:root {
    --bg-color: #1a1a1a;
    --text-color: #ffffff;
    --accent-color: #03C75A;
    --hero-accent-color: #03C75A;
    --card-bg: #2a2a2a;
    --font-main: "Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont, system-ui, Roboto, "Helvetica Neue", "Segoe UI", "Apple SD Gothic Neo", "Noto Sans KR", "Malgun Gothic", "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", sans-serif;
}

[data-theme="light"] {
    --bg-color: #f0f0f0;
    --text-color: #1a1a1a;
    --accent-color: #03C75A;
    --hero-accent-color: #1a1a1a;
    --card-bg: #ffffff;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Theme Toggle */
.theme-toggle {
    background: none;
    border: 1px solid var(--text-color);
    color: var(--text-color);
    padding: 3px 7px;
    border-radius: 20px;
    cursor: pointer;
    margin-left: 14px;
    font-size: 0.6rem;
}

.theme-toggle:hover {
    background-color: var(--text-color);
    color: var(--bg-color);
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-main);
    overflow-x: hidden;
}

/* Header */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 20px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 100;
    mix-blend-mode: difference;
}

[data-theme="light"] header {
    mix-blend-mode: normal;
    background-color: rgba(240, 240, 240, 0.95);
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    color: #000;
}

[data-theme="light"] .logo {
    color: #000;
}

[data-theme="light"] nav a {
    color: #000;
}

[data-theme="light"] .theme-toggle {
    border-color: #000;
    color: #000;
}

.logo {
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

nav {
    display: flex;
    align-items: center;
}

nav a {
    color: var(--text-color);
    text-decoration: none;
    margin-left: 12px;
    font-size: 0.54rem;
    font-weight: 500;
    text-transform: uppercase;
}

/* Hero Section */
.hero {
    position: relative;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

.particles-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    pointer-events: none;
}

.hero-text-container {
    position: relative;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 100%;
}

.hero-text {
    font-size: 12vw;
    line-height: 0.9;
    font-weight: 900;
    font-family: "Arial Black", "Impact", sans-serif;
    text-transform: uppercase;
    color: var(--hero-accent-color);
    white-space: nowrap;
    will-change: transform;
}

.hero-text.outline {
    color: transparent;
    -webkit-text-stroke: 1.5px var(--hero-accent-color);
    paint-order: stroke fill;
}

.hero-letter {
    will-change: transform;
    display: inline-block;
}

/* Section Title */
.section-title {
    font-size: 0.65rem;
    font-weight: 600;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--accent-color);
    margin-top: 0;
    margin-bottom: 16px;
    padding-left: 5px;
    position: relative;
    z-index: 10;
}

/* Content Sections */
.content {
    padding: 0 40px;
    background-color: var(--bg-color);
    max-width: 1100px;
    margin: 0 auto;
    position: relative;
    z-index: 5;
}

.content+.content {
    margin-top: 140px;
}

/* Bento Grid Base */
.bento-grid {
    display: grid;
    gap: 24px;
}

.bento-box {
    position: relative;
    overflow: hidden;
    background-color: var(--card-bg);
    border-radius: 12px;
    padding: 32px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: transform 0.3s ease, background-color 0.3s ease;
}

.bento-box:hover {
    transform: translateY(-6px);
}
.bento-box:hover .bento-bg-img {
    opacity: 0.8;
    transform: scale(1.05);
}

/* =============================================
   About Grid
   ============================================= */
.about-grid {
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: auto;
}

/* Profile Card */
.profile-card {
    grid-column: span 2;
    grid-row: span 2;
    background-color: #000;
    height: 240px;
    /* Fixed height for alignment */
    justify-content: flex-start;
}

[data-theme="light"] .profile-card {
    background-color: #000;
    color: #fff;
}

[data-theme="light"] .profile-card .subtitle {
    color: var(--accent-color);
}

[data-theme="light"] .profile-card .bio {
    color: rgba(255, 255, 255, 0.7);
}

.profile-card h2 {
    font-size: 1.6rem;
    font-weight: 700;
}

.profile-card .subtitle {
    font-size: 0.75rem;
    color: var(--accent-color);
    margin-top: 2px;
}

.profile-card .bio {
    font-size: 0.75rem;
    opacity: 0.7;
    line-height: 1.6;
    margin-top: 6px;
}

