/* ============================================================
   DateCalcs — visual system
   Direction: a calm, trustworthy calendar/utility. Light theme,
   slate + teal palette (distinct from timer-amber, grimoire-violet,
   wheel-pink), crisp cards, big tabular countdown numerals.
   ============================================================ */

:root {
  --bg:        #f6f8fa;
  --bg-raised: #ffffff;
  --bg-tint:   #eef4f5;
  --line:      #e2e8ec;
  --line-soft: #eef1f4;

  --ink:       #16232e;
  --ink-dim:   #4a5b68;
  --ink-faint: #8593a0;

  --teal:      #0d9488;
  --teal-dark: #0f766e;
  --teal-tint: #d5f0ec;
  --coral:     #ef6351;

  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --shadow: 0 8px 30px -12px rgba(16,35,46,0.18);
  --shadow-sm: 0 3px 12px -5px rgba(16,35,46,0.15);

  --font-display: "Fraunces", Georgia, serif;
  --font-body: "Inter", system-ui, sans-serif;
  --font-num: "Inter", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--bg); color: var(--ink); font-family: var(--font-body); -webkit-font-smoothing: antialiased; }
body { min-height: 100vh; display: flex; flex-direction: column; }
a { color: inherit; text-decoration: none; }
.site-shell { display: flex; flex-direction: column; min-height: 100vh; }

/* ---------------- Topbar ---------------- */
.topbar { display: flex; align-items: center; justify-content: space-between; max-width: 1040px; margin: 0 auto; width: 100%; padding: 1.1rem 1.5rem; }
.brand { display: flex; align-items: center; gap: 0.55rem; font-family: var(--font-display); font-weight: 600; font-size: 1.35rem; color: var(--ink); }
.brand-mark {
  width: 26px; height: 26px; border-radius: 7px; flex-shrink: 0; position: relative;
  background: var(--teal);
}
.brand-mark::before { content: ""; position: absolute; top: -3px; left: 6px; width: 3px; height: 7px; background: var(--teal-dark); border-radius: 2px; box-shadow: 11px 0 0 var(--teal-dark); }
.brand-mark::after { content: ""; position: absolute; inset: 7px 4px 4px; background: #fff; border-radius: 3px; }
.brand .teal { color: var(--teal); }
.topnav { display: flex; gap: 1.5rem; font-size: 0.92rem; color: var(--ink-dim); font-weight: 500; }
.topnav a:hover { color: var(--teal); }

/* ---------------- Layout ---------------- */
.main-content { flex: 1; max-width: 1040px; margin: 0 auto; width: 100%; padding: 0.5rem 1.5rem 5rem; }
.site-footer { border-top: 1px solid var(--line); padding: 1.75rem 1.5rem; margin-top: auto; background: var(--bg-raised); }
.footer-inner { max-width: 1040px; margin: 0 auto; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 0.75rem; font-size: 0.86rem; color: var(--ink-faint); }
.footer-links { display: flex; gap: 1.25rem; }
.footer-links a:hover { color: var(--teal); }

/* ---------------- Hero ---------------- */
.hero { padding: 2.5rem 0 1.5rem; text-align: center; }
.eyebrow { display: inline-block; font-weight: 600; font-size: 0.78rem; color: var(--teal); letter-spacing: 0.07em; text-transform: uppercase; margin-bottom: 0.7rem; }
.h1 { font-family: var(--font-display); font-weight: 600; font-size: clamp(2rem, 5vw, 3rem); letter-spacing: -0.01em; margin: 0 0 0.6rem; color: var(--ink); line-height: 1.08; }
.h1 .teal { color: var(--teal); }
.sub { color: var(--ink-dim); font-size: 1.05rem; max-width: 52ch; margin: 0 auto; line-height: 1.5; }

/* ---------------- Calculator cards ---------------- */
.calc-panel {
  max-width: 620px; margin: 2rem auto 0; background: var(--bg-raised);
  border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 2rem; box-shadow: var(--shadow);
}
.field-row { display: flex; gap: 1rem; flex-wrap: wrap; margin-bottom: 1.1rem; }
.field { flex: 1; min-width: 160px; display: flex; flex-direction: column; gap: 0.4rem; }
.field label { font-size: 0.82rem; font-weight: 600; color: var(--ink-dim); }
.field input, .field select {
  font-family: var(--font-body); font-size: 1rem; padding: 0.7rem 0.85rem;
  border: 1px solid var(--line); border-radius: var(--radius-sm); background: var(--bg); color: var(--ink);
}
.field input:focus, .field select:focus { outline: none; border-color: var(--teal); background: #fff; }

