/**
 * XPEL Korea Design System
 * Version 2.0
 * 
 * Modern, clean design with proper spacing
 */

/* ==========================================================================
   CSS Custom Properties (Design Tokens)
   ========================================================================== */
:root {
    /* Colors - Primary */
    --color-black: #000000;
    --color-white: #FFFFFF;
    --color-gold: #FDB521;
    --color-gold-dark: #E5A01E;
    --color-gold-light: #d4bc8a;
    
    /* Colors - Neutrals */
    --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;
    
    /* Colors - Semantic */
    --color-success: #22C55E;
    --color-warning: #F59E0B;
    --color-error: #EF4444;
    --color-info: #3B82F6;
    
    /* Typography - Font Families */
    --font-heading: 'Montserrat', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-body: 'Pretendard', -apple-system, BlinkMacSystemFont, sans-serif;
    
    /* Typography - Font Sizes */
    --text-xs: 0.75rem;      /* 12px */
    --text-sm: 0.875rem;     /* 14px */
    --text-base: 1rem;       /* 16px */
    --text-lg: 1.125rem;     /* 18px */
    --text-xl: 1.25rem;      /* 20px */
    --text-2xl: 1.5rem;      /* 24px */
    --text-3xl: 1.875rem;    /* 30px */
    --text-4xl: 2.25rem;     /* 36px */
    --text-5xl: 3rem;        /* 48px */
    --text-6xl: 3.75rem;     /* 60px */
    --text-7xl: 4.5rem;      /* 72px */
    
    /* Typography - Font Weights */
    --font-normal: 400;
    --font-medium: 500;
    --font-semibold: 600;
    --font-bold: 700;
    --font-extrabold: 800;
    
    /* Typography - Line Heights */
    --leading-none: 1;
    --leading-tight: 1.25;
    --leading-snug: 1.375;
    --leading-normal: 1.5;
    --leading-relaxed: 1.625;
    --leading-loose: 2;
    
    /* Spacing */
    --space-0: 0;
    --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-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 */
    
    /* Section Spacing */
    --section-sm: 3rem;      /* 48px */
    --section-md: 4rem;      /* 64px */
    --section-lg: 6rem;      /* 96px */
    --section-xl: 8rem;      /* 128px */
    
    /* Container Widths */
    --container-sm: 640px;
    --container-md: 768px;
    --container-lg: 1024px;
    --container-xl: 1200px;
    --container-2xl: 1400px;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-2xl: 24px;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --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-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
    
    /* Z-Index Scale */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal-backdrop: 400;
    --z-modal: 500;
    --z-popover: 600;
    --z-tooltip: 700;
    
    /* Header */
    --header-height: 80px;
    --header-height-scrolled: 70px;
}

/* ==========================================================================
   Base Reset & Typography
   ========================================================================== */
*,
*::before,
*::after {
    box-sizing: border-box;
}

/* SVG & Icon Base Styles */
svg {
    display: inline-block;
    vertical-align: middle;
}

svg:not([width]):not([class*="icon"]) {
    max-width: 100%;
    height: auto;
}

.icon {
    width: 1em;
    height: 1em;
    display: inline-block;
    vertical-align: middle;
    fill: none;
    stroke: currentColor;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
    flex-shrink: 0;
}

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

body {
    margin: 0;
    padding: 0;
    font-family: var(--font-body);
    font-size: var(--text-base);
    font-weight: var(--font-normal);
    line-height: var(--leading-normal);
    color: var(--color-gray-900);
    background-color: #171717;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: var(--font-bold);
    line-height: var(--leading-tight);
    margin: 0 0 var(--space-4) 0;
    color: var(--color-black);
}

h1 { font-size: clamp(var(--text-3xl), 5vw, var(--text-5xl)); }
h2 { font-size: clamp(var(--text-2xl), 4vw, var(--text-4xl)); }
h3 { font-size: clamp(var(--text-xl), 3vw, var(--text-2xl)); }
h4 { font-size: var(--text-xl); }
h5 { font-size: var(--text-lg); }
h6 { font-size: var(--text-base); }

p {
    margin: 0 0 var(--space-4) 0;
    line-height: var(--leading-relaxed);
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ==========================================================================
   Layout Utilities
   ========================================================================== */
.container {
    width: 100%;
    max-width: var(--container-xl);
    margin-inline: auto;
    padding-inline: var(--space-6);
}

