/* ============================================
   LongevityCreation Design Tokens
   Version: 1.0.0
   
   이 파일은 프로젝트 전체의 디자인 토큰을 정의합니다.
   모든 CSS 파일에서 이 변수들을 사용해야 합니다.
   ============================================ */

:root {
    /* ============== TYPOGRAPHY ============== */
    --font-sans: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica', sans-serif;
    --font-serif: 'Instrument Serif', Georgia, serif;

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

    /* Font Sizes */
    --text-xs: 11px;
    --text-sm: 13px;
    --text-base: 14px;
    --text-md: 15px;
    --text-lg: 16px;
    --text-xl: 18px;
    --text-2xl: 22px;
    --text-3xl: 28px;
    --text-4xl: 36px;
    --text-5xl: 48px;
    --text-hero: clamp(48px, 9vw, 96px);

    /* Line Heights */
    --leading-tight: 1.1;
    --leading-snug: 1.25;
    --leading-normal: 1.5;
    --leading-relaxed: 1.6;
    --leading-loose: 1.7;

    /* Letter Spacing */
    --tracking-tight: -2px;
    --tracking-normal: 0;
    --tracking-wide: 0.5px;
    --tracking-wider: 1px;
    --tracking-widest: 1.5px;

    /* ============== COLORS - PRIMARY (Brand Blue-Purple) ============== */
    --color-primary: #2952CC;
    --color-primary-light: #E8EEFF;
    --color-primary-dark: #1A2878;
    --color-primary-hover: #4338CA;

    /* Brand Palette */
    --brand-sphere-highlight: #8EA8FF;
    --brand-sphere-mid: #4D6AE8;
    --brand-sphere-deep: #2C42B8;
    --brand-sphere-shadow: #1A2878;
    --brand-text-gradient-start: #2952CC;
    --brand-text-gradient-mid: #4338CA;
    --brand-text-gradient-end: #5B3DC8;

    /* ============== COLORS - NEUTRAL ============== */
    --color-bg: #FAFAFA;
    --color-bg-alt: #F3F4F6;
    --color-bg-white: #FFFFFF;
    --color-bg-dark: #0A0A0A;
    --color-bg-dark-alt: #1a1a2e;

    --color-text: #111827;
    --color-text-secondary: #191919;
    --color-text-muted: #6B7280;
    --color-text-light: #9CA3AF;
    --color-text-inverse: #FFFFFF;

    /* ============== COLORS - SEMANTIC ============== */
    --color-success: #10B981;
    --color-success-bg: #D1FAE5;
    --color-success-text: #065F46;

    --color-warning: #F59E0B;
    --color-warning-bg: #FEF3C7;
    --color-warning-text: #92400E;

    --color-danger: #EF4444;
    --color-danger-bg: #FEE2E2;
    --color-danger-text: #991B1B;

    --color-info: #3B82F6;
    --color-info-bg: #DBEAFE;
    --color-info-text: #1E40AF;

    /* ============== COLORS - BORDER ============== */
    --color-border: #E5E7EB;
    --color-border-light: #F3F4F6;
    --color-border-dark: #D1D5DB;
    --color-border-focus: #2952CC;

    /* ============== SPACING ============== */
    --space-0: 0;
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-8: 32px;
    --space-10: 40px;
    --space-12: 48px;
    --space-16: 64px;
    --space-20: 80px;
    --space-24: 96px;
    --space-30: 120px;

    /* ============== BORDER RADIUS ============== */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-2xl: 20px;
    --radius-3xl: 24px;
    --radius-4xl: 32px;
    --radius-full: 100px;

    /* ============== SHADOWS ============== */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 24px 60px rgba(0, 0, 0, 0.16);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-focus: 0 0 0 3px rgba(41, 82, 204, 0.15);
    --shadow-card: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-card-hover: 0 10px 30px rgba(0, 0, 0, 0.12);

    /* ============== ANIMATION & EASING ============== */
    --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-out: cubic-bezier(0, 0, 0.2, 1);
    --ease-in: cubic-bezier(0.4, 0, 1, 1);

    --duration-instant: 50ms;
    --duration-fast: 150ms;
    --duration-normal: 200ms;
    --duration-slow: 300ms;
    --duration-slower: 500ms;

    /* ============== Z-INDEX ============== */
    --z-base: 0;
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-sidebar: 300;
    --z-header: 400;
    --z-overlay: 500;
    --z-modal: 1000;
    --z-toast: 2000;

    /* ============== LAYOUT ============== */
    --sidebar-width: 220px;
    --sidebar-collapsed-width: 0px;
    --header-height: 72px;
    --container-max-width: 1200px;
    --content-max-width: 800px;
    --card-max-width: 1100px;

    /* ============== BREAKPOINTS (Reference only, use @media) ============== */
    /* sm: 640px, md: 768px, lg: 1024px, xl: 1200px, 2xl: 1400px */
}

/* ============== DARK MODE SUPPORT (Optional) ============== */
@media (prefers-color-scheme: dark) {
    :root.auto-dark {
        --color-bg: #0A0A0A;
        --color-bg-alt: #1F2937;
        --color-bg-white: #111827;
        --color-text: #F9FAFB;
        --color-text-muted: #9CA3AF;
        --color-text-light: #6B7280;
        --color-border: #374151;
        --color-border-light: #1F2937;
    }
}