/* ==================== Variables ==================== */
:root {
    /* Light Mode - Black & White + Iridescent Glass */
    --bg-primary: #f5f5f5;
    --bg-secondary: #ebebeb;
    --text-primary: #0a0a0a;
    --text-secondary: #555555;
    --border-color: rgba(0, 0, 0, 0.08);
    --card-bg: rgba(255, 255, 255, 0.4);
    --card-shadow: rgba(0, 0, 0, 0.08);

    /* Glass Effect */
    --glass-bg: rgba(255, 255, 255, 0.35);
    --glass-border: rgba(255, 255, 255, 0.5);
    --glass-blur: 20px;

    /* Monochrome Gradient */
    --gradient-start: #1a1a1a;
    --gradient-mid: #444444;
    --gradient-end: #777777;
    --gradient: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-mid) 50%, var(--gradient-end) 100%);

    /* Accent */
    --accent: #555555;
    --accent-light: #888888;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;

    /* Transitions */
    --transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    --bg-primary: #0a0a0a;
    --bg-secondary: #141414;
    --text-primary: #f5f5f5;
    --text-secondary: #999999;
    --border-color: rgba(255, 255, 255, 0.08);
    --card-bg: rgba(255, 255, 255, 0.06);
    --card-shadow: rgba(0, 0, 0, 0.4);

    /* Glass Effect - Dark */
    --glass-bg: rgba(255, 255, 255, 0.06);
    --glass-border: rgba(255, 255, 255, 0.1);

    /* Monochrome Gradient - Dark */
    --gradient-start: #ffffff;
    --gradient-mid: #cccccc;
    --gradient-end: #888888;
}

/* ==================== Reset & Base ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    font-weight: 400;
    font-size: 18px;
    transition: background-color 0.3s ease, color 0.3s ease;
    overflow-x: hidden;
    word-break: keep-all;
    overflow-wrap: break-word;
}

/* ==================== Background Blobs ==================== */
.bg-blobs {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;
}

.blob {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.25;
}

[data-theme="dark"] .blob {
    opacity: 0.08;
}

.blob-1 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, #d0d0d0, #a0a0a0);
    top: -10%;
    left: -5%;
    animation: blobFloat1 18s ease-in-out infinite;
}

.blob-2 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, #c8c8c8, #999999);
    top: 40%;
    right: -8%;
    animation: blobFloat2 22s ease-in-out infinite;
}

.blob-3 {
    width: 350px;
    height: 350px;
    background: radial-gradient(circle, #d5d5d5, #b0b0b0);
    bottom: -5%;
    left: 30%;
    animation: blobFloat3 20s ease-in-out infinite;
}

@keyframes blobFloat1 {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(60px, 40px) scale(1.1); }
    50% { transform: translate(30px, 80px) scale(0.95); }
    75% { transform: translate(-30px, 50px) scale(1.05); }
}

@keyframes blobFloat2 {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(-50px, 30px) scale(1.05); }
    50% { transform: translate(-80px, -40px) scale(1.1); }
    75% { transform: translate(-30px, -60px) scale(0.95); }
}

@keyframes blobFloat3 {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(40px, -50px) scale(1.08); }
    50% { transform: translate(-30px, -30px) scale(0.95); }
    75% { transform: translate(50px, 20px) scale(1.05); }
}

/* ==================== Container ==================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ==================== Header ==================== */
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--bg-primary);
    border-bottom: none;
    z-index: 1000;
    transition: var(--transition);
}

header.scrolled {
    box-shadow: 0 4px 12px #d0d0d0;
}

[data-theme="dark"] header.scrolled {
    box-shadow: 0 4px 12px #050505;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
}

.logo {
    font-family: 'Pretendard', sans-serif;
    font-size: 1.75rem;
    font-weight: 800;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
}

.nav-menu a {
    font-family: 'Pretendard', sans-serif;
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    transition: var(--transition);
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient);
    transition: width 0.3s ease;
}

.nav-menu a:hover::after {
    width: 100%;
}

/* Header CTA Buttons */
.header-cta {
    display: flex;
    gap: 0.75rem;
    align-items: center;
}

.header-btn {
    padding: 0.5rem 1.25rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
    transition: var(--transition);
    white-space: nowrap;
}

