:root {
    /* EduFlow Brand Colors */
    --primary-600: #1e3a8a;
    --primary-700: #1e40af;
    --primary-500: #3b82f6;
    --secondary-600: #10b981;
    --secondary-700: #059669;

    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;

    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --info: #3b82f6;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--gray-800);
    background: var(--gray-50);
    overflow-x: hidden;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--gray-200);
    z-index: 1000;
    transition: all var(--transition-base);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    text-decoration: none;
    min-width: 200px;
    /* Ensure space for the wide logo */
}

/* .logo-icon class removed as it is not used and might cause confusion */

.brand-name {
    display: none !important;
    /* Force hide legacy text */
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
}

.nav-link {
    color: var(--gray-700);
    text-decoration: none;
    font-weight: 500;
    font-size: var(--font-size-sm);
    transition: color var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-600), var(--secondary-600));
    transition: width var(--transition-base);
}

.nav-link:hover {
    color: var(--primary-600);
}

.nav-link:hover::after {
    width: 100%;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background: var(--gray-700);
    transition: all var(--transition-base);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 0.625rem 1.25rem;
    font-size: var(--font-size-sm);
    font-weight: 600;
    border-radius: var(--radius-lg);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    font-family: var(--font-family);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-600), var(--secondary-600));
    color: white;
    box-shadow: var(--shadow-md);
}

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

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background: white;
    color: var(--gray-700);
    border: 1px solid var(--gray-300);
}

.btn-secondary:hover {
    background: var(--gray-50);
    border-color: var(--gray-400);
}

.btn-outline {
    background: transparent;
    color: var(--primary-600);
    border: 2px solid var(--primary-600);
}

.btn-outline:hover {
    background: var(--primary-600);
    color: white;
}

.btn-large {
    padding: 0.875rem 1.75rem;
    font-size: var(--font-size-base);
}

.btn-icon {
    width: 20px;
    height: 20px;
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 72px;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 0;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.3;
    animation: float 20s infinite ease-in-out;
}

.orb-1 {
    width: 500px;
    height: 500px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    top: -200px;
    left: -100px;
}

.orb-2 {
    width: 400px;
    height: 400px;
    background: linear-gradient(135deg, #f093fb, #f5576c);
    top: 20%;
    right: -150px;
    animation-delay: -5s;
}

.orb-3 {
    width: 350px;
    height: 350px;
    background: linear-gradient(135deg, #4facfe, #00f2fe);
    bottom: -100px;
    left: 30%;
    animation-delay: -10s;
}

@keyframes float {

    0%,
    100% {
        transform: translate(0, 0) scale(1);
    }

    33% {
        transform: translate(30px, -30px) scale(1.1);
    }

    66% {
        transform: translate(-20px, 20px) scale(0.9);
    }
}

.hero-container {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.hero-content {
    max-width: 600px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 0.5rem 1rem;
    background: rgba(255, 255, 255, 0.9);
    border: 1px solid var(--gray-200);
    border-radius: 999px;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
}

.badge-icon {
    font-size: var(--font-size-lg);
}

.hero-title {
    font-size: var(--font-size-5xl);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--spacing-lg);
    color: var(--gray-900);
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary-600), var(--secondary-600));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: var(--font-size-lg);
    color: var(--gray-600);
    margin-bottom: var(--spacing-2xl);
    line-height: 1.7;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-2xl);
}

.hero-stats {
    display: flex;
    gap: var(--spacing-2xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--gray-200);
}

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

.stat-number {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-600), var(--secondary-600));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--gray-600);
    margin-top: var(--spacing-xs);
}

/* Dashboard Preview */
.hero-visual {
    position: relative;
}

.dashboard-preview {
    background: white;
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-2xl);
    overflow: hidden;
    transform: perspective(1000px) rotateY(-5deg);
    transition: transform var(--transition-slow);
}

.dashboard-preview:hover {
    transform: perspective(1000px) rotateY(0deg);
}

.preview-header {
    background: linear-gradient(135deg, var(--primary-600), var(--secondary-600));
    padding: var(--spacing-md);
}

.preview-dots {
    display: flex;
    gap: 6px;
}

.preview-dots span {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
}

.preview-content {
    display: flex;
    height: 400px;
}

.preview-sidebar {
    width: 80px;
    background: var(--gray-100);
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.sidebar-item {
    height: 40px;
    background: var(--gray-300);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.sidebar-item.active {
    background: linear-gradient(135deg, var(--primary-600), var(--secondary-600));
}

.preview-main {
    flex: 1;
    padding: var(--spacing-lg);
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

