/* ========================================
   BLANKPHONE - Design System
   "Start Blank. End Brilliant."
   ======================================== */

/* CSS Variables - Design Tokens */
:root {
  /* Brand Colors */
  --color-primary: #0a0a0a;
  --color-secondary: #1a1a1a;
  --color-accent: #00d4ff;
  --color-accent-hover: #00b8e6;
  --color-accent-glow: rgba(0, 212, 255, 0.3);
  
  /* Neutrals */
  --color-white: #ffffff;
  --color-gray-50: #fafafa;
  --color-gray-100: #f5f5f5;
  --color-gray-200: #e5e5e5;
  --color-gray-300: #d4d4d4;
  --color-gray-400: #a3a3a3;
  --color-gray-500: #737373;
  --color-gray-600: #525252;
  --color-gray-700: #404040;
  --color-gray-800: #262626;
  --color-gray-900: #171717;
  
  /* Semantic Colors */
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  --color-info: #3b82f6;
  
  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-display: 'Outfit', var(--font-primary);
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  
  /* Font Sizes */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  --text-6xl: 3.75rem;
  --text-7xl: 4.5rem;
  --text-8xl: 6rem;
  
  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;
  
  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-2xl: 2rem;
  --radius-full: 9999px;
  
  /* 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);
  --shadow-glow: 0 0 40px var(--color-accent-glow);
  
  /* Glassmorphism */
  --glass-bg: rgba(26, 26, 26, 0.8);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-blur: blur(20px);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 300ms ease;
  --transition-slow: 500ms ease;
  --transition-bounce: 500ms cubic-bezier(0.68, -0.55, 0.265, 1.55);
  
  /* Z-index Scale */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-modal: 300;
  --z-tooltip: 400;
}

/* ========================================
   Base Styles
   ======================================== */

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

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

body {
  font-family: var(--font-primary);
  background-color: var(--color-primary);
  color: var(--color-white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

/* Selection */
::selection {
  background: var(--color-accent);
  color: var(--color-primary);
}

/* Links */
a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

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

/* ========================================
   Typography
   ======================================== */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 { font-size: var(--text-6xl); }
h2 { font-size: var(--text-4xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }
h5 { font-size: var(--text-lg); }
h6 { font-size: var(--text-base); }

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

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

.text-muted {
  color: var(--color-gray-400);
}

/* ========================================
   Layout
   ======================================== */

.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.container-sm { max-width: 768px; }
.container-lg { max-width: 1536px; }

.section {
  padding: var(--space-24) 0;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-16);
}

.section-header h2 {
  margin-bottom: var(--space-4);
}

.section-header p {
  color: var(--color-gray-400);
  font-size: var(--text-lg);
  max-width: 600px;
  margin: 0 auto;
}

/* Grid System */
.grid {
  display: grid;
  gap: var(--space-6);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-5 { grid-template-columns: repeat(5, 1fr); }

@media (max-width: 1024px) {
  .grid-4, .grid-5 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .grid-2, .grid-3, .grid-4, .grid-5 { grid-template-columns: 1fr; }
  h1 { font-size: var(--text-4xl); }
  h2 { font-size: var(--text-3xl); }
}

/* Flexbox Utilities */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-end { justify-content: flex-end; }
.gap-2 { gap: var(--space-2); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

/* ========================================
   Navigation
   ======================================== */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  padding: var(--space-4) 0;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--glass-border);
  transition: all var(--transition-base);
}

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

.navbar-logo {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-white);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.navbar-logo span {
  color: var(--color-accent);
}

.navbar-nav {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  list-style: none;
}

.navbar-nav a {
  color: var(--color-gray-300);
  font-size: var(--text-sm);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: color var(--transition-fast);
}

.navbar-nav a:hover,
.navbar-nav a.active {
  color: var(--color-accent);
}

.navbar-cta {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

/* Mobile Menu */
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-white);
  font-size: var(--text-xl);
  cursor: pointer;
}

@media (max-width: 768px) {
  .mobile-toggle { display: block; }
  .navbar-nav, .navbar-cta { display: none; }
  .navbar-nav.active {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    padding: var(--space-6);
    gap: var(--space-4);
  }
}

/* ========================================
   Buttons
   ======================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-primary);
  font-size: var(--text-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
}

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

.btn-primary:hover {
  background: var(--color-accent-hover);
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
  color: var(--color-primary);
}

.btn-secondary {
  background: transparent;
  color: var(--color-white);
  border: 1px solid var(--glass-border);
}

.btn-secondary:hover {
  background: var(--glass-bg);
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.btn-ghost {
  background: transparent;
  color: var(--color-gray-300);
}

