/*
 * MERIDIAN DESIGN SYSTEM
 * Mobile-first responsive CSS framework
 * All styles default to mobile, scale up with min-width breakpoints
 */

/* ============================================
   CSS VARIABLES (Design Tokens)
   ============================================ */
:root {
  /* Brand Colors */
  --color-midnight: #0A1628;
  --color-graphite: #3E4651;
  --color-gold: #D4AF37;
  --color-gold-hover: #c9a431;
  --color-gold-dark: #b8972d;
  --color-white: #FAFAFA;
  --color-success: #10B981;
  --color-error: #EF4444;
  
  /* Neutral Colors */
  --color-gray-100: #F5F5F5;
  --color-gray-200: #E5E7EB;
  --color-gray-300: #D1D5DB;
  --color-gray-400: #9CA3AF;
  --color-gray-500: #6B7280;
  --color-gray-600: #4B5563;
  --color-gray-700: #374151;
  --color-gray-800: #1F2937;
  
  /* Spacing Scale (4px 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 */
  --space-20: 5rem;     /* 80px */
  
  /* Typography Scale (fluid) */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.3vw, 1rem);
  --text-base: clamp(1rem, 0.9rem + 0.4vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.5vw, 1.25rem);
  --text-xl: clamp(1.25rem, 1.1rem + 0.6vw, 1.5rem);
  --text-2xl: clamp(1.5rem, 1.2rem + 1vw, 2rem);
  --text-3xl: clamp(1.875rem, 1.4rem + 1.5vw, 2.5rem);
  --text-4xl: clamp(2.25rem, 1.6rem + 2vw, 3rem);
  --text-5xl: clamp(2.5rem, 1.8rem + 2.5vw, 3.5rem);
  
  /* Font Families */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-serif: 'IBM Plex Serif', Georgia, serif;
  --font-mono: 'JetBrains Mono', monospace;
  
  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;
  
  /* Gradients */
  --gradient-premium: linear-gradient(135deg, #0A1628 0%, #1A2B3D 100%);
  
  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;
  
  /* Z-index Scale */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-fixed: 300;
  --z-modal-backdrop: 400;
  --z-modal: 500;
  --z-tooltip: 600;
}

/* ============================================
   RESET & BASE STYLES
   ============================================ */
*, *::before, *::after {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-graphite);
  background-color: var(--color-midnight);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

button {
  font-family: inherit;
  cursor: pointer;
}

/* ============================================
   LAYOUT UTILITIES
   ============================================ */

/* Container - centered with max-width and padding */
.container {
  width: 100%;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

@media (min-width: 768px) {
  .container {
    padding-left: var(--space-6);
    padding-right: var(--space-6);
  }
}

@media (min-width: 1024px) {
  .container {
    padding-left: var(--space-8);
    padding-right: var(--space-8);
  }
}

/* Stack - vertical flex with gap */
.stack {
  display: flex;
  flex-direction: column;
}

.stack-sm { gap: var(--space-2); }
.stack-md { gap: var(--space-4); }
.stack-lg { gap: var(--space-6); }
.stack-xl { gap: var(--space-8); }

/* Row - horizontal flex with gap */
.row {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

@media (min-width: 768px) {
  .row {
    flex-direction: row;
  }
}

.row-center {
  align-items: center;
  justify-content: center;
}

/* Grid - responsive auto-fit grid */
.grid {
  display: grid;
  gap: var(--space-4);
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .grid-2 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 768px) {
  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1024px) {
  .grid-4 {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* Section spacing */
.section {
  padding-top: var(--space-12);
  padding-bottom: var(--space-12);
}

@media (min-width: 768px) {
  .section {
    padding-top: var(--space-16);
    padding-bottom: var(--space-16);
  }
}

/* ============================================
   NAVIGATION
   ============================================ */
.nav {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background-color: var(--color-midnight);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  max-width: 1200px;
  margin: 0 auto;
}

@media (min-width: 768px) {
  .nav-container {
    padding: var(--space-4) var(--space-6);
  }
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.nav-logo img {
  height: 28px;
  width: auto;
}

@media (min-width: 768px) {
  .nav-logo img {
    height: 32px;
  }
}

/* Desktop nav links - hidden on mobile */
.nav-links {
  display: none;
  align-items: center;
  gap: var(--space-6);
}

@media (min-width: 768px) {
  .nav-links {
    display: flex;
  }
}

.nav-link {
  color: var(--color-white);
  font-size: var(--text-sm);
  font-weight: 500;
  transition: color var(--transition-fast);
  white-space: nowrap;
}

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

/* Nav actions (buttons) */
.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

@media (min-width: 768px) {
  .nav-actions {
    gap: var(--space-3);
  }
}

/* Mobile menu toggle */
.nav-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: transparent;
  border: none;
  color: var(--color-white);
  cursor: pointer;
}

