:root {
  --bg: #f5f7fb;
  --surface: #ffffff;
  --border: #e2e8f0;
  --text: #1e293b;
  --muted: #64748b;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --soft: #f1f5f9;
  --radius: 12px;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg); color: var(--text); min-height: 100vh;
  font: 14px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif;
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
.muted { color: var(--muted); }
.spacer { flex: 1; }

.topbar {
  display: flex; align-items: center; gap: 12px; height: 60px; padding: 0 24px;
  background: var(--surface); border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 20;
}
.brand { font-size: 17px; font-weight: 700; color: var(--text); }
.brand:hover { text-decoration: none; }
.tag { font-size: 11px; padding: 2px 8px; border-radius: 20px; background: var(--soft); color: var(--muted); border: 1px solid var(--border); }
.navlink { color: var(--muted); font-size: 13px; }
.navuser { color: var(--muted); font-size: 13px; }

.wrap { max-width: 1080px; margin: 0 auto; padding: 24px 20px 48px; }
.admin-wrap { max-width: 900px; }
.crumbs { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; margin-bottom: 18px; font-size: 13px; color: var(--muted); }
.crumbs .sep { color: #cbd5e1; }
.crumbs .current { color: var(--text); font-weight: 600; }

.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); margin-bottom: 20px; overflow: hidden; box-shadow: 0 1px 2px rgba(15, 23, 42, .03); }
.cardhead { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 14px 18px; border-bottom: 1px solid var(--border); background: #fcfdff; font-size: 13px; }

.filetable { width: 100%; border-collapse: collapse; }
.filetable th { text-align: left; font-size: 12px; font-weight: 600; color: var(--muted); padding: 10px 18px; border-bottom: 1px solid var(--border); background: #fafbfd; }
.filetable td { padding: 11px 18px; border-bottom: 1px solid #f1f5f9; }
.filetable tr:last-child td { border-bottom: none; }
.filetable tbody tr:hover { background: #f8fafc; }
.fname { display: inline-flex; align-items: center; gap: 10px; color: var(--text); font-weight: 500; }
.fname:hover { color: var(--primary); text-decoration: none; }
.slash { color: var(--muted); }
.col-size, .col-time { white-space: nowrap; font-size: 13px; }
.col-act { text-align: right; white-space: nowrap; }
.empty { text-align: center; padding: 40px 0 !important; color: var(--muted); }

.badge { display: inline-block; min-width: 40px; text-align: center; font-size: 10px; letter-spacing: .4px; font-weight: 700; padding: 2px 5px; border-radius: 5px; color: #fff; background: #94a3b8; }
.b-dir { background: #f59e0b; } .b-video { background: #8b5cf6; } .b-audio { background: #ec4899; }
.b-image { background: #10b981; } .b-pdf { background: #ef4444; } .b-html { background: #0ea5e9; }
.b-md { background: #6366f1; } .b-text { background: #64748b; }
.mini { font-size: 12px; border: 1px solid var(--border); border-radius: 6px; padding: 3px 9px; color: var(--muted); background: #fff; cursor: pointer; }
.mini:hover { color: var(--primary); border-color: var(--primary); text-decoration: none; }

.btn { display: inline-block; border: 1px solid var(--border); background: #fff; color: var(--text); border-radius: 8px; padding: 8px 14px; font-size: 13px; cursor: pointer; text-decoration: none; }
.btn:hover { text-decoration: none; border-color: #cbd5e1; background: var(--soft); }
.btn.primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn.primary:hover { background: var(--primary-dark); }
.btn.wide { width: 100%; padding: 10px; }
.btn-row { display: flex; flex-wrap: wrap; gap: 10px; padding: 0 18px 18px; }

.filehead { display: flex; align-items: flex-end; justify-content: space-between; gap: 16px; flex-wrap: wrap; margin-bottom: 16px; }
.filehead h1 { font-size: 20px; margin: 0 0 4px; word-break: break-all; }
.meta { font-size: 13px; }
.actions { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.tab { font-size: 13px; padding: 8px 14px; border-radius: 8px 8px 0 0; background: var(--surface); border: 1px solid var(--border); border-bottom: none; font-weight: 600; }
.preview { padding: 18px; min-height: 220px; }
.preview .media { display: block; width: 100%; max-height: 72vh; background: #000; border-radius: 8px; }
.preview .audio { width: 100%; }
.preview .fit { display: block; max-width: 100%; max-height: 76vh; margin: 0 auto; object-fit: contain; }
.preview .frame { width: 100%; height: 76vh; border: 0; border-radius: 8px; }
.preview .code { background: #f8fafc; border: 1px solid var(--border); border-radius: 8px; padding: 16px; overflow: auto; max-height: 76vh; white-space: pre-wrap; word-break: break-word; font: 12.5px/1.7 Consolas, "Cascadia Mono", Menlo, monospace; margin: 0; }
.trunc { margin: 12px 0 0; font-size: 12px; }
.nopreview { text-align: center; padding: 28px 10px; }
.np-actions { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; margin-top: 18px; }

