/* ==========================================================================
   BodyFatWise - Comprehensive Body Fat & Military Readiness Calculator
   Modern Design System with Fluid Dark & Light Themes
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&family=Outfit:wght@500;600;700;800&display=swap');

:root {
  /* Color Tokens - Dark Mode (Default) */
  --bg-page: #0a0e17;
  --bg-gradient-start: #0a0e17;
  --bg-gradient-end: #111827;
  --bg-card: rgba(17, 24, 39, 0.85);
  --bg-card-hover: rgba(26, 36, 56, 0.9);
  --bg-input: #1e293b;
  --bg-input-focus: #26334a;
  --bg-pill: #1a2234;
  --bg-pill-active: #2563eb;
  
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-focus: #3b82f6;
  --border-active: rgba(59, 130, 246, 0.5);

  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --text-inverse: #0a0e17;

  --accent-primary: #3b82f6;
  --accent-primary-hover: #2563eb;
  --accent-indigo: #6366f1;
  --accent-cyan: #06b6d4;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  --accent-rose: #f43f5e;

  --glow-primary: rgba(59, 130, 246, 0.25);
  --glow-emerald: rgba(16, 185, 129, 0.25);
  --glow-rose: rgba(244, 63, 94, 0.25);

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 10px 25px -5px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 20px 40px -15px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 25px rgba(59, 130, 246, 0.2);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --font-main: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-display: 'Outfit', sans-serif;

  --transition-fast: 0.15s ease;
  --transition-base: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="light"] {
  --bg-page: #f1f5f9;
  --bg-gradient-start: #f8fafc;
  --bg-gradient-end: #e2e8f0;
  --bg-card: rgba(255, 255, 255, 0.95);
  --bg-card-hover: #ffffff;
  --bg-input: #f8fafc;
  --bg-input-focus: #ffffff;
  --bg-pill: #e2e8f0;
  --bg-pill-active: #2563eb;

  --border-subtle: #e2e8f0;
  --border-focus: #2563eb;
  --border-active: rgba(37, 99, 235, 0.4);

  --text-main: #0f172a;
  --text-muted: #475569;
  --text-dim: #94a3b8;
  --text-inverse: #ffffff;

  --accent-primary: #2563eb;
  --accent-primary-hover: #1d4ed8;

  --shadow-sm: 0 2px 6px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 10px 25px -5px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 20px 35px -10px rgba(15, 23, 42, 0.12);
  --shadow-glow: 0 0 25px rgba(37, 99, 235, 0.15);
}

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

html {
  font-family: var(--font-main);
  scroll-behavior: smooth;
  color-scheme: dark light;
}

body {
  background: var(--bg-page);
  background-image: 
    radial-gradient(at 0% 0%, rgba(59, 130, 246, 0.12) 0px, transparent 50%),
    radial-gradient(at 100% 100%, rgba(99, 102, 241, 0.1) 0px, transparent 50%);
  background-attachment: fixed;
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background var(--transition-smooth), color var(--transition-smooth);
}

a {
  color: inherit;
  text-decoration: none;
}

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

/* Layout Container */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(10, 14, 23, 0.75);
  border-bottom: 1px solid var(--border-subtle);
  transition: background var(--transition-base), border-color var(--transition-base);
}

[data-theme="light"] .site-header {
  background: rgba(255, 255, 255, 0.85);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.25rem;
  gap: 1rem;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-main);
  white-space: nowrap;
}

.brand-icon-box {
  width: 2.35rem;
  height: 2.35rem;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-indigo));
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  box-shadow: 0 4px 12px var(--glow-primary);
  flex-shrink: 0;
}

.brand-badge {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: rgba(59, 130, 246, 0.15);
  color: var(--accent-primary);
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-full);
  border: 1px solid rgba(59, 130, 246, 0.25);
  margin-left: 0.25rem;
}