@media (min-width: 768px) {
  .nav-toggle {
    display: none;
  }
}

.nav-toggle svg {
  width: 24px;
  height: 24px;
}

/* Mobile menu */
.nav-mobile {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background-color: var(--color-midnight);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  padding: var(--space-4);
}

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

@media (min-width: 768px) {
  .nav-mobile {
    display: none !important;
  }
}

.nav-mobile-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.nav-mobile-link {
  display: block;
  color: var(--color-white);
  font-size: var(--text-base);
  padding: var(--space-3) 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 44px;
  padding: var(--space-3) var(--space-5);
  font-size: var(--text-sm);
  font-weight: 600;
  text-align: center;
  white-space: nowrap;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
}

@media (min-width: 768px) {
  .btn {
    min-height: 48px;
    padding: var(--space-3) var(--space-6);
  }
}

/* Primary button (gold) */
.btn-primary {
  background-color: var(--color-gold);
  color: var(--color-midnight);
  border-color: var(--color-gold);
}

.btn-primary:hover {
  background-color: var(--color-gold-hover);
  border-color: var(--color-gold-hover);
}

/* Secondary button (outline) */
.btn-secondary {
  background-color: transparent;
  color: var(--color-gold);
  border-color: var(--color-gold);
}

.btn-secondary:hover {
  background-color: var(--color-gold);
  color: var(--color-midnight);
}

/* Ghost button (text only) */
.btn-ghost {
  background-color: transparent;
  color: var(--color-white);
  border-color: transparent;
  padding: var(--space-2) var(--space-3);
  min-height: 40px;
}

.btn-ghost:hover {
  color: var(--color-gold);
}

/* Button sizes */
.btn-sm {
  min-height: 36px;
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-xs);
}

.btn-lg {
  min-height: 52px;
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-base);
}

/* Full width button on mobile */
.btn-block {
  width: 100%;
}

@media (min-width: 768px) {
  .btn-block-mobile {
    width: auto;
  }
}

/* ============================================
   CARDS
   ============================================ */
.card {
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  box-shadow: var(--shadow-md);
}

@media (min-width: 768px) {
  .card {
    padding: var(--space-6);
  }
}

.card-dark {
  background-color: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.card-gold {
  background-color: var(--color-gold);
  color: var(--color-midnight);
}

/* ============================================
   FORMS
   ============================================ */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form-label {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-graphite);
}

.form-input {
  width: 100%;
  min-height: 44px;
  padding: var(--space-3) var(--space-4);
  font-size: 16px; /* Prevent iOS zoom */
  font-family: inherit;
  color: var(--color-graphite);
  background-color: var(--color-white);
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus {
  outline: none;
  border-color: var(--color-gold);
  box-shadow: 0 0 0 3px rgba(212, 175, 55, 0.2);
}

.form-input::placeholder {
  color: var(--color-gray-400);
}

/* Dark form input */
.form-input-dark {
  background-color: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
  color: var(--color-white);
}

.form-input-dark::placeholder {
  color: rgba(255, 255, 255, 0.5);
}

/* ============================================
   TYPOGRAPHY
   ============================================ */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-white { color: var(--color-white); }
.text-gold { color: var(--color-gold); }
.text-midnight { color: var(--color-midnight); }
.text-gray { color: var(--color-gray-500); }

.font-bold { font-weight: 700; }
.font-semibold { font-weight: 600; }
.font-medium { font-weight: 500; }
.font-normal { font-weight: 400; }

.font-serif { font-family: var(--font-serif); }

/* Headings */
.heading-1 {
  font-size: var(--text-4xl);
  font-weight: 300;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.heading-2 {
  font-size: var(--text-3xl);
  font-weight: 600;
  line-height: 1.3;
}

.heading-3 {
  font-size: var(--text-2xl);
  font-weight: 600;
  line-height: 1.4;
}

.heading-4 {
  font-size: var(--text-xl);
  font-weight: 600;
  line-height: 1.4;
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
  padding: var(--space-12) 0;
  text-align: center;
}

@media (min-width: 768px) {
  .hero {
    padding: var(--space-20) 0;
  }
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-block;
  padding: var(--space-2) var(--space-4);
  background-color: rgba(212, 175, 55, 0.15);
  border: 1px solid var(--color-gold);
  border-radius: var(--radius-full);
  color: var(--color-gold);
  font-size: var(--text-sm);
  font-weight: 500;
  margin-bottom: var(--space-6);
}

.hero-title {
  font-size: var(--text-4xl);
  font-weight: 300;
  color: var(--color-white);
  margin: 0 0 var(--space-4) 0;
  line-height: 1.2;
}

