/* ============================================================
   Free Worksheet Generator — Shared Styles
   ============================================================ */

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

:root {
  --primary: #3d5af1;
  --primary-dark: #2c41c4;
  --accent: #f72585;
  --bg: #f0f2ff;
  --card-bg: #ffffff;
  --text: #1a1a2e;
  --muted: #6b7280;
  --border: #e2e4ef;
  --success: #10b981;
  --radius: 12px;
  --shadow: 0 4px 20px rgba(61,90,241,0.10);
}

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

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

/* ---- Site Header ---- */
.site-header {
  background: var(--primary);
  color: #fff;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}
.site-header .logo {
  font-size: 1.2rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: #fff;
}
.site-header nav {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-left: auto;
}
.site-header nav a {
  color: rgba(255,255,255,0.85);
  font-size: 0.875rem;
  font-weight: 500;
  transition: color 0.2s;
}
.site-header nav a:hover { color: #fff; text-decoration: none; }

/* ---- Hero (Homepage only) ---- */
.hero {
  background: linear-gradient(135deg, var(--primary) 0%, #7c3aed 100%);
  color: #fff;
  text-align: center;
  padding: 56px 24px 48px;
}
.hero h1 { font-size: clamp(1.8rem, 5vw, 2.8rem); font-weight: 800; margin-bottom: 12px; }
.hero p { font-size: 1.1rem; opacity: 0.9; max-width: 520px; margin: 0 auto 32px; }
.hero-badges { display: flex; justify-content: center; gap: 12px; flex-wrap: wrap; margin-bottom: 32px; }
.badge {
  background: rgba(255,255,255,0.18);
  border: 1px solid rgba(255,255,255,0.3);
  padding: 4px 14px;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
}

/* ---- Container ---- */
.container { max-width: 1000px; margin: 0 auto; padding: 32px 16px; }
.container-narrow { max-width: 680px; margin: 0 auto; padding: 32px 16px; }

/* ---- Tool Grid (Homepage) ---- */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 20px;
  margin: 32px 0;
}
.tool-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 24px 16px;
  text-align: center;
  text-decoration: none;
  color: var(--text);
  box-shadow: var(--shadow);
  transition: transform 0.2s, box-shadow 0.2s;
  border: 1px solid var(--border);
}
.tool-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(61,90,241,0.18);
  text-decoration: none;
}
.tool-card .icon { font-size: 2.5rem; margin-bottom: 12px; }
.tool-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 6px; }
.tool-card p { font-size: 0.8rem; color: var(--muted); }

/* ---- Generator Page Layout ---- */
.page-header {
  background: #fff;
  border-bottom: 1px solid var(--border);
  padding: 24px 16px;
  text-align: center;
}
.page-header h1 { font-size: clamp(1.4rem, 4vw, 2rem); font-weight: 800; margin-bottom: 8px; }
.page-header p { color: var(--muted); max-width: 500px; margin: 0 auto; }

/* ---- Card ---- */
.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  margin-bottom: 20px;
}
.card h2 { font-size: 1.05rem; font-weight: 700; margin-bottom: 16px; color: var(--primary-dark); }

/* ---- Fact reference table (pSEO number-fact pages) ---- */
.fact-table { width: 100%; border-collapse: collapse; font-size: 0.85rem; margin-top: 8px; }
.fact-table td { padding: 6px 10px; border-bottom: 1px solid var(--border); }
.fact-table td:first-child { color: var(--muted); }
.fact-table td:last-child { font-weight: 600; color: var(--text); }

/* ---- Controls ---- */
.controls-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 20px;
}
.control-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--muted);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.control-group select,
.control-group input[type="number"],
.control-group input[type="range"] {
  width: 100%;
  padding: 8px 12px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  font-size: 0.95rem;
  background: #fff;
  color: var(--text);
  transition: border-color 0.2s;
}
.control-group select:focus,
.control-group input:focus {
  border-color: var(--primary);
}
.control-group .range-value {
  text-align: right;
  font-size: 0.85rem;
  color: var(--primary);
  font-weight: 700;
  margin-top: 4px;
}

/* ---- Buttons ---- */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 10px;
  padding: 12px 28px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
  text-decoration: none;
}
.btn-primary:hover { background: var(--primary-dark); text-decoration: none; color: #fff; }
.btn-primary:active { transform: scale(0.97); }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  color: var(--primary);
  border: 1.5px solid var(--primary);
  border-radius: 10px;
  padding: 10px 22px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}
.btn-secondary:hover { background: var(--primary); color: #fff; text-decoration: none; }

.btn-group { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }

/* ---- Preview Area ---- */
.preview-area {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 200px;
  padding: 16px;
}
.preview-area canvas { max-width: 100%; border-radius: 8px; border: 1px solid var(--border); }

/* ---- Ad Placeholder ---- */
.ad-slot {
  width: 100%;
  background: #f8f9ff;
  border: 2px dashed #c7d2fe;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #a5b4fc;
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-align: center;
  margin: 12px 0;
}
.ad-slot-leaderboard { height: 90px; }
.ad-slot-rect { height: 250px; }

