/**
 * 星辰社区 (Star Community) - Global Styles
 * ==========================================
 * CSS Variables, Reset, Utilities, and Animations
 * Based on Design.md specifications
 */

/* ========================================
   1. CSS VARIABLES
   ======================================== */
:root {
  /* Primary Colors */
  --color-bg-primary: #0a0a0f;
  --color-bg-secondary: #12121a;
  --color-bg-tertiary: #1a1a25;
  --color-accent-cyan: #00d4ff;
  --color-accent-purple: #a855f7;
  --color-accent-gold: #f59e0b;
  --color-accent-pink: #ec4899;

  /* Text Colors */
  --color-text-primary: #ffffff;
  --color-text-secondary: #a1a1aa;
  --color-text-muted: #71717a;
  --color-text-accent: #00d4ff;

  /* Semantic Colors */
  --color-success: #22c55e;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  --color-info: #3b82f6;

  /* Gradients */
  --gradient-hero: linear-gradient(135deg, #00d4ff 0%, #a855f7 50%, #ec4899 100%);
  --gradient-card: linear-gradient(145deg, rgba(0,212,255,0.1) 0%, rgba(168,85,247,0.1) 100%);
  --gradient-glow: radial-gradient(circle, rgba(0,212,255,0.3) 0%, transparent 70%);
  --gradient-gold: linear-gradient(135deg, #f59e0b 0%, #fbbf24 50%, #f59e0b 100%);

  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'Space Grotesk', 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --font-chinese: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;

  /* Type Scale */
  --text-h1: 4rem;
  --text-h2: 3rem;
  --text-h3: 2rem;
  --text-h4: 1.5rem;
  --text-h5: 1.25rem;
  --text-body: 1rem;
  --text-small: 0.875rem;
  --text-xsmall: 0.75rem;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -4px rgba(0, 0, 0, 0.4);
  --shadow-glow-cyan: 0 0 20px rgba(0, 212, 255, 0.5), 0 0 40px rgba(0, 212, 255, 0.3);
  --shadow-glow-purple: 0 0 20px rgba(168, 85, 247, 0.5), 0 0 40px rgba(168, 85, 247, 0.3);
  --shadow-glow-gold: 0 0 20px rgba(245, 158, 11, 0.5), 0 0 40px rgba(245, 158, 11, 0.3);

  /* Glassmorphism */
  --glass-bg: rgba(18, 18, 26, 0.7);
  --glass-border: 1px solid rgba(255, 255, 255, 0.1);
  --glass-backdrop: blur(20px) saturate(180%);
  --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);

  /* Animation Timing */
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out-back: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-in-out-cubic: cubic-bezier(0.65, 0, 0.35, 1);
  --ease-spring: cubic-bezier(0.68, -0.55, 0.265, 1.55);

  /* Animation Duration */
  --duration-fast: 150ms;
  --duration-normal: 300ms;
  --duration-slow: 500ms;
  --duration-slower: 800ms;

  /* Particle System */
  --particle-count: 150;
  --particle-size-min: 1;
  --particle-size-max: 3;
  --particle-color-1: #ffffff;
  --particle-color-2: #00d4ff;
  --particle-color-3: #a855f7;
  --particle-opacity-min: 0.3;
  --particle-opacity-max: 0.8;
  --connection-distance: 120;
  --connection-opacity: 0.15;
  --connection-color: #00d4ff;
  --mouse-interaction-radius: 150;
  --mouse-repel-force: 0.5;
  --movement-speed: 0.3;
  --twinkle-speed: 0.02;
}

/* ========================================
   2. BASE RESET (Specific selectors only)
   ======================================== */
html {
  scroll-behavior: smooth;
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-chinese), var(--font-primary);
  background-color: var(--color-bg-primary);
  color: var(--color-text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-family: var(--font-display), var(--font-chinese);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text-primary);
}

p {
  margin: 0;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-out-expo);
}

