/* Reset & Base Styles */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Light Mode Colors (Default) */
    
    /* Primary Brand Colors - Deep Blues for Trust & Innovation */
    --clr-primary-300: hsl(215, 28%, 65%);
    --clr-primary-400: hsl(215, 35%, 45%);
    --clr-primary-500: hsl(215, 42%, 35%);
    --clr-primary-600: hsl(215, 48%, 25%);
    --clr-primary-700: hsl(215, 55%, 18%);
    
    /* Accent Colors - Warm Ruby & Gold for Impact */
    --clr-accent-400: hsl(345, 65%, 58%);
    --clr-accent-500: hsl(345, 70%, 48%);
    --clr-accent-600: hsl(345, 75%, 38%);
    --clr-gold-400: hsl(40, 85%, 68%);
    --clr-gold-500: hsl(40, 90%, 58%);
    
    /* Light Mode Neutral System */
    --clr-neutral-50: hsl(30, 12%, 98%);
    --clr-neutral-100: hsl(30, 10%, 96%);
    --clr-neutral-200: hsl(30, 8%, 92%);
    --clr-neutral-300: hsl(30, 6%, 85%);
    --clr-neutral-400: hsl(30, 5%, 65%);
    --clr-neutral-500: hsl(30, 4%, 45%);
    --clr-neutral-600: hsl(30, 6%, 32%);
    --clr-neutral-700: hsl(30, 8%, 22%);
    --clr-neutral-800: hsl(30, 10%, 15%);
    --clr-neutral-900: hsl(30, 12%, 10%);
    
    /* Light Mode Surface Colors */
    --clr-surface-primary: var(--clr-neutral-50);
    --clr-surface-secondary: var(--clr-neutral-100);
    --clr-surface-tertiary: var(--clr-neutral-200);
    --clr-surface-elevated: var(--clr-neutral-50);
    --clr-surface-dark: var(--clr-neutral-800);
    --clr-surface-darker: var(--clr-neutral-900);
    
    /* Light Mode Text Colors */
    --clr-text-primary: var(--clr-neutral-800);
    --clr-text-secondary: var(--clr-neutral-600);
    --clr-text-tertiary: var(--clr-neutral-500);
    --clr-text-inverse: var(--clr-neutral-50);
    
    /* Light Mode Border Colors */
    --clr-border-primary: var(--clr-neutral-200);
    --clr-border-secondary: var(--clr-neutral-300);
    --clr-border-focus: var(--clr-primary-400);
    
    /* Light Mode Glass Effect */
    --glass-bg: rgba(255, 255, 255, 0.08);
    --glass-border: rgba(255, 255, 255, 0.12);
    
    /* Light Mode Shadows */
    --shadow-s: 0 1px 3px 0 rgba(48, 46, 42, 0.08);
    --shadow-m: 0 4px 8px -2px rgba(48, 46, 42, 0.12), 0 2px 4px -2px rgba(48, 46, 42, 0.08);
    --shadow-l: 0 12px 20px -4px rgba(48, 46, 42, 0.15), 0 4px 8px -4px rgba(48, 46, 42, 0.1);
    --shadow-xl: 0 24px 32px -8px rgba(48, 46, 42, 0.18), 0 8px 16px -8px rgba(48, 46, 42, 0.12);
    
    /* Typography Scale */
    --fs-200: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
    --fs-300: clamp(0.875rem, 0.825rem + 0.25vw, 1rem);
    --fs-400: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
    --fs-500: clamp(1.125rem, 1.05rem + 0.375vw, 1.375rem);
    --fs-600: clamp(1.375rem, 1.25rem + 0.625vw, 1.875rem);
    --fs-700: clamp(1.875rem, 1.625rem + 1.25vw, 2.75rem);
    --fs-800: clamp(2.25rem, 1.875rem + 1.875vw, 3.75rem);
    --fs-900: clamp(3rem, 2.375rem + 3.125vw, 5.5rem);
    
    /* Spacing Scale */
    --space-3xs: clamp(0.25rem, 0.225rem + 0.125vw, 0.3125rem);
    --space-2xs: clamp(0.5rem, 0.475rem + 0.125vw, 0.5625rem);
    --space-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
    --space-s: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
    --space-m: clamp(1.5rem, 1.425rem + 0.375vw, 1.6875rem);
    --space-l: clamp(2rem, 1.9rem + 0.5vw, 2.25rem);
    --space-xl: clamp(3rem, 2.85rem + 0.75vw, 3.375rem);
    --space-2xl: clamp(4rem, 3.8rem + 1vw, 4.5rem);
    --space-3xl: clamp(6rem, 5.7rem + 1.5vw, 6.75rem);
    
    /* Border Radius */
    --radius-s: 6px;
    --radius-m: 10px;
    --radius-l: 16px;
    --radius-xl: 24px;
    
    /* Modern Shadows with Warmth */
    --shadow-s: 0 1px 3px 0 rgba(48, 46, 42, 0.08);
    --shadow-m: 0 4px 8px -2px rgba(48, 46, 42, 0.12), 0 2px 4px -2px rgba(48, 46, 42, 0.08);
    --shadow-l: 0 12px 20px -4px rgba(48, 46, 42, 0.15), 0 4px 8px -4px rgba(48, 46, 42, 0.1);
    --shadow-xl: 0 24px 32px -8px rgba(48, 46, 42, 0.18), 0 8px 16px -8px rgba(48, 46, 42, 0.12);
}