.header-btn-primary {
    background: var(--gradient);
    color: white;
}

.header-btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}

.header-btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.header-btn-secondary:hover {
    border-color: var(--gradient-start);
}

.theme-toggle {
    background: none;
    border: 2px solid var(--border-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    color: var(--text-primary);
}

.theme-toggle:hover {
    border-color: var(--gradient-start);
    transform: rotate(20deg);
}

.sun-icon {
    display: none;
}

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

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

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
}

.mobile-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition);
}

/* ==================== Hero Section ==================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
    position: relative;
    overflow: hidden;
}

/* Cursor Trail Effect (Canvas) */
.cursor-trail-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 9999;
}

@media (max-width: 768px) {
    .cursor-trail-canvas {
        display: none;
    }
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-text {
    animation: fadeInUp 1s ease;
}

.hero-title {
    font-family: 'Pretendard', sans-serif;
    font-size: 5rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.02em;
}

.gradient-text {
    background: linear-gradient(90deg, #1a1a1a 0%, #666666 50%, #1a1a1a 100%);
    background-size: 200% auto;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradientFlow 4s linear infinite;
}

[data-theme="dark"] .gradient-text {
    background: linear-gradient(90deg, #ffffff 0%, #888888 50%, #ffffff 100%);
    background-size: 200% auto;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

[data-theme="dark"] .hero-image::before {
    background: rgba(255, 255, 255, 0.04);
    border-color: rgba(255, 255, 255, 0.08);
}

[data-theme="dark"] .hero-image::after {
    background: radial-gradient(ellipse, rgba(0,0,0,0.4) 0%, transparent 70%);
}

@keyframes gradientFlow {
    0% {
        background-position: 0% center;
    }
    100% {
        background-position: -200% center;
    }
}

.hero-description {
    font-family: 'Pretendard', sans-serif;
    font-size: 1.1rem;
    font-weight: 400;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: flex-end;
    animation: fadeInUp 1s ease 0.2s both;
    position: relative;
}

.hero-image::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 320px;
    height: 320px;
    background: rgba(200, 200, 200, 0.15);
    border: 1px solid rgba(0, 0, 0, 0.06);
    border-radius: 50%;
    z-index: 0;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.hero-image::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 200px;
    height: 20px;
    background: radial-gradient(ellipse, rgba(0,0,0,0.15) 0%, transparent 70%);
    z-index: 0;
}

.hero-image img {
    width: 100%;
    max-width: 400px;
    position: relative;
    z-index: 1;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-20px);
    }
}

/* ==================== Buttons ==================== */
.btn {
    font-family: 'Pretendard', sans-serif;
    display: inline-block;
    padding: 0.875rem 2rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: var(--transition);
    border: 2px solid transparent;
}

.btn-primary {
    background: var(--bg-primary);
    color: var(--text-primary);
    font-weight: 700;
    box-shadow: 4px 4px 12px #d4d4d4, -4px -4px 12px #ffffff, 0 0 6px rgba(0,0,0,0.03);
}

[data-theme="dark"] .btn-primary {
    box-shadow: 4px 4px 12px #060606, -4px -4px 12px #1a1a1a, 0 0 6px rgba(0,0,0,0.1);
}

.btn-primary:hover {
    box-shadow: 6px 6px 16px #cccccc, -6px -6px 16px #ffffff, 0 0 8px rgba(0,0,0,0.04);
}

[data-theme="dark"] .btn-primary:hover {
    box-shadow: 6px 6px 16px #040404, -6px -6px 16px #1e1e1e, 0 0 8px rgba(0,0,0,0.15);
}

.btn-primary:active {
    box-shadow: inset 3px 3px 8px #d0d0d0, inset -3px -3px 8px #ffffff;
}

[data-theme="dark"] .btn-primary:active {
    box-shadow: inset 3px 3px 8px #050505, inset -3px -3px 8px #181818;
}

.btn-secondary {
    background: var(--bg-primary);
    color: var(--text-secondary);
    border: none;
    box-shadow: 3px 3px 8px #d4d4d4, -3px -3px 8px #ffffff, 0 0 4px rgba(0,0,0,0.02);
}

[data-theme="dark"] .btn-secondary {
    box-shadow: 3px 3px 8px #060606, -3px -3px 8px #1a1a1a, 0 0 4px rgba(0,0,0,0.08);
}

