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

:root {
    --primary-color: #4F46E5;
    --success-color: #10B981;
    --danger-color: #EF4444;
    --warning-color: #F59E0B;
    --background: #F9FAFB;
    --card-background: #FFFFFF;
    --text-primary: #111827;
    --text-secondary: #6B7280;
    --border-color: #E5E7EB;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
.header {
    text-align: center;
    padding: 40px 20px;
}

.header h1 {
    font-size: 36px;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 18px;
}

/* Main Content */
.main-content {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

/* Card */
.card {
    background: var(--card-background);
    border-radius: 12px;
    padding: 30px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    border: 1px solid var(--border-color);
}

.card h2 {
    font-size: 24px;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.card h3 {
    font-size: 18px;
    margin-bottom: 12px;
    color: var(--text-primary);
}

/* Status Box */
.status-box {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px;
    background: #F3F4F6;
    border-radius: 8px;
    margin-bottom: 20px;
}

.status-indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--secondary-color);
    animation: pulse 2s infinite;
}

.status-indicator.active {
    background: var(--success-color);
}

.status-indicator.inactive {
    background: var(--danger-color);
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.status-text {
    font-weight: 500;
}

/* Form */
.subscription-form {
    margin-bottom: 20px;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

/* Buttons */
.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
    display: inline-block;
}

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

.btn-primary:hover {
    background: #4338CA;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
}

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

.btn-secondary:hover {
    background: #4B5563;
}

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

.btn-danger:hover {
    background: #DC2626;
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
}

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

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Info Box */
.info-box {
    background: #EEF2FF;
    border: 1px solid #C7D2FE;
    border-radius: 8px;
    padding: 20px;
    margin-top: 20px;
}

.info-box h3 {
    color: var(--primary-color);
    margin-bottom: 12px;
}

.info-box p {
    margin: 8px 0;
    font-size: 14px;
}

.info-box code {
    background: white;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 12px;
    word-break: break-all;
}

/* Info Card */
.info-card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.info-card h2,
.info-card h3 {
    color: white;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.info-item {
    background: rgba(255, 255, 255, 0.1);
    padding: 20px;
    border-radius: 8px;
}

.info-item ul {
    margin-left: 20px;
    margin-top: 10px;
}

.info-item li {
    margin: 8px 0;
}

.info-item .btn-outline {
    border-color: white;
    color: white;
    margin-top: 16px;
}

.info-item .btn-outline:hover {
    background: white;
    color: var(--primary-color);
}

/* Browser Info */
.browser-info p {
    margin: 12px 0;
    font-size: 15px;
}

.browser-info span {
    font-weight: 600;
    color: var(--success-color);
}

.browser-info span.not-supported {
    color: var(--danger-color);
}

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

/* Responsive */
@media (max-width: 768px) {
    .header h1 {
        font-size: 28px;
    }

    .card {
        padding: 20px;
    }

    .info-grid {
        grid-template-columns: 1fr;
    }
}