:root {
            --bg: #f5f4f1;
            --surface: #ffffff;
            --surface-2: #f9f8f6;
            --border: rgba(0,0,0,0.07);
            --border-strong: rgba(0,0,0,0.12);
            --text-1: #1a1917;
            --text-2: #6b6a67;
            --text-3: #a09f9c;
            --accent: #1a1917;
            --accent-fg: #ffffff;
            --green: #2d6a4f;
            --green-bg: #d8f3dc;
            --red: #9b2226;
            --red-bg: #ffe8e8;
            --radius-sm: 8px;
            --radius: 12px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
            --shadow-md: 0 4px 12px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.04);
            --font: 'DM Sans', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
            --mono: 'DM Mono', 'Courier New', monospace;
            --transition: 0.18s ease;
        }
        * { box-sizing: border-box; margin: 0; padding: 0; }
        body {
            font-family: var(--font);
            background: var(--bg);
            color: var(--text-1);
            min-height: 100vh;
            padding: 32px 18px 64px;
            line-height: 1.5;
            -webkit-font-smoothing: antialiased;
        }
        .wrap { max-width: 720px; margin: 0 auto; }
        .site-header {
            display: flex; align-items: center; gap: 14px; margin-bottom: 28px;
        }
        .logo-mark {
            width: 42px; height: 42px;
            background: var(--text-1); border-radius: var(--radius);
            display: flex; align-items: center; justify-content: center;
            color: #fff; font-size: 18px; flex-shrink: 0;
        }
        .site-header h1 { font-size: 20px; font-weight: 500; letter-spacing: -0.3px; margin-bottom: 1px; }
        .site-header p { font-size: 13px; color: var(--text-2); }
        .breadcrumb {
            display: flex; align-items: center; gap: 8px;
            margin-bottom: 20px; font-size: 13px; color: var(--text-2);
        }
        .breadcrumb a { color: var(--text-2); text-decoration: none; transition: color var(--transition); }
        .breadcrumb a:hover { color: var(--text-1); }
        .breadcrumb i { font-size: 10px; }
        .card {
            background: var(--surface); border: 1px solid var(--border);
            border-radius: var(--radius-xl); padding: 24px;
            margin-bottom: 16px; box-shadow: var(--shadow);
        }
        .card-title {
            display: flex; align-items: center; gap: 8px;
            font-size: 15px; font-weight: 500; margin-bottom: 20px;
        }
        .card-title i { font-size: 14px; color: var(--text-2); }
        .field { margin-bottom: 0; }
        .field label {
            display: block; font-size: 13px; font-weight: 500;
            color: var(--text-2); margin-bottom: 6px;
        }
        .field .hint {
            font-size: 12px; color: var(--text-3); margin-top: 8px;
            line-height: 1.7;
        }
        .field .hint code {
            background: var(--surface-2); padding: 1px 5px;
            border-radius: 4px; font-family: var(--mono); font-size: 11px;
        }
        textarea {
            width: 100%; height: 110px; padding: 10px 12px;
            border: 1px solid var(--border-strong); border-radius: var(--radius-sm);
            background: var(--surface); font-family: var(--mono); font-size: 13px;
            color: var(--text-1); transition: border-color var(--transition);
            outline: none; resize: vertical; line-height: 1.6;
        }
        textarea:focus { border-color: var(--text-1); }
        .alert {
            display: none; align-items: flex-start; gap: 10px;
            padding: 12px 16px; border-radius: var(--radius);
            font-size: 13px; line-height: 1.6; margin-bottom: 16px;
        }
        .alert.show { display: flex; }
        .alert-success { background: var(--green-bg); color: var(--green); }
        .alert-error { background: var(--red-bg); color: var(--red); }
        .alert i { margin-top: 2px; flex-shrink: 0; }
        .btn {
            display: inline-flex; align-items: center; justify-content: center;
            gap: 6px; height: 40px; padding: 0 20px;
            border-radius: 10px; font-size: 13px; font-weight: 500;
            transition: transform var(--transition);
            border: none; cursor: pointer; font-family: inherit;
        }
        .btn:hover { transform: translateY(-1px); }
        .btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }
        .btn-primary { background: var(--accent); color: var(--accent-fg); }
        .btn-outline {
            background: transparent; color: var(--text-1);
            border: 1px solid var(--border-strong);
        }
        .btn-row { display: flex; gap: 10px; margin-top: 20px; }
        .status-bar {
            display: flex; align-items: center; gap: 8px;
            padding: 10px 14px; border-radius: var(--radius);
            background: var(--surface-2); border: 1px solid var(--border);
            font-size: 12px; color: var(--text-3); margin-top: 16px;
        }
        .footer {
            margin-top: 16px; border: 1px solid var(--border);
            background: var(--surface); border-radius: var(--radius-xl);
            padding: 20px 24px; color: var(--text-2);
            line-height: 1.75; box-shadow: var(--shadow); font-size: 14px;
        }
        .footer code {
            background: var(--surface-2); padding: 1px 5px;
            border-radius: 4px; font-family: var(--mono); font-size: 12px;
        }