:root {
    --primary-color: #0891b2;
    --primary-dark: #0c4a6e;
    --text-color: #334155;
    --bg-color: #f8fafc;
    --sidebar-width: 280px;
    --header-height: 60px;
    --border-color: #e2e8f0;
    --success-color: #22c55e;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    color: var(--text-color);
    background: var(--bg-color);
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: white;
    border-right: 1px solid var(--border-color);
    position: fixed;
    height: 100vh;
    overflow-y: auto;
    padding: 2rem 1rem;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 2rem;
    padding: 0 1rem;
    display: flex;
    align-items: center;
    text-decoration: none;
}

.logo img {
    height: 40px;
    width: auto;
    margin-right: 8px;
    object-fit: contain;
}

.logo span {
    vertical-align: middle;
}

.nav-group {
    margin-bottom: 2rem;
}

.nav-header {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: #94a3b8;
    margin-bottom: 0.75rem;
    padding: 0 1rem;
    font-weight: 600;
}

.nav-link {
    display: block;
    padding: 0.75rem 1rem;
    color: #64748b;
    text-decoration: none;
    border-radius: 0.5rem;
    transition: all 0.2s;
    font-size: 0.95rem;
    cursor: pointer;
}

.nav-link:hover, .nav-link.active {
    background: #e0f2fe;
    color: var(--primary-color);
    font-weight: 500;
}

/* Main Content */
.main-content {
    margin-left: var(--sidebar-width);
    flex: 1;
    padding: 3rem 4rem;
    max-width: 1200px;
}

section {
    margin-bottom: 4rem;
    padding-top: 1rem;
    display: none;
}

section.active {
    display: block;
    animation: fadeIn 0.3s ease-in-out;
}

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

h1 {
    font-size: 2.5rem;
    color: #0f172a;
    margin-bottom: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.025em;
}

h2 {
    font-size: 1.75rem;
    color: #1e293b;
    margin: 2.5rem 0 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

h3 {
    font-size: 1.25rem;
    color: #334155;
    margin: 1.5rem 0 0.75rem;
}

p {
    line-height: 1.7;
    margin-bottom: 1rem;
    color: #475569;
}

ul, ol {
    margin-bottom: 1.5rem;
    padding-left: 1.5rem;
}

li {
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

/* Code Blocks */
pre {
    background: #1e293b;
    color: #e2e8f0;
    padding: 1.25rem;
    border-radius: 0.75rem;
    overflow-x: auto;
    margin: 1.5rem 0;
    font-size: 0.9rem;
    font-family: 'Fira Code', monospace;
    position: relative;
}

code {
    font-family: 'Fira Code', monospace;
}

p code {
    background: #f1f5f9;
    padding: 0.2rem 0.4rem;
    border-radius: 0.25rem;
    font-size: 0.9em;
    color: #0f172a;
}

/* Alerts */
.alert {
    padding: 1rem 1.25rem;
    border-radius: 0.5rem;
    margin-bottom: 1.5rem;
    border-left: 4px solid;
}

.alert-info {
    background-color: #eff6ff;
    border-color: #3b82f6;
    color: #1e40af;
}

.alert-warning {
    background-color: #fffbeb;
    border-color: #f59e0b;
    color: #92400e;
}

.alert-success {
    background-color: #f0fdf4;
    border-color: #22c55e;
    color: #166534;
}

/* Tabs within content */
.tabs {
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 1.5rem;
    display: flex;
    gap: 1rem;
}

.tab-btn {
    padding: 0.75rem 0;
    background: none;
    border: none;
    color: #64748b;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.2s;
}

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

.tab-btn.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* Screenshots */
.screenshot {
    width: 100%;
    border-radius: 0.75rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    margin: 1.5rem 0;
    border: 1px solid var(--border-color);
}

.img-caption {
    text-align: center;
    font-size: 0.875rem;
    color: #64748b;
    margin-top: -1rem;
    margin-bottom: 2rem;
}

/* Feature Highlights */
.feature-highlight {
    background: linear-gradient(135deg, #e0f2fe 0%, #f0f9ff 100%);
    border: 2px solid #bae6fd;
    border-radius: 1rem;
    padding: 2rem;
    margin: 2rem 0;
    display: flex;
    gap: 1.5rem;
    align-items: flex-start;
}

.feature-highlight-icon {
    font-size: 3rem;
    flex-shrink: 0;
}

.feature-highlight-content h3 {
    margin-top: 0;
    color: var(--primary-dark);
    font-size: 1.5rem;
}

/* Platform Grid */
.platform-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.platform-card {
    background: white;
    border: 2px solid var(--border-color);
    border-radius: 1rem;
    padding: 2rem;
    text-align: center;
    transition: all 0.3s ease;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.platform-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px -5px rgba(8, 145, 178, 0.2);
    border-color: var(--primary-color);
}

.platform-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.platform-card h3 {
    color: var(--primary-dark);
    margin-top: 0;
}

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.feature-card {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    padding: 1.5rem;
    transition: all 0.3s ease;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.feature-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 16px rgba(8, 145, 178, 0.15);
    border-color: var(--primary-color);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    color: var(--primary-dark);
    margin-top: 0;
    font-size: 1.25rem;
}

/* Roles Grid */
.roles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.role-card {
    background: white;
    border: 2px solid var(--border-color);
    border-radius: 1rem;
    padding: 1.5rem;
    text-align: center;
    transition: all 0.3s ease;
    position: relative;
}

.role-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(8, 145, 178, 0.15);
    border-color: var(--primary-color);
}

.role-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.role-card h3 {
    color: var(--primary-dark);
    margin: 0.5rem 0;
}

.role-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.75rem;
    font-weight: 600;
    margin-top: 0.5rem;
}

.role-badge.web {
    background: #e0f2fe;
    color: var(--primary-dark);
}

.role-badge.mobile {
    background: #dcfce7;
    color: #15803d;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.stat-card {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    border-radius: 1rem;
    padding: 2rem;
    text-align: center;
    box-shadow: 0 4px 6px rgba(8, 145, 178, 0.2);
}

.stat-number {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 1rem;
    opacity: 0.9;
}

/* Gateway Grid */
.gateway-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.gateway-card {
    background: white;
    border: 2px solid var(--success-color);
    border-radius: 0.75rem;
    padding: 1.5rem;
    text-align: center;
    transition: all 0.3s ease;
}

.gateway-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 16px rgba(34, 197, 94, 0.2);
}

.gateway-card h3 {
    color: var(--success-color);
    margin-top: 0;
}

/* Enhanced Alerts */
.alert {
    padding: 1.25rem 1.5rem;
    border-radius: 0.75rem;
    margin-bottom: 1.5rem;
    border-left: 4px solid;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        z-index: 1000;
        transition: transform 0.3s;
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
        padding: 2rem;
    }
    
    .mobile-menu-toggle {
        display: block;
        position: fixed;
        bottom: 20px;
        right: 20px;
        background: var(--primary-color);
        color: white;
        width: 50px;
        height: 50px;
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
        z-index: 1001;
        border: none;
        cursor: pointer;
    }
}