.container--wide {
    max-width: var(--container-2xl);
}

.container--narrow {
    max-width: var(--container-md);
}

/* Section Spacing */
.section {
    padding-block: var(--section-md);
}

.section--sm {
    padding-block: var(--section-sm);
}

.section--lg {
    padding-block: var(--section-lg);
}

/* Background Colors */
.bg-white { background-color: var(--color-white); }
.bg-black { background-color: var(--color-black); }
.bg-gray-50 { background-color: var(--color-gray-50); }
.bg-gray-100 { background-color: var(--color-gray-100); }
.bg-gray-900 { background-color: var(--color-gray-900); }
.bg-gold { background-color: var(--color-gold); }

/* Text Colors */
.text-white { color: var(--color-white); }
.text-black { color: var(--color-black); }
.text-gray-500 { color: var(--color-gray-500); }
.text-gray-600 { color: var(--color-gray-600); }
.text-gold { color: var(--color-gold); }

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    font-family: var(--font-body);
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    line-height: 1;
    text-decoration: none;
    border: 2px solid transparent;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.btn--lg {
    padding: var(--space-4) var(--space-8);
    font-size: var(--text-base);
}

.btn--sm {
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-xs);
}

/* Primary Button (Gold) */
.btn--primary {
    background-color: var(--color-gold);
    border-color: var(--color-gold);
    color: var(--color-black);
}

.btn--primary:hover {
    background-color: var(--color-gold-dark);
    border-color: var(--color-gold-dark);
}

/* Secondary Button (Outline Black) */
.btn--secondary {
    background-color: transparent;
    border-color: var(--color-black);
    color: var(--color-black);
}

.btn--secondary:hover {
    background-color: var(--color-black);
    color: var(--color-white);
}

/* Dark Button */
.btn--dark {
    background-color: var(--color-black);
    border-color: var(--color-black);
    color: var(--color-white);
}

.btn--dark:hover {
    background-color: var(--color-gray-800);
    border-color: var(--color-gray-800);
}

/* White Button */
.btn--white {
    background-color: var(--color-white);
    border-color: var(--color-white);
    color: var(--color-black);
}

.btn--white:hover {
    background-color: var(--color-gray-100);
    border-color: var(--color-gray-100);
}

/* Outline White Button */
.btn--outline-white {
    background-color: transparent;
    border-color: var(--color-white);
    color: var(--color-white);
}

.btn--outline-white:hover {
    background-color: var(--color-white);
    color: var(--color-black);
}

/* Ghost Button */
.btn--ghost {
    background-color: transparent;
    border-color: transparent;
    color: var(--color-gold);
    padding-inline: var(--space-2);
}

.btn--ghost:hover {
    text-decoration: underline;
}

/* ==========================================================================
   Cards
   ========================================================================== */
.card {
    background-color: var(--color-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.card__image {
    aspect-ratio: 16 / 10;
    overflow: hidden;
}

.card__image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.card:hover .card__image img {
    transform: scale(1.05);
}

.card__content {
    padding: var(--space-6);
}

.card__title {
    font-size: var(--text-lg);
    font-weight: var(--font-semibold);
    margin-bottom: var(--space-2);
}

.card__text {
    font-size: var(--text-sm);
    color: var(--color-gray-600);
    margin-bottom: var(--space-4);
}

/* ==========================================================================
   Icons (SVG)
   ========================================================================== */
.icon {
    display: inline-flex;
    width: 24px;
    height: 24px;
    fill: none;
    stroke: currentColor;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.icon--sm {
    width: 16px;
    height: 16px;
}

.icon--lg {
    width: 32px;
    height: 32px;
}

.icon--xl {
    width: 48px;
    height: 48px;
}

/* Feature Icons (filled background) */
.feature-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    border-radius: var(--radius-lg);
    background-color: var(--color-gray-100);
    color: var(--color-gold);
}

.feature-icon .icon {
    width: 32px;
    height: 32px;
}

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

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

@media (max-width: 1024px) {
    .grid--4 { grid-template-columns: repeat(2, 1fr); }
    .grid--3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
    .grid--4,
    .grid--3,
    .grid--2 { grid-template-columns: 1fr; }
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
/* 
 * Mobile First Approach:
 * sm: 640px
 * md: 768px
 * lg: 1024px
 * xl: 1280px
 * 2xl: 1536px
 */

@media (max-width: 1024px) {
    :root {
        --header-height: 70px;
        --section-md: 3rem;
        --section-lg: 4rem;
    }
}

@media (max-width: 768px) {
    :root {
        --section-md: 2.5rem;
        --section-lg: 3rem;
    }
    
    .container {
        padding-inline: var(--space-4);
    }
}

@media (max-width: 640px) {
    :root {
        --section-md: 2rem;
        --section-lg: 2.5rem;
    }
}