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

        body {
            font-family: var(--font-body);
            background: #0f0c29;
            background: linear-gradient(135deg, #0f0c29 0%, #302b63 50%, #24243e 100%);
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            padding: 20px;
            position: relative;
            overflow: hidden;
        }

        .login-header h1,
        .nav-logo {
            font-family: var(--font-heading);
        }

        /* 动态背景光晕 */
        body::before {
            content: '';
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: 
                radial-gradient(circle at 20% 50%, rgba(120, 119, 198, 0.3) 0%, transparent 50%),
                radial-gradient(circle at 80% 80%, rgba(102, 126, 234, 0.3) 0%, transparent 50%),
                radial-gradient(circle at 40% 20%, rgba(118, 75, 162, 0.2) 0%, transparent 50%);
            animation: backgroundPulse 15s ease infinite;
            z-index: 0;
        }

        @keyframes backgroundPulse {
            0%, 100% { 
                opacity: 1;
                transform: scale(1);
            }
            50% { 
                opacity: 0.8;
                transform: scale(1.1);
            }
        }

        /* 浮动几何图形 */
        .bg-decoration {
            position: fixed;
            border-radius: 50%;
            opacity: 0.08;
            pointer-events: none;
            background: linear-gradient(135deg, rgba(255, 255, 255, 0.2), rgba(255, 255, 255, 0.05));
            backdrop-filter: blur(2px);
            z-index: 1;
        }

        .bg-decoration:nth-child(1) {
            width: 300px;
            height: 300px;
            top: -100px;
            left: 10%;
            animation: float1 20s ease-in-out infinite;
        }

        .bg-decoration:nth-child(2) {
            width: 200px;
            height: 200px;
            bottom: 10%;
            right: 15%;
            animation: float2 25s ease-in-out infinite;
        }

        .bg-decoration:nth-child(3) {
            width: 150px;
            height: 150px;
            top: 50%;
            right: 10%;
            animation: float3 18s ease-in-out infinite;
        }

        .bg-decoration:nth-child(4) {
            width: 250px;
            height: 250px;
            background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
            transform: rotate(45deg);
            border-radius: 20%;
            bottom: 20%;
            left: 5%;
            animation: rotate360 30s linear infinite;
        }

        @keyframes float1 {
            0%, 100% {
                transform: translate(0, 0) rotate(0deg);
            }
            33% {
                transform: translate(30px, -30px) rotate(120deg);
            }
            66% {
                transform: translate(-20px, 20px) rotate(240deg);
            }
        }

        @keyframes float2 {
            0%, 100% {
                transform: translate(0, 0) rotate(0deg) scale(1);
            }
            50% {
                transform: translate(-40px, 40px) rotate(180deg) scale(1.1);
            }
        }

        @keyframes float3 {
            0%, 100% {
                transform: translate(0, 0) scale(1);
            }
            33% {
                transform: translate(-25px, -25px) scale(1.15);
            }
            66% {
                transform: translate(25px, 15px) scale(0.95);
            }
        }

        @keyframes rotate360 {
            from { transform: rotate(0deg); }
            to { transform: rotate(360deg); }
        }

        /* 粒子效果 */
        .particles {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            pointer-events: none;
            z-index: 1;
        }

        .particle {
            position: absolute;
            width: 3px;
            height: 3px;
            background: rgba(255, 255, 255, 0.7);
            border-radius: 50%;
            box-shadow: 0 0 8px rgba(255, 255, 255, 0.5);
        }

        @keyframes particleFloat {
            0% {
                transform: translateY(100vh) translateX(0);
                opacity: 0;
            }
            10% {
                opacity: 1;
            }
            90% {
                opacity: 1;
            }
            100% {
                transform: translateY(-100px) translateX(100px);
                opacity: 0;
            }
        }

        .login-container {
            background: rgba(255, 255, 255, 0.95);
            border-radius: 24px;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
            padding: 50px 40px;
            width: 100%;
            max-width: 420px;
            backdrop-filter: blur(20px) saturate(180%);
            border: 1px solid rgba(255, 255, 255, 0.5);
            position: relative;
            overflow: hidden;
            animation: slideInUp 0.6s cubic-bezier(0.4, 0, 0.2, 1);
            z-index: 10;
        }

        @keyframes slideInUp {
            from {
                opacity: 0;
                transform: translateY(40px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        /* 容器顶部光效 */
        .login-container::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 4px;
            background: linear-gradient(90deg, transparent, rgba(255,255,255,0.8), transparent);
            animation: shimmer 3s infinite;
        }

        @keyframes shimmer {
            0% { left: -100%; }
            100% { left: 100%; }
        }

        .login-header {
            text-align: center;
            margin-bottom: 40px;
        }

        .login-header .icon-container {
            width: 80px;
            height: 80px;
            margin: 0 auto 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 20px;
            background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
            animation: pulse 2s ease infinite;
        }

        @keyframes pulse {
            0%, 100% {
                transform: scale(1);
                box-shadow: 0 0 0 0 rgba(102, 126, 234, 0.4);
            }
            50% {
                transform: scale(1.05);
                box-shadow: 0 0 0 15px rgba(102, 126, 234, 0);
            }
        }

        .login-header .icon {
            font-size: 3em;
            filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.1));
        }

        .login-header h1 {
            color: #333;
            font-size: 2em;
            margin-bottom: 10px;
            font-weight: 700;
            background: linear-gradient(135deg, #667eea, #764ba2);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .login-header p {
            color: #666;
            font-size: 0.95em;
            font-weight: 500;
        }

