/* ════════════════════════════════════════
   主題變數 — 淺色（預設）
   ════════════════════════════════════════ */
:root {
  --bg-base:      #f4f6f9;
  --bg-surface:   #ffffff;
  --bg-elevated:  #f0f2f6;
  --bg-hover:     #e8eaf0;
  --border:       rgba(0,0,0,0.08);
  --border-active:rgba(15,144,128,0.45);
  --text-primary: #17202e;
  --text-secondary:#5a6478;
  --text-muted:   #9aa3b5;
  --accent:       #0e8c7c;
  --accent-glow:  rgba(14,140,124,0.15);
  --accent-dim:   rgba(14,140,124,0.09);
  --orange:       #d95f08;
  --orange-dim:   rgba(217,95,8,0.09);
  --yellow:       #b58000;
  --yellow-dim:   rgba(181,128,0,0.09);
  --blue:         #2563eb;
  --blue-dim:     rgba(37,99,235,0.09);
  --lime:         #4d8700;
  --lime-dim:     rgba(77,135,0,0.09);
  --red:          #c92020;
  --red-dim:      rgba(201,32,32,0.10);
  --title-grad:   linear-gradient(135deg, #17202e 0%, #4a5568 100%);
  --body-grad1:   rgba(14,140,124,0.08);
  --body-grad2:   rgba(217,95,8,0.06);
  --scrollbar:    rgba(0,0,0,0.12);
  --scrollbar-h:  rgba(0,0,0,0.22);
  --shadow:       0 1px 3px rgba(0,0,0,0.06), 0 4px 16px rgba(0,0,0,0.04);
  --radius-sm: 10px;
  --radius-md: 14px;
  --radius-xl: 28px;
}

/* ════════════════════════════════════════
   深色：當系統偏好深色 且 未手動選主題 時
   ════════════════════════════════════════ */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg-base:       #0f1117;
    --bg-surface:    #181c27;
    --bg-elevated:   #1e2333;
    --bg-hover:      #252b3d;
    --border:        rgba(255,255,255,0.07);
    --border-active: rgba(99,179,161,0.45);
    --text-primary:  #e8eaf0;
    --text-secondary:#8892a4;
    --text-muted:    #4e5668;
    --accent:        #63b3a1;
    --accent-glow:   rgba(99,179,161,0.18);
    --accent-dim:    rgba(99,179,161,0.12);
    --orange:        #fb923c;
    --orange-dim:    rgba(249,115,22,0.12);
    --yellow:        #fbbf24;
    --yellow-dim:    rgba(234,179,8,0.12);
    --blue:          #60a5fa;
    --blue-dim:      rgba(96,165,250,0.12);
    --lime:          #84cc16;
    --lime-dim:      rgba(132,204,22,0.12);
    --red:           #f87171;
    --red-dim:       rgba(248,113,113,0.14);
    --title-grad:    linear-gradient(135deg, #e8eaf0 0%, #a0aec0 100%);
    --body-grad1:    rgba(99,179,161,0.10);
    --body-grad2:    rgba(249,115,22,0.07);
    --scrollbar:     rgba(255,255,255,0.10);
    --scrollbar-h:   rgba(255,255,255,0.18);
    --shadow:        none;
  }
}

/* ════════════════════════════════════════
   深色：手動強制
   ════════════════════════════════════════ */
[data-theme="dark"] {
  --bg-base:       #0f1117;
  --bg-surface:    #181c27;
  --bg-elevated:   #1e2333;
  --bg-hover:      #252b3d;
  --border:        rgba(255,255,255,0.07);
  --border-active: rgba(99,179,161,0.45);
  --text-primary:  #e8eaf0;
  --text-secondary:#8892a4;
  --text-muted:    #4e5668;
  --accent:        #63b3a1;
  --accent-glow:   rgba(99,179,161,0.18);
  --accent-dim:    rgba(99,179,161,0.12);
  --orange:        #fb923c;
  --orange-dim:    rgba(249,115,22,0.12);
  --yellow:        #fbbf24;
  --yellow-dim:    rgba(234,179,8,0.12);
  --blue:          #60a5fa;
  --blue-dim:      rgba(96,165,250,0.12);
  --lime:          #84cc16;
  --lime-dim:      rgba(132,204,22,0.12);
  --red:           #f87171;
  --red-dim:       rgba(248,113,113,0.14);
  --title-grad:    linear-gradient(135deg, #e8eaf0 0%, #a0aec0 100%);
  --body-grad1:    rgba(99,179,161,0.10);
  --body-grad2:    rgba(249,115,22,0.07);
  --scrollbar:     rgba(255,255,255,0.10);
  --scrollbar-h:   rgba(255,255,255,0.18);
  --shadow:        none;
}

