:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --background: #f8fafc;
    --surface: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
}

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

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;
}

/* Pages */
.page {
    display: none;
}

.page.active {
    display: block;
}

/* Login/Register Pages */
.login-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.logo {
    text-align: center;
    margin-bottom: 2rem;
    color: white;
}

.logo h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.tagline {
    font-size: 1.1rem;
    opacity: 0.9;
}

.login-box {
    background: var(--surface);
    padding: 2.5rem;
    border-radius: 1rem;
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 450px;
}

.login-box h2 {
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    font-size: 1.5rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.btn-primary {
    width: 100%;
    padding: 0.875rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 0.5rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.3s;
}

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

.btn-primary:disabled {
    background: var(--secondary-color);
    cursor: not-allowed;
}

.btn-secondary {
    padding: 0.5rem 1rem;
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-secondary:hover {
    background: var(--background);
}

.register-link {
    text-align: center;
    margin-top: 1.5rem;
}

.register-link a {
    color: var(--primary-color);
    text-decoration: none;
}

.register-link a:hover {
    text-decoration: underline;
}

/* License Input */
.license-input-group {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    margin: 2rem 0;
}

.license-part {
    width: 4rem;
    padding: 0.75rem;
    text-align: center;
    font-size: 1.2rem;
    font-weight: 600;
    border: 2px solid var(--border-color);
    border-radius: 0.5rem;
    text-transform: uppercase;
}

.license-part:focus {
    outline: none;
    border-color: var(--primary-color);
}

.info-text {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1rem;
    text-align: center;
}

/* Navbar */
.navbar {
    background: var(--surface);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow);
}

.nav-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* Dashboard Layout */
.dashboard-container {
    display: flex;
    min-height: calc(100vh - 64px);
}

/* Sidebar */
.sidebar {
    width: 260px;
    background: var(--surface);
    border-right: 1px solid var(--border-color);
    padding: 1.5rem 0;
}

.menu {
    list-style: none;
}

.menu-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.875rem 1.5rem;
    cursor: pointer;
    transition: all 0.3s;
    color: var(--text-secondary);
}

.menu-item:hover {
    background: var(--background);
    color: var(--text-primary);
}

.menu-item.active {
    background: linear-gradient(90deg, rgba(37, 99, 235, 0.1) 0%, transparent 100%);
    color: var(--primary-color);
    border-right: 3px solid var(--primary-color);
}

.menu-item .icon {
    font-size: 1.25rem;
}

.menu-item .badge {
    margin-left: auto;
    padding: 0.25rem 0.5rem;
    background: var(--primary-color);
    color: white;
    font-size: 0.7rem;
    border-radius: 0.25rem;
}

.menu-separator {
    height: 1px;
    background: var(--border-color);
    margin: 1rem 0;
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 2rem;
    overflow-y: auto;
}

.content-section {
    display: none;
}

.content-section.active {
    display: block;
    animation: fadeIn 0.3s;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.content-section h1 {
    font-size: 2rem;
    margin-bottom: 2rem;
    color: var(--text-primary);
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--surface);
    padding: 1.5rem;
    border-radius: 0.75rem;
    box-shadow: var(--shadow);
}

.stat-card h3 {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.stat-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Modules Grid */
.modules-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
}

.module-card {
    background: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    padding: 1.5rem;
    transition: all 0.3s;
}

.module-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.module-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.module-icon {
    font-size: 2rem;
}

.module-header h3 {
    flex: 1;
    font-size: 1.1rem;
    color: var(--text-primary);
}

.module-status {
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.75rem;
    font-weight: 600;
}

.module-status.active {
    background: #d1fae5;
    color: var(--success-color);
}

.module-status.inactive {
    background: #fee2e2;
    color: var(--danger-color);
}

.module-card p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

.btn-card {
    width: 100%;
    padding: 0.625rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 0.5rem;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.3s;
}

.btn-card:hover {
    background: var(--primary-hover);
}

/* Subscription */
.subscription-container {
    max-width: 1200px;
}

.subscription-current,
.subscription-modules,
.subscription-pricing {
    margin-bottom: 3rem;
}

.subscription-box {
    background: var(--surface);
    padding: 2rem;
    border-radius: 0.75rem;
    border: 2px solid var(--primary-color);
    max-width: 500px;
}

.subscription-box h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.price {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin: 1rem 0;
}

.billing-info {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.modules-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.module-subscription-card {
    background: var(--surface);
    padding: 1.5rem;
    border-radius: 0.75rem;
    border: 1px solid var(--border-color);
}

.module-subscription-card h3 {
    margin-bottom: 0.5rem;
}

.module-subscription-card p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.pricing-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 1.5rem;
}

.pricing-card {
    background: var(--surface);
    padding: 2rem;
    border-radius: 0.75rem;
    border: 2px solid var(--border-color);
    position: relative;
    transition: all 0.3s;
}

.pricing-card:hover {
    box-shadow: var(--shadow-lg);
}

.pricing-card.featured {
    border-color: var(--primary-color);
    transform: scale(1.05);
}

.badge-save {
    position: absolute;
    top: -12px;
    right: 20px;
    background: var(--success-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.75rem;
    font-weight: 600;
}

.pricing-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.price-big {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.price-period {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.features {
    list-style: none;
    margin-bottom: 1.5rem;
}

.features li {
    padding: 0.5rem 0;
    color: var(--text-secondary);
}

/* Invoices Table */
.invoices-container {
    background: var(--surface);
    border-radius: 0.75rem;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.invoices-table {
    width: 100%;
    border-collapse: collapse;
}

.invoices-table thead {
    background: var(--background);
}

.invoices-table th {
    padding: 1rem;
    text-align: left;
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.85rem;
    text-transform: uppercase;
}

.invoices-table td {
    padding: 1rem;
    border-top: 1px solid var(--border-color);
}

.invoice-status {
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.8rem;
    font-weight: 600;
}

.invoice-status.paid {
    background: #d1fae5;
    color: var(--success-color);
}

.invoice-status.pending {
    background: #fef3c7;
    color: var(--warning-color);
}

.btn-download {
    padding: 0.5rem 1rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 0.375rem;
    cursor: pointer;
    font-size: 0.875rem;
}

.btn-download:hover {
    background: var(--primary-hover);
}

/* Tool Container */
.tool-container {
    background: var(--surface);
    padding: 2rem;
    border-radius: 0.75rem;
    box-shadow: var(--shadow);
}

/* Responsive */
@media (max-width: 768px) {
    .dashboard-container {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }

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

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

    .pricing-cards {
        grid-template-columns: 1fr;
    }

    .pricing-card.featured {
        transform: scale(1);
    }
}