/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    min-height: 100vh;
    padding: 40px 20px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

h1 {
    text-align: center;
    color: white;
    font-size: 2.5rem;
    margin-bottom: 50px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

/* Plan Cards */
.plans {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.plan-card {
    background: white;
    border-radius: 20px;
    padding: 40px 30px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.plan-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0,0,0,0.3);
}

.plan-card.popular::before {
    content: 'POPULAIR';
    position: absolute;
    top: 20px;
    right: -35px;
    background: #f59e0b;
    color: white;
    padding: 5px 40px;
    transform: rotate(45deg);
    font-size: 0.8rem;
    font-weight: bold;
}

.plan-name {
    font-size: 1.8rem;
    color: #333;
    margin-bottom: 15px;
    font-weight: bold;
}

.plan-price {
    font-size: 3rem;
    color: #10b981;
    margin-bottom: 10px;
    font-weight: bold;
}

.plan-price span {
    font-size: 1.2rem;
    color: #666;
}

.plan-features {
    list-style: none;
    margin: 30px 0;
}

.plan-features li {
    padding: 10px 0;
    color: #555;
    border-bottom: 1px solid #eee;
}

.plan-features li:before {
    content: '✓ ';
    color: #10b981;
    font-weight: bold;
    margin-right: 10px;
}

/* Buttons */
.select-btn {
    width: 100%;
    padding: 15px;
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 1.1rem;
    font-weight: bold;
    cursor: pointer;
    transition: opacity 0.3s ease;
}

.select-btn:hover {
    opacity: 0.9;
}

.submit-btn {
    width: 100%;
    padding: 15px;
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 1.1rem;
    font-weight: bold;
    cursor: pointer;
    margin-top: 20px;
}

.submit-btn:hover {
    opacity: 0.9;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.7);
    z-index: 1000;
    overflow-y: auto;
}

.modal-content {
    background: white;
    max-width: 600px;
    margin: 50px auto;
    padding: 40px;
    border-radius: 20px;
    position: relative;
}

.close {
    position: absolute;
    top: 20px;
    right: 30px;
    font-size: 2rem;
    cursor: pointer;
    color: #999;
}

.close:hover {
    color: #333;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: #333;
    font-weight: 600;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 2px solid #e5e7eb;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #10b981;
}

.sepa-info {
    background: #f3f4f6;
    padding: 15px;
    border-radius: 8px;
    margin: 20px 0;
    font-size: 0.9rem;
    color: #555;
}

/* Admin Link */
.admin-link {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: rgba(255,255,255,0.2);
    color: white;
    padding: 10px 20px;
    border-radius: 50px;
    text-decoration: none;
    backdrop-filter: blur(10px);
    transition: background 0.3s ease;
}

.admin-link:hover {
    background: rgba(255,255,255,0.3);
}

/* Success Page */
.success-card {
    background: white;
    padding: 60px 40px;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    text-align: center;
    max-width: 500px;
}

.checkmark {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: #10b981;
    margin: 0 auto 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: white;
}

.reference {
    background: #f3f4f6;
    padding: 15px;
    border-radius: 8px;
    margin: 30px 0;
    font-family: monospace;
    color: #333;
}

.btn {
    display: inline-block;
    padding: 15px 40px;
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: white;
    text-decoration: none;
    border-radius: 10px;
    margin-top: 20px;
    font-weight: bold;
    transition: opacity 0.3s ease;
}

.btn:hover {
    opacity: 0.9;
}

/* Login Page */
.login-card {
    background: white;
    padding: 50px 40px;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    width: 100%;
    max-width: 400px;
}

.error {
    background: #fee2e2;
    color: #991b1b;
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 20px;
    text-align: center;
}

.back-link {
    display: block;
    text-align: center;
    margin-top: 20px;
    color: #10b981;
    text-decoration: none;
}

.back-link:hover {
    text-decoration: underline;
}