/* Dark Mode Colors */
@media (prefers-color-scheme: dark) {
    :root {
        /* Dark Mode Neutral System - Inverted and adjusted */
        --clr-neutral-50: hsl(220, 15%, 8%);
        --clr-neutral-100: hsl(220, 12%, 12%);
        --clr-neutral-200: hsl(220, 10%, 18%);
        --clr-neutral-300: hsl(220, 8%, 25%);
        --clr-neutral-400: hsl(220, 6%, 45%);
        --clr-neutral-500: hsl(220, 4%, 65%);
        --clr-neutral-600: hsl(30, 8%, 78%);
        --clr-neutral-700: hsl(30, 10%, 88%);
        --clr-neutral-800: hsl(30, 12%, 94%);
        --clr-neutral-900: hsl(30, 15%, 98%);
        
        /* Dark Mode Primary Colors - Slightly brighter for contrast */
        --clr-primary-300: hsl(215, 35%, 75%);
        --clr-primary-400: hsl(215, 40%, 65%);
        --clr-primary-500: hsl(215, 45%, 55%);
        --clr-primary-600: hsl(215, 50%, 45%);
        --clr-primary-700: hsl(215, 55%, 35%);
        
        /* Dark Mode Accent Colors - Adjusted for dark background */
        --clr-accent-400: hsl(345, 70%, 68%);
        --clr-accent-500: hsl(345, 75%, 58%);
        --clr-accent-600: hsl(345, 80%, 48%);
        --clr-gold-400: hsl(40, 90%, 75%);
        --clr-gold-500: hsl(40, 95%, 65%);
        
        /* Dark Mode Surface Colors */
        --clr-surface-primary: var(--clr-neutral-50);
        --clr-surface-secondary: var(--clr-neutral-100);
        --clr-surface-tertiary: var(--clr-neutral-200);
        --clr-surface-elevated: var(--clr-neutral-100);
        --clr-surface-dark: hsl(220, 20%, 6%);
        --clr-surface-darker: hsl(220, 25%, 3%);
        
        /* Dark Mode Text Colors - 수정된 부분 */
        --clr-text-primary: var(--clr-neutral-800);
        --clr-text-secondary: var(--clr-neutral-600);
        --clr-text-tertiary: var(--clr-neutral-500);
        --clr-text-inverse: var(--clr-neutral-900);
        
        /* Dark Mode Border Colors */
        --clr-border-primary: var(--clr-neutral-200);
        --clr-border-secondary: var(--clr-neutral-300);
        --clr-border-focus: var(--clr-primary-400);
        
        /* Dark Mode Glass Effect */
        --glass-bg: rgba(255, 255, 255, 0.06);
        --glass-border: rgba(255, 255, 255, 0.08);
        
        /* Dark Mode Shadows - Deeper and more pronounced */
        --shadow-s: 0 1px 3px 0 rgba(0, 0, 0, 0.3);
        --shadow-m: 0 4px 8px -2px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
        --shadow-l: 0 12px 20px -4px rgba(0, 0, 0, 0.5), 0 4px 8px -4px rgba(0, 0, 0, 0.4);
        --shadow-xl: 0 24px 32px -8px rgba(0, 0, 0, 0.6), 0 8px 16px -8px rgba(0, 0, 0, 0.5);
    }
}

/* Manual Dark Mode Override */
[data-theme="dark"] {
    /* Same dark mode colors as above */
    --clr-neutral-50: hsl(220, 15%, 8%);
    --clr-neutral-100: hsl(220, 12%, 12%);
    --clr-neutral-200: hsl(220, 10%, 18%);
    --clr-neutral-300: hsl(220, 8%, 25%);
    --clr-neutral-400: hsl(220, 6%, 45%);
    --clr-neutral-500: hsl(220, 4%, 65%);
    --clr-neutral-600: hsl(30, 8%, 78%);
    --clr-neutral-700: hsl(30, 10%, 88%);
    --clr-neutral-800: hsl(30, 12%, 94%);
    --clr-neutral-900: hsl(30, 15%, 98%);
    
    --clr-primary-300: hsl(215, 35%, 75%);
    --clr-primary-400: hsl(215, 40%, 65%);
    --clr-primary-500: hsl(215, 45%, 55%);
    --clr-primary-600: hsl(215, 50%, 45%);
    --clr-primary-700: hsl(215, 55%, 35%);
    
    --clr-accent-400: hsl(345, 70%, 68%);
    --clr-accent-500: hsl(345, 75%, 58%);
    --clr-accent-600: hsl(345, 80%, 48%);
    --clr-gold-400: hsl(40, 90%, 75%);
    --clr-gold-500: hsl(40, 95%, 65%);
    
