/* ==========================================================================
   THRU.AI.KR — 자료실(/intro) : 폴더 · 자료 · 앨범 · 발표 보기
   site.css 의 토큰(--bg, --text, --surface …)을 사용한다.
   ========================================================================== */

.visually-hidden {
    position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px;
    overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

.brand-sub {
    padding: 3px 9px; border-radius: 999px; background: var(--surface-2); border: 1px solid var(--border);
    font-size: 12px; font-weight: 700; color: var(--text-2); white-space: nowrap;
}

.intro-main { padding: 26px 0 72px; }
.intro-flash {
    margin-bottom: 18px; padding: 12px 16px; border-radius: 12px; font-size: 14px;
    background: color-mix(in srgb, var(--success) 14%, transparent); color: var(--success);
    border: 1px solid color-mix(in srgb, var(--success) 30%, transparent);
}
.intro-flash.is-error { background: color-mix(in srgb, var(--danger) 12%, transparent); color: var(--danger); border-color: color-mix(in srgb, var(--danger) 30%, transparent); }

.intro-crumbs { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; font-size: 13.5px; color: var(--text-3); }
.intro-crumbs a { display: inline-flex; align-items: center; gap: 5px; color: var(--text-3); }
.intro-crumbs a:hover { color: var(--text); }
.intro-crumbs strong { color: var(--text); font-weight: 700; }

.intro-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 20px; flex-wrap: wrap; margin: 14px 0 6px; }
.intro-head h1 { font-size: clamp(1.6rem, 3vw, 2.1rem); font-weight: 800; letter-spacing: -.03em; }
.intro-desc { margin-top: 6px; color: var(--text-2); font-size: .97rem; max-width: 640px; }

.intro-section-title {
    display: flex; align-items: center; gap: 8px; margin: 30px 0 14px;
    font-size: 13px; font-weight: 700; letter-spacing: .06em; color: var(--text-3); text-transform: uppercase;
}
.intro-section-title span { padding: 1px 8px; border-radius: 999px; background: var(--surface-2); font-size: 12px; color: var(--text-2); }

/* 폴더 ------------------------------------------------------------------ */
.folder-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 14px; }
.folder-card {
    display: flex; align-items: center; gap: 14px; padding: 14px 16px;
    border: 1px solid var(--border); border-radius: 16px; background: var(--surface);
    transition: transform .2s var(--ease), border-color .2s, background-color .2s;
}
.folder-card:hover { transform: translateY(-2px); border-color: var(--border-strong); background: var(--surface-2); }
.folder-icon {
    display: grid; place-items: center; flex-shrink: 0; width: 46px; height: 46px; border-radius: 14px;
    background: linear-gradient(135deg, rgba(124, 92, 255, .22), rgba(34, 211, 238, .16)); color: var(--brand);
}
.folder-info { min-width: 0; }
.folder-info strong { display: block; font-size: 15px; font-weight: 700; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.folder-info small { font-size: 12.5px; color: var(--text-3); }

/* 자료 카드 -------------------------------------------------------------- */
.asset-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 18px; }
.asset-card {
    border: 1px solid var(--border); border-radius: 18px; background: var(--card-bg); overflow: hidden;
    transition: transform .25s var(--ease), border-color .2s, box-shadow .25s;
}
.asset-card:hover { transform: translateY(-4px); border-color: var(--border-strong); box-shadow: var(--shadow-lg); }
.asset-open { display: block; width: 100%; padding: 0; border: 0; background: none; color: inherit; text-align: left; cursor: pointer; }
.asset-thumb { position: relative; display: block; aspect-ratio: 16 / 9; background: var(--surface-2); overflow: hidden; }
.asset-thumb img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform .4s var(--ease); }
.asset-card:hover .asset-thumb img { transform: scale(1.04); }
.asset-thumb-fallback { position: absolute; inset: 0; display: grid; place-items: center; color: var(--text-3); }
.asset-badge {
    position: absolute; top: 10px; left: 10px; padding: 4px 9px; border-radius: 999px;
    background: rgba(8, 12, 24, .58); border: 1px solid rgba(255, 255, 255, .16); color: #fff;
    font-size: 11.5px; font-weight: 700; backdrop-filter: blur(6px);
}
.asset-action {
    position: absolute; right: 10px; bottom: 10px; display: grid; place-items: center;
    width: 36px; height: 36px; border-radius: 50%; color: #fff;
    background: rgba(8, 12, 24, .5); border: 1px solid rgba(255, 255, 255, .2);
    backdrop-filter: blur(6px); opacity: .9; transition: transform .2s var(--ease), opacity .2s;
}
.asset-card:hover .asset-action { opacity: 1; transform: scale(1.08); }
.asset-body { display: grid; gap: 4px; padding: 14px 16px 16px; }
.asset-title { font-size: 15.5px; font-weight: 700; line-height: 1.4; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.asset-desc { font-size: 13px; color: var(--text-2); display: -webkit-box; -webkit-line-clamp: 1; -webkit-box-orient: vertical; overflow: hidden; }
.asset-meta { font-size: 12px; color: var(--text-3); }

