:root {
    --pink-primary: #ff7eb3;
    --pink-secondary: #ff758c;
    --pink-deep: #ff4d94;
    --card-bg: rgba(20, 20, 20, 0.75);
}

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

body {
    font-family: 'Microsoft YaHei', 'Segoe UI', sans-serif;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    position: relative;
    overflow: hidden;
    background-color: transparent;
}

.bg-layer {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -100;
    overflow: hidden;
}

.bg-item {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 2s ease-in-out;
}

.bg-item.active {
    opacity: 1;
}

.bg-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -99;
    background: radial-gradient(ellipse at center, rgba(0,0,0,0.4) 0%, rgba(0,0,0,0.7) 100%);
    pointer-events: none;
}

.container {
    background: var(--card-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 126, 179, 0.3);
    border-radius: 16px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.8);
    padding: 40px;
    width: 100%;
    max-width: 400px;
    z-index: 10;
}

h1 {
    text-align: center;
    margin-bottom: 30px;
    font-size: 28px;
    background: linear-gradient(135deg, #fff 0%, var(--pink-primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 0 10px rgba(255, 77, 148, 0.4);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: rgba(255, 255, 255, 0.8);
    font-weight: 500;
    font-size: 14px;
}

.form-group input {
    width: 100%;
    padding: 12px 15px;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 8px;
    font-size: 16px;
    color: white;
    transition: all 0.3s ease;
}

.form-group input:focus {
    outline: none;
    border-color: var(--pink-primary);
    background: rgba(0, 0, 0, 0.5);
    box-shadow: 0 0 15px rgba(255, 126, 179, 0.3);
}

.form-group input::placeholder {
    color: rgba(255, 255, 255, 0.4);
}

.btn {
    width: 100%;
    padding: 14px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    justify-content: center;
    align-items: center;
}

.btn-primary {
    background: linear-gradient(90deg, var(--pink-deep), var(--pink-primary));
    color: white;
    box-shadow: 0 4px 15px rgba(255, 77, 148, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 77, 148, 0.5);
    filter: brightness(1.1);
}

.btn-secondary {
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: rgba(255, 255, 255, 0.6);
}

.btn-secondary:hover {
    border-color: var(--pink-primary);
    color: #fff;
    background: rgba(255, 255, 255, 0.08);
}

.error {
    background-color: rgba(220, 53, 69, 0.2);
    border: 1px solid rgba(220, 53, 69, 0.3);
    color: #ff6b6b;
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 20px;
    text-align: center;
}

.success {
    background-color: rgba(40, 167, 69, 0.2);
    border: 1px solid rgba(40, 167, 69, 0.3);
    color: #81c784;
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 20px;
    text-align: center;
}

.link {
    text-align: center;
    margin-top: 20px;
}

.link a {
    color: var(--pink-primary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.link a:hover {
    color: var(--pink-deep);
    text-decoration: underline;
}

@media (max-width: 480px) {
    .container {
        padding: 30px 20px;
    }
    h1 {
        font-size: 24px;
        margin-bottom: 20px;
    }
    .form-group input {
        padding: 10px 12px;
    }
}