.stats {
    display: flex;
    gap: 30px;
    margin-top: auto;
}

.stat-item {
    display: flex;
    flex-direction: column;
}

.stat-item .num {
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--accent-color);
    line-height: 1;
}

.stat-item .label {
    font-size: 0.55rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    margin-top: 2px;
    opacity: 0.6;
}

/* Career Card */
.career-card {
    grid-column: span 2;
    grid-row: span 2;
    height: 240px;
    /* Match profile card height */
}

.career-card h3 {
    font-size: 0.85rem;
    margin-bottom: 10px;
    color: var(--accent-color);
}

.career-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.career-list li {
    display: flex;
    gap: 10px;
    align-items: baseline;
}

.career-list .year {
    font-size: 0.65rem;
    color: var(--accent-color);
    font-weight: 600;
    white-space: nowrap;
    min-width: 85px;
}

.career-list .role {
    font-size: 0.75rem;
    font-weight: 500;
}

/* Skills Card */
.skills-card {
    grid-column: span 2;
    height: 160px;
    /* Fixed height for alignment */
}

.skills-card h3 {
    font-size: 0.85rem;
    margin-bottom: 8px;
    color: var(--accent-color);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.skill-tags span {
    border: 1px solid var(--accent-color);
    color: var(--accent-color);
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.7rem;
    font-weight: 500;
}

/* Tools Card */
.tools-card {
    grid-column: span 2;
    height: 160px;
    /* Match skills card height */
}

.tools-card h3 {
    font-size: 0.85rem;
    margin-bottom: 8px;
    color: var(--accent-color);
}

.tool-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tool-list span {
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 4px 9px;
    border-radius: 8px;
    font-size: 0.65rem;
}

[data-theme="light"] .tool-list span {
    border-color: rgba(0, 0, 0, 0.15);
}

/* =============================================
   Work Grid
   ============================================= */
.work-grid {
    grid-template-columns: repeat(3, 1fr);
}

.project-year {
    font-size: 0.6rem;
    font-weight: 700;
    color: var(--accent-color);
    letter-spacing: 0.05em;
}

.project-info {
    flex: 1;
}

.project-info h3,
.bento-box h3 {
    font-size: 0.85rem;
    font-weight: 600;
    margin-top: 3px;
    margin-bottom: 6px;
}

.bento-box p {
    font-size: 0.7rem;
    opacity: 0.7;
    line-height: 1.5;
}

/* Project Sizes */
.project-large {
    grid-column: span 2;
    min-height: 160px;
}

.project-medium {
    grid-column: span 1;
    min-height: 130px;
}

.project-small {
    grid-column: span 1;
    min-height: 100px;
}

/* Accent Background Projects */
.accent-bg {
    background-color: var(--accent-color);
    color: #000;
}

.accent-bg h3 {
    color: #000;
}

.accent-bg .project-year {
    color: rgba(0, 0, 0, 0.5);
}

.accent-bg p {
    color: #000;
    opacity: 0.7;
}

.accent-bg .result-num {
    color: #000;
}

.accent-bg .result-label {
    color: #000;
    opacity: 0.6;
}

/* Project Result Numbers */
.project-result {
    display: flex;
    align-items: baseline;
    gap: 8px;
    margin-top: auto;
    padding-top: 10px;
}

.result-num {
    font-size: 1.3rem;
    font-weight: 800;
    color: var(--accent-color);
    line-height: 1;
}

.result-label {
    font-size: 0.6rem;
    font-weight: 500;
    opacity: 0.7;
}

.dark-result .result-num {
    color: #000;
}

.dark-result .result-label {
    color: #000;
    opacity: 0.6;
}

/* Project Tags */
.project-tags {
    display: flex;
    gap: 10px;
    margin-top: auto;
}

.project-tags span {
    background-color: rgba(0, 0, 0, 0.15);
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

/* =============================================
   Awards & Talks Grid
   ============================================= */
.awards-grid {
    grid-template-columns: repeat(2, 1fr);
}

.awards-card,
.talks-card {
    min-height: 200px;
}

.awards-card h3,
.talks-card h3 {
    font-size: 0.85rem;
    color: var(--accent-color);
    margin-bottom: 12px;
}

.awards-list,
.talks-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.awards-list li,
.talks-list li {
    font-size: 0.7rem;
    line-height: 1.5;
    display: flex;
    gap: 8px;
    align-items: baseline;
}