/* Header Actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* ==========================================================================
   Homescreen Calculator Mode Switcher (Prominent & Highly Visible on Mobile)
   ========================================================================== */
.homescreen-calc-switcher {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.85rem;
  max-width: 680px;
  margin: 0 auto 2.25rem;
  padding: 0.4rem;
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.homescreen-switch-btn {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 0.85rem 1.15rem;
  border-radius: var(--radius-md);
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  text-decoration: none;
  transition: all var(--transition-base);
}

.homescreen-switch-btn:hover {
  background: var(--bg-card-hover);
  color: var(--text-main);
  border-color: rgba(59, 130, 246, 0.35);
  transform: translateY(-1px);
}

.homescreen-switch-btn.active {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-indigo));
  color: #ffffff;
  border-color: transparent;
  box-shadow: 0 4px 14px var(--glow-primary);
}

.switch-btn-icon {
  width: 2.35rem;
  height: 2.35rem;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--accent-primary);
  transition: all var(--transition-fast);
}

.homescreen-switch-btn.active .switch-btn-icon {
  background: rgba(255, 255, 255, 0.2);
  color: #ffffff;
}

.switch-btn-text {
  display: flex;
  flex-direction: column;
  text-align: left;
  line-height: 1.25;
}

.switch-btn-text strong {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 700;
}

.switch-btn-text small {
  font-size: 0.75rem;
  opacity: 0.8;
  margin-top: 2px;
}

/* Theme Switcher Button */
.theme-toggle-btn {
  background: var(--bg-pill);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  width: 2.35rem;
  height: 2.35rem;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
}

.theme-toggle-btn:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-active);
  transform: translateY(-1px);
}

.theme-toggle-btn svg {
  width: 1.15rem;
  height: 1.15rem;
  transition: transform var(--transition-fast);
}

.sun-icon { display: none; }
.moon-icon { display: block; }
[data-theme="light"] .sun-icon { display: block; }
[data-theme="light"] .moon-icon { display: none; }

/* Header Action Buttons & Menu Toggle (Available ONLY in mobile version) */
.mobile-nav-toggle {
  display: none;
  background: var(--bg-pill);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  width: 2.35rem;
  height: 2.35rem;
  border-radius: var(--radius-md);
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.mobile-nav-toggle:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-active);
  transform: translateY(-1px);
}

@media (max-width: 768px) {
  .mobile-nav-toggle {
    display: flex;
  }
}

/* ==========================================================================
   Mobile & Compact Drawer Navigation Menu
   (Available ONLY on mobile; strictly hidden by default on all viewports)
   ========================================================================== */
.mobile-nav-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.4);
  padding: 1.25rem 1.5rem;
  z-index: 1000;
  flex-direction: column;
  gap: 0.35rem;
}

[data-theme="light"] .mobile-nav-menu {
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.08);
}

@media (max-width: 768px) {
  .mobile-nav-menu.open {
    display: flex;
    animation: slideDownMenu 0.2s cubic-bezier(0.16, 1, 0.3, 1) forwards;
  }
}

@keyframes slideDownMenu {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.mobile-nav-section-title {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  padding: 0.5rem 0.75rem 0.25rem;
}

.mobile-nav-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 0.85rem;
  border-radius: var(--radius-sm);
  color: var(--text-main);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.mobile-nav-item svg {
  flex-shrink: 0;
  color: var(--accent-primary);
}

.mobile-nav-item:hover,
.mobile-nav-item.active {
  background: var(--bg-input);
  color: var(--accent-primary);
  transform: translateX(3px);
}

.mobile-nav-divider {
  height: 1px;
  background: var(--border-subtle);
  margin: 0.5rem 0;
}

/* ==========================================================================
   Hero & Page Headers
   ========================================================================== */
.hero-section {
  padding: 2.5rem 0 1.5rem;
  text-align: center;
}