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

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  padding: 0;
}

ul, ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
}

/* ========================================
   3. TYPOGRAPHY UTILITIES
   ======================================== */
.text-h1 {
  font-size: var(--text-h1);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.text-h2 {
  font-size: var(--text-h2);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.text-h3 {
  font-size: var(--text-h3);
  font-weight: 600;
  line-height: 1.3;
}

.text-h4 {
  font-size: var(--text-h4);
  font-weight: 600;
  line-height: 1.4;
}

.text-h5 {
  font-size: var(--text-h5);
  font-weight: 500;
  line-height: 1.5;
}

.text-body {
  font-size: var(--text-body);
  font-weight: 400;
  line-height: 1.6;
}

.text-small {
  font-size: var(--text-small);
  font-weight: 400;
  line-height: 1.5;
}

.text-xsmall {
  font-size: var(--text-xsmall);
  font-weight: 400;
  line-height: 1.4;
  letter-spacing: 0.01em;
}

.text-gradient {
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.text-primary { color: var(--color-text-primary); }
.text-secondary { color: var(--color-text-secondary); }
.text-muted { color: var(--color-text-muted); }
.text-accent { color: var(--color-accent-cyan); }
.text-success { color: var(--color-success); }
.text-warning { color: var(--color-warning); }
.text-error { color: var(--color-error); }

.font-display { font-family: var(--font-display); }
.font-mono { font-family: var(--font-mono); }

/* ========================================
   4. GLASSMORPHISM UTILITIES
   ======================================== */
.glass {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-backdrop);
  -webkit-backdrop-filter: var(--glass-backdrop);
  border: var(--glass-border);
  box-shadow: var(--glass-shadow);
}

.glass-card {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-backdrop);
  -webkit-backdrop-filter: var(--glass-backdrop);
  border: var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: all var(--duration-normal) var(--ease-out-expo);
}

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

/* ========================================
   5. BUTTON STYLES
   ======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.875rem 2rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: var(--text-body);
  transition: all var(--duration-normal) var(--ease-out-expo);
  cursor: pointer;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-accent-cyan) 0%, var(--color-accent-purple) 100%);
  color: white;
  box-shadow: 0 0 20px rgba(0, 212, 255, 0.3);
}

.btn-primary:hover {
  filter: brightness(1.1);
  box-shadow: var(--shadow-glow-cyan);
  transform: translateY(-2px);
}

.btn-secondary {
  background: transparent;
  border: 1px solid rgba(0, 212, 255, 0.5);
  color: var(--color-accent-cyan);
}

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

.btn-ghost {
  background: transparent;
  color: var(--color-text-primary);
  padding: var(--space-2) var(--space-4);
}

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

.btn-gold {
  background: var(--gradient-gold);
  color: #0a0a0f;
  box-shadow: var(--shadow-glow-gold);
}

.btn-gold:hover {
  filter: brightness(1.1);
  transform: translateY(-2px);
}

/* ========================================
   6. CARD STYLES
   ======================================== */
.card {
  background: var(--color-bg-secondary);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: all var(--duration-normal) var(--ease-out-expo);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.feature-card {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-backdrop);
  border: var(--glass-border);
  border-left: 3px solid var(--color-accent-cyan);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: all var(--duration-normal) var(--ease-out-expo);
}

.feature-card:hover {
  border-color: rgba(0, 212, 255, 0.5);
  box-shadow: var(--shadow-glow-cyan);
  transform: translateY(-4px);
}

.pricing-card {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-backdrop);
  border: 2px solid transparent;
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  position: relative;
  transition: all var(--duration-normal) var(--ease-out-expo);
}

.pricing-card.featured {
  border-image: linear-gradient(135deg, var(--color-accent-cyan), var(--color-accent-purple)) 1;
}

.pricing-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-glow-cyan);
}

/* ========================================
   7. BADGE STYLES
   ======================================== */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--text-xsmall);
  font-weight: 500;
}

.badge-cyan {
  background: rgba(0, 212, 255, 0.15);
  color: var(--color-accent-cyan);
}