.btn-secondary:hover {
    box-shadow: 5px 5px 12px #cccccc, -5px -5px 12px #ffffff, 0 0 6px rgba(0,0,0,0.03);
    color: var(--text-primary);
}

[data-theme="dark"] .btn-secondary:hover {
    box-shadow: 5px 5px 12px #040404, -5px -5px 12px #1e1e1e, 0 0 6px rgba(0,0,0,0.12);
}

.btn-secondary:active {
    box-shadow: inset 2px 2px 6px #d0d0d0, inset -2px -2px 6px #ffffff;
}

[data-theme="dark"] .btn-secondary:active {
    box-shadow: inset 2px 2px 6px #050505, inset -2px -2px 6px #181818;
}

/* ==================== Sections ==================== */
.section {
    padding: var(--spacing-xl) 0;
}

.section-title {
    font-family: 'Pretendard', sans-serif;
    font-size: 4rem;
    font-weight: 800;
    margin-bottom: var(--spacing-sm);
    text-align: center;
    letter-spacing: -0.01em;
    line-height: 1.15;
}

.section-description {
    font-family: 'Pretendard', sans-serif;
    text-align: center;
    color: var(--text-secondary);
    font-size: 1.125rem;
    margin-bottom: var(--spacing-lg);
    font-weight: 400;
}

.section-subtitle {
    font-family: 'Pretendard', sans-serif;
    font-size: 2.5rem;
    font-weight: 700;
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.category-title {
    font-family: 'Pretendard', sans-serif;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--gradient-start);
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border-color);
}

/* ==================== Cards ==================== */
.card {
    background: var(--bg-primary);
    border: none;
    border-radius: 20px;
    padding: var(--spacing-md);
    transition: var(--transition);
    box-shadow: 6px 6px 20px #d4d4d4, -6px -6px 14px #ffffff, 0 0 8px rgba(0,0,0,0.04);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
}

[data-theme="dark"] .card {
    background: var(--bg-primary);
    box-shadow: 6px 6px 20px #060606, -6px -6px 14px #1a1a1a, 0 0 8px rgba(0,0,0,0.15);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 8px 8px 28px #cccccc, -8px -8px 20px #ffffff, 0 0 10px rgba(0,0,0,0.05);
}

[data-theme="dark"] .card:hover {
    box-shadow: 8px 8px 28px #040404, -8px -8px 20px #1e1e1e, 0 0 10px rgba(0,0,0,0.2);
}

.card-title {
    font-family: 'Pretendard', sans-serif;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.card-title svg {
    color: var(--gradient-start);
}

.card-desc {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.card-highlight {
    background: var(--bg-primary);
    color: var(--text-primary);
    border: none;
    position: relative;
    overflow: hidden;
    cursor: pointer;
}

.card-highlight::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(
        135deg,
        transparent 30%,
        rgba(255, 255, 255, 0.2) 50%,
        transparent 70%
    );
    background-size: 200% 200%;
    opacity: 0;
    transition: opacity 0.3s;
    pointer-events: none;
}

.card-highlight:hover::before {
    opacity: 1;
    animation: hologramShine 1.5s ease-out;
}

@keyframes hologramShine {
    0% {
        background-position: 0% 0%;
    }
    100% {
        background-position: 100% 100%;
    }
}

.card-highlight .card-title,
.card-highlight .card-desc {
    color: var(--text-primary);
    position: relative;
    z-index: 1;
}

.card-highlight .card-title svg {
    color: var(--gradient-start);
}

.card-highlight .btn-primary {
    position: relative;
    z-index: 1;
}

/* ==================== About Section ==================== */
.about-text {
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--text-secondary);
}

/* ==================== Resume Section ==================== */
.resume-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto auto auto;
    gap: var(--spacing-md);
}

/* Left column: Education → Skills → Download */
/* Right column: Experience spans all rows */
.resume-grid > .card:first-child {
    grid-column: 1;
    grid-row: 1;
}

.resume-grid > .card-skills {
    grid-column: 1;
    grid-row: 2;
}

.resume-grid > .card-download {
    grid-column: 1;
    grid-row: 3;
}

.resume-grid > .card-experience {
    grid-column: 2;
    grid-row: 1 / -1;
}

.resume-item {
    margin-top: var(--spacing-sm);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.resume-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.school-logo {
    position: absolute;
    bottom: 0;
    right: 0;
    width: 120px;
    height: 120px;
    object-fit: contain;
    opacity: 0.22;
    pointer-events: none;
}

