/* Modern CSS Reset and Variables */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    /* Color System */
    --color-primary: #0066FF;
    --color-primary-dark: #0052CC;
    --color-primary-light: #E6F0FF;
    --color-accent: #FF6B6B;
    --color-success: #00D9A3;
    --color-warning: #FFB800;
    --color-text: #1A1A1A;
    --color-text-light: #666666;
    --color-text-lighter: #999999;
    --color-background: #FFFFFF;
    --color-background-alt: #F8F9FB;
    --color-background-dark: #0A0A0A;
    --color-border: #E5E7EB;
    --color-border-light: #F3F4F6;
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-extrabold: 800;
    
    /* Spacing Scale */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;
    
    /* Layout */
    --container-max: 1200px;
    --navbar-height: 72px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 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);
    
    /* Borders */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
}

/* Base Styles */
html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-weight: var(--font-weight-regular);
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-weight-bold);
    line-height: 1.2;
    letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
h4 { font-size: clamp(1.25rem, 2vw, 1.5rem); }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
    color: var(--color-text-light);
    line-height: 1.7;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color var(--transition-fast);
}

/* Container */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--navbar-height);
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    z-index: 1000;
    transition: all var(--transition-base);
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-md);
}

.nav-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-weight: var(--font-weight-bold);
    font-size: 1.5rem;
}

.logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--color-primary);
    color: white;
    border-radius: var(--radius-md);
    font-size: 1.25rem;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--space-2xl);
}

.nav-link {
    font-weight: var(--font-weight-medium);
    color: var(--color-text-light);
    position: relative;
    padding: var(--space-xs) 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: width var(--transition-base);
}

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

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-sm);
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: all var(--transition-base);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: calc(var(--navbar-height) + var(--space-4xl)) 0 var(--space-4xl);
    position: relative;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    inset: 0;
    z-index: -1;
}

.hero-gradient {
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at top right, rgba(0, 102, 255, 0.1) 0%, transparent 50%),
                radial-gradient(ellipse at bottom left, rgba(255, 107, 107, 0.1) 0%, transparent 50%);
}

.hero-pattern {
    position: absolute;
    inset: 0;
    background-image: 
        radial-gradient(circle at 1px 1px, rgba(0, 102, 255, 0.03) 1px, transparent 1px);
    background-size: 40px 40px;
}

.hero-content {
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.hero-title {
    margin-bottom: var(--space-xl);
    font-weight: var(--font-weight-extrabold);
}

.text-accent {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 1.25rem;
    max-width: 700px;
    margin: 0 auto var(--space-2xl);
}

.hero-actions {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--space-3xl);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-xl);
    font-weight: var(--font-weight-semibold);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    cursor: pointer;
    border: none;
    text-decoration: none;
    white-space: nowrap;
}

.btn-large {
    padding: var(--space-lg) var(--space-2xl);
    font-size: 1.125rem;
}

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

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

.btn-secondary {
    background: var(--color-background);
    color: var(--color-text);
    border: 2px solid var(--color-border);
}

.btn-secondary:hover {
    background: var(--color-background-alt);
    border-color: var(--color-text);
}

/* Stats */
.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--space-3xl);
    flex-wrap: wrap;
}

.stat {
    text-align: center;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.6s forwards;
}

.stat:nth-child(1) { animation-delay: 0.1s; }
.stat:nth-child(2) { animation-delay: 0.2s; }
.stat:nth-child(3) { animation-delay: 0.3s; }

.stat-number {
    font-size: 2.5rem;
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
}

.stat-label {
    color: var(--color-text-light);
    font-weight: var(--font-weight-medium);
}

/* Sections */
section {
    padding: var(--space-4xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-3xl);
}

.section-label {
    display: inline-block;
    padding: var(--space-xs) var(--space-md);
    background: var(--color-primary-light);
    color: var(--color-primary);
    border-radius: var(--radius-full);
    font-weight: var(--font-weight-semibold);
    font-size: 0.875rem;
    margin-bottom: var(--space-md);
}

