/* ============================
   Main Portfolio — Toss-Style Light Theme
   Matching AI 로봇 키우기 design
   ============================ */

@import url('https://cdn.jsdelivr.net/gh/orioncactus/pretendard@v1.3.9/dist/web/variable/pretendardvariable.min.css');

:root {
    --color-primary: #3182F6;
    --color-primary-dark: #1B64DA;
    --color-primary-light: #E8F3FF;
    --color-primary-bg: #F0F6FF;

    --color-bg-white: #FFFFFF;
    --color-bg-gray: #F9FAFB;
    --color-bg-light: #F2F4F6;

    --color-text-heading: #191F28;
    --color-text-body: #333D4B;
    --color-text-sub: #6B7684;
    --color-text-muted: #8B95A1;
    --color-text-disabled: #B0B8C1;

    --color-border: #E5E8EB;
    --color-border-light: #F2F4F6;

    --color-green: #34C759;
    --color-orange: #FF9500;
    --color-red: #FF3B30;
    --color-purple: #9333EA;

    --font-sans: 'Pretendard Variable', 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    --space-3xl: 64px;
    --space-4xl: 96px;

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-2xl: 24px;
    --radius-full: 9999px;

    --shadow-sm: 0 1px 4px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 2px 12px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 8px 28px rgba(0, 0, 0, 0.08);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.12);

    --max-width: 1140px;
    --nav-height: 60px;

    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
    --transition-slow: 0.4s ease;
    --ease-out: cubic-bezier(0.4, 0, 0.2, 1);
}

*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: calc(var(--nav-height) + 16px);
    font-size: 16px;
}

body {
    font-family: var(--font-sans);
    background: var(--color-bg-white);
    color: var(--color-text-body);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

::selection {
    background: var(--color-primary-light);
    color: var(--color-primary-dark);
}

a {
    color: inherit;
    text-decoration: none;
}

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

/* ============================
   Navigation
   ============================ */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
    transition: all 0.3s ease;
}

.nav.scrolled {
    border-bottom-color: var(--color-border);
    box-shadow: var(--shadow-sm);
}

.nav-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--space-lg);
    height: var(--nav-height);
}

.nav-logo {
    font-family: var(--font-sans);
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--color-text-heading);
    letter-spacing: -1px;
}

.logo-dot {
    color: var(--color-primary);
}

.nav-links {
    display: flex;
    gap: 0;
}

.nav-link {
    padding: 18px 16px;
    color: var(--color-text-sub);
    font-size: 0.85rem;
    font-weight: 500;
    position: relative;
    transition: color 0.2s;
}

.nav-link:hover {
    color: var(--color-text-heading);
}

.nav-link.active {
    color: var(--color-primary);
    font-weight: 600;
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 24px;
    height: 2px;
    background: var(--color-primary);
    border-radius: 1px;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--color-text-heading);
    border-radius: 2px;
    transition: all 0.3s ease;
}

/* ============================
   Hero
   ============================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: linear-gradient(180deg, var(--color-primary-bg) 0%, var(--color-bg-white) 100%);
    padding-bottom: 3rem;
}

.hero::before {
    content: '';
    position: absolute;
    top: -20%;
    left: 50%;
    transform: translateX(-50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(49, 130, 246, 0.07) 0%, transparent 70%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 2rem;
    max-width: 820px;
}

.hero-profile {
    position: absolute;
    right: clamp(20px, 5vw, 72px);
    bottom: clamp(28px, 6vh, 88px);
    z-index: 1;
    pointer-events: none;
}

.hero-profile-frame {
    width: clamp(150px, 18vw, 220px);
    height: clamp(190px, 22vw, 280px);
    border-radius: 22px;
    overflow: hidden;
    border: 3px solid rgba(255, 255, 255, 0.9);
    box-shadow: 0 18px 48px rgba(49, 130, 246, 0.14), 0 10px 24px rgba(0, 0, 0, 0.08);
    background: rgba(255, 255, 255, 0.55);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transform: rotate(1.5deg);
}

.hero-profile-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center top;
    transform: scale(1.02);
}

.hero-badge {
    display: inline-block;
    padding: 8px 20px;
    background: var(--color-primary-light);
    border-radius: var(--radius-full);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 1.5px;
    color: var(--color-primary);
    margin-bottom: 2rem;
    animation: fadeInDown 0.8s ease;
}

.hero-title {
    margin-bottom: 1.5rem;
    animation: fadeInUp 0.8s ease 0.2s both;
}

.title-accent {
    display: block;
    font-size: clamp(2.5rem, 6vw, 3.8rem);
    font-weight: 800;
    color: var(--color-text-heading);
    line-height: 1.2;
    margin-bottom: 0.5rem;
}

.title-sub {
    display: block;
    font-size: clamp(1rem, 2vw, 1.25rem);
    font-weight: 700;
    color: var(--color-text-sub);
    font-style: italic;
}

