/* ================================
   中英混排优化 - 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; }

/* ── 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; }

/* ── Tool Main ── */
.tool-main { padding: 32px 0; display: flex; flex-direction: column; gap: 20px; }

/* ── Editor Panels ── */
.editor-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.panel-header-row {
  display: flex; justify-content: space-between; align-items: center;
  padding: 14px 20px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-alt);
}

.panel-label {
  font-size: 14px; font-weight: 600; color: var(--text);
  display: flex; align-items: center; gap: 8px;
}

.stat-badge {
  font-size: 12px; font-weight: 500; color: var(--text-muted);
  background: var(--bg); padding: 2px 10px;
  border-radius: 100px;
  border: 1px solid var(--border);
}

.panel-actions { display: flex; gap: 8px; }

.btn-secondary {
  padding: 7px 16px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 100px;
  font-family: inherit; font-size: 13px; font-weight: 500;
  color: var(--text-muted); cursor: pointer;
  transition: all 0.15s ease;
  white-space: nowrap;
}
.btn-secondary:hover {
  background: var(--primary-light);
  border-color: rgba(79,70,229,0.25);
  color: var(--primary);
}

.editor-textarea {
  width: 100%; padding: 16px 20px;
  background: var(--bg);
  border: none; outline: none;
  font-family: inherit; font-size: 15px; color: var(--text);
  line-height: 1.8;
  resize: vertical;
  min-height: 170px;
}
.editor-textarea::placeholder { color: #9CA3AF; }
.editor-textarea:focus { background: var(--surface); }

/* ── Output Display ── */
.output-display {
  padding: 20px;
  font-size: 15px; line-height: 2; color: var(--text);
  min-height: 100px;
  white-space: pre-wrap; word-wrap: break-word;
}
.output-display:empty::after {
  content: '优化结果将显示在这里...';
  color: #9CA3AF; font-size: 14px;
}

/* ── Convert Actions ── */
.convert-actions {
  display: flex; justify-content: center; gap: 12px;
}

.btn-convert {
  padding: 14px 32px;
  background: var(--primary);
  border: 1px solid transparent;
  border-radius: 100px;
  font-family: inherit; font-size: 15px; font-weight: 600;
  color: white; cursor: pointer;
  transition: background 0.15s ease, box-shadow 0.15s ease, transform 0.15s ease;
  white-space: nowrap;
  box-shadow: 0 1px 3px rgba(0,0,0,0.06), 0 0 0 1px rgba(0,0,0,0.04);
}
.btn-convert:hover {
  background: #4338CA;
  box-shadow: 0 4px 12px rgba(0,0,0,0.10), 0 0 0 1px rgba(0,0,0,0.04);
  transform: translateY(-1px);
}
.btn-convert:active { transform: translateY(0); box-shadow: 0 1px 2px rgba(0,0,0,0.06); }

/* ── Compare Panel ── */
.compare-body {
  display: flex; align-items: stretch;
  gap: 0; padding: 0;
}
.compare-col {
  flex: 1; min-width: 0; padding: 20px;
}
.compare-col:first-child { border-right: 1px solid var(--border); }
.compare-label {
  font-size: 11px; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 10px;
}
.compare-content {
  font-size: 14px; line-height: 1.9; color: var(--text);
  white-space: pre-wrap; word-wrap: break-word;
}
.compare-separator {
  display: flex; align-items: center;
  padding: 0 4px;
  color: var(--primary);
  flex-shrink: 0;
}

/* ── Highlighted space for compare view ── */
.space-highlight {
  background: rgba(79, 70, 229, 0.15);
  border-radius: 2px;
  display: inline;
}

/* ── Guide Section ── */
.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;
}
.guide-item-body kbd {
  padding: 1px 6px;
  background: var(--bg-alt);
  border: 1px solid var(--border-strong);
  border-radius: 4px;
  font-family: 'SF Mono', 'Cascadia Code', monospace;
  font-size: 12px;
  color: var(--text-secondary);
}

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

  .panel-header-row {
    flex-direction: column; gap: 10px; align-items: flex-start;
  }

  .compare-body { flex-direction: column; }
  .compare-col:first-child { border-right: none; border-bottom: 1px solid var(--border); }
  .compare-separator {
    transform: rotate(90deg);
    padding: 10px 0;
    justify-content: center;
  }

  .convert-actions { flex-direction: column; align-items: stretch; }
}