/* ===================================
   Metal Fabric - Liquid Glass Design System
   Implementing Aether Philosophy with glass morphism
   =================================== */

/* ============= CSS Variables ============= */
:root {
  /* Primary Colors */
  --primary: #00d4ff;
  --secondary: #0ea5e9;
  --accent: #06b6d4;
  
  /* Background Colors */
  --bg-dark: #0a0e1a;
  --bg-darker: #050810;
  --bg-card: rgba(255, 255, 255, 0.03);
  
  /* Glass Effect */
  --glass-bg: rgba(255, 255, 255, 0.08);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-shadow: rgba(0, 212, 255, 0.2);
  
  /* Border Radius (Liquid Glass Standard) */
  --border-radius-2xl: 1rem;
  --border-radius-full: 9999px;
  
  /* Transitions */
  --transition: cubic-bezier(0.4, 0.0, 0.2, 1);
  --transition-fast: 200ms var(--transition);
  --transition-medium: 300ms var(--transition);
  --transition-slow: 500ms var(--transition);
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;
  
  /* Typography */
  --font-sans: system-ui, -apple-system, 'Segoe UI', 'Roboto', 'Helvetica', 'Arial', sans-serif;
  --font-mono: 'SF Mono', 'Monaco', 'Cascadia Code', 'Roboto Mono', monospace;
}

/* ============= Base Styles ============= */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background: linear-gradient(135deg, var(--bg-darker) 0%, var(--bg-dark) 50%, #0d1424 100%);
  background-attachment: fixed;
  color: #e5e7eb;
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
}

/* ============= Glass Effect Components ============= */
.glass-nav {
  background: rgba(10, 14, 26, 0.7);
  backdrop-filter: blur(20px) saturate(180%) brightness(110%);
  -webkit-backdrop-filter: blur(20px) saturate(180%) brightness(110%);
  border: 1px solid var(--glass-border);
  border-radius: var(--border-radius-2xl);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  transition: all var(--transition-medium);
}

.glass-nav.scrolled {
  background: rgba(10, 14, 26, 0.9);
  box-shadow: 0 8px 32px rgba(0, 212, 255, 0.2);
}

.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(10px) saturate(180%) brightness(110%);
  -webkit-backdrop-filter: blur(10px) saturate(180%) brightness(110%);
  border: 1px solid var(--glass-border);
  border-radius: var(--border-radius-2xl);
  padding: var(--spacing-md);
  transition: all var(--transition-medium);
  position: relative;
  overflow: hidden;
}

.glass-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 50% 0%, rgba(0, 212, 255, 0.1), transparent 70%);
  opacity: 0;
  transition: opacity var(--transition-medium);
  pointer-events: none;
}

.glass-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 40px var(--glass-shadow);
  border-color: rgba(0, 212, 255, 0.3);
}

.glass-card:hover::before {
  opacity: 1;
}

/* Fallback for browsers without backdrop-filter support */
@supports not (backdrop-filter: blur(10px)) {
  .glass-card {
    background: rgba(255, 255, 255, 0.15);
  }
  
  .glass-nav {
    background: rgba(10, 14, 26, 0.95);
  }
}

/* ============= Navigation ============= */
nav {
  position: fixed;
  top: 1rem;
  left: 50%;
  transform: translateX(-50%);
  width: calc(100% - 2rem);
  max-width: 1200px;
  z-index: 1000;
  padding: 1rem 2rem;
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
  text-decoration: none;
  letter-spacing: -0.5px;
}

.nav-menu {
  display: flex;
  gap: 2rem;
  list-style: none;
  align-items: center;
}

.nav-link {
  color: #e5e7eb;
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-fast);
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: width var(--transition-fast);
}

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

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 0.25rem;
  background: none;
  border: none;
  cursor: pointer;
}

.hamburger span {
  width: 1.5rem;
  height: 2px;
  background: var(--primary);
  border-radius: var(--border-radius-full);
  transition: all var(--transition-fast);
}

/* ============= Buttons ============= */
.btn {
  display: inline-block;
  padding: 0.875rem 2rem;
  border-radius: var(--border-radius-2xl);
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition-fast);
  border: none;
  cursor: pointer;
  font-size: 1rem;
  font-family: var(--font-sans);
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: #0a0e1a;
  box-shadow: 0 4px 20px rgba(0, 212, 255, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 212, 255, 0.5);
}

.btn-secondary {
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  color: var(--primary);
  border: 1px solid var(--glass-border);
}