.hero-desc {
    font-size: 1.05rem;
    color: var(--color-text-sub);
    line-height: 1.8;
    margin-bottom: 2.5rem;
    animation: fadeInUp 0.8s ease 0.4s both;
}

.hero-cta {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 0.8s ease 0.6s both;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: var(--radius-full);
    font-size: 0.9rem;
    font-weight: 600;
    transition: all 0.25s var(--ease-out);
    cursor: pointer;
    border: none;
    font-family: var(--font-sans);
}

.btn-primary {
    background: var(--color-primary);
    color: #fff;
    box-shadow: 0 4px 14px rgba(49, 130, 246, 0.3);
}

.btn-primary:hover {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(49, 130, 246, 0.4);
}

.btn-outline {
    background: var(--color-bg-white);
    color: var(--color-text-heading);
    border: 1.5px solid var(--color-border);
}

.btn-outline:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    z-index: 1;
    animation: float 2s ease-in-out infinite;
}

.scroll-indicator span {
    font-size: 0.6rem;
    letter-spacing: 3px;
    color: var(--color-text-disabled);
    font-weight: 600;
}

.scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--color-primary), transparent);
    animation: scrollPulse 2s ease-in-out infinite;
}

/* ============================
   Section Common
   ============================ */
.section {
    padding: 100px 0;
}

.section:nth-child(odd) {
    background: var(--color-bg-white);
}

.section:nth-child(even) {
    background: var(--color-bg-gray);
}

.section-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.section-header {
    margin-bottom: 3rem;
}

.section-badge {
    display: inline-block;
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--color-primary);
    padding: 4px 14px;
    background: var(--color-primary-light);
    border-radius: var(--radius-full);
    letter-spacing: 0.5px;
    margin-bottom: var(--space-md);
}

.section-header h2 {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    font-weight: 800;
    color: var(--color-text-heading);
    line-height: 1.3;
    margin-bottom: 0.5rem;
}

.section-subtitle {
    font-size: 1rem;
    color: var(--color-text-sub);
    line-height: 1.7;
}

/* ============================
   About
   ============================ */
.about-intro {
    margin-bottom: 2.5rem;
}

.about-intro p {
    font-size: 0.95rem;
    color: var(--color-text-sub);
    line-height: 1.9;
    padding: 1.5rem 2rem;
    background: var(--color-bg-gray);
    border-radius: var(--radius-lg);
    border-left: 3px solid var(--color-primary);
}

.about-grid {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 48px;
    align-items: start;
}

.about-image-wrapper {
    position: relative;
}

.about-image-wrapper::before {
    content: '';
    position: absolute;
    top: 12px;
    left: 12px;
    width: 100%;
    height: 100%;
    border-radius: var(--radius-xl);
    background: linear-gradient(135deg, var(--color-primary), rgba(49, 130, 246, 0.3));
    z-index: 0;
}

.about-image-frame {
    position: relative;
    z-index: 1;
    width: 280px;
    height: 340px;
    border-radius: var(--radius-xl);
    overflow: hidden;
    border: 3px solid var(--color-bg-white);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1), 0 2px 8px rgba(49, 130, 246, 0.08);
}

.about-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center top;
}

.about-info-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-bottom: 32px;
}

.about-info-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 16px;
    background: var(--color-bg-gray);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border-light);
    transition: all 0.2s ease;
}

.about-info-item:hover {
    background: var(--color-primary-bg);
    border-color: rgba(49, 130, 246, 0.15);
}

.info-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: var(--color-primary-light);
    border-radius: var(--radius-sm);
    color: var(--color-primary);
    flex-shrink: 0;
    margin-top: 2px;
}

.info-label {
    display: block;
    font-size: 0.72rem;
    color: var(--color-text-muted);
    font-weight: 600;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    margin-bottom: 2px;
}

.info-value {
    display: block;
    font-size: 0.9rem;
    color: var(--color-text-heading);
    font-weight: 500;
}

.about-links {
    display: flex;
    gap: 12px;
}

.about-link-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-text-sub);
    transition: all 0.25s var(--ease-out);
}

.about-link-btn:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background: var(--color-primary-bg);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ============================
   Skills
   ============================ */
.skill-section-subtitle {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-text-heading);
    margin-top: 2.5rem;
    margin-bottom: 1.25rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--color-border);
}

.skill-detail-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(480px, 1fr));
    gap: 1.5rem;
}

.skill-detail-card {
    background: var(--color-bg-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: 2rem;
    transition: all 0.3s var(--ease-out);
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}

.skill-detail-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 3px;
    height: 100%;
    background: linear-gradient(180deg, var(--color-primary), rgba(49, 130, 246, 0.2));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.skill-detail-card:hover {
    box-shadow: 0 12px 40px rgba(49, 130, 246, 0.08), 0 4px 12px rgba(0, 0, 0, 0.04);
    transform: translateY(-4px);
    border-color: rgba(49, 130, 246, 0.15);
}

.skill-detail-card:hover::before {
    opacity: 1;
}

.skill-detail-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 1.5rem;
}

.skill-icon-box {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.skill-icon-box.cpp {
    background: linear-gradient(135deg, #00599C, #004482);
    color: #fff;
}

