/* ==========================================================================
   TempMail — Main Design System & Themes
   Modern, sleek, privacy-focused temporary email web application
   ========================================================================== */

:root {
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Helvetica Neue', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Cascadia Code', 'Fira Code', 'Courier New', monospace;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.15), 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.25), 0 4px 8px rgba(0, 0, 0, 0.12);
  --shadow-glow: 0 0 24px rgba(99, 102, 241, 0.25);
  --transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Dark Theme (Default) */
[data-theme="dark"] {
  --bg-app: #0b0f19;
  --bg-surface: #111827;
  --bg-surface-elevated: #1e293b;
  --bg-surface-hover: #26334d;
  --bg-subtle: #0f172a;
  --border-color: #1e293b;
  --border-color-hover: #334155;
  --border-color-focus: #6366f1;

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-accent: #818cf8;

  --accent-primary: #6366f1;
  --accent-primary-hover: #4f46e5;
  --accent-secondary: #3b82f6;
  --accent-gradient: linear-gradient(135deg, #6366f1 0%, #3b82f6 100%);
  --accent-glow: rgba(99, 102, 241, 0.35);

  --color-success: #10b981;
  --color-success-bg: rgba(16, 185, 129, 0.12);
  --color-warning: #f59e0b;
  --color-warning-bg: rgba(245, 158, 11, 0.12);
  --color-danger: #ef4444;
  --color-danger-bg: rgba(239, 68, 68, 0.12);
  --color-info: #0ea5e9;
  --color-info-bg: rgba(14, 165, 233, 0.12);

  --card-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.4), 0 8px 10px -6px rgba(0, 0, 0, 0.3);
}

/* Light Theme */
[data-theme="light"] {
  --bg-app: #f1f5f9;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #f8fafc;
  --bg-surface-hover: #e2e8f0;
  --bg-subtle: #f8fafc;
  --border-color: #e2e8f0;
  --border-color-hover: #cbd5e1;
  --border-color-focus: #4f46e5;

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --text-accent: #4f46e5;

  --accent-primary: #4f46e5;
  --accent-primary-hover: #4338ca;
  --accent-secondary: #2563eb;
  --accent-gradient: linear-gradient(135deg, #4f46e5 0%, #2563eb 100%);
  --accent-glow: rgba(79, 70, 229, 0.2);

  --color-success: #059669;
  --color-success-bg: #ecfdf5;
  --color-warning: #d97706;
  --color-warning-bg: #fffbeb;
  --color-danger: #dc2626;
  --color-danger-bg: #fef2f2;
  --color-info: #0284c7;
  --color-info-bg: #f0f9ff;

  --card-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.06), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
}

/* OLED Midnight Black Theme */
[data-theme="oled"] {
  --bg-app: #000000;
  --bg-surface: #0a0a0a;
  --bg-surface-elevated: #141414;
  --bg-surface-hover: #1f1f1f;
  --bg-subtle: #050505;
  --border-color: #1a1a1a;
  --border-color-hover: #2c2c2c;
  --border-color-focus: #3b82f6;

  --text-primary: #ffffff;
  --text-secondary: #a3a3a3;
  --text-muted: #666666;
  --text-accent: #60a5fa;

  --accent-primary: #2563eb;
  --accent-primary-hover: #1d4ed8;
  --accent-secondary: #3b82f6;
  --accent-gradient: linear-gradient(135deg, #1d4ed8 0%, #3b82f6 100%);
  --accent-glow: rgba(37, 99, 235, 0.4);

  --color-success: #10b981;
  --color-success-bg: rgba(16, 185, 129, 0.15);
  --color-warning: #f59e0b;
  --color-warning-bg: rgba(245, 158, 11, 0.15);
  --color-danger: #ef4444;
  --color-danger-bg: rgba(239, 68, 68, 0.15);
  --color-info: #38bdf8;
  --color-info-bg: rgba(56, 189, 248, 0.15);

  --card-shadow: 0 10px 30px rgba(0, 0, 0, 0.8);
}

/* Cyberpunk Neon Theme */
[data-theme="cyberpunk"] {
  --bg-app: #0d0614;
  --bg-surface: #170d24;
  --bg-surface-elevated: #24143a;
  --bg-surface-hover: #321c50;
  --bg-subtle: #12091d;
  --border-color: #3b1e60;
  --border-color-hover: #5b2e94;
  --border-color-focus: #ec4899;

  --text-primary: #fdf2f8;
  --text-secondary: #f472b6;
  --text-muted: #a855f7;
  --text-accent: #06b6d4;

  --accent-primary: #ec4899;
  --accent-primary-hover: #db2777;
  --accent-secondary: #8b5cf6;
  --accent-gradient: linear-gradient(135deg, #ec4899 0%, #8b5cf6 50%, #06b6d4 100%);
  --accent-glow: rgba(236, 72, 153, 0.45);

  --color-success: #10b981;
  --color-success-bg: rgba(16, 185, 129, 0.2);
  --color-warning: #fbbf24;
  --color-warning-bg: rgba(251, 191, 36, 0.2);
  --color-danger: #f43f5e;
  --color-danger-bg: rgba(244, 63, 94, 0.2);
  --color-info: #06b6d4;
  --color-info-bg: rgba(6, 182, 212, 0.2);

  --card-shadow: 0 10px 25px rgba(236, 72, 153, 0.25);
}

/* Reset & Layout */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  height: 100%;
  font-family: var(--font-sans);
  background-color: var(--bg-app);
  color: var(--text-primary);
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

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

.app-header {
  height: 64px;
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  z-index: 20;
  flex-shrink: 0;
}

.brand-section {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: inherit;
}

.brand-logo {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 2px 8px var(--accent-glow);
}

.brand-info {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: flex;
  align-items: center;
  gap: 6px;
}

.badge-live {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  background: var(--color-success-bg);
  color: var(--color-success);
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid var(--color-success);
  -webkit-text-fill-color: var(--color-success);
}

.brand-subtitle {
  font-size: 11px;
  color: var(--text-muted);
  font-weight: 500;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.icon-btn {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
}

.icon-btn:hover {
  background: var(--bg-surface-elevated);
  color: var(--text-primary);
  border-color: var(--border-color-hover);
}

.icon-btn.muted {
  color: var(--text-muted);
  opacity: 0.6;
}

.btn-header-action {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-size: 13px;
  font-weight: 600;
  padding: 8px 14px;
  border-radius: var(--radius-md);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: var(--transition);
}

.btn-header-action:hover {
  background: var(--bg-surface-hover);
  border-color: var(--border-color-hover);
}

.btn-header-action.btn-accent {
  background: var(--accent-gradient);
  color: #ffffff;
  border: none;
  box-shadow: 0 2px 10px var(--accent-glow);
}

.btn-header-action.btn-accent:hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
}

.main-layout {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.address-hero {
  background: var(--bg-subtle);
  border-bottom: 1px solid var(--border-color);
  padding: 20px 24px;
  flex-shrink: 0;
}

.address-hero-container {
  max-width: 1000px;
  margin: 0 auto;
}

.workspace-container {
  flex: 1;
  display: flex;
  overflow: hidden;
  position: relative;
}

.inbox-column {
  width: 380px;
  border-right: 1px solid var(--border-color);
  background-color: var(--bg-surface);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  overflow: hidden;
}

.viewer-column {
  flex: 1;
  background-color: var(--bg-app);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  position: relative;
}