:root {
  --font-display: "IBM Plex Mono", monospace;
  --font-body: "Inter", -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;

  /* ---- 浅色模式（默认） ---- */
  --bg: #eef1f5;
  --surface: #ffffff;
  --surface-2: #f4f6f8;
  --surface-glass: rgba(255, 255, 255, 0.72);
  --border: #dde2e8;
  --text: #171a1f;
  --text-soft: #454952;
  --muted: #6b7280;
  --amber: #b96b0a;
  --amber-fg: #201400;
  --amber-dim: #f7e2c2;
  --teal: #0f8f82;
  --teal-dim: #d9f5f0;
  --danger: #c93036;
  --danger-dim: rgba(201, 48, 54, 0.1);

  --amber-border: rgba(185, 107, 10, 0.28);
  --teal-border: rgba(15, 143, 130, 0.28);
  --danger-border: rgba(201, 48, 54, 0.25);

  --particle-dot: rgba(30, 34, 40, 0.34);
  --particle-line: rgba(30, 34, 40, 0.14);
  --particle-glow-a: rgba(185, 107, 10, 0.10);
  --particle-glow-b: rgba(15, 143, 130, 0.10);
  --row-hover: rgba(20, 24, 30, 0.03);
}

html[data-theme="dark"] {
  --bg: #18191c;
  --surface: #212226;
  --surface-2: #26282d;
  --surface-glass: rgba(24, 25, 28, 0.66);
  --border: #34363c;
  --text: #e9e7e2;
  --text-soft: #cfced2;
  --muted: #8b8d93;
  --amber: #f5a623;
  --amber-fg: #201400;
  --amber-dim: #7a5716;
  --teal: #2dd4bf;
  --teal-dim: #144b45;
  --danger: #e5484d;
  --danger-dim: rgba(229, 72, 77, 0.08);

  --amber-border: rgba(122, 87, 22, 0.7);
  --teal-border: rgba(20, 75, 69, 0.9);
  --danger-border: rgba(229, 72, 77, 0.3);

  --particle-dot: rgba(245, 214, 160, 0.55);
  --particle-line: rgba(160, 190, 200, 0.16);
  --particle-glow-a: rgba(245, 166, 35, 0.10);
  --particle-glow-b: rgba(45, 212, 191, 0.09);
  --row-hover: rgba(255, 255, 255, 0.015);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
  transition: background 0.25s ease, color 0.25s ease;
}

#bg-canvas {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  z-index: -1;
  display: block;
  background: var(--bg);
  transition: background 0.25s ease;
}

::selection { background: var(--amber); color: #ffffff; }

code {
  font-family: var(--font-display);
  background: rgba(245, 166, 35, 0.12);
  color: var(--amber);
  padding: 0.1em 0.4em;
  border-radius: 4px;
  font-size: 0.92em;
}

/* ---------- Topbar ---------- */
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  padding: 22px 32px;
  border-bottom: 1px solid var(--border);
  background: var(--surface-glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark { flex-shrink: 0; }
.brand-mark .mark-amber { stroke: var(--amber); }
.brand-mark .mark-teal { stroke: var(--teal); }
.brand-mark .mark-teal-fill { fill: var(--teal); }
.brand-text h1 {
  font-family: var(--font-display);
  font-size: 19px;
  letter-spacing: 0.02em;
  margin: 0;
}
.brand-text p {
  margin: 2px 0 0;
  font-size: 12.5px;
  color: var(--muted);
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.topbar-note {
  font-size: 12px;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 8px;
}
.dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--teal);
  box-shadow: 0 0 0 3px rgba(45, 212, 191, 0.15);
}

.theme-toggle {
  position: relative;
  width: 36px;
  height: 36px;
  border-radius: 9px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--amber);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: border-color 0.15s ease, color 0.15s ease;
}
.theme-toggle:hover { border-color: var(--amber); }
.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
  position: absolute;
  transition: opacity 0.15s ease, transform 0.25s ease;
}
.theme-toggle .icon-moon { opacity: 0; transform: rotate(-40deg) scale(0.6); }
.theme-toggle .icon-sun { opacity: 1; transform: rotate(0) scale(1); }
html[data-theme="dark"] .theme-toggle { color: var(--teal); }
html[data-theme="dark"] .theme-toggle .icon-sun { opacity: 0; transform: rotate(40deg) scale(0.6); }
html[data-theme="dark"] .theme-toggle .icon-moon { opacity: 1; transform: rotate(0) scale(1); }

