/*
 * GrowChart Public Pages — Shared Design System
 * Single source of truth for all landing, tools, and blog pages.
 * Brand tokens match the app design system (GEMINI.md §5).
 */

:root {
  --bg:           #f8fafc;
  --surface:      #ffffff;
  --surface-2:    #f1f5f9;
  --border:       #e2e8f0;
  --primary:      #38bdf8;
  --primary-dark: #0ea5e9;
  --text:         #0f172a;
  --muted:        #64748b;
  --subtle:       #94a3b8;
  --nav-bg:       rgba(248,250,252,0.85);
  --good:         #16a34a;
  --warn:         #ca8a04;
  --danger:       #dc2626;
  --radius-sm:    8px;
  --radius:       14px;
  --radius-lg:    24px;
  --radius-xl:    32px;
  --shadow:       0 4px 24px rgba(0,0,0,0.08);
}
html.dark {
  --bg:           #0f172a;
  --surface:      #1e293b;
  --surface-2:    #263348;
  --border:       #334155;
  --text:         #f1f5f9;
  --muted:        #94a3b8;
  --subtle:       #64748b;
  --nav-bg:       rgba(15,23,42,0.88);
  --good:         #4ade80;
  --warn:         #facc15;
  --danger:       #f87171;
  --shadow:       0 4px 24px rgba(0,0,0,0.4);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: 'DM Sans', 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--primary); text-decoration: none; }
a:hover { opacity: 0.85; }
img { max-width: 100%; display: block; }

/* ── Typography ─────────────────────────────────────── */
h1 { font-family: 'Syne', sans-serif; font-size: clamp(1.9rem, 5vw, 3rem); font-weight: 800; line-height: 1.15; color: var(--text); }
h2 { font-family: 'Syne', sans-serif; font-size: clamp(1.3rem, 3vw, 1.75rem); font-weight: 700; color: var(--text); margin-top: 2.5rem; margin-bottom: 0.75rem; }
h3 { font-size: 1.1rem; font-weight: 700; color: var(--text); margin-bottom: 0.5rem; }
p  { color: var(--muted); margin-bottom: 1rem; }
strong { color: var(--text); }
code { font-family: 'JetBrains Mono', monospace; font-size: 0.85em; background: var(--surface); padding: 2px 6px; border-radius: 4px; color: var(--primary); }
ul, ol { padding-left: 1.5rem; color: var(--muted); }
li { margin-bottom: 0.4rem; }

/* ── Navigation ─────────────────────────────────────── */
.gc-nav {
  position: sticky; top: 0; z-index: 100;
  display: flex; justify-content: space-between; align-items: center;
  padding: 0.85rem 2rem;
  background: var(--nav-bg);
  backdrop-filter: blur(16px) saturate(1.4);
  border-bottom: 1px solid var(--border);
}
.gc-nav-logo {
  font-family: 'Syne', sans-serif;
  font-size: 1.3rem; font-weight: 800;
  color: var(--text);
  letter-spacing: -0.02em;
}
.gc-nav-logo span { color: var(--primary); }
.gc-nav-links { display: flex; gap: 1.5rem; align-items: center; }
.gc-nav-links a { font-size: 0.875rem; font-weight: 500; color: var(--muted); transition: color 0.2s; }
.gc-nav-links a:hover { color: var(--text); }
.gc-btn-primary {
  display: inline-flex; align-items: center; gap: 0.4rem;
  padding: 0.55rem 1.25rem;
  background: var(--primary); color: #0f172a;
  font-size: 0.875rem; font-weight: 700;
  border-radius: var(--radius-sm);
  transition: opacity 0.2s, transform 0.15s;
  border: none; cursor: pointer;
}
.gc-btn-primary:hover { opacity: 0.9; transform: translateY(-1px); }
.gc-btn-secondary {
  display: inline-flex; align-items: center; gap: 0.4rem;
  padding: 0.55rem 1.25rem;
  background: var(--surface); color: var(--text);
  font-size: 0.875rem; font-weight: 600;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  transition: background 0.2s;
  cursor: pointer;
}
.gc-btn-secondary:hover { background: var(--surface-2); }
.gc-theme-btn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 32px; height: 32px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-sm); cursor: pointer;
  font-size: 1rem; line-height: 1; color: var(--muted);
  transition: background 0.2s, border-color 0.2s;
}
.gc-theme-btn:hover { background: var(--surface-2); border-color: var(--subtle); }
@media (max-width: 600px) {
  .gc-nav-links .hide-mobile { display: none; }
  .gc-nav { padding: 0.75rem 1rem; }
}

