:root {
    --primary-color: #4A90E2;
    --secondary-color: #7B61FF;
    --success-color: #50C878;
    --warning-color: #FFA500;
    --danger-color: #FF4757;
    --dark-color: #2C3E50;
    --light-color: #F8F9FA;
    --gray-color: #6C757D;
    --border-radius: 8px;
    --box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--dark-color);
    background-color: #f5f7fa;
}

/* Header Styles */
.main-header {
    background: white;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0.8rem 1.5rem;
}

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: var(--dark-color);
}

.logo-icon {
    font-size: 2rem;
    color: var(--primary-color);
    margin-right: 0.8rem;
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-main {
    font-size: 1.4rem;
    font-weight: 700;
}

.logo-sub {
    font-size: 0.8rem;
    color: var(--gray-color);
}

.main-nav ul {
    display: flex;
    list-style: none;
    gap: 1.5rem;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    color: var(--dark-color);
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
    background: var(--primary-color);
    color: white;
}

/* Dropdown Menu */
.dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: white;
    box-shadow: var(--box-shadow);
    border-radius: var(--border-radius);
    min-width: 200px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: var(--transition);
    z-index: 1000;
}

.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu a {
    display: block;
    padding: 0.8rem 1rem;
    text-decoration: none;
    color: var(--dark-color);
    transition: var(--transition);
}

.dropdown-menu a:hover {
    background: var(--light-color);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1.2rem;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    background: #357ABD;
}

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

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

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

.btn-large {
    padding: 0.8rem 2rem;
    font-size: 1.1rem;
}

/* Language Switcher */
.language-switcher {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin: 1rem 0;
}

.language-switcher a {
    padding: 0.3rem 1rem;
    border-radius: 20px;
    text-decoration: none;
    color: var(--gray-color);
    transition: var(--transition);
}

.language-switcher a.active,
.language-switcher a:hover {
    background: var(--primary-color);
    color: white;
}

/* Landing Page */
.landing-page {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

.hero-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
    margin-bottom: 4rem;
}

.hero-content h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--dark-color);
}

.subtitle {
    font-size: 1.2rem;
    color: var(--gray-color);
    margin-bottom: 2rem;
}

.hero-stats {
    display: flex;
    gap: 2rem;
    margin: 2rem 0;
}

.stat-item {
    text-align: center;
}

.stat-item i {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.stat-number {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--dark-color);
}

.stat-label {
    color: var(--gray-color);
    font-size: 0.9rem;
}

.hero-image img {
    max-width: 100%;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

/* Features Section */
.features-section {
    margin: 4rem 0;
}

.features-section h2 {
    text-align: center;
    margin-bottom: 3rem;
    font-size: 2.2rem;
}

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

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    transition: var(--transition);
    text-align: center;
}

.feature-card:hover {
    transform: translateY(-5px);
}

.feature-icon {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.feature-card h3 {
    margin-bottom: 1rem;
    color: var(--dark-color);
}

/* CTA Section */
.cta-section {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 4rem 2rem;
    border-radius: var(--border-radius);
    text-align: center;
    margin: 4rem 0;
}

.cta-section h2 {
    margin-bottom: 1rem;
    font-size: 2.5rem;
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 2rem;
}

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

/* Footer */
.main-footer {
    background: var(--dark-color);
    color: white;
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.footer-section h4 {
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.footer-section ul {
    list-style: none;
}

.footer-section a {
    color: #ccc;
    text-decoration: none;
    transition: var(--transition);
}

.footer-section a:hover {
    color: white;
}

.footer-bottom {
    text-align: center;
    margin-top: 2rem;
    padding-top: 1rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: #ccc;
}

/* Sidebar Styles */
.dashboard-sidebar {
    background: white;
    width: 260px;
    height: 100vh;
    position: fixed;
    left: 0;
    top: 0;
    box-shadow: 2px 0 10px rgba(0, 0, 0, 0.1);
    display: flex;
    flex-direction: column;
    transition: var(--transition);
    z-index: 999;
}

.sidebar-header {
    padding: 1.5rem;
    border-bottom: 1px solid #eee;
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.avatar {
    font-size: 2.5rem;
    color: var(--primary-color);
}

.username {
    font-size: 1.1rem;
    margin-bottom: 0.2rem;
}

.user-role {
    color: var(--gray-color);
    font-size: 0.9rem;
}

.sidebar-nav {
    flex: 1;
    padding: 1rem 0;
    overflow-y: auto;
}

.sidebar-menu {
    list-style: none;
}

.menu-header {
    padding: 1rem 1.5rem 0.5rem;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--gray-color);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.sidebar-link {
    display: flex;
    align-items: center;
    padding: 0.8rem 1.5rem;
    color: var(--dark-color);
    text-decoration: none;
    transition: var(--transition);
    position: relative;
}

.sidebar-link:hover,
.sidebar-link.active {
    background: var(--primary-color);
    color: white;
}

.sidebar-link i:first-child {
    width: 24px;
    text-align: center;
    margin-right: 0.8rem;
}

.badge {
    margin-left: auto;
    background: var(--gray-color);
    color: white;
    padding: 0.2rem 0.6rem;
    border-radius: 20px;
    font-size: 0.8rem;
}

.badge-success {
    background: var(--success-color);
}

.badge-warning {
    background: var(--warning-color);
}

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

.submenu {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.submenu a {
    padding-left: 3rem;
    padding-top: 0.6rem;
    padding-bottom: 0.6rem;
}

.submenu-toggle {
    margin-left: auto;
    transition: transform 0.3s ease;
}

.sidebar-footer {
    padding: 1rem;
    border-top: 1px solid #eee;
}

.quick-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1rem;
}

.stat-item {
    text-align: center;
}

.sidebar-toggle {
    width: 100%;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-section {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-stats {
        justify-content: center;
    }

    .header-actions {
        display: none;
    }

    .main-nav {
        position: fixed;
        top: 0;
        right: -100%;
        background: white;
        height: 100vh;
        width: 80%;
        max-width: 300px;
        transition: var(--transition);
        box-shadow: -2px 0 10px rgba(0, 0, 0, 0.1);
        z-index: 1001;
    }

    .main-nav.mobile-show {
        right: 0;
    }

    .main-nav ul {
        flex-direction: column;
        padding: 2rem;
    }

    .mobile-menu-toggle {
        display: block;
        background: none;
        border: none;
        font-size: 1.5rem;
        cursor: pointer;
    }

    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }

    .dashboard-sidebar {
        transform: translateX(-100%);
    }

    .dashboard-sidebar.show {
        transform: translateX(0);
    }
}

@media (min-width: 769px) {
    .mobile-menu-toggle {
        display: none;
    }
}