding: 30px 20px;
  }
  .modal-close { top: 22px; right: 28px; width: 44px; height: 44px; font-size: 26px; }
  .modal-close:hover {
    background: var(--gold); color: var(--ink); transform: rotate(90deg);
    transition: all .25s;
  }

  .card-stage {
    flex: 1;
    max-width: 480px;
    padding: 0;
    align-items: center;
  }
  .card { max-height: calc(100vh - 80px); }
  .card-image { height: 220px; }

  .modal-controls {
    display: contents; /* 让按钮直接成为 .card-modal 的 flex 子项 */
  }
  .nav-arrow {
    width: 56px; height: 56px;
    font-size: 32px;
    margin: 0 18px;
    transition: all .25s;
  }
  .nav-arrow:hover {
    background: var(--gold); color: var(--ink); transform: scale(1.08);
  }
  .nav-prev { order: 0; }
  .card-stage { order: 1; }
  .nav-next { order: 2; }
}