/* ═══════════════════════════════════════════════
   Markdown to HTML Email — Emerald Dark Theme
   ═══════════════════════════════════════════════ */

:root {
  --primary: #10B981;
  --primary-hover: #059669;
  --secondary: #34D399;
  --accent: #8B5CF6;
  --bg: #0A1A14;
  --bg-elevated: #0F261C;
  --bg-card: #132E22;
  --bg-input: #0D2018;
  --text: #E2E8F0;
  --text-muted: #94A3B8;
  --text-dim: #64748B;
  --border: #1E3A2C;
  --border-hover: #2D5A42;
  --radius: 12px;
  --radius-sm: 8px;
  --font: 'Inter', system-ui, -apple-system, sans-serif;
  --transition: 200ms ease;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.6);
}

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

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow: hidden;
}

/* ─── App Layout ──────────────────────────── */

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

/* ─── Header ──────────────────────────────── */

.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
  gap: 16px;
  flex-shrink: 0;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.15), rgba(139, 92, 246, 0.1));
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.header-title {
  font-size: 1.1rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.header-badge {
  font-size: 0.65rem;
  font-weight: 600;
  padding: 3px 8px;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.2);
  border-radius: 20px;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

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

/* ─── Buttons ─────────────────────────────── */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  font-size: 0.8rem;
  font-weight: 500;
  font-family: var(--font);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-hover));
  color: white;
  box-shadow: 0 2px 8px rgba(16, 185, 129, 0.3);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(16, 185, 129, 0.4);
}

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
}

.btn-ghost:hover {
  background: var(--bg-card);
  color: var(--text);
  border-color: var(--border-hover);
}

/* ─── Toolbar ─────────────────────────────── */

.toolbar {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 8px 20px;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  flex-wrap: wrap;
}

.toolbar-group {
  display: flex;
  align-items: center;
  gap: 6px;
}

.toolbar-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 500;
}

.toolbar-input {
  padding: 5px 10px;
  font-size: 0.8rem;
  font-family: var(--font);
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  width: 240px;
  transition: border-color var(--transition);
}

.toolbar-input:focus {
  outline: none;
  border-color: var(--primary);
}

.toolbar-select {
  padding: 5px 10px;
  font-size: 0.8rem;
  font-family: var(--font);
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  cursor: pointer;
}

.toolbar-select:focus {
  outline: none;
  border-color: var(--primary);
}

.compatibility-badges {
  display: flex;
  gap: 6px;
  margin-left: auto;
}

.badge {
  font-size: 0.65rem;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

.badge-gmail {
  background: rgba(234, 67, 53, 0.1);
  color: #EA4335;
  border: 1px solid rgba(234, 67, 53, 0.2);
}

.badge-outlook {
  background: rgba(0, 120, 212, 0.1);
  color: #0078D4;
  border: 1px solid rgba(0, 120, 212, 0.2);
}

.badge-apple {
  background: rgba(52, 199, 89, 0.1);
  color: #34C759;
  border: 1px solid rgba(52, 199, 89, 0.2);
}

/* ─── Main Content ────────────────────────── */

.main {
  display: grid;
  grid-template-columns: 1fr 1fr;
  flex: 1;
  overflow: hidden;
  gap: 1px;
  background: var(--border);
}

.panel {
  display: flex;
  flex-direction: column;
  background: var(--bg);
  overflow: hidden;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.panel-title {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
}

.panel-stat {
  font-size: 0.7rem;
  color: var(--text-dim);
}

/* ─── Editor ──────────────────────────────── */

.editor {
  flex: 1;
  width: 100%;
  padding: 20px;
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 0.85rem;
  line-height: 1.7;
  background: var(--bg);
  color: var(--text);
  border: none;
  resize: none;
  outline: none;
  tab-size: 2;
}

.editor::placeholder {
  color: var(--text-dim);
}

/* ─── Preview ─────────────────────────────── */

.preview-toggle {
  display: flex;
  gap: 2px;
  background: var(--bg-input);
  border-radius: var(--radius-sm);
  padding: 2px;
}

