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

:root {
    --bg: #090909;
    --bg2: #121212;
    --line: rgba(255,255,255,0.09);
    --text: #efefef;
    --muted: rgba(255,255,255,0.48);
    --gold: #d4b56a;
    --gold-dim: rgba(212,181,106,0.18);
    --radius: 16px;
    --shadow: 0 12px 40px rgba(0,0,0,0.45);
    --ease: cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

html { scroll-behavior: smooth; }

body {
    font-family: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg);
    background-image:
        radial-gradient(ellipse 120% 80% at 50% -30%, rgba(212,181,106,0.07), transparent 55%),
        linear-gradient(180deg, var(--bg) 0%, #0e0e0e 100%);
    color: var(--text);
    line-height: 1.5;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

.hidden { display: none !important; }

/* header */
.header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(9,9,9,0.88);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--line);
}

.header-wrap {
    max-width: 1100px;
    margin: 0 auto;
    padding: 14px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.logo {
    font-size: 0.95rem;
    font-weight: 700;
    letter-spacing: 0.32em;
    color: var(--text);
    text-decoration: none;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.badge {
    font-size: 0.62rem;
    letter-spacing: 0.18em;
    color: var(--gold);
}

.header-tools { display: flex; gap: 4px; }

.tool-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: 11px;
    color: var(--muted);
    border: 1px solid transparent;
    background: transparent;
    cursor: pointer;
    text-decoration: none;
    transition: 0.25s;
}

.tool-btn:hover {
    color: var(--text);
    background: rgba(255,255,255,0.06);
    border-color: var(--line);
}

/* intro */
.intro {
    border-bottom: 1px solid var(--line);
}

.intro-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 32px 20px 24px;
    text-align: center;
}

.intro-label {
    font-size: 0.65rem;
    letter-spacing: 0.35em;
    color: var(--gold);
    margin-bottom: 14px;
}

.intro-title {
    font-size: clamp(1.5rem, 4.5vw, 2.4rem);
    font-weight: 300;
    letter-spacing: -0.01em;
    margin-bottom: 12px;
}

.intro-count {
    font-size: 0.85rem;
    color: var(--muted);
}

.intro-count strong {
    color: var(--gold);
    font-weight: 500;
}

/* calendar bar */
.calendar-bar {
    border-bottom: 1px solid var(--line);
    background: rgba(255,255,255,0.02);
}

.calendar-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 12px 20px;
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}

.calendar-label {
    font-size: 0.72rem;
    color: var(--muted);
    letter-spacing: 0.08em;
    white-space: nowrap;
}

.calendar-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.cal-tab {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: 999px;
    border: 1px solid var(--line);
    background: transparent;
    color: var(--muted);
    font-family: inherit;
    font-size: 0.78rem;
    cursor: pointer;
    transition: 0.25s;
}

.cal-tab:hover {
    border-color: rgba(212,181,106,0.4);
    color: var(--text);
}

.cal-tab.active {
    background: var(--gold-dim);
    border-color: var(--gold);
    color: var(--gold);
}

.cal-count {
    font-size: 0.68rem;
    background: rgba(255,255,255,0.08);
    padding: 1px 7px;
    border-radius: 999px;
}

.cal-tab.active .cal-count {
    background: rgba(212,181,106,0.25);
}

/* main gallery */
.main {
    max-width: 1100px;
    margin: 0 auto;
    padding: 24px 20px 56px;
}

.gallery {
    position: relative;
    width: 100%;
}

.item {
    border: 1px solid var(--line);
    border-radius: var(--radius);
    overflow: hidden;
    position: relative;
    cursor: pointer;
    background: var(--bg2);
    box-shadow: var(--shadow);
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.55s var(--ease), transform 0.55s var(--ease), box-shadow 0.3s;
}

.item.show {
    opacity: 1;
    transform: translateY(0);
}

.item.is-hidden {
    display: none;
}

.item img {
    width: 100%;
    height: auto;
    display: block;
    transition: transform 0.65s var(--ease);
}

