/* ================================
   文字转语音工具 - 自定义样式
   配色与 Leowh 主页统一
   ================================ */

:root {
  --bg: #FAFAF9;
  --bg-alt: #F5F5F4;
  --surface: #FFFFFF;
  --border: #E7E5E4;
  --border-strong: #D6D3D1;
  --text: #1E293B;
  --text-secondary: #52525B;
  --text-muted: #71717A;
  --primary: #4F46E5;
  --primary-hover: #4338CA;
  --primary-light: rgba(79, 70, 229, 0.08);
  --secondary: #F97316;
  --accent: #EC4899;
  --success: #059669;
  --radius: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.08);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', 'Noto Sans SC', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* ── Toast ── */
.toast {
  position: fixed; top: 24px; right: 24px;
  background: var(--text); color: var(--bg);
  padding: 10px 18px; border-radius: 100px;
  font-size: 14px; font-weight: 500;
  display: flex; align-items: center; gap: 8px;
  z-index: 1000;
  transform: translateX(calc(100% + 40px));
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  box-shadow: 0 4px 16px rgba(0,0,0,0.12);
}
.toast.show { transform: translateX(0); }
.toast-dot { width: 8px; height: 8px; background: var(--success); border-radius: 50%; }

/* ── Page ── */
.page { max-width: 960px; margin: 0 auto; padding: 0 32px; }

/* ── Header scroll effect ── */
#header.scrolled {
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 2px 20px rgba(0,0,0,0.06);
}

/* ══════════════════════════════════════════
   TTS Section
   ══════════════════════════════════════════ */
.tts-section { padding: 32px 0 24px; }

.tts-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: box-shadow 0.3s ease;
}
.panel:hover {
  box-shadow: 0 8px 30px rgba(0,0,0,0.08);
}

.panel-header {
  display: flex; justify-content: space-between; align-items: center;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-alt);
}

.panel-title {
  font-size: 16px; font-weight: 700;
  color: var(--text);
}

.panel-body { padding: 20px; }

/* ── Text Input ── */
.text-input {
  width: 100%; min-height: 260px;
  padding: 14px 16px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-family: inherit; font-size: 15px; color: var(--text);
  line-height: 1.8;
  resize: vertical;
  transition: all 0.2s ease;
  outline: none;
}
.text-input:focus {
  border-color: var(--primary);
  background: var(--surface);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}
.text-input::placeholder { color: #9CA3AF; }

.char-count {
  font-size: 11px; font-weight: 600;
  color: var(--text-muted);
  background: var(--bg-alt);
  padding: 4px 10px; border-radius: 100px;
}

.panel-toolbar {
  display: flex; gap: 8px; margin-top: 12px;
}

.btn-sm {
  padding: 7px 16px;
  border: 1px solid var(--border);
  border-radius: 100px;
  font-family: inherit; font-size: 12px; font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
}
.btn-clear {
  background: transparent;
  color: var(--text-muted);
}
.btn-clear:hover { background: var(--bg-alt); border-color: var(--border-strong); }
.btn-example {
  background: rgba(139,92,246,0.06);
  border-color: rgba(139,92,246,0.15);
  color: #8B5CF6;
}
.btn-example:hover { background: rgba(139,92,246,0.12); }

/* ── Control Group ── */
.control-group {
  margin-bottom: 18px;
}
.control-label {
  display: flex; justify-content: space-between; align-items: center;
  font-size: 13px; font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 6px;
}
.control-value {
  font-family: 'SF Mono', 'Cascadia Code', 'Fira Code', monospace;
  font-size: 12px; color: var(--primary);
  font-weight: 600;
}

.select-field {
  width: 100%;
  padding: 10px 14px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-family: inherit; font-size: 14px; color: var(--text);
  transition: all 0.2s ease;
  outline: none;
  cursor: pointer;
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%2371717A' d='M1.41 0L6 4.58 10.59 0 12 1.41l-6 6-6-6z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 36px;
}
.select-field:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

/* ── Slider ── */
.slider {
  width: 100%;
  height: 6px;
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  border-radius: 100px;
  outline: none;
  background: var(--bg-alt);
  border: 1px solid var(--border);
}
.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px; height: 20px;
  border-radius: 50%;
  background: var(--primary);
  cursor: pointer;
  box-shadow: 0 2px 6px rgba(79,70,229,0.3);
  transition: box-shadow 0.15s ease;
}
.slider::-webkit-slider-thumb:hover {
  box-shadow: 0 4px 12px rgba(79,70,229,0.4);
}
.slider::-moz-range-thumb {
  width: 20px; height: 20px;
  border-radius: 50%; border: none;
  background: var(--primary);
  cursor: pointer;
  box-shadow: 0 2px 6px rgba(79,70,229,0.3);
}

