.quick-nav {
    position: fixed;
    top: 20px;
    left: calc(50% + 100px); 
    transform: translateX(-50%);
    z-index: 1000;
    display: flex;
    gap: 10px;
    padding: 10px 20px;
    background: var(--bg-card);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border: 1px solid var(--border-light);
    border-radius: 50px;
    box-shadow: 0 10px 30px var(--shadow-card);
}

[data-theme='dark'] .quick-nav {
    background: rgba(37, 37, 37, 0.75);
}

@media (min-width: 992px) and (max-width: 1300px) {
    .quick-nav {
        left: calc(50% + 90px); 
    }
}

@media (max-width: 991px) {
    .quick-nav {
        left: 50%; 
        padding: 8px 12px;
        gap: 4px;
    }
}

body {
    background: transparent !important;
    color: var(--text-primary);
    font-family: 'Outfit', 'Noto Sans KR', sans-serif;
    overflow-y: auto;
    overflow-x: hidden;
}

.portfolio-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 100px 20px 400px;
}


.quick-nav .nav-btn {
    padding: 10px 22px;
    border-radius: 25px;
    color: var(--text-muted) !important;
    text-decoration: none;
    font-weight: 700;
    font-size: 0.9rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    background: transparent;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

.quick-nav .nav-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary) !important;
    transform: translateY(-2px);
}

.quick-nav .nav-btn.active {
    background: var(--accent);
    color: #fff !important;
    box-shadow: 0 5px 15px rgba(var(--accent-rgb), 0.35);
}

[data-theme='dark'] .quick-nav .nav-btn.active {
    color: #191919 !important;
}

.card-crack {
    border-color: rgba(255, 140, 0, 0.3);
}

.card-crack:hover {
    box-shadow: 0 20px 50px rgba(255, 140, 0, 0.2);
}

section {
    margin-bottom: 120px;
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease-out;
    scroll-margin-top: 100px;
}

section.visible {
    opacity: 1;
    transform: translateY(0);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 900;
    margin-bottom: 40px;
    text-transform: uppercase;
    letter-spacing: 2px;
    display: flex;
    align-items: center;
    gap: 15px;
    color: var(--text-primary);
}

.section-title::after {
    content: '';
    flex: 1;
    height: 1px;
    background: linear-gradient(90deg, var(--border-light), transparent);
}

.project-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.project-card {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: 16px;
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
    position: relative;
    text-decoration: none;
    color: inherit;
    display: block;
    box-shadow: 0 4px 14px var(--shadow-card);
}

.project-card-image-wrapper {
    position: relative;
    width: 100%;
    aspect-ratio: 4 / 3;
    overflow: hidden;
    background: #1a1a1a;
}

.project-card-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s ease;
}

.project-card:hover {
    transform: translateY(-8px);
    border-color: rgba(var(--accent-rgb), 0.5);
    box-shadow: 0 15px 35px var(--shadow-card);
}

.project-card:hover .project-card-image,
.project-card:hover .bunker-branding-thumb {
    transform: scale(1.08);
}

.bunker-branding-thumb {
    transition: transform 0.6s cubic-bezier(0.165, 0.84, 0.44, 1);
}

.bunker-text {
    display: inline-block;
    transition: transform 0.6s cubic-bezier(0.165, 0.84, 0.44, 1);
}

.project-card:hover .bunker-text {
    transform: scale(1.15);
    text-shadow: 0 0 40px rgba(255, 255, 255, 0.6);
}

.project-card-content {
    padding: 15px;
}

.project-tag {
    font-size: 0.65rem;
    font-weight: 800;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 6px;
    display: block;
}

.project-title {
    font-size: 1.05rem;
    font-weight: 800;
    margin-bottom: 6px;
    color: var(--text-primary);
}

.project-desc {
    font-size: 0.8rem;
    color: var(--text-muted);
    line-height: 1.5;
    margin-bottom: 5px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.details-box {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-light);
    border-radius: 30px;
    padding: 50px;
    line-height: 1.8;
    box-shadow: 0 6px 24px var(--shadow-card);
}

