/* ─────────────────────────────────────────────
   CSS Variables (Light + Dark)
   ───────────────────────────────────────────── */
:root {
  --card: #ffffff;
  --ring: #d4d4d8;
  --input: #d4d4d8;
  --muted: #f4f4f5;
  --accent: #f4f4f5;
  --border: #e4e4e7;
  --radius: 0.625rem;
  --popover: #ffffff;
  --primary: #18181b;
  --sidebar: #fafafa;
  --secondary: #f4f4f5;
  --background: #ffffff;
  --foreground: #0a0a0a;
  --destructive: #ef4444;
  --card-foreground: #0a0a0a;
  --muted-foreground: #71717a;
  --accent-foreground: #18181b;
  --popover-foreground: #0a0a0a;
  --primary-foreground: #fafafa;
  --secondary-foreground: #18181b;
  --destructive-foreground: #fafafa;

  /* Extended palette */
  --brand-primary: #6366f1;
  --brand-secondary: #8b5cf6;
  --brand-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
  --surface-elevated: #ffffff;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.08), 0 2px 6px rgba(0,0,0,0.05);
  --shadow-lg: 0 10px 40px rgba(0,0,0,0.1), 0 4px 16px rgba(0,0,0,0.06);
  --shadow-brand: 0 8px 32px rgba(99, 102, 241, 0.25);

  --font-sans: 'Inter', ui-sans-serif, system-ui, -apple-system, sans-serif;
  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.dark {
  --card: #111113;
  --ring: #52525b;
  --input: #27272a;
  --muted: #18181b;
  --accent: #18181b;
  --border: #27272a;
  --popover: #111113;
  --primary: #fafafa;
  --sidebar: #0d0d0f;
  --secondary: #27272a;
  --background: #0a0a0a;
  --foreground: #fafafa;
  --destructive: #ef4444;
  --card-foreground: #fafafa;
  --muted-foreground: #a1a1aa;
  --accent-foreground: #fafafa;
  --popover-foreground: #fafafa;
  --primary-foreground: #18181b;
  --secondary-foreground: #fafafa;
  --destructive-foreground: #fafafa;

  --surface-elevated: #18181b;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.4), 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.5), 0 2px 6px rgba(0,0,0,0.3);
  --shadow-lg: 0 10px 40px rgba(0,0,0,0.6), 0 4px 16px rgba(0,0,0,0.4);
  --shadow-brand: 0 8px 32px rgba(99, 102, 241, 0.4);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background: var(--background);
  color: var(--foreground);
  line-height: 1.6;
  transition: background var(--transition), color var(--transition);
  overflow-x: hidden;
}

/* ─────────────────────────────────────────────
   Layout
   ───────────────────────────────────────────── */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ─────────────────────────────────────────────
   Header
   ───────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition), border-color var(--transition);
}

.dark .site-header {
  background: rgba(10,10,10,0.85);
}

.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 64px;
  display: flex;
  align-items: center;
  gap: 2rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  flex-shrink: 0;
}

.logo-text {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--foreground);
  letter-spacing: -0.03em;
}

.logo-accent { color: var(--brand-primary); }

.header-nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  flex: 1;
}

.nav-link {
  padding: 0.375rem 0.875rem;
  border-radius: 6px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--muted-foreground);
  text-decoration: none;
  transition: color var(--transition), background var(--transition);
}

.nav-link:hover, .nav-link.active {
  color: var(--foreground);
  background: var(--muted);
}

.theme-toggle {
  width: 38px;
  height: 38px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--foreground);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
  flex-shrink: 0;
}

.theme-toggle:hover {
  background: var(--muted);
  border-color: var(--ring);
}

.mobile-menu-toggle {
  display: none;
}

.mobile-menu-toggle line {
  transition: transform var(--transition), opacity var(--transition);
  transform-origin: 12px 12px;
}

/* ─────────────────────────────────────────────
   Hero
   ───────────────────────────────────────────── */
.hero {
  position: relative;
  padding: 5rem 1.5rem 4rem;
  text-align: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.25;
  animation: float 8s ease-in-out infinite;
}

.hero-orb-1 {
  width: 400px; height: 400px;
  background: radial-gradient(circle, #6366f1, transparent 70%);
  top: -100px; left: -100px;
  animation-delay: 0s;
}

.hero-orb-2 {
  width: 350px; height: 350px;
  background: radial-gradient(circle, #8b5cf6, transparent 70%);
  top: -50px; right: -80px;
  animation-delay: -3s;
}

.hero-orb-3 {
  width: 300px; height: 300px;
  background: radial-gradient(circle, #ec4899, transparent 70%);
  bottom: -80px; left: 50%;
  transform: translateX(-50%);
  animation-delay: -5s;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-20px); }
}

.hero-content { position: relative; z-index: 1; }

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.2);
  color: var(--brand-primary);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.35rem 0.875rem;
  border-radius: 100px;
  margin-bottom: 1.5rem;
  letter-spacing: 0.02em;
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.04em;
  color: var(--foreground);
  margin-bottom: 1.25rem;
}

