/* ============================================
   style.css — Sangeun Lee
   ============================================ */

:root {
    --bg: #ffffff;
    --text: #000000;
    --text-secondary: #555555;
    --border: #e0e0e0;
    --hover-bg: #f2f2f2;
    --overlay: rgba(0, 0, 44, 0.8);
    --nav-height: 70px;
    --max-width: 1500px;
    --con-width-pc: 92%;
    --con-width-mo: 90%;
}

[data-theme="dark"] {
    --bg: #111111;
    --text: #ffffff;
    --text-secondary: #aaaaaa;
    --border: #333333;
    --hover-bg: #222222;
    --overlay: rgba(255, 212, 59, 0.9);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Pretendard', 'Segoe UI', sans-serif;
    background: var(--bg);
    color: var(--text);
    transition: background 0.3s, color 0.3s;
    line-height: 1.6;
    overflow-x: hidden;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* ── Nav ── */
.nav-wrapper {
    position: fixed;
    top: 0; left: 0; right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
    height: var(--nav-height);
    display: flex;
    align-items: center;
    padding: 0 4%;
}

@media (min-width: 1400px) {
    .nav-wrapper { padding: 0 calc(4% + (100vw - 1400px) / 2 * 0.3); }
}

.nav-inner {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
}

.logo {
    font-size: 1.1rem;
    font-weight: 800;
    letter-spacing: 1px;
    line-height: 1.2;
    text-decoration: none;
    color: var(--text);
    min-width: 100px;
    text-align: right;
    z-index: 1001;
}

.nav-links {
    display: flex;
    gap: 8px;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
}

.nav-links a {
    color: var(--text-secondary);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.3px;
    text-decoration: none;
    transition: all 0.3s;
    font-weight: 500;
    width: 85px;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    white-space: nowrap;
}

@media (min-width: 1200px) {
    .nav-links { gap: 20px; }
    .nav-links a { width: 90px; }
}

.nav-links a:hover,
.nav-links a.active { color: var(--text); font-weight: 700; }

@media (max-width: 850px) {
    .nav-links { gap: 8px; }
    .nav-links a {
        width: 50px;
        height: 65px;
        font-size: 0.7rem;
        transform: rotate(-50deg);
        padding: 0;
    }
}

.nav-controls {
    display: flex;
    gap: 10px;
    min-width: 100px;
    justify-content: flex-end;
    z-index: 1001;
}

.ctrl-btn {
    background: none;
    border: 1px solid var(--border);
    padding: 4px 12px;
    cursor: pointer;
    color: var(--text);
    font-size: 0.8rem;
    border-radius: 20px;
    transition: 0.2s;
}

.ctrl-btn:hover { background: var(--text); color: var(--bg); border-color: var(--text); }

/* Mobile hamburger */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    position: absolute;
    left: 50%; top: 50%;
    transform: translate(-50%, -50%);
    z-index: 1001;
    padding: 10px;
}

.menu-toggle span {
    display: block;
    width: 24px; height: 2px;
    background: var(--text);
    margin: 5px 0;
    transition: 0.3s;
}

.menu-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.menu-toggle.active span:nth-child(2) { opacity: 0; }
.menu-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

.mobile-menu {
    position: fixed;
    inset: 0;
    background: var(--bg);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s;
}

.mobile-menu.open { opacity: 1; pointer-events: all; }

.mobile-menu a {
    font-size: 1.8rem;
    margin: 15px 0;
    color: var(--text);
    text-decoration: none;
    font-weight: 300;
    padding: 5px 20px;
    transition: 0.3s;
}

.mobile-menu a:hover { background: var(--text); color: var(--bg); }

/* ── Main ── */
main {
    padding-top: var(--nav-height);
    flex: 1;
    padding-bottom: 60px;
}

.fade-in {
    animation: fadeIn 0.5s ease forwards;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(16px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ── Shared components ── */
.page-title {
    font-size: 2rem;
    font-weight: 300;
    margin: 60px auto 40px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border);
    max-width: var(--max-width);
    width: var(--con-width-pc);
}

.back-btn {
    display: inline-block;
    margin-bottom: 40px;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s;
}
.back-btn:hover { color: var(--text); }

/* ── Footer ── */
footer {
    border-top: 1px solid var(--border);
    padding: 40px 0;
    margin-top: auto;
}

