/* ============================================
   CSS Variables & Reset
   ============================================ */

:root {
    --primary-color: #1DA1F2;
    --primary-dark: #0d8bd9;
    --primary-light: #4fc3f7;
    --secondary-color: #14171A;
    --text-primary: #14171A;
    --text-secondary: #657786;
    --text-light: #AAB8C2;
    --bg-primary: #FFFFFF;
    --bg-secondary: #F5F8FA;
    --bg-dark: #14171A;
    --border-color: #E1E8ED;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.15);
    --gradient-primary: linear-gradient(135deg, #1DA1F2 0%, #0d8bd9 100%);
    --gradient-hero: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #1DA1F2 100%);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
}

* {
    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, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ============================================
   Navigation
   ============================================ */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: var(--transition);
}

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

.nav-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 0;
}

.logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: -0.5px;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 32px;
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    font-size: 15px;
    transition: var(--transition);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition);
}

.nav-links a:hover {
    color: var(--primary-color);
}

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

.nav-cta {
    padding: 10px 20px;
    font-size: 14px;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition);
}

/* ============================================
   Buttons
   ============================================ */

.btn-primary,
.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 16px;
    text-decoration: none;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    white-space: nowrap;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-md);
}

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

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

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

.btn-large {
    padding: 16px 32px;
    font-size: 18px;
}

/* ============================================
   Hero Section
   ============================================ */

.hero {
    position: relative;
    padding: 140px 0 100px;
    overflow: hidden;
    background: linear-gradient(180deg, #FFFFFF 0%, #F5F8FA 100%);
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-hero);
    opacity: 0.03;
    z-index: 0;
}

.hero-content {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-text {
    animation: fadeInUp 0.8s ease-out;
}

.hero-title {
    font-size: 64px;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 20px;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -2px;
}

.hero-subtitle {
    font-size: 28px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
    line-height: 1.3;
}

.hero-description {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 32px;
    line-height: 1.7;
}

.hero-badges {
    display: flex;
    gap: 16px;
    margin-top: 24px;
    flex-wrap: wrap;
}

.badge {
    display: inline-flex;
    align-items: center;
    padding: 8px 16px;
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
}

.hero-image {
    animation: fadeInRight 0.8s ease-out;
}

.hero-preview {
    position: relative;
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    background: white;
    padding: 20px;
}

.hero-preview img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
    display: block;
}

/* ============================================
   Section Styles
   ============================================ */

section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary);
    letter-spacing: -1px;
}

.section-subtitle {
    font-size: 20px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ============================================
   Features Section
   ============================================ */

.features {
    background: var(--bg-primary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 32px;
}

.feature-card {
    background: white;
    padding: 40px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

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

.feature-icon {
    font-size: 48px;
    margin-bottom: 20px;
    display: block;
}

.feature-title {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.feature-description {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ============================================
   How to Use Section
   ============================================ */

.how-to-use {
    background: var(--bg-secondary);
}

.how-to-use-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: start;
    max-width: 1200px;
    margin: 0 auto;
}

.steps-container {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.step-item {
    display: grid;
    grid-template-columns: 60px 1fr;
    gap: 20px;
    align-items: start;
    background: white;
    padding: 24px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.step-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateX(4px);
}

.step-number {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--gradient-primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: 700;
    flex-shrink: 0;
}

.step-content {
    display: flex;
    flex-direction: column;
}

.step-text {
    flex: 1;
}

.step-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.step-description {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.how-to-use-demo {
    position: sticky;
    top: 100px;
}

.demo-image-wrapper {
    background: white;
    border-radius: var(--radius-lg);
    padding: 20px;
    box-shadow: var(--shadow-lg);
    position: relative;
}

.demo-image {
    width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    display: block;
    box-shadow: var(--shadow-md);
}

/* ============================================
   Gallery Section
   ============================================ */

.gallery {
    background: var(--bg-primary);
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    max-width: 1200px;
    margin: 0 auto;
}

.gallery-item {
    background: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    position: relative;
    cursor: pointer;
}

.gallery-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.gallery-item::after {
    content: '🔍 Click to view';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0);
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 8px 16px;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    pointer-events: none;
    z-index: 10;
    transition: var(--transition);
    white-space: nowrap;
}

.gallery-item:hover::after {
    transform: translate(-50%, -50%) scale(1);
}

.gallery-image-wrapper {
    position: relative;
    width: 100%;
    padding-top: 60%; /* Slightly taller aspect ratio for card preview */
    background: linear-gradient(135deg, #f5f7fa 0%, #e8ecf1 100%);
    overflow: hidden;
}

.gallery-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: contain;
    object-position: center;
    display: block;
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.gallery-item:hover .gallery-image {
    transform: scale(1.1);
}

.gallery-content {
    padding: 20px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.gallery-item-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
    line-height: 1.3;
}

.gallery-item-description {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.5;
    flex: 1;
}

/* Gallery Modal (Lightbox) */
.gallery-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 9999;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 20px;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.gallery-modal.active {
    display: flex;
    opacity: 1;
}

.gallery-modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(4px);
}

.gallery-modal-content {
    position: relative;
    z-index: 1;
    max-width: 90vw;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    animation: modalFadeIn 0.3s ease;
}

@keyframes modalFadeIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.gallery-modal-close {
    position: absolute;
    top: -50px;
    right: 0;
    background: rgba(255, 255, 255, 0.2);
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: white;
    transition: var(--transition);
    z-index: 10;
}

.gallery-modal-close:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: rotate(90deg);
}

