/* =============================================================
   古韵抽卡 v3.0 · 文艺清新 · 明信片
   配色：暖白宣纸底 + 青瓷绿点缀 + 墨黑文字 + 朱砂印章
   ============================================================= */

:root {
  /* 亮色（文艺清新） */
  --bg:          #faf8f4;
  --bg-grad:     #f3efe6;
  --card:        #ffffff;
  --ink:         #2d2a26;
  --ink-soft:    #5c574e;
  --sub:         #8a8578;
  --line:        rgba(45, 42, 38, 0.10);
  --line-strong: rgba(45, 42, 38, 0.18);
  --accent:      #6b8e7a;          /* 青瓷 */
  --accent-deep: #55735f;
  --accent-soft: rgba(107, 142, 122, 0.12);
  --vermilion:   #a8321e;          /* 朱砂 */
  --warn-bg:     #fdf6ec;
  --warn-line:  #e8d5b7;

  --shadow-sm: 0 1px 2px rgba(45, 42, 38, 0.05);
  --shadow-md: 0 2px 8px rgba(45, 42, 38, 0.06), 0 8px 24px rgba(45, 42, 38, 0.06);
  --shadow-lg: 0 4px 12px rgba(45, 42, 38, 0.06), 0 20px 48px rgba(45, 42, 38, 0.10);

  --font-serif: 'Songti SC', 'STSong', 'SimSun', 'Noto Serif CJK SC', 'Source Han Serif SC', serif;
  --font-sans: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Noto Sans CJK SC', sans-serif;

  --r-card: 20px;
  --r-btn: 999px;
}

/* 暗色 */
.pc-dark {
  --bg:          #171614;
  --bg-grad:     #201e1b;
  --card:        #232120;
  --ink:         #eae6dc;
  --ink-soft:    #c9c4b8;
  --sub:         #948e82;
  --line:        rgba(234, 230, 220, 0.12);
  --line-strong: rgba(234, 230, 220, 0.22);
  --accent:      #8fb39c;
  --accent-deep: #a8c9b4;
  --accent-soft: rgba(143, 179, 156, 0.14);
  --vermilion:   #c8553d;
  --warn-bg:     #2a241c;
  --warn-line:  #4a3f2e;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.30);
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.35), 0 8px 24px rgba(0, 0, 0, 0.30);
  --shadow-lg: 0 4px 12px rgba(0, 0, 0, 0.40), 0 20px 48px rgba(0, 0, 0, 0.45);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
}

body {
  min-height: 100vh;
  background:
    radial-gradient(1200px 600px at 50% -10%, var(--bg-grad) 0%, transparent 60%),
    var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color .3s ease, color .3s ease;
}

/* ── 页面容器 ─────────────────────────────────────────── */
.pc-page {
  max-width: 520px;
  margin: 0 auto;
  padding: 40px 20px 56px;
}

/* ── 头部 ─────────────────────────────────────────────── */
.pc-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 24px;
}

.pc-brand {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 27px;
  font-weight: 600;
  letter-spacing: .16em;
  color: var(--ink);
}

.pc-tagline {
  margin: 7px 0 0;
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--sub);
}

.pc-theme-btn {
  flex: none;
  padding: 7px 15px;
  font-family: var(--font-sans);
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--sub);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r-btn);
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: color .2s, border-color .2s, transform .2s;
}
.pc-theme-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
  transform: translateY(-1px);
}

/* ── 降级横幅 ─────────────────────────────────────────── */
.pc-degraded {
  display: none;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
  padding: 12px 16px;
  font-size: 13px;
  color: var(--ink-soft);
  background: var(--warn-bg);
  border: 1px solid var(--warn-line);
  border-radius: 12px;
  animation: pc-fade-in .3s ease;
}
.pc-degraded--show { display: flex; }
.pc-degraded-msg { flex: 1; line-height: 1.6; }
.pc-degraded-btn {
  flex: none;
  padding: 6px 13px;
  font-size: 12.5px;
  font-family: var(--font-sans);
  color: var(--accent-deep);
  background: transparent;
  border: 1px solid currentColor;
  border-radius: var(--r-btn);
  cursor: pointer;
  transition: background-color .2s, color .2s;
}
.pc-degraded-btn:hover { background: var(--accent-soft); }

/* ── 明信片 ───────────────────────────────────────────── */
.pc-stage { min-height: 420px; }

.postcard {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .55s cubic-bezier(.22,.61,.36,1), transform .55s cubic-bezier(.22,.61,.36,1);
}
.postcard.is-in { opacity: 1; transform: none; }

/* 配图区 */
.postcard-media {
  position: relative;
  aspect-ratio: 3 / 2;
  background: linear-gradient(135deg, #e8e4d9 0%, #d5cfc0 50%, #c2bba9 100%);
  overflow: hidden;
}
.pc-dark .postcard-media {
  background: linear-gradient(135deg, #2e2b27 0%, #3a3630 50%, #464139 100%);
}
.postcard-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  animation: pc-img-in .8s ease both;
}
.postcard-media--empty { width: 100%; height: 100%; }

@keyframes pc-img-in {
  from { opacity: 0; transform: scale(1.06); }
  to   { opacity: 1; transform: none; }
}

/* 图文过渡：图片下缘柔化到卡片底色 */
.postcard-media::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 56px;
  background: linear-gradient(to bottom, transparent, var(--card));
  pointer-events: none;
}

/* 文字区 */
.postcard-body {
  padding: 26px 28px 20px;
  text-align: center;
}

.postcard-title {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 25px;
  font-weight: 600;
  letter-spacing: .08em;
  color: var(--ink);
  line-height: 1.45;
}

.postcard-meta {
  margin: 9px 0 0;
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--sub);
}

