/* =========================================
   variables.css — ZNex Lab
   Design Tokens · Space Edition
   Monochrome · Black & White Universe
   ========================================= */

:root {
  /* =========================================
     Color Palette — Space Monochrome
     ========================================= */

  /* 배경 레이어 (깊은 우주 → 표면) */
  --color-bg-base:     #000000;   /* 우주 심연 — 순수 블랙 */
  --color-bg-surface:  #0D0D0D;   /* 섹션 배경 */
  --color-bg-elevated: #1A1A1A;   /* 카드 배경 */
  --color-bg-overlay:  #111111;   /* 호버 / 강조 레이어 */
  --color-bg-glass:    rgba(255, 255, 255, 0.03); /* 글래스모피즘 베이스 */

  /* 텍스트 */
  --color-text-primary:   #FFFFFF;   /* 순백 헤드라인 */
  --color-text-secondary: #AAAAAA;   /* 회색 서브텍스트 */
  --color-text-muted:     #666666;   /* 힌트, 레이블 */
  --color-text-inverse:   #000000;   /* 밝은 배경 위 다크 텍스트 */

  /* 브랜드 — 모노크롬 */
  --color-primary:        #FFFFFF;
  --color-primary-light:  rgba(255, 255, 255, 0.15);
  --color-primary-dark:   #CCCCCC;
  --color-primary-subtle: rgba(255, 255, 255, 0.05);

  --color-secondary:        #888888;
  --color-secondary-light:  #AAAAAA;
  --color-secondary-dark:   #666666;
  --color-secondary-subtle: rgba(136, 136, 136, 0.08);

  --color-accent:        #DDDDDD;
  --color-accent-dark:   #BBBBBB;
  --color-accent-subtle: rgba(221, 221, 221, 0.06);

  /* 상태 */
  --color-active:        #FFFFFF;
  --color-active-subtle: rgba(255, 255, 255, 0.06);
  --color-coming-soon:   #444444;
  --color-error:         #999999;
  --color-error-subtle:  rgba(153, 153, 153, 0.10);

  /* 보더 */
  --color-border:           rgba(255, 255, 255, 0.08);
  --color-border-subtle:    rgba(255, 255, 255, 0.04);
  --color-border-strong:    rgba(255, 255, 255, 0.18);
  --color-border-active:    rgba(255, 255, 255, 0.30);
  --color-border-secondary: rgba(255, 255, 255, 0.12);
  --color-border-accent:    rgba(255, 255, 255, 0.20);
  --color-border-hover:     rgba(255, 255, 255, 0.20);

  /* =========================================
     Spacing (8px 그리드 기반)
     ========================================= */
  --space-1:  0.25rem;   /*  4px */
  --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-7:  1.75rem;   /* 28px */
  --space-8:  2rem;      /* 32px */
  --space-10: 2.5rem;    /* 40px */
  --space-12: 3rem;      /* 48px */
  --space-16: 4rem;      /* 64px */
  --space-20: 5rem;      /* 80px */
  --space-24: 6rem;      /* 96px */
  --space-32: 8rem;      /* 128px */

  /* =========================================
     Border Radius
     ========================================= */
  --radius-xs:   4px;
  --radius-sm:   8px;
  --radius-md:   14px;
  --radius-lg:   22px;
  --radius-xl:   32px;
  --radius-full: 9999px;

  /* =========================================
     Transitions
     ========================================= */
  --transition-fast:    150ms ease-in-out;
  --transition-default: 220ms ease-in-out;
  --transition-slow:    350ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce:  400ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* =========================================
     Typography
     ========================================= */

  /* 폰트 패밀리 — 우주 컨셉 다이나믹 조합 */
  --font-family-base:     'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-family-heading:  'Space Grotesk', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-family-display:  'Orbitron', 'Space Grotesk', -apple-system, sans-serif;

  /* 텍스트 그림자 — 입체감 레이어 */
  --text-shadow-3d:
    0 1px 0 rgba(255, 255, 255, 0.40),
    0 2px 0 rgba(255, 255, 255, 0.20),
    0 4px 8px rgba(255, 255, 255, 0.10),
    0 8px 24px rgba(255, 255, 255, 0.05);
  --text-shadow-glow:
    0 0 40px rgba(255, 255, 255, 0.30),
    0 0 80px rgba(255, 255, 255, 0.10);
  --text-shadow-glow-soft:
    0 0 20px rgba(255, 255, 255, 0.20),
    0 0 40px rgba(255, 255, 255, 0.08);
  --text-shadow-glow-logo:
    0 0 20px rgba(255, 255, 255, 0.35),
    0 0 40px rgba(255, 255, 255, 0.15);