/* Smaller watermark for square emblems that otherwise get clipped (홍익대·청강대) */
.school-logo-sm {
    width: 60px;
    height: 60px;
}

.resume-item h4 {
    font-family: 'Pretendard', sans-serif;
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.resume-period {
    color: var(--gradient-start);
    font-weight: 600;
    font-size: 0.8rem;
    margin-bottom: 0.5rem;
}

.resume-role {
    font-size: 0.78rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.resume-desc {
    color: var(--text-secondary);
    font-size: 0.85rem;
    line-height: 1.55;
    word-break: keep-all;
}

/* Experience Timeline */
.experience-timeline {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.experience-item {
    background: var(--bg-primary);
    border: none;
    border-radius: 15px;
    padding: var(--spacing-md);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    box-shadow: 6px 6px 20px #d4d4d4, -6px -6px 14px #ffffff, 0 0 8px rgba(0,0,0,0.04);
}

[data-theme="dark"] .experience-item {
    background: var(--bg-primary);
    box-shadow: 6px 6px 20px #060606, -6px -6px 14px #1a1a1a, 0 0 8px rgba(0,0,0,0.15);
}

.experience-item:hover {
    transform: translateY(-5px);
    box-shadow: 8px 8px 28px #cccccc, -8px -8px 20px #ffffff, 0 0 10px rgba(0,0,0,0.05);
}

[data-theme="dark"] .experience-item:hover {
    box-shadow: 8px 8px 28px #040404, -8px -8px 20px #1e1e1e, 0 0 10px rgba(0,0,0,0.2);
}

.experience-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.experience-header h4 {
    font-family: 'Pretendard', sans-serif;
    font-size: 1.25rem;
    color: var(--text-primary);
    margin: 0;
    font-weight: 600;
}

.experience-period {
    color: var(--gradient-start);
    font-weight: 600;
    font-size: 0.875rem;
}

.experience-role {
    font-family: 'Pretendard', sans-serif;
    color: var(--text-primary);
    font-weight: 600;
    font-size: 1.1rem;
    margin-bottom: 0.25rem;
    margin-top: 0.5rem;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.experience-team {
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 400;
    margin-bottom: 0.5rem;
    font-style: italic;
}

.experience-project {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-style: italic;
}

/* Awards Section */
.awards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.award-item {
    background: var(--bg-primary);
    border: none;
    border-radius: 15px;
    padding: var(--spacing-md);
    transition: var(--transition);
    box-shadow: 6px 6px 20px #d4d4d4, -6px -6px 14px #ffffff, 0 0 8px rgba(0,0,0,0.04);
}

[data-theme="dark"] .award-item {
    background: var(--bg-primary);
    box-shadow: 6px 6px 20px #060606, -6px -6px 14px #1a1a1a, 0 0 8px rgba(0,0,0,0.15);
}

.award-item:hover {
    transform: translateY(-5px);
    box-shadow: 8px 8px 28px #cccccc, -8px -8px 20px #ffffff, 0 0 10px rgba(0,0,0,0.05);
}

[data-theme="dark"] .award-item:hover {
    box-shadow: 8px 8px 28px #040404, -8px -8px 20px #1e1e1e, 0 0 10px rgba(0,0,0,0.2);
}

.award-item h4 {
    font-family: 'Pretendard', sans-serif;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.award-project {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
    line-height: 1.5;
}

.award-meta {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-bottom: 0.25rem;
    line-height: 1.4;
}

.award-meta a {
    color: var(--accent);
    text-decoration: none;
    transition: color 0.2s ease;
}

.award-meta a:hover {
    color: var(--text-primary);
    text-decoration: underline;
}

.award-date {
    color: var(--gradient-end);
    font-weight: 600;
    font-size: 0.875rem;
}

.award-badge {
    display: inline-block;
    background: var(--gradient);
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.25rem 0.6rem;
    border-radius: 20px;
    margin-left: 0.5rem;
    vertical-align: middle;
}