.hero-pill-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(59, 130, 246, 0.12);
  border: 1px solid rgba(59, 130, 246, 0.25);
  color: var(--accent-primary);
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 0.85rem;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(1.85rem, 4vw, 2.75rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 0.75rem;
}

.text-gradient {
  background: linear-gradient(135deg, #60a5fa 10%, #a855f7 90%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

[data-theme="light"] .text-gradient {
  background: linear-gradient(135deg, #1d4ed8 10%, #7e22ce 90%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  color: var(--text-muted);
  max-width: 620px;
  margin: 0 auto;
  font-size: 1rem;
}

/* ==========================================================================
   Calculator Workspace Layout (2-Column Grid)
   ========================================================================== */
.calc-grid {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 1.75rem;
  margin-bottom: 3.5rem;
  align-items: start;
}

/* Glass Card */
.glass-card {
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

.glass-card:hover {
  border-color: rgba(59, 130, 246, 0.3);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.35rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-subtle);
  flex-wrap: wrap;
  gap: 0.75rem;
}

.card-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.card-title svg {
  color: var(--accent-primary);
}

/* Control Toggle Groups (Segmented controls) */
.segmented-control {
  display: flex;
  background: var(--bg-input);
  padding: 0.25rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  gap: 0.25rem;
}

.segment-btn {
  flex: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.55rem 0.9rem;
  font-size: 0.85rem;
  font-weight: 600;
  border: none;
  background: transparent;
  color: var(--text-muted);
  border-radius: calc(var(--radius-md) - 3px);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.segment-btn:hover {
  color: var(--text-main);
}

.segment-btn.active {
  background: var(--accent-primary);
  color: #ffffff;
  box-shadow: 0 2px 8px var(--glow-primary);
}

/* Form Groups & Inputs */
.form-section {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.form-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.label-hint {
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--text-dim);
}

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

.input-field {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.75rem 2.75rem 0.75rem 1rem;
  font-size: 0.975rem;
  font-weight: 500;
  color: var(--text-main);
  transition: all var(--transition-fast);
  appearance: none;
  -webkit-appearance: none;
}

.input-field:focus {
  outline: none;
  border-color: var(--border-focus);
  background: var(--bg-input-focus);
  box-shadow: 0 0 0 3px var(--glow-primary);
}

.input-unit {
  position: absolute;
  right: 0.95rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-dim);
  pointer-events: none;
  text-transform: uppercase;
}

/* Custom Select Dropdowns */
.select-field {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.75rem 2rem 0.75rem 1rem;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-main);
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.85rem center;
}

.select-field:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--glow-primary);
}

/* Action Buttons */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-indigo));
  color: #ffffff;
  padding: 0.85rem 1.5rem;
  border-radius: var(--radius-md);
  font-weight: 700;
  font-size: 0.95rem;
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  box-shadow: 0 4px 14px var(--glow-primary);
  width: 100%;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px var(--glow-primary);
  filter: brightness(1.05);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: var(--bg-input);
  color: var(--text-muted);
  padding: 0.65rem 1rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.85rem;
  border: 1px solid var(--border-subtle);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-secondary:hover {
  color: var(--text-main);
  border-color: var(--border-focus);
}

/* ==========================================================================
   Results & Visual Gauge Display
   ========================================================================== */
.results-card {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.gauge-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  padding: 1rem 0;
}

.gauge-svg {
  width: 240px;
  height: 140px;
  overflow: visible;
}

.gauge-bg-path {
  fill: none;
  stroke: var(--bg-input);
  stroke-width: 16;
  stroke-linecap: round;
}

.gauge-fill-path {
  fill: none;
  stroke: url(#gaugeGradient);
  stroke-width: 16;
  stroke-linecap: round;
  transition: stroke-dashoffset 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.gauge-center-text {
  text-align: center;
  margin-top: -3.5rem;
}

.gauge-percentage {
  font-family: var(--font-display);
  font-size: 2.85rem;
  font-weight: 800;
  line-height: 1;
  color: var(--text-main);
  letter-spacing: -0.03em;
}