.section-title {
    margin-bottom: var(--space-lg);
}

.section-description {
    max-width: 700px;
    margin: 0 auto;
    font-size: 1.125rem;
}

/* Services */
.services {
    background: var(--color-background-alt);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-xl);
}

.service-card {
    background: var(--color-background);
    padding: var(--space-2xl);
    border-radius: var(--radius-xl);
    transition: all var(--transition-base);
    border: 1px solid var(--color-border-light);
}

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

.service-icon {
    width: 64px;
    height: 64px;
    background: var(--color-primary-light);
    color: var(--color-primary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-lg);
}

.service-card h3 {
    margin-bottom: var(--space-md);
}

.service-link {
    display: inline-flex;
    align-items: center;
    color: var(--color-primary);
    font-weight: var(--font-weight-semibold);
    margin-top: var(--space-lg);
}

.service-link:hover {
    gap: var(--space-sm);
}

/* Demo Section */
.demo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--space-2xl);
}

.demo-item {
    background: var(--color-background);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

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

.browser-mockup {
    background: var(--color-background-alt);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    overflow: hidden;
}

.browser-header {
    background: white;
    padding: var(--space-md) var(--space-lg);
    display: flex;
    align-items: center;
    gap: var(--space-md);
    border-bottom: 1px solid var(--color-border-light);
}

.browser-dots {
    display: flex;
    gap: var(--space-sm);
}

.browser-dots span {
    width: 12px;
    height: 12px;
    border-radius: var(--radius-full);
    background: var(--color-border);
}

.browser-dots span:nth-child(1) { background: #FF5F57; }
.browser-dots span:nth-child(2) { background: #FFBD2E; }
.browser-dots span:nth-child(3) { background: #28CA42; }

.browser-url {
    flex: 1;
    font-size: 0.875rem;
    color: var(--color-text-light);
    background: var(--color-background-alt);
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-sm);
}

.browser-content {
    background: white;
    padding: var(--space-xl);
    min-height: 300px;
}

/* Skeleton Loader */
.skeleton-loader {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.skeleton {
    background: linear-gradient(90deg, 
        var(--color-border-light) 0%, 
        #f0f0f0 50%, 
        var(--color-border-light) 100%);
    background-size: 200% 100%;
    animation: skeleton-pulse 1.5s ease-in-out infinite;
    border-radius: var(--radius-sm);
}

@keyframes skeleton-pulse {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

.skeleton-nav {
    height: 48px;
    width: 100%;
}

.skeleton-hero {
    height: 200px;
    width: 100%;
}

.skeleton-banner {
    height: 150px;
    width: 100%;
}

.skeleton-content {
    height: 20px;
    width: 100%;
}

.skeleton-content:last-child {
    width: 70%;
}

.skeleton-row {
    display: flex;
    gap: var(--space-md);
    margin-top: var(--space-lg);
}

.skeleton-card {
    flex: 1;
    height: 100px;
}

.skeleton-grid {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: var(--space-lg);
}

.skeleton-sidebar {
    height: 200px;
}

.skeleton-main {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.skeleton-calendar {
    height: 150px;
    width: 100%;
}

/* Demo Info */
.demo-info {
    padding: var(--space-xl);
}

.demo-info h3 {
    margin-bottom: var(--space-sm);
}

.demo-info p {
    margin-bottom: var(--space-lg);
}

.demo-tags {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.tag {
    padding: var(--space-xs) var(--space-md);
    background: var(--color-background-alt);
    color: var(--color-text-light);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: var(--font-weight-medium);
}

/* About Section */
.about {
    background: var(--color-background-alt);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4xl);
    align-items: center;
}

.about-content h2 {
    margin-bottom: var(--space-xl);
}

.about-features {
    margin-top: var(--space-2xl);
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.about-feature {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    color: var(--color-text);
    font-weight: var(--font-weight-medium);
}