.award-group .award-subitem {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.award-group .award-subitem:first-of-type {
    margin-top: 0.75rem;
    padding-top: 0;
    border-top: none;
}

/* Skills Card Wide Layout */
.card-wide {
    grid-column: 1 / -1;
}

/* Skills Compact Layout */
.skills-compact {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.skill-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.skill-group-title {
    font-family: 'Pretendard', sans-serif;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.skill-section {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.skill-section-title {
    font-family: 'Pretendard', sans-serif;
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: 0.03em;
    padding-bottom: 0.4rem;
    border-bottom: 1.5px solid var(--border-color);
}

/* Experience Category Divider & Title */
.experience-category {
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
}

.experience-category:first-of-type {
    margin-top: 0.5rem;
}

.experience-category-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: 'Pretendard', sans-serif;
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: 0.03em;
    padding-bottom: 0.4rem;
    border-bottom: 1.5px solid var(--border-color);
}

.experience-category-title svg {
    opacity: 1;
    color: var(--gradient-start);
}

/* ==================== 3ds Max Scripts — compact list ==================== */
.script-list {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.script-row {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.8rem 1.1rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    transition: border-color 0.2s ease, transform 0.2s ease;
}

.script-row:hover {
    border-color: var(--gradient-start);
    transform: translateX(3px);
}

.script-badge {
    flex-shrink: 0;
    font-family: ui-monospace, 'SFMono-Regular', Menlo, Consolas, monospace;
    font-size: 0.66rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    color: var(--gradient-start);
    background: var(--bg-primary);
    padding: 0.28rem 0.55rem;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    white-space: nowrap;
}

.script-title {
    flex-shrink: 0;
    width: 190px;
    margin: 0;
    font-family: 'Pretendard', sans-serif;
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
}

.script-row .portfolio-btn {
    flex-shrink: 0;
    padding: 0.5rem 0.9rem;
    font-size: 0.82rem;
}

/* Push the Max Scripts download button to the right corner (after the desc) */
.script-row > .portfolio-btn {
    order: 1;
    margin-left: auto;
}

.script-desc {
    flex: 1;
    min-width: 0;
    margin: 0;
    font-size: 0.85rem;
    line-height: 1.55;
    color: var(--text-secondary);
}

@media (max-width: 768px) {
    .script-row {
        flex-wrap: wrap;
        gap: 0.5rem 0.7rem;
    }

    .script-title {
        width: auto;
    }

    .script-desc {
        flex-basis: 100%;
        order: 10;
    }
}

/* Info Row (Awards / Publications / Web·App) — shares the script-row look */
.info-row .script-badge {
    align-self: flex-start;
    margin-top: 0.15rem;
    width: 96px;
    display: inline-flex;
    justify-content: center;
    text-align: center;
}

.info-main {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.info-main h4 {
    margin: 0;
    font-family: 'Pretendard', sans-serif;
    font-size: 1rem;
    font-weight: 700;
    line-height: 1.4;
    color: var(--text-primary);
}

.info-main p {
    margin: 0;
    font-size: 0.85rem;
    line-height: 1.55;
    color: var(--text-secondary);
}

.info-main .info-venue {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--gradient-start);
}

.info-main .info-venue svg {
    width: 14px;
    height: 14px;
    flex-shrink: 0;
}

.info-main .info-meta {
    font-size: 0.78rem;
    opacity: 0.85;
}

.info-main .info-meta a {
    color: var(--gradient-start);
    text-decoration: none;
}

.info-main .info-meta a:hover {
    text-decoration: underline;
}

.info-actions {
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0.5rem;
    align-self: center;
    width: 160px;
}

.info-actions .portfolio-btn {
    justify-content: center;
    padding: 0.5rem 0.9rem;
    font-size: 0.82rem;
}

@media (max-width: 768px) {
    .info-actions {
        flex-basis: 100%;
        align-self: stretch;
        width: 100%;
    }
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

/* Skills Grid Layout */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.skills-column {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* Skills Bar System */
.skills-progress-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.skill-category-title {
    font-family: 'Pretendard', sans-serif;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--gradient-start);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border-color);
}

.skill-divider {
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-color), transparent);
    margin: 0.5rem 0;
}