.postcard-rule {
  width: 46px;
  height: 1px;
  margin: 18px auto;
  background: var(--line-strong);
}

.postcard-verse {
  font-family: var(--font-serif);
  font-size: 16.5px;
  line-height: 2.05;
  letter-spacing: .04em;
  color: var(--ink-soft);
}
.postcard-verse p { margin: 0 0 2px; }
.postcard-verse p:last-child { margin-bottom: 0; }

/* 落款 + 印章 */
.postcard-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}
.postcard-credit {
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--sub);
}
.postcard-seal {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  font-family: var(--font-serif);
  font-size: 15px;
  font-weight: 700;
  color: #fff7e6;
  background: var(--vermilion);
  border-radius: 5px;
  transform: rotate(-4deg);
  box-shadow: var(--shadow-sm);
}

/* ── 骨架屏 ───────────────────────────────────────────── */
.pc-skeleton {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}
.pc-skeleton-media {
  position: relative;
  aspect-ratio: 3 / 2;
  background: var(--bg-grad);
  overflow: hidden;
}
.pc-skeleton-lines {
  padding: 26px 28px 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 11px;
}
.pc-skeleton-line {
  height: 13px;
  border-radius: 6px;
  background: var(--bg-grad);
}
.pc-skeleton-text {
  padding: 0 0 22px;
  text-align: center;
  font-size: 12.5px;
  letter-spacing: .14em;
  color: var(--sub);
}

.pc-shimmer {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    100deg,
    transparent 20%,
    rgba(255, 255, 255, 0.55) 50%,
    transparent 80%
  );
  animation: pc-shimmer 1.5s infinite;
}
.pc-dark .pc-shimmer {
  background: linear-gradient(
    100deg,
    transparent 20%,
    rgba(255, 255, 255, 0.06) 50%,
    transparent 80%
  );
}
@keyframes pc-shimmer {
  from { transform: translateX(-100%); }
  to   { transform: translateX(100%); }
}

/* ── 操作区 ───────────────────────────────────────────── */
.pc-actions {
  display: flex;
  gap: 10px;
  margin-top: 22px;
}

.pc-btn {
  flex: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 13px 14px;
  font-family: var(--font-sans);
  font-size: 14px;
  letter-spacing: .06em;
  color: var(--ink);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r-btn);
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: transform .18s ease, border-color .18s ease, color .18s ease, box-shadow .18s ease;
}
.pc-btn:hover:not(:disabled) {
  transform: translateY(-2px);
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: var(--shadow-md);
}
.pc-btn:active:not(:disabled) { transform: translateY(0); }
.pc-btn:disabled { opacity: .45; cursor: not-allowed; }

.pc-btn--primary {
  flex: 1.25;
  color: #fff;
  background: var(--accent);
  border-color: var(--accent);
}
.pc-btn--primary:hover:not(:disabled) {
  color: #fff;
  background: var(--accent-deep);
  border-color: var(--accent-deep);
}

/* 按钮内 spinner（加载时显示） */
.pc-btn-spinner {
  display: none;
  width: 14px;
  height: 14px;
  border: 2px solid currentColor;
  border-top-color: transparent;
  border-radius: 50%;
  animation: pc-spin .7s linear infinite;
}
.pc-btn.is-busy .pc-btn-spinner { display: inline-block; }
@keyframes pc-spin { to { transform: rotate(360deg); } }

/* ── 提示行 ───────────────────────────────────────────── */
.pc-hint {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin: 14px 2px 0;
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--sub);
}
.pc-source-note { flex: 1; }
.pc-kbd-hint { flex: none; }
.pc-kbd-hint kbd {
  padding: 1px 6px;
  font-family: var(--font-sans);
  font-size: 11px;
  color: var(--ink-soft);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 4px;
}

/* ── 页脚 ─────────────────────────────────────────────── */
.pc-footer {
  margin-top: 34px;
  text-align: center;
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--sub);
}
.pc-footer a { color: var(--accent); text-decoration: none; }
.pc-footer a:hover { text-decoration: underline; }
.pc-dot { margin: 0 8px; opacity: .5; }

/* ── Toast ────────────────────────────────────────────── */
.pc-toast {
  position: fixed;
  left: 50%;
  bottom: 40px;
  z-index: 100;
  max-width: 84vw;
  padding: 11px 20px;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--card);
  background: rgba(45, 42, 38, .93);
  border-radius: var(--r-btn);
  box-shadow: var(--shadow-md);
  transform: translate(-50%, 16px);
  opacity: 0;
  pointer-events: none;
  transition: opacity .28s ease, transform .28s ease;
}
.pc-dark .pc-toast { background: rgba(234, 230, 220, .95); color: #232120; }
.pc-toast--show { opacity: 1; transform: translate(-50%, 0); }

/* ── 空态 / 错误 ──────────────────────────────────────── */
.pc-empty {
  margin: 0;
  padding: 60px 20px;
  text-align: center;
  font-size: 14px;
  letter-spacing: .1em;
  color: var(--sub);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r-card);
}

@keyframes pc-fade-in {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: none; }
}

/* ── 移动端 ───────────────────────────────────────────── */
@media (max-width: 480px) {
  .pc-page { padding: 28px 16px 44px; }
  .pc-brand { font-size: 24px; }
  .postcard-body { padding: 22px 20px 18px; }
  .postcard-title { font-size: 22px; }
  .postcard-verse { font-size: 15.5px; line-height: 1.95; }
  .pc-actions { flex-wrap: wrap; }
  .pc-btn { flex: 1 1 100%; }
  .pc-btn--primary { flex: 1 1 100%; }
  .pc-hint { flex-direction: column; align-items: flex-start; gap: 6px; }
}

/* 尊重系统「减少动效」设置 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}