:root {
  --bg: #1a1a2e;
  --header-bg: #16213e;
  --card-bg: #16213e;
  --card-bg-hover: #1c2b4d;
  --secondary-bg: #0f3460;
  --text: #eee;
  --text-dim: #aaa;
  --text-dimmer: #666;
  --accent: #e94560;
  --accent-hover: #c73652;
  --success: #27ae60;
  --warning: #f39c12;
  --input-bg: #0d1b2a;
  --border: #0f3460;
  --border-light: #1e3a5f;
  --info: #29b6f6;
  --btn-disabled: #444;
}

[data-theme="light"] {
  --bg: #f2f3f5;
  --header-bg: #ffffff;
  --card-bg: #ffffff;
  --card-bg-hover: #f5f5f7;
  --secondary-bg: #ebebeb;
  --text: #1a1a2e;
  --text-dim: #888;
  --text-dimmer: #aaa;
  --accent: #e94560;
  --accent-hover: #c73652;
  --success: #1e8449;
  --warning: #c87f0a;
  --input-bg: #f7f7f7;
  --border: #e0e0e0;
  --border-light: #d8d8d8;
  --info: #1976d2;
  --btn-disabled: #ccc;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
*:not(.skip-transition) { transition: background-color .2s, color .2s, border-color .2s; }

/* ── 中英文切换：默认显示中文，data-lang=en时反过来 ── */
html[data-lang="zh"] .en { display: none; }
html[data-lang="en"] .zh { display: none; }
.lang-toggle {
  margin-left: auto;
  background: var(--secondary-bg);
  border: 1px solid var(--border-light);
  border-radius: 20px;
  padding: 0 12px;
  height: 36px;
  font-size: 13px;
  cursor: pointer;
  color: var(--text);
  flex-shrink: 0;
}
.lang-toggle:hover { opacity: .85; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, sans-serif;
  min-height: 100vh;
}

/* ── 顶部Header ── */
.site-header {
  background: var(--header-bg);
  padding: 14px 24px;
  display: flex;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid var(--border);
}
.site-title {
  color: var(--accent);
  font-size: 20px;
  font-weight: 700;
  text-decoration: none;
}
.site-tagline {
  font-size: 13px;
  color: var(--text-dim);
  margin-left: 8px;
}
.theme-toggle {
  background: var(--secondary-bg);
  border: 1px solid var(--border-light);
  border-radius: 20px;
  width: 36px;
  height: 36px;
  font-size: 15px;
  cursor: pointer;
  color: var(--text);
  flex-shrink: 0;
}
.theme-toggle:hover { opacity: .85; }

/* ── 工具导航条 ── */
.tool-nav {
  display: flex;
  gap: 4px;
  background: var(--header-bg);
  border-bottom: 1px solid var(--border);
  padding: 0 20px;
  overflow-x: auto;
}
.tool-nav a {
  display: inline-block;
  padding: 12px 16px;
  font-size: 14px;
  color: var(--text-dim);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
}
.tool-nav a:hover { color: var(--text); }
.tool-nav a.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
  font-weight: 600;
}

/* ── 整体内容区 ── */
.site-main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px 20px 50px;
}
.site-footer {
  text-align: center;
  color: var(--text-dimmer);
  font-size: 12px;
  padding: 24px 20px;
  border-top: 1px solid var(--border);
  margin-top: 20px;
}

a.back { color: var(--text-dim); text-decoration: none; font-size: 14px; }

/* ── 首页 Hero ── */
.hero { text-align: center; padding: 36px 0 30px; }
.hero h1 { font-size: 28px; margin-bottom: 10px; }
.hero p { color: var(--text-dim); font-size: 15px; max-width: 480px; margin: 0 auto; }

/* ── 首页工具卡片网格 ── */
.tools { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; margin-top: 10px; }
.tool-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 22px;
  text-decoration: none;
  color: var(--text);
  display: block;
}
.tool-card:hover { background: var(--card-bg-hover); border-color: var(--border-light); }
.tool-card .icon { font-size: 28px; margin-bottom: 10px; display: block; }
.tool-card h3 { margin: 0 0 6px; color: var(--accent); font-size: 16px; }
.tool-card p { margin: 0; color: var(--text-dim); font-size: 13px; line-height: 1.5; }

/* ── 工具页：侧栏 + 主区 两栏布局 ── */
.tool-layout { display: flex; gap: 16px; flex-wrap: wrap; margin-top: 16px; }
.tool-sidebar {
  width: 280px; flex-shrink: 0;
  background: var(--card-bg); border: 1px solid var(--border); border-radius: 12px; padding: 18px;
  display: flex; flex-direction: column; gap: 16px;
  height: fit-content;
}
.tool-content {
  flex: 1; min-width: 280px;
  background: var(--card-bg); border: 1px solid var(--border); border-radius: 12px; padding: 22px;
  display: flex; flex-direction: column; gap: 16px;
}
.tool-content h2 { font-size: 17px; margin: 0; }
.tool-content .sub { font-size: 13px; color: var(--text-dim); margin: -8px 0 4px; }

.step-title { font-size: 12px; font-weight: 700; color: var(--accent); text-transform: uppercase; letter-spacing: .5px; margin-bottom: 8px; }
.upload-zone {
  border: 2px dashed var(--border-light); border-radius: 10px; padding: 22px 16px;
  text-align: center; cursor: pointer; color: var(--text-dim); font-size: 13px;
}
.upload-zone:hover { border-color: var(--accent); }
.status { font-size: 13px; margin-top: 8px; min-height: 18px; }
.status.ok { color: var(--success); }
.status.err { color: var(--error, #e74c3c); }

textarea {
  width: 100%; background: var(--input-bg); border: 1px solid var(--border); border-radius: 8px;
  color: var(--text); padding: 10px; font-size: 14px; box-sizing: border-box; resize: vertical;
  min-height: 110px;
}
.char-count { font-size: 12px; color: var(--text-dimmer); text-align: right; }

.btn { width: 100%; display: inline-block; border: none; border-radius: 8px; padding: 11px 16px; font-size: 14px; font-weight: 600; cursor: pointer; transition: opacity .2s; }
.btn:hover { opacity: .85; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:disabled { background: var(--btn-disabled); cursor: not-allowed; opacity: 1; }
.btn-dl { background: var(--info); color: #fff; }
audio { width: 100%; margin-top: 4px; }

.step2 { opacity: .35; pointer-events: none; display: flex; flex-direction: column; gap: 12px; }
.step2.active { opacity: 1; pointer-events: auto; }
.hint { font-size: 12px; color: var(--text-dimmer); line-height: 1.6; }
.divider { border-top: 1px solid var(--border); margin: 4px 0; }

@media (max-width: 700px) {
  .tool-sidebar { width: 100%; }
}