/* ── Page container ─────────────────────────────────── */
.gc-page { max-width: 860px; margin: 0 auto; padding: 3rem 1.5rem 6rem; }
.gc-page-wide { max-width: 1080px; margin: 0 auto; padding: 3rem 1.5rem 6rem; }

/* ── Breadcrumb ─────────────────────────────────────── */
.gc-breadcrumb { display: flex; gap: 0.5rem; align-items: center; font-size: 0.8rem; color: var(--subtle); margin-bottom: 2rem; }
.gc-breadcrumb a { color: var(--subtle); }
.gc-breadcrumb a:hover { color: var(--primary); }
.gc-breadcrumb span { color: var(--border); }

/* ── Hero ───────────────────────────────────────────── */
.gc-hero { margin-bottom: 3rem; }
.gc-hero-badge {
  display: inline-flex; align-items: center; gap: 0.4rem;
  background: rgba(56,189,248,0.1); border: 1px solid rgba(56,189,248,0.25);
  color: var(--primary); font-size: 0.75rem; font-weight: 700;
  padding: 0.3rem 0.75rem; border-radius: 100px;
  text-transform: uppercase; letter-spacing: 0.05em;
  margin-bottom: 1rem;
}
.gc-hero p { font-size: 1.1rem; color: var(--muted); max-width: 650px; margin-top: 0.75rem; }

/* ── Calculator Card ────────────────────────────────── */
.gc-calc-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 2rem;
  margin-bottom: 3rem;
  box-shadow: var(--shadow);
}
.gc-calc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; }
@media (max-width: 600px) { .gc-calc-grid { grid-template-columns: 1fr; } }
.gc-field { display: flex; flex-direction: column; gap: 0.4rem; }
.gc-field label { font-size: 0.8rem; font-weight: 700; color: var(--muted); text-transform: uppercase; letter-spacing: 0.06em; }
.gc-field input, .gc-field select {
  background: var(--bg); border: 1px solid var(--border);
  color: var(--text); padding: 0.7rem 0.9rem;
  border-radius: var(--radius-sm); font-size: 1rem;
  transition: border-color 0.2s;
  -webkit-appearance: none; appearance: none;
  font-family: inherit;
}
.gc-field input:focus, .gc-field select:focus {
  outline: none; border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(56,189,248,0.15);
}
.gc-calc-btn {
  width: 100%; padding: 0.9rem;
  background: var(--primary); color: #0f172a;
  font-weight: 800; font-size: 1rem; font-family: inherit;
  border: none; border-radius: var(--radius-sm);
  cursor: pointer; margin-top: 1.5rem;
  transition: opacity 0.2s, transform 0.15s;
}
.gc-calc-btn:hover { opacity: 0.9; transform: translateY(-1px); }
.gc-result {
  display: none; /* shown by JS */
  margin-top: 1.5rem;
  padding: 1.5rem;
  background: var(--bg); border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  animation: fadeUp 0.3s ease;
}
.gc-result.visible { display: block; }
@keyframes fadeUp { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }
.gc-result-main { font-family: 'Syne', sans-serif; font-size: 3rem; font-weight: 800; line-height: 1; }
.gc-result-label { font-size: 0.8rem; font-weight: 700; color: var(--muted); text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 0.5rem; }
.gc-result-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; margin-top: 1.25rem; }
@media (max-width: 500px) { .gc-result-grid { grid-template-columns: 1fr 1fr; } }
.gc-stat { background: var(--surface); border-radius: var(--radius); padding: 0.9rem; text-align: center; }
.gc-stat-val { font-family: 'JetBrains Mono', monospace; font-size: 1.3rem; font-weight: 700; }
.gc-stat-label { font-size: 0.7rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.06em; margin-top: 0.2rem; }
.status-normal  { color: var(--good); }
.status-watch   { color: var(--warn); }
.status-concern { color: var(--danger); }
.gc-disclaimer {
  font-size: 0.78rem; color: var(--subtle);
  background: rgba(100,116,139,0.08);
  border: 1px solid rgba(100,116,139,0.15);
  border-radius: var(--radius); padding: 0.85rem 1rem;
  margin-top: 1.25rem; line-height: 1.5;
}

