/* ================================
   DateCalc4Me — Main Stylesheet
   Bright, friendly, accessible
   ================================ */

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

:root {
  --ink:        #1e293b;
  --ink-soft:   #475569;
  --ink-mute:   #94a3b8;
  --bg:         #f0f7ff;
  --white:      #ffffff;
  --primary:    #2563eb;
  --primary-lt: #eff6ff;
  --primary-dk: #1d4ed8;
  --accent:     #f59e0b;
  --accent-lt:  #fffbeb;
  --green:      #10b981;
  --green-lt:   #ecfdf5;
  --purple:     #8b5cf6;
  --purple-lt:  #f5f3ff;
  --rose:       #f43f5e;
  --rose-lt:    #fff1f2;
  --border:     #e2e8f0;
  --border-md:  #cbd5e1;
  --shadow-sm:  0 1px 3px rgba(30,41,59,0.08);
  --shadow-md:  0 4px 16px rgba(30,41,59,0.10);
  --shadow-lg:  0 12px 40px rgba(30,41,59,0.13);
  --radius:     14px;
  --radius-sm:  9px;
  --font-display: 'DM Serif Display', Georgia, serif;
  --font-body:    'DM Sans', system-ui, sans-serif;
}

html { scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  font-size: 16px;
}
.container { max-width: 1100px; margin: 0 auto; padding: 0 24px; }

/* ---- Header ---- */
.site-header {
  background: var(--white);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 200;
  box-shadow: var(--shadow-sm);
}
.hdr-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.logo { display: flex; align-items: center; gap: 9px; text-decoration: none; }
.logo-icon { font-size: 24px; }
.logo-text {
  font-family: var(--font-display);
  font-size: 22px; color: var(--primary);
  letter-spacing: -0.5px;
}
.site-nav { display: flex; gap: 24px; }
.site-nav a {
  text-decoration: none; color: var(--ink-soft);
  font-size: 14px; font-weight: 500; transition: color 0.15s;
}
.site-nav a:hover { color: var(--primary); }
.mob-menu-btn {
  display: none; background: none; border: 1px solid var(--border);
  border-radius: 8px; padding: 6px 10px; font-size: 18px; cursor: pointer; color: var(--ink-soft);
}

/* ---- Hero (bright) ---- */
.hero {
  background: linear-gradient(135deg, #dbeafe 0%, #eff6ff 40%, #fef3c7 100%);
  padding: 56px 0 0;
  position: relative; overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse 55% 60% at 85% 40%, rgba(37,99,235,0.10) 0%, transparent 70%),
    radial-gradient(ellipse 40% 50% at 15% 80%, rgba(245,158,11,0.12) 0%, transparent 70%);
  pointer-events: none;
}
.hero-inner {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 48px; align-items: center; position: relative; z-index: 1;
}
.hero-text { padding-bottom: 60px; }
.hero-text h1 {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 5vw, 3.6rem);
  line-height: 1.1; color: var(--ink); margin-bottom: 16px;
}
.hero-text h1 em { font-style: italic; color: var(--primary); }
.hero-sub { font-size: 17px; color: var(--ink-soft); max-width: 380px; line-height: 1.65; }
.hero-badges { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 20px; }
.badge {
  display: inline-flex; align-items: center; gap: 5px;
  background: var(--white); border: 1px solid var(--border);
  border-radius: 20px; padding: 5px 12px; font-size: 13px;
  color: var(--ink-soft); font-weight: 500;
  box-shadow: var(--shadow-sm);
}

/* ---- Calculator Card ---- */
.calc-card {
  background: var(--white);
  border-radius: var(--radius) var(--radius) 0 0;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border); border-bottom: none;
  overflow: hidden;
}
.calc-body { padding: 28px; }

