/* ================================
   LINEAR DARK THEME - 次元智造局
   ================================ */

/* ================================
   CSS Variables - Linear Style
   ================================ */
:root {
  /* Linear Color Palette */
  --primary-purple: #8b5cf6;
  --primary-indigo: #6366f1;
  --accent-purple: #a78bfa;
  --accent-blue: #60a5fa;

  /* Backgrounds */
  --bg-primary: #0d0d0f;
  --bg-secondary: #1a1a1d;
  --bg-tertiary: #27272a;
  --bg-card: rgba(39, 39, 42, 0.6);
  --bg-card-hover: rgba(39, 39, 42, 0.9);

  /* Text Colors */
  --text-primary: #f4f4f5;
  --text-secondary: #a1a1aa;
  --text-tertiary: #71717a;

  /* Borders */
  --border-primary: rgba(255, 255, 255, 0.1);
  --border-secondary: rgba(255, 255, 255, 0.05);
  --border-accent: rgba(139, 92, 246, 0.3);

  /* 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);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 20px rgba(139, 92, 246, 0.3);
  --shadow-glow-lg: 0 0 40px rgba(139, 92, 246, 0.5);

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4rem;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Z-Index */
  --z-header: 1000;
  --z-modal: 2000;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  color-scheme: dark;
}

body {
  font-family:
    -apple-system,
    BlinkMacSystemFont,
    'Segoe UI',
    'Roboto',
    'Helvetica Neue',
    Arial,
    sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
}

/* ================================
   Typography
   ================================ */
h1,
h2,
h3,
h4,
h5,
h6 {
  line-height: 1.2;
  font-weight: 600;
  margin-bottom: var(--space-md);
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

h1 {
  font-size: 3rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary-purple) 0%, var(--primary-indigo) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

h2 {
  font-size: 2rem;
  font-weight: 600;
}

h3 {
  font-size: 1.5rem;
  font-weight: 600;
}

h4 {
  font-size: 1.25rem;
  font-weight: 600;
}

p {
  margin-bottom: var(--space-sm);
  color: var(--text-secondary);
  line-height: 1.7;
}

a {
  color: var(--primary-purple);
  text-decoration: none;
  transition: all var(--transition-fast);
}

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

/* ================================
   Smooth Animations
   ================================ */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInScale {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes shimmer {
  0% {
    background-position: -1000px 0;
  }
  100% {
    background-position: 1000px 0;
  }
}

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

@keyframes pulse-glow {
  0%,
  100% {
    box-shadow: 0 0 20px rgba(139, 92, 246, 0.3);
  }
  50% {
    box-shadow: 0 0 40px rgba(139, 92, 246, 0.5);
  }
}

/* ================================
   Buttons - Linear Style
   ================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border: 1px solid var(--border-accent);
  background: transparent;
  color: var(--primary-purple);
  font-weight: 500;
  font-size: 0.9rem;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
  text-decoration: none;
  backdrop-filter: blur(10px);
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--primary-purple), var(--primary-indigo));
  opacity: 0;
  transition: opacity var(--transition-normal);
  z-index: -1;
}

.btn:hover::before {
  opacity: 1;
}

.btn:hover {
  color: white;
  border-color: transparent;
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-purple), var(--primary-indigo));
  border: none;
  color: white;
}

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

.btn-secondary {
  border-color: var(--border-primary);
  color: var(--text-primary);
}

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

/* ================================
   Header - Linear Style
   ================================ */
.header {
  background: rgba(13, 13, 15, 0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-primary);
  padding: 1rem 2rem;
  position: sticky;
  top: 0;
  z-index: var(--z-header);
}

.header-content {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  transition: all var(--transition-fast);
  letter-spacing: -0.02em;
}

.logo:hover {
  color: var(--primary-purple);
}

.logo-icon {
  font-size: 1.5rem;
  transition: transform var(--transition-normal);
}

.logo:hover .logo-icon {
  transform: scale(1.1);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* ================================
   Tools Navigation
   ================================ */
.tools-nav {
  background: rgba(26, 26, 29, 0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-primary);
  padding: 1rem 2rem;
  margin-top: 2rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.tools-nav-content {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.tools-nav a {
  padding: 1rem 1.5rem;
  color: var(--text-secondary);
  font-weight: 500;
  border-bottom: 2px solid transparent;
  transition: all var(--transition-fast);
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.tools-nav a:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