.calc-btn {
  font-family: var(--font-body); font-weight: 600; font-size: 1rem;
  padding: 0.8rem 1.8rem; border-radius: 999px; border: none;
  background: var(--teal); color: #fff; cursor: pointer; transition: background 0.12s ease, transform 0.12s ease;
}
.calc-btn:hover { background: var(--teal-dark); transform: translateY(-1px); }

.calc-result {
  margin-top: 1.5rem; padding-top: 1.5rem; border-top: 1px solid var(--line-soft);
  text-align: center; min-height: 2rem;
}
.result-big { font-family: var(--font-num); font-weight: 800; font-size: clamp(2.2rem, 7vw, 3.4rem); color: var(--teal); line-height: 1; font-variant-numeric: tabular-nums; }
.result-unit { font-size: 1rem; color: var(--ink-faint); font-weight: 500; margin-left: 0.3rem; }
.result-detail { color: var(--ink-dim); margin-top: 0.6rem; font-size: 0.98rem; }

/* ---------------- Countdown page ---------------- */
.countdown-stage { text-align: center; padding: 2rem 0; }
.cd-number {
  font-family: var(--font-num); font-weight: 800; font-variant-numeric: tabular-nums;
  font-size: clamp(4rem, 18vw, 9rem); line-height: 0.95; color: var(--teal);
  letter-spacing: -0.03em;
}
.cd-unit { font-family: var(--font-display); font-weight: 600; font-size: clamp(1.3rem, 4vw, 2rem); color: var(--ink); }
.cd-target { color: var(--ink-dim); font-size: 1.05rem; margin-top: 0.75rem; }

/* ---------------- Grids ---------------- */
.section-label { font-family: var(--font-display); font-weight: 600; font-size: 1.4rem; margin: 3rem 0 1.25rem; text-align: center; }
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 0.85rem; }
.tool-card {
  display: flex; flex-direction: column; gap: 0.35rem; padding: 1.4rem 1.25rem;
  border-radius: var(--radius-md); border: 1px solid var(--line); background: var(--bg-raised);
  transition: border-color 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
}
.tool-card:hover { border-color: var(--teal); transform: translateY(-2px); box-shadow: var(--shadow-sm); }
.tool-card-title { font-family: var(--font-display); font-weight: 600; font-size: 1.2rem; color: var(--ink); }
.tool-card-title .arrow { color: var(--coral); }
.tool-card-desc { font-size: 0.85rem; color: var(--ink-faint); line-height: 1.4; }

.cd-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 0.6rem; }
.cd-card {
  display: flex; flex-direction: column; align-items: flex-start; gap: 0.15rem;
  padding: 1rem 1.1rem; border-radius: var(--radius-sm); border: 1px solid var(--line);
  background: var(--bg-raised); transition: border-color 0.12s ease, transform 0.12s ease;
}
.cd-card:hover { border-color: var(--teal); transform: translateY(-2px); }
.cd-card-days { font-family: var(--font-num); font-weight: 800; font-size: 1.5rem; color: var(--teal); font-variant-numeric: tabular-nums; }
.cd-card-name { font-size: 0.88rem; color: var(--ink-dim); }

/* ---------------- SEO content ---------------- */
.info-section { margin-top: 3.5rem; display: grid; gap: 2rem; max-width: 720px; margin-left: auto; margin-right: auto; }
.info-block h2 { font-family: var(--font-display); font-weight: 600; font-size: 1.5rem; margin: 0 0 0.6rem; color: var(--ink); }
.info-block p { color: var(--ink-dim); line-height: 1.7; margin: 0 0 0.75rem; font-size: 1rem; }
.faq-item { border-bottom: 1px solid var(--line-soft); padding: 1.1rem 0; }
.faq-item:last-child { border-bottom: none; }
.faq-q { font-weight: 600; font-size: 1rem; margin: 0 0 0.4rem; color: var(--ink); }
.faq-a { color: var(--ink-dim); font-size: 0.96rem; line-height: 1.6; margin: 0; }

/* ---------------- Static pages ---------------- */
.prose-page { max-width: 700px; margin: 0 auto; }
.prose-page h1 { font-family: var(--font-display); font-weight: 600; font-size: 2.2rem; margin-bottom: 1rem; }
.prose-page h2 { font-family: var(--font-display); font-weight: 600; font-size: 1.4rem; margin: 1.75rem 0 0.6rem; }
.prose-page p { color: var(--ink-dim); line-height: 1.75; margin-bottom: 0.9rem; }
.prose-page a { color: var(--teal); }

@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }