:root {
    --primary: #6C5CE7;
    --secondary: #A29BFE;
    --success: #00B894;
    --gold: #FFD700;
    --bg: #0a0e27;
    --card-bg: #1a1f3a;
    --text: #ffffff;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #0a0e27 0%, #1a1f3a 100%);
    color: var(--text);
    padding: 15px;
    min-height: 100vh;
}

.container {
    max-width: 500px;
    margin: 0 auto;
}

/* 3D Header with Animation */
.header {
    text-align: center;
    margin-bottom: 25px;
    padding: 30px 20px;
    background: linear-gradient(135deg, rgba(108,92,231,0.2), rgba(162,155,254,0.2));
    border-radius: 20px;
    border: 2px solid rgba(108,92,231,0.3);
    box-shadow: 0 8px 32px rgba(108,92,231,0.3);
    position: relative;
    overflow: hidden;
}

.header::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent, rgba(255,255,255,0.05), transparent);
    transform: rotate(45deg);
    animation: shine 3s infinite;
}

@keyframes shine {
    0% { transform: translateX(-100%) rotate(45deg); }
    100% { transform: translateX(100%) rotate(45deg); }
}

.diamond-3d {
    font-size: 80px;
    animation: float 3s ease-in-out infinite;
    filter: drop-shadow(0 10px 20px rgba(108,92,231,0.5));
}

@keyframes float {
    0%, 100% { transform: translateY(0px) rotateY(0deg); }
    50% { transform: translateY(-20px) rotateY(180deg); }
}

.header h1 {
    font-size: 28px;
    margin: 15px 0 10px;
    background: linear-gradient(135deg, var(--gold), var(--primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 0 30px rgba(255,215,0,0.5);
}

.subtitle {
    opacity: 0.9;
    font-size: 14px;
    color: var(--secondary);
}

/* Card */
.card {
    background: var(--card-bg);
    border-radius: 20px;
    padding: 25px;
    margin-bottom: 20px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.3);
    border: 1px solid rgba(255,255,255,0.1);
}

.card h2 {
    font-size: 20px;
    margin-bottom: 20px;
    color: var(--gold);
}

/* Form */
.form-group {
    margin-bottom: 18px;
}

.form-group label {
    display: block;
    margin-bottom: 10px;
    font-size: 14px;
    font-weight: 600;
    color: var(--secondary);
}

.form-group input {
    width: 100%;
    padding: 14px;
    background: rgba(255,255,255,0.05);
    border: 2px solid rgba(108,92,231,0.3);
    border-radius: 12px;
    color: var(--text);
    font-size: 16px;
    transition: all 0.3s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 20px rgba(108,92,231,0.4);
}

/* Packages Grid */
.packages-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
}

.package {
    background: linear-gradient(135deg, rgba(108,92,231,0.15), rgba(162,155,254,0.15));
    border: 2px solid rgba(108,92,231,0.3);
    border-radius: 16px;
    padding: 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}

.package::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent, rgba(255,255,255,0.1), transparent);
    transform: rotate(45deg);
    transition: 0.5s;
}

.package:hover::before {
    left: 100%;
}

.package:hover, .package.selected {
    transform: translateY(-8px) scale(1.05);
    border-color: var(--gold);
    box-shadow: 0 12px 40px rgba(255,215,0,0.4);
    background: linear-gradient(135deg, rgba(255,215,0,0.2), rgba(108,92,231,0.2));
}

.package .diamond-icon {
    font-size: 40px;
    margin-bottom: 10px;
}

.package .amount {
    font-size: 22px;
    font-weight: bold;
    color: var(--gold);
    margin-bottom: 8px;
}

.package .price {
    font-size: 16px;
    color: var(--success);
    font-weight: 600;
}

/* Button */
.btn-primary {
    width: 100%;
    padding: 16px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border: none;
    border-radius: 12px;
    color: white;
    font-size: 18px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 6px 20px rgba(108,92,231,0.4);
    margin-top: 15px;
}

.btn-primary:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 10px 30px rgba(108,92,231,0.6);
}

/* Summary */
.summary-item {
    display: flex;
    justify-content: space-between;
    padding: 12px 0;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.summary-item:last-child {
    border-bottom: none;
    font-size: 20px;
    font-weight: bold;
    color: var(--gold);
    padding-top: 18px;
}