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

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

.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-xs);
}

/* ========================================
   Cards
   ======================================== */

.card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: all var(--transition-base);
}

.card:hover {
  transform: translateY(-4px);
  border-color: var(--color-accent);
  box-shadow: var(--shadow-glow);
}

.card-image {
  aspect-ratio: 4/3;
  overflow: hidden;
  background: linear-gradient(135deg, var(--color-gray-800) 0%, var(--color-gray-900) 100%);
}

.card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.card:hover .card-image img {
  transform: scale(1.05);
}

.card-content {
  padding: var(--space-6);
}

.card-title {
  font-size: var(--text-xl);
  margin-bottom: var(--space-2);
}

.card-description {
  color: var(--color-gray-400);
  font-size: var(--text-sm);
  margin-bottom: var(--space-4);
}

.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-4);
  border-top: 1px solid var(--glass-border);
}

/* Product Card */
.product-card {
  position: relative;
}

.product-card .badge {
  position: absolute;
  top: var(--space-4);
  left: var(--space-4);
  z-index: 10;
}

.product-card .price {
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-accent);
}

.product-card .price-label {
  font-size: var(--text-xs);
  color: var(--color-gray-500);
  text-transform: uppercase;
}

/* ========================================
   Badges
   ======================================== */

.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: var(--radius-full);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
}

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

.badge-success {
  background: rgba(16, 185, 129, 0.2);
  color: var(--color-success);
  border-color: var(--color-success);
}

.badge-pro { background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%); color: white; border: none; }
.badge-x { background: linear-gradient(135deg, #ef4444 0%, #f97316 100%); color: white; border: none; }
.badge-one { background: linear-gradient(135deg, #3b82f6 0%, #06b6d4 100%); color: white; border: none; }
.badge-a { background: linear-gradient(135deg, #10b981 0%, #34d399 100%); color: white; border: none; }

/* ========================================
   Hero Section
   ======================================== */

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-32) var(--space-6);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 150%;
  height: 150%;
  background: radial-gradient(circle at center, var(--color-accent-glow) 0%, transparent 60%);
  transform: translate(-50%, -50%);
  opacity: 0.3;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 900px;
}

.hero-badge {
  margin-bottom: var(--space-6);
}

.hero h1 {
  font-size: clamp(var(--text-4xl), 8vw, var(--text-8xl));
  margin-bottom: var(--space-6);
}

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

.hero-actions {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  flex-wrap: wrap;
}

.hero-stats {
  display: flex;
  gap: var(--space-12);
  justify-content: center;
  margin-top: var(--space-16);
  padding-top: var(--space-8);
  border-top: 1px solid var(--glass-border);
}

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

.hero-stat-value {
  font-size: var(--text-4xl);
  font-weight: 700;
  color: var(--color-accent);
}

.hero-stat-label {
  font-size: var(--text-sm);
  color: var(--color-gray-500);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* ========================================
   Features Grid
   ======================================== */

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-6);
}

.feature-card {
  padding: var(--space-8);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  transition: all var(--transition-base);
}

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

.feature-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent);
  color: var(--color-primary);
  border-radius: var(--radius-lg);
  font-size: var(--text-xl);
  margin-bottom: var(--space-4);
}

.feature-title {
  font-size: var(--text-lg);
  margin-bottom: var(--space-2);
}

.feature-description {
  color: var(--color-gray-400);
  font-size: var(--text-sm);
}

/* ========================================
   Specs Table
   ======================================== */

.specs-table {
  width: 100%;
  border-collapse: collapse;
}

.specs-table th,
.specs-table td {
  padding: var(--space-4);
  text-align: left;
  border-bottom: 1px solid var(--glass-border);
}

.specs-table th {
  color: var(--color-gray-500);
  font-size: var(--text-sm);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.specs-table td {
  color: var(--color-gray-200);
}

.specs-table tr:hover td {
  background: var(--glass-bg);
}

/* ========================================
   Community / Forum Styles
   ======================================== */

.thread-card {
  padding: var(--space-6);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  transition: all var(--transition-fast);
}

.thread-card:hover {
  border-color: var(--color-accent);
}

.thread-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.thread-avatar {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--color-accent) 0%, #6366f1 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: var(--text-sm);
}

.thread-meta {
  flex: 1;
}

.thread-author {
  font-weight: 600;
  font-size: var(--text-sm);
}

.thread-time {
  font-size: var(--text-xs);
  color: var(--color-gray-500);
}

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

.thread-title:hover {
  color: var(--color-accent);
}

.thread-preview {
  color: var(--color-gray-400);
  font-size: var(--text-sm);
  margin-bottom: var(--space-4);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.thread-footer {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  color: var(--color-gray-500);
  font-size: var(--text-sm);
}

