/* =================================================================
   Webzine SaaS AI WebService — Global Design Tokens & Reset
   Font: Pretendard(KR), Outfit(EN Headline), Playfair Display(Serif)
   Based on 5-1 Design System Specification
   ================================================================= */

/* -----------------------------------------------------------------
   1. COLOR PALETTE — HSL 기반 색상 시스템
   ----------------------------------------------------------------- */
:root {
  /* ── Primary (Blue) ── */
  --color-primary-50:  #eff6ff;
  --color-primary-100: #dbeafe;
  --color-primary-200: #bfdbfe;
  --color-primary-300: #93c5fd;
  --color-primary-400: #60a5fa;
  --color-primary-500: #3b82f6;
  --color-primary-600: #2563eb;
  --color-primary-700: #1d4ed8;
  --color-primary-800: #1e40af;
  --color-primary-900: #1e3a8a;

  /* ── Accent (Violet/Purple) ── */
  --color-accent-50:  #f5f3ff;
  --color-accent-100: #ede9fe;
  --color-accent-200: #ddd6fe;
  --color-accent-300: #c4b5fd;
  --color-accent-400: #a78bfa;
  --color-accent-500: #8b5cf6;
  --color-accent-600: #7c3aed;
  --color-accent-700: #6d28d9;
  --color-accent-800: #5b21b6;
  --color-accent-900: #4c1d95;

  /* ── Neutral (Slate) ── */
  --color-neutral-50:  #f8fafc;
  --color-neutral-100: #f1f5f9;
  --color-neutral-200: #e2e8f0;
  --color-neutral-300: #cbd5e1;
  --color-neutral-400: #94a3b8;
  --color-neutral-500: #64748b;
  --color-neutral-600: #475569;
  --color-neutral-700: #334155;
  --color-neutral-800: #1e293b;
  --color-neutral-900: #0f172a;
  --color-neutral-950: #020617;

  /* ── Semantic ── */
  --color-success:     #22c55e;
  --color-success-bg:  #f0fdf4;
  --color-success-dark:#16a34a;
  --color-warning:     #f59e0b;
  --color-warning-bg:  #fffbeb;
  --color-warning-dark:#d97706;
  --color-danger:      #ef4444;
  --color-danger-bg:   #fef2f2;
  --color-danger-dark: #dc2626;
  --color-info:        #06b6d4;
  --color-info-bg:     #ecfeff;
  --color-info-dark:   #0891b2;

  /* ── Mapped Semantic Aliases (Light) ── */
  --color-primary:      var(--color-primary-500);
  --color-primary-dark: var(--color-primary-600);
  --color-primary-hover:var(--color-primary-600);
  --color-bg:           #ffffff;
  --color-bg-alt:       var(--color-neutral-50);
  --color-surface:      #ffffff;
  --color-surface-alt:  var(--color-neutral-50);
  --color-border:       var(--color-neutral-200);
  --color-border-hover: var(--color-neutral-300);
  --color-text:         var(--color-neutral-900);
  --color-text-secondary: var(--color-neutral-600);
  --color-text-muted:   var(--color-neutral-500);
  --color-text-inverse: #ffffff;
  --color-overlay:      rgba(15, 23, 42, 0.5);

  /* -----------------------------------------------------------------
     2. TYPOGRAPHY
     ----------------------------------------------------------------- */
  --font-sans:  'Pretendard Variable', 'Pretendard', 'Outfit', system-ui, -apple-system, sans-serif;
  --font-serif: 'Playfair Display', Georgia, 'Times New Roman', serif;
  --font-mono:  'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  --font-display: 'Outfit', var(--font-sans);

  /* Size Scale */
  --text-xs:   0.75rem;    /* 12px */
  --text-sm:   0.8125rem;  /* 13px */
  --text-base: 0.875rem;   /* 14px */
  --text-md:   0.9375rem;  /* 15px */
  --text-lg:   1rem;       /* 16px */
  --text-xl:   1.125rem;   /* 18px */
  --text-2xl:  1.25rem;    /* 20px */
  --text-3xl:  1.5rem;     /* 24px */
  --text-4xl:  2.25rem;    /* 36px */

  /* Line Height */
  --leading-none:    1;
  --leading-tight:   1.25;
  --leading-snug:    1.375;
  --leading-normal:  1.5;
  --leading-relaxed: 1.625;
  --leading-loose:   1.8;

  /* Font Weight */
  --font-light:    300;
  --font-regular:  400;
  --font-medium:   500;
  --font-semibold: 600;
  --font-bold:     700;

