/* ==================== Variables & Root ==================== */
:root {
    --primary: #0066ff;
    --primary-dark: #0052cc;
    --primary-light: #e6f0ff;
    --secondary: #f72585;
    --light-bg: #f5f7fa;
    --text-dark: #1a1a1a;
    --text-muted: #666666;
    --border-color: #e0e0e0;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.1);
}

/* ==================== Global Styles ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    color: var(--text-dark);
    background-color: #ffffff;
    line-height: 1.6;
    overflow-x: hidden;
}

/* ==================== Typography ==================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 1rem;
}

h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
}

h2 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
}

p {
    color: var(--text-muted);
    margin-bottom: 1rem;
}

a {
    transition: all 0.3s ease;
}

a:hover {
    text-decoration: none;
}

/* ==================== Navbar ==================== */
.navbar {
    background-color: #fff !important;
    border-bottom: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.navbar-brand {
    font-size: 1.3rem;
    color: var(--text-dark) !important;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.navbar-brand i {
    font-size: 1.5rem;
}

.navbar-nav .nav-link {
    color: var(--text-dark) !important;
    font-weight: 500;
    margin: 0 0.5rem;
    position: relative;
    transition: color 0.3s ease;
}

.navbar-nav .nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    right: 0;
    height: 3px;
    background-color: var(--primary);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform 0.3s ease;
}

.navbar-nav .nav-link:hover::after {
    transform: scaleX(1);
    transform-origin: left;
}

.navbar-nav .nav-link:hover {
    color: var(--primary) !important;
}

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

/* ==================== Hero Section ==================== */
.hero-section {
    background: linear-gradient(135deg, #f5f7fa 0%, #ffffff 100%);
    padding: 80px 0 !important;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(0, 102, 255, 0.08) 0%, transparent 70%);
    border-radius: 50%;
    transform: translate(100px, -100px);
}

.hero-section h1 {
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.hero-section p {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 2rem;
}

.hero-section .btn {
    font-weight: 600;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.hero-section .btn-primary {
    background-color: var(--primary);
    border-color: var(--primary);
}

.hero-section .btn-primary:hover {
    background-color: var(--primary-dark);
    border-color: var(--primary-dark);
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(0, 102, 255, 0.3);
}

.hero-section .btn-outline-primary {
    color: var(--primary);
    border-color: var(--primary);
}

.hero-section .btn-outline-primary:hover {
    background-color: var(--primary);
    border-color: var(--primary);
    transform: translateY(-3px);
}

.hero-image {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    aspect-ratio: 16 / 9;
}

.hero-graphic {
    width: 100%;
    height: 100%;
    border-radius: 1rem;
    object-fit: cover;
    animation: float 3s ease-in-out infinite;
    mask-image: radial-gradient(circle at center, black 60%, transparent 100%);
    -webkit-mask-image: radial-gradient(circle at center, black 60%, transparent 100%);
    box-shadow: 
        inset 0 0 60px rgba(0, 0, 0, 0.1),
        0 20px 40px rgba(0, 0, 0, 0.08);
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-20px);
    }
}

@keyframes rotate {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

/* ==================== Features Section ==================== */
.features-section {
    padding: 80px 0 !important;
    background-color: var(--light-bg);
}

.features-section h2 {
    margin-bottom: 3rem;
    color: var(--text-dark);
}

.feature-card {
    background-color: #ffffff;
    border-radius: 1.5rem;
    padding: 2rem !important;
    transition: all 0.3s ease;
    border: 1px solid transparent;
    height: 100%;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.feature-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, rgba(0, 102, 255, 0.1) 0%, rgba(247, 37, 133, 0.05) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
    font-size: 2rem;
    color: var(--primary);
}

.feature-card:hover .feature-icon {
    background: linear-gradient(135deg, rgba(0, 102, 255, 0.2) 0%, rgba(247, 37, 133, 0.1) 100%);
    transform: scale(1.1);
}

.feature-card h5 {
    color: var(--text-dark);
    font-weight: 600;
}

/* ==================== Services Section ==================== */
.services-section {
    padding: 80px 0 !important;
}

.services-section h2 {
    margin-bottom: 3rem;
    color: var(--text-dark);
}

.service-item {
    background-color: var(--light-bg);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    border-radius: 1rem;
}

.service-item:hover {
    border-color: var(--primary);
    box-shadow: 0 8px 20px rgba(0, 102, 255, 0.15);
    transform: translateY(-5px);
}

.service-icon {
    width: 50px;
    height: 50px;
    background-color: #ffffff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--primary);
    border: 2px solid var(--primary-light);
}