.skill-icon-box.win {
    background: linear-gradient(135deg, #0078D4, #005A9E);
    color: #fff;
}

.skill-icon-box.unity {
    background: linear-gradient(135deg, #222, #333);
    color: #fff;
}

.skill-icon-box.unity .skill-engine-logo,
.skill-icon-box.unreal .skill-engine-logo {
    width: 28px;
    height: 28px;
    object-fit: contain;
    display: block;
}

.skill-icon-box.unreal {
    background: linear-gradient(135deg, #313131, #0E1128);
    color: #fff;
}

.skill-icon-box.ai {
    background: linear-gradient(135deg, #7C3AED, #3182F6);
    color: #fff;
}

.skill-icon-text {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 700;
}

.skill-title-area {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.skill-title-area h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-text-heading);
}

.skill-level-badge {
    display: inline-block;
    width: fit-content;
    padding: 2px 10px;
    border-radius: var(--radius-full);
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.5px;
}

.skill-level-badge.main {
    background: rgba(49, 130, 246, 0.1);
    color: var(--color-primary);
    border: 1px solid rgba(49, 130, 246, 0.2);
}

.skill-level-badge.sub {
    background: rgba(147, 51, 234, 0.08);
    color: var(--color-purple);
    border: 1px solid rgba(147, 51, 234, 0.2);
}

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

.skill-desc-list li {
    position: relative;
    padding-left: 1.2rem;
    font-size: 0.88rem;
    color: var(--color-text-sub);
    line-height: 1.6;
}

.skill-desc-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 9px;
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--color-primary);
    opacity: 0.6;
}

/* Tools Grid */
.tools-badge-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.tool-item {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: var(--color-bg-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-text-sub);
    transition: all 0.25s var(--ease-out);
    box-shadow: var(--shadow-sm);
}

.tool-item:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background: var(--color-primary-bg);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.tool-item svg {
    color: var(--color-text-muted);
    transition: color 0.2s;
}

.tool-item:hover svg {
    color: var(--color-primary);
}

/* ============================
   AI Featured Card
   ============================ */
.ai-featured-card {
    background: var(--color-bg-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: 2.5rem;
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}

.ai-featured-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, #7C3AED, #3182F6, #06B6D4);
}

.ai-featured-header {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    margin-bottom: 2rem;
}

.ai-featured-icon {
    width: 52px;
    height: 52px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, #7C3AED, #3182F6);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    flex-shrink: 0;
}

.ai-featured-title-area {
    flex: 1;
}

.ai-featured-title-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 6px;
}

.ai-featured-title-row h3 {
    font-size: 1.3rem;
    font-weight: 800;
    color: var(--color-text-heading);
}

.ai-featured-desc {
    font-size: 0.9rem;
    color: var(--color-text-sub);
    line-height: 1.7;
}

.ai-category-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-bottom: 2rem;
}

.ai-category-card {
    padding: 1.5rem;
    background: var(--color-bg-gray);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    transition: all 0.25s var(--ease-out);
}

.ai-category-card:hover {
    background: var(--color-primary-bg);
    border-color: rgba(49, 130, 246, 0.15);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.ai-category-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    background: var(--color-primary-light);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary);
    margin-bottom: 12px;
}

.ai-category-card:nth-child(2) .ai-category-icon {
    background: rgba(124, 58, 237, 0.1);
    color: #7C3AED;
}

.ai-category-card:nth-child(3) .ai-category-icon {
    background: rgba(6, 182, 212, 0.1);
    color: #0891B2;
}

.ai-category-card h4 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-text-heading);
    margin-bottom: 10px;
}

.ai-category-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.ai-category-list li {
    position: relative;
    padding-left: 1rem;
    font-size: 0.84rem;
    color: var(--color-text-sub);
    line-height: 1.6;
}

.ai-category-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 9px;
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: var(--color-primary);
    opacity: 0.5;
}

.ai-category-card:nth-child(2) .ai-category-list li::before {
    background: #7C3AED;
}

.ai-category-card:nth-child(3) .ai-category-list li::before {
    background: #0891B2;
}

/* AI Pipeline */
.ai-pipeline {
    padding: 1.5rem 2rem;
    background: var(--color-bg-gray);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    margin-bottom: 2rem;
}

.ai-pipeline-title {
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--color-text-muted);
    letter-spacing: 0.5px;
    text-transform: uppercase;
    margin-bottom: 1.25rem;
    text-align: center;
}

.ai-pipeline-steps {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    flex-wrap: wrap;
}

.ai-pipeline-step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    background: var(--color-bg-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: all 0.25s var(--ease-out);
    min-width: 100px;
}

.ai-pipeline-step:hover {
    border-color: var(--color-primary);
    box-shadow: 0 4px 14px rgba(49, 130, 246, 0.12);
    transform: translateY(-2px);
}

.ai-step-icon {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    background: var(--color-primary-light);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary);
}

