:root {
  --bg: #0f1419;
  --bg-2: #161d27;
  --surface: #1c2533;
  --line: rgba(231, 236, 243, 0.08);
  --text: #e7ecf3;
  --muted: #9aa7b8;
  --accent: #3d9a8b;
  --accent-2: #c4a35a;
  --danger: #d65a5a;
  --radius: 14px;
  --font-display: "Noto Serif SC", "Songti SC", serif;
  --font-body: "DM Sans", "PingFang SC", "Helvetica Neue", sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  min-height: 100vh;
  color: var(--text);
  font-family: var(--font-body);
  background:
    radial-gradient(1000px 500px at 10% -10%, rgba(61, 154, 139, 0.18), transparent 60%),
    radial-gradient(800px 400px at 90% 0%, rgba(196, 163, 90, 0.12), transparent 55%),
    linear-gradient(180deg, var(--bg), var(--bg-2));
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: #6fc4b5; }
h1, h2, h3, .brand {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: 0.02em;
}

.shell { width: min(1120px, calc(100% - 2rem)); margin: 0 auto; }
.topbar {
  position: sticky; top: 0; z-index: 20;
  backdrop-filter: blur(12px);
  background: rgba(15, 20, 25, 0.78);
  border-bottom: 1px solid var(--line);
}
.topbar-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; padding: 0.9rem 0;
}
.brand { font-size: 1.25rem; color: var(--text); }
.brand span { color: var(--accent-2); }
.nav { display: flex; flex-wrap: wrap; gap: 0.85rem; align-items: center; }
.nav a { color: var(--muted); font-size: 0.95rem; }
.nav a:hover, .nav a.active { color: var(--text); }

.hero {
  padding: 3.5rem 0 2rem;
  animation: rise 0.7s ease both;
}
.hero h1 { font-size: clamp(2rem, 4vw, 3rem); margin: 0 0 0.6rem; }
.hero p { color: var(--muted); max-width: 40rem; line-height: 1.7; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1rem;
}
.card {
  background: rgba(28, 37, 51, 0.9);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.1rem 1.15rem;
  transition: transform .2s ease, border-color .2s ease;
}
.card:hover { transform: translateY(-2px); border-color: rgba(61,154,139,.35); }
.card h3 { margin: 0 0 0.45rem; font-size: 1.1rem; }
.card p { margin: 0; color: var(--muted); font-size: 0.92rem; line-height: 1.55; }
.card-cover {
  width: 100%; height: 140px; object-fit: cover; border-radius: 8px;
  margin-bottom: 0.65rem; display: block; background: rgba(0,0,0,.25);
}
.tag-list { display: flex; flex-wrap: wrap; gap: 0.4rem; margin: 0; }
.tag-link {
  display: inline-flex; align-items: center;
  padding: 0.15rem 0.55rem; border-radius: 6px;
  border: 1px solid var(--line); background: rgba(28,37,51,.7);
  color: var(--accent); text-decoration: none; font-size: 0.85rem;
}
.tag-link:hover { border-color: var(--accent); background: rgba(61,154,139,.15); }
.meta { margin-top: 0.75rem; font-size: 0.8rem; color: var(--accent-2); }

.btn, button.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 0.4rem; border: 0; cursor: pointer;
  background: var(--accent); color: #041512;
  padding: 0.55rem 1rem; border-radius: 999px;
  font-weight: 600; font-size: 0.92rem;
}
.btn.secondary { background: transparent; color: var(--text); border: 1px solid var(--line); }
.btn.danger { background: var(--danger); color: white; }
.btn:hover { filter: brightness(1.08); }

.panel {
  background: rgba(28, 37, 51, 0.92);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin: 1rem 0 2rem;
}
label { display: block; margin: 0.75rem 0 0.35rem; color: var(--muted); font-size: 0.9rem; }
input, select, textarea {
  width: 100%; padding: 0.65rem 0.75rem;
  border-radius: 10px; border: 1px solid var(--line);
  background: #121821; color: var(--text); font: inherit;
}
textarea { min-height: 120px; resize: vertical; }
.form-actions { display: flex; gap: 0.6rem; flex-wrap: wrap; margin-top: 1rem; }
.flash {
  padding: 0.75rem 1rem; border-radius: 10px; margin: 1rem 0;
  background: rgba(61,154,139,.15); border: 1px solid rgba(61,154,139,.35);
}
.errors { color: #ffb4b4; margin: 0.5rem 0; padding-left: 1.1rem; }
.stats { display: flex; gap: 1rem; flex-wrap: wrap; margin: 1.5rem 0; }
.stat {
  flex: 1; min-width: 120px; padding: 1rem;
  border-radius: var(--radius); border: 1px solid var(--line);
  background: rgba(28,37,51,.7);
}
.stat strong { display: block; font-size: 1.6rem; font-family: var(--font-display); }
.stat span { color: var(--muted); font-size: 0.85rem; }

