/* OMM Minerals - TKHNU Design System 
   "Precision in Space" Implementation */

/* ========================================
   1. CSS VARIABLES & DESIGN TOKENS
   ======================================== */

:root {
  /* Spatial Scale (Mobile-First) */
  --space-xs: 0.5rem;   /* 8px */
  --space-sm: 1rem;     /* 16px */
  --space-md: 2rem;     /* 32px */
  --space-lg: 4rem;     /* 64px */
  --space-xl: 6rem;     /* 96px */
  --space-2xl: 8rem;    /* 128px */
  
  /* Typography Scale (Mobile-First) */
  --text-xs: 0.75rem;     /* 12px - metadata */
  --text-sm: 0.875rem;    /* 14px - secondary text */
  --text-base: 1rem;      /* 16px - body */
  --text-lg: 1.125rem;    /* 18px - large body */
  --text-xl: 1.5rem;      /* 24px - h3 */
  --text-2xl: 2rem;       /* 32px - h2 */
  --text-3xl: 2.5rem;     /* 40px - h1 mobile */
  --text-4xl: 3rem;       /* 48px - hero mobile */
  
  /* Universal Neutrals */
  --color-black: #0A0A0A;
  --color-grey-900: #1A1A1A;
  --color-grey-800: #2A2A2A;
  --color-grey-700: #404040;
  --color-grey-500: #6B6B6B;
  --color-grey-300: #B3B3B3;
  --color-grey-100: #E8E8E8;
  --color-white: #FAFAFA;
  --color-warm-white: #F5F3F0;
  
  /* OMM Specific Colors */
  --color-primary: #2C2418;      /* Geological grey */
  --color-accent: #D4763B;       /* Rust/amber - earth tones */
  --color-accent-dim: #A65F30;   /* Dimmed accent */
  --color-logo: #c0a36a;         /* Logo gold */
  
  /* Transitions */
  --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 600ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Desktop Enhancements */
@media (min-width: 768px) {
  :root {
    --text-3xl: 3.5rem;   /* 56px - h1 desktop */
    --text-4xl: 4.5rem;   /* 72px - hero desktop */
    --text-5xl: 6rem;     /* 96px - statement pieces */
  }
}

/* ========================================
   2. RESET & BASE STYLES
   ======================================== */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  line-height: 1.5;
  color: var(--color-grey-900);
  background-color: var(--color-warm-white);
  overflow-x: hidden;
}

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

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition-base);
}

button {
  border: none;
  background: none;
  cursor: pointer;
  font-family: inherit;
}

/* ========================================
   3. TYPOGRAPHY SYSTEM
   ======================================== */

.display-heading {
  font-size: var(--text-4xl);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  font-weight: 300;
  line-height: 1.1;
  color: var(--color-primary);
}

.section-heading {
  font-size: var(--text-3xl);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-weight: 400;
  line-height: 1.2;
  color: var(--color-grey-900);
}

.subheading {
  font-size: var(--text-xl);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-weight: 500;
  color: var(--color-grey-700);
}

.body-text {
  font-size: var(--text-base);
  letter-spacing: 0.01em;
  line-height: 1.6;
  color: var(--color-grey-700);
}

.caption {
  font-size: var(--text-sm);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-grey-500);
}

/* Desktop Typography Scale */
@media (min-width: 768px) {
  .display-heading {
    font-size: var(--text-5xl);
  }
}

/* ========================================
   4. LAYOUT & CONTAINERS
   ======================================== */

.container {
  width: 100%;
  padding-inline: var(--space-md);
  padding-block: var(--space-lg);
  margin: 0 auto;
}

.section {
  padding-block: var(--space-xl);
}

.section--dark {
  background-color: var(--color-grey-900);
  color: var(--color-grey-100);
}

.section--dark .body-text {
  color: var(--color-grey-300);
}

.section--dark .section-heading {
  color: var(--color-grey-100);
}

@media (min-width: 768px) {
  .container {
    padding-inline: var(--space-xl);
    padding-block: var(--space-2xl);
    max-width: 1400px;
  }
  