.hero-gradient {
  background: var(--brand-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--muted-foreground);
  max-width: 520px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ─────────────────────────────────────────────
   Card
   ───────────────────────────────────────────── */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow-md);
  transition: background var(--transition), border-color var(--transition), box-shadow var(--transition);
}

/* ─────────────────────────────────────────────
   Calculator Section
   ───────────────────────────────────────────── */
.calc-section {
  padding: 2rem 0 4rem;
}

.calc-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

@media (max-width: 768px) {
  .calc-grid { grid-template-columns: 1fr; }
}

.calc-card {
  padding: 2rem;
}

.card-header {
  margin-bottom: 1.75rem;
}

.card-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--foreground);
  margin-bottom: 0.25rem;
}

.card-subtitle {
  font-size: 0.875rem;
  color: var(--muted-foreground);
}

/* ─────────────────────────────────────────────
   Unit Toggle
   ───────────────────────────────────────────── */
.unit-toggle-group {
  display: flex;
  background: var(--muted);
  border-radius: 10px;
  padding: 3px;
  margin-bottom: 1.75rem;
  gap: 2px;
}

.unit-btn {
  flex: 1;
  padding: 0.5rem 1rem;
  border: none;
  border-radius: 7px;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  background: transparent;
  color: var(--muted-foreground);
  transition: all var(--transition);
}

.unit-btn.active {
  background: var(--card);
  color: var(--foreground);
  box-shadow: var(--shadow-sm);
}

/* ─────────────────────────────────────────────
   Form
   ───────────────────────────────────────────── */
.bmi-form { display: flex; flex-direction: column; gap: 1.25rem; }

.form-group { display: flex; flex-direction: column; gap: 0.5rem; }

.form-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--foreground);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.label-hint {
  font-weight: 400;
  color: var(--muted-foreground);
  font-size: 0.8rem;
}

.input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.input-icon {
  position: absolute;
  left: 0.875rem;
  color: var(--muted-foreground);
  pointer-events: none;
  flex-shrink: 0;
}

.form-input {
  width: 100%;
  padding: 0.7rem 3rem 0.7rem 2.5rem;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  background: var(--background);
  color: var(--foreground);
  font-size: 0.9375rem;
  font-family: var(--font-sans);
  font-weight: 500;
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
  outline: none;
  -moz-appearance: textfield;
}

.form-input::-webkit-outer-spin-button,
.form-input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }

.form-input:focus {
  border-color: var(--brand-primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.12);
}

.form-input.error {
  border-color: var(--destructive);
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.form-input::placeholder { color: var(--muted-foreground); font-weight: 400; }

.input-unit {
  position: absolute;
  right: 0.875rem;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--muted-foreground);
  pointer-events: none;
}

.form-error {
  font-size: 0.8rem;
  color: var(--destructive);
  min-height: 1.2em;
  font-weight: 500;
}

/* Imperial row */
.imperial-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.imperial-row .form-input { padding-left: 0.875rem; }
.imperial-row .input-wrapper:first-child .form-input { padding-left: 2.5rem; }

/* ─────────────────────────────────────────────
   Gender Selector
   ───────────────────────────────────────────── */
.gender-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.gender-option input[type="radio"] { display: none; }

.gender-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  padding: 0.875rem;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  cursor: pointer;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--muted-foreground);
  transition: all var(--transition);
  background: var(--background);
}

.gender-card:hover {
  border-color: var(--brand-primary);
  color: var(--brand-primary);
  background: rgba(99, 102, 241, 0.05);
}

.gender-option input:checked + .gender-card {
  border-color: var(--brand-primary);
  background: rgba(99, 102, 241, 0.08);
  color: var(--brand-primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.12);
}

/* ─────────────────────────────────────────────
   Buttons
   ───────────────────────────────────────────── */
.calc-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.875rem 2rem;
  background: var(--brand-gradient);
  color: #fff;
  border: none;
  border-radius: 12px;
  font-size: 1rem;
  font-weight: 700;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: all var(--transition);
  box-shadow: var(--shadow-brand);
  margin-top: 0.5rem;
  letter-spacing: -0.01em;
}

.calc-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 12px 40px rgba(99, 102, 241, 0.4);
}

.calc-btn:active { transform: translateY(0); }

.reset-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.6rem;
  background: transparent;
  color: var(--muted-foreground);
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 0.875rem;
  font-weight: 500;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: all var(--transition);
}

.reset-btn:hover {
  background: var(--muted);
  color: var(--foreground);
  border-color: var(--ring);
}

/* ─────────────────────────────────────────────
   Result Card
   ───────────────────────────────────────────── */
.result-card {
  padding: 2rem;
  display: flex;
  flex-direction: column;
}

.result-placeholder {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  min-height: 300px;
  text-align: center;
}