/* README / Markdown */
.readme-card .md-body { padding: 18px 24px 24px; }
.md-body { font-size: 14.5px; line-height: 1.8; overflow-wrap: break-word; }
.md-body h1, .md-body h2 { border-bottom: 1px solid var(--border); padding-bottom: 6px; margin-top: 22px; }
.md-body h1 { font-size: 22px; } .md-body h2 { font-size: 18px; }
.md-body h3 { font-size: 16px; margin-top: 20px; }
.md-body pre { background: #0f172a; color: #e2e8f0; border-radius: 8px; padding: 14px 16px; overflow: auto; }
.md-body code { font: 12.5px/1.6 Consolas, Menlo, monospace; background: var(--soft); padding: 1px 5px; border-radius: 4px; }
.md-body pre code { background: none; padding: 0; color: inherit; }
.md-body table { border-collapse: collapse; width: 100%; margin: 12px 0; }
.md-body th, .md-body td { border: 1px solid var(--border); padding: 7px 10px; }
.md-body th { background: var(--soft); }
.md-body blockquote { border-left: 3px solid var(--primary); margin: 12px 0; padding: 4px 14px; color: var(--muted); background: #f8fafc; }
.md-body img { max-width: 100%; }
.md-body hr { border: 0; border-top: 1px solid var(--border); }

.foot { text-align: center; color: #94a3b8; font-size: 12px; padding: 0 20px 32px; }

/* 登录 */
.center-body { display: flex; align-items: center; justify-content: center; }
.login { width: min(420px, 92vw); padding: 28px; display: flex; flex-direction: column; gap: 14px; }
.login h1 { margin: 0; font-size: 20px; }
.login p { margin: -8px 0 0; font-size: 13px; }
.login label, .form-grid label, label.full { display: flex; flex-direction: column; gap: 6px; font-size: 13px; color: var(--muted); }
.login .back { text-align: center; font-size: 12px; }
.alert { background: #fef2f2; color: #b91c1c; border: 1px solid #fecaca; padding: 8px 12px; border-radius: 8px; font-size: 13px; }

/* 表单 / 后台 */
input[type=text], input[type=password], input[type=number], select, textarea {
  width: 100%; border: 1px solid var(--border); border-radius: 8px; padding: 8px 10px;
  font: 13px/1.5 inherit; color: var(--text); background: #fff; outline: none;
}
input:focus, select:focus, textarea:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37, 99, 235, .1); }
textarea { resize: vertical; font-family: Consolas, Menlo, monospace; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px 18px; padding: 18px; }
label.full { margin: 0 18px 8px; }
.checks { display: flex; flex-direction: column; gap: 8px; padding: 14px 18px 18px; }
.checks label { display: flex; flex-direction: row; align-items: center; gap: 8px; font-size: 13px; color: var(--text); }
.checks input { width: auto; }
.hint { margin: 0 18px 18px; font-size: 12px; color: var(--muted); }
.hint code { background: var(--soft); padding: 2px 6px; border-radius: 4px; }
.status-box { padding: 14px 18px; font-size: 13px; line-height: 1.9; }
.log { margin: 0; padding: 14px 18px 18px; max-height: 320px; overflow: auto; font: 12px/1.7 Consolas, Menlo, monospace; color: #475569; white-space: pre-wrap; word-break: break-all; }
.toast { position: fixed; right: 24px; top: 74px; z-index: 99; padding: 10px 16px; border-radius: 8px; font-size: 13px; opacity: 0; pointer-events: none; transform: translateY(-8px); transition: .2s; background: #fff; box-shadow: 0 8px 24px rgba(15,23,42,.15); }
.toast.show { opacity: 1; transform: translateY(0); }
.toast.ok { border-left: 4px solid #10b981; }
.toast.err { border-left: 4px solid #ef4444; }

@media (max-width: 720px) {
  .form-grid { grid-template-columns: 1fr; }
  .col-time { display: none; }
  .filetable td, .filetable th { padding: 10px 12px; }
  .topbar { padding: 0 14px; }
}