/* Linear.app 테마 - 미니멀하고 모던한 디자인 시스템 */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

/* CSS Variables from linear.app.json */
:root {
  /* Colors */
  --color-primary-50: #f0f4ff;
  --color-primary-100: #e0e9ff;
  --color-primary-200: #c7d6fe;
  --color-primary-300: #a5b8fc;
  --color-primary-400: #8b9cf8;
  --color-primary-500: #7c3aed;
  --color-primary-600: #6d28d9;
  --color-primary-700: #5b21b6;
  --color-primary-800: #4c1d95;
  --color-primary-900: #3c1a78;
  
  --color-neutral-0: #ffffff;
  --color-neutral-50: #fafafa;
  --color-neutral-100: #f5f5f5;
  --color-neutral-200: #eeeeee;
  --color-neutral-300: #e0e0e0;
  --color-neutral-400: #bdbdbd;
  --color-neutral-500: #9e9e9e;
  --color-neutral-600: #757575;
  --color-neutral-700: #616161;
  --color-neutral-800: #424242;
  --color-neutral-900: #212121;
  --color-neutral-950: #0a0a0a;
  
  --color-success-50: #f0fdf4;
  --color-success-500: #22c55e;
  --color-success-600: #16a34a;
  
  --color-warning-50: #fffbeb;
  --color-warning-500: #f59e0b;
  --color-warning-600: #d97706;
  
  --color-error-50: #fef2f2;
  --color-error-500: #ef4444;
  --color-error-600: #dc2626;
  
  --color-info-50: #eff6ff;
  --color-info-500: #3b82f6;
  --color-info-600: #2563eb;
  
  /* Typography */
  --font-family-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
  --font-family-mono: 'SF Mono', Monaco, Inconsolata, monospace;
  
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;
  
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;
  
  /* Spacing */
  --spacing-1: 0.25rem;
  --spacing-2: 0.5rem;
  --spacing-3: 0.75rem;
  --spacing-4: 1rem;
  --spacing-5: 1.25rem;
  --spacing-6: 1.5rem;
  --spacing-8: 2rem;
  --spacing-10: 2.5rem;
  --spacing-12: 3rem;
  --spacing-16: 4rem;
  --spacing-20: 5rem;
  --spacing-24: 6rem;
  --spacing-32: 8rem;
  
  /* Border Radius */
  --border-radius-sm: 0.125rem;
  --border-radius-default: 0.25rem;
  --border-radius-md: 0.375rem;
  --border-radius-lg: 0.5rem;
  --border-radius-xl: 0.75rem;
  --border-radius-2xl: 1rem;
  --border-radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-default: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.06);
  
  /* Animation */
  --transition-duration-fast: 150ms;
  --transition-duration-normal: 250ms;
  --transition-duration-slow: 400ms;
  --transition-easing: cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Mode */
[data-theme='dark'] {
  --color-background: #0a0a0a;
  --color-surface: #1a1a1a;
  --color-text-primary: #ffffff;
  --color-text-secondary: #a1a1aa;
  --color-text-tertiary: #71717a;
  --color-border: #27272a;
  
  --color-neutral-0: #0a0a0a;
  --color-neutral-50: #1a1a1a;
  --color-neutral-100: #ffffff;
  --color-neutral-800: #333333;
  --color-neutral-900: #ffffff;
}

/* Base Styles */
* {
  box-sizing: border-box;
}

body {
  font-family: var(--font-family-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-neutral-900);
  background-color: var(--color-neutral-0);
  margin: 0;
  transition: background-color var(--transition-duration-normal) var(--transition-easing),
              color var(--transition-duration-normal) var(--transition-easing);
}

[data-theme='dark'] body {
  color: var(--color-text-primary);
  background-color: var(--color-background);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  margin: 0 0 var(--spacing-4) 0;
  color: var(--color-neutral-900);
}

[data-theme='dark'] h1,
[data-theme='dark'] h2,
[data-theme='dark'] h3,
[data-theme='dark'] h4,
[data-theme='dark'] h5,
[data-theme='dark'] h6 {
  color: var(--color-text-primary);
}

h1 { font-size: var(--font-size-3xl); }
h2 { font-size: var(--font-size-2xl); }
h3 { font-size: var(--font-size-xl); }
h4 { font-size: var(--font-size-lg); }
h5 { font-size: var(--font-size-base); }
h6 { font-size: var(--font-size-sm); }

p {
  margin: 0 0 var(--spacing-4) 0;
  color: var(--color-neutral-600);
}

[data-theme='dark'] p {
  color: var(--color-text-secondary);
}

/* Container */
.linear-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-4);
}

