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

:root {
    --primary-color: #3498db;
    --primary-dark: #2980b9;
    --secondary-color: #2ecc71;
    --secondary-dark: #27ae60;
    --danger-color: #e74c3c;
    --warning-color: #f39c12;
    --light-color: #ecf0f1;
    --dark-color: #2c3e50;
    --gray-color: #7f8c8d;
    --border-radius: 8px;
    --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--dark-color);
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
    padding: 20px;
}

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

/* Header */
header {
    text-align: center;
    margin-bottom: 40px;
    padding: 20px;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

h1 {
    color: var(--primary-color);
    margin-bottom: 10px;
    font-size: 2.5rem;
}

.subtitle {
    color: var(--gray-color);
    font-size: 1.1rem;
}

/* Main Content */
main {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
}

.config-section, .result-section, .instructions {
    background: white;
    border-radius: var(--border-radius);
    padding: 30px;
    box-shadow: var(--box-shadow);
}

/* Form Styles */
.form-group {
    margin-bottom: 25px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--dark-color);
}

input[type="text"],
input[type="number"],
textarea {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #e0e0e0;
    border-radius: var(--border-radius);
    font-size: 16px;
    transition: var(--transition);
}

input[type="text"]:focus,
input[type="number"]:focus,
textarea:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
}

textarea {
    min-height: 150px;
    resize: vertical;
    font-family: 'Courier New', monospace;
    font-size: 14px;
    line-height: 1.5;
}

.help-text {
    font-size: 14px;
    color: var(--gray-color);
    margin-top: 5px;
}

/* Country Selection */
.countries-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 15px;
    margin-top: 10px;
}

.country-checkbox {
    background: var(--light-color);
    border-radius: var(--border-radius);
    padding: 15px;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
}

.country-checkbox:hover {
    background: #e0e7ff;
    transform: translateY(-2px);
}

.country-checkbox.selected {
    background: #dbeafe;
    border-color: var(--primary-color);
}

.country-checkbox input {
    margin-right: 10px;
}

.country-flag {
    font-size: 24px;
    margin-right: 10px;
}

/* Buttons */
.buttons {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
    margin-top: 30px;
}

button {
    padding: 12px 24px;
    border: none;
    border-radius: var(--border-radius);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

.btn-secondary {
    background: var(--light-color);
    color: var(--dark-color);
}

.btn-secondary:hover {
    background: #d5dbdb;
}

.btn-small {
    padding: 8px 15px;
    font-size: 14px;
    margin-left: 10px;
}

/* Result Section */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.subscription-box {
    margin-bottom: 30px;
}

/* QR Code */
.qr-section {
    margin-bottom: 30px;
    text-align: center;
}

.qr-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
    margin-top: 20px;
}

#qrcode {
    background: white;
    padding: 20px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.qr-help {
    color: var(--gray-color);
    font-size: 14px;
}

/* Individual Links */
.individual-links {
    margin-top: 30px;
}

.links-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 15px;
    margin-top: 15px;
}

.link-item {
    background: var(--light-color);
    border-radius: var(--border-radius);
    padding: 15px;
    font-family: 'Courier New', monospace;
    font-size: 14px;
    word-break: break-all;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.link-country {
    font-weight: bold;
    margin-right: 10px;
    min-width: 60px;
}

.link-copy {
    background: none;
    border: none;
    color: var(--primary-color);
    cursor: pointer;
    padding: 5px;
}

.link-copy:hover {
    color: var(--primary-dark);
}

/* Instructions */
.instructions h2 {
    margin-bottom: 20px;
    color: var(--primary-color);
}

.instructions ol, .instructions ul {
    margin-left: 20px;
    margin-bottom: 20px;
}

.instructions li {
    margin-bottom: 8px;
}

.note {
    background: #fff9e6;
    border-left: 4px solid var(--warning-color);
    padding: 20px;
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
}

.note h3 {
    color: var(--warning-color);
    margin-bottom: 10px;
}

/* Footer */
footer {
    text-align: center;
    margin-top: 40px;
    padding: 20px;
    color: var(--gray-color);
    font-size: 14px;
}

/* Responsive */
@media (max-width: 768px) {
    main {
        grid-template-columns: 1fr;
    }
    
    .countries-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    }
    
    .links-container {
        grid-template-columns: 1fr;
    }
    
    .buttons {
        flex-direction: column;
    }
    
    button {
        width: 100%;
    }
    
    .btn-small {
        width: auto;
        margin-top: 10px;
    }
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: 20px;
    right: 20px;
    padding: 15px 25px;
    background: var(--secondary-color);
    color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    z-index: 1000;
    opacity: 0;
    transform: translateY(20px);
    transition: var(--transition);
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
}