.badge-purple {
  background: rgba(168, 85, 247, 0.15);
  color: var(--color-accent-purple);
}

.badge-gold {
  background: rgba(245, 158, 11, 0.15);
  color: var(--color-accent-gold);
}

.badge-pink {
  background: rgba(236, 72, 153, 0.15);
  color: var(--color-accent-pink);
}

.badge-success {
  background: rgba(34, 197, 94, 0.15);
  color: var(--color-success);
}

/* ========================================
   8. FORM ELEMENTS
   ======================================== */
.input {
  width: 100%;
  background: rgba(18, 18, 26, 0.8);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  color: var(--color-text-primary);
  font-size: var(--text-body);
  transition: all var(--duration-fast) var(--ease-out-expo);
}

.input:focus {
  outline: none;
  border-color: var(--color-accent-cyan);
  box-shadow: 0 0 0 4px rgba(0, 212, 255, 0.2);
}

.input::placeholder {
  color: var(--color-text-muted);
}

/* ========================================
   9. PARTICLE SYSTEM STYLES
   ======================================== */
#particle-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
}

.particle-container {
  position: relative;
  overflow: hidden;
}

.particle-container::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--gradient-glow);
  opacity: 0.3;
  pointer-events: none;
  z-index: 0;
}

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

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

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

@keyframes glowPulse {
  0%, 100% {
    box-shadow: 0 0 20px rgba(0, 212, 255, 0.5);
  }
  50% {
    box-shadow: 0 0 40px rgba(0, 212, 255, 0.8);
  }
}

@keyframes glowPulsePurple {
  0%, 100% {
    box-shadow: 0 0 20px rgba(168, 85, 247, 0.5);
  }
  50% {
    box-shadow: 0 0 40px rgba(168, 85, 247, 0.8);
  }
}

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

@keyframes gradientShift {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}

@keyframes twinkle {
  0%, 100% {
    opacity: 0.3;
    transform: scale(1);
  }
  50% {
    opacity: 1;
    transform: scale(1.2);
  }
}

@keyframes pulse {
  0%, 100% {
    transform: scale(1);
    opacity: 1;
  }
  50% {
    transform: scale(1.05);
    opacity: 0.8;
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(50px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-50px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes rotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

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

@keyframes typewriter {
  from { width: 0; }
  to { width: 100%; }
}

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

/* ========================================
   11. ANIMATION UTILITIES
   ======================================== */
.animate-fadeInUp {
  animation: fadeInUp 600ms var(--ease-out-expo) forwards;
}

.animate-fadeInDown {
  animation: fadeInDown 600ms var(--ease-out-expo) forwards;
}

.animate-fadeIn {
  animation: fadeIn 600ms var(--ease-out-expo) forwards;
}

.animate-glowPulse {
  animation: glowPulse 2000ms ease-in-out infinite;
}

.animate-glowPulsePurple {
  animation: glowPulsePurple 2000ms ease-in-out infinite;
}

.animate-float {
  animation: float 3000ms ease-in-out infinite;
}

.animate-gradientShift {
  background-size: 200% 200%;
  animation: gradientShift 8000ms linear infinite;
}

.animate-twinkle {
  animation: twinkle 2000ms ease-in-out infinite;
}

.animate-pulse {
  animation: pulse 2000ms ease-in-out infinite;
}

.animate-slideInRight {
  animation: slideInRight 600ms var(--ease-out-expo) forwards;
}

.animate-slideInLeft {
  animation: slideInLeft 600ms var(--ease-out-expo) forwards;
}

.animate-rotate {
  animation: rotate 10000ms linear infinite;
}

/* Animation Delays */
.delay-100 { animation-delay: 100ms; }
.delay-200 { animation-delay: 200ms; }
.delay-300 { animation-delay: 300ms; }
.delay-400 { animation-delay: 400ms; }
.delay-500 { animation-delay: 500ms; }
.delay-600 { animation-delay: 600ms; }
.delay-700 { animation-delay: 700ms; }
.delay-800 { animation-delay: 800ms; }

