:root {
    --bg: #f4f6f9;
    --card-bg: #ffffff;
    --text: #1f2430;
    --text-muted: #6b7280;
    --border: #e5e7eb;
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --success: #16a34a;
    --success-bg: #ecfdf5;
    --error: #dc2626;
    --error-bg: #fef2f2;
    --warn-bg: #fffbeb;
    --radius: 10px;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: -apple-system, "PingFang SC", "Microsoft YaHei", Segoe UI, Helvetica, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    font-size: 14px;
    line-height: 1.6;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.topbar {
    background: #111827;
    color: #fff;
    padding: 0 24px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.topbar .brand { font-weight: 600; font-size: 16px; }
.topbar .brand span { color: #9ca3af; font-weight: 400; margin-left: 8px; font-size: 13px; }
.topbar nav { display: flex; gap: 20px; align-items: center; }
.topbar nav a { color: #d1d5db; }
.topbar nav a:hover { color: #fff; }
.topbar .user-badge { color: #9ca3af; font-size: 13px; }

.layout { display: flex; min-height: calc(100vh - 56px); }

.sidebar {
    width: 190px;
    background: #1f2937;
    padding: 16px 0;
    flex-shrink: 0;
}
.sidebar a {
    display: block;
    padding: 10px 24px;
    color: #cbd5e1;
    font-size: 14px;
}
.sidebar a:hover { background: #374151; text-decoration: none; color: #fff; }
.sidebar a.active { background: var(--primary); color: #fff; }

.main { flex: 1; padding: 28px 32px; max-width: 1100px; }

.page-title { font-size: 20px; font-weight: 600; margin: 0 0 20px; }

.card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px 22px;
    margin-bottom: 20px;
}

.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 14px; margin-bottom: 22px; }
.stat-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px 18px;
}
.stat-card .label { color: var(--text-muted); font-size: 12px; margin-bottom: 6px; }
.stat-card .value { font-size: 22px; font-weight: 700; }

table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
th, td { padding: 9px 10px; text-align: left; border-bottom: 1px solid var(--border); }
th { color: var(--text-muted); font-weight: 600; font-size: 12.5px; }
tr:hover td { background: #fafbfc; }

.btn {
    display: inline-block;
    padding: 8px 16px;
    border-radius: 7px;
    border: 1px solid var(--border);
    background: #fff;
    color: var(--text);
    cursor: pointer;
    font-size: 13.5px;
    font-family: inherit;
}
.btn:hover { background: #f3f4f6; text-decoration: none; }
.btn-primary { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn-primary:hover { background: var(--primary-dark); }
.btn-danger { background: #fff; color: var(--error); border-color: #fca5a5; }
.btn-danger:hover { background: var(--error-bg); }
.btn-sm { padding: 5px 10px; font-size: 12.5px; }
.btn-block { display: block; width: 100%; text-align: center; }

input[type=text], input[type=password], input[type=number], textarea, select {
    width: 100%;
    padding: 9px 11px;
    border: 1px solid var(--border);
    border-radius: 7px;
    font-size: 14px;
    font-family: inherit;
    background: #fff;
    color: var(--text);
}
input:focus, textarea:focus, select:focus { outline: 2px solid #bfdbfe; border-color: var(--primary); }
textarea { resize: vertical; min-height: 120px; font-family: ui-monospace, monospace; }

.form-group { margin-bottom: 16px; }
.form-group label { display: block; margin-bottom: 6px; font-weight: 500; font-size: 13.5px; }
.form-hint { color: var(--text-muted); font-size: 12px; margin-top: 4px; }
.form-row { display: flex; gap: 14px; }
.form-row .form-group { flex: 1; }

.badge { display: inline-block; padding: 2px 9px; border-radius: 999px; font-size: 12px; font-weight: 500; }
.badge-success { background: var(--success-bg); color: var(--success); }
.badge-error { background: var(--error-bg); color: var(--error); }
.badge-muted { background: #f3f4f6; color: var(--text-muted); }
.badge-warn { background: var(--warn-bg); color: #b45309; }

.flash { padding: 11px 16px; border-radius: 8px; margin-bottom: 16px; font-size: 13.5px; }
.flash-success { background: var(--success-bg); color: var(--success); border: 1px solid #a7f3d0; }
.flash-error { background: var(--error-bg); color: var(--error); border: 1px solid #fecaca; }

.auth-wrap {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #1e293b, #111827);
}
.auth-card {
    width: 380px;
    background: #fff;
    border-radius: 14px;
    padding: 34px 32px;
    box-shadow: 0 20px 50px rgba(0,0,0,0.25);
}
.auth-card h1 { font-size: 20px; margin: 0 0 4px; }
.auth-card .subtitle { color: var(--text-muted); font-size: 13px; margin-bottom: 22px; }
.auth-card .switch { text-align: center; margin-top: 16px; font-size: 13px; color: var(--text-muted); }

.face-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 14px; }
.face-card {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 18px;
    text-align: center;
    background: #fff;
}
.face-card .value { font-size: 24px; font-weight: 700; color: var(--primary); margin-bottom: 4px; }
.face-card .stock { font-size: 12px; color: var(--text-muted); margin-bottom: 14px; }

.pagination { display: flex; gap: 6px; margin-top: 16px; align-items: center; font-size: 13px; }
.pagination a, .pagination span { padding: 6px 11px; border: 1px solid var(--border); border-radius: 6px; color: var(--text); }
.pagination .current { background: var(--primary); color: #fff; border-color: var(--primary); }

.code-display {
    font-family: ui-monospace, monospace;
    font-size: 24px;
    letter-spacing: 2px;
    background: #111827;
    color: #4ade80;
    padding: 20px;
    border-radius: 10px;
    text-align: center;
    margin: 20px 0;
    word-break: break-all;
}

.empty-state { text-align: center; padding: 40px 0; color: var(--text-muted); }
.section-gap { margin-top: 28px; }
.text-muted { color: var(--text-muted); }
.text-right { text-align: right; }
.mono { font-family: ui-monospace, monospace; }
.toolbar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; gap: 12px; flex-wrap: wrap; }
.filter-tabs { display: flex; gap: 8px; }
.filter-tabs a { padding: 6px 13px; border-radius: 7px; border: 1px solid var(--border); color: var(--text-muted); font-size: 13px; }
.filter-tabs a.active { background: var(--primary); color: #fff; border-color: var(--primary); }