.ai-step-label {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--color-text-sub);
    white-space: nowrap;
}

.ai-pipeline-arrow {
    color: var(--color-text-disabled);
    display: flex;
    align-items: center;
    flex-shrink: 0;
}

/* AI Problem Solving Cases */
.ai-cases-section {
    margin-bottom: 2rem;
}

.ai-cases-header {
    margin-bottom: 1.5rem;
}

.ai-cases-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-text-heading);
    margin-bottom: 6px;
}

.ai-cases-title svg {
    color: var(--color-primary);
    flex-shrink: 0;
}

.ai-cases-desc {
    font-size: 0.88rem;
    color: var(--color-text-sub);
    line-height: 1.6;
}

.ai-cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

.ai-case-card {
    position: relative;
    padding: 1.5rem;
    background: var(--color-bg-gray);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    gap: 10px;
    transition: all 0.25s var(--ease-out);
}

.ai-case-card:hover {
    background: var(--color-bg-white);
    border-color: rgba(49, 130, 246, 0.2);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.ai-case-highlight {
    background: linear-gradient(135deg, rgba(49, 130, 246, 0.04), rgba(124, 58, 237, 0.04));
    border-color: rgba(49, 130, 246, 0.15);
    grid-column: 1 / -1;
}

.ai-case-highlight:hover {
    border-color: rgba(49, 130, 246, 0.3);
    box-shadow: 0 8px 28px rgba(49, 130, 246, 0.1);
}

.ai-case-badge {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    width: fit-content;
    padding: 3px 10px;
    border-radius: var(--radius-full);
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.3px;
    background: rgba(49, 130, 246, 0.08);
    color: var(--color-primary);
    border: 1px solid rgba(49, 130, 246, 0.15);
}

.ai-case-badge svg {
    flex-shrink: 0;
}

.case-badge-auto {
    background: rgba(6, 182, 212, 0.08);
    color: #0891B2;
    border-color: rgba(6, 182, 212, 0.2);
}

.case-badge-deploy {
    background: rgba(52, 199, 89, 0.08);
    color: #1B8A3A;
    border-color: rgba(52, 199, 89, 0.2);
}

.case-badge-fix {
    background: rgba(255, 59, 48, 0.08);
    color: #D63031;
    border-color: rgba(255, 59, 48, 0.15);
}

.case-badge-arch {
    background: rgba(124, 58, 237, 0.08);
    color: #7C3AED;
    border-color: rgba(124, 58, 237, 0.15);
}

.case-badge-agent {
    background: rgba(79, 70, 229, 0.08);
    color: #4F46E5;
    border-color: rgba(79, 70, 229, 0.2);
}

.ai-case-title {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--color-text-heading);
    line-height: 1.4;
}

.ai-case-problem {
    font-size: 0.84rem;
    color: var(--color-text-sub);
    line-height: 1.6;
}

.ai-case-result {
    display: flex;
    align-items: baseline;
    gap: 8px;
    padding: 10px 14px;
    background: var(--color-bg-white);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-md);
    font-size: 0.82rem;
    color: var(--color-text-body);
    line-height: 1.6;
}

.ai-case-highlight .ai-case-result {
    background: rgba(255, 255, 255, 0.7);
}

.ai-case-result-label {
    flex-shrink: 0;
    padding: 1px 8px;
    border-radius: var(--radius-full);
    font-size: 0.7rem;
    font-weight: 700;
    background: var(--color-primary);
    color: #fff;
}

.ai-case-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
    margin-top: auto;
}

.ai-case-tags span {
    padding: 2px 8px;
    background: var(--color-bg-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    font-size: 0.7rem;
    font-weight: 500;
    color: var(--color-text-muted);
}

.ai-case-highlight .ai-case-tags span {
    background: rgba(255, 255, 255, 0.6);
}

.ai-case-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    width: fit-content;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--color-primary);
    transition: color 0.2s, gap 0.2s;
}

.ai-case-link:hover {
    color: var(--color-primary-dark);
    gap: 8px;
}

.ai-case-link svg {
    flex-shrink: 0;
}

/* AI Case Card Images */
.ai-case-image {
    position: relative;
    border-radius: var(--radius-md);
    overflow: hidden;
    background: var(--color-bg-white);
    border: 1px solid var(--color-border);
    cursor: zoom-in;
    transition: all 0.3s var(--ease-out);
}

.ai-case-image:hover {
    border-color: rgba(49, 130, 246, 0.3);
    box-shadow: 0 4px 16px rgba(49, 130, 246, 0.08);
}

.ai-case-image img {
    width: 100%;
    height: auto;
    display: block;
    object-fit: cover;
    max-height: 160px;
    transition: transform 0.3s var(--ease-out);
}

.ai-case-image:hover img {
    transform: scale(1.02);
}

.ai-case-image-caption {
    display: block;
    padding: 6px 10px;
    font-size: 0.7rem;
    font-weight: 500;
    color: var(--color-text-muted);
    background: var(--color-bg-light);
    border-top: 1px solid var(--color-border-light);
    text-align: center;
}