/* ---- Product Banner ---- */
.product-banner {
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
  color: #fff;
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  margin: 24px 0;
}
.product-banner h3 { font-size: 1.1rem; font-weight: 800; margin-bottom: 4px; }
.product-banner p { font-size: 0.875rem; opacity: 0.8; }
.btn-gold {
  background: linear-gradient(135deg, #f6d365 0%, #fda085 100%);
  color: #1a1a2e;
  border: none;
  border-radius: 10px;
  padding: 12px 24px;
  font-size: 0.95rem;
  font-weight: 800;
  cursor: pointer;
  white-space: nowrap;
  text-decoration: none;
  display: inline-block;
  transition: opacity 0.2s, transform 0.1s;
}
.btn-gold:hover { opacity: 0.92; text-decoration: none; color: #1a1a2e; }
.btn-gold:active { transform: scale(0.97); }

/* ---- Features list ---- */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
  margin: 24px 0;
}
.feature-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px;
  background: var(--card-bg);
  border-radius: 10px;
  border: 1px solid var(--border);
}
.feature-item .icon { font-size: 1.4rem; flex-shrink: 0; }
.feature-item h4 { font-size: 0.9rem; font-weight: 700; margin-bottom: 2px; }
.feature-item p { font-size: 0.8rem; color: var(--muted); }

/* ---- Related tools ---- */
.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 12px;
  margin-top: 12px;
}
.related-card {
  display: block;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px;
  text-align: center;
  text-decoration: none;
  color: var(--text);
  transition: background 0.2s;
  font-size: 0.85rem;
  font-weight: 600;
}
.related-card:hover { background: #e0e4ff; text-decoration: none; }
.related-card .icon { display: block; font-size: 1.6rem; margin-bottom: 6px; }

/* ---- Footer ---- */
.site-footer {
  background: #1a1a2e;
  color: rgba(255,255,255,0.7);
  text-align: center;
  padding: 24px 16px;
  font-size: 0.85rem;
  margin-top: 40px;
}
.site-footer a { color: rgba(255,255,255,0.85); }
.site-footer a:hover { color: #fff; }

/* ---- Utility ---- */
.text-center { text-align: center; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mb-8 { margin-bottom: 8px; }
.tag { display: inline-block; background: #e0e7ff; color: var(--primary-dark); border-radius: 6px; padding: 2px 10px; font-size: 0.78rem; font-weight: 600; }

/* ---- Math table ---- */
.math-problems-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 1.1rem;
}
.math-problems-table td {
  padding: 6px 8px;
  vertical-align: middle;
}
.math-num { font-size: 0.8rem; color: var(--muted); }
.math-answer-blank {
  display: inline-block;
  border-bottom: 2px solid #333;
  width: 48px;
  height: 28px;
}

/* ---- Responsive ---- */
@media (max-width: 600px) {
  .site-header { padding: 10px 14px; }
  .hero { padding: 36px 16px 28px; }
  .container, .container-narrow { padding: 20px 12px; }
  .product-banner { flex-direction: column; align-items: flex-start; }
}

/* ============================================================
   W-2 ADDITIONS: dark mode / focus-visible / 44px taps
   ============================================================ */

/* 1. DARK MODE (prefers-color-scheme) */
@media (prefers-color-scheme: dark) {
  :root {
    --bg:      #0f1117;
    --card-bg: #1a1d27;
    --text:    #e8eaf0;
    --muted:   #8fa0bc;
    --border:  #2a3047;
    --shadow:  0 2px 12px rgba(0,0,0,0.4);
  }
  /* card / white surface overrides */
  .card, .card-bg, .white-bg { background: #1a1d27 !important; }
  /* ad placeholder dark */
  .ad-placeholder { background:#1a1d27; border-color:#2a3047; }
  /* form controls */
  select, input, textarea {
    background: #1e2233;
    color: var(--text);
    border-color: var(--border);
    color-scheme: dark;
  }
}

/* 2. FOCUS-VISIBLE (keyboard accessibility, WCAG 2.1 SC 2.4.7) */
/* Reset — pointer users see no ring; keyboard users see ring below */
a:focus, button:focus, input:focus, select:focus,
textarea:focus, [tabindex]:focus { outline: none; }
/* Keyboard ring */
a:focus-visible, button:focus-visible, input:focus-visible,
select:focus-visible, textarea:focus-visible, [tabindex]:focus-visible {
  outline: 3px solid var(--primary, #3d5af1);
  outline-offset: 3px;
  border-radius: 4px;
}

/* 3. 44px MINIMUM TAP TARGETS (WCAG 2.5.5) */
.site-header nav a,
.nav-links a {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}
button,
.btn-primary,
.btn-secondary,
[role="button"] {
  min-height: 44px;
}
.site-footer a,
footer a {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding-top: 4px;
  padding-bottom: 4px;
}
.tap-target {
  min-height: 44px;
  min-width: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* E-37: Language switcher */
.lang-switch {
  font-size: 0.78rem;
  padding: 3px 8px;
  border: 1px solid var(--border, #ddd);
  border-radius: 4px;
  color: var(--muted, #666);
  text-decoration: none;
  white-space: nowrap;
}
.lang-switch:hover { background: var(--bg-alt, #f5f5f5); }