:root {
  --bg: #0f1115;
  --card: #1a1d24;
  --border: #2a2e38;
  --text: #e8eaf0;
  --muted: #8b91a0;
  --accent: #4f8cff;
  --danger: #ff5f56;
  --ok: #34d399;
}

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

[hidden] { display: none !important; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  min-height: 100vh;
}

a { color: var(--accent); text-decoration: none; }

/* ---------- 顶栏 ---------- */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: rgba(15, 17, 21, .9);
  backdrop-filter: blur(8px);
  z-index: 10;
}
.logo { font-size: 1.2rem; font-weight: 700; color: var(--text); }
.header-nav { display: flex; gap: 1.25rem; font-size: .9rem; }
.header-nav a { color: var(--muted); }
.header-nav a:hover { color: var(--text); }

/* ---------- 主页瀑布流 ---------- */
.wall {
  columns: 4 260px;
  column-gap: 14px;
  padding: 1.25rem 1.5rem;
}
.wall-item {
  break-inside: avoid;
  margin-bottom: 14px;
  border-radius: 12px;
  overflow: hidden;
  background: var(--card);
  cursor: zoom-in;
  border: 1px solid var(--border);
}
.wall-item img {
  display: block;
  width: 100%;
  height: auto;
  transition: transform .25s ease;
}
.wall-item:hover img { transform: scale(1.03); }

/* ---------- 灯箱 ---------- */
.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, .88);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
}
.lightbox img { max-width: 92vw; max-height: 92vh; border-radius: 8px; }
.lightbox-close {
  position: absolute;
  top: 1rem;
  right: 1.25rem;
  width: 40px; height: 40px;
  border: none;
  border-radius: 50%;
  background: rgba(255, 255, 255, .12);
  color: #fff;
  font-size: 1.4rem;
  cursor: pointer;
}

/* ---------- 空状态 ---------- */
.empty {
  text-align: center;
  color: var(--muted);
  padding: 4rem 1rem;
  font-size: .95rem;
}

/* ---------- 登录 ---------- */
.center-page {
  display: flex;
  align-items: center;
  justify-content: center;
}
.login-card {
  width: min(360px, 90vw);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2.25rem 2rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  text-align: center;
}
.login-card h1 { font-size: 1.3rem; }
.login-card input {
  padding: .75rem 1rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 1rem;
}
.login-card input:focus { outline: none; border-color: var(--accent); }
.login-card button {
  padding: .75rem;
  border: none;
  border-radius: 10px;
  background: var(--accent);
  color: #fff;
  font-size: 1rem;
  cursor: pointer;
}
.login-card button:hover { filter: brightness(1.1); }
.back-link { font-size: .85rem; color: var(--muted); }
.error { color: var(--danger); font-size: .9rem; }

/* ---------- 管理页 ---------- */
.admin-main { max-width: 1100px; margin: 0 auto; padding: 1.5rem; }

.upload-zone {
  border: 2px dashed var(--border);
  border-radius: 16px;
  padding: 2.5rem 1.5rem;
  text-align: center;
  cursor: pointer;
  transition: border-color .2s, background .2s;
}
.upload-zone:hover, .upload-zone.dragover {
  border-color: var(--accent);
  background: rgba(79, 140, 255, .06);
}
.upload-title { font-size: 1.05rem; margin-bottom: .4rem; }
.upload-hint { color: var(--muted); font-size: .85rem; }

.progress-wrap {
  margin-top: 1.25rem;
  display: flex;
  align-items: center;
  gap: .75rem;
  justify-content: center;
  color: var(--muted);
  font-size: .85rem;
}
.progress-bar {
  width: 220px;
  height: 6px;
  border-radius: 3px;
  background: var(--border);
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  width: 0;
  background: var(--accent);
  transition: width .15s;
}

.section-title {
  margin: 2rem 0 1rem;
  font-size: 1.05rem;
  color: var(--muted);
  font-weight: 500;
}
.section-title span { color: var(--text); }

.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 14px;
}
.gallery-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}
.gallery-item .thumb-box {
  aspect-ratio: 1;
  overflow: hidden;
  background: var(--bg);
}
.gallery-item img { width: 100%; height: 100%; object-fit: cover; display: block; }
.gallery-item .meta {
  padding: .6rem .75rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: .78rem;
  color: var(--muted);
}
.delete-btn {
  border: none;
  background: none;
  color: var(--danger);
  cursor: pointer;
  font-size: .8rem;
  padding: .2rem .4rem;
  border-radius: 6px;
}
.delete-btn:hover { background: rgba(255, 95, 86, .12); }
.meta-actions { display: flex; gap: .25rem; }
.link-btn {
  border: none;
  background: none;
  color: var(--accent);
  cursor: pointer;
  font-size: .8rem;
  padding: .2rem .4rem;
  border-radius: 6px;
}
.link-btn:hover { background: rgba(79, 140, 255, .12); }

/* ---------- 提示条 ---------- */
.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text);
  padding: .7rem 1.4rem;
  border-radius: 10px;
  font-size: .9rem;
  z-index: 200;
  box-shadow: 0 8px 24px rgba(0, 0, 0, .4);
}
.toast.ok { border-color: var(--ok); }
.toast.err { border-color: var(--danger); }