.placeholder-icon {
  width: 80px;
  height: 80px;
  border-radius: 20px;
  background: var(--muted);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--muted-foreground);
}

.placeholder-text {
  font-size: 0.9375rem;
  color: var(--muted-foreground);
  max-width: 240px;
  line-height: 1.6;
}

.result-content { flex: 1; display: flex; flex-direction: column; gap: 1.25rem; }

/* ─────────────────────────────────────────────
   Gauge
   ───────────────────────────────────────────── */
.gauge-container {
  display: flex;
  justify-content: center;
}

.gauge-svg {
  width: 100%;
  max-width: 260px;
  height: auto;
  overflow: visible;
}

.arc-segment {
  transition: opacity 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

#gaugeNeedle {
  transform-origin: 110px 115px;
  transition: transform 0.8s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.gauge-value-text {
  font-family: var(--font-sans);
  transition: all 0.4s ease;
}

/* ─────────────────────────────────────────────
   Category Badge
   ───────────────────────────────────────────── */
.category-badge-container {
  display: flex;
  justify-content: center;
}

.category-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1.25rem;
  border-radius: 100px;
  font-size: 0.9375rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  transition: all 0.4s ease;
}

.badge-underweight { background: rgba(59, 130, 246, 0.12); color: #3b82f6; }
.badge-normal      { background: rgba(16, 185, 129, 0.12); color: #10b981; }
.badge-overweight  { background: rgba(245, 158, 11, 0.12); color: #f59e0b; }
.badge-obese       { background: rgba(239, 68, 68, 0.12);  color: #ef4444; }

/* ─────────────────────────────────────────────
   Stats Grid
   ───────────────────────────────────────────── */
.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.stat-item {
  background: var(--muted);
  border-radius: 10px;
  padding: 0.875rem 1rem;
  transition: background var(--transition);
}

.stat-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--muted-foreground);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.3rem;
}

.stat-value {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--foreground);
  letter-spacing: -0.03em;
}

.stat-small { font-size: 1rem; }

/* ─────────────────────────────────────────────
   Health Message
   ───────────────────────────────────────────── */
.health-message {
  padding: 0.875rem 1rem;
  border-radius: 10px;
  font-size: 0.875rem;
  line-height: 1.6;
  font-weight: 500;
}

.msg-underweight { background: rgba(59, 130, 246, 0.08); color: #1e40af; border: 1px solid rgba(59, 130, 246, 0.2); }
.msg-normal      { background: rgba(16, 185, 129, 0.08); color: #065f46; border: 1px solid rgba(16, 185, 129, 0.2); }
.msg-overweight  { background: rgba(245, 158, 11, 0.08); color: #92400e; border: 1px solid rgba(245, 158, 11, 0.2); }
.msg-obese       { background: rgba(239, 68, 68, 0.08);  color: #991b1b; border: 1px solid rgba(239, 68, 68, 0.2); }

.dark .msg-underweight { color: #93c5fd; }
.dark .msg-normal      { color: #6ee7b7; }
.dark .msg-overweight  { color: #fcd34d; }
.dark .msg-obese       { color: #fca5a5; }

.weight-diff {
  padding: 0.875rem 1rem;
  border-radius: 10px;
  font-size: 0.875rem;
  font-weight: 600;
  background: var(--muted);
  color: var(--foreground);
  text-align: center;
  line-height: 1.5;
}

/* ─────────────────────────────────────────────
   BMI Table
   ───────────────────────────────────────────── */
.table-card { padding: 1.75rem; }

.table-wrapper { overflow-x: auto; }

.bmi-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

.bmi-table th {
  padding: 0.75rem 1rem;
  text-align: left;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--muted-foreground);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  border-bottom: 1px solid var(--border);
  background: var(--muted);
}

.bmi-table th:first-child { border-radius: 8px 0 0 8px; }
.bmi-table th:last-child  { border-radius: 0 8px 8px 0; }

.table-row td {
  padding: 0.875rem 1rem;
  border-bottom: 1px solid var(--border);
  color: var(--foreground);
  vertical-align: middle;
}

.table-row:last-child td { border-bottom: none; }

.table-row { transition: background var(--transition); }
.table-row:hover td { background: var(--muted); }

.table-row.highlighted td {
  background: rgba(99, 102, 241, 0.06);
  border-color: rgba(99, 102, 241, 0.15);
}

.category-dot {
  display: inline-block;
  width: 8px; height: 8px;
  border-radius: 50%;
  margin-right: 0.5rem;
}

.risk-badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.03em;
}

.risk-low       { background: rgba(16,185,129,0.12); color: #10b981; }
.risk-moderate  { background: rgba(59,130,246,0.12); color: #3b82f6; }
.risk-elevated  { background: rgba(245,158,11,0.12); color: #f59e0b; }
.risk-high      { background: rgba(249,115,22,0.12); color: #f97316; }
.risk-very-high { background: rgba(239,68,68,0.12);  color: #ef4444; }
.risk-extreme   { background: rgba(159,18,57,0.12);  color: #be185d; }

