:root {
  --bg: #0f172a;
  --bg-panel: #1e293b;
  --bg-panel-2: #16233b;
  --bg-hover: #27364f;
  --border: #334155;
  --border-strong: #475569;
  --text: #f8fafc;
  --text-dim: #94a3b8;
  --text-muted: #64748b;
  --accent: #22c55e;
  --accent-hover: #16a34a;
  --accent-soft: rgba(34, 197, 94, 0.12);
  --danger: #f87171;
  --warn: #fbbf24;
  --radius: 10px;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --sans: "IBM Plex Sans", "PingFang SC", "Microsoft YaHei", -apple-system, sans-serif;
}

[data-theme="light"] {
  --bg: #f8fafc;
  --bg-panel: #ffffff;
  --bg-panel-2: #f1f5f9;
  --bg-hover: #e2e8f0;
  --border: #e2e8f0;
  --border-strong: #cbd5e1;
  --text: #0f172a;
  --text-dim: #475569;
  --text-muted: #64748b;
  --accent: #16a34a;
  --accent-hover: #15803d;
  --accent-soft: rgba(22, 163, 74, 0.1);
  --danger: #dc2626;
  --warn: #d97706;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body { height: 100%; }

body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  line-height: 1.6;
  transition: background 0.25s, color 0.25s;
}

/* ---------- Global scrollbar ---------- */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--border-strong) transparent;
}
*::-webkit-scrollbar { width: 8px; height: 8px; }
*::-webkit-scrollbar-track { background: transparent; }
*::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: 8px;
  border: 2px solid transparent;
  background-clip: padding-box;
}
*::-webkit-scrollbar-thumb:hover { background: var(--text-muted); border: 2px solid transparent; background-clip: padding-box; }
*::-webkit-scrollbar-corner { background: transparent; }

textarea::-webkit-scrollbar { width: 8px; }
textarea::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: 8px;
  border: 2px solid transparent;
  background-clip: padding-box;
}

button { font-family: inherit; }

.app { display: flex; flex-direction: column; height: 100vh; overflow: hidden; }

/* ---------- Top bar ---------- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 0 20px;
  height: 58px;
  flex-shrink: 0;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
}

.brand {
  display: flex;
  align-items: center;
  gap: 11px;
  background: none;
  border: none;
  color: var(--text);
  text-decoration: none;
  cursor: pointer;
  padding: 4px;
  border-radius: 8px;
  text-align: left;
}
.brand:hover { opacity: 0.85; }
.brand:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.brand-logo {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--accent), #0891b2);
  color: #fff;
  font-family: var(--mono);
  font-weight: 700;
  font-size: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.brand-text { display: flex; flex-direction: column; }
.brand-name { font-weight: 600; font-size: 15px; letter-spacing: 0.2px; line-height: 1.4; }
.brand-sub { font-size: 11px; color: var(--text-muted); font-family: var(--mono); line-height: 1.4; }

.topbar-right { display: flex; align-items: center; gap: 8px; }

.kbd-hint {
  display: inline-flex;
  gap: 3px;
  align-items: center;
  font-size: 11px;
  color: var(--text-muted);
  margin-right: 4px;
}
.kbd-hint kbd {
  font-family: var(--mono);
  font-size: 10px;
  padding: 1px 5px;
  border: 1px solid var(--border-strong);
  border-bottom-width: 2px;
  border-radius: 4px;
  background: var(--bg-panel-2);
  color: var(--text-dim);
}

.theme-sun, .theme-moon { width: 15px; height: 15px; }
.theme-sun { display: block; }
.theme-moon { display: none; }
[data-theme="light"] .theme-sun { display: none; }
[data-theme="light"] .theme-moon { display: block; }

/* ---------- Main / views ---------- */
.main { flex: 1; display: flex; flex-direction: column; overflow: hidden; }
.view { flex: 1; overflow-y: auto; }

/* ---------- Home: header ---------- */
.home-view { display: block; }
.home-wrap { max-width: 1080px; margin: 0 auto; padding: 28px 20px 48px; }