.gauge-percentage span {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent-primary);
  margin-left: 2px;
}

.gauge-status-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 700;
  margin-top: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.badge-essential { background: rgba(59, 130, 246, 0.15); color: #60a5fa; border: 1px solid rgba(59, 130, 246, 0.3); }
.badge-athletes  { background: rgba(6, 182, 212, 0.15); color: #22d3ee; border: 1px solid rgba(6, 182, 212, 0.3); }
.badge-fitness   { background: rgba(16, 185, 129, 0.15); color: #34d399; border: 1px solid rgba(16, 185, 129, 0.3); }
.badge-average   { background: rgba(245, 158, 11, 0.15); color: #fbbf24; border: 1px solid rgba(245, 158, 11, 0.3); }
.badge-obese     { background: rgba(244, 63, 94, 0.15); color: #fb7185; border: 1px solid rgba(244, 63, 94, 0.3); }

/* Military Compliance Badge */
.military-status-card {
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  border: 1px solid var(--border-subtle);
  background: var(--bg-input);
}

.military-status-card.status-pass {
  background: rgba(16, 185, 129, 0.1);
  border-color: rgba(16, 185, 129, 0.3);
}

.military-status-card.status-fail {
  background: rgba(244, 63, 94, 0.1);
  border-color: rgba(244, 63, 94, 0.3);
}

.military-status-title {
  font-weight: 700;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.military-status-sub {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.status-indicator-pill {
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  font-weight: 800;
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  flex-shrink: 0;
}

.status-pass .status-indicator-pill {
  background: var(--accent-emerald);
  color: white;
  box-shadow: 0 2px 10px var(--glow-emerald);
}

.status-fail .status-indicator-pill {
  background: var(--accent-rose);
  color: white;
  box-shadow: 0 2px 10px var(--glow-rose);
}

/* Metrics Mini Cards Grid */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.85rem;
}

.metric-card {
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.95rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.metric-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.metric-val {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-main);
}

.metric-sub {
  font-size: 0.75rem;
  color: var(--text-dim);
}

/* Body Fat Category Scale Bar */
.category-scale-wrap {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.scale-label-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
}

.scale-bar-track {
  height: 10px;
  border-radius: var(--radius-full);
  display: flex;
  overflow: hidden;
  background: var(--bg-input);
}

.scale-seg {
  height: 100%;
  transition: opacity var(--transition-fast);
}

.scale-seg.seg-essential { flex: 6; background: #3b82f6; }
.scale-seg.seg-athletes  { flex: 8; background: #06b6d4; }
.scale-seg.seg-fitness   { flex: 8; background: #10b981; }
.scale-seg.seg-average   { flex: 10; background: #f59e0b; }
.scale-seg.seg-obese     { flex: 12; background: #f43f5e; }

.scale-legend {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem 0.25rem;
  font-size: 0.7rem;
  color: var(--text-dim);
}

.legend-dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  margin-right: 4px;
}

/* ==========================================================================
   Instruction & Guide Section
   ========================================================================== */
.guide-section {
  margin-bottom: 3.5rem;
}

.guide-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-top: 1.25rem;
}

.guide-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.35rem;
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.guide-icon {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: var(--radius-sm);
  background: rgba(59, 130, 246, 0.15);
  color: var(--accent-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.guide-body h4 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.guide-body p {
  font-size: 0.825rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ==========================================================================
   Content Pages Styling (About, Terms, Privacy, Contact)
   ========================================================================== */
.content-page-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  margin-bottom: 3.5rem;
  box-shadow: var(--shadow-md);
}

.article-content {
  max-width: 860px;
  margin: 0 auto;
}

.article-header {
  text-align: center;
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-subtle);
}

.article-title {
  font-family: var(--font-display);
  font-size: clamp(1.85rem, 3.5vw, 2.5rem);
  font-weight: 800;
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}

.article-meta {
  color: var(--text-dim);
  font-size: 0.875rem;
}

.article-section {
  margin-bottom: 2.25rem;
}

.article-section h2 {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 0.85rem;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.article-section h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 1.25rem 0 0.5rem;
  color: var(--text-main);
}

.article-section p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 0.95rem;
  line-height: 1.7;
}

.article-section ul {
  padding-left: 1.25rem;
  margin-bottom: 1rem;
  color: var(--text-muted);
}

.article-section li {
  margin-bottom: 0.4rem;
  font-size: 0.925rem;
}

.info-callout {
  background: rgba(59, 130, 246, 0.08);
  border-left: 4px solid var(--accent-primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 1.15rem 1.35rem;
  margin: 1.35rem 0;
}

.info-callout p {
  margin-bottom: 0;
  color: var(--text-main);
  font-size: 0.9rem;
}

/* Contact Page Specific Components */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.35fr;
  gap: 2rem;
  align-items: start;
}

.contact-info-panel {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.contact-card-item {
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.contact-card-icon {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-indigo));
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.contact-card-body h4 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.contact-card-body p {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.direct-mail-action {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--accent-primary);
  transition: gap var(--transition-fast);
}

.direct-mail-action:hover {
  text-decoration: underline;
  gap: 0.6rem;
}

/* ==========================================================================
   Footer Section (All About, Terms, Privacy, Contact Links Here)
   ========================================================================== */
.site-footer {
  margin-top: auto;
  background: var(--bg-card);
  border-top: 1px solid var(--border-subtle);
  padding: 3.5rem 0 2rem;
  transition: background var(--transition-base), border-color var(--transition-base);
}

.footer-top {
  display: grid;
  grid-template-columns: 1.75fr 1fr 1fr;
  gap: 2.5rem;
  margin-bottom: 2.5rem;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.footer-brand-desc {
  color: var(--text-muted);
  font-size: 0.875rem;
  line-height: 1.6;
  max-width: 360px;
}

.footer-direct-mail-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(59, 130, 246, 0.12);
  border: 1px solid rgba(59, 130, 246, 0.25);
  color: var(--accent-primary);
  padding: 0.45rem 0.95rem;
  border-radius: var(--radius-full);
  font-size: 0.825rem;
  font-weight: 600;
  width: fit-content;
  transition: all var(--transition-fast);
}

.footer-direct-mail-chip:hover {
  background: var(--accent-primary);
  color: white;
  transform: translateY(-1px);
}

.footer-col-title {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1.25rem;
}

.footer-links-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-link {
  font-size: 0.875rem;
  color: var(--text-muted);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: color var(--transition-fast), transform var(--transition-fast);
}

.footer-link:hover {
  color: var(--accent-primary);
  transform: translateX(3px);
}

.footer-link.active {
  color: var(--accent-primary);
  font-weight: 600;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 2rem;
  border-top: 1px solid var(--border-subtle);
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.8rem;
  color: var(--text-dim);
}

.footer-disclaimer-text {
  max-width: 700px;
  line-height: 1.5;
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 992px) {
  .calc-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .contact-grid {
    grid-template-columns: 1fr;
  }

  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .header-inner {
    height: 3.75rem;
  }

  .mobile-nav-toggle {
    display: inline-flex;
  }

  /* Homescreen Calculator Mode Switcher Responsive */
  .homescreen-calc-switcher {
    grid-template-columns: 1fr;
    gap: 0.65rem;
    margin-bottom: 1.75rem;
    padding: 0.35rem;
  }

  .homescreen-switch-btn {
    padding: 0.75rem 1rem;
  }

  /* Mobile Drawer Menu */
  .mobile-nav-menu {
    position: fixed;
    top: 3.75rem;
    left: 0;
    right: 0;
    background: var(--bg-card);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border-bottom: 1px solid var(--border-subtle);
    padding: 1.25rem 1rem;
    display: none;
    flex-direction: column;
    gap: 0.45rem;
    box-shadow: var(--shadow-lg);
    z-index: 99;
    max-height: calc(100vh - 3.75rem);
    overflow-y: auto;
  }

