:root {
    --bg-color: #0a192f;
    --card-bg: rgba(17, 34, 64, 0.7);
    --accent-color: #64ffda;
    --text-primary: #e6f1ff;
    --text-secondary: #8892b0;
    --input-bg: rgba(255, 255, 255, 0.05);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.background-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 50% 50%, #112240 0%, #0a192f 100%);
    z-index: -1;
}

/* 动态背景点缀 */
.background-overlay::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%2364ffda' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.3;
    z-index: -1;
}

.container {
    width: 100%;
    max-width: 450px;
    padding: 20px;
    animation: fadeIn 0.8s ease-out;
}

.glass-card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 24px;
    padding: 40px;
    text-align: center;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.logo {
    color: var(--accent-color);
    margin-bottom: 24px;
    display: inline-block;
    filter: drop-shadow(0 0 8px rgba(100, 255, 218, 0.3));
}

h1 {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 12px;
    letter-spacing: -0.5px;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 15px;
    margin-bottom: 32px;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

input {
    width: 100%;
    background: var(--input-bg);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    padding: 16px;
    color: white;
    font-size: 16px;
    transition: all 0.3s ease;
    text-align: center;
}

input:focus {
    outline: none;
    border-color: var(--accent-color);
    background: rgba(255, 255, 255, 0.08);
    box-shadow: 0 0 0 4px rgba(100, 255, 218, 0.1);
}

button {
    width: 100%;
    background: linear-gradient(135deg, #64ffda 0%, #48d1cc 100%);
    color: #0a192f;
    border: none;
    border-radius: 12px;
    padding: 16px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px -10px rgba(100, 255, 218, 0.5);
    filter: brightness(1.1);
}

button:active {
    transform: translateY(0);
}

.footer {
    margin-top: 40px;
    font-size: 12px;
    color: var(--text-secondary);
    opacity: 0.6;
}

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

/* 响应式微调 */
@media (max-width: 480px) {
    .glass-card {
        padding: 30px 20px;
    }
    h1 {
        font-size: 24px;
    }
}