/* assets/css/main.css — Global styles, CSS variables, dark theme, typography. */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

/* ─── CSS Custom Properties ─────────────────────────────────────────────── */
:root {
  /* Colors — backgrounds */
  --bg-base:        #0a0b0f;
  --bg-surface:     #111218;
  --bg-elevated:    #16171f;
  --bg-overlay:     #1c1d27;
  --bg-muted:       #1e1f2b;

  /* Colors — brand */
  --color-primary:        #3b82f6;
  --color-primary-hover:  #2563eb;
  --color-primary-light:  #60a5fa;
  --color-indigo:         #6366f1;
  --color-cyan:           #06b6d4;

  /* Colors — semantic */
  --color-success:  #22c55e;
  --color-warning:  #f59e0b;
  --color-danger:   #ef4444;
  --color-info:     #06b6d4;

  /* Colors — text */
  --text-primary:   #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted:     #64748b;
  --text-disabled:  #475569;

  /* Colors — borders */
  --border-subtle:  rgba(255, 255, 255, 0.06);
  --border-muted:   rgba(255, 255, 255, 0.10);
  --border-default: rgba(255, 255, 255, 0.15);
  --border-strong:  rgba(255, 255, 255, 0.25);

  /* Glossy card border */
  --border-glossy:  linear-gradient(135deg, rgba(255,255,255,0.12) 0%, rgba(255,255,255,0.04) 100%);

  /* Typography */
  --font-sans:  'Inter', ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono:  ui-monospace, Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', monospace;

  --text-xs:   0.75rem;
  --text-sm:   0.875rem;
  --text-base: 1rem;
  --text-lg:   1.125rem;
  --text-xl:   1.25rem;
  --text-2xl:  1.5rem;
  --text-3xl:  1.875rem;
  --text-4xl:  2.25rem;

  --font-normal:   400;
  --font-medium:   500;
  --font-semibold: 600;
  --font-bold:     700;
  --font-extrabold: 800;

  --leading-tight:  1.25;
  --leading-snug:   1.375;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;

  /* Spacing */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;

  /* Border radius */
  --radius-sm:   0.25rem;
  --radius-md:   0.5rem;
  --radius-lg:   0.75rem;
  --radius-xl:   1rem;
  --radius-2xl:  1.25rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm:  0 1px 3px rgba(0, 0, 0, 0.4), 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md:  0 4px 12px rgba(0, 0, 0, 0.5), 0 2px 6px rgba(0, 0, 0, 0.3);
  --shadow-lg:  0 10px 30px rgba(0, 0, 0, 0.6), 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-xl:  0 20px 50px rgba(0, 0, 0, 0.7), 0 8px 20px rgba(0, 0, 0, 0.5);
  --shadow-glow-blue: 0 0 20px rgba(59, 130, 246, 0.35);
  --shadow-glow-cyan: 0 0 20px rgba(6, 182, 212, 0.35);

  /* Transitions */
  --duration-fast:   100ms;
  --duration-normal: 200ms;
  --duration-slow:   300ms;
  --duration-slower: 500ms;
  --ease-default:    cubic-bezier(0.4, 0, 0.2, 1);
  --ease-in:         cubic-bezier(0.4, 0, 1, 1);
  --ease-out:        cubic-bezier(0, 0, 0.2, 1);
  --ease-bounce:     cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Layout */
  --sidebar-width:        240px;
  --sidebar-width-collapsed: 64px;
  --topbar-height:        60px;
  --content-max-width:    1400px;

  /* Z-index scale */
  --z-base:    0;
  --z-above:   10;
  --z-dropdown: 100;
  --z-sticky:  200;
  --z-sidebar: 300;
  --z-overlay: 400;
  --z-modal:   500;
  --z-toast:   600;
  --z-loading: 700;
}