.tools-nav a.active {
  color: var(--primary-purple);
  border-bottom-color: var(--primary-purple);
  background: rgba(139, 92, 246, 0.1);
}

/* ================================
   Systems Switcher
   ================================ */
.systems-switcher {
  background: rgba(13, 13, 15, 0.6);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-primary);
  padding: 1rem 2rem;
}

.systems-switcher-content {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.systems-switcher button {
  padding: 0.625rem 1.25rem;
  background: transparent;
  border: 1px solid var(--border-primary);
  color: var(--text-secondary);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  border-radius: var(--radius-md);
  backdrop-filter: blur(10px);
}

.systems-switcher button:hover {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
  border-color: var(--border-accent);
  transform: translateY(-1px);
}

.systems-switcher button.active {
  background: linear-gradient(135deg, var(--primary-purple), var(--primary-indigo));
  color: white;
  border-color: transparent;
  box-shadow: var(--shadow-glow);
}

/* ================================
   Main Content Container
   ================================ */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 2rem;
}

.content {
  max-width: 900px;
  margin: 0 auto;
  padding: var(--space-xl) var(--space-lg);
}

/* ================================
   Hero Section
   ================================ */
.hero {
  text-align: center;
  padding: var(--space-2xl) var(--space-lg);
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-xl);
  margin-bottom: var(--space-xl);
  position: relative;
  overflow: hidden;
  animation: fadeInScale var(--transition-slow) ease-out;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(
    circle,
    rgba(139, 92, 246, 0.1) 0%,
    transparent 70%
  );
  animation: float 6s ease-in-out infinite;
  pointer-events: none;
}

.hero h1 {
  font-size: 2.75rem;
  margin-bottom: var(--space-md);
  position: relative;
  z-index: 1;
  font-weight: 600;
  letter-spacing: -0.03em;
}

.hero p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.hero-subtitle {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text-secondary);
  max-width: 700px;
  margin: 0 auto;
}

/* ================================
   Tools Grid & Cards
   ================================ */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
}

.tool-card {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-primary);
  padding: var(--space-lg);
  text-align: center;
  transition: all var(--transition-normal);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  animation: fadeIn var(--transition-slow) ease-out;
}

.tool-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.1), transparent);
  opacity: 0;
  transition: opacity var(--transition-normal);
  pointer-events: none;
}

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

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

.tool-card .icon {
  font-size: 3rem;
  margin-bottom: var(--space-md);
  transition: transform var(--transition-normal);
}

.tool-card:hover .icon {
  transform: scale(1.1);
}

.tool-card h3 {
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
  font-weight: 600;
}

.tool-card p {
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
  flex-grow: 1;
  font-size: 0.95rem;
}

.tool-card .btn {
  width: 100%;
  margin-top: auto;
}

/* ================================
   Content Sections & Steps
   ================================ */
.section {
  margin-bottom: var(--space-xl);
}

.step {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-primary);
  padding: var(--space-lg);
  margin-bottom: var(--space-lg);
  position: relative;
  border-radius: var(--radius-lg);
  transition: all var(--transition-normal);
}

.step:hover {
  border-color: var(--border-accent);
  box-shadow: var(--shadow-md);
}

.step-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.step-number {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--primary-purple), var(--primary-indigo));
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 1.1rem;
  flex-shrink: 0;
  box-shadow: var(--shadow-glow);
}

.step-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
}

/* ================================
   Code Blocks - Clean Style
   ================================ */
.code-block {
  position: relative;
  margin: var(--space-md) 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border-primary);
  transition: all var(--transition-normal);
}

.code-block:hover {
  border-color: var(--border-accent);
  box-shadow: var(--shadow-md);
}

.code-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1rem;
  background: var(--bg-tertiary);
  border-bottom: 1px solid var(--border-primary);
}

.code-label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  font-family: 'Courier New', monospace;
}

.copy-btn {
  background: transparent;
  border: 1px solid var(--border-primary);
  color: var(--text-secondary);
  padding: 0.375rem 0.875rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: 0.375rem;
}

.copy-btn:hover {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
  border-color: var(--border-accent);
}

