:root {
  --bg: #24261f;
  --ink: #f3f1e9;
  --muted: #aaad9c;
  --line: #3c3e33;
  --accent: #9ab486;
  --accent-soft: #2e3027;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Pretendard", "Noto Sans KR", -apple-system, sans-serif;
  font-weight: 450;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  font-family: "Pretendard", "Noto Sans KR", -apple-system, sans-serif;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0;
}

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

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

/* Header */
.site-header {
  position: sticky;
  top: 0;
  background: rgba(36, 38, 31, 0.9);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
  z-index: 100;
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
}

.brand-mark {
  height: 34px;
  width: auto;
}

.main-nav {
  display: flex;
  gap: 28px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.main-nav a {
  padding: 4px 0;
  border-bottom: 1px solid transparent;
  color: var(--muted);
  transition: color 0.2s, border-color 0.2s;
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--ink);
  border-color: var(--accent);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 20px;
  cursor: pointer;
  color: var(--ink);
}

/* Hero */
.hero {
  max-width: 1200px;
  margin: 0 auto;
  padding: 64px 24px 24px;
  text-align: center;
}

.hero-logo {
  max-width: 110px;
  margin: 0 auto;
}

.hero .tagline {
  color: var(--muted);
  font-size: 14px;
  font-weight: 600;
  margin-top: 18px;
  letter-spacing: 0.04em;
}

/* Filters */
.filters {
  max-width: 1200px;
  margin: 0 auto;
  padding: 8px 24px 32px;
  display: flex;
  justify-content: center;
  gap: 10px;
}

.filter-btn {
  border: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  padding: 8px 18px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.03em;
  cursor: pointer;
  transition: all 0.2s;
  font-family: "Noto Sans KR", sans-serif;
}

.filter-btn:hover {
  border-color: var(--accent);
  color: var(--ink);
}

.filter-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #14150f;
}

/* Project grid */
.grid {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px 80px;
  columns: 3 320px;
  column-gap: 20px;
}

.card {
  display: block;
  break-inside: avoid;
  margin-bottom: 24px;
  position: relative;
  overflow: hidden;
  border-radius: 2px;
}

.card-img {
  overflow: hidden;
  background: var(--accent-soft);
}

.card-img img {
  width: 100%;
  transition: transform 0.5s ease;
}

.card:hover .card-img img {
  transform: scale(1.04);
}

.card-title {
  padding: 10px 2px 0;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--ink);
}

.card.hidden {
  display: none;
}

/* Project detail */
.project-detail {
  max-width: 1100px;
  margin: 0 auto;
  padding: 48px 24px 80px;
}

.project-head {
  display: flex;
  align-items: baseline;
  gap: 16px;
  flex-wrap: wrap;
  border-bottom: 1px solid var(--line);
  padding-bottom: 20px;
  margin-bottom: 12px;
}

.project-head h1 {
  font-size: 30px;
}

.year {
  color: var(--muted);
  font-size: 14px;
  font-weight: 600;
}

.tag-list {
  margin: 14px 0 30px;
}

.tag {
  display: inline-block;
  color: var(--muted);
  font-size: 12px;
  font-weight: 600;
  margin-right: 10px;
}

.photo-grid {
  columns: 2 380px;
  column-gap: 16px;
}

.lightbox-item {
  break-inside: avoid;
  margin-bottom: 16px;
  cursor: zoom-in;
}

.lightbox-item img {
  width: 100%;
  border-radius: 2px;
}

.prev-next {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  font-size: 14px;
  font-weight: 600;
  color: var(--muted);
  flex-wrap: wrap;
}

.prev-next a:hover {
  color: var(--ink);
}

/* About / Contact */
.about-page, .contact-page {
  max-width: 760px;
  margin: 0 auto;
  padding: 64px 24px 100px;
}

.about-page h1, .contact-page h1 {
  font-size: 32px;
  margin-bottom: 28px;
}

.about-text p {
  margin: 0 0 18px;
  font-size: 15px;
  font-weight: 500;
  color: var(--ink);
}

.contact-info p {
  margin: 0 0 14px;
  font-size: 15px;
  font-weight: 600;
}

.contact-info a:hover {
  color: var(--accent);
  text-decoration: underline;
}

/* Footer */
.site-footer {
  text-align: center;
  padding: 40px 24px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 12px;
  font-weight: 600;
}

.site-footer a {
  display: inline-block;
  margin-bottom: 10px;
  letter-spacing: 0.03em;
}

.site-footer a:hover {
  color: var(--accent);
}

/* Lightbox overlay */
.lb-overlay {
  position: fixed;
  inset: 0;
  background: rgba(18, 19, 15, 0.95);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 40px;
}

.lb-overlay.open {
  display: flex;
}

.lb-overlay img {
  max-width: 100%;
  max-height: 100%;
  border-radius: 2px;
}

.lb-close {
  position: absolute;
  top: 24px;
  right: 32px;
  color: #fff;
  font-size: 28px;
  cursor: pointer;
  background: none;
  border: none;
}

/* Responsive */
@media (max-width: 720px) {
  .main-nav { display: none; }
  .nav-toggle { display: block; }
  .main-nav.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    right: 0;
    background: var(--bg);
    border: 1px solid var(--line);
    padding: 16px 24px;
    gap: 14px;
  }
  .hero-logo { max-width: 80px; }
  .grid { columns: 1 100%; }
  .photo-grid { columns: 1 100%; }
}