/* ── Article / Blog ─────────────────────────────────── */
.gc-article { font-family: 'Source Serif 4', serif; }
.gc-article h2 { font-family: 'Syne', sans-serif; color: var(--text); margin-top: 2.5rem; border-bottom: 1px solid var(--border); padding-bottom: 0.5rem; }
.gc-article p { color: var(--muted); font-size: 1rem; line-height: 1.85; }
.gc-article ul, .gc-article ol { color: var(--muted); font-size: 1rem; line-height: 1.85; }
.gc-article li { margin-bottom: 0.5rem; }
.gc-article .gc-highlight {
  background: var(--surface); border-left: 3px solid var(--primary);
  padding: 1rem 1.25rem; border-radius: 0 var(--radius) var(--radius) 0;
  margin: 1.5rem 0;
}
.gc-article .gc-highlight p { color: var(--text); margin-bottom: 0; }
.gc-article table { width: 100%; border-collapse: collapse; font-size: 0.9rem; margin: 1.5rem 0; }
.gc-article th { background: var(--surface); color: var(--text); padding: 0.6rem 0.9rem; text-align: left; font-weight: 700; }
.gc-article td { padding: 0.6rem 0.9rem; border-bottom: 1px solid var(--border); color: var(--muted); }
.gc-meta { font-size: 0.8rem; color: var(--subtle); margin-bottom: 2rem; display: flex; gap: 1rem; flex-wrap: wrap; }
.gc-meta span::before { content: '· '; }
.gc-meta span:first-child::before { content: ''; }

/* ── FAQ Accordion ──────────────────────────────────── */
.gc-faq { margin-top: 3rem; }
.gc-faq-item { border-bottom: 1px solid var(--border); }
.gc-faq-q {
  display: flex; justify-content: space-between; align-items: center;
  padding: 1.1rem 0; cursor: pointer;
  font-weight: 600; color: var(--text); font-size: 0.95rem;
  background: none; border: none; width: 100%; text-align: left;
  list-style: none;
}
.gc-faq-q::after { content: '+'; font-size: 1.4rem; color: var(--primary); transition: transform 0.2s; flex-shrink: 0; }
details[open] .gc-faq-q::after { transform: rotate(45deg); }
.gc-faq-a { padding: 0 0 1.1rem; color: var(--muted); font-size: 0.9rem; line-height: 1.7; }

/* ── Related Links ──────────────────────────────────── */
.gc-related { margin-top: 3rem; }
.gc-related-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 1rem; margin-top: 1rem; }
.gc-related-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 1.1rem 1.25rem;
  transition: border-color 0.2s, transform 0.15s;
  display: block; color: var(--text);
}
.gc-related-card:hover { border-color: var(--primary); transform: translateY(-2px); }
.gc-related-card .title { font-weight: 700; font-size: 0.875rem; margin-bottom: 0.3rem; }
.gc-related-card .desc { font-size: 0.78rem; color: var(--muted); }

/* ── CTA Banner ─────────────────────────────────────── */
.gc-cta {
  background: linear-gradient(135deg, rgba(56,189,248,0.08), rgba(129,140,248,0.08));
  border: 1px solid rgba(56,189,248,0.2);
  border-radius: var(--radius-xl);
  padding: 2.5rem 2rem;
  text-align: center;
  margin-top: 3rem;
}
.gc-cta h3 { font-family: 'Syne', sans-serif; font-size: 1.5rem; font-weight: 800; margin-bottom: 0.5rem; }
.gc-cta p { color: var(--muted); font-size: 0.9rem; margin-bottom: 1.25rem; }
.gc-cta-actions { display: flex; gap: 0.75rem; justify-content: center; flex-wrap: wrap; }

/* ── Footer ─────────────────────────────────────────── */
.gc-footer {
  border-top: 1px solid var(--border);
  padding: 2rem 1.5rem;
  text-align: center;
  color: var(--subtle);
  font-size: 0.78rem;
  line-height: 1.9;
}
.gc-footer a { color: var(--subtle); }
.gc-footer a:hover { color: var(--primary); }

