:root {
            --primary-color: #8A6932;
            --primary-dark: #6B5126;
            --primary-light: #B8956A;
            --bg-cream: #FBF8F4;
            --border-color: rgba(138, 104, 50, 0.15);
        }
        * { margin: 0; padding: 0; box-sizing: border-box; }
        body {
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, #FBF8F4 0%, #F5EDE3 100%);
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
            padding: 20px;
        }
        .login-container {
            width: 100%;
            max-width: 420px;
            background: white;
            border-radius: 16px;
            box-shadow: 0 4px 24px rgba(138, 104, 50, 0.08);
            overflow: hidden;
        }
        .login-header {
            background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
            padding: 32px 24px 24px;
            text-align: center;
            color: white;
        }
        .login-header h1 {
            font-size: 24px;
            font-weight: 600;
            margin-bottom: 8px;
        }
        .login-header p {
            font-size: 14px;
            opacity: 0.8;
        }
        .login-tabs {
            display: flex;
            border-bottom: 1px solid var(--border-color);
        }
        .login-tab {
            /* flex 由 inline style 控制 */
            padding: 14px;
            text-align: center;
            cursor: pointer;
            font-size: 15px;
            color: #666;
            transition: all 0.2s;
            border-bottom: 2px solid transparent;
        }
        .login-tab.active {
            color: var(--primary-color);
            font-weight: 600;
            border-bottom-color: var(--primary-color);
        }
        .login-form {
            padding: 24px;
        }
        .form-group {
            margin-bottom: 18px;
        }
        .form-group label {
            display: block;
            font-size: 14px;
            color: #333;
            margin-bottom: 8px;
            font-weight: 500;
        }
        .input-group {
            display: flex;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            overflow: hidden;
            transition: border-color 0.2s;
        }
        .input-group:focus-within {
            border-color: var(--primary-color);
        }
        .input-group .prefix {
            padding: 12px 14px;
            background: #FAFAFA;
            color: #333;
            font-size: 15px;
            border-right: 1px solid var(--border-color);
        }
        .input-group input {
            /* flex 由 inline style 控制 */
            padding: 12px 14px;
            border: none;
            outline: none;
            font-size: 15px;
        }
        .input-group input::placeholder {
            color: #BBB;
        }
        .btn-send-code {
            white-space: nowrap;
            padding: 12px 16px;
            background: transparent;
            border: none;
            color: var(--primary-color);
            font-size: 14px;
            cursor: pointer;
        }
        .btn-send-code:disabled {
            color: #999;
            cursor: not-allowed;
        }
        .btn-login {
            background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
            color: white;
            padding: 14px;
            border: none;
            border-radius: 8px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.2s;
        }
        .btn-login:hover {
            transform: translateY(-1px);
            box-shadow: 0 4px 12px rgba(138, 104, 50, 0.3);
        }
        .alert {
            padding: 12px 16px;
            border-radius: 8px;
            margin-bottom: 18px;
            font-size: 14px;
        }
        .alert-danger {
            background: #FFF5F5;
            color: #E53E3E;
            border: 1px solid #FED7D7;
        }
        .alert-success {
            background: #F0FFF4;
            color: #38A169;
            border: 1px solid #C6F6D5;
        }
        .login-footer {
            text-align: center;
            padding: 16px 24px 24px;
            font-size: 14px;
            color: #666;
        }
        .login-footer a {
            color: var(--primary-color);
            text-decoration: none;
        }
        .login-footer a:hover {
            text-decoration: underline;
        }
        /* 微信登录区域 */
        .wechat-login-section {
            margin-top: 24px;
            padding-top: 20px;
            border-top: 1px solid rgba(138, 104, 50, 0.1);
        }
        .divider {
            display: flex;
            align-items: center;
            margin-bottom: 20px;
            color: #7a6650;
            font-size: 13px;
        }
        .divider::before, .divider::after {
            content: "";
            /* flex 由 inline style 控制 */
            border-bottom: 1px solid rgba(138, 104, 50, 0.15);
        }
        .divider::before { margin-right: 12px; }
        .divider::after { margin-left: 12px; }
        .btn-wechat {
            background: #f8f8f8;
            border: 1px solid #e0e0e0;
            color: #333;
            padding: 12px;
            font-weight: 500;
            border-radius: 8px;
            font-size: 15px;
            transition: all 0.2s;
            display: flex;
            align-items: center;
            justify-content: center;
            text-decoration: none;
        }
        .btn-wechat:hover {
            background: #f0f0f0;
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            color: #333;
        }
        /* 切换登录方式 */
        .switch-mode {
            text-align: center;
            margin-top: 16px;
            font-size: 14px;
            color: #666;
        }
        .switch-mode a {
            color: var(--primary-color);
            text-decoration: none;
            cursor: pointer;
        }
        /* 密码/验证码切换 */
        .method-toggle {
            display: flex;
            justify-content: flex-end;
            margin-bottom: 8px;
        }
        .method-toggle a {
            font-size: 13px;
            color: var(--primary-color);
            text-decoration: none;
            cursor: pointer;
        }