/* Lexchk — Design System
   Material 3 tokens matching Android design spec
   Primary: #1E3A8A (deep blue)  Secondary: #22C55E (green) */

/* ── CSS Custom Properties (Light Mode) ─────────────────────────────────── */
:root {
  --primary: #1E3A8A;
  --primary-container: #DBEAFE;
  --secondary: #22C55E;
  --secondary-container: #DCFCE7;
  --background: #F8FAFC;
  --surface: #FFFFFF;
  --surface-variant: #F1F5F9;
  --on-primary: #FFFFFF;
  --on-secondary: #FFFFFF;
  --on-background: #0F172A;
  --on-surface: #0F172A;
  --muted: #64748B;
  --error: #DC2626;
  --warning: #F59E0B;
  --success: #16A34A;

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #1E3A8A, #3B82F6);

  /* Corners (matching Android shape system) */
  --corner-large: 24px;
  --corner-medium: 16px;
  --corner-small: 12px;
  --corner-card: 20px;

  /* Spacing (8dp base) */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;

  /* Typography */
  --font-primary: 'Inter', 'Roboto', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,.1);
  --shadow-lg: 0 8px 24px rgba(0,0,0,.12);
}

/* ── Dark Mode ──────────────────────────────────────────────────────────── */
@media (prefers-color-scheme: dark) {
  :root {
    --primary: #3B82F6;
    --primary-container: #1E3A8A;
    --secondary: #22C55E;
    --secondary-container: #14532D;
    --background: #020617;
    --surface: #0F172A;
    --surface-variant: #1E293B;
    --on-primary: #FFFFFF;
    --on-secondary: #FFFFFF;
    --on-background: #F8FAFC;
    --on-surface: #F8FAFC;
    --muted: #94A3B8;
    --error: #F87171;
    --warning: #FBBF24;
    --success: #4ADE80;

    --gradient-primary: linear-gradient(135deg, #1E3A8A, #3B82F6);
    --shadow-sm: 0 1px 3px rgba(0,0,0,.3);
    --shadow-md: 0 4px 12px rgba(0,0,0,.4);
    --shadow-lg: 0 8px 24px rgba(0,0,0,.5);
  }
}

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

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

body {
  font-family: var(--font-primary);
  background: var(--background);
  color: var(--on-background);
  line-height: 1.5;
  min-height: 100vh;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Typography ─────────────────────────────────────────────────────────── */
.text-title { font-size: 28px; font-weight: 700; line-height: 1.2; }
.text-headline { font-size: 22px; font-weight: 600; line-height: 1.3; }
.text-subtitle { font-size: 16px; color: var(--muted); }
.text-body { font-size: 16px; }
.text-small { font-size: 14px; }
.text-muted { color: var(--muted); }
.text-center { text-align: center; }

/* ── Layout ─────────────────────────────────────────────────────────────── */
.container {
  max-width: 640px;
  margin: 0 auto;
  padding: var(--space-lg);
}

.container-wide {
  max-width: 960px;
  margin: 0 auto;
  padding: var(--space-lg);
}

.stack { display: flex; flex-direction: column; }
.stack-sm { gap: var(--space-sm); }
.stack-md { gap: var(--space-md); }
.stack-lg { gap: var(--space-lg); }
.stack-xl { gap: var(--space-xl); }

.row { display: flex; align-items: center; gap: var(--space-md); }
.row-between { justify-content: space-between; }

/* ── Card ───────────────────────────────────────────────────────────────── */
.card {
  background: var(--surface);
  border: 1px solid var(--surface-variant);
  border-radius: var(--corner-card);
  padding: var(--space-lg);
  box-shadow: var(--shadow-sm);
}

.card-elevated {
  box-shadow: var(--shadow-md);
  border: none;
}

/* ── Buttons ────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  height: 56px;
  padding: 0 var(--space-lg);
  border: none;
  border-radius: var(--corner-medium);
  font-family: var(--font-primary);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all .15s ease;
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-primary);
  color: var(--on-primary);
}
.btn-primary:hover { opacity: .9; transform: translateY(-1px); }

.btn-secondary {
  background: var(--secondary);
  color: var(--on-secondary);
}
.btn-secondary:hover { opacity: .9; }

.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
}
.btn-outline:hover { background: var(--primary-container); }

.btn-text {
  background: transparent;
  color: var(--primary);
  height: auto;
  padding: var(--space-sm) var(--space-md);
}

.btn-full { width: 100%; }

.btn:disabled {
  opacity: .5;
  cursor: not-allowed;
  transform: none;
}

/* ── Inputs ─────────────────────────────────────────────────────────────── */
.input-group { display: flex; flex-direction: column; gap: 6px; }
.input-group label { font-size: 14px; font-weight: 500; color: var(--muted); }

.input {
  height: 48px;
  padding: 0 var(--space-md);
  border: 1px solid var(--surface-variant);
  border-radius: var(--corner-small);
  background: var(--surface);
  color: var(--on-surface);
  font-family: var(--font-primary);
  font-size: 16px;
  transition: border-color .15s;
}
.input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-container); }

.textarea {
  min-height: 220px;
  padding: var(--space-md);
  border: 1px solid var(--surface-variant);
  border-radius: var(--corner-small);
  background: var(--surface);
  color: var(--on-surface);
  font-family: var(--font-primary);
  font-size: 16px;
  resize: vertical;
  transition: border-color .15s;
}
.textarea:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-container); }
.textarea::placeholder { color: var(--muted); }

