:root {
    --primary-color: #0078D4; /* Windows blue */
    --primary-hover: #005a9e;
    --primary-light: #e5f1fb;
    --secondary-color: #ffffff;
    --bg-color: #f8fafc;
    --bg-secondary: #ffffff;
    --text-color: #1e293b;
    --text-muted: #64748b;
    --card-bg: #ffffff;
    --border-color: #e2e8f0;
    --nav-bg: rgba(255, 255, 255, 0.95);
    
    --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);
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #0f172a;
        --bg-secondary: #1e293b;
        --text-color: #f1f5f9;
        --text-muted: #94a3b8;
        --card-bg: #1e293b;
        --border-color: #334155;
        --nav-bg: rgba(15, 23, 42, 0.95);
        --primary-light: rgba(0, 120, 212, 0.2);
    }
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    font-family: 'Hind Siliguri', 'Inter', sans-serif;
    overflow-x: hidden;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

.relative { position: relative; }
.z-10 { z-index: 10; }

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: var(--nav-bg);
    backdrop-filter: blur(12px);
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 76px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-color);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 12px;
    font-family: 'Inter', sans-serif;
}

.site-logo {
    height: 38px;
    width: auto;
    object-fit: contain;
}

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

.nav-links a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    font-size: 1.05rem;
    transition: color 0.2s;
}

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

/* Buttons */
.btn-primary, .btn-secondary, .btn-primary-outline {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 12px 24px;
    border-radius: 8px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    font-family: 'Inter', sans-serif;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
    border: none;
    box-shadow: 0 4px 14px 0 rgba(0, 120, 212, 0.39);
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 120, 212, 0.23);
    color: white;
}

.btn-large {
    padding: 16px 32px;
    font-size: 1.1rem;
}

.btn-primary-outline {
    border: 2px solid var(--primary-color);
    color: var(--primary-color) !important;
    padding: 8px 20px;
    border-radius: 20px;
}

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

/* Hero Section */
.hero {
    position: relative;
    padding: 180px 0 100px;
    text-align: center;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: -50%;
    left: 50%;
    transform: translateX(-50%);
    width: 100vw;
    height: 100vw;
    background: radial-gradient(circle, rgba(0, 120, 212, 0.1) 0%, rgba(255, 255, 255, 0) 70%);
    z-index: 0;
    pointer-events: none;
}
@media (prefers-color-scheme: dark) {
    .hero-bg {
        background: radial-gradient(circle, rgba(0, 120, 212, 0.15) 0%, rgba(15, 23, 42, 0) 70%);
    }
}

.badges {
    margin-bottom: 30px;
    display: flex;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
}

.badge {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 8px 16px;
    border-radius: 30px;
    font-size: 0.9rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-color);
    box-shadow: var(--shadow-sm);
    font-family: 'Inter', sans-serif;
}

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

.hero h1 {
    font-size: 3.8rem;
    line-height: 1.2;
    margin-bottom: 24px;
    font-weight: 800;
}

.highlight {
    background: linear-gradient(135deg, #0078D4 0%, #00d2ff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
}

.hero p {
    font-size: 1.35rem;
    color: var(--text-muted);
    max-width: 850px;
    margin: 0 auto 20px;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-color) !important;
    font-weight: 600;
    margin-bottom: 50px !important;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 24px;
    margin-bottom: 80px;
    position: relative;
    z-index: 10;
}

.store-badge-wrapper {
    display: flex;
    align-items: center;
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.store-badge-wrapper:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}
.bg-white-badge {
    background: #000;
    padding: 0;
}

.browser-mockup {
    background-color: var(--card-bg);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    padding: 10px;
    box-shadow: var(--shadow-xl);
    max-width: 1000px;
    margin: 0 auto;
    position: relative;
    z-index: 10;
}

.browser-mockup img {
    width: 100%;
    border-radius: 6px;
    display: block;
    border: 1px solid var(--border-color);
}

/* Section Common */
.section-title {
    text-align: center;
    margin-bottom: 60px;
}

.sub-title {
    display: inline-block;
    color: var(--primary-color);
    font-weight: 700;
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 15px;
    font-family: 'Inter', sans-serif;
}

.section-title h2 {
    font-size: 2.8rem;
    margin-bottom: 20px;
    color: var(--text-color);
}

.section-title p {
    font-size: 1.2rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto;
}

/* Quick Start Section */
.quick-start-section {
    padding: 80px 0 100px;
    background-color: var(--bg-color);
}

.steps-container {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    position: relative;
    max-width: 1000px;
    margin: 0 auto;
}

.step-card {
    flex: 1;
    text-align: center;
    position: relative;
    z-index: 2;
    background: var(--card-bg);
    padding: 30px 20px;
    border-radius: 16px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: transform 0.3s;
}

.step-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.step-number {
    width: 40px;
    height: 40px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: bold;
    position: absolute;
    top: -20px;
    left: 50%;
    transform: translateX(-50%);
    box-shadow: var(--shadow-md);
}

