/* DSM Admin — 现代简约黑白卡片风格 */
* { margin: 0; padding: 0; box-sizing: border-box; }
:root {
    --bg: #f5f5f5;
    --card: #ffffff;
    --text: #1a1a1a;
    --text-sec: #666;
    --border: #e0e0e0;
    --black: #0e0e0e;
    --white: #fff;
    --radius: 12px;
    --shadow: 0 1px 3px rgba(0,0,0,0.08);
}
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; background: var(--bg); color: var(--text); font-size: 14px; line-height: 1.6; }
a { color: var(--text); text-decoration: none; }

/* 布局 */
.layout { display: flex; min-height: 100vh; }
.sidebar { width: 220px; background: var(--black); color: var(--white); padding: 20px 0; flex-shrink: 0; }
.sidebar .logo { padding: 0 24px 24px; font-size: 18px; font-weight: 700; letter-spacing: 1px; }
.sidebar a { display: block; padding: 12px 24px; color: rgba(255,255,255,0.7); transition: 0.2s; }
.sidebar a:hover, .sidebar a.active { color: var(--white); background: rgba(255,255,255,0.1); }
.main { flex: 1; padding: 24px 32px; overflow-y: auto; }
.topbar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 24px; }
.topbar h1 { font-size: 20px; font-weight: 600; }
.topbar .user { font-size: 13px; color: var(--text-sec); }

/* 卡片 */
.card { background: var(--card); border-radius: var(--radius); padding: 20px 24px; box-shadow: var(--shadow); margin-bottom: 16px; }
.card-title { font-size: 16px; font-weight: 600; margin-bottom: 16px; }

/* 统计卡片 */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-bottom: 24px; }
.stat-card { background: var(--card); border-radius: var(--radius); padding: 20px 24px; box-shadow: var(--shadow); }
.stat-card .label { font-size: 13px; color: var(--text-sec); margin-bottom: 8px; }
.stat-card .value { font-size: 28px; font-weight: 700; }
.stat-card .value.online { color: var(--black); }

/* 表格 */
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 12px 8px; border-bottom: 1px solid var(--border); font-size: 13px; }
th { font-weight: 600; color: var(--text-sec); }
tr:hover { background: #fafafa; }

/* 表单 */
.form-group { margin-bottom: 16px; }
.form-group label { display: block; margin-bottom: 6px; font-weight: 500; font-size: 13px; }
.form-group input, .form-group textarea, .form-group select {
    width: 100%; padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px;
    font-size: 14px; background: var(--white); transition: 0.2s;
}
.form-group input:focus, .form-group textarea:focus { outline: none; border-color: var(--black); }
.form-group textarea { resize: vertical; min-height: 80px; }

/* 按钮 */
.btn { display: inline-block; padding: 10px 20px; border: none; border-radius: 8px; font-size: 14px; cursor: pointer; transition: 0.2s; font-weight: 500; }
.btn-primary { background: var(--black); color: var(--white); }
.btn-primary:hover { background: #333; }
.btn-outline { background: var(--white); color: var(--text); border: 1px solid var(--border); }
.btn-outline:hover { border-color: var(--black); }
.btn-danger { background: #e53935; color: var(--white); }
.btn-sm { padding: 6px 14px; font-size: 12px; }

/* 标签 */
.tag { display: inline-block; padding: 2px 10px; border-radius: 12px; font-size: 12px; }
.tag-black { background: var(--black); color: var(--white); }
.tag-gray { background: #eee; color: var(--text-sec); }
.tag-red { background: #fce4ec; color: #c62828; }
.tag-green { background: #e8f5e9; color: #2e7d32; }

/* 弹窗 */
.empty { text-align: center; padding: 40px; color: var(--text-sec); }
.login-wrap { max-width: 400px; margin: 80px auto; }
.install-wrap { max-width: 600px; margin: 40px auto; }
.progress { display: flex; justify-content: space-between; margin-bottom: 32px; }
.progress-step { flex: 1; text-align: center; font-size: 13px; color: var(--text-sec); position: relative; }
.progress-step.active { font-weight: 600; color: var(--black); }
.progress-step.done { color: #2e7d32; }
.progress-step::after { content: ''; position: absolute; top: 8px; left: 50%; width: 100%; height: 2px; background: var(--border); z-index: 0; }
.progress-step:last-child::after { display: none; }
.progress-step .dot { display: inline-block; width: 16px; height: 16px; border-radius: 50%; background: var(--border); position: relative; z-index: 1; margin-bottom: 4px; }
.progress-step.active .dot, .progress-step.done .dot { background: var(--black); }
.alert { padding: 12px 16px; border-radius: 8px; margin-bottom: 16px; font-size: 13px; }
.alert-error { background: #fce4ec; color: #c62828; }
.alert-success { background: #e8f5e9; color: #2e7d32; }