    --clr-surface-primary: var(--clr-neutral-50);
    --clr-surface-secondary: var(--clr-neutral-100);
    --clr-surface-tertiary: var(--clr-neutral-200);
    --clr-surface-elevated: var(--clr-neutral-100);
    --clr-surface-dark: hsl(220, 20%, 6%);
    --clr-surface-darker: hsl(220, 25%, 3%);
    
    /* Dark Mode Text Colors - 수정된 부분 */
    --clr-text-primary: var(--clr-neutral-800);
    --clr-text-secondary: var(--clr-neutral-600);
    --clr-text-tertiary: var(--clr-neutral-500);
    --clr-text-inverse: var(--clr-neutral-900);
    
    --clr-border-primary: var(--clr-neutral-200);
    --clr-border-secondary: var(--clr-neutral-300);
    --clr-border-focus: var(--clr-primary-400);
    
    --glass-bg: rgba(255, 255, 255, 0.06);
    --glass-border: rgba(255, 255, 255, 0.08);
    
    --shadow-s: 0 1px 3px 0 rgba(0, 0, 0, 0.3);
    --shadow-m: 0 4px 8px -2px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
    --shadow-l: 0 12px 20px -4px rgba(0, 0, 0, 0.5), 0 4px 8px -4px rgba(0, 0, 0, 0.4);
    --shadow-xl: 0 24px 32px -8px rgba(0, 0, 0, 0.6), 0 8px 16px -8px rgba(0, 0, 0, 0.5);
}

/* Manual Light Mode Override */
[data-theme="light"] {
    /* Force light mode colors even if system prefers dark */
    --clr-neutral-50: hsl(30, 12%, 98%);
    --clr-neutral-100: hsl(30, 10%, 96%);
    --clr-neutral-200: hsl(30, 8%, 92%);
    --clr-neutral-300: hsl(30, 6%, 85%);
    --clr-neutral-400: hsl(30, 5%, 65%);
    --clr-neutral-500: hsl(30, 4%, 45%);
    --clr-neutral-600: hsl(30, 6%, 32%);
    --clr-neutral-700: hsl(30, 8%, 22%);
    --clr-neutral-800: hsl(30, 10%, 15%);
    --clr-neutral-900: hsl(30, 12%, 10%);
    
    /* Reset primary and accent colors to light mode */
    --clr-primary-300: hsl(215, 28%, 65%);
    --clr-primary-400: hsl(215, 35%, 45%);
    --clr-primary-500: hsl(215, 42%, 35%);
    --clr-primary-600: hsl(215, 48%, 25%);
    --clr-primary-700: hsl(215, 55%, 18%);
    
    --clr-accent-400: hsl(345, 65%, 58%);
    --clr-accent-500: hsl(345, 70%, 48%);
    --clr-accent-600: hsl(345, 75%, 38%);
    --clr-gold-400: hsl(40, 85%, 68%);
    --clr-gold-500: hsl(40, 90%, 58%);
    
    /* Reset other color references */
    --clr-surface-primary: var(--clr-neutral-50);
    --clr-surface-secondary: var(--clr-neutral-100);
    --clr-surface-tertiary: var(--clr-neutral-200);
    --clr-surface-elevated: var(--clr-neutral-50);
    --clr-surface-dark: var(--clr-neutral-800);
    --clr-surface-darker: var(--clr-neutral-900);
    
    --clr-text-primary: var(--clr-neutral-800);
    --clr-text-secondary: var(--clr-neutral-600);
    --clr-text-tertiary: var(--clr-neutral-500);
    --clr-text-inverse: var(--clr-neutral-50);
    
    --clr-border-primary: var(--clr-neutral-200);
    --clr-border-secondary: var(--clr-neutral-300);
    --clr-border-focus: var(--clr-primary-400);
    
    --glass-bg: rgba(255, 255, 255, 0.08);
    --glass-border: rgba(255, 255, 255, 0.12);
    
    --shadow-s: 0 1px 3px 0 rgba(48, 46, 42, 0.08);
    --shadow-m: 0 4px 8px -2px rgba(48, 46, 42, 0.12), 0 2px 4px -2px rgba(48, 46, 42, 0.08);
    --shadow-l: 0 12px 20px -4px rgba(48, 46, 42, 0.15), 0 4px 8px -4px rgba(48, 46, 42, 0.1);
    --shadow-xl: 0 24px 32px -8px rgba(48, 46, 42, 0.18), 0 8px 16px -8px rgba(48, 46, 42, 0.12);
}

/* Theme Toggle Button */
.theme-toggle {
    position: relative;
    background: none;
    border: 2px solid var(--clr-border-primary);
    border-radius: var(--radius-xl);
    padding: var(--space-xs);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    transition: all 0.3s ease;
    background-color: var(--clr-surface-elevated);
}

.theme-toggle:hover {
    border-color: var(--clr-border-focus);
    background-color: var(--clr-surface-secondary);
    transform: scale(1.05);
}

.theme-toggle svg {
    width: 1.25rem;
    height: 1.25rem;
    color: var(--clr-text-secondary);
    transition: all 0.3s ease;
}

.theme-toggle:hover svg {
    color: var(--clr-text-primary);
    transform: rotate(180deg);
}

/* Hide/show icons based on theme */
.theme-toggle .sun-icon {
    display: block;
}