/* ── Badges ─────────────────────────────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .5px;
}
.badge-critical { background: #FEE2E2; color: #991B1B; }
.badge-high { background: #FEF3C7; color: #92400E; }
.badge-medium { background: #DBEAFE; color: #1E3A8A; }
.badge-low { background: #DCFCE7; color: #166534; }
.badge-clear { background: var(--secondary-container); color: #166534; }

@media (prefers-color-scheme: dark) {
  .badge-critical { background: #7F1D1D; color: #FCA5A5; }
  .badge-high { background: #78350F; color: #FDE68A; }
  .badge-medium { background: #1E3A8A; color: #93C5FD; }
  .badge-low { background: #14532D; color: #86EFAC; }
  .badge-clear { background: #14532D; color: #86EFAC; }
}

/* ── Nav ────────────────────────────────────────────────────────────────── */
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  background: var(--surface);
  border-bottom: 1px solid var(--surface-variant);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 20px;
  font-weight: 700;
  color: var(--on-surface);
  text-decoration: none;
}

.nav-logo img { height: 32px; }

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--muted);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--corner-small);
  transition: color .15s, background .15s;
}
.nav-links a:hover { color: var(--on-surface); background: var(--surface-variant); text-decoration: none; }
.nav-links a.active { color: var(--primary); }

/* ── Bottom Sheet (Paywall) ─────────────────────────────────────────────── */
.sheet-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.5);
  z-index: 1000;
  display: none;
  align-items: flex-end;
  justify-content: center;
}
.sheet-overlay.active { display: flex; }

.sheet {
  background: var(--surface);
  border-radius: var(--corner-large) var(--corner-large) 0 0;
  padding: var(--space-xl) var(--space-lg) var(--space-lg);
  width: 100%;
  max-width: 480px;
  max-height: 80vh;
  overflow-y: auto;
  animation: slideUp .3s ease;
}

@keyframes slideUp {
  from { transform: translateY(100%); }
  to { transform: translateY(0); }
}

.sheet-handle {
  width: 40px;
  height: 4px;
  background: var(--surface-variant);
  border-radius: 2px;
  margin: 0 auto var(--space-lg);
}

/* ── Progress / Loading ─────────────────────────────────────────────────── */
.progress-ring {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-lg);
  padding: var(--space-2xl);
}

.spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--surface-variant);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin .8s linear infinite;
}

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

/* ── Issue Card ─────────────────────────────────────────────────────────── */
.issue-card {
  background: var(--surface);
  border: 1px solid var(--surface-variant);
  border-radius: var(--corner-card);
  padding: var(--space-md) var(--space-lg);
}

.issue-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-sm);
}

.issue-card-title {
  font-size: 16px;
  font-weight: 600;
}

.issue-card-body {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.6;
}

.issue-card-suggestion {
  margin-top: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--primary-container);
  border-radius: var(--corner-small);
  font-size: 13px;
}

/* ── Recent Check Item ──────────────────────────────────────────────────── */
.recent-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md);
  background: var(--surface);
  border: 1px solid var(--surface-variant);
  border-radius: var(--corner-medium);
  cursor: pointer;
  transition: box-shadow .15s;
}
.recent-item:hover { box-shadow: var(--shadow-md); }

.recent-item-info { display: flex; flex-direction: column; gap: 2px; }
.recent-item-name { font-weight: 600; font-size: 15px; }
.recent-item-time { font-size: 13px; color: var(--muted); }

/* ── SSO Buttons ────────────────────────────────────────────────────────── */
.btn-sso {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  height: 48px;
  width: 100%;
  padding: 0 var(--space-md);
  border: 1px solid var(--surface-variant);
  border-radius: var(--corner-small);
  background: var(--surface);
  color: var(--on-surface);
  font-family: var(--font-primary);
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  transition: background .15s;
}
.btn-sso:hover { background: var(--surface-variant); }
.btn-sso svg { width: 20px; height: 20px; }

/* ── Toast ──────────────────────────────────────────────────────────────── */
.toast-wrap {
  position: fixed;
  top: var(--space-lg);
  right: var(--space-lg);
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.toast {
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--corner-small);
  font-size: 14px;
  font-weight: 500;
  animation: fadeIn .2s ease;
  max-width: 360px;
}
.toast-success { background: var(--secondary-container); color: #166534; }
.toast-error { background: #FEE2E2; color: #991B1B; }
.toast-info { background: var(--primary-container); color: #1E3A8A; }

@keyframes fadeIn { from { opacity: 0; transform: translateY(-8px); } to { opacity: 1; } }

/* ── Divider ────────────────────────────────────────────────────────────── */
.divider {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  color: var(--muted);
  font-size: 13px;
}
.divider::before, .divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--surface-variant);
}

/* ── Responsive ─────────────────────────────────────────────────────────── */
@media (max-width: 640px) {
  .container, .container-wide { padding: var(--space-md); }
  .nav { padding: var(--space-sm) var(--space-md); }
  .nav-links a { font-size: 13px; padding: var(--space-xs) var(--space-sm); }
  .text-title { font-size: 24px; }
  .btn { height: 48px; font-size: 15px; }
  .sheet { padding: var(--space-lg) var(--space-md) var(--space-md); }
}

/* ── Utility ────────────────────────────────────────────────────────────── */
.hidden { display: none !important; }
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }