@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&display=swap');

/**
 * ArmyFitnessTestCalculator.com - Main Stylesheet
 * Premium Dark Mode Tactical Design System (WCAG 2.1 AA Compliant)
 */

:root {
  /* Tactical Color Palette - Modern Premium Dark Mode */
  --color-primary-dark: #0A0F0B;
  --color-primary: #1E2D20;
  --color-primary-light: #2C3E2E;
  --color-primary-subtle: rgba(255, 184, 0, 0.08);
  
  --color-accent-gold: #FFB800;
  --color-accent-gold-dark: #E6A600;
  --color-accent-gold-light: rgba(255, 184, 0, 0.12);
  --color-accent-gold-border: rgba(255, 184, 0, 0.3);

  /* Score Tier Colors (Dark Mode High Contrast) */
  --tier-fail: #FF4D4D;
  --tier-fail-bg: rgba(255, 77, 77, 0.12);
  --tier-fail-border: rgba(255, 77, 77, 0.3);

  --tier-pass: #FFB800;
  --tier-pass-bg: rgba(255, 184, 0, 0.12);
  --tier-pass-border: rgba(255, 184, 0, 0.3);

  --tier-combat: #22C55E;
  --tier-combat-bg: rgba(34, 197, 94, 0.12);
  --tier-combat-border: rgba(34, 197, 94, 0.3);

  --tier-max: #3B82F6;
  --tier-max-bg: rgba(59, 130, 246, 0.12);
  --tier-max-border: rgba(59, 130, 246, 0.3);

  /* Premium Dark Neutral Tones */
  --bg-body: #121212;
  --bg-card: #1E1E1E;
  --bg-surface-alt: #252525;
  --bg-input: #2A2A2A;
  
  --text-main: #F5F5F5;
  --text-muted: #A0A0A0;
  --text-light: #707070;
  --text-inverse: #121212;
  
  --border-color: #333333;
  --border-focus: #FFB800;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 12px 28px rgba(0, 0, 0, 0.6);
  --shadow-tactical: 0 8px 24px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(255, 184, 0, 0.1);

  /* Spacing Scale (8px base) */
  --space-1: 0.25rem;  /* 4px */
  --space-2: 0.5rem;   /* 8px */
  --space-3: 0.75rem;  /* 12px */
  --space-4: 1rem;     /* 16px */
  --space-5: 1.25rem;  /* 20px */
  --space-6: 1.5rem;   /* 24px */
  --space-8: 2rem;     /* 32px */
  --space-10: 2.5rem;  /* 40px */
  --space-12: 3rem;    /* 48px */
  --space-16: 4rem;    /* 64px */

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  /* Border Radii */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  /* Container */
  --container-max-w: 1200px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  color-scheme: dark;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-body);
  color: var(--text-main);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Custom Scrollbar for Dark Theme */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: #181818;
}

::-webkit-scrollbar-thumb {
  background: #333333;
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-accent-gold);
}

img, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: var(--color-accent-gold);
  text-decoration: none;
  transition: color 0.15s ease-in-out, opacity 0.15s ease-in-out;
}

a:hover {
  color: #FFD04D;
  text-decoration: none;
}

a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible {
  outline: 2px solid var(--color-accent-gold);
  outline-offset: 2px;
}

/* Layout Utilities */
.container {
  width: 100%;
  max-width: var(--container-max-w);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

.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;
}

/* Top Tactical Banner */
.tactical-disclaimer-banner {
  background-color: #0A0F0B;
  color: var(--text-muted);
  font-size: 0.78125rem;
  padding: var(--space-2) 0;
  border-bottom: 1px solid rgba(255, 184, 0, 0.15);
  text-align: center;
}

.tactical-disclaimer-banner strong {
  color: var(--color-accent-gold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Header & Navigation */
.site-header {
  background-color: #181818;
  border-bottom: 1px solid #2A2A2A;
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: var(--shadow-sm);
}

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  font-weight: 800;
  color: var(--text-main);
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.brand-logo svg {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
}

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

.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  list-style: none;
}

.nav-item {
  position: relative;
}

.nav-link {
  color: var(--text-main);
  font-weight: 600;
  font-size: 0.9375rem;
  padding: var(--space-2) var(--space-1);
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link:hover, .nav-link.active {
  color: var(--color-accent-gold);
}

/* Hero Section */
.hero-section {
  background: linear-gradient(180deg, #181818 0%, var(--bg-body) 100%);
  padding: 24px 0 28px;
  border-bottom: 1px solid var(--border-color);
}

.hero-header {
  text-align: center;
  max-width: 960px;
  margin: 0 auto 22px;
}

.badge-status {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  background-color: var(--color-accent-gold-light);
  border: 1px solid var(--color-accent-gold-border);
  color: var(--color-accent-gold);
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: var(--space-3);
}

.badge-status::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  background-color: var(--tier-combat);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--tier-combat);
}

.hero-title {
  font-size: 2.25rem;
  font-weight: 800;
  color: #FFFFFF;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-top: 0;
  margin-bottom: 10px;
}

.hero-subtitle {
  font-size: 1.05rem;
  line-height: 1.5;
  color: var(--text-muted);
  max-width: 940px;
  margin: 0 auto;
}

/* Master & Standalone Calculator Shell */
.calculator-card {
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-tactical);
  overflow: hidden;
  margin-bottom: var(--space-12);
  padding: 28px;
}

.calculator-card:has(.calc-header-bar),
.calculator-card.has-header-bar {
  padding: 0;
}

.calc-header-bar {
  background-color: #181818;
  color: var(--text-main);
  padding: var(--space-4) var(--space-6);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  border-bottom: 2px solid var(--color-accent-gold);
}

.calc-title {
  font-size: 1.25rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: #FFFFFF;
}

/* Toggle Tabs for Standard */
.standard-toggle-group {
  display: inline-flex;
  background-color: #121212;
  padding: 4px;
  border-radius: var(--radius-md);
  border: 1px solid #333333;
}

.toggle-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 0.8125rem;
  font-weight: 600;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s ease;
}

.toggle-btn.active {
  background-color: var(--color-accent-gold);
  color: #121212;
  font-weight: 800;
  box-shadow: 0 2px 8px rgba(255, 184, 0, 0.3);
}

/* Calculator Grid */
.calc-grid {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 0;
}

@media (max-width: 1024px) {
  .calc-grid {
    grid-template-columns: 1fr;
  }
}

.calc-inputs-pane {
  padding: var(--space-6);
  background: var(--bg-card);
}

/* Demographics Controls Bar */
.demographics-bar {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-4);
  padding: var(--space-4);
  background: var(--bg-surface-alt);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  margin-bottom: var(--space-6);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.form-label {
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-main);
}

.form-select, .form-input {
  width: 100%;
  height: 44px;
  padding: 0 var(--space-3);
  font-size: 0.9375rem;
  font-family: inherit;
  color: var(--text-main);
  background-color: var(--bg-input);
  border: 1px solid #444444;
  border-radius: var(--radius-sm);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.form-select:focus, .form-input:focus {
  border-color: var(--color-accent-gold);
  box-shadow: 0 0 0 3px rgba(255, 184, 0, 0.2);
  outline: none;
}

/* Gender Pills */
.gender-pill-group {
  display: flex;
  gap: var(--space-2);
  height: 44px;
}

.gender-pill-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--bg-input);
  border: 1px solid #444444;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.875rem;
  cursor: pointer;
  color: var(--text-muted);
  transition: all 0.15s ease;
}

.gender-pill-btn.active {
  background-color: var(--color-accent-gold);
  border-color: var(--color-accent-gold);
  color: #121212;
  font-weight: 800;
}

/* Buttons System */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 12px 24px;
  font-weight: 700;
  font-size: 0.9375rem;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all 0.2s ease-in-out;
  text-decoration: none;
  font-family: inherit;
  line-height: 1.2;
}

.btn-primary, .btn-gold {
  background-color: var(--color-accent-gold);
  color: #121212;
  font-weight: 800;
  box-shadow: 0 4px 12px rgba(255, 184, 0, 0.25);
}

.btn-primary:hover, .btn-gold:hover {
  background-color: #FFC42E;
  color: #121212;
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(255, 184, 0, 0.35);
}

.btn-secondary, .btn-outline {
  background: transparent;
  border: 1px solid #444444;
  color: var(--text-main);
}