.hero-title-accent {
  color: var(--color-gold);
  font-family: var(--font-serif);
  font-style: italic;
}

.hero-subtitle {
  font-size: var(--text-lg);
  color: var(--color-gray-400);
  margin: 0 0 var(--space-8) 0;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  align-items: center;
}

@media (min-width: 480px) {
  .hero-actions {
    flex-direction: row;
    justify-content: center;
  }
}

/* ============================================
   BANNER (Top announcement bar)
   ============================================ */
.banner {
  background-color: var(--color-gold);
  color: var(--color-midnight);
  padding: var(--space-2) var(--space-4);
  text-align: center;
  font-size: var(--text-sm);
  font-weight: 500;
}

@media (min-width: 768px) {
  .banner {
    padding: var(--space-3) var(--space-4);
  }
}

/* ============================================
   FEATURE CARDS
   ============================================ */
.features {
  background-color: var(--color-midnight);
}

.feature-card {
  background-color: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  text-align: center;
  transition: transform var(--transition-base), border-color var(--transition-base);
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-gold);
}

.feature-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto var(--space-4);
  color: var(--color-gold);
}

.feature-title {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-white);
  margin: 0 0 var(--space-2) 0;
}

.feature-description {
  font-size: var(--text-sm);
  color: var(--color-gray-400);
  margin: 0;
  line-height: 1.6;
}

/* ============================================
   CTA BOX
   ============================================ */
.cta-box {
  background-color: var(--color-gold);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  text-align: center;
  color: var(--color-midnight);
}

@media (min-width: 768px) {
  .cta-box {
    padding: var(--space-8) var(--space-10);
  }
}

.cta-box-title {
  font-size: var(--text-xl);
  font-weight: 600;
  margin: 0 0 var(--space-2) 0;
}

.cta-box-subtitle {
  font-size: var(--text-base);
  margin: 0 0 var(--space-4) 0;
  opacity: 0.9;
}

.cta-box .btn {
  background-color: var(--color-midnight);
  color: var(--color-white);
  border-color: var(--color-midnight);
}

.cta-box .btn:hover {
  background-color: var(--color-gray-800);
}

/* ============================================
   FLOATING WIDGET
   ============================================ */
.floating-widget {
  position: fixed;
  bottom: var(--space-4);
  right: var(--space-4);
  z-index: var(--z-fixed);
}

@media (min-width: 768px) {
  .floating-widget {
    bottom: var(--space-6);
    right: var(--space-6);
  }
}

.floating-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  background-color: var(--color-gold);
  color: var(--color-midnight);
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-lg);
  border: none;
  cursor: pointer;
  transition: transform var(--transition-fast);
}

.floating-btn:hover {
  transform: scale(1.1);
}

/* ============================================
   UTILITY CLASSES
   ============================================ */

/* Display */
.hidden { display: none; }
.block { display: block; }
.flex { display: flex; }
.inline-flex { display: inline-flex; }

/* Visibility by breakpoint */
.hide-mobile {
  display: none;
}

@media (min-width: 768px) {
  .hide-mobile {
    display: block;
  }
  
  .hide-desktop {
    display: none;
  }
}

/* Spacing utilities */
.mt-0 { margin-top: 0; }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }

.mb-0 { margin-bottom: 0; }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }

.mx-auto { margin-left: auto; margin-right: auto; }

.p-4 { padding: var(--space-4); }
.p-6 { padding: var(--space-6); }
.p-8 { padding: var(--space-8); }

/* Gap */
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }

/* Width */
.w-full { width: 100%; }
.max-w-sm { max-width: 24rem; }
.max-w-md { max-width: 28rem; }
.max-w-lg { max-width: 32rem; }
.max-w-xl { max-width: 36rem; }
.max-w-2xl { max-width: 42rem; }

/* ============================================
   MODAL
   ============================================ */
.modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: var(--z-modal-backdrop);
  background-color: rgba(0, 0, 0, 0.8);
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
}

.modal.active {
  display: flex;
}

.modal-content {
  background-color: var(--color-midnight);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 600px;
  max-height: 90vh;
  overflow-y: auto;
  padding: var(--space-6);
  position: relative;
}

.modal-close {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  color: var(--color-gray-400);
  cursor: pointer;
  font-size: 24px;
}

.modal-close:hover {
  color: var(--color-white);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
  background-color: var(--color-midnight);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: var(--space-8) 0;
  text-align: center;
  color: var(--color-gray-500);
  font-size: var(--text-sm);
}

@media (min-width: 768px) {
  .footer {
    padding: var(--space-12) 0;
  }
}

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

.animate-pulse {
  animation: pulse 2s infinite;
}

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

.animate-fadeIn {
  animation: fadeIn 0.5s ease-out;
}