.skill-level-item {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.skill-name {
    font-family: 'Pretendard', sans-serif;
    font-weight: 500;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.skill-bar {
    width: 100%;
    height: 10px;
    background: var(--bg-secondary);
    border-radius: 50px;
    overflow: visible;
    position: relative;
    border: 1px solid var(--border-color);
}

.skill-bar::before,
.skill-bar::after {
    content: '';
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 2px;
    height: 14px;
    background: white;
    z-index: 10;
    border-radius: 1px;
}

[data-theme="dark"] .skill-bar::before,
[data-theme="dark"] .skill-bar::after {
    background: rgba(255, 255, 255, 0.8);
}

.skill-bar::before {
    left: 33.33%;
}

.skill-bar::after {
    left: 66.66%;
}

.skill-bar-fill {
    height: 100%;
    width: 0;
    background: var(--gradient);
    border-radius: 50px;
    transition: width 1.5s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.skill-bar-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.15), transparent);
    animation: shimmer 2.5s infinite;
}

@keyframes shimmer {
    0% {
        transform: translateX(-100%);
    }
    100% {
        transform: translateX(100%);
    }
}

/* ==================== Portfolio Section ==================== */
.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.portfolio-card {
    overflow: hidden;
    padding: 0;
    display: flex;
    flex-direction: column;
    height: 100%;
    transition: var(--transition);
    background: var(--bg-primary);
    border: none;
    border-radius: 20px;
    box-shadow: 6px 6px 20px #d4d4d4, -6px -6px 14px #ffffff, 0 0 8px rgba(0,0,0,0.04);
    position: relative;
}

/* Colorzzle background image */
.colorzzle-card .colorzzle-bg {
    position: absolute;
    bottom: -10px;
    right: -10px;
    width: 65%;
    max-width: 280px;
    opacity: 0.10;
    pointer-events: none;
    z-index: 0;
    filter: grayscale(0.2);
    transition: opacity 0.3s ease;
}

.colorzzle-card:hover .colorzzle-bg {
    opacity: 0.18;
}

[data-theme="dark"] .colorzzle-card .colorzzle-bg {
    opacity: 0.08;
}

[data-theme="dark"] .colorzzle-card:hover .colorzzle-bg {
    opacity: 0.14;
}

.colorzzle-card .portfolio-content {
    position: relative;
    z-index: 1;
}

[data-theme="dark"] .portfolio-card {
    background: var(--bg-primary);
    box-shadow: 6px 6px 20px #060606, -6px -6px 14px #1a1a1a, 0 0 8px rgba(0,0,0,0.15);
}

.portfolio-card:hover {
    transform: translateY(-5px);
    box-shadow: 8px 8px 28px #cccccc, -8px -8px 20px #ffffff, 0 0 10px rgba(0,0,0,0.05);
}

[data-theme="dark"] .portfolio-card:hover {
    box-shadow: 8px 8px 28px #040404, -8px -8px 20px #1e1e1e, 0 0 10px rgba(0,0,0,0.2);
}

/* ==================== 3D Portfolio Cards ==================== */
.portfolio-image-wrapper {
    position: relative;
    width: 100%;
    height: 200px;
    overflow: visible;
}

.portfolio-image-wrapper.portfolio-3d {
    perspective: 800px;
    transform-style: preserve-3d;
    transition: transform 0.15s ease-out;
}

.portfolio-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 20px 20px 0 0;
    transition: transform 0.1s ease-out;
    pointer-events: none;
}

.portfolio-layer-back {
    background: linear-gradient(135deg, rgba(138, 85, 254, 0.4), rgba(92, 223, 230, 0.4));
    border: 2px solid rgba(138, 85, 254, 0.3);
    transform: translateZ(-40px);
    opacity: 0.5;
    box-shadow: 0 10px 30px rgba(138, 85, 254, 0.2);
}

.portfolio-layer-mid {
    background: linear-gradient(135deg, rgba(138, 85, 254, 0.25), rgba(92, 223, 230, 0.25));
    border: 1px solid rgba(92, 223, 230, 0.2);
    transform: translateZ(-20px);
    opacity: 0.6;
    box-shadow: 0 5px 20px rgba(92, 223, 230, 0.15);
}

.portfolio-layer-front {
    position: relative;
    transform: translateZ(0);
    pointer-events: auto;
    z-index: 1;
}

.portfolio-image {
    width: 100%;
    height: 200px;
    overflow: hidden;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #f5f5f5;
}