.date-row {
  display: flex; align-items: flex-end; gap: 12px; margin-bottom: 16px;
}
.field-group { flex: 1; }
.field-group label {
  display: block; font-size: 11px; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.09em;
  color: var(--ink-mute); margin-bottom: 6px;
}
.field-group input[type="date"],
.field-group input[type="text"],
.field-group input[type="email"],
.field-group input[type="number"],
.field-group textarea,
.field-group select {
  width: 100%; padding: 12px 14px;
  border: 1.5px solid var(--border); border-radius: var(--radius-sm);
  font-family: var(--font-body); font-size: 15px; color: var(--ink);
  background: var(--white); transition: border-color 0.15s, box-shadow 0.15s;
}
.field-group input:focus, .field-group textarea:focus, .field-group select:focus {
  outline: none; border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.12);
}
.arrow-divider {
  font-size: 20px; color: var(--primary); padding-bottom: 10px; flex-shrink: 0;
}
.options-row {
  display: flex; gap: 20px; margin-bottom: 20px; flex-wrap: wrap;
}
.checkbox-label {
  display: flex; align-items: center; gap: 8px;
  font-size: 14px; color: var(--ink-soft); cursor: pointer;
}
.checkbox-label input[type="checkbox"] {
  width: 16px; height: 16px; accent-color: var(--primary); cursor: pointer;
}
.calc-btn {
  width: 100%; padding: 15px;
  background: var(--primary); color: var(--white);
  border: none; border-radius: var(--radius-sm);
  font-family: var(--font-body); font-size: 16px; font-weight: 600;
  cursor: pointer; transition: background 0.15s, transform 0.1s, box-shadow 0.15s;
  box-shadow: 0 2px 8px rgba(37,99,235,0.25);
}
.calc-btn:hover { background: var(--primary-dk); box-shadow: 0 4px 14px rgba(37,99,235,0.35); }
.calc-btn:active { transform: scale(0.99); }

/* ---- Results ---- */
.results-panel {
  border-top: 1px solid var(--border); padding: 24px 28px 28px;
  background: var(--primary-lt);
  animation: fadeUp 0.3s ease;
}
@keyframes fadeUp { from { opacity:0; transform:translateY(8px); } to { opacity:1; transform:translateY(0); } }

.results-grid {
  display: grid; grid-template-columns: repeat(4,1fr); gap: 12px; margin-bottom: 16px;
}
.result-card {
  background: var(--white); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 16px 10px; text-align: center;
  box-shadow: var(--shadow-sm);
}
.result-card.primary {
  background: var(--primary); border-color: var(--primary);
}
.result-card.primary .result-num,
.result-card.primary .result-label { color: var(--white); }
.result-num {
  display: block; font-family: var(--font-display);
  font-size: 2rem; color: var(--ink); line-height: 1.1;
}
.result-label {
  display: block; font-size: 11px; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.07em;
  color: var(--ink-mute); margin-top: 4px;
}
.result-detail { font-size: 14px; color: var(--ink-soft); text-align: center; margin-bottom: 8px; }
.result-fun { font-size: 13px; color: var(--primary); text-align: center; font-style: italic; }

/* ---- Ad slots ---- */
.ad-slot {
  background: var(--white); border: 1px dashed var(--border);
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  color: var(--ink-mute); font-size: 12px;
}
.ad-leaderboard { min-height: 90px; margin: 28px auto; }
.ad-rectangle { min-height: 250px; margin: 0 auto 40px; max-width: 700px; }

/* ---- Tools grid (used on EVERY page) ---- */
.tools-section { padding: 48px 0 40px; }
.section-title {
  font-family: var(--font-display); font-size: 2rem;
  color: var(--ink); margin-bottom: 6px;
}
.section-sub { font-size: 15px; color: var(--ink-soft); margin-bottom: 24px; }

.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 12px;
}
.tool-card {
  background: var(--white); border: 1.5px solid var(--border);
  border-radius: var(--radius); padding: 16px 18px;
  text-decoration: none; color: var(--ink);
  display: flex; align-items: flex-start; gap: 12px;
  transition: box-shadow 0.15s, transform 0.15s, border-color 0.15s;
}
.tool-card:hover {
  box-shadow: var(--shadow-md); transform: translateY(-2px);
  border-color: var(--primary);
}
.tool-card--active {
  border-color: var(--primary); background: var(--primary-lt);
  pointer-events: none;
}
.tool-card--active .tool-icon { opacity: 0.6; }
.tool-icon { font-size: 26px; flex-shrink: 0; margin-top: 1px; }
.tool-text h3 { font-size: 14px; font-weight: 600; margin-bottom: 3px; }
.tool-text p { font-size: 12px; color: var(--ink-soft); line-height: 1.4; }

/* ---- Page hero (sub-pages) ---- */
.page-hero {
  background: linear-gradient(135deg, #dbeafe 0%, #eff6ff 60%, #fef3c7 100%);
  padding: 48px 0; border-bottom: 1px solid var(--border);
}
.page-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem,4vw,3rem); color: var(--ink);
}
.page-hero h1 em { color: var(--primary); font-style: italic; }
.page-hero p { color: var(--ink-soft); font-size: 16px; margin-top: 10px; max-width: 480px; }
.page-body { padding: 40px 0 60px; }