.slider-labels {
  display: flex; justify-content: space-between;
  margin-top: 4px;
  font-size: 10px; color: var(--text-muted);
}

/* ── Playback Info ── */
.playback-info {
  margin-bottom: 16px;
  padding: 10px 14px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.playback-progress {
  height: 4px;
  background: var(--border);
  border-radius: 100px;
  overflow: hidden;
  margin-bottom: 6px;
}
.playback-progress-bar {
  height: 100%; width: var(--tts-progress, 0%);
  background: var(--primary);
  border-radius: 100px;
  transition: width 0.1s linear;
}
.playback-text {
  font-size: 11px; color: var(--text-muted);
}

/* ── Action Buttons ── */
.action-buttons {
  display: flex; gap: 8px;
}
.btn-action {
  flex: 1;
  display: flex; align-items: center; justify-content: center; gap: 6px;
  padding: 11px 16px;
  border: none; border-radius: var(--radius);
  font-family: inherit; font-size: 14px; font-weight: 600;
  color: white; cursor: pointer;
  transition: all 0.15s ease;
}
.btn-action:disabled {
  opacity: 0.35; cursor: not-allowed;
}

.btn-play {
  background: linear-gradient(135deg, #8B5CF6, #7C3AED);
  box-shadow: 0 2px 8px rgba(139,92,246,0.3);
}
.btn-play:hover:not(:disabled) {
  box-shadow: 0 4px 16px rgba(139,92,246,0.4);
  transform: translateY(-1px);
}

.btn-pause {
  background: linear-gradient(135deg, #F59E0B, #EA580C);
  box-shadow: 0 2px 8px rgba(245,158,11,0.3);
}
.btn-pause:hover:not(:disabled) {
  box-shadow: 0 4px 16px rgba(245,158,11,0.4);
  transform: translateY(-1px);
}

.btn-stop {
  background: linear-gradient(135deg, #EF4444, #DC2626);
  box-shadow: 0 2px 8px rgba(239,68,68,0.3);
}
.btn-stop:hover:not(:disabled) {
  box-shadow: 0 4px 16px rgba(239,68,68,0.4);
  transform: translateY(-1px);
}

.browser-note {
  text-align: center; margin-top: 12px;
  font-size: 12px; color: var(--secondary);
  font-weight: 500;
}

/* ══════════════════════════════════════════
   Custom scrollbar
   ══════════════════════════════════════════ */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: #f1f5f9; }
::-webkit-scrollbar-thumb { background: #A5B4FC; border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: #4F46E5; }

::selection { background: rgba(79, 70, 229, 0.2); color: #1E293B; }

/* ══════════════════════════════════════════
   Guide Section (accordion)
   ══════════════════════════════════════════ */
.guide-section {
  margin-top: 16px;
  margin-bottom: 64px;
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}
.guide-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 14px 20px;
  background: none;
  border: none;
  cursor: pointer;
  transition: background 0.15s ease;
}
.guide-toggle:hover {
  background: var(--bg-alt);
}
.guide-toggle-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 600;
  color: #1E293B;
}
.guide-toggle.open .toggle-arrow {
  transform: rotate(180deg);
}
.toggle-arrow {
  transition: transform 0.2s ease;
  color: var(--text-muted);
}
.guide-list {
  padding: 0 20px 20px;
}
.guide-list.hidden {
  display: none;
}
.guide-item {
  padding: 16px 0;
  border-top: 1px solid var(--border);
}
.guide-item:first-child {
  border-top: 1px solid var(--border);
}
.guide-item-title {
  font-size: 14px;
  font-weight: 600;
  color: #1E293B;
  margin-bottom: 6px;
}
.guide-item-body {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* ══════════════════════════════════════════
   Responsive
   ══════════════════════════════════════════ */
@media (max-width: 768px) {
  .page { padding: 0 16px; }

  .tts-grid { grid-template-columns: 1fr; }

  .text-input { min-height: 200px; }

  .action-buttons { flex-wrap: wrap; }
  .btn-action { flex: 1 1 auto; }
}