/* ════════════════════════════════════════
   淺色：手動強制（確保覆蓋系統深色）
   ════════════════════════════════════════ */
[data-theme="light"] {
  --bg-base:       #f4f6f9;
  --bg-surface:    #ffffff;
  --bg-elevated:   #f0f2f6;
  --bg-hover:      #e8eaf0;
  --border:        rgba(0,0,0,0.08);
  --border-active: rgba(15,144,128,0.45);
  --text-primary:  #17202e;
  --text-secondary:#5a6478;
  --text-muted:    #9aa3b5;
  --accent:        #0e8c7c;
  --accent-glow:   rgba(14,140,124,0.15);
  --accent-dim:    rgba(14,140,124,0.09);
  --orange:        #d95f08;
  --orange-dim:    rgba(217,95,8,0.09);
  --yellow:        #b58000;
  --yellow-dim:    rgba(181,128,0,0.09);
  --blue:          #2563eb;
  --blue-dim:      rgba(37,99,235,0.09);
  --lime:          #4d8700;
  --lime-dim:      rgba(77,135,0,0.09);
  --red:           #c92020;
  --red-dim:       rgba(201,32,32,0.10);
  --title-grad:    linear-gradient(135deg, #17202e 0%, #4a5568 100%);
  --body-grad1:    rgba(14,140,124,0.08);
  --body-grad2:    rgba(217,95,8,0.06);
  --scrollbar:     rgba(0,0,0,0.12);
  --scrollbar-h:   rgba(0,0,0,0.22);
  --shadow:        0 1px 3px rgba(0,0,0,0.06), 0 4px 16px rgba(0,0,0,0.04);
}

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

html { transition: background-color 0.2s, color 0.2s; }

body {
  min-height: 100vh;
  font-family: "Inter", "Noto Sans TC", "Microsoft JhengHei", sans-serif;
  color: var(--text-primary);
  background-color: var(--bg-base);
  background-image:
    radial-gradient(ellipse 70% 50% at 15% 0%,   var(--body-grad1) 0%, transparent 55%),
    radial-gradient(ellipse 60% 40% at 85% 100%, var(--body-grad2) 0%, transparent 50%);
  padding: 32px 24px;
  transition: background-color 0.25s, color 0.25s;
}

/* ── Shell ── */
.shell {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* ── Header ── */
.header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.header-left { flex: 1; min-width: 280px; }

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border-radius: 999px;
  background: var(--accent-dim);
  border: 1px solid rgba(99,179,161,0.22);
  color: var(--accent);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 10px;
}

.badge::before {
  content: "";
  display: inline-block;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 6px var(--accent);
}

.title {
  font-size: clamp(22px, 3.5vw, 34px);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  background: var(--title-grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.6;
  margin-top: 8px;
}

/* ── Theme Switcher ── */
.theme-switcher {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 4px;
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  flex-shrink: 0;
  margin-top: 4px;
}

.theme-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  appearance: none;
  border: 1px solid transparent;
  border-radius: 8px;
  cursor: pointer;
  font-family: inherit;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  background: transparent;
  padding: 6px 10px;
  transition: all 0.15s ease;
  white-space: nowrap;
}

.theme-btn svg {
  width: 14px; height: 14px;
  flex-shrink: 0;
}

.theme-btn:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
}

.theme-btn.is-active {
  background: var(--bg-surface);
  border-color: var(--border);
  color: var(--text-primary);
  box-shadow: var(--shadow);
}

/* ── Main Card ── */
.editor-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: background-color 0.25s, border-color 0.25s;
}

/* ── Toolbar ── */
.toolbar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
  background: var(--bg-elevated);
  transition: background-color 0.25s, border-color 0.25s;
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  appearance: none;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-family: inherit;
  font-size: 13px;
  font-weight: 600;
  padding: 8px 14px;
  transition: all 0.15s ease;
  white-space: nowrap;
}

.btn-icon { font-size: 14px; line-height: 1; }

.btn-upper  { background: var(--orange-dim); border-color: rgba(217,95,8,0.18);   color: var(--orange); }
.btn-lower  { background: var(--accent-dim); border-color: rgba(14,140,124,0.18); color: var(--accent); }
.btn-title  { background: var(--yellow-dim); border-color: rgba(181,128,0,0.18);  color: var(--yellow); }
.btn-name   { background: var(--blue-dim);   border-color: rgba(37,99,235,0.18);  color: var(--blue);   }
.btn-snake  { background: var(--lime-dim);   border-color: rgba(77,135,0,0.18);   color: var(--lime);   }