.preview-card {
    background: var(--gray-100);
    border-radius: var(--radius-lg);
    animation: pulse 2s infinite ease-in-out;
}

.preview-card.card-1 {
    grid-column: 1 / -1;
    height: 120px;
}

.preview-card.card-2 {
    height: 200px;
}

.preview-card.card-3 {
    height: 200px;
    animation-delay: 0.5s;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.6;
    }
}

/* Features Section */
.features {
    padding: var(--spacing-3xl) 0;
    background: white;
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto var(--spacing-3xl);
}

.section-title {
    font-size: var(--font-size-4xl);
    font-weight: 800;
    color: var(--gray-900);
    margin-bottom: var(--spacing-md);
}

.section-description {
    font-size: var(--font-size-lg);
    color: var(--gray-600);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-xl);
}

.feature-card {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    border: 1px solid var(--gray-200);
    transition: all var(--transition-base);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-600);
}

.feature-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-lg);
}

.feature-icon svg {
    width: 28px;
    height: 28px;
    color: white;
    stroke-width: 2;
}

.feature-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--spacing-sm);
}

.feature-description {
    color: var(--gray-600);
    line-height: 1.6;
}

/* Demo Section */
.demo-section {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(135deg, var(--primary-600), var(--secondary-600));
}

.demo-section .section-title,
.demo-section .section-description {
    color: white;
}

.demo-container {
    text-align: center;
    margin-top: var(--spacing-2xl);
}

#openDashboardBtn {
    background: white;
    color: var(--primary-600);
    font-size: var(--font-size-lg);
    padding: 1rem 2rem;
}

#openDashboardBtn:hover {
    transform: scale(1.05);
}

/* Pricing Section */
.pricing {
    padding: var(--spacing-3xl) 0;
    background: var(--gray-50);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    max-width: 1100px;
    margin: 0 auto;
}

.pricing-card {
    background: white;
    border-radius: var(--radius-2xl);
    padding: var(--spacing-2xl);
    border: 2px solid var(--gray-200);
    transition: all var(--transition-base);
    position: relative;
}

.pricing-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.pricing-card.featured {
    border-color: var(--primary-600);
    box-shadow: var(--shadow-lg);
}

.pricing-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, var(--primary-600), var(--secondary-600));
    color: white;
    padding: 0.375rem 1rem;
    border-radius: 999px;
    font-size: var(--font-size-xs);
    font-weight: 600;
}

.pricing-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-xl);
    border-bottom: 1px solid var(--gray-200);
}

.pricing-name {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--spacing-md);
}

.pricing-price {
    display: flex;
    align-items: baseline;
    justify-content: center;
    margin-bottom: var(--spacing-sm);
}

.currency {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--gray-600);
}

.amount {
    font-size: var(--font-size-4xl);
    font-weight: 800;
    color: var(--gray-900);
}

.period {
    font-size: var(--font-size-sm);
    color: var(--gray-600);
    margin-left: var(--spacing-xs);
}

.pricing-description {
    color: var(--gray-600);
}

.pricing-features {
    list-style: none;
    margin-bottom: var(--spacing-xl);
}

.pricing-features li {
    padding: var(--spacing-sm) 0;
    color: var(--gray-700);
    position: relative;
    padding-left: var(--spacing-lg);
}

.pricing-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success);
    font-weight: 700;
}

.pricing-card .btn {
    width: 100%;
    justify-content: center;
}

/* Footer */
.footer {
    background: var(--gray-900);
    color: var(--gray-400);
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 3fr;
    gap: var(--spacing-3xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-brand .brand-name {
    color: white;
}

.footer-description {
    margin-top: var(--spacing-md);
    line-height: 1.6;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
}

.footer-column h4 {
    color: white;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.footer-column a {
    display: block;
    color: var(--gray-400);
    text-decoration: none;
    margin-bottom: var(--spacing-sm);
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--gray-800);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero-container {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }

    .hero-visual {
        max-width: 500px;
        margin: 0 auto;
    }

    .hero-title {
        font-size: var(--font-size-4xl);
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .hero-title {
        font-size: var(--font-size-3xl);
    }

    .hero-cta {
        flex-direction: column;
    }

    .hero-stats {
        flex-direction: column;
        gap: var(--spacing-md);
    }

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

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

    .footer-content {
        grid-template-columns: 1fr;
    }

    .footer-links {
        grid-template-columns: 1fr;
    }

    .preview-content {
        height: 300px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: var(--font-size-2xl);
    }

    .section-title {
        font-size: var(--font-size-3xl);
    }
}