.footer-inner {
    width: var(--con-width-pc);
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 4%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
}

@media (min-width: 1400px) {
    .footer-inner { padding: 0 calc(4% + (100vw - 1400px) / 2 * 0.3); }
}

.footer-copy { color: #999; }

.footer-social { display: flex; gap: 20px; }
.footer-social a { color: var(--text); text-decoration: none; font-size: 1.2rem; transition: opacity 0.2s; }
.footer-social a:hover { opacity: 0.6; }

/* ── index (Current) ── */
.current-wrap {
    min-height: calc(100vh - var(--nav-height));
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 40px 20px;
}

.current-wrap h1 {
    font-size: clamp(2.0rem, 3vw, 4.5rem);
    font-weight: 300;
    margin-bottom: 20px;
    line-height: 1.2;
}

.current-wrap .subtitle {
    font-size: clamp(1rem, 2vw, 1.3rem);
    color: var(--text-secondary);
    margin-bottom: 40px;
}

.featured-img {
    width: 100%;
    max-width: 500px;
    margin-bottom: 40px;
    border-radius: 4px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
}

.hero-links { display: flex; gap: 20px; }

.hero-link {
    padding: 12px 30px;
    border: 1px solid var(--text);
    color: var(--text);
    text-decoration: none;
    font-size: 0.9rem;
    transition: 0.3s;
}
.hero-link:hover { background: var(--text); color: var(--bg); }

/* ── Works ── */
.works-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(400px, 1fr));
    max-width: 1800px;
    margin: 0 auto;
    padding: 0 20px;
}

.work-card {
    display: block;
    text-decoration: none;
    color: inherit;
    overflow: hidden;
}

.work-thumb {
    width: 100%;
    aspect-ratio: 4/3;
    overflow: hidden;
    position: relative;
}

.work-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s ease;
}

.work-card:hover .work-thumb img { transform: scale(1.08); }

.work-overlay {
    position: absolute;
    bottom: 0; left: 0; right: 0;
    background: linear-gradient(to top, var(--overlay), transparent);
    padding: 40px 20px 20px;
    opacity: 0;
    transition: 0.3s;
}

.work-card:hover .work-overlay { opacity: 1; }
.work-overlay h3 { color: #fff; font-weight: 500; font-size: 1.2rem; }
.work-overlay p  { color: rgba(255,255,255,0.8); font-size: 0.9rem; }

/* ── Projects ── */
.proj-list {
    max-width: 1200px;
    margin: 0 auto;
    width: var(--con-width-pc);
}

.proj-item {
    display: flex;
    gap: 40px;
    padding: 40px 20px;
    border-bottom: 1px solid var(--border);
    text-decoration: none;
    color: inherit;
    transition: 0.3s;
}

.proj-item:hover { background: var(--hover-bg); padding-left: 30px; }

.proj-thumb {
    flex: 0 0 260px;
    height: 220px;
    overflow: hidden;
    position: relative;
    background: #111;
    display: flex;
    align-items: center;
    justify-content: center;
}
.proj-thumb .poster-bg {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    filter: blur(14px) brightness(0.35);
    transform: scale(1.15);
}
.proj-thumb img {
    position: relative;
    z-index: 1;
    width: auto;
    height: 100%;
    max-width: 100%;
    object-fit: contain;
}

.proj-info { display: flex; flex-direction: column; justify-content: center; }
.proj-role  { font-size: 0.8rem; color: var(--text-secondary); text-transform: uppercase; margin-bottom: 5px; }
.proj-title { font-size: 1.5rem; font-weight: 500; margin-bottom: 15px; }
.proj-desc  { color: var(--text-secondary); line-height: 1.6; }

/* Sub-page inside projects */
.case-study {
    max-width: 1000px;
    margin: 60px auto;
    width: var(--con-width-pc);
}

.case-study h1 { font-size: 2.8rem; font-weight: 400; margin-bottom: 40px; line-height: 1.2; }

.case-meta {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    padding: 20px 0;
    margin-bottom: 60px;
}

.case-meta h4 { font-size: 0.75rem; color: var(--text-secondary); margin-bottom: 5px; }