/* 실제 캡처가 없는 사례 카드 — 이미지 자리 대신 상단 강조선 */
.ai-case-noimg {
    border-top: 2px solid rgba(49, 130, 246, 0.25);
}

/* Highlight card inner layout */
.ai-case-highlight .ai-case-card-inner {
    display: flex;
    gap: 1.5rem;
    align-items: stretch;
}

.ai-case-highlight .ai-case-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.ai-case-highlight .ai-case-image {
    flex: 0 0 320px;
    align-self: center;
}

.ai-case-highlight .ai-case-image img {
    max-height: 200px;
    object-fit: contain;
    background: #fafbfc;
}

.ai-case-image-top img {
    object-fit: cover;
    object-position: top;
}

.ai-case-highlight .ai-case-image-top img {
    object-fit: cover;
    object-position: top;
}

.ai-case-image-duo {
    display: flex;
    gap: 10px;
    flex: 0 0 380px;
    align-self: stretch;
}

.ai-case-image-duo .ai-case-image {
    flex: 1;
    min-width: 0;
}

.ai-case-image-duo .ai-case-image img {
    max-height: 240px;
}

.ai-case-highlight-stack .ai-case-card-inner {
    flex-direction: column;
}

.ai-case-highlight-stack .ai-case-image {
    flex: none;
    align-self: stretch;
}

.ai-case-image-trio {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    width: 100%;
}

.ai-case-image-trio .ai-case-image img {
    max-height: 200px;
    object-fit: cover;
    object-position: top;
    background: #111318;
}

.ai-case-stages {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px;
}

.ai-case-stages span:not(.ai-case-stage-arrow) {
    padding: 3px 10px;
    border-radius: var(--radius-full);
    font-size: 0.72rem;
    font-weight: 600;
    color: #0891B2;
    background: rgba(6, 182, 212, 0.08);
    border: 1px solid rgba(6, 182, 212, 0.18);
}

.ai-case-stage-arrow {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-muted);
}

/* AI Tools */
.ai-tools-section {
    border-top: 1px solid var(--color-border-light);
    padding-top: 1.5rem;
}

.ai-tools-title {
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--color-text-muted);
    letter-spacing: 0.5px;
    text-transform: uppercase;
    margin-bottom: 1rem;
}

.ai-tools-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.ai-tool-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    background: var(--color-bg-gray);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--color-text-sub);
    transition: all 0.25s var(--ease-out);
}

.ai-tool-badge:hover {
    border-color: rgba(124, 58, 237, 0.3);
    color: #7C3AED;
    background: rgba(124, 58, 237, 0.06);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.ai-tool-badge svg {
    color: var(--color-text-muted);
    transition: color 0.2s;
}

.ai-tool-badge:hover svg {
    color: #7C3AED;
}

/* ============================
   Career Timeline
   ============================ */
.timeline {
    position: relative;
    padding-left: 40px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 7px;
    top: 8px;
    bottom: 8px;
    width: 2px;
    background: linear-gradient(to bottom, var(--color-primary), var(--color-border));
}

.timeline-item {
    position: relative;
    margin-bottom: 28px;
    opacity: 0;
    transform: translateX(-12px);
    transition: opacity 0.3s var(--ease-out), transform 0.3s var(--ease-out);
}

.timeline-item.visible {
    opacity: 1;
    transform: translateX(0);
}

.timeline-marker {
    position: absolute;
    left: -36px;
    top: 16px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--color-bg-white);
    border: 3px solid var(--color-border);
    z-index: 1;
    transition: all 0.3s ease;
}

.timeline-marker.active {
    border-color: var(--color-primary);
    background: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(49, 130, 246, 0.15);
    animation: pulseMarker 2s ease-in-out infinite;
}

.timeline-content {
    background: var(--color-bg-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 20px 24px;
    transition: all 0.25s var(--ease-out);
    box-shadow: var(--shadow-sm);
}

.timeline-link {
    display: block;
    color: inherit;
}

.timeline-link:focus-visible .timeline-content {
    outline: 2px solid rgba(49, 130, 246, 0.35);
    outline-offset: 3px;
}

.timeline-content:hover {
    box-shadow: var(--shadow-md);
    border-color: rgba(49, 130, 246, 0.15);
    transform: translateX(4px);
}

.timeline-meta {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 6px;
}

.timeline-date {
    font-size: 0.78rem;
    color: var(--color-primary);
    font-weight: 600;
}

.timeline-tag {
    display: inline-block;
    padding: 2px 10px;
    border-radius: var(--radius-full);
    font-size: 0.68rem;
    font-weight: 600;
    letter-spacing: 0.3px;
}

.tag-work {
    background: rgba(52, 199, 89, 0.1);
    color: #1B8A3A;
    border: 1px solid rgba(52, 199, 89, 0.2);
}

.tag-edu {
    background: rgba(49, 130, 246, 0.08);
    color: var(--color-primary);
    border: 1px solid rgba(49, 130, 246, 0.2);
}