.awards-list .year,
.talks-list .year {
    font-size: 0.6rem;
    color: var(--accent-color);
    font-weight: 700;
    white-space: nowrap;
    min-width: 35px;
}

/* =============================================
   Contact Grid
   ============================================= */
.contact-grid {
    grid-template-columns: 2fr 1fr;
}

.contact-card-main {
    background-color: #ffffff;
    color: #000;
    min-height: 120px;
}

.contact-card-main h3 {
    color: #000;
}

.email-link {
    font-size: 1rem;
    font-weight: 700;
    color: #000;
    text-decoration: none;
    margin-top: auto;
}

.email-link:hover {
    color: var(--accent-color);
}

.phone {
    font-size: 0.7rem;
    margin-top: 4px;
    opacity: 0.5;
}

.social-card {
    display: flex;
    flex-direction: column;
}

.social-links {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: auto;
}

.social-links a {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.75rem;
}

.social-links a:hover {
    text-decoration: underline;
}

/* Footer */
footer {
    width: 100%;
    padding: 150px 20px 100px;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin-top: 80px;
}

footer p {
    font-size: 0.9rem;
    opacity: 0.6;
    letter-spacing: 0.05em;
    text-align: center;
}

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

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

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

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

    .profile-card,
    .career-card {
        grid-column: span 2;
    }

    .project-large {
        grid-column: span 2;
    }
}

@media (max-width: 768px) {
    .content {
        padding: 40px 20px;
    }

    .about-grid,
    .work-grid {
        grid-template-columns: 1fr;
    }

    .profile-card,
    .career-card,
    .skills-card,
    .tools-card,
    .project-large,
    .project-medium,
    .project-small {
        grid-column: span 1;
    }

    .hero-text {
        font-size: 15vw;
    }

    header {
        padding: 15px 20px;
    }

    nav a {
        margin-left: 12px;
        font-size: 0.8rem;
    }

    .stat-item .num {
        font-size: 2rem;
    }
}

/* Bento Background Images */
.bento-bg-img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.3;
    z-index: 0;
    transition: opacity 0.4s ease, transform 0.4s ease;
    filter: grayscale(100%) contrast(1.2);
}

.bento-box > * {
    position: relative;
    z-index: 2;
}

.bento-bg-img ~ * {
    text-shadow: 0 2px 10px rgba(0,0,0,0.8);
}

/* Hero Section Updates */
.hero-layout {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    max-width: 1400px;
    padding: 0 5%;
}

.hero-text-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.hero-text {
    font-size: 8vw;
    line-height: 1;
    font-weight: 900;
    font-family: var(--font-main);
    text-transform: uppercase;
    color: var(--hero-accent-color);
    margin: 0;
    display: flex;
    justify-content: center;
    overflow: hidden;
}

.hero-text .char {
    display: inline-block;
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1),
                color 0.3s ease;
    cursor: default;
    will-change: transform;
}

.hero-text .char:hover {
    transform: translateY(-12px) scale(1.1);
    color: #fff;
}

.hero-text.outline .char:hover {
    color: var(--accent-color);
    text-shadow: none;
}

.hero-text.outline {
    color: var(--bg-color);
    text-shadow: 
        -2px -2px 0 var(--hero-accent-color),  
         2px -2px 0 var(--hero-accent-color),
        -2px  2px 0 var(--hero-accent-color),
         2px  2px 0 var(--hero-accent-color),
        -2px  0   0 var(--hero-accent-color),
         2px  0   0 var(--hero-accent-color),
         0   -2px 0 var(--hero-accent-color),
         0    2px 0 var(--hero-accent-color);
}

.hero-subtitle {
    margin-top: 24px;
    font-size: 1rem;
    font-weight: 400;
    letter-spacing: 0.15em;
    color: var(--text-color);
    opacity: 0;
    text-transform: uppercase;
}

.hero-image-container {
    flex: 1;
    height: 70vh;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 0 40px rgba(255, 214, 0, 0.2);
    border: 2px solid var(--accent-color);
}

.hero-main-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

@media (max-width: 768px) {
    .hero-layout {
        flex-direction: column;
        justify-content: center;
        text-align: center;
    }
    .hero-text-container {
        align-items: center;
        margin-bottom: 30px;
    }
    .hero-text {
        font-size: 13vw;
    }
    .hero-image-container {
        width: 100%;
        height: 50vh;
    }
}