  /* -----------------------------------------------------------------
     3. SPACING — 4px Grid System
     ----------------------------------------------------------------- */
  --space-0:  0;
  --space-px: 1px;
  --space-0_5: 0.125rem; /* 2px */
  --space-1:  0.25rem;   /* 4px */
  --space-1_5: 0.375rem; /* 6px */
  --space-2:  0.5rem;    /* 8px */
  --space-3:  0.75rem;   /* 12px */
  --space-4:  1rem;      /* 16px */
  --space-5:  1.25rem;   /* 20px */
  --space-6:  1.5rem;    /* 24px */
  --space-8:  2rem;      /* 32px */
  --space-10: 2.5rem;    /* 40px */
  --space-12: 3rem;      /* 48px */
  --space-14: 3.5rem;    /* 56px */
  --space-16: 4rem;      /* 64px */
  --space-20: 5rem;      /* 80px */

  /* -----------------------------------------------------------------
     4. BORDER RADIUS
     ----------------------------------------------------------------- */
  --radius-none: 0;
  --radius-sm:   4px;
  --radius-md:   8px;
  --radius-lg:   12px;
  --radius-xl:   16px;
  --radius-2xl:  20px;
  --radius-full: 9999px;

  /* -----------------------------------------------------------------
     5. BOX SHADOW
     ----------------------------------------------------------------- */
  --shadow-xs:  0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-sm:  0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md:  0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg:  0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --shadow-xl:  0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
  --shadow-inner: inset 0 2px 4px rgba(0, 0, 0, 0.06);

  /* Focus ring */
  --ring-color:  var(--color-primary-400);
  --ring-offset: 2px;
  --ring-width:  3px;

  /* -----------------------------------------------------------------
     6. TRANSITION & ANIMATION
     ----------------------------------------------------------------- */
  --ease-default: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-in:      cubic-bezier(0.4, 0, 1, 1);
  --ease-out:     cubic-bezier(0, 0, 0.2, 1);
  --ease-spring:  cubic-bezier(0.34, 1.56, 0.64, 1);
  --duration-fast:    150ms;
  --duration-normal:  300ms;
  --duration-slow:    500ms;

  /* -----------------------------------------------------------------
     7. LAYOUT DIMENSIONS
     ----------------------------------------------------------------- */
  --header-h:   64px;
  --lnb-w:      260px;
  --lnb-w-mini: 64px;
  --content-max-w: 1280px;

  /* -----------------------------------------------------------------
     8. Z-INDEX SCALE
     ----------------------------------------------------------------- */
  --z-dropdown: 100;
  --z-sticky:   200;
  --z-overlay:  300;
  --z-modal:    400;
  --z-toast:    500;
  --z-tooltip:  600;
}

/* -----------------------------------------------------------------
   DARK MODE — 실제 다크 색상표
   ----------------------------------------------------------------- */
html[data-theme="dark"] {
  --color-bg:           var(--color-neutral-950);
  --color-bg-alt:       var(--color-neutral-900);
  --color-surface:      var(--color-neutral-900);
  --color-surface-alt:  var(--color-neutral-800);
  --color-border:       var(--color-neutral-700);
  --color-border-hover: var(--color-neutral-600);
  --color-text:         var(--color-neutral-50);
  --color-text-secondary: var(--color-neutral-300);
  --color-text-muted:   var(--color-neutral-400);
  --color-text-inverse: var(--color-neutral-900);
  --color-overlay:      rgba(0, 0, 0, 0.7);

  /* Primary & Accent — 다크모드에서 밝기 보정 */
  --color-primary:       var(--color-primary-400);
  --color-primary-dark:  var(--color-primary-500);
  --color-primary-hover: var(--color-primary-300);

  /* Semantic — 다크모드 배경 보정 */
  --color-success-bg:  rgba(34, 197, 94, 0.1);
  --color-warning-bg:  rgba(245, 158, 11, 0.1);
  --color-danger-bg:   rgba(239, 68, 68, 0.1);
  --color-info-bg:     rgba(6, 182, 212, 0.1);

  /* Shadow — 다크모드 강화 */
  --shadow-xs:  0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-sm:  0 1px 3px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.15);
  --shadow-md:  0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -2px rgba(0, 0, 0, 0.15);
  --shadow-lg:  0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --shadow-xl:  0 20px 25px -5px rgba(0, 0, 0, 0.4), 0 8px 10px -6px rgba(0, 0, 0, 0.2);

  /* Focus ring */
  --ring-color: var(--color-primary-500);
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  font-weight: var(--font-regular);
  line-height: var(--leading-normal);
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
}

/* Links */
a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-default);
}
a:hover {
  color: var(--color-primary-hover);
}

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

/* Lists */
ul, ol { list-style: none; }

/* Tables */
table { border-collapse: collapse; border-spacing: 0; }

/* Form elements */
input, button, textarea, select {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  border: none;
  background: none;
}

/* Focus ring utility */
:focus-visible {
  outline: var(--ring-width) solid var(--ring-color);
  outline-offset: var(--ring-offset);
}

/* Selection */
::selection {
  background: var(--color-primary-200);
  color: var(--color-primary-900);
}

html[data-theme="dark"] ::selection {
  background: var(--color-primary-800);
  color: var(--color-primary-100);
}

/* -----------------------------------------------------------------
   UTILITY: Visually Hidden (SR only)
   ----------------------------------------------------------------- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}