.gallery-modal-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.2);
    border: none;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: white;
    transition: var(--transition);
    z-index: 10;
}

.gallery-modal-nav:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-50%) scale(1.1);
}

.gallery-modal-prev {
    left: -70px;
}

.gallery-modal-next {
    right: -70px;
}

@media (max-width: 1024px) {
    .gallery-modal-prev {
        left: 20px;
    }
    
    .gallery-modal-next {
        right: 20px;
    }
}

.gallery-modal-image {
    max-width: 100%;
    max-height: 80vh;
    object-fit: contain;
    border-radius: var(--radius-md);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    background: white;
    padding: 4px;
}

.gallery-modal-info {
    margin-top: 24px;
    text-align: center;
    color: white;
    max-width: 600px;
}

.gallery-modal-title {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 8px;
    color: white;
}

.gallery-modal-description {
    font-size: 16px;
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.6;
}

/* ============================================
   FAQ Section
   ============================================ */

.faq {
    background: var(--bg-secondary);
    position: relative;
    overflow: hidden;
}

.faq-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.faq-item {
    background: white;
    border-radius: var(--radius-lg);
    padding: 28px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    transition: var(--transition);
    cursor: pointer;
    position: relative;
    overflow: hidden;
    animation: float 6s ease-in-out infinite;
}

.faq-item:nth-child(1) {
    animation-delay: 0s;
}

.faq-item:nth-child(2) {
    animation-delay: 0.5s;
}

.faq-item:nth-child(3) {
    animation-delay: 1s;
}

.faq-item:nth-child(4) {
    animation-delay: 1.5s;
}

.faq-item:nth-child(5) {
    animation-delay: 2s;
}

.faq-item:nth-child(6) {
    animation-delay: 2.5s;
}

.faq-item:nth-child(7) {
    animation-delay: 3s;
}

.faq-item:nth-child(8) {
    animation-delay: 3.5s;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-10px);
    }
}

.faq-item:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

.faq-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s ease;
}

.faq-item.active::before {
    transform: scaleX(1);
}

.faq-question {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 16px;
    transition: var(--transition);
}

.faq-item:hover .faq-question {
    color: var(--primary-color);
}

.faq-question::after {
    content: '+';
    font-size: 28px;
    font-weight: 300;
    color: var(--primary-color);
    transition: var(--transition);
    flex-shrink: 0;
    line-height: 1;
}

.faq-item.active .faq-question::after {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.faq-item.active .faq-answer {
    max-height: 500px;
}

.faq-answer-content {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.7;
    padding-top: 8px;
}

/* ============================================
   Download CTA Section
   ============================================ */

.download-cta {
    background: var(--gradient-primary);
    color: white;
    text-align: center;
    padding: 100px 0;
}

.cta-content {
    max-width: 700px;
    margin: 0 auto;
}

.cta-title {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 16px;
    color: white;
}

.cta-subtitle {
    font-size: 20px;
    margin-bottom: 40px;
    opacity: 0.95;
}

.cta-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

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

.download-cta .btn-primary:hover {
    background: var(--bg-secondary);
}

.download-cta .btn-secondary {
    border-color: white;
    color: white;
}

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

/* ============================================
   Footer
   ============================================ */

.footer {
    background: var(--bg-dark);
    color: white;
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-logo {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--primary-color);
}

.footer-description {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.6;
}

.footer-heading {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 16px;
    color: white;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: 14px;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--primary-color);
}

.social-links {
    display: flex;
    gap: 16px;
}

.social-link {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    text-decoration: none;
    transition: var(--transition);
}

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

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.footer-copyright {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
}

.footer-legal {
    display: flex;
    gap: 12px;
    align-items: center;
    font-size: 14px;
}

.footer-legal a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: var(--transition);
}

.footer-legal a:hover {
    color: var(--primary-color);
}

.footer-legal span {
    color: rgba(255, 255, 255, 0.3);
}

/* ============================================
   Animations
   ============================================ */

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* ============================================
   Responsive Design
   ============================================ */

@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .hero-image {
        order: -1;
    }
    
    .how-to-use-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .how-to-use-demo {
        position: relative;
        top: 0;
        order: -1;
    }
    
    .step-item {
        grid-template-columns: 50px 1fr;
        gap: 16px;
        padding: 20px;
    }
    
    .step-number {
        width: 50px;
        height: 50px;
        font-size: 20px;
    }
    
    .step-image {
        width: 100%;
        height: 200px;
    }
}

@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 24px;
        box-shadow: var(--shadow-lg);
        transform: translateX(-100%);
        transition: var(--transition);
        gap: 20px;
    }
    
    .nav-links.active {
        transform: translateX(0);
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .nav-cta {
        display: none;
    }
    
    .hero {
        padding: 120px 0 60px;
    }
    
    .hero-title {
        font-size: 42px;
    }
    
    .hero-subtitle {
        font-size: 22px;
    }
    
    .section-title {
        font-size: 36px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .step-item {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .step-number {
        width: 60px;
        height: 60px;
        font-size: 24px;
    }
    
    .gallery-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }
    
    @media (max-width: 640px) {
        .gallery-grid {
            grid-template-columns: 1fr;
        }
    }
    
    .faq-container {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .faq-item {
        padding: 24px;
    }
    
    .cta-title {
        font-size: 36px;
    }
    
    .cta-buttons {
        flex-direction: column;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    .hero-title {
        font-size: 32px;
    }
    
    .hero-subtitle {
        font-size: 18px;
    }
    
    .hero-description {
        font-size: 16px;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .feature-card,
    .step-item {
        padding: 24px;
    }
}