/* Header/Navbar */
.linear-navbar {
  background-color: var(--color-neutral-0);
  border-bottom: 1px solid var(--color-neutral-100);
  padding: var(--spacing-3) 0;
  height: 64px;
  display: flex;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(8px);
  transition: all var(--transition-duration-normal) var(--transition-easing);
}

[data-theme='dark'] .linear-navbar {
  background-color: rgba(10, 10, 10, 0.8);
  border-bottom-color: var(--color-border);
}

.linear-navbar-content {
    display: flex;
    align-items: center;
    justify-content: space-between; /* This will push the nav to the right */
    height: var(--navbar-height);
}

.linear-navbar-brand {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-neutral-900);
  text-decoration: none;
  transition: color var(--transition-duration-fast) var(--transition-easing);
}

.linear-navbar-brand:hover {
  color: var(--color-primary-600);
  text-decoration: none;
}

[data-theme='dark'] .linear-navbar-brand {
  color: var(--color-text-primary);
}

.linear-navbar-nav {
  display: flex;
  align-items: center;
  gap: var(--spacing-6);
  list-style: none;
  margin: 0;
  padding: 0;
}

/* Buttons */
.linear-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--border-radius-md);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  transition: all var(--transition-duration-fast) var(--transition-easing);
  cursor: pointer;
  border: none;
  text-decoration: none;
  padding: var(--spacing-2) var(--spacing-4);
  position: relative;
  overflow: hidden;
}

.linear-button:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.1);
}

.linear-button-primary {
  background-color: var(--color-primary-500);
  color: var(--color-neutral-0);
}

.linear-button-primary:hover {
  background-color: var(--color-primary-600);
  color: var(--color-neutral-0);
  text-decoration: none;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.linear-button-secondary {
  background-color: transparent;
  color: var(--color-neutral-700);
  border: 1px solid var(--color-neutral-300);
}

.linear-button-secondary:hover {
  background-color: var(--color-neutral-50);
  border-color: var(--color-neutral-400);
  color: var(--color-neutral-800);
  text-decoration: none;
}

[data-theme='dark'] .linear-button-secondary {
  color: var(--color-text-secondary);
  border-color: var(--color-border);
}

[data-theme='dark'] .linear-button-secondary:hover {
  background-color: var(--color-surface);
  color: var(--color-text-primary);
}

.linear-button-ghost {
  background-color: transparent;
  color: var(--color-neutral-600);
  border: none;
}

.linear-button-ghost:hover {
  background-color: var(--color-neutral-100);
  color: var(--color-neutral-800);
  text-decoration: none;
}

[data-theme='dark'] .linear-button-ghost {
  color: var(--color-text-secondary);
}

[data-theme='dark'] .linear-button-ghost:hover {
  background-color: var(--color-surface);
  color: var(--color-text-primary);
}

/* Cards */
.linear-card {
  background-color: var(--color-neutral-0);
  border: 1px solid var(--color-neutral-100);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-6);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-duration-normal) var(--transition-easing);
  height: 100%;
  display: flex;
  flex-direction: column;
}

.linear-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  border-color: var(--color-neutral-200);
}

[data-theme='dark'] .linear-card {
  background-color: var(--color-surface);
  border-color: var(--color-border);
}

[data-theme='dark'] .linear-card:hover {
  border-color: #333;
}

.linear-card-elevated {
  box-shadow: var(--shadow-md);
}

.linear-card-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-2);
  color: var(--color-neutral-900);
}

[data-theme='dark'] .linear-card-title {
  color: var(--color-text-primary);
}

.linear-card-description {
  color: var(--color-neutral-600);
  margin-bottom: var(--spacing-4);
  flex-grow: 1;
}

[data-theme='dark'] .linear-card-description {
  color: var(--color-text-secondary);
}

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

.linear-grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
.linear-grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.linear-grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.linear-grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }



/* Header Section */
.linear-header {
  text-align: center;
  margin-bottom: var(--spacing-12);
  padding: var(--spacing-16) 0 var(--spacing-8) 0;
}

.linear-header h1 {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-4);
  background: linear-gradient(135deg, var(--color-primary-600), var(--color-primary-400));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.linear-header p {
  font-size: var(--font-size-lg);
  color: var(--color-neutral-600);
  max-width: 600px;
  margin: 0 auto;
}

[data-theme='dark'] .linear-header p {
  color: var(--color-text-secondary);
}

/* Theme Toggle */
.linear-theme-toggle {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-2);
  border-radius: var(--border-radius-md);
  transition: background-color var(--transition-duration-fast) var(--transition-easing);
}

