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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
            background: #0f172a;
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .login-container {
            display: flex;
            width: 900px;
            min-height: 520px;
            border-radius: 16px;
            overflow: hidden;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
        }

        /* ========== 左侧品牌区域 ========== */
        .brand-panel {
            flex: 1;
            background: linear-gradient(160deg, #0f172a 0%, #1e293b 100%);
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            padding: 48px 40px;
            position: relative;
            overflow: hidden;
        }

        /* 背景微妙的网格纹理 */
        .brand-panel::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image:
                linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
                linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
            background-size: 40px 40px;
            pointer-events: none;
        }

        .brand-content {
            position: relative;
            z-index: 1;
            display: flex;
            flex-direction: column;
            align-items: center;
            text-align: center;
        }

        /* SVG Logo */
        .brand-logo {
            width: 72px;
            height: 72px;
            margin-bottom: 20px;
            opacity: 0.9;
        }

        /* 副标题英文 - logo下方 */
        .brand-subtitle {
            font-size: 13px;
            font-weight: 400;
            color: #94a3b8;
            letter-spacing: 2.5px;
            text-transform: uppercase;
            margin-bottom: 6px;
        }

        /* 分割线 */
        .brand-divider {
            width: 48px;
            height: 1px;
            background: linear-gradient(90deg, transparent, #475569, transparent);
            margin-bottom: 22px;
            border: none;
        }

        /* 主标题 - 大字间距 */
        .brand-title {
            font-size: 26px;
            font-weight: 700;
            color: #e2e8f0;
            letter-spacing: 10px;
            line-height: 1.4;
            text-indent: 10px; /* 补偿最后一个字的间距 */
        }

        /* ========== 右侧登录表单 ========== */
        .login-panel {
            flex: 1;
            background: #ffffff;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            padding: 48px 40px;
        }

        .login-panel h2 {
            font-size: 22px;
            font-weight: 600;
            color: #1e293b;
            margin-bottom: 6px;
            align-self: flex-start;
        }

        .login-panel .login-hint {
            font-size: 13px;
            color: #94a3b8;
            margin-bottom: 32px;
            align-self: flex-start;
        }

        .form-group {
            width: 100%;
            margin-bottom: 18px;
        }

        .form-group label {
            display: block;
            font-size: 13px;
            font-weight: 500;
            color: #475569;
            margin-bottom: 6px;
        }

        .form-group input {
            width: 100%;
            height: 44px;
            padding: 0 14px;
            border: 1px solid #cbd5e1;
            border-radius: 8px;
            font-size: 14px;
            color: #1e293b;
            background: #f8fafc;
            transition: border-color 0.2s, box-shadow 0.2s;
            outline: none;
        }

        .form-group input:focus {
            border-color: #0f172a;
            box-shadow: 0 0 0 3px rgba(15, 23, 42, 0.1);
            background: #ffffff;
        }

        .form-group input::placeholder {
            color: #94a3b8;
        }

        .btn-login {
            width: 100%;
            height: 44px;
            margin-top: 8px;
            background: #0f172a;
            color: #ffffff;
            border: none;
            border-radius: 8px;
            font-size: 15px;
            font-weight: 600;
            letter-spacing: 2px;
            cursor: pointer;
            transition: background 0.2s;
        }

        .btn-login:hover {
            background: #1e293b;
        }

        .error-msg {
            width: 100%;
            color: #dc2626;
            font-size: 13px;
            margin-bottom: 12px;
            padding: 10px 14px;
            background: #fef2f2;
            border-radius: 6px;
            border: 1px solid #fecaca;
            display: none;
        }

        .error-msg.show {
            display: block;
        }

        /* 响应式 */
        @media (max-width: 768px) {
            .login-container {
                flex-direction: column;
                width: 90%;
                min-height: auto;
            }
            .brand-panel {
                padding: 36px 24px;
            }
            .brand-logo {
                width: 56px;
                height: 56px;
            }
            .brand-title {
                font-size: 22px;
                letter-spacing: 8px;
            }
            .login-panel {
                padding: 36px 24px;
            }
        }