/* ── Conversion Layer ────────────────────────────────── */
.gc-conversion {
  margin-top: 1.5rem;
  padding: 1.75rem;
  background: linear-gradient(135deg, rgba(56,189,248,0.06), rgba(129,140,248,0.06));
  border: 1px solid rgba(56,189,248,0.2);
  border-radius: var(--radius-xl);
  text-align: center;
  animation: fadeUp 0.4s ease;
}
.gc-conversion-badge {
  display: inline-block;
  font-size: 0.7rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em;
  color: var(--primary);
  background: rgba(56,189,248,0.1);
  border: 1px solid rgba(56,189,248,0.2);
  padding: 0.25rem 0.7rem;
  border-radius: 100px;
  margin-bottom: 0.75rem;
}
.gc-conversion-heading {
  font-family: 'Syne', sans-serif;
  font-size: 1.35rem; font-weight: 800;
  color: var(--text);
  margin-bottom: 0.5rem;
  line-height: 1.3;
}
.gc-conversion-heading strong { color: var(--primary); }
.gc-conversion-body {
  font-size: 0.9rem;
  color: var(--muted);
  max-width: 520px;
  margin: 0 auto 1rem;
  line-height: 1.6;
}
.gc-conversion-actions {
  display: flex; gap: 0.65rem; justify-content: center; flex-wrap: wrap;
}
.gc-btn-save {
  padding: 0.7rem 1.5rem;
  font-size: 0.95rem;
  border-radius: var(--radius);
}
.gc-conversion-footnote {
  font-size: 0.7rem;
  color: var(--subtle);
  margin-top: 0.75rem;
  margin-bottom: 0;
}

/* ── Interpretation Card ─────────────────────────────── */
.gc-interp {
  margin-top: 1.25rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
}
.gc-interp-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
}
.gc-interp-card .label {
  font-size: 0.7rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.06em; color: var(--subtle);
  margin-bottom: 0.3rem;
}
.gc-interp-card .value {
  font-size: 0.9rem;
  color: var(--text);
  line-height: 1.5;
}

/* ── Lead Capture ────────────────────────────────────── */
.gc-lead {
  margin-top: 3rem;
}
.gc-lead-card {
  background: linear-gradient(135deg, rgba(56,189,248,0.05), rgba(129,140,248,0.05));
  border: 1px solid rgba(56,189,248,0.15);
  border-radius: var(--radius-xl);
  padding: 2.5rem 2rem;
  text-align: center;
  max-width: 560px;
  margin: 0 auto;
}
.gc-lead-icon { font-size: 2.5rem; margin-bottom: 0.75rem; }
.gc-lead-card h3 { font-family: 'Syne', sans-serif; font-size: 1.3rem; font-weight: 800; margin-bottom: 0.5rem; }
.gc-lead-card p { font-size: 0.88rem; color: var(--muted); margin-bottom: 1.25rem; }
.gc-lead-fields {
  display: flex; gap: 0.5rem;
  max-width: 460px; margin: 0 auto;
}
.gc-lead-fields input {
  flex: 1;
  background: var(--bg); border: 1px solid var(--border);
  color: var(--text); padding: 0.7rem 0.9rem;
  border-radius: var(--radius-sm); font-size: 0.9rem;
  font-family: inherit;
}
.gc-lead-fields input:focus {
  outline: none; border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(56,189,248,0.15);
}
.gc-lead-note { font-size: 0.7rem; color: var(--subtle); margin-top: 0.5rem; margin-bottom: 0; }
.gc-lead-success { font-size: 0.88rem; font-weight: 700; color: var(--good); margin-top: 0.75rem; }
@media (max-width: 500px) {
  .gc-lead-fields { flex-direction: column; }
  .gc-conversion-actions { flex-direction: column; align-items: center; }
  .gc-conversion { padding: 1.25rem; }
}

/* ── Sticky Mobile CTA ───────────────────────────────── */
.gc-sticky-cta {
  display: none;
  position: fixed;
  bottom: 0; left: 0; right: 0;
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 0.75rem 1rem;
  z-index: 200;
  box-shadow: 0 -4px 20px rgba(0,0,0,0.1);
  animation: slideUp 0.3s ease;
}
@keyframes slideUp { from { transform: translateY(100%); } to { transform: translateY(0); } }
.gc-sticky-cta-inner {
  display: flex; gap: 0.6rem; align-items: center;
  max-width: 600px; margin: 0 auto;
}
.gc-sticky-cta-text {
  font-size: 0.78rem; font-weight: 700; color: var(--text);
  flex: 1; line-height: 1.3;
}
.gc-sticky-cta .gc-btn-primary {
  white-space: nowrap;
  font-size: 0.8rem;
  padding: 0.5rem 1rem;
}
@media (max-width: 640px) {
  .gc-sticky-cta { display: block; }
  body { padding-bottom: 70px; }
}