.theme-toggle .moon-icon {
    display: none;
}

[data-theme="dark"] .theme-toggle .sun-icon {
    display: none;
}

[data-theme="dark"] .theme-toggle .moon-icon {
    display: block;
}

/* Base Typography */
body {
    font-family: 'Inter', system-ui, sans-serif;
    font-size: var(--fs-400);
    line-height: 1.6;
    color: var(--clr-text-primary);
    background-color: var(--clr-surface-primary);
    font-feature-settings: 'cv02', 'cv03', 'cv04', 'cv11';
    transition: background-color 0.3s ease, color 0.3s ease;
}

h1, h2, h3, h4, h5, h6 {
    line-height: 1.1;
    font-weight: 600;
    color: var(--clr-text-primary);
}

/* Brand Logo Styles */
.brand {
    display: flex;
    align-items: center;
    gap: var(--space-s);
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: var(--space-s);
    text-decoration: none;
    transition: all 0.3s ease;
}

.brand-logo:hover {
    transform: translateY(-2px);
}

.logo-image {
    width: 2.5rem;
    height: 2.5rem;
    object-fit: contain;
    transition: all 0.3s ease;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}

/* Dark mode logo adjustments */
[data-theme="dark"] .logo-image {
    filter: drop-shadow(0 2px 4px rgba(255, 255, 255, 0.1)) brightness(1.1);
}

.brand-text {
    display: flex;
    flex-direction: column;
    gap: var(--space-3xs);
}

.brand-title {
    font-family: 'JetBrains Mono', monospace;
    font-size: var(--fs-600);
    font-weight: 700;
    color: var(--clr-primary-500);
    margin: 0;
}

.brand-tagline {
    font-size: var(--fs-200);
    color: var(--clr-text-tertiary);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* Hero Logo Background */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
    container-type: inline-size;
    position: relative;
}

.visual-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-m);
    width: 100%;
    max-width: 25rem;
    position: relative;
    z-index: 2;
}

.logo-background {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 1;
    opacity: 0.05;
    pointer-events: none;
}

.hero-logo-bg {
    width: 20rem;
    height: 20rem;
    object-fit: contain;
    animation: logoFloat 8s ease-in-out infinite;
}

@keyframes logoFloat {
    0%, 100% { 
        transform: translate(-50%, -50%) rotate(0deg) scale(1);
        opacity: 0.05;
    }
    50% { 
        transform: translate(-50%, -50%) rotate(5deg) scale(1.05);
        opacity: 0.08;
    }
}

/* Footer Logo Styles - Improved Layout */
.footer-brand {
    display: flex;
    flex-direction: column;
    gap: var(--space-l);
}

.footer-logo {
    display: flex;
    align-items: flex-start;
    gap: var(--space-m);
    margin-bottom: 0;
}

.footer-logo-image {
    width: 3rem;
    height: 3rem;
    object-fit: contain;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2));
    flex-shrink: 0;
}

/* Dark mode footer logo adjustments */
[data-theme="dark"] .footer-logo-image {
    filter: drop-shadow(0 2px 4px rgba(255, 255, 255, 0.1)) brightness(1.2);
}

.footer-brand-text {
    display: flex;
    flex-direction: column;
    gap: var(--space-s);
    flex: 1;
}

.footer-title {
    font-family: 'JetBrains Mono', monospace;
    font-size: var(--fs-600);
    color: var(--clr-text-inverse);
    margin: 0;
    line-height: 1.2;
}

.footer-description {
    color: var(--clr-text-secondary);
    margin: 0;
    line-height: 1.5;
    max-width: 40ch;
}

/* Hero Section */
.hero {
    grid-area: hero;
    background: linear-gradient(135deg, var(--clr-surface-primary) 0%, var(--clr-surface-secondary) 50%, var(--clr-surface-tertiary) 100%);
    container-type: inline-size;
}

.hero-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-2xl);
    align-items: center;
    max-width: 75rem;
    margin-inline: auto;
    padding: var(--space-3xl) var(--space-m);
    min-height: calc(100vh - 5rem);
}

.hero-content {
    display: flex;
    flex-direction: column;
    gap: var(--space-l);
}

.hero-badge {
    align-self: flex-start;
}

.badge-text {
    display: inline-block;
    padding: var(--space-2xs) var(--space-s);
    background: var(--clr-primary-500);
    color: var(--clr-text-inverse);
    border-radius: var(--radius-xl);
    font-size: var(--fs-200);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    box-shadow: var(--shadow-m);
}

.hero-title {
    font-size: var(--fs-800);
    font-weight: 700;
    display: flex;
    flex-direction: column;
    gap: var(--space-2xs);
    color: var(--clr-text-primary);
}

.title-line.highlight {
    background: linear-gradient(135deg, var(--clr-accent-400), var(--clr-gold-500));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: var(--fs-500);
    color: var(--clr-text-tertiary);
    max-width: 50ch;
}

.hero-actions {
    display: flex;
    gap: var(--space-s);
    flex-wrap: wrap;
}