/* ---------- Tabs ---------- */
.tabs {
  display: flex;
  gap: 2px;
  padding: 0 32px;
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
  background: var(--surface-glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  position: sticky;
  top: 78px;
  z-index: 9;
}
.tab {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 14px;
  color: var(--muted);
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  padding: 16px 18px;
  cursor: pointer;
  white-space: nowrap;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.tab-index {
  font-family: var(--font-display);
  color: var(--amber);
  margin-right: 8px;
  font-size: 12px;
}
.tab:hover { color: var(--text); }
.tab.active {
  color: var(--text);
  border-bottom-color: var(--amber);
}

/* ---------- Main / Panels ---------- */
main {
  max-width: 980px;
  margin: 0 auto;
  padding: 32px;
}
.panel { display: none; animation: fade-in 0.2s ease; }
.panel.active { display: block; }
@keyframes fade-in { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: translateY(0); } }

.info-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 3px solid var(--amber);
  border-radius: 8px;
  padding: 16px 20px;
  margin-bottom: 20px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--text-soft);
}
.info-card p { margin: 0 0 8px; }
.info-card p:last-child { margin-bottom: 0; }
.info-card u { text-decoration-color: var(--amber); }
.warn-note { color: var(--amber); }

/* ---------- Toolbar / fields ---------- */
.toolbar {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  align-items: flex-end;
  margin-bottom: 18px;
}
.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 12.5px;
  color: var(--muted);
  min-width: 220px;
}
.field b { color: var(--teal); font-family: var(--font-display); }
.field input[type="text"],
.field select {
  font-family: var(--font-display);
  font-size: 13px;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 9px 10px;
}
.field input[type="range"] {
  accent-color: var(--amber);
}
.field-note {
  font-size: 12px;
  color: var(--muted);
  align-self: center;
  margin-bottom: 9px;
}

/* ---------- Dropzone ---------- */
.dropzone {
  border: 1.5px dashed var(--border);
  border-radius: 12px;
  background: linear-gradient(180deg, rgba(255,255,255,0.015), transparent);
  padding: 38px 20px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease;
  margin-bottom: 18px;
}
.dropzone:hover, .dropzone.drag-over {
  border-color: var(--amber);
  background: rgba(245, 166, 35, 0.04);
}
.dropzone-icon {
  width: 34px; height: 34px;
  line-height: 34px;
  margin: 0 auto 10px;
  border-radius: 50%;
  border: 1px solid var(--border);
  color: var(--amber);
  font-size: 18px;
}
.dropzone-inner p { margin: 4px 0; font-size: 14px; }
.dropzone-sub { color: var(--muted); font-size: 12.5px !important; }

/* ---------- File table ---------- */
.list-wrap {
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  margin-bottom: 16px;
}
.file-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.file-table th {
  text-align: left;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 11px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
  background: var(--surface-2);
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
}
.file-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}
.file-table tr:last-child td { border-bottom: none; }
.file-table tr:hover td { background: var(--row-hover); }
.fname { font-family: var(--font-display); font-size: 12.5px; }
.fsub { color: var(--muted); font-size: 11.5px; }

.chip {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-family: var(--font-display);
  font-size: 11px;
  padding: 3px 9px;
  border-radius: 20px;
  border: 1px solid var(--border);
  color: var(--muted);
}
.chip.pending { color: var(--muted); }
.chip.done { color: var(--teal); border-color: var(--teal-border); background: var(--teal-dim); }
.chip.error { color: var(--danger); border-color: var(--danger-border); background: var(--danger-dim); }
.chip.processing { color: var(--amber); border-color: var(--amber-border); background: var(--amber-dim); }

.row-btn {
  font-family: var(--font-body);
  font-size: 12px;
  color: var(--teal);
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}
.row-btn:disabled { color: var(--muted); cursor: default; }
.row-remove { color: var(--danger); margin-left: 10px; }

/* ---------- Action bar ---------- */
.action-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.btn {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 13.5px;
  border-radius: 7px;
  padding: 10px 18px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform 0.08s ease, opacity 0.15s ease;
}
.btn:active { transform: scale(0.98); }
.btn:disabled { opacity: 0.45; cursor: default; }
.btn-primary { background: var(--amber); color: var(--amber-fg); }
.btn-primary:hover:not(:disabled) { opacity: 0.9; }
.btn-ghost { background: transparent; border-color: var(--teal-border); color: var(--teal); }
.btn-ghost:hover:not(:disabled) { background: var(--teal-dim); }
.btn-text { background: none; color: var(--muted); }
.btn-text:hover { color: var(--text); }

.progress-text {
  font-family: var(--font-display);
  font-size: 12px;
  color: var(--muted);
}

footer {
  max-width: 980px;
  margin: 20px auto 60px;
  padding: 0 32px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.6;
}

@media (max-width: 640px) {
  .topbar, main, footer { padding-left: 16px; padding-right: 16px; }
  .file-table { font-size: 12px; }
  .file-table th:nth-child(2), .file-table td:nth-child(2) { display: none; }
}