/* ---- Standalone calc card (sub-pages) ---- */
.calc-standalone {
  background: var(--white); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 32px;
  max-width: 600px; box-shadow: var(--shadow-md);
}

/* ---- FAQ ---- */
.faq-section { padding: 0 0 48px; }
.faq-list { display: flex; flex-direction: column; gap: 8px; max-width: 780px; }
.faq-item {
  background: var(--white); border: 1px solid var(--border);
  border-radius: var(--radius-sm); overflow: hidden;
}
.faq-item summary {
  padding: 16px 20px; font-weight: 500; font-size: 15px;
  cursor: pointer; list-style: none;
  display: flex; justify-content: space-between; align-items: center;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: '+'; font-size: 20px; color: var(--primary);
  font-weight: 300; transition: transform 0.2s; flex-shrink: 0;
}
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item p { padding: 0 20px 16px; font-size: 14px; color: var(--ink-soft); line-height: 1.7; }

/* ---- Info / prose section ---- */
.info-section { padding: 0 0 60px; }
.info-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.info-block h2 { font-family: var(--font-display); font-size: 1.5rem; color: var(--ink); margin-bottom: 12px; }
.info-block p { font-size: 15px; color: var(--ink-soft); line-height: 1.7; margin-bottom: 12px; }
.info-block ul { padding-left: 20px; }
.info-block li { font-size: 15px; color: var(--ink-soft); line-height: 1.7; margin-bottom: 6px; }
.info-block strong { color: var(--ink); }

/* ---- Legal pages ---- */
.legal-page { padding: 48px 0 80px; }
.legal-page h1 { font-family: var(--font-display); font-size: 2.5rem; margin-bottom: 8px; }
.legal-page .updated { font-size: 13px; color: var(--ink-mute); margin-bottom: 40px; }
.legal-page h2 { font-family: var(--font-display); font-size: 1.4rem; margin: 32px 0 12px; }
.legal-page p, .legal-page li { font-size: 15px; color: var(--ink-soft); line-height: 1.8; margin-bottom: 10px; }
.legal-page ul { padding-left: 20px; margin-bottom: 16px; }
.legal-max { max-width: 720px; }

/* ---- Footer ---- */
.site-footer {
  background: var(--ink); color: rgba(255,255,255,0.6);
  padding: 48px 0 0;
}
.footer-inner {
  display: grid; grid-template-columns: 1fr 2fr;
  gap: 48px; padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.footer-brand .logo-text { color: var(--white); font-size: 20px; }
.footer-brand p { font-size: 14px; margin-top: 8px; line-height: 1.6; }
.footer-links { display: flex; gap: 48px; flex-wrap: wrap; }
.footer-col { display: flex; flex-direction: column; gap: 10px; min-width: 120px; }
.footer-col h4 { font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.09em; color: var(--white); margin-bottom: 4px; }
.footer-col a { font-size: 14px; color: rgba(255,255,255,0.55); text-decoration: none; transition: color 0.15s; }
.footer-col a:hover { color: var(--accent); }
.footer-bottom { padding: 20px 0; font-size: 13px; text-align: center; }

/* ---- Utility ---- */
.mt-4 { margin-top: 16px; }
.mb-4 { margin-bottom: 16px; }

/* ---- Responsive ---- */
@media (max-width: 768px) {
  .hero-inner { grid-template-columns: 1fr; gap: 28px; }
  .hero-text { padding-bottom: 0; }
  .hero-text h1 { font-size: 2.2rem; }
  .calc-card { border-radius: var(--radius); }
  .date-row { flex-direction: column; gap: 14px; }
  .arrow-divider { transform: rotate(90deg); align-self: center; padding: 0; }
  .results-grid { grid-template-columns: repeat(2,1fr); }
  .info-grid { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; gap: 28px; }
  .site-nav { display: none; flex-direction: column; position: absolute; top: 64px; left: 0; right: 0; background: var(--white); border-bottom: 1px solid var(--border); padding: 16px 24px; gap: 14px; box-shadow: var(--shadow-md); }
  .site-nav.open { display: flex; }
  .mob-menu-btn { display: block; }
  .tools-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
  .tools-grid { grid-template-columns: 1fr; }
  .results-grid { grid-template-columns: repeat(2,1fr); }
}