.tag-project {
    background: rgba(255, 149, 0, 0.08);
    color: #CC7700;
    border: 1px solid rgba(255, 149, 0, 0.2);
}

.tag-activity {
    background: rgba(147, 51, 234, 0.08);
    color: var(--color-purple);
    border: 1px solid rgba(147, 51, 234, 0.2);
}

.timeline-title {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--color-text-heading);
    margin-bottom: 2px;
}

.timeline-desc {
    font-size: 0.85rem;
    color: var(--color-text-sub);
}

/* ============================
   Projects — Subsections
   ============================ */
.project-subsection {
    margin-bottom: 3.5rem;
}

.project-subsection:last-child {
    margin-bottom: 0;
}

.project-subsection-title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-text-heading);
    margin-bottom: 1.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--color-primary-light);
}

.project-subsection-title svg {
    color: var(--color-primary);
    flex-shrink: 0;
}

/* ============================
   Main Project Cards
   ============================ */
.main-project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 1.5rem;
}

.project-card {
    background: var(--color-bg-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: all 0.3s var(--ease-out);
    box-shadow: var(--shadow-sm);
}

.project-card.clickable-card {
    cursor: pointer;
}

.project-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 16px 48px rgba(49, 130, 246, 0.1), 0 4px 12px rgba(0, 0, 0, 0.04);
    border-color: rgba(49, 130, 246, 0.2);
}

.project-thumb {
    position: relative;
    width: 100%;
    height: 220px;
    overflow: hidden;
    background: var(--color-bg-light);
}

.thumb-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.project-card:hover .thumb-image {
    transform: scale(1.03);
}

.thumb-blur-bg {
    position: absolute;
    top: -5%;
    left: -5%;
    right: -5%;
    bottom: -5%;
    background-size: cover;
    background-position: center;
    filter: blur(15px) brightness(0.6);
    transition: transform 0.4s ease;
    z-index: 0;
}

.project-card:hover .thumb-blur-bg {
    transform: scale(1.03);
}

.thumb-image.thumb-contain {
    object-fit: contain;
    position: relative;
    z-index: 1;
}

.thumb-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: linear-gradient(135deg, var(--color-bg-light) 0%, var(--color-bg-gray) 100%);
    color: var(--color-text-disabled);
}

.thumb-coming {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--color-text-muted);
    letter-spacing: 1px;
}

.project-status {
    position: absolute;
    top: 12px;
    right: 12px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 12px;
    border-radius: var(--radius-full);
    font-size: 0.72rem;
    font-weight: 600;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 2;
}

.status-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
}

.project-status.status-active {
    background: rgba(255, 255, 255, 0.9);
    color: var(--color-green);
    border: 1px solid rgba(52, 199, 89, 0.2);
}

.project-status.status-active .status-dot {
    background: var(--color-green);
    animation: pulseMarker 2s ease-in-out infinite;
}

.project-status.status-complete {
    background: rgba(255, 255, 255, 0.9);
    color: var(--color-primary);
    border: 1px solid rgba(49, 130, 246, 0.2);
}

.project-status.status-complete .status-dot {
    background: var(--color-primary);
}

.project-info {
    padding: 1.5rem;
}

.project-info-header {
    margin-bottom: 0.75rem;
}

.project-info-header h3 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--color-text-heading);
    margin-bottom: 4px;
}

.project-period {
    font-size: 0.78rem;
    color: var(--color-primary);
    font-weight: 600;
}

.project-desc {
    font-size: 0.85rem;
    color: var(--color-text-sub);
    line-height: 1.7;
    margin-bottom: 1rem;
}

.project-highlights {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 1rem;
}

.highlight-chip {
    padding: 4px 12px;
    background: var(--color-bg-gray);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-text-sub);
}

.project-tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 1rem;
}

.tech-tag {
    padding: 3px 10px;
    background: var(--color-bg-gray);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 0.72rem;
    color: var(--color-text-sub);
    font-weight: 500;
}

.tech-tag.primary {
    background: var(--color-primary-light);
    border-color: rgba(49, 130, 246, 0.2);
    color: var(--color-primary);
    font-weight: 600;
}

.project-actions {
    display: flex;
    gap: 10px;
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 18px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--color-text-sub);
    transition: all 0.25s var(--ease-out);
}

.project-link:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background: var(--color-primary-bg);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.project-link.primary-link {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: #fff;
    box-shadow: 0 4px 14px rgba(49, 130, 246, 0.3);
}

.project-link.primary-link:hover {
    background: var(--color-primary-dark);
    box-shadow: 0 8px 24px rgba(49, 130, 246, 0.4);
    color: #fff;
}

/* ============================
   Sub Project Cards
   ============================ */
.sub-project-list {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.sub-project-card {
    display: grid;
    grid-template-columns: 280px 1fr;
    background: var(--color-bg-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: all 0.3s var(--ease-out);
    box-shadow: var(--shadow-sm);
}

