/* =============================================
   BizEdu LMS - Design Tokens
   Premium Design System (yby_clone 기반)
   ============================================= */

:root {
  /* ===== Colors ===== */
  /* Primary - 브랜드 메인 컬러 (골드/베이지 계열) */
  --color-primary: #c9a962;
  --color-primary-light: #d4bc7d;
  --color-primary-dark: #b8944a;
  --color-primary-hover: #b8944a;
  --color-primary-active: #a68339;

  /* Secondary - 다크 컬러 */
  --color-secondary: #1a1a1a;
  --color-secondary-light: #2d2d2d;
  --color-secondary-dark: #0d0d0d;
  --color-secondary-hover: #2d2d2d;

  /* Accent - 강조 컬러 */
  --color-accent: #c9a962;
  --color-accent-hover: #b8944a;
  --color-accent-light: #f8f5ed;
  --color-accent-dark: #8b7355;

  /* Neutral - 중립 컬러 */
  --color-white: #ffffff;
  --color-black: #000000;
  --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;

  /* Background */
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f8f8f8;
  --color-bg-tertiary: #f5f5f5;
  --color-bg-dark: #1a1a1a;
  --color-bg-overlay: rgba(0, 0, 0, 0.7);

  /* Text */
  --color-text-primary: #1a1a1a;
  --color-text-secondary: #525252;
  --color-text-tertiary: #737373;
  --color-text-muted: #737373;
  --color-text-disabled: #a3a3a3;
  --color-text-inverse: #ffffff;
  --color-text-link: #c9a962;
  --color-text-link-hover: #b8944a;

  /* Status - Semantic Colors */
  --color-success: #22c55e;
  --color-success-light: #dcfce7;
  --color-success-dark: #16a34a;

  --color-warning: #f59e0b;
  --color-warning-light: #fef3c7;
  --color-warning-dark: #d97706;

  --color-error: #ef4444;
  --color-error-light: #fee2e2;
  --color-error-dark: #dc2626;

  --color-info: #b8944a;
  --color-info-light: #f8f5ed;
  --color-info-dark: #9a7b3c;

  /* Border Colors */
  --color-border-light: #e5e5e5;
  --color-border-default: #d4d4d4;
  --color-border-dark: #737373;
  --color-border-focus: #c9a962;

  /* ===== Typography ===== */
  /* Font Families */
  --font-family-sans: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-family-display: 'Noto Serif KR', Georgia, serif;
  --font-family-mono: 'JetBrains Mono', Consolas, monospace;
  --font-primary: var(--font-family-sans);
  --font-display: var(--font-family-display);
  --font-mono: var(--font-family-mono);

  /* Font Sizes */
  --font-size-xs: 0.75rem;    /* 12px */
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-base: 1rem;     /* 16px */
  --font-size-lg: 1.125rem;   /* 18px */
  --font-size-xl: 1.25rem;    /* 20px */
  --font-size-2xl: 1.5rem;    /* 24px */
  --font-size-3xl: 1.875rem;  /* 30px */
  --font-size-4xl: 2.25rem;   /* 36px */
  --font-size-5xl: 3rem;      /* 48px */
  --font-size-6xl: 3.75rem;   /* 60px */
  --font-size-7xl: 4.5rem;    /* 72px */

  /* Font Weights */
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* Line Heights */
  --line-height-tight: 1.25;
  --line-height-snug: 1.375;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.625;
  --line-height-loose: 2;

  /* Letter Spacing */
  --letter-spacing-tight: -0.025em;
  --letter-spacing-normal: 0;
  --letter-spacing-wide: 0.025em;
  --letter-spacing-wider: 0.05em;
  --letter-spacing-widest: 0.1em;

  /* ===== Spacing ===== */
  --spacing-0: 0;
  --spacing-1: 0.25rem;   /* 4px */
  --spacing-2: 0.5rem;    /* 8px */
  --spacing-3: 0.75rem;   /* 12px */
  --spacing-4: 1rem;      /* 16px */
  --spacing-5: 1.25rem;   /* 20px */
  --spacing-6: 1.5rem;    /* 24px */
  --spacing-8: 2rem;      /* 32px */
  --spacing-10: 2.5rem;   /* 40px */
  --spacing-12: 3rem;     /* 48px */
  --spacing-16: 4rem;     /* 64px */
  --spacing-20: 5rem;     /* 80px */
  --spacing-24: 6rem;     /* 96px */
  --spacing-32: 8rem;     /* 128px */

  /* Semantic Spacing (호환성 유지) */
  --spacing-xs: var(--spacing-1);
  --spacing-sm: var(--spacing-2);
  --spacing-md: var(--spacing-4);
  --spacing-lg: var(--spacing-6);
  --spacing-xl: var(--spacing-8);
  --spacing-2xl: var(--spacing-12);

  /* ===== Layout ===== */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
  --container-2xl: 1536px;
  --container-max-width: 1400px;
  --container-padding: var(--spacing-4);

  /* Sidebar & Header */
  --sidebar-width: 280px;
  --sidebar-collapsed-width: 64px;
  --header-height: 64px;

  /* ===== Border Radius ===== */
  --radius-none: 0;
  --radius-sm: 0.125rem;  /* 2px */
  --radius-md: 0.375rem;  /* 6px */
  --radius-lg: 0.5rem;    /* 8px */
  --radius-xl: 0.75rem;   /* 12px */
  --radius-2xl: 1rem;     /* 16px */
  --radius-full: 9999px;

  /* ===== Shadows ===== */
  --shadow-none: none;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);

  /* Card Shadow */
  --shadow-card: 0 2px 8px rgb(0 0 0 / 0.08);
  --shadow-card-hover: 0 4px 16px rgb(0 0 0 / 0.12);

  /* Dropdown Shadow */
  --shadow-dropdown: 0 4px 12px rgb(0 0 0 / 0.15);

  /* ===== Transitions ===== */
  --transition-fast: 150ms ease;
  --transition-normal: 300ms ease;
  --transition-slow: 500ms ease;
  --transition-slower: 700ms ease;

  /* ===== Z-Index ===== */
  --z-base: 0;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-fixed: 300;
  --z-modal-backdrop: 400;
  --z-modal: 500;
  --z-popover: 600;
  --z-tooltip: 700;
  --z-toast: 800;

  /* ===== Breakpoints (for reference in JS) ===== */
  --breakpoint-sm: 640px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 1024px;
  --breakpoint-xl: 1280px;
  --breakpoint-2xl: 1536px;
}

/* ===== Dark Mode Support ===== */
[data-theme="dark"] {
  --color-bg-primary: #1a1a1a;
  --color-bg-secondary: #262626;
  --color-bg-tertiary: #2d2d2d;
  --color-text-primary: #ffffff;
  --color-text-secondary: #a3a3a3;
  --color-text-tertiary: #737373;
  --color-border-light: #404040;
  --color-border-default: #525252;
  --color-primary-light: #3d3425;
  --shadow-card: 0 2px 8px rgb(0 0 0 / 0.3);
  --shadow-card-hover: 0 4px 16px rgb(0 0 0 / 0.4);
}

/* ===== Base Styles ===== */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family-sans);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-normal);
  color: var(--color-text-primary);
  background-color: var(--color-bg-secondary);
}

/* Focus visible for accessibility */
:focus-visible {
  outline: 2px solid var(--color-border-focus);
  outline-offset: 2px;
}

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