.detail-item {
    margin-bottom: 40px;
}

.detail-item:last-child {
    margin-bottom: 0;
}

.detail-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    flex-wrap: wrap;
    gap: 6px;
}

.detail-title {
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--text-primary);
}

.detail-date {
    color: var(--text-muted);
    font-weight: 600;
    font-size: 0.9rem;
}

.detail-list {
    list-style: none;
    padding: 0;
}

.detail-list li {
    position: relative;
    padding-left: 20px;
    margin-bottom: 10px;
    color: var(--text-secondary);
}

.detail-list li::before {
    content: '▹';
    position: absolute;
    left: 0;
    color: var(--accent);
}


.about-lead {
    font-size: 1.05rem;
    color: var(--text-secondary);
    max-width: 860px;
}

.about-lead strong {
    color: var(--accent);
    font-weight: 800;
}

.pf-stat-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-top: 36px;
}

.pf-stat-tile {
    border: 1px solid var(--border-light);
    border-radius: 20px;
    padding: 22px 24px;
    background: var(--bg-submenu);
    transition: all 0.35s ease;
}

.pf-stat-tile:hover {
    border-color: rgba(var(--accent-rgb), 0.5);
    transform: translateY(-4px);
}

.pf-stat-value {
    font-family: 'Outfit', sans-serif;
    font-size: 2rem;
    font-weight: 900;
    color: var(--accent);
    line-height: 1.2;
}

.pf-stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 4px;
    font-weight: 600;
}


.timeline {
    position: relative;
    padding-left: 26px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 6px;
    top: 8px;
    bottom: 8px;
    width: 2px;
    background: linear-gradient(180deg, rgba(var(--accent-rgb), 0.6), var(--border-light));
    border-radius: 2px;
}

.timeline-item {
    position: relative;
    margin-bottom: 44px;
}

.timeline-item:last-child {
    margin-bottom: 0;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -26px;
    top: 10px;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--bg-card);
    border: 3px solid var(--accent);
    box-shadow: 0 0 0 4px rgba(var(--accent-rgb), 0.15);
}

.timeline-role {
    font-size: 0.8rem;
    font-weight: 800;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    display: block;
    margin-bottom: 4px;
}


.skill-groups {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 28px 40px;
}

.skill-group-title {
    font-size: 0.95rem;
    font-weight: 800;
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 14px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.skill-group-title i {
    color: var(--accent);
}

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

.skill-chip {
    padding: 6px 14px;
    border-radius: 999px;
    border: 1px solid var(--border-light);
    background: var(--bg-submenu);
    color: var(--text-secondary);
    font-size: 0.82rem;
    font-weight: 600;
    transition: all 0.25s ease;
    cursor: default;
}

.skill-chip:hover {
    border-color: rgba(var(--accent-rgb), 0.55);
    color: var(--accent);
    transform: translateY(-2px);
}


.cert-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px 24px;
    margin-top: 8px;
}

.cert-item {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 12px;
    padding: 12px 4px;
    border-bottom: 1px dashed var(--border-light);
}

.cert-name {
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.92rem;
}

.cert-name .badge-official {
    font-size: 0.62rem;
    font-weight: 800;
    color: var(--accent);
    border: 1px solid rgba(var(--accent-rgb), 0.4);
    border-radius: 6px;
    padding: 1px 6px;
    margin-left: 6px;
    vertical-align: middle;
    letter-spacing: 0.5px;
}

.cert-issuer {
    color: var(--text-muted);
    font-size: 0.78rem;
    white-space: nowrap;
}


@media (max-width: 768px) {
    .project-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .section-title {
        font-size: 1.8rem;
    }

    .details-box {
        padding: 25px;
    }

    .pf-stat-row {
        grid-template-columns: 1fr;
    }

    .skill-groups,
    .cert-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .project-grid {
        grid-template-columns: 1fr;
    }
}