.toggle-btn {
  font-size: 0.7rem;
  font-weight: 500;
  font-family: var(--font);
  padding: 4px 12px;
  background: transparent;
  color: var(--text-dim);
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: all var(--transition);
}

.toggle-btn.active {
  background: var(--bg-card);
  color: var(--primary);
}

.preview {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  background: #FFFFFF;
}

.email-frame {
  max-width: 600px;
  margin: 0 auto;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: #333333;
}

.email-frame h1 { font-size: 28px; margin: 0 0 16px; color: #1a1a1a; }
.email-frame h2 { font-size: 22px; margin: 24px 0 12px; color: #1a1a1a; }
.email-frame h3 { font-size: 18px; margin: 20px 0 8px; color: #333333; }
.email-frame p { margin: 0 0 16px; }
.email-frame ul, .email-frame ol { margin: 0 0 16px; padding-left: 24px; }
.email-frame li { margin-bottom: 6px; }
.email-frame a { color: #10B981; text-decoration: underline; }
.email-frame blockquote {
  margin: 0 0 16px;
  padding: 12px 16px;
  border-left: 4px solid #10B981;
  background: #f0fdf4;
  color: #374151;
}
.email-frame code {
  background: #f1f5f9;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 14px;
  font-family: 'Courier New', Courier, monospace;
}
.email-frame pre {
  background: #1e293b;
  color: #e2e8f0;
  padding: 16px;
  border-radius: 8px;
  overflow-x: auto;
  margin: 0 0 16px;
}
.email-frame pre code {
  background: transparent;
  color: inherit;
  padding: 0;
}
.email-frame hr {
  border: none;
  border-top: 1px solid #e5e7eb;
  margin: 24px 0;
}
.email-frame table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 16px;
}
.email-frame th, .email-frame td {
  padding: 10px 14px;
  text-align: left;
  border: 1px solid #e5e7eb;
}
.email-frame th {
  background: #f8fafc;
  font-weight: 600;
  color: #1a1a1a;
}
.email-frame img { max-width: 100%; height: auto; border-radius: 8px; }
.email-frame strong { font-weight: 600; }
.email-frame em { font-style: italic; }

.source-view {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  background: var(--bg);
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 0.8rem;
  line-height: 1.7;
  color: var(--secondary);
  white-space: pre-wrap;
  word-break: break-all;
}

/* ─── Modal ───────────────────────────────── */

.modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(8px);
}

.modal-content {
  position: relative;
  width: 90%;
  max-width: 560px;
  max-height: 70vh;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

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

.modal-header h2 {
  font-size: 1rem;
  font-weight: 600;
}

.btn-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.4rem;
  cursor: pointer;
  padding: 4px;
  transition: color var(--transition);
}
.btn-close:hover { color: var(--text); }

.modal-body {
  padding: 16px 20px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.template-card {
  padding: 12px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
}

.template-card:hover {
  border-color: var(--primary);
  background: rgba(16, 185, 129, 0.05);
  transform: translateY(-1px);
}

.template-card h3 {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 4px;
}

.template-card p {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ─── Toast ───────────────────────────────── */

.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  padding: 10px 20px;
  background: var(--bg-card);
  border: 1px solid var(--primary);
  border-radius: var(--radius-sm);
  color: var(--primary);
  font-size: 0.8rem;
  font-weight: 500;
  box-shadow: var(--shadow);
  z-index: 200;
  animation: toast-in 0.3s ease;
}

@keyframes toast-in {
  from { opacity: 0; transform: translateX(-50%) translateY(10px); }
  to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

/* ─── Responsive ──────────────────────────── */

@media (max-width: 768px) {
  .main {
    grid-template-columns: 1fr;
    grid-template-rows: 1fr 1fr;
  }

  .header {
    flex-wrap: wrap;
    gap: 8px;
  }

  .header-right {
    width: 100%;
    justify-content: flex-end;
  }

  .toolbar {
    gap: 8px;
  }

  .toolbar-input {
    width: 140px;
  }

  .compatibility-badges {
    margin-left: 0;
  }
}

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