.linear-theme-toggle:hover {
  background-color: var(--color-neutral-100);
}

[data-theme='dark'] .linear-theme-toggle:hover {
  background-color: var(--color-surface);
}

/* Language Dropdown */
.linear-dropdown {
  position: relative;
  display: inline-block;
}

.linear-dropdown-trigger {
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-2) var(--spacing-3);
  border-radius: var(--border-radius-md);
  font-size: var(--font-size-sm);
  color: var(--color-neutral-700);
  transition: all var(--transition-duration-fast) var(--transition-easing);
}

.linear-dropdown-trigger:hover {
  background-color: var(--color-neutral-100);
}

[data-theme='dark'] .linear-dropdown-trigger {
  color: var(--color-text-secondary);
}

[data-theme='dark'] .linear-dropdown-trigger:hover {
  background-color: var(--color-surface);
}

/* Ad Containers for Google AdSense Optimization */
.linear-ad-container {
  margin: var(--spacing-4) 0;
  text-align: center;
}

.linear-ad-banner {
  min-height: 0;
  height: auto;
  background-color: var(--color-neutral-50);
  border: 1px dashed var(--color-neutral-200);
  border-radius: var(--border-radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-neutral-400);
  font-size: var(--font-size-sm);
  padding: var(--spacing-2);
}

.linear-ad-banner.no-ad {
  height: 0;
  overflow: hidden;
  padding: 0;
  margin: 0;
  border: none;
  background-color: transparent;
}

[data-theme='dark'] .linear-ad-banner {
  background-color: var(--color-surface);
  border-color: var(--color-border);
  color: var(--color-text-tertiary);
}

.linear-ad-sidebar {
  min-height: 0;
  height: auto;
  background-color: var(--color-neutral-50);
  border: 1px dashed var(--color-neutral-200);
  border-radius: var(--border-radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-neutral-400);
  font-size: var(--font-size-sm);
  margin: var(--spacing-2) 0;
  padding: var(--spacing-2);
}

.linear-ad-sidebar.no-ad {
  height: 0;
  overflow: hidden;
  padding: 0;
  margin: 0;
  border: none;
  background-color: transparent;
}

[data-theme='dark'] .linear-ad-sidebar {
  background-color: var(--color-surface);
  border-color: var(--color-border);
  color: var(--color-text-tertiary);
}

/* Utility Classes */
.linear-text-center { text-align: center; }
.linear-text-left { text-align: left; }
.linear-text-right { text-align: right; }

.linear-mb-2 { margin-bottom: var(--spacing-2); }
.linear-mb-4 { margin-bottom: var(--spacing-4); }
.linear-mb-6 { margin-bottom: var(--spacing-6); }
.linear-mb-8 { margin-bottom: var(--spacing-8); }

.linear-mt-2 { margin-top: var(--spacing-2); }
.linear-mt-4 { margin-top: var(--spacing-4); }
.linear-mt-6 { margin-top: var(--spacing-6); }
.linear-mt-8 { margin-top: var(--spacing-8); }

.linear-p-4 { padding: var(--spacing-4); }
.linear-p-6 { padding: var(--spacing-6); }
.linear-p-8 { padding: var(--spacing-8); }

/* Loading States */
.linear-loading {
  opacity: 0.6;
  pointer-events: none;
}

.linear-spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid var(--color-neutral-200);
  border-radius: 50%;
  border-top-color: var(--color-primary-500);
  animation: linear-spin 1s ease-in-out infinite;
}

@keyframes linear-spin {
  to { transform: rotate(360deg); }
}

/* Responsive Design */
@media (max-width: 640px) {
  .linear-navbar-nav {
    gap: var(--spacing-3);
  }
  
  .linear-header h1 {
    font-size: var(--font-size-3xl);
  }
  
  .linear-header p {
    font-size: var(--font-size-base);
  }
  
  .linear-container {
    padding: 0 var(--spacing-3);
  }
  
  .linear-card {
    padding: var(--spacing-4);
  }
  
  .linear-grid {
    gap: var(--spacing-4);
  }
}

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

/* Focus styles for better accessibility */
.linear-button:focus-visible,
.linear-theme-toggle:focus-visible,
.linear-dropdown-trigger:focus-visible {
  outline: 2px solid var(--color-primary-500);
  outline-offset: 2px;
}

/* High contrast mode support */
@media (forced-colors: active) {
  .linear-card {
    border: 1px solid;
  }
  
  .linear-button-primary {
    border: 1px solid;
  }
}