/* ─────────────────────────────────────────────
   About Section
   ───────────────────────────────────────────── */
.about-section {
  padding: 5rem 0;
  background: var(--muted);
  transition: background var(--transition);
}

.section-header {
  text-align: center;
  margin-bottom: 3rem;
}

.section-badge {
  display: inline-block;
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.2);
  color: var(--brand-primary);
  font-size: 0.8rem;
  font-weight: 700;
  padding: 0.3rem 0.875rem;
  border-radius: 100px;
  margin-bottom: 1rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.section-title-lg {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--foreground);
  margin-bottom: 0.75rem;
}

.section-description {
  font-size: 1rem;
  color: var(--muted-foreground);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.7;
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
  margin-bottom: 2.5rem;
}

.info-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.5rem;
  transition: all var(--transition);
  box-shadow: var(--shadow-sm);
}

.info-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.info-icon {
  width: 48px; height: 48px;
  border-radius: 12px;
  background: rgba(var(--icon-color, #6366f1), 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
  color: var(--icon-color, var(--brand-primary));
}

/* Workaround: use data-color or direct style */
.info-card:nth-child(1) .info-icon { background: rgba(99,102,241,0.1); color: #6366f1; }
.info-card:nth-child(2) .info-icon { background: rgba(16,185,129,0.1); color: #10b981; }
.info-card:nth-child(3) .info-icon { background: rgba(245,158,11,0.1); color: #f59e0b; }
.info-card:nth-child(4) .info-icon { background: rgba(236,72,153,0.1); color: #ec4899; }

.info-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--foreground);
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
}

.info-text {
  font-size: 0.875rem;
  color: var(--muted-foreground);
  line-height: 1.65;
}

/* Formula */
.formula-section {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2rem;
  box-shadow: var(--shadow-sm);
}

.formula-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--foreground);
  margin-bottom: 1.25rem;
  text-align: center;
  letter-spacing: -0.02em;
}

.formula-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

@media (max-width: 600px) { .formula-cards { grid-template-columns: 1fr; } }

.formula-card {
  background: var(--muted);
  border-radius: 12px;
  padding: 1.25rem;
  text-align: center;
  border: 1px solid var(--border);
}

.formula-label {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--brand-primary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.875rem;
}

.formula-eq {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-size: 1rem;
  font-weight: 700;
  color: var(--foreground);
  flex-wrap: wrap;
}

.formula-frac {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  border-top: 2px solid var(--foreground);
  padding-top: 3px;
  gap: 2px;
}

.formula-num, .formula-den {
  font-size: 0.8rem;
  font-weight: 600;
  white-space: nowrap;
}

/* ─────────────────────────────────────────────
   Chart Section
   ───────────────────────────────────────────── */
.chart-section {
  padding: 5rem 0;
}

.chart-card {
  padding: 2rem;
}

.section-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--foreground);
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
}

.bar-chart-container {
  position: relative;
  margin-bottom: 2rem;
}

.bar-chart-labels {
  display: flex;
  justify-content: space-between;
  padding: 0 0 0.5rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--muted-foreground);
}

.bar-chart {
  display: flex;
  height: 64px;
  border-radius: 12px;
  overflow: hidden;
  gap: 3px;
}

.bar-segment {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  min-width: 0;
  transition: flex 0.5s ease;
}

.bar-label {
  font-size: 0.7rem;
  font-weight: 700;
  color: #fff;
  text-align: center;
  line-height: 1.3;
  padding: 0 0.5rem;
  text-shadow: 0 1px 4px rgba(0,0,0,0.3);
  white-space: nowrap;
}

@media (max-width: 600px) { .bar-label { font-size: 0.6rem; padding: 0 0.25rem; } }

.bmi-marker {
  position: absolute;
  top: 24px;
  width: 2px;
  background: var(--foreground);
  height: 64px;
  transform: translateX(-50%);
  transition: left 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.bmi-marker-line {
  width: 2px;
  height: 100%;
  background: var(--foreground);
  box-shadow: 0 0 6px rgba(0,0,0,0.3);
}

.bmi-marker-label {
  position: absolute;
  bottom: -22px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.7rem;
  font-weight: 800;
  color: var(--foreground);
  white-space: nowrap;
  background: var(--foreground);
  color: var(--background);
  padding: 1px 6px;
  border-radius: 4px;
}

.chart-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--muted-foreground);
}

.legend-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

/* ─────────────────────────────────────────────
   FAQ Section
   ───────────────────────────────────────────── */
.faq-section {
  padding: 5rem 0;
  background: var(--muted);
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  max-width: 760px;
  margin: 0 auto;
}

.faq-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  transition: box-shadow var(--transition);
}

.faq-item:hover { box-shadow: var(--shadow-sm); }

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.125rem 1.25rem;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--foreground);
  font-family: var(--font-sans);
  text-align: left;
  gap: 1rem;
  transition: color var(--transition);
}