.btn {
    padding: var(--space-s) var(--space-l);
    border-radius: var(--radius-m);
    font-weight: 600;
    font-size: var(--fs-400);
    border: none;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.btn-primary {
    background: linear-gradient(135deg, var(--clr-primary-500), var(--clr-primary-600));
    color: var(--clr-text-inverse);
    box-shadow: var(--shadow-m);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--clr-primary-600), var(--clr-primary-700));
    box-shadow: var(--shadow-l);
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    color: var(--clr-primary-500);
    border: 2px solid var(--clr-primary-500);
}

.btn-outline:hover {
    background: var(--clr-primary-500);
    color: var(--clr-text-inverse);
    border-color: var(--clr-primary-600);
}

.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
    container-type: inline-size;
}

.visual-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-m);
    width: 100%;
    max-width: 25rem;
}

.visual-card {
    aspect-ratio: 1;
    border-radius: var(--radius-l);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'JetBrains Mono', monospace;
    font-weight: 700;
    font-size: var(--fs-600);
    color: var(--clr-neutral-50);
    box-shadow: var(--shadow-l);
    transition: transform 0.3s ease;
    cursor: pointer;
}

.card-1 { background: linear-gradient(135deg, var(--clr-primary-400), var(--clr-primary-600)); }
.card-2 { background: linear-gradient(135deg, var(--clr-accent-400), var(--clr-accent-600)); }
.card-3 { background: linear-gradient(135deg, var(--clr-primary-500), var(--clr-accent-500)); }
.card-4 { background: linear-gradient(135deg, var(--clr-gold-400), var(--clr-gold-500)); }

.visual-card:hover {
    transform: translateY(-4px) scale(1.02);
}

/* Container Queries for Hero */
@container (max-width: 64rem) {
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--space-xl);
    }
    
    .hero-title {
        font-size: var(--fs-700);
    }
}

/* Portfolio Section */
.portfolio {
    grid-area: portfolio;
    padding: var(--space-3xl) 0;
    background: var(--clr-surface-secondary);
    container-type: inline-size;
}

.portfolio-container {
    max-width: 75rem;
    margin-inline: auto;
    padding-inline: var(--space-m);
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-2xl);
}

.section-title {
    font-size: var(--fs-700);
    margin-bottom: var(--space-s);
    color: var(--clr-text-primary);
}

.section-subtitle {
    font-size: var(--fs-500);
    color: var(--clr-text-tertiary);
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(20rem, 100%), 1fr));
    gap: var(--space-l);
}

.project-card {
    background: var(--clr-surface-elevated);
    border-radius: var(--radius-l);
    overflow: hidden;
    box-shadow: var(--shadow-m);
    transition: all 0.3s ease;
    container-type: inline-size;
    border: 1px solid var(--clr-border-primary);
}

.project-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
    border-color: var(--clr-primary-300);
}

.project-card.featured {
    grid-column: span 2;
}

.card-media {
    height: 12rem;
    background: linear-gradient(135deg, var(--clr-primary-400), var(--clr-accent-400));
    position: relative;
    overflow: hidden;
}

.media-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.project-card:hover .media-overlay {
    opacity: 1;
}

.play-button {
    width: 3rem;
    height: 3rem;
    border-radius: 50%;
    background: var(--clr-surface-elevated);
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: transform 0.2s ease;
    box-shadow: var(--shadow-m);
}

.play-button:hover {
    transform: scale(1.1);
    background: var(--clr-accent-400);
}

.play-button svg {
    width: 1rem;
    height: 1rem;
    color: var(--clr-primary-500);
}

.play-button:hover svg {
    color: var(--clr-text-inverse);
}

.card-content {
    padding: var(--space-l);
}

.card-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-s);
}

.meta-tag {
    padding: var(--space-3xs) var(--space-xs);
    background: var(--clr-primary-500);
    color: var(--clr-text-inverse);
    border-radius: var(--radius-s);
    font-size: var(--fs-200);
    font-weight: 500;
}

.meta-date {
    font-size: var(--fs-200);
    color: var(--clr-text-tertiary);
}

.card-title {
    font-size: var(--fs-600);
    margin-bottom: var(--space-s);
    color: var(--clr-text-primary);
}

.card-description {
    color: var(--clr-text-tertiary);
    margin-bottom: var(--space-m);
}

.card-stats {
    display: flex;
    gap: var(--space-l);
}

.stat {
    display: flex;
    flex-direction: column;
    gap: var(--space-3xs);
}

.stat-value {
    font-weight: 700;
    font-size: var(--fs-500);
    color: var(--clr-accent-500);
}

.stat-label {
    font-size: var(--fs-200);
    color: var(--clr-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Container Queries for Portfolio */
@container (max-width: 48rem) {
    .project-card.featured {
        grid-column: span 1;
    }
    
    .portfolio-grid {
        grid-template-columns: 1fr;
    }
}

/* Services Section */
.services {
    grid-area: services;
    padding: var(--space-3xl) 0;
    background: var(--clr-surface-primary);
    container-type: inline-size;
}

.services-container {
    max-width: 75rem;
    margin-inline: auto;
    padding-inline: var(--space-m);
}

.services-flex {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-l);
    justify-content: center;
}