.copy-btn.copied {
  background: var(--primary-purple);
  color: white;
  border-color: var(--primary-purple);
}

pre[class*='language-'] {
  margin: 0;
  background: var(--bg-secondary) !important;
  position: relative;
  padding: 1rem !important;
}

code[class*='language-'] {
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--text-primary) !important;
  font-family: 'Courier New', monospace !important;
}

:not(pre) > code {
  background: var(--bg-tertiary);
  color: var(--primary-purple);
  padding: 0.2em 0.4em;
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-sm);
  font-size: 0.9em;
  font-family: 'Courier New', monospace;
}

/* ================================
   Alert Boxes - Linear Style
   ================================ */
.alert {
  padding: var(--space-md);
  border-radius: var(--radius-md);
  margin: var(--space-md) 0;
  border: 1px solid;
  display: flex;
  gap: var(--space-sm);
  align-items: flex-start;
  backdrop-filter: blur(20px);
  position: relative;
  overflow: hidden;
  transition: all var(--transition-normal);
}

.alert:hover {
  transform: translateX(4px);
}

.alert-icon {
  font-size: 1.25rem;
  flex-shrink: 0;
  margin-top: 0.125rem;
}

.alert-content {
  flex: 1;
}

.alert-content ul {
  margin-left: 1.5rem;
  margin-top: 0.5rem;
}

.alert-info {
  background: rgba(139, 92, 246, 0.1);
  border-color: var(--border-accent);
  color: var(--primary-purple);
}

.alert-info .alert-icon {
  color: var(--primary-purple);
}

.alert-warning {
  background: rgba(251, 191, 36, 0.1);
  border-color: rgba(251, 191, 36, 0.3);
  color: #fbbf24;
}

.alert-warning .alert-icon {
  color: #fbbf24;
}

.alert-success {
  background: rgba(34, 197, 94, 0.1);
  border-color: rgba(34, 197, 94, 0.3);
  color: #22c55e;
}

.alert-success .alert-icon {
  color: #22c55e;
}

.alert-error {
  background: rgba(239, 68, 68, 0.1);
  border-color: rgba(239, 68, 68, 0.3);
  color: #ef4444;
}

.alert-error .alert-icon {
  color: #ef4444;
}

/* ================================
   Footer
   ================================ */
.footer {
  background: rgba(13, 13, 15, 0.8);
  backdrop-filter: blur(20px);
  border-top: 1px solid var(--border-primary);
  padding: var(--space-xl) var(--space-lg);
  margin-top: var(--space-xl);
}

.footer-content {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.footer-links {
  display: flex;
  gap: var(--space-lg);
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--text-secondary);
  font-weight: 500;
  transition: all var(--transition-fast);
}

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

/* ================================
   Scrollbar - Linear Style
   ================================ */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--bg-tertiary);
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast);
}

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

/* ================================
   Utilities
   ================================ */
.hidden {
  display: none !important;
}

.fade-in {
  animation: fadeIn var(--transition-slow) ease-out;
}

/* GPU Acceleration */
.gpu-accelerated {
  transform: translateZ(0);
  will-change: transform, opacity;
}

/* ================================
   Responsive Design
   ================================ */
@media (max-width: 768px) {
  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  .header {
    padding: 1rem;
  }

  .hero {
    padding: var(--space-xl) var(--space-md);
  }

  .hero h1 {
    font-size: 2rem;
  }

  .hero p {
    font-size: 1rem;
  }

  .tools-grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .content {
    padding: var(--space-lg) var(--space-sm);
  }

  .container {
    padding: 1rem;
  }

  .footer-content {
    flex-direction: column;
    text-align: center;
  }

  .tools-nav {
    padding: 0 1rem;
  }

  .systems-switcher {
    padding: 1rem;
  }

  .step-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .logo {
    font-size: 1rem;
  }

  .logo-icon {
    font-size: 1.25rem;
  }
}

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

/* ================================
   Print Styles
   ================================ */
@media print {
  .header,
  .footer,
  .tools-nav,
  .systems-switcher,
  .btn {
    display: none;
  }

  body {
    background: white;
    color: black;
  }

  h1,
  h2,
  h3,
  h4,
  h5,
  h6 {
    color: black;
  }
}