:root {
  --font-scale: 1.08;
  --bg: #f5f8ff;
  --text: #1f2328;
  --muted: #57606a;
  --header-bg: linear-gradient(135deg, #ffffff 0%, #f3f7ff 100%);
  --header-border: #dbe5f0;
  --panel-bg: #ffffff;
  --panel-border: #e5e7eb;
  --shadow: 0 1px 2px rgba(0,0,0,.03);
  --header-shadow: 0 10px 30px rgba(15, 23, 42, .05);
  --nav-bg: #ffffff;
  --nav-border: #d0d7de;
  --link: #0969da;
  --link-hover: #0a58ca;
  --pill-bg: #eef2ff;
  --pill-text: #3754b5;
  --quote-bg: #f8fbff;
  --quote-border: #d9e6ff;
  --hero-text: #334155;
  --tool-bg: rgba(255,255,255,.96);
  --tool-border: #dbe5f0;
  --primary-bg: #0969da;
  --primary-text: #ffffff;
  --primary-border: #0969da;
  --toast-bg: rgba(17,24,39,.92);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1220;
    --text: #e6edf3;
    --muted: #9aa4b2;
    --header-bg: linear-gradient(135deg, #0f172a 0%, #0b1326 100%);
    --header-border: #223044;
    --panel-bg: #0f172a;
    --panel-border: #223044;
    --shadow: 0 1px 2px rgba(0,0,0,.35);
    --header-shadow: 0 10px 30px rgba(0,0,0,.3);
    --nav-bg: #0f172a;
    --nav-border: #223044;
    --link: #8ab4ff;
    --link-hover: #a8c5ff;
    --pill-bg: #111b2e;
    --pill-text: #a8c5ff;
    --quote-bg: #0b1b34;
    --quote-border: #223044;
    --hero-text: #cbd5e1;
    --tool-bg: rgba(15,23,42,.92);
    --tool-border: #223044;
    --toast-bg: rgba(0,0,0,.75);
  }
}

html[data-theme="light"] {
  --bg: #f5f8ff;
  --text: #1f2328;
  --muted: #57606a;
  --header-bg: linear-gradient(135deg, #ffffff 0%, #f3f7ff 100%);
  --header-border: #dbe5f0;
  --panel-bg: #ffffff;
  --panel-border: #e5e7eb;
  --shadow: 0 1px 2px rgba(0,0,0,.03);
  --header-shadow: 0 10px 30px rgba(15, 23, 42, .05);
  --nav-bg: #ffffff;
  --nav-border: #d0d7de;
  --link: #0969da;
  --link-hover: #0a58ca;
  --pill-bg: #eef2ff;
  --pill-text: #3754b5;
  --quote-bg: #f8fbff;
  --quote-border: #d9e6ff;
  --hero-text: #334155;
  --tool-bg: rgba(255,255,255,.96);
  --tool-border: #dbe5f0;
  --toast-bg: rgba(17,24,39,.92);
}

html[data-theme="dark"] {
  --bg: #0b1220;
  --text: #e6edf3;
  --muted: #9aa4b2;
  --header-bg: linear-gradient(135deg, #0f172a 0%, #0b1326 100%);
  --header-border: #223044;
  --panel-bg: #0f172a;
  --panel-border: #223044;
  --shadow: 0 1px 2px rgba(0,0,0,.35);
  --header-shadow: 0 10px 30px rgba(0,0,0,.3);
  --nav-bg: #0f172a;
  --nav-border: #223044;
  --link: #8ab4ff;
  --link-hover: #a8c5ff;
  --pill-bg: #111b2e;
  --pill-text: #a8c5ff;
  --quote-bg: #0b1b34;
  --quote-border: #223044;
  --hero-text: #cbd5e1;
  --tool-bg: rgba(15,23,42,.92);
  --tool-border: #223044;
  --toast-bg: rgba(0,0,0,.75);
}