/* ── EEAT Section ────────────────────────────────────── */
.gc-eeat {
  margin-top: 3rem;
  padding: 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}
.gc-eeat h2 { margin-top: 0; }
.gc-eeat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1rem; margin-top: 1rem; }
.gc-eeat-card {
  text-align: center;
  padding: 1.25rem;
  background: var(--bg);
  border-radius: var(--radius);
}
.gc-eeat-card .avatar {
  width: 48px; height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--indigo, #818cf8));
  color: #0f172a;
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 1rem;
  margin: 0 auto 0.5rem;
}
.gc-eeat-card .name { font-size: 0.85rem; font-weight: 700; color: var(--text); }
.gc-eeat-card .role { font-size: 0.75rem; color: var(--muted); }
.gc-eeat-meta { font-size: 0.78rem; color: var(--subtle); margin-top: 0.75rem; text-align: center; }
.gc-eeat-meta strong { color: var(--muted); }

/* ── Guidance Cards ──────────────────────────────────── */
.gc-guidance-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 0.75rem;
  margin-top: 0.75rem;
}
.gc-guidance-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
  animation: fadeUp 0.4s ease;
}
.gc-guidance-feeding { border-left: 3px solid #38bdf8; }
.gc-guidance-activity { border-left: 3px solid #34d399; }
.gc-guidance-sleep { border-left: 3px solid #fbbf24; }
.gc-guidance-warning {
  margin-top: 0.75rem;
  background: rgba(251,191,36,0.06);
  border: 1px solid rgba(251,191,36,0.25);
  border-left: 3px solid #f59e0b;
}
.gc-guidance-card-icon { font-size: 1.3rem; margin-bottom: 0.3rem; }
.gc-guidance-card-title {
  font-size: 0.75rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.05em; color: var(--subtle);
  margin-bottom: 0.3rem;
}
.gc-guidance-card-text {
  font-size: 0.85rem;
  color: var(--text);
  line-height: 1.5;
}

/* ── Enhanced Interpretation Card ────────────────────── */
.gc-interp-clinical {
  margin-bottom: 0;
}
.gc-interp-header {
  display: flex; gap: 0.6rem; align-items: flex-start;
  margin-bottom: 0.5rem;
}
.gc-interp-icon { font-size: 1.4rem; line-height: 1; }
.gc-interp-label {
  font-size: 0.7rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.06em; color: var(--subtle);
}
.gc-interp-status {
  font-size: 0.9rem; font-weight: 700;
  color: var(--primary);
}
.gc-interp-value {
  font-size: 0.9rem;
  color: var(--text);
  line-height: 1.6;
}
.gc-interp-action {
  margin-top: 0.5rem;
  padding: 0.6rem 0.75rem;
  background: rgba(56,189,248,0.08);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  color: var(--text);
  line-height: 1.5;
}

/* ── Collapsible details ─────────────────────────────── */
.gc-interp-details {
  margin-top: 0.75rem;
}
.gc-interp-details details {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.6rem 1rem;
  cursor: pointer;
}
.gc-interp-details summary {
  font-size: 0.78rem; font-weight: 700;
  color: var(--muted);
  cursor: pointer;
  user-select: none;
}
.gc-interp-details summary::-webkit-details-marker { color: var(--subtle); }
.gc-interp-detail-body {
  margin-top: 0.6rem;
  font-size: 0.85rem;
  color: var(--text);
  line-height: 1.6;
}
.gc-interp-detail-body p { margin: 0.4rem 0; }

@media (max-width: 500px) {
  .gc-guidance-grid { grid-template-columns: 1fr; }
}

/* ── Utility ─────────────────────────────────────────── */
.text-good    { color: var(--good); }
.text-warn    { color: var(--warn); }
.text-danger  { color: var(--danger); }
.text-primary { color: var(--primary); }
.text-muted   { color: var(--muted); }
.mono         { font-family: 'JetBrains Mono', monospace; }
.mt-1 { margin-top: 0.5rem; } .mt-2 { margin-top: 1rem; } .mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; } .mb-2 { margin-bottom: 1rem; } .mb-3 { margin-bottom: 1.5rem; }
.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; }