.case-img { width: 100%; margin-bottom: 60px; border-radius: 4px; }

.case-body { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; }
.case-body h3 { margin-bottom: 20px; font-weight: 600; }
.case-body p  { color: var(--text-secondary); line-height: 1.6; margin-bottom: 20px; }

/* Leaflets grid */
.leaflets-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 30px;
    max-width: 1200px;
    margin: 0 auto;
    width: var(--con-width-pc);
}

.leaflet-card {
    display: block;
    text-decoration: none;
    color: inherit;
    border: 1px solid var(--border);
    overflow: hidden;
    transition: box-shadow 0.3s;
}

.leaflet-card:hover { box-shadow: 0 8px 24px rgba(0,0,0,0.08); }

.leaflet-thumb {
    width: 100%;
    aspect-ratio: 3/4;
    background: var(--hover-bg);
    overflow: hidden;
}

.leaflet-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s; }
.leaflet-card:hover .leaflet-thumb img { transform: scale(1.04); }

.leaflet-info {
    padding: 14px 18px;
    border-top: 1px solid var(--border);
}

.leaflet-date { font-size: 0.75rem; color: var(--text-secondary); font-family: monospace; margin-bottom: 4px; }
.leaflet-name { font-size: 1rem; font-weight: 500; }

/* Breadcrumb */
.breadcrumb {
    font-size: 0.85rem;
    color: var(--text-secondary);
    max-width: 1200px;
    margin: 0 auto 30px;
    width: var(--con-width-pc);
}

.breadcrumb a { color: var(--text-secondary); text-decoration: none; }
.breadcrumb a:hover { color: var(--text); }
.breadcrumb span { margin: 0 8px; }

/* ── Research / Archive list ── */
.list-wrap {
    max-width: 1200px;
    margin: 0 auto;
    width: var(--con-width-pc);
}

.filter-tabs { display: flex; gap: 10px; margin-bottom: 40px; flex-wrap: wrap; }

.tab-btn {
    padding: 8px 20px;
    background: none;
    border: 1px solid var(--border);
    border-radius: 20px;
    cursor: pointer;
    color: var(--text-secondary);
    font-size: 0.9rem;
    transition: 0.2s;
}

.tab-btn.active,
.tab-btn:hover { background: var(--text); color: var(--bg); border-color: var(--text); }

.list-item {
    display: grid;
    grid-template-columns: 120px 1fr auto;
    padding: 25px 20px;
    border-bottom: 1px solid var(--border);
    align-items: center;
    text-decoration: none;
    color: inherit;
    transition: 0.3s;
}

.list-item:hover { background: var(--hover-bg); padding-left: 35px; }
.list-item.hidden { display: none; }

.item-date { font-family: monospace; color: var(--text-secondary); }
.item-content h3 { font-size: 1.2rem; font-weight: 500; margin-bottom: 5px; }
.item-content p  { font-size: 0.95rem; color: var(--text-secondary); }
.item-arrow { font-size: 1.2rem; opacity: 0; transform: translateX(-10px); transition: 0.3s; }
.list-item:hover .item-arrow { opacity: 1; transform: translateX(0); }

/* ── About ── */
.about-wrap {
    max-width: 600px;
    margin: 60px auto;
    width: var(--con-width-pc);
}

.about-wrap p {
    font-size: 1.0rem;
    line-height: 1.9;
    margin-bottom: 20px;
}

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

/* ── Responsive ── */
@media (max-width: 1024px) {
    .works-grid { grid-template-columns: repeat(2, 1fr); }
    .proj-item  { flex-direction: column; gap: 20px; padding: 30px 0; }
    .proj-item:hover { padding-left: 10px; }
    .proj-thumb { flex: 1 1 auto; width: 100%; height: 260px; } 
}

@media (max-width: 768px) {
    .nav-wrapper { padding: 0 5%; }
    .nav-links   { display: none; }
    .menu-toggle { display: block; }

    .works-grid  { grid-template-columns: 1fr; }
    .case-meta   { grid-template-columns: 1fr 1fr; gap: 20px; }
    .case-body   { grid-template-columns: 1fr; gap: 40px; }

    .list-item { grid-template-columns: 1fr; gap: 8px; }
    .list-item:hover { padding-left: 20px; }

    .footer-inner { flex-direction: column; gap: 15px; text-align: center; }
    .footer-social { gap: 30px; }
}