/* 앨범 보기 -------------------------------------------------------------- */
.album { width: min(1240px, 100vw - 20px); max-width: none; max-height: none; padding: 0; border: 0; background: transparent; overflow: visible; }
.album::backdrop { background: rgba(3, 5, 12, .93); }
.album-stage { position: relative; display: grid; place-items: center; }
.album-image {
    max-width: 100%; max-height: calc(100dvh - 150px); border-radius: 12px; object-fit: contain;
    background: #0a0d16; box-shadow: 0 30px 80px -30px rgba(0, 0, 0, .9);
}
.album-close { position: fixed; top: 16px; right: 16px; background: rgba(255, 255, 255, .12); border-color: rgba(255, 255, 255, .2); color: #fff; }
.album-close:hover { background: rgba(255, 255, 255, .22); color: #fff; }
.album-nav {
    position: absolute; top: 50%; transform: translateY(-50%); display: grid; place-items: center;
    width: 52px; height: 52px; border-radius: 50%; border: 1px solid rgba(255, 255, 255, .18);
    background: rgba(10, 14, 24, .55); color: #fff; opacity: .75; transition: opacity .2s, background-color .2s;
}
.album-nav:hover { opacity: 1; background: rgba(10, 14, 24, .8); }
.album-nav.prev { left: -8px; }
.album-nav.next { right: -8px; }
.album-nav[hidden] { display: none; }
.album-bar { display: flex; align-items: center; justify-content: space-between; gap: 16px; width: 100%; margin-top: 14px; color: #e9edf8; }
.album-text strong { display: block; font-size: 15px; font-weight: 700; }
.album-text span { font-size: 13px; color: #9aa4bb; }
.album-tools { display: flex; align-items: center; gap: 10px; }
.album-count { font-size: 13px; color: #9aa4bb; font-variant-numeric: tabular-nums; }
.album-tools .icon-btn { background: rgba(255, 255, 255, .1); border-color: rgba(255, 255, 255, .18); color: #fff; }

/* 입장(비밀번호) --------------------------------------------------------- */
.intro-gate { display: grid; place-items: center; min-height: calc(100dvh - 240px); padding: 36px 0; }
.gate-card {
    width: min(420px, 100%); padding: 36px 32px 28px; text-align: center;
    border: 1px solid var(--border); border-radius: 24px; background: var(--card-bg); box-shadow: var(--shadow-lg);
}
.gate-icon {
    display: grid; place-items: center; width: 58px; height: 58px; margin: 0 auto 18px;
    border-radius: 18px; background: var(--grad-brand); color: #fff; box-shadow: 0 14px 30px -14px rgba(124, 92, 255, .9);
}
.gate-card h1 { font-size: 1.5rem; font-weight: 800; letter-spacing: -.02em; }
.gate-desc { margin-top: 8px; font-size: .94rem; color: var(--text-2); }
.gate-field { display: block; margin: 22px 0 14px; }
.gate-field input {
    width: 100%; height: 50px; padding: 0 16px; text-align: center; letter-spacing: .08em;
    border-radius: 14px; border: 1px solid var(--border); background: var(--input-bg); font-size: 16px;
    transition: border-color .2s, box-shadow .2s;
}
.gate-field input:focus { outline: none; border-color: var(--brand); box-shadow: var(--focus); }
.gate-error {
    display: flex; align-items: center; justify-content: center; gap: 8px; margin-top: 18px; padding: 11px 14px;
    border-radius: 12px; font-size: 13.5px; color: var(--danger);
    background: color-mix(in srgb, var(--danger) 12%, transparent); border: 1px solid color-mix(in srgb, var(--danger) 28%, transparent);
}
.gate-foot { margin-top: 18px; font-size: 12.5px; color: var(--text-3); }

.intro-footer { padding: 22px 0 28px; border-top: 1px solid var(--border); font-size: 13px; color: var(--text-3); }
.intro-footer .container { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; }