  .section {
    padding-block: var(--space-2xl);
  }
}

/* Asymmetric Grid */
.grid {
  display: grid;
  gap: var(--space-md);
}

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

@media (min-width: 768px) {
  .grid--asymmetric {
    grid-template-columns: 2fr 1fr;
  }
  
  .grid--asymmetric-reverse {
    grid-template-columns: 1fr 2fr;
  }
}

/* ========================================
   5. NAVIGATION
   ======================================== */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(44, 36, 24, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: var(--transition-base);
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-sm) var(--space-md);
}

.logo {
  height: 48px;
  width: auto;
}

.logo svg {
  height: 100%;
  width: auto;
}

.menu-toggle {
  width: 44px;
  height: 44px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  padding: 10px;
}

.menu-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-logo);
  transition: var(--transition-base);
}

.menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Menu Overlay */
.nav-menu {
  position: fixed;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100vh;
  background: var(--color-primary);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  transition: var(--transition-base);
}

.nav-menu.active {
  left: 0;
}

.nav-menu ul {
  list-style: none;
  text-align: center;
}

.nav-menu li {
  margin: var(--space-md) 0;
}

.nav-menu a {
  color: var(--color-grey-100);
  font-size: var(--text-xl);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-weight: 300;
  position: relative;
}

.nav-menu a::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: var(--transition-base);
}

.nav-menu a:hover::after {
  width: 100%;
}

/* Desktop Navigation */
@media (min-width: 1024px) {
  .menu-toggle {
    display: none;
  }
  
  .nav-menu {
    position: static;
    width: auto;
    height: auto;
    background: transparent;
    flex-direction: row;
    left: 0;
  }
  
  .nav-menu ul {
    display: flex;
    gap: var(--space-lg);
  }
  
  .nav-menu li {
    margin: 0;
  }
  
  .nav-menu a {
    font-size: var(--text-base);
  }
}

/* ========================================
   6. HERO SECTION
   ======================================== */

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-grey-900) 100%);
  overflow: hidden;
}

.hero-content {
  text-align: center;
  z-index: 2;
  padding: var(--space-xl) var(--space-md);
}

.hero .display-heading {
  color: var(--color-grey-100);
  margin-bottom: var(--space-md);
  opacity: 0;
  animation: fadeInUp 1s ease forwards;
}

.hero-subtitle {
  font-size: var(--text-lg);
  color: var(--color-accent);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: var(--space-lg);
  opacity: 0;
  animation: fadeInUp 1s ease 0.2s forwards;
}

.hero-description {
  font-size: var(--text-base);
  color: var(--color-grey-300);
  max-width: 600px;
  margin: 0 auto var(--space-lg);
  opacity: 0;
  animation: fadeInUp 1s ease 0.4s forwards;
}

/* Geological Pattern Background */
.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 
    repeating-linear-gradient(
      45deg,
      transparent,
      transparent 35px,
      rgba(212, 118, 59, 0.03) 35px,
      rgba(212, 118, 59, 0.03) 70px
    );
  z-index: 1;
}

/* ========================================
   7. BUTTONS & CTA
   ======================================== */

.btn {
  display: inline-block;
  min-height: 48px;
  padding: 14px 32px;
  font-size: var(--text-base);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-weight: 500;
  transition: var(--transition-base);
  cursor: pointer;
  border: 2px solid transparent;
}

.btn--primary {
  background: var(--color-accent);
  color: var(--color-white);
  border-color: var(--color-accent);
}

.btn--primary:hover {
  background: var(--color-accent-dim);
  border-color: var(--color-accent-dim);
  transform: translateY(-2px);
}

.btn--outline {
  background: transparent;
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.btn--outline:hover {
  background: var(--color-accent);
  color: var(--color-white);
}