.service-item {
    flex: 1;
    min-width: min(15rem, 100%);
    max-width: 20rem;
    text-align: center;
    padding: var(--space-l);
    background: var(--clr-surface-elevated);
    border: 1px solid var(--clr-border-primary);
    border-radius: var(--radius-l);
    box-shadow: var(--shadow-m);
    transition: all 0.3s ease;
    container-type: inline-size;
}

.service-item:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
    border-color: var(--clr-primary-300);
}

.service-icon {
    width: 3.5rem;
    height: 3.5rem;
    margin: 0 auto var(--space-m);
    padding: var(--space-s);
    background: linear-gradient(135deg, var(--clr-primary-500), var(--clr-primary-600));
    border-radius: var(--radius-m);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-m);
}

.service-icon svg {
    width: 1.5rem;
    height: 1.5rem;
    color: var(--clr-neutral-50);
}

.service-title {
    font-size: var(--fs-500);
    margin-bottom: var(--space-s);
    color: var(--clr-text-primary);
}

.service-description {
    color: var(--clr-text-tertiary);
}

/* About Section */
.about {
    grid-area: about;
    padding: var(--space-3xl) 0;
    background: var(--clr-surface-secondary);
    color: var(--clr-text-primary);
    container-type: inline-size;
}

.about-container {
    max-width: 75rem;
    margin-inline: auto;
    padding-inline: var(--space-m);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-2xl);
    align-items: center;
}

.about-text .section-title {
    color: var(--clr-text-primary);
    margin-bottom: var(--space-l);
}

.about-description {
    font-size: var(--fs-500);
    color: var(--clr-text-secondary);
    margin-bottom: var(--space-xl);
    line-height: 1.7;
}

.achievements {
    display: flex;
    gap: var(--space-l);
    flex-wrap: wrap;
}

.achievement {
    display: flex;
    flex-direction: column;
    gap: var(--space-3xs);
}

.achievement-number {
    font-family: 'JetBrains Mono', monospace;
    font-size: var(--fs-700);
    font-weight: 700;
    color: var(--clr-accent-500);
}

.achievement-label {
    font-size: var(--fs-300);
    color: var(--clr-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.about-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.team-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-m);
    width: 100%;
    max-width: 25rem;
}

.team-stat {
    aspect-ratio: 1;
    background: var(--clr-surface-elevated);
    border-radius: var(--radius-l);
    border: 1px solid var(--clr-border-primary);
    backdrop-filter: blur(12px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    text-align: center;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-m);
}

.team-stat:hover {
    background: var(--clr-surface-tertiary);
    transform: scale(1.05);
    border-color: var(--clr-accent-400);
    box-shadow: var(--shadow-l);
}

.stat-icon {
    font-size: var(--fs-600);
}

.stat-text {
    font-size: var(--fs-200);
    color: var(--clr-text-secondary);
    font-weight: 500;
}

/* Footer */
.footer {
    grid-area: footer;
    background: var(--clr-surface-dark);
    color: var(--clr-text-tertiary);
    container-type: inline-size;
    transition: background-color 0.3s ease;
}

/* Dark mode footer - 더 어두운 배경 강제 적용 */
[data-theme="dark"] .footer {
    background: hsl(220, 25%, 3%) !important;
    border-top: 1px solid hsl(220, 10%, 15%);
}

/* Dark mode footer 텍스트 색상 강제 적용 */
[data-theme="dark"] .footer .footer-title {
    color: hsl(30, 15%, 95%) !important;
}

[data-theme="dark"] .footer .link-title {
    color: hsl(30, 15%, 95%) !important;
}

[data-theme="dark"] .footer .footer-link {
    color: hsl(30, 8%, 78%) !important;
}

[data-theme="dark"] .footer .footer-description {
    color: hsl(30, 8%, 78%) !important;
}

[data-theme="dark"] .footer .footer-bottom {
    color: hsl(30, 8%, 78%) !important;
}

.footer-container {
    max-width: 75rem;
    margin-inline: auto;
    padding: var(--space-2xl) var(--space-m) var(--space-l);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--space-2xl);
    margin-bottom: var(--space-xl);
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: var(--space-m);
}

.footer-logo {
    display: flex;
    align-items: flex-start;
    gap: var(--space-m);
    margin-bottom: 0;
}

.footer-logo-image {
    width: 3rem;
    height: 3rem;
    object-fit: contain;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2));
    flex-shrink: 0;
}

/* Dark mode footer logo adjustments */
[data-theme="dark"] .footer-logo-image {
    filter: drop-shadow(0 2px 4px rgba(255, 255, 255, 0.1)) brightness(1.2);
}

.footer-brand-text {
    display: flex;
    flex-direction: column;
    gap: var(--space-s);
    flex: 1;
}

.footer-title {
    font-family: 'JetBrains Mono', monospace;
    font-size: var(--fs-600);
    color: var(--clr-text-inverse);
    margin: 0;
    line-height: 1.2;
}

.footer-description {
    color: var(--clr-text-secondary);
    margin: 0;
    line-height: 1.5;
    max-width: 40ch;
}