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

.vote-btn {
  background: none;
  border: none;
  color: var(--color-gray-500);
  cursor: pointer;
  padding: var(--space-1);
  transition: color var(--transition-fast);
}

.vote-btn:hover {
  color: var(--color-accent);
}

.vote-count {
  font-weight: 600;
  min-width: 40px;
  text-align: center;
}

/* Sentiment Indicators */
.sentiment-positive { border-left: 3px solid var(--color-success); }
.sentiment-negative { border-left: 3px solid var(--color-error); }
.sentiment-neutral { border-left: 3px solid var(--color-gray-500); }

/* ========================================
   Blog Styles
   ======================================== */

.blog-card {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: var(--space-6);
  padding: var(--space-6);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  transition: all var(--transition-base);
}

.blog-card:hover {
  border-color: var(--color-accent);
  transform: translateX(4px);
}

.blog-card-image {
  aspect-ratio: 16/10;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-gray-800);
}

.blog-card-content {
  display: flex;
  flex-direction: column;
}

.blog-card-meta {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-bottom: var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-gray-500);
}

.blog-card-title {
  font-size: var(--text-xl);
  margin-bottom: var(--space-2);
}

.blog-card-excerpt {
  color: var(--color-gray-400);
  font-size: var(--text-sm);
  flex: 1;
}

@media (max-width: 768px) {
  .blog-card {
    grid-template-columns: 1fr;
  }
}

/* ========================================
   Footer
   ======================================== */

.footer {
  background: var(--color-secondary);
  border-top: 1px solid var(--glass-border);
  padding: var(--space-16) 0 var(--space-8);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: var(--space-12);
  margin-bottom: var(--space-12);
}

.footer-brand {
  max-width: 300px;
}

.footer-brand p {
  color: var(--color-gray-400);
  margin-top: var(--space-4);
  font-size: var(--text-sm);
}

.footer-column h4 {
  font-size: var(--text-sm);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-4);
  color: var(--color-gray-300);
}

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

.footer-links li {
  margin-bottom: var(--space-2);
}

.footer-links a {
  color: var(--color-gray-500);
  font-size: var(--text-sm);
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-8);
  border-top: 1px solid var(--glass-border);
  font-size: var(--text-sm);
  color: var(--color-gray-500);
}

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

.footer-social a {
  color: var(--color-gray-500);
  font-size: var(--text-xl);
  transition: color var(--transition-fast);
}

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

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8);
  }
  .footer-brand {
    grid-column: span 2;
  }
  .footer-bottom {
    flex-direction: column;
    gap: var(--space-4);
    text-align: center;
  }
}

/* ========================================
   Animations
   ======================================== */

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

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.animate-fade-in { animation: fadeIn 0.5s ease forwards; }
.animate-fade-in-up { animation: fadeInUp 0.5s ease forwards; }
.animate-pulse { animation: pulse 2s ease-in-out infinite; }
.animate-float { animation: float 3s ease-in-out infinite; }

/* Staggered Animation */
.stagger > * {
  opacity: 0;
  animation: fadeInUp 0.5s ease forwards;
}

.stagger > *:nth-child(1) { animation-delay: 0.1s; }
.stagger > *:nth-child(2) { animation-delay: 0.2s; }
.stagger > *:nth-child(3) { animation-delay: 0.3s; }
.stagger > *:nth-child(4) { animation-delay: 0.4s; }
.stagger > *:nth-child(5) { animation-delay: 0.5s; }

/* ========================================
   Utility Classes
   ======================================== */

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

.mt-4 { margin-top: var(--space-4); }
.mt-8 { margin-top: var(--space-8); }
.mt-12 { margin-top: var(--space-12); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-8 { margin-bottom: var(--space-8); }
.mb-12 { margin-bottom: var(--space-12); }

.hidden { display: none; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* ========================================
   Comparison Table
   ======================================== */

.compare-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--glass-bg);
  border-radius: var(--radius-xl);
  overflow: hidden;
}

.compare-table th,
.compare-table td {
  padding: var(--space-4) var(--space-6);
  text-align: center;
  border-bottom: 1px solid var(--glass-border);
}

.compare-table th {
  background: var(--color-secondary);
  font-weight: 600;
}

.compare-table th:first-child,
.compare-table td:first-child {
  text-align: left;
  font-weight: 500;
  color: var(--color-gray-400);
}

.compare-table tr:hover td {
  background: rgba(0, 212, 255, 0.05);
}

.compare-highlight {
  color: var(--color-accent);
  font-weight: 600;
}