  /* Font Sizes */
  --font-size-2xs: 0.625rem;   /* 10px */
  --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 — 우주적 고요함을 위해 thin/light 범위 활용 */
  --font-weight-thin:      100;
  --font-weight-light:     300;
  --font-weight-regular:   400;
  --font-weight-medium:    500;
  --font-weight-semibold:  600;
  --font-weight-bold:      700;
  --font-weight-extrabold: 800;

  /* Line Heights */
  --leading-tight:   1.15;
  --leading-snug:    1.3;
  --leading-normal:  1.5;
  --leading-relaxed: 1.7;
  --leading-loose:   1.85;

  /* Letter Spacings */
  --tracking-tighter: -0.04em;
  --tracking-tight:   -0.025em;
  --tracking-normal:  0em;
  --tracking-wide:    0.04em;
  --tracking-wider:   0.08em;
  --tracking-caps:    0.1em;

  /* =========================================
     Layout
     ========================================= */
  --container-max:  1200px;
  --container-wide: 1400px;
  --header-height:  72px;

  /* =========================================
     Shadows — 우주적 깊이감
     ========================================= */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.6);
  --shadow-sm: 0 2px 6px rgba(0, 0, 0, 0.7), 0 1px 2px rgba(0, 0, 0, 0.5);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.8), 0 2px 6px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.85), 0 4px 12px rgba(0, 0, 0, 0.6);
  --shadow-xl: 0 24px 64px rgba(0, 0, 0, 0.9), 0 8px 20px rgba(0, 0, 0, 0.7);

  /* Glow Shadows — 별빛 흰 글로우 */
  --shadow-glow-primary:   0 0 20px rgba(255, 255, 255, 0.10), 0 0 6px rgba(255, 255, 255, 0.06);
  --shadow-glow-secondary: 0 0 20px rgba(200, 200, 200, 0.08), 0 0 6px rgba(200, 200, 200, 0.04);
  --shadow-glow-accent:    0 0 20px rgba(221, 221, 221, 0.10), 0 0 6px rgba(221, 221, 221, 0.05);
  --shadow-glow-strong:    0 0 40px rgba(255, 255, 255, 0.16), 0 8px 32px rgba(0, 0, 0, 0.8);

  /* =========================================
     Gradients — 모노크롬 우주 팔레트
     ========================================= */
  --gradient-primary: linear-gradient(135deg, #FFFFFF 0%, #AAAAAA 100%);
  --gradient-accent:  linear-gradient(135deg, #DDDDDD 0%, #888888 100%);
  --gradient-warm:    linear-gradient(135deg, #CCCCCC 0%, #555555 100%);

  /* Text Gradient — 흰빛에서 은회색으로 흐르는 shimmer */
  --gradient-text: linear-gradient(135deg, #FFFFFF 0%, #AAAAAA 50%, #FFFFFF 100%);
  --gradient-text-shimmer: linear-gradient(
    110deg,
    #FFFFFF 0%,
    #DDDDDD 20%,
    #AAAAAA 40%,
    #FFFFFF 60%,
    #CCCCCC 80%,
    #FFFFFF 100%
  );

  /* Background Gradients */
  --gradient-hero:         radial-gradient(ellipse 80% 60% at 50% 0%, rgba(255, 255, 255, 0.04) 0%, rgba(255, 255, 255, 0.01) 50%, transparent 100%);
  --gradient-hero-bottom:  linear-gradient(180deg, transparent 0%, var(--color-bg-base) 100%);
  --gradient-section-top:  linear-gradient(180deg, var(--color-bg-base) 0%, transparent 100%);
  --gradient-card-shine:   linear-gradient(135deg, rgba(255,255,255,0.03) 0%, transparent 60%);
  --gradient-surface-edge: linear-gradient(180deg, rgba(255,255,255,0.04) 0%, rgba(255,255,255,0.01) 100%);

  /* =========================================
     Z-Index Scale
     ========================================= */
  --z-base:    0;
  --z-raised:  10;
  --z-overlay: 100;
  --z-modal:   200;
  --z-header:  1000;
  --z-top:     9999;
}