/* ========================================
   8. DATA DISPLAY
   ======================================== */

.data-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-lg);
  margin-top: var(--space-xl);
}

.data-card {
  text-align: center;
  padding: var(--space-md);
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(212, 118, 59, 0.2);
  transition: var(--transition-base);
}

.data-card:hover {
  transform: translateY(-5px);
  border-color: var(--color-accent);
  background: rgba(212, 118, 59, 0.1);
}

.data-value {
  font-size: var(--text-4xl);
  font-weight: 300;
  letter-spacing: 0.05em;
  color: var(--color-accent);
  line-height: 1;
}

.data-label {
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-grey-500);
  margin-top: var(--space-xs);
}

/* ========================================
   9. SERVICE CARDS
   ======================================== */

.services-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
  margin-top: var(--space-xl);
}

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

.service-card {
  padding: var(--space-lg);
  background: var(--color-white);
  border: 1px solid var(--color-grey-100);
  transition: var(--transition-base);
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--color-accent);
  transform: translateX(-100%);
  transition: var(--transition-base);
}

.service-card:hover::before {
  transform: translateX(0);
}

.service-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

.service-icon {
  width: 60px;
  height: 60px;
  margin-bottom: var(--space-md);
  fill: var(--color-accent);
}

.service-title {
  font-size: var(--text-xl);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: var(--space-sm);
  color: var(--color-primary);
}

/* ========================================
   10. MAP SECTION
   ======================================== */

.map-container {
  position: relative;
  height: 600px;
  background: var(--color-grey-900);
  overflow: hidden;
  margin-top: var(--space-xl);
}

.map-overlay {
  position: absolute;
  top: var(--space-md);
  left: var(--space-md);
  right: var(--space-md);
  padding: var(--space-md);
  background: rgba(44, 36, 24, 0.9);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: var(--color-grey-100);
  z-index: 10;
}

@media (min-width: 768px) {
  .map-overlay {
    width: 400px;
    right: auto;
  }
}

/* ========================================
   11. FOOTER
   ======================================== */

.footer {
  background: var(--color-primary);
  color: var(--color-grey-100);
  padding: var(--space-xl) 0 var(--space-lg);
  margin-top: var(--space-2xl);
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

@media (min-width: 768px) {
  .footer-content {
    grid-template-columns: 2fr 1fr 1fr 1fr;
  }
}

.footer-brand {
  margin-bottom: var(--space-md);
}

.footer-logo {
  height: 60px;
  margin-bottom: var(--space-sm);
}

.footer-tagline {
  font-size: var(--text-sm);
  color: var(--color-grey-500);
  letter-spacing: 0.05em;
}

.footer-links h4 {
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
}

.footer-links ul {
  list-style: none;
}

.footer-links li {
  margin-bottom: var(--space-xs);
}

.footer-links a {
  color: var(--color-grey-300);
  font-size: var(--text-sm);
  transition: var(--transition-base);
}

.footer-links a:hover {
  color: var(--color-accent);
}

.footer-bottom {
  margin-top: var(--space-lg);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-grey-800);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
}

@media (min-width: 768px) {
  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
  }
}

/* ========================================
   12. ANIMATIONS
   ======================================== */

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.fade-in-up {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.8s ease;
}

.fade-in-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ========================================
   13. UTILITIES
   ======================================== */

.text-center {
  text-align: center;
}

.text-accent {
  color: var(--color-accent);
}

.mt-md {
  margin-top: var(--space-md);
}

.mt-lg {
  margin-top: var(--space-lg);
}

.mb-md {
  margin-bottom: var(--space-md);
}

.mb-lg {
  margin-bottom: var(--space-lg);
}

/* Loading States */
.skeleton {
  background: linear-gradient(90deg, 
    var(--color-grey-100) 25%, 
    var(--color-grey-300) 50%, 
    var(--color-grey-100) 75%
  );
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s ease infinite;
}

@keyframes skeleton-loading {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

/* Accessibility */
.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;
}

/* Focus States */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}