/* 발표 보기 -------------------------------------------------------------- */
.present-body {
    display: flex; flex-direction: column; height: 100dvh; margin: 0; overflow: hidden;
    background: #05070e; color: #e9edf8;
}
.present-bar { display: flex; align-items: center; gap: 14px; padding: 10px 16px; border-bottom: 1px solid rgba(255, 255, 255, .08); }
.present-bar .icon-btn { background: rgba(255, 255, 255, .06); border-color: rgba(255, 255, 255, .14); color: #e9edf8; }
.present-bar .icon-btn:hover { background: rgba(255, 255, 255, .14); color: #fff; }
.present-title { display: flex; align-items: baseline; gap: 12px; min-width: 0; }
.present-title strong { font-size: 15px; font-weight: 700; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.present-counter { font-size: 13px; color: #94a0b8; font-variant-numeric: tabular-nums; white-space: nowrap; }
.present-tools { display: flex; gap: 8px; margin-left: auto; }

.present-stage { position: relative; flex: 1; min-height: 0; display: grid; place-items: center; padding: 18px; }
.present-slide { max-width: 100%; max-height: 100%; object-fit: contain; border-radius: 8px; background: #fff; box-shadow: 0 30px 70px -30px rgba(0, 0, 0, .9); }
.present-nav {
    position: absolute; top: 50%; transform: translateY(-50%); display: grid; place-items: center;
    width: 54px; height: 54px; border-radius: 50%; border: 1px solid rgba(255, 255, 255, .16);
    background: rgba(255, 255, 255, .08); color: #fff; opacity: .45; transition: opacity .2s, background-color .2s;
}
.present-stage:hover .present-nav { opacity: .9; }
.present-nav:hover { opacity: 1; background: rgba(255, 255, 255, .18); }
.present-nav.prev { left: 18px; }
.present-nav.next { right: 18px; }
.present-nav[disabled] { opacity: .12; cursor: default; }

.present-thumbs { display: flex; gap: 8px; padding: 10px 14px; overflow-x: auto; background: rgba(0, 0, 0, .35); border-top: 1px solid rgba(255, 255, 255, .08); }
.present-thumb { position: relative; flex: 0 0 auto; width: 124px; padding: 0; border: 2px solid transparent; border-radius: 8px; overflow: hidden; background: #0a0d16; cursor: pointer; }
.present-thumb img { display: block; width: 100%; aspect-ratio: 16 / 9; object-fit: cover; }
.present-thumb span { position: absolute; right: 4px; bottom: 4px; padding: 1px 6px; border-radius: 6px; background: rgba(0, 0, 0, .6); font-size: 11px; color: #fff; }
.present-thumb.is-active { border-color: var(--brand); }

.present-fallback { flex: 1; min-height: 0; }
.present-fallback iframe { width: 100%; height: 100%; border: 0; background: #fff; }
.present-empty { flex: 1; display: grid; place-content: center; justify-items: center; gap: 10px; padding: 24px; text-align: center; color: #c7cfe0; }
.present-empty h2 { font-size: 1.2rem; font-weight: 700; color: #fff; }
.present-empty p { max-width: 520px; font-size: 14px; color: #94a0b8; }
.present-empty-actions { display: flex; gap: 10px; margin-top: 12px; flex-wrap: wrap; justify-content: center; }

.present-body.is-fullscreen .present-bar,
.present-body.is-fullscreen .present-thumbs { display: none; }
.present-body.is-fullscreen .present-stage { padding: 0; }
.present-body.is-fullscreen .present-slide { border-radius: 0; max-height: 100dvh; }

/* 반응형 ----------------------------------------------------------------- */
@media (max-width: 760px) {
    .brand-sub { display: none; }
    .intro-main { padding: 18px 0 56px; }
    .asset-grid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 12px; }
    .asset-body { padding: 10px 12px 12px; }
    .asset-title { font-size: 14px; }
    .folder-grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 10px; }
    .folder-card { padding: 12px; gap: 10px; }
    .folder-icon { width: 38px; height: 38px; border-radius: 12px; }
    .album { width: 100vw; }
    .album-image { max-height: calc(100dvh - 190px); border-radius: 0; }
    .album-nav { width: 44px; height: 44px; }
    .album-nav.prev { left: 4px; }
    .album-nav.next { right: 4px; }
    .album-bar { flex-direction: column; align-items: flex-start; gap: 8px; padding: 0 12px; }
    .present-thumb { width: 92px; }
    .present-nav { width: 44px; height: 44px; opacity: .8; }
    .present-nav.prev { left: 6px; }
    .present-nav.next { right: 6px; }
}