html[data-theme="black"] {
  --bg: #05070f;
  --text: #e6edf3;
  --muted: #9aa4b2;
  --header-bg: linear-gradient(135deg, #0a0f1f 0%, #070b18 100%);
  --header-border: #1a2740;
  --panel-bg: #0a0f1f;
  --panel-border: #1a2740;
  --shadow: 0 1px 2px rgba(0,0,0,.55);
  --header-shadow: 0 10px 30px rgba(0,0,0,.45);
  --nav-bg: #0a0f1f;
  --nav-border: #1a2740;
  --link: #8ab4ff;
  --link-hover: #b7d1ff;
  --pill-bg: #0f162c;
  --pill-text: #b7d1ff;
  --quote-bg: #0b1b34;
  --quote-border: #1a2740;
  --hero-text: #cbd5e1;
  --tool-bg: rgba(10,15,31,.92);
  --tool-border: #1a2740;
  --toast-bg: rgba(0,0,0,.8);
}

html[data-theme="forest"] {
  --bg: #06130f;
  --text: #e6edf3;
  --muted: #9aa4b2;
  --header-bg: linear-gradient(135deg, #0b1f17 0%, #081813 100%);
  --header-border: #133829;
  --panel-bg: #0b1f17;
  --panel-border: #133829;
  --shadow: 0 1px 2px rgba(0,0,0,.55);
  --header-shadow: 0 10px 30px rgba(0,0,0,.45);
  --nav-bg: #0b1f17;
  --nav-border: #133829;
  --link: #63d5a5;
  --link-hover: #7ee7bd;
  --pill-bg: #0d2a20;
  --pill-text: #8ff0c9;
  --quote-bg: #0d2a20;
  --quote-border: #133829;
  --hero-text: #cdeee2;
  --tool-bg: rgba(11,31,23,.92);
  --tool-border: #133829;
  --toast-bg: rgba(0,0,0,.8);
}

html[data-theme="slate"] {
  --bg: #0a0f1a;
  --text: #e6edf3;
  --muted: #9aa4b2;
  --header-bg: linear-gradient(135deg, #0f1728 0%, #0b1326 100%);
  --header-border: #26324a;
  --panel-bg: #0f1728;
  --panel-border: #26324a;
  --shadow: 0 1px 2px rgba(0,0,0,.5);
  --header-shadow: 0 10px 30px rgba(0,0,0,.45);
  --nav-bg: #0f1728;
  --nav-border: #26324a;
  --link: #7aa2f7;
  --link-hover: #9bb8ff;
  --pill-bg: #111b2e;
  --pill-text: #a8c5ff;
  --quote-bg: #111b2e;
  --quote-border: #26324a;
  --hero-text: #d6e1ff;
  --tool-bg: rgba(15,23,40,.92);
  --tool-border: #26324a;
  --toast-bg: rgba(0,0,0,.8);
}

html[data-theme="purple"] {
  --bg: #100a1a;
  --text: #efe9ff;
  --muted: #b7b0c8;
  --header-bg: linear-gradient(135deg, #1a0f2a 0%, #140c22 100%);
  --header-border: #34204d;
  --panel-bg: #1a0f2a;
  --panel-border: #34204d;
  --shadow: 0 1px 2px rgba(0,0,0,.55);
  --header-shadow: 0 10px 30px rgba(0,0,0,.45);
  --nav-bg: #1a0f2a;
  --nav-border: #34204d;
  --link: #c4b5fd;
  --link-hover: #d8b4fe;
  --pill-bg: #22113a;
  --pill-text: #e9d5ff;
  --quote-bg: #22113a;
  --quote-border: #34204d;
  --hero-text: #e9d5ff;
  --tool-bg: rgba(26,15,42,.92);
  --tool-border: #34204d;
  --toast-bg: rgba(0,0,0,.8);
}