.faq-question:hover { color: var(--brand-primary); }

.faq-arrow {
  flex-shrink: 0;
  color: var(--muted-foreground);
  transition: transform var(--transition);
}

.faq-question[aria-expanded="true"] .faq-arrow {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1), padding 0.35s;
}

.faq-answer.open {
  max-height: 300px;
  padding: 0 1.25rem 1.25rem;
}

.faq-answer p {
  font-size: 0.9rem;
  color: var(--muted-foreground);
  line-height: 1.7;
}

/* ─────────────────────────────────────────────
   Footer
   ───────────────────────────────────────────── */
.site-footer {
  padding: 3rem 0;
  border-top: 1px solid var(--border);
  background: var(--card);
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  text-align: center;
}

.footer-disclaimer {
  font-size: 0.8125rem;
  color: var(--muted-foreground);
  max-width: 480px;
  line-height: 1.6;
}

.footer-copy {
  font-size: 0.8rem;
  color: var(--muted-foreground);
  opacity: 0.7;
}

/* ─────────────────────────────────────────────
   Utilities
   ───────────────────────────────────────────── */
.hidden { display: none !important; }

/* Fade-in animation */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

.fade-in-up {
  animation: fadeInUp 0.45s cubic-bezier(0.4, 0, 0.2, 1) both;
}

/* Pulse for result */
@keyframes pulse-scale {
  0%, 100% { transform: scale(1); }
  50%       { transform: scale(1.03); }
}

/* Scrollbar */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--muted); }
::-webkit-scrollbar-thumb { background: var(--ring); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--muted-foreground); }

/* ─────────────────────────────────────────────
   Calories Nav Link (accent)
   ───────────────────────────────────────────── */
.nav-link-calories {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background: rgba(99, 102, 241, 0.08);
  border: 1px solid rgba(99, 102, 241, 0.2);
  color: var(--brand-primary) !important;
  font-weight: 600 !important;
  padding: 0.35rem 0.875rem !important;
}

.nav-link-calories:hover {
  background: rgba(99, 102, 241, 0.15) !important;
  color: var(--brand-primary) !important;
}

/* ─────────────────────────────────────────────
   Post-BMI Calories CTA Card
   ───────────────────────────────────────────── */
@keyframes ctaSlideIn {
  from { opacity: 0; transform: translateY(12px) scale(0.98); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

.calories-cta {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  padding: 0.875rem 1rem;
  background: linear-gradient(135deg, rgba(99,102,241,0.08) 0%, rgba(139,92,246,0.08) 100%);
  border: 1.5px solid rgba(99,102,241,0.25);
  border-radius: 12px;
  animation: ctaSlideIn 0.5s 0.3s cubic-bezier(0.34, 1.56, 0.64, 1) both;
  transition: border-color var(--transition), background var(--transition);
}

.calories-cta:hover {
  border-color: rgba(99,102,241,0.45);
  background: linear-gradient(135deg, rgba(99,102,241,0.12) 0%, rgba(139,92,246,0.12) 100%);
}

.cta-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: var(--brand-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  flex-shrink: 0;
}

.cta-body { flex: 1; min-width: 0; }

.cta-title {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--foreground);
  margin-bottom: 0.15rem;
}

.cta-sub {
  font-size: 0.775rem;
  color: var(--muted-foreground);
  line-height: 1.4;
}

.cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.5rem 0.875rem;
  background: var(--brand-gradient);
  color: #fff;
  text-decoration: none;
  border-radius: 8px;
  font-size: 0.8125rem;
  font-weight: 700;
  white-space: nowrap;
  transition: all var(--transition);
  box-shadow: 0 4px 12px rgba(99,102,241,0.3);
  flex-shrink: 0;
}

.cta-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(99,102,241,0.45);
}

/* ─────────────────────────────────────────────
   Footer Nav
   ───────────────────────────────────────────── */
.footer-nav {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  justify-content: center;
}

.footer-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--muted-foreground);
  text-decoration: none;
  transition: color var(--transition);
}

.footer-link:hover { color: var(--brand-primary); }

/* ─────────────────────────────────────────────
   Calories Page – Hero (orange theme)
   ───────────────────────────────────────────── */
.hero-orb-cal-1 {
  width: 400px; height: 400px;
  background: radial-gradient(circle, #f97316, transparent 70%);
  top: -100px; left: -100px;
  animation-delay: 0s;
}
.hero-orb-cal-2 {
  width: 350px; height: 350px;
  background: radial-gradient(circle, #ef4444, transparent 70%);
  top: -50px; right: -80px;
  animation-delay: -3s;
}
.hero-orb-cal-3 {
  width: 300px; height: 300px;
  background: radial-gradient(circle, #f59e0b, transparent 70%);
  bottom: -80px; left: 50%;
  transform: translateX(-50%);
  animation-delay: -5s;
}
.hero-gradient-cal {
  background: linear-gradient(135deg, #f97316 0%, #ef4444 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-badge-cal {
  background: rgba(249, 115, 22, 0.1);
  border: 1px solid rgba(249, 115, 22, 0.2);
  color: #f97316;
}
.brand-cal { --brand-primary: #f97316; --brand-secondary: #ef4444; --brand-gradient: linear-gradient(135deg,#f97316,#ef4444); --shadow-brand: 0 8px 32px rgba(249,115,22,0.3); }