        .form-group {
            margin-bottom: 24px;
        }

        .form-group label {
            display: block;
            margin-bottom: 10px;
            font-weight: 600;
            color: #333;
            font-size: 0.9em;
            letter-spacing: 0.5px;
        }

        .input-wrapper {
            position: relative;
        }

        .input-icon {
            position: absolute;
            left: 18px;
            top: 50%;
            transform: translateY(-50%);
            font-size: 1.3em;
            color: #999;
            pointer-events: none;
            transition: all 0.3s ease;
        }

        .form-control {
            width: 100%;
            padding: 16px 20px 16px 55px;
            border: 2px solid #e9ecef;
            border-radius: 14px;
            font-size: 15px;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            background: white;
            font-family: inherit;
        }

        .form-control:focus {
            outline: none;
            border-color: #667eea;
            box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.1);
            transform: translateY(-2px);
        }

        .form-control:focus + .input-icon {
            color: #667eea;
            transform: translateY(-50%) scale(1.1);
        }

        .btn-login {
            width: 100%;
            padding: 16px;
            background: linear-gradient(135deg, #7C3AED, #A78BFA);
            color: white;
            border: none;
            border-radius: 14px;
            font-size: 16px;
            font-weight: 700;
            cursor: pointer;
            transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            margin-top: 10px;
            position: relative;
            overflow: hidden;
            letter-spacing: 0.5px;
            text-transform: uppercase;
            box-shadow: 0 4px 16px rgba(124, 58, 237, 0.3);
        }

        .btn-login::before {
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
            width: 0;
            height: 0;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.3);
            transform: translate(-50%, -50%);
            transition: width 0.6s, height 0.6s;
        }

        .btn-login:hover::before {
            width: 300px;
            height: 300px;
        }

        .btn-login:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 32px rgba(124, 58, 237, 0.5);
        }

        .btn-login:active {
            transform: translateY(-1px);
        }

        .btn-login:disabled {
            background: linear-gradient(135deg, #ccc, #999);
            cursor: not-allowed;
            transform: none;
        }

        /* 消息提示 */
        .alert {
            padding: 16px 20px;
            border-radius: 12px;
            margin-bottom: 24px;
            font-size: 0.9em;
            animation: slideInDown 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            border-left: 4px solid;
            backdrop-filter: blur(10px);
        }

        @keyframes slideInDown {
            from {
                opacity: 0;
                transform: translateY(-20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .alert-error {
            background: linear-gradient(to right, rgba(248, 215, 218, 0.95), rgba(255, 235, 238, 0.95));
            color: #721c24;
            border-color: #dc3545;
            box-shadow: 0 4px 12px rgba(220, 53, 69, 0.2);
        }

        .alert-success {
            background: linear-gradient(to right, rgba(212, 237, 218, 0.95), rgba(232, 245, 233, 0.95));
            color: #155724;
            border-color: #28a745;
            box-shadow: 0 4px 12px rgba(40, 167, 69, 0.2);
        }

        /* 加载动画 */
        .loading-spinner {
            display: inline-block;
            width: 16px;
            height: 16px;
            border: 2px solid rgba(255, 255, 255, 0.3);
            border-top: 2px solid white;
            border-radius: 50%;
            animation: spin 1s linear infinite;
            margin-right: 10px;
            vertical-align: middle;
        }

        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }

        .footer {
            text-align: center;
            margin-top: 30px;
            padding-top: 20px;
            border-top: 1px solid rgba(0, 0, 0, 0.1);
        }

        .footer p {
            color: #999;
            font-size: 0.8em;
            margin: 5px 0;
            font-weight: 500;
        }

        .footer p:first-child {
            color: #666;
            font-weight: 600;
        }

        /* 额外的视觉增强 */
        .divider {
            height: 1px;
            background: linear-gradient(to right, transparent, rgba(0,0,0,0.1), transparent);
            margin: 30px 0;
        }

        /* 导航栏 */
        nav {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 999;
            background: rgba(15, 23, 42, 0.8);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
            padding: 1rem 0;
        }

        .nav-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 2rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .nav-logo {
            font-size: 1.5rem;
            font-weight: 700;
            display: flex;
            align-items: center;
            gap: 0.5rem;
            text-decoration: none;
            color: white;
        }

        .nav-links {
            display: flex;
            gap: 2rem;
            list-style: none;
        }

        .nav-links a {
            color: rgba(255, 255, 255, 0.75);
            text-decoration: none;
            transition: color 0.3s;
            font-size: 0.95rem;
        }

        .nav-links a:hover {
            color: #667eea;
        }

        body {
            padding-top: 60px;
        }

        /* 响应式设计 */
        @media (max-width: 480px) {
            .login-container {
                padding: 40px 30px;
            }

            .login-header h1 {
                font-size: 1.6em;
            }

            .login-header .icon-container {
                width: 70px;
                height: 70px;
            }

            .login-header .icon {
                font-size: 2.5em;
            }

            .nav-links {
                gap: 1rem;
                font-size: 0.9rem;
            }
        }

        /* 聚焦时的标签动画 */
        .form-group {
            position: relative;
        }

        .form-label-float {
            position: absolute;
            left: 55px;
            top: 50%;
            transform: translateY(-50%);
            color: #999;
            pointer-events: none;
            transition: all 0.3s ease;
            font-size: 15px;
        }

        .form-control:focus ~ .form-label-float,
        .form-control:not(:placeholder-shown) ~ .form-label-float {
            top: -10px;
            left: 15px;
            font-size: 12px;
            color: #667eea;
            background: white;
            padding: 0 5px;
        }