.service-item:hover .service-icon {
    background-color: var(--primary);
    color: white;
    border-color: var(--primary);
}

.service-item h5 {
    color: var(--text-dark);
    font-weight: 600;
    font-size: 1.1rem;
}

/* ==================== Usage Section ==================== */
.usage-section {
    padding: 80px 0 !important;
    background-color: var(--light-bg);
}

.usage-section h2 {
    margin-bottom: 3rem;
    color: var(--text-dark);
}

.usage-card {
    background-color: #ffffff;
    border-radius: 1rem;
    border-left: 4px solid var(--primary);
    transition: all 0.3s ease;
}

.usage-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateX(5px);
}

.usage-icon {
    width: 50px;
    height: 50px;
    background-color: var(--primary-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--primary);
}

.usage-card h5 {
    color: var(--text-dark);
    font-weight: 600;
    margin-bottom: 1rem;
}

/* ==================== About Section ==================== */
.about-section {
    padding: 80px 0 !important;
}

.about-section h2 {
    margin-bottom: 3rem;
    color: var(--text-dark);
}

.about-section h3 {
    color: var(--text-dark);
    margin-bottom: 2rem;
    font-size: 1.8rem;
}

.about-image {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 400px;
}

.about-graphic {
    width: 200px;
    height: 200px;
    background: linear-gradient(135deg, rgba(247, 37, 133, 0.1) 0%, rgba(0, 102, 255, 0.05) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 5rem;
    animation: float 3s ease-in-out infinite;
}

.about-list {
    list-style: none;
}

.about-list li {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1.5rem;
    color: var(--text-muted);
    line-height: 1.6;
}

.about-list li i {
    margin-top: 3px;
    font-size: 1.2rem;
    flex-shrink: 0;
}

.about-list strong {
    color: var(--text-dark);
    font-weight: 600;
}

/* ==================== Download Section ==================== */
.download-section {
    padding: 80px 0 !important;
    background: linear-gradient(180deg, #f7f9ff 0%, #ffffff 60%);
    position: relative;
    overflow: hidden;
}

.download-section::before {
    content: '';
    position: absolute;
    top: -40px;
    left: -40px;
    width: 220px;
    height: 220px;
    background: radial-gradient(circle, rgba(0, 102, 255, 0.18) 0%, transparent 65%);
    pointer-events: none;
}

.download-section::after {
    content: '';
    position: absolute;
    bottom: -40px;
    right: -40px;
    width: 260px;
    height: 260px;
    background: radial-gradient(circle, rgba(247, 37, 133, 0.14) 0%, transparent 62%);
    pointer-events: none;
}

.download-section h2 {
    color: var(--text-dark);
    margin-bottom: 1rem;
}

/* Download Tabs */
.download-tabs {
    display: flex;
    justify-content: center;
    margin-bottom: 2rem;
    position: relative;
    z-index: 1;
}

.tabs-container {
    display: inline-flex;
    justify-content: center;
    gap: 0.75rem;
    flex-wrap: wrap;
    padding: 0.5rem;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.95);
    border: 1px solid rgba(0, 0, 0, 0.08);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
}

.tab-btn {
    padding: 0.85rem 1.8rem;
    background: transparent;
    border: none;
    border-radius: 999px;
    color: var(--text-muted);
    font-weight: 700;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.25s ease;
    position: relative;
}

.tab-btn:hover {
    color: var(--primary);
    transform: translateY(-1px);
}

.tab-btn.active {
    color: white;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    box-shadow: 0 12px 24px rgba(0, 102, 255, 0.18);
}

/* Tab Content */
.tab-content {
    display: none;
    animation: fadeIn 0.35s ease;
}

.tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Downloads Grid */
.downloads-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 1.8rem;
    margin: 2rem 0;
}

.download-card {
    background: rgba(255, 255, 255, 0.95);
    border: 1px solid rgba(255, 255, 255, 0.7);
    border-radius: 1.75rem;
    padding: 2rem;
    text-align: center;
    transition: all 0.35s ease;
    box-shadow: 0 20px 50px rgba(31, 55, 125, 0.08);
}

.download-card:hover {
    border-color: rgba(0, 102, 255, 0.22);
    box-shadow: 0 24px 70px rgba(31, 55, 125, 0.14);
    transform: translateY(-10px);
}

.card-top {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 1.5rem;
    position: relative;
    min-height: 160px;
}

.os-label {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 102, 255, 0.08);
    padding: 0.35rem 0.85rem;
    border-radius: 999px;
    color: var(--primary);
    font-weight: 700;
    font-size: 1.5rem;
    letter-spacing: 0.08em;
}