/* ─────────────────────────────────────────────
   Calories – Pre-fill Notice
   ───────────────────────────────────────────── */
.prefill-notice {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  background: rgba(16, 185, 129, 0.08);
  border: 1px solid rgba(16, 185, 129, 0.2);
  border-radius: 10px;
  margin-bottom: 1.5rem;
  font-size: 0.8375rem;
  color: #065f46;
  font-weight: 500;
}
.dark .prefill-notice { color: #6ee7b7; }
.prefill-notice svg { color: #10b981; flex-shrink: 0; }

/* ─────────────────────────────────────────────
   Calories – Activity / Goal Selectors
   ───────────────────────────────────────────── */
.activity-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.5rem;
}

.activity-option input[type="radio"] { display: none; }

.activity-card {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  cursor: pointer;
  transition: all var(--transition);
  background: var(--background);
}

.activity-card:hover {
  border-color: #f97316;
  background: rgba(249,115,22,0.04);
}

.activity-option input:checked + .activity-card {
  border-color: #f97316;
  background: rgba(249,115,22,0.06);
  box-shadow: 0 0 0 3px rgba(249,115,22,0.12);
}

.activity-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  border: 2px solid var(--border);
  flex-shrink: 0;
  transition: all var(--transition);
}

.activity-option input:checked + .activity-card .activity-dot {
  border-color: #f97316;
  background: #f97316;
  box-shadow: 0 0 0 3px rgba(249,115,22,0.2);
}

.activity-text { flex: 1; }
.activity-name { font-size: 0.875rem; font-weight: 600; color: var(--foreground); }
.activity-desc { font-size: 0.775rem; color: var(--muted-foreground); line-height: 1.3; margin-top: 0.1rem; }
.activity-mult { font-size: 0.8rem; font-weight: 700; color: #f97316; flex-shrink: 0; }

/* Goal selector */
.goal-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
}

@media (max-width: 480px) { .goal-grid { grid-template-columns: 1fr; } }

.goal-option input[type="radio"] { display: none; }

.goal-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
  padding: 0.875rem 0.5rem;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  cursor: pointer;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--muted-foreground);
  transition: all var(--transition);
  background: var(--background);
  text-align: center;
  line-height: 1.3;
}

.goal-card:hover { border-color: #f97316; color: #f97316; background: rgba(249,115,22,0.04); }
.goal-option input:checked + .goal-card { border-color: #f97316; background: rgba(249,115,22,0.08); color: #f97316; box-shadow: 0 0 0 3px rgba(249,115,22,0.12); }
.goal-emoji { font-size: 1.25rem; }

/* ─────────────────────────────────────────────
   Calories – Result Cards
   ───────────────────────────────────────────── */
.cal-result-section {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.tdee-hero {
  text-align: center;
  padding: 1.75rem;
  background: linear-gradient(135deg, rgba(249,115,22,0.08), rgba(239,68,68,0.08));
  border-radius: 14px;
  border: 1px solid rgba(249,115,22,0.2);
}

.tdee-label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #f97316;
  margin-bottom: 0.5rem;
}

.tdee-value {
  font-size: 3rem;
  font-weight: 900;
  letter-spacing: -0.06em;
  background: linear-gradient(135deg, #f97316, #ef4444);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 0.25rem;
}

.tdee-unit {
  font-size: 0.875rem;
  color: var(--muted-foreground);
  font-weight: 500;
}

/* Goal cards strip */
.goal-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 0.75rem;
}

.goal-strip-card {
  border-radius: 12px;
  padding: 1rem;
  text-align: center;
  border: 1px solid var(--border);
  transition: all var(--transition);
}

.goal-strip-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-sm); }
.goal-strip-card.active-goal { border-color: #f97316; box-shadow: 0 0 0 3px rgba(249,115,22,0.12); }

.goal-strip-label { font-size: 0.7rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.07em; color: var(--muted-foreground); margin-bottom: 0.35rem; }
.goal-strip-kcal { font-size: 1.25rem; font-weight: 800; color: var(--foreground); letter-spacing: -0.03em; }
.goal-strip-desc { font-size: 0.7rem; color: var(--muted-foreground); margin-top: 0.2rem; line-height: 1.3; }

/* Macro ring chart */
.macro-section { display: flex; flex-direction: column; gap: 0.75rem; }
.macro-title { font-size: 0.875rem; font-weight: 700; color: var(--foreground); }
.macro-bars { display: flex; flex-direction: column; gap: 0.6rem; }

