* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'PingFang SC', 'Helvetica Neue', Arial, sans-serif;
}

body {
    background: linear-gradient(135deg, #ff9a9e 0%, #fad0c4 50%, #fad0c4 100%);
    color: #333;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.container {
    width: 100%;
    max-width: 420px;
    margin: 0 auto;
}

.card {
    background: white;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
}

.header {
    background: linear-gradient(to right, #3a7bd5, #00d2ff);
    color: white;
    text-align: center;
    padding: 25px 20px;
}

.header h1 {
    font-size: 24px;
    margin-bottom: 10px;
    font-weight: 600;
}

.header p {
    opacity: 0.9;
    font-size: 14px;
}

.avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    border: 4px solid rgba(255, 255, 255, 0.3);
    margin: 0 auto 15px;
    background: #f5f5f5;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    color: #3a7bd5;
}

.content {
    padding: 25px;
}

.invite-info {
    text-align: center;
    margin-bottom: 25px;
    padding: 15px;
    background: #f8f9fa;
    border-radius: 10px;
}

.invite-info h2 {
    font-size: 18px;
    color: #3a7bd5;
    margin-bottom: 10px;
}

.invite-code {
    font-size: 28px;
    font-weight: bold;
    color: #ff6b6b;
    letter-spacing: 3px;
    margin: 10px 0;
}

.phone-input-container {
    margin-bottom: 20px;
}

.phone-input-container label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #555;
    font-size: 15px;
}

.input-wrapper {
    display: flex;
    align-items: center;
    background: #f5f7f9;
    border-radius: 8px;
    padding: 0 15px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.input-wrapper i {
    color: #3a7bd5;
    font-size: 20px;
    margin-right: 12px;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #555;
}

.input-group {
    display: flex;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

input {
    flex: 1;
    padding: 15px;
    border: none;
    background: #f5f7f9;
    font-size: 16px;
}

input:focus {
    outline: none;
    background: #edf2f7;
}

.btn {
    border: none;
    padding: 15px 20px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-primary {
    background: #3a7bd5;
    color: white;
}

.btn-primary:hover {
    background: #2c65b8;
}

.btn-large {
    display: block;
    width: 100%;
    padding: 16px;
    border-radius: 8px;
    text-align: center;
    font-size: 18px;
    margin-top: 30px;
}

.btn-success {
    background: #00c853;
    color: white;
}

.btn-success:hover {
    background: #00a843;
}

.countdown {
    color: #888;
    font-size: 14px;
    min-width: 80px;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
}

.footer {
    text-align: center;
    padding: 20px;
    color: #999;
    font-size: 14px;
}

.features {
    display: flex;
    justify-content: space-around;
    margin: 25px 0;
}

.feature {
    text-align: center;
    flex: 1;
}

.feature i {
    font-size: 24px;
    color: #3a7bd5;
    margin-bottom: 8px;
}

.feature p {
    font-size: 13px;
    color: #666;
}

@media (max-width: 480px) {
    .card {
        border-radius: 12px;
    }
    
    .header {
        padding: 20px 15px;
    }
    
    .content {
        padding: 20px 15px;
    }
    
    .input-group {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        border-radius: 8px;
        margin-top: 10px;
    }
}