[data-theme="dark"] .portfolio-image {
    background: #2a2a2a;
}

.portfolio-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-secondary);
    position: relative;
}

.portfolio-placeholder::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 5px;
    height: 60%;
    border-radius: 0 3px 3px 0;
}

.portfolio-gradient-1 .portfolio-placeholder::before {
    background: linear-gradient(180deg, #8a55fe, #b57bff);
}

.portfolio-gradient-2 .portfolio-placeholder::before {
    background: linear-gradient(180deg, #6f9af8, #9fc5ff);
}

.portfolio-gradient-3 .portfolio-placeholder::before {
    background: linear-gradient(180deg, #5cdfe6, #8eeef3);
}

.portfolio-gradient-4 .portfolio-placeholder::before {
    background: linear-gradient(180deg, #ffa726, #ffcc80);
}

.portfolio-gradient-5 .portfolio-placeholder::before {
    background: linear-gradient(180deg, #66bb6a, #a5d6a7);
}

.portfolio-gradient-6 .portfolio-placeholder::before {
    background: linear-gradient(180deg, #5c6bc0, #9fa8da);
}

.portfolio-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.portfolio-card:hover .portfolio-image {
    transform: scale(1.05);
}

.portfolio-content {
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    flex: 1;
}

.portfolio-content h3 {
    font-family: 'Pretendard', sans-serif;
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    position: relative;
    padding-left: 0.75rem;
}

.portfolio-content h3 a {
    color: inherit;
    text-decoration: none;
}

/* Portfolio Actions */
.portfolio-actions {
    margin-top: auto;
    padding-top: var(--spacing-sm);
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.portfolio-btn {
    font-family: 'Pretendard', sans-serif;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 600;
    transition: var(--transition);
    border: 2px solid transparent;
}

.portfolio-btn svg {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

.portfolio-btn-primary {
    background: var(--bg-primary);
    color: var(--text-primary);
    border: none;
    font-weight: 700;
    box-shadow: 4px 4px 12px #d4d4d4, -4px -4px 12px #ffffff, 0 0 6px rgba(0,0,0,0.03);
}

[data-theme="dark"] .portfolio-btn-primary {
    box-shadow: 4px 4px 12px #060606, -4px -4px 12px #1a1a1a, 0 0 6px rgba(0,0,0,0.1);
}

.portfolio-btn-primary:hover {
    box-shadow: 6px 6px 16px #cccccc, -6px -6px 16px #ffffff, 0 0 8px rgba(0,0,0,0.04);
}

[data-theme="dark"] .portfolio-btn-primary:hover {
    box-shadow: 6px 6px 16px #040404, -6px -6px 16px #1e1e1e, 0 0 8px rgba(0,0,0,0.15);
}

.portfolio-btn-primary:active {
    box-shadow: inset 3px 3px 8px #d0d0d0, inset -3px -3px 8px #ffffff;
}

[data-theme="dark"] .portfolio-btn-primary:active {
    box-shadow: inset 3px 3px 8px #050505, inset -3px -3px 8px #181818;
}

.portfolio-btn-secondary {
    background: var(--bg-primary);
    color: var(--text-secondary);
    border: none;
    box-shadow: 3px 3px 8px #d4d4d4, -3px -3px 8px #ffffff, 0 0 4px rgba(0,0,0,0.02);
}

[data-theme="dark"] .portfolio-btn-secondary {
    box-shadow: 3px 3px 8px #060606, -3px -3px 8px #1a1a1a, 0 0 4px rgba(0,0,0,0.08);
}

.portfolio-btn-secondary:hover {
    box-shadow: 5px 5px 12px #cccccc, -5px -5px 12px #ffffff, 0 0 6px rgba(0,0,0,0.03);
    color: var(--text-primary);
}

[data-theme="dark"] .portfolio-btn-secondary:hover {
    box-shadow: 5px 5px 12px #040404, -5px -5px 12px #1e1e1e, 0 0 6px rgba(0,0,0,0.12);
}

.portfolio-btn-secondary:active {
    box-shadow: inset 2px 2px 6px #d0d0d0, inset -2px -2px 6px #ffffff;
}

[data-theme="dark"] .portfolio-btn-secondary:active {
    box-shadow: inset 2px 2px 6px #050505, inset -2px -2px 6px #181818;
}