.social-links {
    display: flex;
    gap: var(--space-s);
}

.social-link {
    width: 2.5rem;
    height: 2.5rem;
    background: var(--clr-surface-secondary);
    border: 1px solid var(--clr-border-secondary);
    border-radius: var(--radius-m);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--clr-text-secondary);
    transition: all 0.2s ease;
    backdrop-filter: blur(8px);
}

.social-link:hover {
    background: var(--clr-primary-500);
    color: var(--clr-text-inverse);
    transform: translateY(-2px);
    border-color: var(--clr-primary-400);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(8rem, 1fr));
    gap: var(--space-l);
}

.link-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-s);
}

.link-title {
    font-size: var(--fs-400);
    font-weight: 600;
    color: var(--clr-text-inverse);
    margin-bottom: var(--space-xs);
}

.footer-link {
    color: var(--clr-text-secondary);
    text-decoration: none;
    transition: color 0.2s ease;
}

.footer-link:hover {
    color: var(--clr-accent-400);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--space-l);
    border-top: 1px solid var(--clr-border-secondary);
    color: var(--clr-text-secondary);
    font-size: var(--fs-300);
}

/* Container Queries for Footer - Updated */
@container (max-width: 48rem) {
    .footer-content {
        grid-template-columns: 1fr;
        text-align: left;
        gap: var(--space-xl);
    }
    
    .footer-brand {
        order: -1;
        margin-bottom: var(--space-l);
    }
    
    .social-links {
        justify-content: flex-start;
        margin-top: var(--space-s);
    }
    
    .footer-links {
        grid-template-columns: repeat(2, 1fr);
    }
}

@container (max-width: 30rem) {
    .footer-content {
        text-align: center;
    }
    
    .social-links {
        justify-content: center;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
        gap: var(--space-m);
    }
    
    .link-group {
        text-align: center;
    }
}

/* Responsive Logo Adjustments - Updated Footer */
@container (max-width: 48rem) {
    .brand-logo {
        gap: var(--space-xs);
    }
    
    .logo-image {
        width: 2rem;
        height: 2rem;
    }
    
    .brand-title {
        font-size: var(--fs-500);
    }
    
    .brand-tagline {
        font-size: var(--fs-100);
    }
    
    .hero-logo-bg {
        width: 15rem;
        height: 15rem;
    }
    
    .footer-logo {
        flex-direction: row;
        align-items: center;
        gap: var(--space-s);
        justify-content: flex-start;
    }
    
    .footer-logo-image {
        width: 2.5rem;
        height: 2.5rem;
    }
    
    .footer-brand-text {
        gap: var(--space-xs);
    }
    
    .footer-title {
        font-size: var(--fs-500);
    }
    
    .footer-description {
        font-size: var(--fs-300);
    }
}

@container (max-width: 30rem) {
    .brand-text {
        display: none;
    }
    
    .logo-image {
        width: 2.5rem;
        height: 2.5rem;
    }
    
    .hero-logo-bg {
        width: 12rem;
        height: 12rem;
    }
    
    .footer-logo {
        flex-direction: column;
        align-items: center;
        text-align: center;
        gap: var(--space-s);
    }
    
    .footer-brand-text {
        align-items: center;
        text-align: center;
    }
    
    .footer-description {
        text-align: center;
    }
}

/* Logo Loading States */
.logo-image,
.footer-logo-image,
.hero-logo-bg {
    opacity: 0;
    animation: logoFadeIn 0.6s ease forwards;
}

@keyframes logoFadeIn {
    from {
        opacity: 0;
        transform: scale(0.8);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.hero-logo-bg {
    animation: logoFadeIn 0.6s ease forwards, logoFloat 8s ease-in-out infinite 0.6s;
}

/* Responsive Logo Adjustments */
@container (max-width: 48rem) {
    .brand-logo {
        gap: var(--space-xs);
    }
    
    .logo-image {
        width: 2rem;
        height: 2rem;
    }
    
    .brand-title {
        font-size: var(--fs-500);
    }
    
    .brand-tagline {
        font-size: var(--fs-100);
    }
    
    .hero-logo-bg {
        width: 15rem;
        height: 15rem;
    }
    
    .footer-logo {
        flex-direction: row;
        align-items: center;
        gap: var(--space-s);
        justify-content: flex-start;
    }
    
    .footer-logo-image {
        width: 2.5rem;
        height: 2.5rem;
    }
    
    .footer-brand-text {
        gap: var(--space-xs);
    }
    
    .footer-title {
        font-size: var(--fs-500);
    }
    
    .footer-description {
        font-size: var(--fs-300);
    }
}

@container (max-width: 30rem) {
    .brand-text {
        display: none;
    }
    
    .logo-image {
        width: 2.5rem;
        height: 2.5rem;
    }
    
    .hero-logo-bg {
        width: 12rem;
        height: 12rem;
    }
    
    .footer-logo {
        flex-direction: column;
        align-items: center;
        text-align: center;
        gap: var(--space-s);
    }
    
    .footer-brand-text {
        align-items: center;
        text-align: center;
    }
    
    .footer-description {
        text-align: center;
    }
}

/* Logo Hover Effects */
.brand-logo:hover .logo-image {
    transform: scale(1.1) rotate(5deg);
}