.frame-strip {
  display: flex; gap: 0.65rem; overflow-x: auto; padding-bottom: 0.5rem;
}
.frame-strip img,
.frame-thumb img {
  height: 140px; width: auto; border-radius: 8px; border: 2px solid transparent;
  cursor: zoom-in; object-fit: cover; display: block;
}
.frame-strip img.selected,
.frame-thumb img.selected { border-color: var(--accent); }
.frame-thumb {
  text-align: center; flex: 0 0 auto;
  padding: 0; border: 0; background: transparent; color: inherit;
  font: inherit; cursor: pointer;
}
.frame-thumb .muted { font-size: 0.78rem; margin-top: 0.25rem; }
.frame-thumb.selected img,
.frame-strip img.selected {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(61,154,139,.35);
}
.group-card-head {
  display: flex; align-items: center; gap: 0.75rem; margin-bottom: 0.5rem;
}
.group-card.is-active {
  border-color: rgba(61,154,139,.55);
  box-shadow: inset 0 0 0 1px rgba(61,154,139,.25);
}
.group-list-head {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; margin-bottom: 0.75rem; flex-wrap: wrap;
}
.table-wrap { overflow-x: auto; }
#group-list-table tr.is-active-row td {
  background: rgba(61,154,139,.12);
}
#group-list-table td { vertical-align: top; }

.lightbox {
  position: fixed; inset: 0; z-index: 1000;
  display: none; align-items: center; justify-content: center;
  background: rgba(6, 10, 16, 0.88); padding: 1.5rem; cursor: zoom-out;
}
.lightbox.open,
.lightbox.open[hidden] { display: flex; }
.lightbox-inner {
  position: relative; max-width: min(96vw, 1280px); max-height: 92vh;
  cursor: default;
}
.lightbox-inner img {
  display: block; max-width: 96vw; max-height: 86vh;
  width: auto; height: auto; border-radius: 10px;
  box-shadow: 0 16px 48px rgba(0,0,0,.45);
}
.lightbox-caption {
  margin-top: 0.65rem; text-align: center; color: #c9d4e3; font-size: 0.9rem;
}
.lightbox-close {
  position: absolute; top: -0.4rem; right: -0.4rem;
  width: 2rem; height: 2rem; border: 0; border-radius: 999px;
  background: rgba(28,37,51,.95); color: #fff; cursor: pointer;
  font-size: 1.1rem; line-height: 1;
}

.pager { margin: 0.75rem 0; }
.pager-list {
  display: flex; flex-wrap: wrap; gap: 0.35rem; list-style: none;
  margin: 0; padding: 0; align-items: center;
}
.pager-list a,
.pager-list span {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 2rem; height: 2rem; padding: 0 0.65rem;
  font-size: 0.85rem; line-height: 1;
  border-radius: 8px; border: 1px solid var(--line);
  background: rgba(28,37,51,.7); color: var(--text); text-decoration: none;
}
.pager-list a:hover { border-color: var(--accent); color: var(--accent); }
.pager-list .active span {
  background: rgba(61,154,139,.25); border-color: var(--accent); color: #dff7f2;
}
.pager-list .disabled span { opacity: 0.45; cursor: not-allowed; }

.table { width: 100%; border-collapse: collapse; }
.table th, .table td {
  text-align: left; padding: 0.65rem 0.4rem;
  border-bottom: 1px solid var(--line); font-size: 0.92rem;
}
.muted { color: var(--muted); }
.footer { padding: 2rem 0 3rem; color: var(--muted); font-size: 0.85rem; }

@keyframes rise {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: none; }
}

@media (max-width: 720px) {
  .topbar-inner { flex-direction: column; align-items: flex-start; }
}