.step-icon {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin: 20px 0 15px;
}

.step-card h3 {
    margin-bottom: 10px;
    font-size: 1.3rem;
}

.step-card p {
    color: var(--text-muted);
    font-size: 1.05rem;
}

.step-connector {
    flex: 0.5;
    height: 2px;
    background-color: var(--border-color);
    margin-top: 80px;
    position: relative;
    z-index: 1;
}
@media (max-width: 768px) {
    .steps-container { flex-direction: column; gap: 40px; }
    .step-connector { display: none; }
    .step-card { width: 100%; }
}

/* System Requirements Section */
.sys-req-section {
    padding: 80px 0;
    background-color: var(--bg-color);
}

.sys-req-card {
    background: linear-gradient(145deg, var(--card-bg) 0%, var(--bg-secondary) 100%);
    border-radius: 20px;
    padding: 50px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    gap: 40px;
}

.sys-req-content {
    flex: 1;
}

.req-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.req-list li {
    font-size: 1.1rem;
    padding: 15px;
    background-color: var(--bg-color);
    border-radius: 10px;
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
}

.req-list li strong {
    color: var(--primary-color);
    margin-right: 10px;
    width: 150px;
}

.req-list li strong i {
    width: 20px;
    text-align: center;
    margin-right: 8px;
}

.sys-req-icon {
    flex: 0.5;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 12rem;
    color: var(--primary-light);
    opacity: 0.8;
}

@media (max-width: 900px) {
    .sys-req-card { flex-direction: column-reverse; padding: 30px; }
    .req-list li { flex-direction: column; align-items: flex-start; gap: 5px; }
    .req-list li strong { width: auto; }
}

/* What's New Section */
.features-highlight {
    padding: 100px 0;
    background-color: var(--bg-secondary);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
}

.feature-card {
    padding: 32px;
    background-color: var(--card-bg);
    border-radius: 16px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    box-shadow: var(--shadow-sm);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.feature-icon {
    width: 60px;
    height: 60px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    margin-bottom: 24px;
}

/* Icon Colors */
.icon-blue { background: rgba(0, 120, 212, 0.1); color: #0078D4; }
.icon-purple { background: rgba(138, 43, 226, 0.1); color: #8A2BE2; }
.icon-orange { background: rgba(249, 115, 22, 0.1); color: #f97316; }
.icon-green { background: rgba(34, 197, 94, 0.1); color: #22c55e; }
.icon-red { background: rgba(239, 68, 68, 0.1); color: #ef4444; }
.icon-cyan { background: rgba(6, 182, 212, 0.1); color: #06b6d4; }

.feature-card h3 {
    margin-bottom: 16px;
    font-size: 1.3rem;
    color: var(--text-color);
}

.feature-card p {
    color: var(--text-muted);
    font-size: 1.05rem;
}

/* All Features Grouped Section */
.all-features-section {
    padding: 100px 0;
    background-color: var(--bg-color);
}

.feature-groups {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 40px;
}

.feature-group-card {
    background-color: var(--card-bg);
    border-radius: 16px;
    border: 1px solid var(--border-color);
    padding: 40px;
    box-shadow: var(--shadow-md);
}

.group-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
}

.group-header i {
    font-size: 2rem;
    color: var(--primary-color);
    background: var(--primary-light);
    width: 60px;
    height: 60px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.group-header h3 {
    font-size: 1.6rem;
}

.group-list {
    list-style: none;
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
}

.group-list li {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.1rem;
    color: var(--text-color);
}

.group-list li i {
    color: #22c55e; /* Green check */
    font-size: 1.2rem;
}

/* Screenshots Gallery */
.screenshots {
    padding: 100px 0;
    background-color: var(--bg-secondary);
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 30px;
}

.gallery-item {
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    background-color: var(--card-bg);
    box-shadow: var(--shadow-md);
    transition: transform 0.4s ease, box-shadow 0.4s ease;
}

.gallery-item:hover {
    transform: translateY(-8px) scale(1.01);
    box-shadow: var(--shadow-xl);
}

.gallery-item img {
    width: 100%;
    display: block;
    border-bottom: 1px solid var(--border-color);
}

.gallery-caption {
    padding: 20px;
    text-align: center;
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--text-color);
}

/* A to Z Features Section */
.atoz-section {
    padding: 100px 0;
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
}

.atoz-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.atoz-category {
    background-color: var(--bg-color);
    border-radius: 12px;
    padding: 30px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    transition: transform 0.3s, box-shadow 0.3s;
}

.atoz-category:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-light);
}

.atoz-category h3 {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.4rem;
    color: var(--primary-color);
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
}

.atoz-category h3 i {
    background-color: var(--primary-light);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    font-size: 1.1rem;
}

.atoz-category ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.atoz-category ul li {
    font-size: 1.05rem;
    color: var(--text-muted);
    position: relative;
    padding-left: 20px;
}