.home-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}
.home-head-text h1 { font-size: 24px; font-weight: 700; letter-spacing: 0.3px; }
.home-head-text p { color: var(--text-dim); margin-top: 2px; font-size: 13px; }

.search-box {
  position: relative;
  width: 280px;
  max-width: 100%;
}
.search-box svg {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  width: 16px;
  height: 16px;
  color: var(--text-muted);
  pointer-events: none;
}
.search-box input {
  width: 100%;
  padding: 9px 14px 9px 36px;
  border-radius: 9px;
  border: 1px solid var(--border);
  background: var(--bg-panel);
  color: var(--text);
  font-size: 14px;
  outline: none;
  transition: border-color 0.15s;
}
.search-box input::placeholder { color: var(--text-muted); }
.search-box input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }

/* ---------- Home: filters ---------- */
.filters { display: flex; flex-wrap: wrap; gap: 8px; justify-content: flex-start; margin-bottom: 20px; }

.chip {
  padding: 6px 16px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg-panel);
  color: var(--text-dim);
  font-size: 13px;
  cursor: pointer;
  transition: all 0.15s;
  user-select: none;
}
.chip:hover { border-color: var(--border-strong); color: var(--text); }
.chip.active { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 500; }
.chip:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.chip .count { opacity: 0.7; font-size: 11px; margin-left: 4px; }
.chip.active .count { opacity: 0.9; }

/* ---------- Home: card grid ---------- */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
}

.tool-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 14px;
  border-radius: 11px;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  color: inherit;
  text-decoration: none;
  cursor: pointer;
  text-align: left;
  transition: border-color 0.2s, background 0.2s, transform 0.2s;
}
.tool-card:hover {
  border-color: var(--accent);
  background: var(--bg-panel-2);
  transform: translateY(-2px);
}
.tool-card:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.card-icon {
  width: 36px;
  height: 36px;
  border-radius: 9px;
  background: var(--accent-soft);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.card-icon svg { width: 18px; height: 18px; }

.card-text { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.card-name { font-weight: 600; font-size: 14px; letter-spacing: 0.2px; }
.card-desc {
  font-size: 11px;
  color: var(--text-dim);
  line-height: 1.4;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.grid-empty {
  grid-column: 1 / -1;
  text-align: center;
  color: var(--text-muted);
  padding: 48px 20px;
  font-size: 13px;
}

/* ---------- Tool view ---------- */
.tool-view { display: flex; flex-direction: column; }

.toolbar {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 20px;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.btn-back { padding: 6px 12px; }
.btn-back svg { width: 15px; height: 15px; }

.toolbar-title h1 { font-size: 15px; font-weight: 600; letter-spacing: 0.2px; line-height: 1.55; }
.toolbar-title p { font-size: 12px; color: var(--text-muted); margin-top: 1px; line-height: 1.5; }

.toolbar-actions { margin-left: auto; display: flex; gap: 8px; align-items: center; }

.tool-body { flex: 1; overflow-y: auto; padding: 20px; }
.tool-body-inner { max-width: 1080px; margin: 0 auto; }

/* ---------- Buttons ---------- */
.btn {
  padding: 8px 16px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-panel);
  color: var(--text);
  font-size: 13px;
  cursor: pointer;
  transition: all 0.15s;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 500;
  user-select: none;
}

.btn svg { width: 15px; height: 15px; }

.btn:hover { border-color: var(--border-strong); background: var(--bg-hover); }
.btn:active { transform: translateY(1px); }
.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  font-weight: 600;
}

.btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }

.btn-ghost { background: none; border-color: transparent; color: var(--text-dim); }
.btn-ghost:hover { background: var(--bg-hover); color: var(--text); }

.btn-sm { padding: 5px 10px; font-size: 12px; border-radius: 6px; }

/* ---------- Tool panels ---------- */
.panel {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 16px;
  overflow: hidden;
}

.panel-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  font-size: 12px;
  font-weight: 500;
  color: var(--text-dim);
  background: var(--bg-panel-2);
}

