:root {
    --primary: #1A2B4C;
    --secondary: #0066FF;
    --accent: #00B67A;
    --light: #F5F9FF;
    --dark: #0A2540;
    --gray: #E5E9F0;
    --text: #344054;
    --white: #FFFFFF;
    --error: #DC2626;
    --success: #059669;
    --warning: #D97706;
    
    /* 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), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Transitions */
    --transition-fast: 0.15s ease-in-out;
    --transition-normal: 0.3s ease-in-out;
    --transition-slow: 0.5s ease-in-out;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    color: var(--text);
    background-color: var(--white);
    line-height: 1.6;
    font-size: 16px;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    color: var(--dark);
    font-weight: 600;
    line-height: 1.3;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

/* Layout */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    background-color: var(--white);
    box-shadow: var(--shadow-sm);
    padding: 20px 0;
    position: fixed;
    width: 100%;
    z-index: 1000;
    top: 0;
    transition: var(--transition-normal);
}

header.scrolled {
    box-shadow: var(--shadow-md);
    backdrop-filter: blur(10px);
    background-color: rgba(255, 255, 255, 0.95);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
}

.logo span {
    color: var(--secondary);
}

nav ul {
    display: flex;
    list-style: none;
    gap: 2rem;
}

nav ul li a {
    text-decoration: none;
    color: var(--text);
    font-weight: 500;
    transition: var(--transition-normal);
    position: relative;
}

nav ul li a:hover {
    color: var(--secondary);
}

nav ul li a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -5px;
    left: 50%;
    background-color: var(--secondary);
    transition: var(--transition-normal);
    transform: translateX(-50%);
}

nav ul li a:hover::after {
    width: 100%;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--primary);
    transition: var(--transition-normal);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 500;
    font-size: 1rem;
    transition: var(--transition-normal);
    cursor: pointer;
    border: none;
    text-align: center;
}

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

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

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* Hero Section */
.hero {
    padding: 160px 0 100px;
    background: linear-gradient(135deg, var(--light) 0%, var(--white) 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(ellipse at center top, rgba(0, 102, 255, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 4rem;
    position: relative;
    z-index: 1;
}

.hero-text {
    flex: 1;
    max-width: 500px;
}

.hero-text h1 {
    font-size: 3rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.hero-text p {
    font-size: 1.125rem;
    margin-bottom: 2rem;
    color: var(--text);
    line-height: 1.6;
}

.hero-image {
    flex: 1;
    max-width: 500px;
}

.dashboard-mockup {
    background: var(--white);
    border-radius: 12px;
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    transform: perspective(1000px) rotateY(-15deg) rotateX(5deg);
    transition: var(--transition-slow);
}

.dashboard-mockup:hover {
    transform: perspective(1000px) rotateY(-10deg) rotateX(2deg);
}

.mockup-header {
    background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%);
    padding: 12px 20px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.mockup-controls {
    display: flex;
    gap: 6px;
}

.control {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.control.red { background-color: #FF5F57; }
.control.yellow { background-color: #FFBD2E; }
.control.green { background-color: #28CA42; }

.mockup-title {
    color: var(--white);
    font-weight: 600;
    font-size: 0.875rem;
}

.mockup-content {
    padding: 2rem;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

.stat-card {
    background: linear-gradient(135deg, var(--light) 0%, var(--white) 100%);
    padding: 1.5rem 1rem;
    border-radius: 8px;
    text-align: center;
    border: 1px solid var(--gray);
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--secondary);
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text);
    font-weight: 500;
}

/* Features Section */
.features {
    padding: 100px 0;
    background-color: var(--white);
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-header h2 {
    font-size: 2.25rem;
    color: var(--dark);
    margin-bottom: 1rem;
}

.section-header p {
    font-size: 1.125rem;
    max-width: 600px;
    margin: 0 auto;
    color: var(--text);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.feature-card {
    background-color: var(--light);
    padding: 2rem;
    border-radius: 12px;
    transition: var(--transition-normal);
    border: 1px solid transparent;
}

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

.feature-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--secondary) 0%, var(--primary) 100%);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    color: var(--white);
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--dark);
}

.feature-card p {
    color: var(--text);
    line-height: 1.6;
}

/* How It Works Section */
.how-it-works {
    padding: 100px 0;
    background-color: var(--light);
}

.steps {
    display: flex;
    justify-content: space-between;
    margin-top: 4rem;
    gap: 2rem;
}

.step {
    flex: 1;
    text-align: center;
    position: relative;
}

.step:not(:last-child)::after {
    content: '';
    position: absolute;
    top: 30px;
    right: -1rem;
    width: 2rem;
    height: 2px;
    background: linear-gradient(90deg, var(--secondary) 0%, var(--primary) 100%);
    z-index: 1;
}

.step-number {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 auto 1.5rem;
    position: relative;
    z-index: 2;
}

.step h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--dark);
}

.step p {
    color: var(--text);
    line-height: 1.6;
}

/* Demo Section */
.demo {
    padding: 100px 0;
    background-color: var(--white);
}