.btn-upper:hover  { background: rgba(217,95,8,0.18);   border-color: rgba(217,95,8,0.36);   transform: translateY(-1px); }
.btn-lower:hover  { background: rgba(14,140,124,0.18); border-color: rgba(14,140,124,0.36); transform: translateY(-1px); }
.btn-title:hover  { background: rgba(181,128,0,0.18);  border-color: rgba(181,128,0,0.36);  transform: translateY(-1px); }
.btn-name:hover   { background: rgba(37,99,235,0.18);  border-color: rgba(37,99,235,0.36);  transform: translateY(-1px); }
.btn-snake:hover  { background: rgba(77,135,0,0.18);   border-color: rgba(77,135,0,0.36);   transform: translateY(-1px); }

.btn-ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--text-secondary);
}
.btn-ghost:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  transform: translateY(-1px);
}

.btn:active { transform: translateY(0) !important; opacity: 0.82; }

/* ── Textarea ── */
.textarea-wrap { padding: 16px; }

textarea {
  width: 100%;
  min-height: 400px;
  resize: vertical;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg-base);
  color: var(--text-primary);
  font-family: "Inter", "Noto Sans TC", monospace;
  font-size: 17px;
  line-height: 1.7;
  padding: 18px 20px;
  outline: none;
  caret-color: var(--accent);
  transition: border-color 0.2s, box-shadow 0.2s, background-color 0.25s, color 0.25s;
}

textarea:focus {
  border-color: var(--border-active);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

textarea::placeholder { color: var(--text-muted); }

/* ── Footer Bar ── */
.footer-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  border-top: 1px solid var(--border);
  background: var(--bg-elevated);
  flex-wrap: wrap;
  transition: background-color 0.25s, border-color 0.25s;
}

.action-group { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }

.limit-group  { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }

.limit-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  white-space: nowrap;
}

.limit-input {
  width: 110px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-base);
  color: var(--text-primary);
  font: inherit;
  font-size: 14px;
  font-weight: 600;
  padding: 8px 12px;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s, background-color 0.25s, color 0.25s;
}

.limit-input:focus {
  border-color: var(--border-active);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.limit-input::placeholder { color: var(--text-muted); }

/* ── Stats Grid ── */
.stats-panel {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 20px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  box-shadow: var(--shadow);
  transition: background-color 0.25s, border-color 0.25s;
}

.stat-group {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  transition: background-color 0.25s, border-color 0.25s;
}

.stat-group__label {
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: 10px;
}

.stat-items { display: flex; flex-direction: column; gap: 6px; }

.stat-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.stat-name { font-size: 13px; color: var(--text-secondary); white-space: nowrap; }

.stat-value {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
  transition: color 0.2s;
}

.stat-value.is-over { color: var(--red) !important; }

/* Limit group */
.stat-group--limit {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
}

.limit-display {
  font-size: 30px;
  font-weight: 800;
  line-height: 1;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
  margin-bottom: 5px;
  transition: color 0.2s;
}

.limit-display.is-over { color: var(--red); }

.limit-sublabel { font-size: 12px; color: var(--text-secondary); }

/* State group */
.stat-group--state {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
}

.status-icon { font-size: 28px; line-height: 1; margin-bottom: 8px; }

.status-text { font-size: 14px; font-weight: 700; color: var(--text-primary); }

/* ── Content Card ── */
.content-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 22px 24px;
  box-shadow: var(--shadow);
  transition: background-color 0.25s, border-color 0.25s;
}

.seo-content h2 {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.seo-content p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-secondary);
}

.seo-content p + p {
  margin-top: 10px;
}

.seo-content ul {
  margin-top: 14px;
  padding-left: 20px;
  color: var(--text-secondary);
  display: grid;
  gap: 8px;
}

.seo-content li {
  line-height: 1.7;
}

.seo-content code {
  font-family: "JetBrains Mono", "Consolas", monospace;
  font-size: 0.95em;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 2px 6px;
  color: var(--accent);
}

/* ── Scrollbar ── */
textarea::-webkit-scrollbar { width: 6px; }
textarea::-webkit-scrollbar-track { background: transparent; }
textarea::-webkit-scrollbar-thumb { background: var(--scrollbar); border-radius: 3px; }
textarea::-webkit-scrollbar-thumb:hover { background: var(--scrollbar-h); }

/* ── Responsive ── */
@media (max-width: 880px) {
  .stats-panel { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  body { padding: 16px 14px; }
  .stats-panel { grid-template-columns: 1fr 1fr; gap: 10px; padding: 14px; }
  .content-card { padding: 16px; }
  textarea { min-height: 300px; font-size: 15px; }
  .toolbar { gap: 6px; }
  .btn { font-size: 12px; padding: 7px 11px; }
  .footer-bar { gap: 10px; }
  .limit-group { flex-wrap: wrap; }
  .theme-btn span { display: none; }
}