.sub-project-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
    border-color: rgba(49, 130, 246, 0.15);
}

.sub-project-media {
    position: relative;
    overflow: hidden;
    background: var(--color-bg-light);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

.video-badge {
    position: absolute;
    top: 12px;
    left: 12px;
    z-index: 2;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 7px 12px;
    border-radius: var(--radius-full);
    background: rgba(17, 24, 39, 0.75);
    color: rgba(255, 255, 255, 0.92);
    border: 1px solid rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.2px;
    user-select: none;
}

.video-badge-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #FF3B30;
    box-shadow: 0 0 0 4px rgba(255, 59, 48, 0.18);
}

.sub-thumb-img {
    width: 100%;
    height: auto;
    display: block;
    transition: transform 0.3s ease;
}

.sub-project-card:hover .sub-thumb-img {
    transform: scale(1.03);
}

.play-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 10px;
    background: linear-gradient(180deg, rgba(0, 0, 0, 0.12) 0%, rgba(0, 0, 0, 0.35) 100%);
    opacity: 1;
    transition: background 0.25s ease;
    cursor: pointer;
}

.play-overlay svg {
    filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.3));
    transition: transform 0.2s ease;
}

.play-label {
    font-size: 0.8rem;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.92);
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.35);
    letter-spacing: 0.2px;
}

.sub-project-media:hover .play-overlay {
    background: linear-gradient(180deg, rgba(0, 0, 0, 0.18) 0%, rgba(0, 0, 0, 0.48) 100%);
}

.play-overlay:hover svg {
    transform: scale(1.1);
}

.sub-project-info {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 8px;
}

.sub-project-header {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.sub-project-header h3 {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--color-text-heading);
}

.sub-project-type {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--color-primary);
}

.sub-project-date {
    font-size: 0.72rem;
    color: var(--color-text-muted);
}

.sub-project-info p {
    font-size: 0.85rem;
    color: var(--color-text-sub);
    line-height: 1.6;
}

/* ============================
   Career Technical Section
   ============================ */
.career-tech-card {
    background: var(--color-bg-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: 2.5rem;
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}

.career-tech-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-green));
}

.career-tech-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 1.5rem;
}

.career-company-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-lg);
    background: var(--color-primary-light);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary);
    flex-shrink: 0;
}

.career-tech-header h3 {
    font-size: 1.3rem;
    font-weight: 800;
    color: var(--color-text-heading);
}

.career-position {
    display: block;
    font-size: 0.88rem;
    color: var(--color-text-sub);
    font-weight: 500;
}

.career-date {
    display: block;
    font-size: 0.78rem;
    color: var(--color-primary);
    font-weight: 600;
}

.career-tech-desc {
    font-size: 0.92rem;
    color: var(--color-text-sub);
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.career-tech-highlights {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 1.5rem;
}

.career-highlight-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: var(--color-bg-gray);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border-light);
    transition: all 0.2s ease;
}

.career-highlight-item:hover {
    background: var(--color-primary-bg);
    border-color: rgba(49, 130, 246, 0.15);
    transform: translateX(4px);
}

.career-highlight-item svg {
    color: var(--color-primary);
    flex-shrink: 0;
}

.career-highlight-item span {
    font-size: 0.88rem;
    color: var(--color-text-sub);
    font-weight: 500;
}

/* ============================
   Contact
   ============================ */
.contact-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
    max-width: 960px;
    margin: 0 auto;
}

.contact-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    flex: 1 1 240px;
    max-width: 280px;
    padding: 2rem 1.5rem;
    background: var(--color-bg-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    transition: all 0.25s var(--ease-out);
    box-shadow: var(--shadow-sm);
    text-align: center;
}

.contact-card-static {
    cursor: default;
}

.contact-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(49, 130, 246, 0.1);
}

.contact-icon-box {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background: var(--color-primary-light);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary);
    margin-bottom: 4px;
}

.contact-label {
    font-size: 0.72rem;
    color: var(--color-text-muted);
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.contact-value {
    font-size: 0.82rem;
    color: var(--color-text-sub);
    word-break: keep-all;
    overflow-wrap: anywhere;
    font-weight: 500;
}

/* ============================
   AI image lightbox
   ============================ */
.lightbox-overlay {
    position: fixed;
    inset: 0;
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 48px 24px 32px;
    background: rgba(17, 24, 39, 0.78);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.25s var(--ease-out), visibility 0.25s var(--ease-out);
}

.lightbox-overlay.show {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

.lightbox-content {
    margin: 0;
    max-width: min(1100px, 100%);
    max-height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    transform: scale(0.96);
    transition: transform 0.25s var(--ease-out);
}

.lightbox-overlay.show .lightbox-content {
    transform: scale(1);
}

.lightbox-img {
    display: block;
    max-width: 100%;
    max-height: calc(100vh - 140px);
    width: auto;
    height: auto;
    object-fit: contain;
    border-radius: var(--radius-md);
    background: var(--color-bg-white);
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.28);
}

