:root {
    --bg: #0f1117;
    --sidebar: #161b22;
    --card: #1c2128;
    --border: #30363d;
    --text: #e6edf3;
    --text-muted: #8b949e;
    --primary: #58a6ff;
    --primary-hover: #79b8ff;
    --success: #3fb950;
    --danger: #f85149;
    --radius: 8px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

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

/* Login */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #0f1117 0%, #1a1f2e 100%);
}

.login-box {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 40px;
    width: 100%;
    max-width: 400px;
}

.login-box h1 { font-size: 24px; margin-bottom: 4px; }
.login-box .subtitle { color: var(--text-muted); margin-bottom: 24px; }
.login-box .hint { color: var(--text-muted); font-size: 13px; margin-top: 16px; text-align: center; }

/* Layout */
.layout { display: flex; min-height: 100vh; }

.sidebar {
    width: 220px;
    background: var(--sidebar);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    padding: 20px 0;
}

.logo {
    font-size: 18px;
    font-weight: 600;
    padding: 0 20px 20px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 12px;
}

.sidebar nav { flex: 1; }
.sidebar nav a {
    display: block;
    padding: 10px 20px;
    color: var(--text-muted);
    transition: all 0.2s;
}
.sidebar nav a:hover, .sidebar nav a.active {
    color: var(--text);
    background: rgba(88, 166, 255, 0.1);
    border-right: 2px solid var(--primary);
}

.sidebar-footer {
    padding: 16px 20px;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 14px;
    color: var(--text-muted);
}

.content { flex: 1; padding: 32px; overflow-y: auto; }

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}
.page-header h2 { font-size: 24px; }
.page-header p { color: var(--text-muted); font-size: 14px; }

/* Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
}

.stat-value { font-size: 32px; font-weight: 700; color: var(--primary); }
.stat-label { color: var(--text-muted); font-size: 14px; margin-top: 4px; }

/* Card & Table */
.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
}

.card-header h3 { font-size: 16px; }

.table { width: 100%; border-collapse: collapse; }
.table th, .table td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}
.table th { color: var(--text-muted); font-weight: 500; font-size: 13px; }
.table tbody tr:hover { background: rgba(255,255,255,0.02); }
.actions { display: flex; gap: 8px; }

/* Badges */
.badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 12px;
}
.badge-primary { background: rgba(88,166,255,0.15); color: var(--primary); }
.badge-default { background: rgba(139,148,158,0.15); color: var(--text-muted); }
.badge-success { background: rgba(63,185,80,0.15); color: var(--success); }
.badge-danger { background: rgba(248,81,73,0.15); color: var(--danger); }

/* Forms */
.form-group { margin-bottom: 16px; }
.form-group.hidden { display: none; }
.form-group label { display: block; margin-bottom: 6px; font-size: 14px; color: var(--text-muted); }
.field-hint { display: block; font-size: 12px; color: var(--text-muted); margin-top: 4px; }
.form-group input[readonly] { opacity: 0.85; cursor: default; }
.form-group input, .form-group select {
    width: 100%;
    padding: 10px 12px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    font-size: 14px;
}
.form-group input:focus, .form-group select:focus {
    outline: none;
    border-color: var(--primary);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    padding: 8px 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--card);
    color: var(--text);
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s;
}
.btn:hover { border-color: var(--text-muted); }
.btn-primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); border-color: var(--primary-hover); }
.btn-danger { color: var(--danger); border-color: var(--danger); }
.btn-danger:hover { background: rgba(248,81,73,0.1); }
.btn-sm { padding: 4px 10px; font-size: 13px; }
.btn-block { width: 100%; justify-content: center; }

/* Alert */
.alert { padding: 12px 16px; border-radius: var(--radius); margin-bottom: 16px; font-size: 14px; }
.alert-error { background: rgba(248,81,73,0.1); border: 1px solid var(--danger); color: var(--danger); }

/* Modal */
.modal {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.6);
    z-index: 100;
    align-items: center;
    justify-content: center;
}
.modal.show { display: flex; }

.modal-content {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 12px;
    width: 100%;
    max-width: 480px;
    padding: 24px;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 24px;
    cursor: pointer;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
    margin-top: 20px;
}