:root {
  --bg: #ffffff;
  --card: #ffffff;
  --text: #101622;
  --muted: #6b7280;
  --accent: #2563eb;
  --accent-2: #1d4ed8;
  --danger: #ef4444;
  --border: #e5e7eb;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji";
  background: var(--bg);
  color: var(--text);
}

/* 重要：不要全局覆盖 header/section/footer 的边框与背景，
   避免影响站点导航栏样式（边框丢失、背景透明等）。
   若需要限制内容宽度，请依赖页面中的容器类（如 max-w-6xl）。 */

h1, h2 { margin: 0 0 12px; }
p.hint { color: var(--muted); margin: 8px 0 0; }

.upload-controls, .output-controls, .pair-actions {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}

.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: #ffffff;
  color: #101622;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  cursor: pointer;
}
.btn:hover { background: #f9fafb; }
.btn input[type="file"] { display: none; }
.btn.primary { background: #ffffff; border-color: #e5e7eb; color: #101622; }
.btn.secondary { background: #ffffff; border-color: #e5e7eb; color: #101622; }
.btn:disabled { opacity: 0.6; cursor: not-allowed; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}
th, td {
  border-bottom: 1px solid var(--border);
  padding: 10px 8px;
  text-align: left;
}
thead th { color: var(--muted); font-weight: 600; background: #f8fafc; }
.th-sort {
  background: transparent;
  border: none;
  color: var(--text);
  font: inherit;
  cursor: pointer;
  padding: 0;
}
.th-sort.asc::after { content: ' \2191'; color: var(--muted); }
.th-sort.desc::after { content: ' \2193'; color: var(--muted); }

.op-group { margin: 10px 0; }
.sub-options { margin: 8px 0 0 22px; display: grid; gap: 6px; }

.pairs { display: grid; gap: 10px; margin-top: 10px; }
.pair-row {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 8px;
  align-items: center;
}
.pair-row select {
  width: 100%;
  padding: 8px;
  background: #ffffff;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
}
.file-op-select,
table select {
  width: 100%;
  padding: 6px 8px;
  background: #ffffff;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
}
.pair-row .remove { color: #101622; background: #ffffff; border-color: #e5e7eb; }

.auto-op-hint {
  color: var(--accent-2);
  font-size: 12px;
  margin-left: 8px;
}

.progress {
  width: 100%;
  height: 10px;
  background: #e5e7eb;
  border-radius: 999px;
  overflow: hidden;
  margin-top: 12px;
}
.progress .bar {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  width: 0%;
}

.log {
  margin-top: 14px;
  font-size: 12px;
  line-height: 1.6;
}
.log .ok { color: #0f766e; }
.log .warn { color: #a16207; }
.log .err { color: var(--danger); }
.log a { color: var(--accent); text-decoration: none; }

/* Floating Log Button */
.log-fab {
  position: fixed;
  right: 20px;
  bottom: 20px;
  width: 48px;
  height: 48px;
  border-radius: 9999px;
  background: #000000;
  color: #ffffff;
  border: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 24px rgba(16,22,34,0.12);
  cursor: pointer;
  z-index: 60;
}
.log-fab:hover { filter: brightness(1.05); }

/* Log overlay panel */
.log-overlay {
  position: fixed;
  right: 20px;
  bottom: 80px;
  width: 420px;
  max-height: 60vh;
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 12px 32px rgba(16,22,34,0.18);
  z-index: 60;
  display: flex;
  flex-direction: column;
}
.log-overlay-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
}
.log-overlay-header .close {
  background: transparent;
  border: none;
  color: var(--muted);
  font-size: 18px;
  cursor: pointer;
}
.log-overlay-body {
  padding: 10px 12px;
  overflow-y: auto;
  font-size: 12px;
  line-height: 1.6;
}

footer { text-align: center; color: var(--muted); }

/* Done toast */
.done-toast {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: #10b981; /* green */
  color: #ffffff;
  border-radius: 9999px;
  padding: 10px 16px;
  font-size: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
  box-shadow: 0 12px 28px rgba(16,22,34,0.18);
  z-index: 70;
  opacity: 0;
  pointer-events: none;
  transition: opacity 200ms ease-out;
}
.done-toast.show { opacity: 1; }