.lightbox-caption {
    color: #fff;
    font-size: 0.88rem;
    font-weight: 500;
    text-align: center;
}

.lightbox-close {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 44px;
    height: 44px;
    border: none;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.14);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background 0.2s, transform 0.2s;
}

.lightbox-close:hover {
    background: rgba(255, 255, 255, 0.24);
    transform: scale(1.06);
}

.lightbox-close:focus-visible {
    outline: 2px solid #fff;
    outline-offset: 3px;
}

body.lightbox-open {
    overflow: hidden;
}

/* ============================
   Footer
   ============================ */
.footer {
    padding: 2.5rem;
    background: var(--color-bg-light);
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.footer-text {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

/* ============================
   Scroll to Top
   ============================ */
.scroll-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
    border: 1px solid var(--color-border);
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: var(--shadow-lg);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-sub);
    z-index: 99;
    opacity: 0;
    transform: translateY(20px);
    pointer-events: none;
    transition: opacity 0.3s ease, transform 0.3s ease, background 0.2s ease, color 0.2s ease;
}

.scroll-to-top.show {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.scroll-to-top:hover {
    background: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
    box-shadow: 0 8px 24px rgba(49, 130, 246, 0.3);
}

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

@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeTabIn {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes float {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(-8px); }
}

@keyframes scrollPulse {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 1; }
}

@keyframes pulseMarker {
    0%, 100% { box-shadow: 0 0 0 4px rgba(49, 130, 246, 0.15); }
    50% { box-shadow: 0 0 0 8px rgba(49, 130, 246, 0.08); }
}

/* Section reveal */
.section-reveal {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.4s var(--ease-out), transform 0.4s var(--ease-out);
}

.section-reveal.revealed {
    opacity: 1;
    transform: translateY(0);
}

/* ============================
   Scrollbar
   ============================ */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg-gray);
}

::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-disabled);
}

@media (max-width: 1180px) and (min-width: 769px) {
    .nav-link {
        padding: 18px 8px;
        font-size: 0.78rem;
    }
}

/* ============================
   Responsive
   ============================ */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: var(--nav-height);
        left: 0;
        right: 0;
        flex-direction: column;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(20px);
        padding: 16px;
        gap: 0;
        border-bottom: 1px solid var(--color-border);
        box-shadow: var(--shadow-md);
    }

    .nav-links.open {
        display: flex;
    }

    .nav-link {
        padding: 14px 16px;
    }

    .nav-link.active::after {
        display: none;
    }

    .nav-toggle {
        display: flex;
    }

    .section {
        padding: 60px 0;
    }

    .section-inner {
        padding: 0 var(--space-md);
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .about-image-wrapper {
        display: flex;
        justify-content: center;
    }

    .about-image-frame {
        width: 240px;
        height: 300px;
    }

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

    .skill-detail-grid {
        grid-template-columns: 1fr;
    }

    .ai-category-grid {
        grid-template-columns: 1fr;
    }

    .ai-cases-grid {
        grid-template-columns: 1fr;
    }

    .ai-case-highlight {
        grid-column: auto;
    }

    .ai-case-highlight .ai-case-card-inner {
        flex-direction: column;
    }

    .ai-case-highlight .ai-case-image {
        flex: none;
    }

    .ai-case-image-duo {
        flex: none;
        width: 100%;
    }

    .ai-case-image-trio {
        grid-template-columns: 1fr;
    }

    .ai-case-image img {
        max-height: 140px;
    }

    .ai-featured-card {
        padding: 1.5rem;
    }

    .ai-pipeline-steps {
        flex-direction: column;
        gap: 6px;
    }

    .ai-pipeline-step {
        flex-direction: row;
        width: 100%;
        min-width: unset;
        padding: 10px 16px;
    }

    .ai-pipeline-arrow {
        transform: rotate(90deg);
    }

    .main-project-grid {
        grid-template-columns: 1fr;
    }

    .sub-project-card {
        grid-template-columns: 1fr;
    }

    .sub-project-media {
        max-height: 220px;
    }

    .timeline {
        padding-left: 32px;
    }

    .hero-title .title-accent {
        font-size: 2.5rem;
    }

    .hero-profile {
        position: static;
        margin-top: 22px;
        display: flex;
        justify-content: center;
    }

    .hero-profile-frame {
        transform: none;
    }

    .contact-grid {
        display: flex;
    }

    .contact-card {
        max-width: none;
        flex-basis: calc(50% - 0.5rem);
    }

    .career-tech-card {
        padding: 1.5rem;
    }

    .career-tech-header {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .lightbox-overlay {
        padding: 64px 12px 20px;
    }

    .lightbox-close {
        top: 10px;
        right: 10px;
    }

    .contact-grid {
        display: flex;
    }

    .contact-card {
        flex-basis: 100%;
        max-width: none;
    }

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

    .about-image-frame {
        width: 200px;
        height: 260px;
    }

    .hero-cta {
        flex-direction: column;
        align-items: center;
    }
}