/* ─── Light Mode ─────────────────────────────────────────────────────────── */
[data-theme="light"] {
  /* Backgrounds */
  --bg-base:     #f0f4f8;
  --bg-surface:  #ffffff;
  --bg-elevated: #ffffff;
  --bg-overlay:  #f1f5f9;
  --bg-muted:    #e2e8f0;

  /* Text */
  --text-primary:   #0f172a;
  --text-secondary: #475569;
  --text-muted:     #94a3b8;
  --text-disabled:  #cbd5e1;

  /* Borders */
  --border-subtle:  rgba(0, 0, 0, 0.06);
  --border-muted:   rgba(0, 0, 0, 0.10);
  --border-default: rgba(0, 0, 0, 0.18);
  --border-strong:  rgba(0, 0, 0, 0.30);

  --border-glossy: linear-gradient(135deg, rgba(0,0,0,0.06) 0%, rgba(0,0,0,0.02) 100%);

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.10), 0 2px 6px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 30px rgba(0,0,0,0.12), 0 4px 12px rgba(0,0,0,0.08);
  --shadow-xl: 0 20px 50px rgba(0,0,0,0.15), 0 8px 20px rgba(0,0,0,0.10);
}

/* Smooth theme transitions — limited to layout & interactive elements only */
.sidebar, .topbar, .main-content, .card, .modal, .btn, .form-input,
.form-control, .form-select, .form-textarea, .sidebar-nav-item,
.auth-card, .badge, .alert, body {
  transition-property: background-color, border-color, color, box-shadow;
  transition-duration: 200ms;
  transition-timing-function: ease;
}

/* Respect reduced-motion preference */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; }
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  font-weight: var(--font-normal);
  line-height: var(--leading-normal);
  color: var(--text-primary);
  background-color: var(--bg-base);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
}

/* ─── Typography ─────────────────────────────────────────────────────────── */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-semibold);
  line-height: var(--leading-tight);
  color: var(--text-primary);
}

h1 { font-size: var(--text-3xl); }
h2 { font-size: var(--text-2xl); }
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-lg); }
h5 { font-size: var(--text-base); }
h6 { font-size: var(--text-sm); }

p {
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-default);
}

a:hover {
  color: var(--color-primary-light);
}

code, kbd, samp, pre {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
}

code {
  background: var(--bg-muted);
  color: var(--color-cyan);
  padding: 0.1em 0.35em;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
}

pre {
  background: var(--bg-muted);
  color: var(--text-primary);
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  overflow-x: auto;
  line-height: var(--leading-relaxed);
}

pre code {
  background: none;
  border: none;
  padding: 0;
  color: inherit;
}

/* SMTP credential monospace */
.mono, .credential {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.02em;
}

/* ─── Selection ──────────────────────────────────────────────────────────── */
::selection {
  background: rgba(59, 130, 246, 0.35);
  color: var(--text-primary);
}

/* ─── Scrollbar ──────────────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg-base); }
::-webkit-scrollbar-thumb {
  background: var(--bg-overlay);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover { background: var(--bg-muted); }

/* ─── Focus ring ─────────────────────────────────────────────────────────── */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ─── Utility: screen-reader only ────────────────────────────────────────── */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* ─── Utility: truncate ──────────────────────────────────────────────────── */
.truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ─── Loading overlay ────────────────────────────────────────────────────── */
#loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(10, 11, 15, 0.85);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-loading);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--duration-normal) var(--ease-default);
}

#loading-overlay.active {
  opacity: 1;
  pointer-events: all;
}

#loading-overlay .spinner {
  width: 44px;
  height: 44px;
  border: 3px solid var(--border-subtle);
  border-top-color: var(--color-primary);
  border-radius: var(--radius-full);
  animation: spin 0.75s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ─── Mobile sidebar overlay ─────────────────────────────────────────────── */
#sidebar-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(2px);
  z-index: calc(var(--z-sidebar) - 1);
  display: none;
}

#sidebar-overlay.active {
  display: block;
}