.macro-row { display: flex; align-items: center; gap: 0.75rem; }
.macro-name { font-size: 0.8125rem; font-weight: 600; color: var(--foreground); width: 60px; flex-shrink: 0; }
.macro-bar-track { flex: 1; height: 8px; background: var(--muted); border-radius: 4px; overflow: hidden; }
.macro-bar-fill { height: 100%; border-radius: 4px; transition: width 0.8s cubic-bezier(0.4, 0, 0.2, 1); width: 0; }
.macro-bar-fill.protein { background: linear-gradient(90deg, #6366f1, #8b5cf6); }
.macro-bar-fill.carbs   { background: linear-gradient(90deg, #f97316, #f59e0b); }
.macro-bar-fill.fat     { background: linear-gradient(90deg, #10b981, #34d399); }
.macro-grams { font-size: 0.8rem; font-weight: 700; color: var(--foreground); width: 50px; text-align: right; flex-shrink: 0; }
.macro-pct   { font-size: 0.75rem; color: var(--muted-foreground); width: 32px; flex-shrink: 0; }

/* BMR info */
.bmr-info {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.875rem 1rem;
  background: var(--muted);
  border-radius: 10px;
  font-size: 0.875rem;
}
.bmr-info-label { color: var(--muted-foreground); font-weight: 500; }
.bmr-info-value { font-weight: 700; color: var(--foreground); }

/* Calories calc button */
.cal-calc-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.875rem 2rem;
  background: linear-gradient(135deg, #f97316, #ef4444);
  color: #fff;
  border: none;
  border-radius: 12px;
  font-size: 1rem;
  font-weight: 700;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: all var(--transition);
  box-shadow: 0 8px 24px rgba(249,115,22,0.3);
  margin-top: 0.5rem;
}
.cal-calc-btn:hover { transform: translateY(-1px); box-shadow: 0 12px 32px rgba(249,115,22,0.45); }
.cal-calc-btn:active { transform: translateY(0); }

/* Back to BMI link */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--muted-foreground);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  transition: color var(--transition);
  padding: 0.5rem 0;
}
.back-link:hover { color: var(--foreground); }

/* Calories result placeholder */
.cal-placeholder {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  min-height: 340px;
  text-align: center;
}

.cal-placeholder-icon {
  width: 80px; height: 80px;
  border-radius: 20px;
  background: rgba(249,115,22,0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #f97316;
  font-size: 2.5rem;
}
/* Cal result card wrapper */
.cal-result-card { padding: 2rem; display: flex; flex-direction: column; }

/* ─────────────────────────────────────────────
   Scroll-Reveal Animation System
   ───────────────────────────────────────────── */
.scroll-reveal {
  opacity: 0;
  transform: translateY(28px);
  transition:
    opacity  0.65s cubic-bezier(0.4, 0, 0.2, 1) var(--reveal-delay, 0s),
    transform 0.65s cubic-bezier(0.34, 1.4, 0.64, 1) var(--reveal-delay, 0s);
}

.scroll-reveal.in-view {
  opacity: 1;
  transform: translateY(0);
}

/* Respect reduced-motion preference */
@media (prefers-reduced-motion: reduce) {
  .scroll-reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ─────────────────────────────────────────────
   Calories Page – Compact Header (no hero)
   ───────────────────────────────────────────── */
.cal-page-header {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  margin-bottom: 1.75rem;
  padding: 1.25rem 1.5rem;
  background: linear-gradient(135deg, rgba(249,115,22,0.06), rgba(239,68,68,0.06));
  border: 1px solid rgba(249,115,22,0.15);
  border-radius: 14px;
  flex-wrap: wrap;
}

.cal-page-title-block {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  flex-wrap: wrap;
}

.cal-page-title {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--foreground);
  line-height: 1.15;
  margin: 0;
}

/* ─────────────────────────────────────────────
   BMI Page – Compact Header (no hero)
   ───────────────────────────────────────────── */
.bmi-page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  margin-bottom: 1.75rem;
  padding: 1.25rem 1.5rem;
  background: linear-gradient(135deg, rgba(99,102,241,0.06), rgba(139,92,246,0.06));
  border: 1px solid rgba(99,102,241,0.15);
  border-radius: 14px;
  flex-wrap: wrap;
}

.bmi-page-title-block {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  flex-wrap: wrap;
}

.bmi-page-title {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--foreground);
  line-height: 1.15;
  margin: 0;
}

.bmi-page-sub {
  font-size: 0.875rem;
  color: var(--muted-foreground);
  line-height: 1.5;
  max-width: 340px;
  margin: 0;
  text-align: right;
}

@media (max-width: 640px) {
  .bmi-page-sub { text-align: left; max-width: 100%; }
  .bmi-page-header { justify-content: flex-start; }
}