.footer-logo:hover .footer-logo-image {
    transform: scale(1.1);
}

/* Logo Accessibility */
.logo-image:focus,
.footer-logo-image:focus {
    outline: 2px solid var(--clr-border-focus);
    outline-offset: 2px;
    border-radius: var(--radius-s);
}

/* Logo Error Handling */
.logo-image:not([src]),
.footer-logo-image:not([src]),
.hero-logo-bg:not([src]) {
    display: none;
}

/* Fallback for missing logos */
.logo-image[alt]:after,
.footer-logo-image[alt]:after {
    content: attr(alt);
    display: block;
    width: 100%;
    height: 100%;
    background: var(--clr-primary-500);
    color: var(--clr-text-inverse);
    font-size: var(--fs-200);
    font-weight: 700;
    text-align: center;
    line-height: 1;
    padding: var(--space-xs);
    border-radius: var(--radius-s);
}

/* Print Styles for Logo */
@media print {
    .logo-background,
    .hero-logo-bg {
        display: none;
    }
    
    .logo-image,
    .footer-logo-image {
        filter: none !important;
        -webkit-filter: none !important;
    }
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    .logo-image,
    .footer-logo-image {
        filter: contrast(1.5);
    }
    
    .logo-background {
        display: none;
    }
}

/* Reduced Motion for Logo Animations */
@media (prefers-reduced-motion: reduce) {
    .hero-logo-bg {
        animation: none !important;
    }
    
    .logo-image,
    .footer-logo-image {
        animation: none !important;
        opacity: 1 !important;
        transform: none !important;
    }
    
    .brand-logo:hover .logo-image,
    .footer-logo:hover .footer-logo-image {
        transform: none !important;
    }
}

/* Main Grid Layout */
.main-grid {
    display: grid;
    grid-template-areas: 
        "header"
        "hero"
        "portfolio"
        "services"
        "about"
        "footer";
    min-height: 100vh;
    container-type: inline-size;
}

/* Header */
.header {
    grid-area: header;
    position: sticky;
    top: 0;
    background: rgba(255, 255, 252, 0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--clr-border-primary);
    z-index: 1000;
    container-type: inline-size;
    transition: background-color 0.3s ease;
}

[data-theme="dark"] .header {
    background: rgba(34, 34, 40, 0.95);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-s) var(--space-m);
    max-width: 75rem;
    margin-inline: auto;
}

.brand {
    display: flex;
    flex-direction: column;
    gap: var(--space-3xs);
}

.brand-title {
    font-family: 'JetBrains Mono', monospace;
    font-size: var(--fs-600);
    font-weight: 700;
    color: var(--clr-primary-500);
}

.brand-tagline {
    font-size: var(--fs-200);
    color: var(--clr-text-tertiary);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.nav {
    display: flex;
    align-items: center;
    gap: var(--space-s);
}

.nav-list {
    display: flex;
    list-style: none;
    gap: var(--space-s);
}

.nav-link {
    color: var(--clr-text-secondary);
    text-decoration: none;
    font-weight: 500;
    padding: var(--space-xs) var(--space-s);
    border-radius: var(--radius-m);
    transition: all 0.2s ease;
}

.nav-link:hover {
    color: var(--clr-primary-500);
    background-color: var(--clr-surface-secondary);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 3px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-xs);
}

.nav-toggle span {
    width: 20px;
    height: 2px;
    background: var(--clr-text-secondary);
    transition: all 0.3s ease;
}

/* Container Queries for Header */
@container (max-width: 48rem) {
    .nav-list {
        display: none;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .theme-toggle {
        order: 1;
        margin-right: var(--space-s);
    }
}

/* Privacy Policy Page Styles */
.privacy-policy {
    max-width: 50rem;
    margin: 2rem auto;
    padding: var(--space-l);
    background: var(--clr-surface-elevated);
    border-radius: var(--radius-l);
    box-shadow: var(--shadow-m);
    line-height: 1.7;
}

.privacy-policy h1,
.privacy-policy h2,
.privacy-policy h3,
.privacy-policy strong {
    color: var(--clr-text-primary);
    margin-bottom: var(--space-s);
}

.privacy-policy p {
    color: var(--clr-text-secondary);
    margin-bottom: var(--space-m);
}

.privacy-policy ul {
    margin-left: var(--space-l);
    margin-bottom: var(--space-m);
}

.privacy-policy li {
    color: var(--clr-text-secondary);
    margin-bottom: var(--space-xs);
}

.privacy-policy a {
    color: var(--clr-primary-500);
    text-decoration: none;
    transition: color 0.2s ease;
}

.privacy-policy a:hover {
    color: var(--clr-accent-500);
}

/* Dark mode adjustments for privacy policy */
[data-theme="dark"] .privacy-policy {
    background: var(--clr-surface-elevated);
    border: 1px solid var(--clr-border-primary);
}

/* Utility Classes */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(1rem);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-in {
    animation: fadeInUp 0.6s ease forwards;
}

/* Focus Styles */
:focus-visible {
    outline: 2px solid var(--clr-border-focus);
    outline-offset: 2px;
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}