.atoz-category ul li::before {
    content: '•';
    color: var(--primary-color);
    position: absolute;
    left: 0;
    top: -2px;
    font-size: 1.2rem;
}

.atoz-category ul li strong {
    color: var(--text-color);
}

/* FAQ Section */
.faq-section {
    padding: 100px 0;
    background-color: var(--bg-color);
}

.faq-container {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.faq-item {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px 30px;
    box-shadow: var(--shadow-sm);
    transition: box-shadow 0.3s;
}

.faq-item:hover {
    box-shadow: var(--shadow-md);
}

.faq-question h3 {
    font-size: 1.3rem;
    color: var(--text-color);
    margin-bottom: 10px;
}

.faq-answer p {
    color: var(--text-muted);
    font-size: 1.1rem;
    line-height: 1.7;
}

/* Download Section */
.download-section {
    position: relative;
    padding: 120px 0;
    text-align: center;
    background: linear-gradient(135deg, #005a9e 0%, #0078D4 100%);
    color: white;
    overflow: hidden;
}

/* Decorative circles */
.download-section::before, .download-section::after {
    content: '';
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
}
.download-section::before {
    width: 400px; height: 400px;
    top: -100px; left: -100px;
}
.download-section::after {
    width: 600px; height: 600px;
    bottom: -200px; right: -200px;
}

.download-section h2 {
    font-size: 3rem;
    margin-bottom: 24px;
    color: white;
}

.download-section p {
    font-size: 1.3rem;
    margin-bottom: 50px;
    opacity: 0.95;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.download-cta .btn-primary {
    background-color: white;
    color: var(--primary-color);
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
}
.download-cta .btn-primary:hover {
    background-color: #f8fafc;
    transform: translateY(-3px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.3);
}

/* Community Section */
.community-section {
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    color: white;
    padding: 80px 0;
    text-align: center;
}
.community-section h2 {
    font-size: 2.2rem;
    margin-bottom: 15px;
}
.community-section > .container > p {
    font-size: 1.1rem;
    opacity: 0.8;
    margin-bottom: 40px;
}
.community-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
    margin-top: 20px;
}
.community-card {
    background: rgba(255,255,255,0.07);
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: 16px;
    padding: 36px 28px;
    text-decoration: none;
    color: white;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}
.community-card:hover {
    background: rgba(255,255,255,0.14);
    transform: translateY(-4px);
    border-color: #3b82f6;
}
.community-card i {
    font-size: 2.5rem;
    color: #60a5fa;
}
.community-card h3 {
    font-size: 1.2rem;
    margin: 0;
}
.community-card p {
    font-size: 0.95rem;
    opacity: 0.75;
    margin: 0;
}

/* Footer */
footer {
    background-color: var(--card-bg);
    padding: 80px 0 30px;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 40px;
    margin-bottom: 60px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.footer-brand h3 {
    font-size: 1.8rem;
    font-family: 'Inter', sans-serif;
}

.footer-brand .site-logo {
    height: 42px;
}

.footer-logo p {
    color: var(--text-muted);
    font-size: 1.1rem;
}

.footer-links h4 {
    margin-bottom: 20px;
    font-size: 1.2rem;
}

.footer-links p {
    color: var(--text-muted);
    margin-bottom: 8px;
    font-size: 1.05rem;
}

.social-links {
    display: flex;
    gap: 16px;
    margin-top: 20px;
}

.social-links a {
    color: var(--text-muted);
    font-size: 1.5rem;
    transition: color 0.2s, transform 0.2s;
    display: inline-block;
}

.social-links a:hover {
    color: var(--primary-color);
    transform: translateY(-3px);
}

.footer-bottom {
    text-align: center;
    color: var(--text-muted);
    font-size: 1rem;
    padding-top: 30px;
    border-top: 1px solid var(--border-color);
}

/* Animations */
@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

.pulse {
    animation: pulse 2s infinite ease-in-out;
}

/* Responsive */
@media (max-width: 1024px) {
    .feature-groups {
        grid-template-columns: 1fr;
    }
    .gallery-grid {
        grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    }
}

@media (max-width: 768px) {
    .nav-links { display: none; }
    .hero { padding: 140px 0 60px; }
    .hero h1 { font-size: 2.5rem; }
    .cta-buttons { flex-direction: column; width: 100%; max-width: 300px; margin: 0 auto 50px; }
    .cta-buttons > * { width: 100%; justify-content: center; }
    .store-badge-wrapper { width: 100%; }
    .store-badge-wrapper ms-store-badge { width: 100%; display: block; }
    .section-title h2 { font-size: 2.2rem; }
    .footer-content { flex-direction: column; text-align: center; }
    .footer-logo h3 { justify-content: center; }
    .social-links { justify-content: center; }
    
    .gallery-grid {
        grid-template-columns: 1fr;
    }
}