.btn-secondary:hover {
  background: rgba(0, 212, 255, 0.1);
  border-color: var(--primary);
}

/* ============= Layout ============= */
.section {
  padding: var(--spacing-xl) var(--spacing-md);
  max-width: 1400px;
  margin: 0 auto;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* ============= Hero Section ============= */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding-top: 6rem;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(0, 212, 255, 0.1) 0%, transparent 70%);
  animation: gradientShift 15s ease-in-out infinite;
}

.hero-content {
  position: relative;
  z-index: 1;
  animation: fadeInUp 1s var(--transition);
}

.hero h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 800;
  background: linear-gradient(135deg, #ffffff 0%, var(--primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 1.5rem;
  line-height: 1.1;
}

.hero p {
  font-size: clamp(1.125rem, 2vw, 1.5rem);
  color: #9ca3af;
  margin-bottom: 2.5rem;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ============= Grid Layouts ============= */
.grid {
  display: grid;
  gap: var(--spacing-md);
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

/* ============= Typography ============= */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  color: #ffffff;
}

h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: var(--spacing-md);
}

h3 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin-bottom: var(--spacing-sm);
}

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

.text-gradient {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ============= Form Styles ============= */
.form-group {
  margin-bottom: 1.5rem;
}

.form-label {
  display: block;
  margin-bottom: 0.5rem;
  color: #d1d5db;
  font-weight: 500;
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: 0.875rem 1.25rem;
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: var(--border-radius-2xl);
  color: #e5e7eb;
  font-size: 1rem;
  font-family: var(--font-sans);
  transition: all var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.1);
}

.form-textarea {
  resize: vertical;
  min-height: 150px;
}

.form-error {
  color: #ef4444;
  font-size: 0.875rem;
  margin-top: 0.25rem;
  display: none;
}

.form-error.active {
  display: block;
}

.form-success {
  background: rgba(34, 197, 94, 0.1);
  border: 1px solid rgba(34, 197, 94, 0.3);
  color: #22c55e;
  padding: 1rem;
  border-radius: var(--border-radius-2xl);
  margin-top: 1rem;
  display: none;
}

.form-success.active {
  display: block;
}

/* ============= Icons ============= */
.icon {
  width: 3rem;
  height: 3rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--glass-bg);
  border-radius: var(--border-radius-2xl);
  margin-bottom: 1rem;
  font-size: 1.5rem;
  color: var(--primary);
}

/* ============= Footer ============= */
footer {
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border-top: 1px solid var(--glass-border);
  padding: var(--spacing-lg) var(--spacing-md);
  margin-top: var(--spacing-xl);
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 2rem;
}

.footer-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.footer-link {
  color: #9ca3af;
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

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

@keyframes gradientShift {
  0%, 100% {
    transform: translate(0, 0) scale(1);
  }
  50% {
    transform: translate(10%, 10%) scale(1.1);
  }
}

@keyframes glow {
  0%, 100% {
    box-shadow: 0 0 20px rgba(0, 212, 255, 0.3);
  }
  50% {
    box-shadow: 0 0 40px rgba(0, 212, 255, 0.5);
  }
}

.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.8s var(--transition);
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============= Responsive Design ============= */
@media (max-width: 1023px) {
  :root {
    --spacing-xl: 4rem;
    --spacing-lg: 3rem;
  }
  
  nav {
    width: calc(100% - 1rem);
    padding: 0.75rem 1.5rem;
  }
}

@media (max-width: 768px) {
  .hamburger {
    display: flex;
  }
  
  .nav-menu {
    position: absolute;
    top: calc(100% + 1rem);
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(10, 14, 26, 0.95);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius-2xl);
    padding: 1.5rem;
    gap: 1rem;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-fast);
  }
  
  .nav-menu.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }
  
  .section {
    padding: var(--spacing-lg) var(--spacing-sm);
  }
  
  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }
  
  .btn {
    width: 100%;
    max-width: 300px;
    text-align: center;
  }
  
  .footer-content {
    flex-direction: column;
    text-align: center;
  }
  
  .footer-links {
    flex-direction: column;
    gap: 1rem;
  }
}

@media (max-width: 639px) {
  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }
  
  :root {
    --spacing-md: 1.5rem;
  }
}

/* ============= Utility Classes ============= */
.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }

.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }

.rounded-full {
  border-radius: var(--border-radius-full);
}

.rounded-2xl {
  border-radius: var(--border-radius-2xl);
}