.btn-secondary:hover, .btn-outline:hover {
  background: #2A2A2A;
  border-color: var(--color-accent-gold);
  color: var(--color-accent-gold);
  transform: translateY(-2px);
}

.btn-outline-danger {
  background: transparent;
  border: 1px solid rgba(255, 77, 77, 0.4);
  color: #FF4D4D;
}

.btn-outline-danger:hover {
  background: rgba(255, 77, 77, 0.15);
  border-color: #FF4D4D;
  transform: translateY(-2px);
}

/* Hub Grid Sections */
.section {
  padding: var(--space-12) 0;
}

.section-alt {
  background-color: var(--bg-surface-alt);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.section-header {
  text-align: center;
  max-width: 780px;
  margin: 0 auto var(--space-8);
}

.section-title {
  font-size: 1.875rem;
  font-weight: 800;
  color: #FFFFFF;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-2);
}

.section-subtitle {
  color: var(--text-muted);
  font-size: 1rem;
}

.grid-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-6);
}

.hub-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
  text-decoration: none;
  color: inherit;
}

.hub-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-accent-gold);
}

.hub-icon-wrapper {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--color-accent-gold-light);
  color: var(--color-accent-gold);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-4);
  font-size: 1.25rem;
}

.hub-card-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: var(--space-2);
}

.hub-card-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  flex-grow: 1;
  margin-bottom: var(--space-4);
}

.hub-card-link {
  font-weight: 700;
  font-size: 0.875rem;
  color: var(--color-accent-gold);
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
}

/* Reference Tables - Dark Theme */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-md);
  margin-bottom: var(--space-6);
}

.tactical-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.875rem;
}

.tactical-table th {
  background-color: #181818;
  color: var(--color-accent-gold);
  font-weight: 800;
  padding: 12px 16px;
  border-bottom: 2px solid var(--color-accent-gold);
  white-space: nowrap;
  text-transform: uppercase;
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
}

.tactical-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-main);
}

.tactical-table tbody tr:nth-child(odd) {
  background-color: #1E1E1E;
}

.tactical-table tbody tr:nth-child(even) {
  background-color: #252525;
}

.tactical-table tbody tr:hover {
  background-color: rgba(255, 184, 0, 0.08);
}

/* FAQ Accordion */
.faq-stack {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  max-width: 860px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  text-align: left;
  padding: var(--space-4) var(--space-5);
  font-weight: 700;
  font-size: 1rem;
  color: #FFFFFF;
  background: none;
  border: none;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-4);
}

.faq-answer {
  padding: 0 var(--space-5) var(--space-5);
  font-size: 0.9375rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* Footer - Dark Theme */
.site-footer {
  background-color: #0A0F0B;
  color: var(--text-muted);
  padding: var(--space-12) 0 var(--space-6);
  margin-top: auto;
  border-top: 2px solid var(--color-accent-gold);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: var(--space-8);
  margin-bottom: var(--space-10);
}

@media (max-width: 900px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

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

.footer-brand h3 {
  color: #FFFFFF;
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: var(--space-3);
}

.footer-brand p {
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--text-muted);
  margin-bottom: var(--space-4);
}

.footer-column h4 {
  color: var(--color-accent-gold);
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-4);
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer-links a {
  color: var(--text-muted);
  font-size: 0.875rem;
}

.footer-links a:hover {
  color: #FFFFFF;
}

.footer-disclaimer-box {
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  font-size: 0.8125rem;
  line-height: 1.5;
  color: var(--text-muted);
  margin-bottom: var(--space-8);
}

.footer-disclaimer-box strong {
  color: var(--color-accent-gold);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  font-size: 0.8125rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: var(--space-6);
  color: var(--text-light);
}

.footer-legal-nav {
  display: flex;
  gap: var(--space-4);
}

.footer-legal-nav a {
  color: var(--text-muted);
}

.footer-legal-nav a:hover {
  color: #FFFFFF;
}

/* Mobile Responsiveness Rules */
@media (max-width: 768px) {
  .main-nav {
    display: none;
  }

  .mobile-nav-toggle {
    display: block;
  }

  .hero-title {
    font-size: 1.875rem;
  }

  .calc-header-bar {
    flex-direction: column;
    align-items: flex-start;
  }
}