/* ─────────────────────────────────────────────
   SEO Article Guide Section
   ───────────────────────────────────────────── */
.seo-guide-section {
  padding: 5rem 0;
  background: var(--card);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition), border-color var(--transition);
}

.seo-article-main {
  max-width: 820px;
  margin: 0 auto;
}

.seo-article-main h2 {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 800;
  color: var(--foreground);
  margin-bottom: 1.5rem;
  letter-spacing: -0.03em;
  line-height: 1.2;
}

.seo-article-main h3 {
  font-size: clamp(1.2rem, 3vw, 1.4rem);
  font-weight: 700;
  color: var(--foreground);
  margin-top: 2.75rem;
  margin-bottom: 1.15rem;
  letter-spacing: -0.02em;
  line-height: 1.3;
}

.seo-article-main p {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--muted-foreground);
  margin-bottom: 1.5rem;
}

.seo-article-main ul {
  margin-bottom: 1.75rem;
  padding-left: 1.5rem;
  list-style-type: square;
}

.seo-article-main li {
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--muted-foreground);
  margin-bottom: 0.75rem;
}

.seo-article-main li strong {
  color: var(--foreground);
}

.seo-article-main strong {
  color: var(--foreground);
  font-weight: 600;
}

/* ─────────────────────────────────────────────
   Error Pages (404 / 500) Custom Theme
   ───────────────────────────────────────────── */
.error-section {
  padding: 2rem 0;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}

.error-gif-box {
  background-image: url('https://cdn.dribbble.com/users/285475/screenshots/2083086/dribbble_1.gif');
  height: 400px;
  background-position: center;
  background-repeat: no-repeat;
  background-size: contain;
  position: relative;
  border-radius: 16px;
  margin-bottom: 2rem;
}

@media (max-width: 768px) {
  .error-gif-box { height: 320px; }
}

@media (max-width: 480px) {
  .error-gif-box { height: 240px; }
}

.error-code-title {
  text-align: center;
  color: #1c1917; /* Dark slate text forflashlight contrast */
  font-size: clamp(5rem, 15vw, 7.5rem);
  font-weight: 900;
  padding-top: 1.5rem;
  margin: 0;
}

.error-content-box {
  margin-top: -40px;
  text-align: center;
}

.error-title-text {
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 800;
  color: var(--foreground);
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
}

.error-desc-text {
  font-size: 1rem;
  color: var(--muted-foreground);
  margin-bottom: 1.5rem;
}

/* Keep Dribbble gif background white in dark mode for a seamless blend */
.dark .error-gif-box {
  background-color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.15);
}

/* ─────────────────────────────────────────────
   Responsive Overrides
   ───────────────────────────────────────────── */
@media (max-width: 768px) {
  .logo {
    margin-right: auto;
  }
  
  .header-inner {
    gap: 0.5rem;
    position: relative; /* for absolute nav dropdown */
  }

  .mobile-menu-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--card);
    color: var(--foreground);
    cursor: pointer;
    transition: all var(--transition);
    flex-shrink: 0;
  }
  .mobile-menu-toggle:hover {
    background: var(--muted);
  }

  .header-nav {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--card);
    border-bottom: 1px solid var(--border);
    padding: 1.25rem 1.5rem;
    gap: 0.5rem;
    box-shadow: var(--shadow-lg);
    z-index: 99;
  }

  .site-header.mobile-nav-active .header-nav {
    display: flex;
    animation: slideDown 0.25s cubic-bezier(0.4, 0, 0.2, 1) both;
  }

  .site-header.mobile-nav-active .mobile-menu-toggle .line-top {
    transform: translateY(6px) rotate(45deg);
  }
  .site-header.mobile-nav-active .mobile-menu-toggle .line-mid {
    opacity: 0;
  }
  .site-header.mobile-nav-active .mobile-menu-toggle .line-bot {
    transform: translateY(-6px) rotate(-45deg);
  }

  .nav-link {
    width: 100%;
    padding: 0.6rem 1rem;
    font-size: 0.9375rem;
  }

  /* Make sure Calories active cta matches layout width */
  .calories-cta {
    flex-direction: column;
    align-items: stretch;
    text-align: center;
    gap: 0.75rem;
    padding: 1.25rem 1rem;
  }
  .cta-icon {
    margin: 0 auto;
  }
  .cta-btn {
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .calc-card, .result-card, .cal-result-card, .table-card {
    padding: 1.25rem !important;
  }
  .hero {
    padding: 3.5rem 1rem 2.5rem;
  }
  .container {
    padding: 0 1rem;
  }
  .bmi-page-header, .cal-page-header {
    padding: 1rem;
    border-radius: 10px;
  }
  /* Goal selector for Calories page stacks better on small mobile */
  .goal-grid {
    grid-template-columns: 1fr 1fr;
  }
  /* Stats grid stacks better on narrow mobile */
  .stats-grid {
    grid-template-columns: 1fr;
  }
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-10px); }
  to   { opacity: 1; transform: translateY(0); }
}