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

body {
    font-family: 'Microsoft YaHei', 'PingFang SC', sans-serif;
    background: linear-gradient(135deg, #0c1929 0%, #1a3a52 50%, #0c1929 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(circle at 20% 80%, rgba(0, 212, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(0, 100, 255, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.login-container {
    position: relative;
    z-index: 1;
}

.login-box {
    width: 420px;
    background: rgba(12, 25, 41, 0.9);
    border: 1px solid rgba(0, 212, 255, 0.3);
    border-radius: 16px;
    padding: 40px;
    box-shadow: 
        0 20px 60px rgba(0, 0, 0, 0.5),
        0 0 40px rgba(0, 212, 255, 0.1),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
}

.login-box::before {
    content: '';
    position: absolute;
    top: -1px;
    left: -1px;
    right: -1px;
    bottom: -1px;
    border-radius: 16px;
    background: linear-gradient(135deg, #00d4ff 0%, #0066ff 50%, #00d4ff 100%);
    z-index: -1;
    opacity: 0.5;
    animation: borderGlow 3s ease-in-out infinite;
}

@keyframes borderGlow {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 0.6; }
}

.login-header {
    text-align: center;
    margin-bottom: 35px;
}

.login-header .logo {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.login-header h1 {
    font-size: 28px;
    color: #00d4ff;
    margin-bottom: 8px;
    font-weight: 600;
    letter-spacing: 2px;
    text-shadow: 0 0 20px rgba(0, 212, 255, 0.5);
}

.login-header p {
    font-size: 14px;
    color: #6a8baa;
    letter-spacing: 1px;
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    position: relative;
}

.form-group label {
    display: block;
    font-size: 14px;
    color: #8fb4d1;
    margin-bottom: 8px;
    font-weight: 500;
}

.form-group input[type="text"],
.form-group input[type="password"] {
    width: 100%;
    height: 48px;
    padding: 0 16px;
    background: rgba(0, 212, 255, 0.05);
    border: 1px solid rgba(0, 212, 255, 0.3);
    border-radius: 8px;
    color: #fff;
    font-size: 15px;
    transition: all 0.3s ease;
    outline: none;
}

.form-group input[type="text"]:focus,
.form-group input[type="password"]:focus {
    border-color: #00d4ff;
    box-shadow: 0 0 20px rgba(0, 212, 255, 0.2);
    background: rgba(0, 212, 255, 0.1);
}

.form-group input::placeholder {
    color: #4a6b8a;
}

.remember {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    color: #8fb4d1;
    font-size: 14px;
}

.remember input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: #00d4ff;
    cursor: pointer;
}

.login-btn {
    height: 50px;
    background: linear-gradient(90deg, #00d4ff 0%, #0066ff 100%);
    border: none;
    border-radius: 8px;
    color: #fff;
    font-size: 18px;
    font-weight: 600;
    letter-spacing: 4px;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.login-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.5s ease;
}

.login-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(0, 212, 255, 0.4);
}

.login-btn:hover::before {
    left: 100%;
}

.login-btn:active {
    transform: translateY(0);
}

.login-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.error-msg {
    text-align: center;
    color: #ff4757;
    font-size: 14px;
    min-height: 20px;
    padding: 8px;
    background: rgba(255, 71, 87, 0.1);
    border-radius: 6px;
    display: none;
}

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

.login-footer {
    margin-top: 25px;
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(0, 212, 255, 0.2);
}

.login-footer p {
    font-size: 12px;
    color: #4a6b8a;
}