html[data-theme="sepia"] {
  --bg: #f7f2e7;
  --text: #2b2118;
  --muted: #6b5b4d;
  --header-bg: linear-gradient(135deg, #fffaf0 0%, #f3ead9 100%);
  --header-border: #eadcc8;
  --panel-bg: #fffaf0;
  --panel-border: #eadcc8;
  --shadow: 0 1px 2px rgba(0,0,0,.05);
  --header-shadow: 0 10px 30px rgba(0,0,0,.08);
  --nav-bg: #fffaf0;
  --nav-border: #e0cfb8;
  --link: #8a4b00;
  --link-hover: #a85e00;
  --pill-bg: #f3e8d8;
  --pill-text: #7a3f00;
  --quote-bg: #f3ead9;
  --quote-border: #e0cfb8;
  --hero-text: #4b3b2f;
  --tool-bg: rgba(255,250,240,.92);
  --tool-border: #e0cfb8;
  --toast-bg: rgba(43,33,24,.92);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
  font-size: calc(16px * var(--font-scale));
  line-height: 1.75;
  margin: 0;
  color: var(--text);
  background: var(--bg);
  min-height: 100vh;
}

/* 主内容区：桌面端给右侧设置面板留 240px，避免遮挡；窄屏还原。 */
main {
  padding-right: 240px;
}
@media (max-width: 1100px) {
  main { padding-right: 20px; }
}

.small {
  color: var(--muted);
  font-size: 14px;
}

footer {
  margin-top: 24px;
  color: var(--muted);
  font-size: 14px;
}

.font-zoom {
  position: fixed;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 999;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 10px;
  border: 1px solid var(--tool-border);
  border-radius: 14px;
  background: var(--tool-bg);
  box-shadow: 0 10px 24px rgba(15, 23, 42, .12);
  transition: padding 0.2s ease, border-radius 0.2s ease, background 0.2s ease;
}

/* 折叠态：只保留一个圆形按钮，body 隐藏 */
.font-zoom.is-collapsed {
  padding: 6px;
  border-radius: 50%;
  width: 44px;
  height: 44px;
  gap: 0;
}
.font-zoom.is-collapsed .font-zoom-body { display: none; }

/* 展开态的圆形触发按钮 */
.font-zoom-toggle {
  display: none;
  width: 32px;
  height: 32px;
  padding: 0;
  border: 1px solid var(--nav-border);
  background: var(--nav-bg);
  color: var(--text);
  border-radius: 50%;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  transition: border-color 0.15s ease, color 0.15s ease, transform 0.15s ease;
}
.font-zoom-toggle:hover {
  border-color: var(--link);
  color: var(--link-hover);
  transform: scale(1.05);
}
/* 折叠态显示触发按钮，展开态把触发按钮换成"收起"叉 */
.font-zoom.is-collapsed .font-zoom-toggle { display: inline-flex; }
.font-zoom:not(.is-collapsed) .font-zoom-toggle {
  display: inline-flex;
  margin-bottom: 4px;
  background: transparent;
  border: none;
  color: var(--muted);
}
.font-zoom:not(.is-collapsed) .font-zoom-toggle::before { content: "×"; font-size: 22px; line-height: 1; }
.font-zoom:not(.is-collapsed) .font-zoom-toggle svg { display: none; }

.font-zoom-body {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 8px;
  width: 100%;
}

.font-zoom-label {
  font-size: 12px;
  color: var(--muted);
  text-align: center;
}

.font-zoom button,
.font-zoom select {
  border: 1px solid var(--nav-border);
  background: var(--nav-bg);
  color: var(--text);
  border-radius: 10px;
  padding: 8px 10px;
  cursor: pointer;
  font-size: 13px;
  font: inherit;
}

.font-zoom button:hover,
.font-zoom select:hover {
  border-color: var(--link);
}

.font-zoom button:hover {
  color: var(--link-hover);
}

@media (max-width: 960px) {
  .font-zoom {
    right: 10px;
    bottom: 12px;
    top: auto;
    transform: none;
    flex-direction: row;
    align-items: center;
  }

  .font-zoom.is-collapsed {
    border-radius: 50%;
    width: 44px;
    height: 44px;
  }
  .font-zoom.is-collapsed .font-zoom-body { display: none; }

  .font-zoom-body {
    flex-direction: row;
    align-items: center;
  }

  .font-zoom-label {
    display: none;
  }
}