  .mobile-nav-menu.open {
    display: flex;
  }

  .mobile-nav-section-title {
    font-size: 0.75rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-dim);
    margin: 0.65rem 0 0.25rem 0.5rem;
  }

  .mobile-nav-divider {
    height: 1px;
    background: var(--border-subtle);
    margin: 0.5rem 0;
  }

  .mobile-nav-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.925rem;
    color: var(--text-muted);
    background: var(--bg-input);
    transition: all var(--transition-fast);
  }

  .mobile-nav-item:hover, .mobile-nav-item:focus {
    color: var(--text-main);
    background: var(--bg-card-hover);
  }

  .mobile-nav-item.active {
    background: var(--accent-primary);
    color: white;
    box-shadow: 0 2px 10px var(--glow-primary);
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .footer-top {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

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

  .glass-card {
    padding: 1.25rem;
  }

  .content-page-card {
    padding: 1.5rem;
  }

  .hero-section {
    padding: 1.75rem 0 1rem;
  }
}

/* ==========================================================================
   SEO Content & FAQ Accordion Section
   ========================================================================== */
.seo-content-section {
  margin-bottom: 3.5rem;
}

.seo-article-card {
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: var(--shadow-md);
  line-height: 1.75;
}

.seo-article-card h2 {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 800;
  margin: 1.75rem 0 0.85rem;
  color: var(--text-main);
  letter-spacing: -0.02em;
}

.seo-article-card h2:first-of-type {
  margin-top: 0;
}

.seo-article-card h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  margin: 1.25rem 0 0.5rem;
  color: var(--text-main);
}

.seo-article-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 1.15rem;
}

.seo-article-card ul, .seo-article-card ol {
  padding-left: 1.5rem;
  margin-bottom: 1.25rem;
  color: var(--text-muted);
}

.seo-article-card li {
  margin-bottom: 0.5rem;
  font-size: 0.925rem;
}

.formula-box {
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.15rem 1.35rem;
  margin: 1rem 0 1.5rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.9rem;
  color: var(--accent-primary);
  line-height: 1.6;
}

/* FAQ Accordion */
.faq-section {
  margin-bottom: 3.5rem;
}

.faq-header {
  text-align: center;
  margin-bottom: 2rem;
}

.faq-grid {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition-fast);
}

.faq-item:hover {
  border-color: rgba(59, 130, 246, 0.4);
}

.faq-question {
  width: 100%;
  padding: 1.15rem 1.35rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  background: transparent;
  border: none;
  cursor: pointer;
  text-align: left;
  gap: 1rem;
}

.faq-icon {
  width: 1.25rem;
  height: 1.25rem;
  color: var(--accent-primary);
  transition: transform var(--transition-fast);
  flex-shrink: 0;
}

.faq-item.open .faq-icon {
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 1.35rem 1.25rem;
  font-size: 0.925rem;
  color: var(--text-muted);
  line-height: 1.65;
  display: none;
}

.faq-item.open .faq-answer {
  display: block;
}

/* ==========================================================================
   Uplifting & Motivational Insight Card
   ========================================================================== */
.uplifting-message-card {
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.08), rgba(99, 102, 241, 0.08));
  border: 1px solid rgba(59, 130, 246, 0.22);
  border-radius: var(--radius-md);
  padding: 1.15rem 1.25rem;
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  transition: all var(--transition-base);
}

.uplifting-icon-box {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, #10b981, #06b6d4);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.25);
}

.uplifting-content {
  flex: 1;
}

.uplifting-content h4 {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.25rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.uplifting-text {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.55;
  margin-bottom: 0;
}