.about-feature svg {
    color: var(--color-success);
    flex-shrink: 0;
}

.about-image {
    position: relative;
}

.image-placeholder {
    width: 100%;
    height: 500px;
    background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-border-light) 100%);
    border-radius: var(--radius-xl);
    position: relative;
    overflow: hidden;
}

.image-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.1);
}

.image-overlay span {
    font-size: 3rem;
    font-weight: var(--font-weight-bold);
    color: white;
    opacity: 0.5;
}

.about-stats {
    position: absolute;
    bottom: -20px;
    right: -20px;
}

.stat-card {
    background: white;
    padding: var(--space-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    text-align: center;
}

.stat-value {
    font-size: 2.5rem;
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
}

/* Contact Section */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--space-4xl);
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: var(--space-2xl);
}

.contact-item {
    display: flex;
    gap: var(--space-lg);
}

.contact-icon {
    width: 48px;
    height: 48px;
    background: var(--color-primary-light);
    color: var(--color-primary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact-item h4 {
    margin-bottom: var(--space-xs);
    font-size: 1rem;
}

.contact-item a {
    color: var(--color-primary);
    font-weight: var(--font-weight-medium);
}

.contact-item a:hover {
    text-decoration: underline;
}

/* Form */
.contact-form {
    background: var(--color-background-alt);
    padding: var(--space-2xl);
    border-radius: var(--radius-xl);
}

.form-group {
    margin-bottom: var(--space-lg);
}

.form-group label {
    display: block;
    margin-bottom: var(--space-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: var(--space-md) var(--space-lg);
    background: white;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 1rem;
    transition: all var(--transition-base);
}

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

/* Footer */
.footer {
    background: var(--color-background-dark);
    color: white;
    padding: var(--space-4xl) 0 var(--space-2xl);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--space-4xl);
    margin-bottom: var(--space-3xl);
}

.footer-logo {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    font-weight: var(--font-weight-bold);
    font-size: 1.5rem;
    margin-bottom: var(--space-lg);
}

.footer-logo .logo-icon {
    background: white;
    color: var(--color-background-dark);
}

.footer-brand p {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: var(--space-xl);
}

.social-links {
    display: flex;
    gap: var(--space-md);
}

.social-links a {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
}

.social-links a:hover {
    background: var(--color-primary);
    transform: translateY(-2px);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-2xl);
}

.footer-column h4 {
    margin-bottom: var(--space-lg);
    font-size: 1rem;
    font-weight: var(--font-weight-semibold);
}

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

.footer-column li {
    margin-bottom: var(--space-sm);
}

.footer-column a {
    color: rgba(255, 255, 255, 0.7);
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    padding-top: var(--space-2xl);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-lg);
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.7);
}

.footer-legal {
    display: flex;
    gap: var(--space-xl);
}

.footer-legal a {
    color: rgba(255, 255, 255, 0.7);
    transition: color var(--transition-fast);
}

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

/* Animations */
@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-in {
    animation: fadeInUp 0.6s ease-out forwards;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .about-grid,
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .about-stats {
        position: static;
        margin-top: var(--space-2xl);
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    :root {
        --navbar-height: 64px;
    }
    
    .nav-menu {
        position: fixed;
        top: var(--navbar-height);
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: var(--space-xl);
        gap: var(--space-lg);
        box-shadow: var(--shadow-xl);
        transform: translateY(-120%);
        opacity: 0;
        transition: all var(--transition-base);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }
    
    .hero {
        padding: calc(var(--navbar-height) + var(--space-2xl)) 0 var(--space-2xl);
    }
    
    .hero-title {
        font-size: clamp(2rem, 6vw, 3rem);
    }
    
    .hero-description {
        font-size: 1.125rem;
    }
    
    .hero-stats {
        gap: var(--space-xl);
    }
    
    .stat-number {
        font-size: 2rem;
    }
    
    .services-grid,
    .demo-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--space-md);
    }
    
    .hero-actions {
        flex-direction: column;
        width: 100%;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .browser-mockup {
        border-radius: 0;
    }
    
    .demo-item {
        border-radius: var(--radius-lg);
    }
}