.portfolio-content h3::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 70%;
    border-radius: 2px;
}

.portfolio-gradient-1 .portfolio-content h3::before {
    background: #8a55fe;
}

.portfolio-gradient-2 .portfolio-content h3::before {
    background: #6f9af8;
}

.portfolio-gradient-3 .portfolio-content h3::before {
    background: #5cdfe6;
}

.portfolio-gradient-4 .portfolio-content h3::before {
    background: #ffa726;
}

.portfolio-gradient-5 .portfolio-content h3::before {
    background: #66bb6a;
}

.portfolio-gradient-6 .portfolio-content h3::before {
    background: #5c6bc0;
}

.portfolio-content p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    line-height: 1.6;
}

.portfolio-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.tag {
    background: var(--text-primary);
    color: var(--bg-primary);
    padding: 0.25rem 0.75rem;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 500;
}

/* ==================== Contact Section ==================== */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.contact-card {
    text-align: center;
}

.contact-card svg {
    color: var(--gradient-start);
    margin-bottom: var(--spacing-sm);
}

.contact-card h3 {
    font-family: 'Pretendard', sans-serif;
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.contact-card p {
    color: var(--text-secondary);
}

/* ==================== Footer ==================== */
footer {
    background: var(--bg-primary);
    padding: var(--spacing-md) 0;
    text-align: center;
}

footer p {
    color: var(--text-secondary);
}

/* ==================== Animations ==================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Stagger animation delays for sequential card appearance */
.experience-item:nth-child(1), .award-item:nth-child(1), .portfolio-card:nth-child(1) { transition-delay: 0s; }
.experience-item:nth-child(2), .award-item:nth-child(2), .portfolio-card:nth-child(2) { transition-delay: 0.1s; }
.experience-item:nth-child(3), .award-item:nth-child(3), .portfolio-card:nth-child(3) { transition-delay: 0.2s; }
.experience-item:nth-child(4), .portfolio-card:nth-child(4) { transition-delay: 0.3s; }
.experience-item:nth-child(5), .portfolio-card:nth-child(5) { transition-delay: 0.4s; }
.experience-item:nth-child(6) { transition-delay: 0.5s; }
.experience-item:nth-child(7) { transition-delay: 0.6s; }
.experience-item:nth-child(8) { transition-delay: 0.7s; }
.experience-item:nth-child(9) { transition-delay: 0.8s; }
.experience-item:nth-child(10) { transition-delay: 0.9s; }

/* ==================== Responsive Design ==================== */
@media (max-width: 1024px) {
    .skills-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        background: var(--bg-primary);
        flex-direction: column;
        padding: var(--spacing-md);
        box-shadow: 0 5px 20px var(--card-shadow);
        transition: left 0.3s ease;
    }

    .nav-menu.active {
        left: 0;
    }

    .header-cta {
        display: none;
    }

    .mobile-toggle {
        display: flex;
    }

    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-title {
        font-size: 3rem;
    }

    .hero-buttons {
        justify-content: center;
    }

    .hero-image {
        order: -1;
    }

    .section-title {
        font-size: 2.5rem;
    }

    .resume-grid,
    .portfolio-grid,
    .contact-grid,
    .awards-grid {
        grid-template-columns: 1fr;
    }

    .resume-grid > .card:first-child,
    .resume-grid > .card-skills,
    .resume-grid > .card-download,
    .resume-grid > .card-experience {
        grid-column: 1;
        grid-row: auto;
    }

    .skills-grid {
        grid-template-columns: 1fr;
    }

    .card-wide {
        grid-column: 1;
    }

    .experience-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .experience-period {
        font-size: 0.8rem;
    }

    .section-subtitle {
        font-size: 1.5rem;
    }

    .container {
        padding: 0 var(--spacing-sm);
    }

    /* Disable 3D effects on mobile for better performance */
    .portfolio-image-wrapper.portfolio-3d {
        perspective: none;
    }

    .portfolio-layer-back,
    .portfolio-layer-mid {
        display: none;
    }

    .portfolio-layer-front {
        transform: none !important;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2.25rem;
    }

    .hero-description {
        font-size: 0.95rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }

    .btn {
        width: 100%;
        text-align: center;
    }
}