/* Scroll Reveal Initial State */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 600ms var(--ease-out-expo), transform 600ms var(--ease-out-expo);
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* ========================================
   12. NAVIGATION STYLES
   ======================================== */
.nav-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: transparent;
  transition: all var(--duration-normal) var(--ease-out-expo);
}

.nav-header.scrolled {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-backdrop);
  -webkit-backdrop-filter: var(--glass-backdrop);
  border-bottom: var(--glass-border);
}

.nav-link {
  position: relative;
  padding: var(--space-2) var(--space-3);
  color: var(--color-text-secondary);
  font-weight: 500;
  transition: color var(--duration-fast) var(--ease-out-expo);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--gradient-hero);
  transition: all var(--duration-normal) var(--ease-out-expo);
  transform: translateX(-50%);
}

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

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

/* Mobile Navigation */
.mobile-menu {
  position: fixed;
  top: 0;
  right: -100%;
  width: 80%;
  max-width: 400px;
  height: 100vh;
  background: var(--color-bg-secondary);
  z-index: 1001;
  transition: right var(--duration-slow) var(--ease-out-expo);
  padding: var(--space-8);
}

.mobile-menu.open {
  right: 0;
}

.mobile-menu-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all var(--duration-normal) var(--ease-out-expo);
}

.mobile-menu-overlay.open {
  opacity: 1;
  visibility: visible;
}

/* ========================================
   13. FOOTER STYLES
   ======================================== */
.footer {
  background: var(--color-bg-secondary);
  border-top: var(--glass-border);
  padding: var(--space-16) 0 var(--space-8);
}

.footer-link {
  color: var(--color-text-secondary);
  transition: color var(--duration-fast) var(--ease-out-expo);
}

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

.social-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.05);
  color: var(--color-text-secondary);
  transition: all var(--duration-normal) var(--ease-out-expo);
}

.social-icon:hover {
  background: var(--color-accent-cyan);
  color: var(--color-bg-primary);
  transform: translateY(-2px);
}

/* ========================================
   14. UTILITY CLASSES
   ======================================== */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

@media (min-width: 640px) {
  .container {
    padding: 0 var(--space-6);
  }
}

@media (min-width: 1024px) {
  .container {
    padding: 0 var(--space-8);
  }
}

.section {
  padding: var(--space-16) 0;
}

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

.gradient-border {
  position: relative;
  background: var(--color-bg-secondary);
  border-radius: var(--radius-lg);
}

.gradient-border::before {
  content: '';
  position: absolute;
  inset: -2px;
  background: var(--gradient-hero);
  border-radius: calc(var(--radius-lg) + 2px);
  z-index: -1;
}

.glow-cyan {
  box-shadow: var(--shadow-glow-cyan);
}

.glow-purple {
  box-shadow: var(--shadow-glow-purple);
}

.glow-gold {
  box-shadow: var(--shadow-glow-gold);
}

/* Scrollbar Styling */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--color-accent-cyan);
  border-radius: var(--radius-full);
}

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

/* Selection */
::selection {
  background: rgba(0, 212, 255, 0.3);
  color: var(--color-text-primary);
}

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

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  html {
    scroll-behavior: auto;
  }
}

/* ========================================
   15. RESPONSIVE UTILITIES
   ======================================== */
@media (max-width: 768px) {
  .text-h1 {
    font-size: 2.5rem;
  }
  
  .text-h2 {
    font-size: 2rem;
  }
  
  .text-h3 {
    font-size: 1.5rem;
  }
  
  .section {
    padding: var(--space-12) 0;
  }
  
  .section-lg {
    padding: var(--space-16) 0;
  }
}

/* Hide on mobile */
@media (max-width: 768px) {
  .hide-mobile {
    display: none !important;
  }
}

/* Hide on desktop */
@media (min-width: 769px) {
  .hide-desktop {
    display: none !important;
  }
}