.item:hover {
    box-shadow: 0 16px 48px rgba(0,0,0,0.55);
}

.item:hover img {
    transform: scale(1.05);
}

.overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.72) 0%, transparent 42%);
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: 16px;
    opacity: 0;
    transition: opacity 0.3s;
}

.item:hover .overlay { opacity: 1; }

.overlay-num {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--gold);
    letter-spacing: 0.14em;
}

.overlay-date {
    font-size: 0.72rem;
    color: rgba(255,255,255,0.78);
    margin-top: 3px;
}

.item.highlight {
    outline: 2px solid var(--gold);
    outline-offset: -2px;
}

.gallery-empty-filter {
    text-align: center;
    padding: 48px 20px;
    color: var(--muted);
    font-size: 0.9rem;
}

/* empty */
.empty {
    text-align: center;
    padding: 80px 20px;
    color: var(--muted);
}

.btn-upload {
    display: inline-block;
    margin-top: 20px;
    padding: 13px 30px;
    border: 1px solid var(--gold);
    color: var(--gold);
    border-radius: 999px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: 0.25s;
}

.btn-upload:hover {
    background: var(--gold);
    color: var(--bg);
}

.footer {
    text-align: center;
    padding: 28px 20px 36px;
    font-size: 0.68rem;
    letter-spacing: 0.22em;
    color: var(--muted);
    border-top: 1px solid var(--line);
}

/* lightbox */
.lightbox {
    position: fixed;
    inset: 0;
    z-index: 200;
    background: rgba(0,0,0,0.95);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: 0.35s;
}

.lightbox.active {
    opacity: 1;
    visibility: visible;
}

.lb-body {
    text-align: center;
    max-width: 94vw;
    padding: 56px 12px 36px;
}

.lb-body img {
    max-width: 100%;
    max-height: 78vh;
    object-fit: contain;
    border-radius: 10px;
}

.lb-caption {
    margin-top: 16px;
    font-size: 0.82rem;
    color: var(--muted);
}

.lb-counter {
    margin-top: 6px;
    font-size: 0.72rem;
    color: rgba(255,255,255,0.3);
}

.lb-close {
    position: absolute;
    top: 14px;
    right: 16px;
    width: 44px;
    height: 44px;
    border: none;
    background: rgba(255,255,255,0.08);
    color: #fff;
    font-size: 1.5rem;
    border-radius: 50%;
    cursor: pointer;
}

.lb-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 46px;
    height: 46px;
    border: 1px solid var(--line);
    background: rgba(255,255,255,0.06);
    color: #fff;
    font-size: 1.4rem;
    border-radius: 50%;
    cursor: pointer;
}

.lb-prev { left: 10px; }
.lb-next { right: 10px; }

/* tablet */
@media (max-width: 768px) {
    .intro-inner { padding: 44px 16px 32px; }
    /* masonry: column count via JS */
    .item {
    border: 1px solid var(--line); margin-bottom: 12px; border-radius: 12px; }
    .main { padding: 28px 14px 56px; }
    .overlay { opacity: 1; background: linear-gradient(to top, rgba(0,0,0,0.5) 0%, transparent 30%); }
    .calendar-inner { padding: 14px 14px; gap: 10px; }
    .calendar-label { width: 100%; }
}

/* mobile */
@media (max-width: 480px) {
    .logo { font-size: 0.82rem; letter-spacing: 0.22em; }
    .badge { display: none; }
    .header-wrap { padding: 12px 14px; }
    .tool-btn { width: 34px; height: 34px; }
    .intro-title { font-size: 1.45rem; }
    /* masonry: column count via JS */
    .cal-tab { padding: 7px 12px; font-size: 0.72rem; }
    .lb-nav { width: 40px; height: 40px; }
}

@media (max-width: 360px) {
    /* masonry: column count via JS */
}