.demo-content {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 4rem;
}

.demo-text {
    flex: 1;
    max-width: 500px;
}

.demo-text h2 {
    font-size: 2.25rem;
    color: var(--dark);
    margin-bottom: 1.5rem;
}

.demo-text p {
    font-size: 1.125rem;
    margin-bottom: 2rem;
    color: var(--text);
}

.demo-benefits {
    list-style: none;
    margin-bottom: 2rem;
}

.demo-benefits li {
    padding: 0.5rem 0;
    color: var(--text);
    font-weight: 500;
}

.demo-benefits li::before {
    content: '✓';
    color: var(--accent);
    font-weight: bold;
    margin-right: 0.5rem;
}

.demo-form {
    flex: 1;
    max-width: 500px;
    background-color: var(--light);
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
}

.demo-form h3 {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    color: var(--dark);
    text-align: center;
}

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

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

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--gray);
    border-radius: 6px;
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition-normal);
    background-color: var(--white);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--secondary);
    box-shadow: 0 0 0 3px rgba(0, 102, 255, 0.1);
}

.form-group input.error,
.form-group select.error,
.form-group textarea.error {
    border-color: var(--error);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.error-message {
    display: block;
    color: var(--error);
    font-size: 0.875rem;
    margin-top: 0.5rem;
    opacity: 0;
    transition: var(--transition-normal);
}

.error-message.show {
    opacity: 1;
}

.form-status {
    margin-top: 1rem;
    padding: 1rem;
    border-radius: 6px;
    font-weight: 500;
    text-align: center;
    opacity: 0;
    transition: var(--transition-normal);
}

.form-status.show {
    opacity: 1;
}

.form-status.success {
    background-color: rgba(5, 150, 105, 0.1);
    color: var(--success);
    border: 1px solid var(--success);
}

.form-status.error {
    background-color: rgba(220, 38, 38, 0.1);
    color: var(--error);
    border: 1px solid var(--error);
}

/* Footer */
footer {
    background-color: var(--dark);
    color: var(--light);
    padding: 4rem 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-column h3 {
    font-size: 1.125rem;
    margin-bottom: 1.5rem;
    color: var(--white);
}

.footer-column p {
    color: var(--light);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

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

.footer-column ul li {
    margin-bottom: 0.75rem;
}

.footer-column ul li a {
    color: var(--light);
    text-decoration: none;
    transition: var(--transition-normal);
}

.footer-column ul li a:hover {
    color: var(--secondary);
}

.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.social-links a {
    color: var(--light);
    transition: var(--transition-normal);
    padding: 0.5rem;
    border-radius: 6px;
}

.social-links a:hover {
    color: var(--secondary);
    background-color: rgba(255, 255, 255, 0.1);
}

.copyright {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--light);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero-text h1 {
        font-size: 2.5rem;
    }
    
    .feature-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .dashboard-mockup {
        transform: none;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 1rem;
    }
    
    /* Mobile Navigation */
    nav ul {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--white);
        box-shadow: var(--shadow-md);
        flex-direction: column;
        padding: 1rem;
        gap: 1rem;
    }
    
    nav ul.active {
        display: flex;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .mobile-menu-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(6px, 6px);
    }
    
    .mobile-menu-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .mobile-menu-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(6px, -6px);
    }
    
    /* Hero Section */
    .hero {
        padding: 120px 0 60px;
    }
    
    .hero-content {
        flex-direction: column;
        text-align: center;
        gap: 2rem;
    }
    
    .hero-text h1 {
        font-size: 2rem;
    }
    
    .hero-text,
    .hero-image {
        max-width: 100%;
    }
    
    /* Features */
    .feature-grid {
        grid-template-columns: 1fr;
    }
    
    /* Steps */
    .steps {
        flex-direction: column;
        gap: 3rem;
    }
    
    .step:not(:last-child)::after {
        display: none;
    }
    
    /* Demo */
    .demo-content {
        flex-direction: column;
        gap: 2rem;
    }
    
    .demo-text,
    .demo-form {
        max-width: 100%;
    }
    
    /* Footer */
    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    /* Stats Grid */
    .stats-grid {
        grid-template-columns: 1fr;
        gap: 0.75rem;
    }
    
    .stat-card {
        padding: 1rem;
    }
}

@media (max-width: 480px) {
    .hero-text h1 {
        font-size: 1.75rem;
    }
    
    .section-header h2 {
        font-size: 1.75rem;
    }
    
    .demo-form {
        padding: 1.5rem;
    }
    
    .btn {
        width: 100%;
    }
}

/* Animation for loading states */
.loading {
    position: relative;
    overflow: hidden;
}

.loading::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    animation: loading 1.5s infinite;
}

@keyframes loading {
    0% { left: -100%; }
    100% { left: 100%; }
}

/* Accessibility improvements */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --primary: #000000;
        --secondary: #0000FF;
        --text: #000000;
        --light: #FFFFFF;
    }
}

/* Focus indicators for keyboard navigation */
*:focus {
    outline: 2px solid var(--secondary);
    outline-offset: 2px;
}

button:focus,
.btn:focus {
    outline: 2px solid var(--white);
    outline-offset: 2px;
}