.panel-header .spacer { flex: 1; }

.panel-title-badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 11px;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 600;
  margin-left: 6px;
}

textarea.code-input, textarea.code-output {
  width: 100%;
  background: var(--bg-panel);
  color: var(--text);
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.65;
  border: none;
  resize: vertical;
  padding: 14px;
  outline: none;
  min-height: 220px;
}

textarea.code-output { background: var(--bg-panel-2); }

textarea.code-input:focus, textarea.code-output:focus { box-shadow: inset 0 0 0 1px var(--accent); }
textarea.code-input:focus-visible, textarea.code-output:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ---------- Options row ---------- */
.options-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: flex-end;
  padding: 12px 14px;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 16px;
}

.opt-field { display: flex; flex-direction: column; gap: 4px; }
.opt-field label { font-size: 11px; color: var(--text-muted); font-weight: 500; }
.opt-field input[type="text"], .opt-field input[type="number"], .opt-field select {
  background: var(--bg-panel-2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 6px;
  padding: 6px 10px;
  font-size: 13px;
  font-family: var(--mono);
  outline: none;
  min-width: 110px;
}
.opt-field input:focus, .opt-field select:focus { border-color: var(--accent); }
.opt-field input:focus-visible, .opt-field select:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-color: var(--accent); }
.opt-field select { cursor: pointer; }

.checkbox-field { display: flex; align-items: center; gap: 6px; font-size: 13px; cursor: pointer; color: var(--text-dim); }
.checkbox-field input { accent-color: var(--accent); width: 15px; height: 15px; cursor: pointer; }

/* ---------- Diff output ---------- */
.diff-view {
  padding: 14px;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.6;
  background: var(--bg-panel-2);
  white-space: pre-wrap;
  word-break: break-all;
  min-height: 220px;
}
.diff-line { display: block; padding: 0 8px; border-radius: 3px; }
.diff-add { color: #4ade80; background: rgba(34, 197, 94, 0.1); }
.diff-del { color: var(--danger); background: rgba(248, 113, 113, 0.1); }
.diff-ctx { color: var(--text-dim); }

/* ---------- Preview (html 渲染) ---------- */
.preview-frame {
  width: 100%;
  min-height: 320px;
  border: none;
  background: #fff;
  display: block;
}

/* ---------- Time result ---------- */
.result-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  padding: 14px;
}
.result-cell {
  background: var(--bg-panel-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px 12px;
}
.result-cell .k { font-size: 11px; color: var(--text-muted); }
.result-cell .v { font-family: var(--mono); font-size: 13px; margin-top: 2px; word-break: break-all; }

/* ---------- Empty state ---------- */
.empty {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-muted);
}
.empty svg { width: 48px; height: 48px; opacity: 0.3; margin-bottom: 14px; }
.empty h2 { font-size: 16px; font-weight: 600; color: var(--text-dim); margin-bottom: 6px; }

.spinner {
  width: 24px;
  height: 24px;
  margin: 0 auto 12px;
  border: 2px solid var(--border-strong);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- Toast ---------- */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--bg-panel);
  border: 1px solid var(--accent);
  color: var(--text);
  padding: 10px 18px;
  border-radius: 8px;
  font-size: 13px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s, transform 0.25s;
  z-index: 100;
  box-shadow: 0 8px 24px rgba(0,0,0,0.3);
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.error { border-color: var(--danger); }

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .result-grid { grid-template-columns: 1fr; }
  .home-wrap { padding: 22px 16px 40px; }
}

@media (max-width: 768px) {
  .home-wrap { padding: 20px 16px 40px; }
  .home-head-text h1 { font-size: 20px; }
  .search-box { width: 100%; }
  .tool-grid { grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 10px; }
  .toolbar { padding: 12px 14px; }
  .toolbar-title p { display: none; }
  .tool-body { padding: 14px; }
  .kbd-hint { display: none; }
}

@media (max-width: 480px) {
  .topbar { padding: 0 14px; }
  .brand-sub { display: none; }
  textarea.code-input, textarea.code-output { min-height: 180px; font-size: 12px; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
}