.os-icon {
    width: 90px;
    height: 90px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 5rem;
    background: rgba(0, 102, 255, 0.08);
    border-radius: 1.5rem;
}

.os-icon svg {
    width: 60%;
    height: 60%;
}

.download-card h5 {
    font-size: 1.35rem;
    color: var(--text-dark);
    margin: 0.6rem 0 0.6rem;
    font-weight: 700;
}

.version-info {
    color: var(--text-muted);
    font-size: 0.92rem;
    margin-bottom: 0.5rem;
    line-height: 1.5;
}

.btn-download {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.9rem 1.7rem;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    text-decoration: none;
    border-radius: 999px;
    font-weight: 700;
    transition: all 0.3s ease;
    margin-top: 1.2rem;
    border: none;
    cursor: pointer;
    font-size: 0.95rem;
    letter-spacing: 0.08em;
}

.btn-download:hover {
    transform: translateY(-2px);
    box-shadow: 0 14px 30px rgba(247, 37, 133, 0.25);
    color: white;
    text-decoration: none;
}

/* ==================== Contact Section ==================== */
.contact-section {
    padding: 80px 0 !important;
    background-color: var(--light-bg);
}

.contact-section h2 {
    margin-bottom: 3rem;
    color: var(--text-dark);
}

.contact-card {
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.contact-card:hover {
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.contact-icon {
    width: 80px;
    height: 80px;
    background-color: var(--primary-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
    font-size: 2.5rem;
    color: var(--primary);
}

.contact-card h4 {
    color: var(--text-dark);
    font-weight: 600;
}

.contact-methods p {
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.contact-methods a {
    color: var(--primary);
    font-weight: 500;
}

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

/* ==================== Footer ==================== */
footer {
    background-color: #1a1a1a !important;
    color: rgba(255, 255, 255, 0.8);
    margin-top: 80px;
}

footer h6 {
    color: white;
    font-weight: 600;
    margin-bottom: 1.5rem;
}

footer a {
    color: rgba(255, 255, 255, 0.6);
    text-decoration: none;
    transition: all 0.3s ease;
}

footer a:hover {
    color: var(--primary);
    text-decoration: none;
}

footer .opacity-75 {
    opacity: 0.75;
}

footer hr {
    border-color: rgba(255, 255, 255, 0.1);
}

/* ==================== Utilities ==================== */
.hover-bright:hover {
    opacity: 1 !important;
    color: var(--primary) !important;
}

.rounded-pill {
    border-radius: 50px !important;
}

/* ==================== Responsive Design ==================== */
@media (max-width: 768px) {
    :root {
        --shadow: 0 1px 4px rgba(0, 0, 0, 0.05);
    }

    h1 {
        font-size: 1.8rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    .hero-section {
        padding: 60px 0 !important;
    }

    .hero-image {
        height: 300px;
        margin-top: 2rem;
    }

    .hero-graphic {
        width: 180px;
        height: 180px;
        font-size: 4rem;
    }

    .features-section,
    .services-section,
    .usage-section,
    .about-section,
    .download-section,
    .cta-section,
    .contact-section {
        padding: 60px 0 !important;
    }

    .feature-card,
    .service-item {
        margin-bottom: 1rem;
    }

    .navbar-nav .nav-link {
        margin: 0.5rem 0;
    }

    .d-flex.gap-3 {
        gap: 1rem !important;
    }

    .hero-section::before {
        width: 300px;
        height: 300px;
        transform: translate(150px, -50px);
    }

    .cta-section::before {
        width: 250px;
        height: 250px;
        transform: translate(150px, -50px);
    }

    .downloads-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }

    .download-card {
        padding: 1.5rem;
    }

    .os-label {
        font-size: 0.9rem;
    }

    .os-icon {
        margin-top: 1.4rem;
    }

    .download-card h5 {
        font-size: 1.1rem;
        margin: 0.5rem 0 0.4rem;
    }

    .version-info {
        font-size: 0.85rem;
    }

    .about-image {
        height: 300px;
    }

    .about-graphic {
        width: 150px;
        height: 150px;
        font-size: 3.5rem;
    }

    .tabs-container {
        gap: 0.5rem;
    }

    .tab-btn {
        padding: 0.6rem 1.2rem;
        font-size: 0.9rem;
    }
}

@media (max-width: 576px) {
    h1 {
        font-size: 1.5rem;
    }

    h2 {
        font-size: 1.3rem;
    }

    .hero-section {
        padding: 40px 0 !important;
    }

    .hero-section p {
        font-size: 1rem;
    }

    .hero-section .d-flex {
        flex-direction: column;
    }

    .hero-section .btn {
        width: 100%;
    }

    .features-section,
    .services-section,
    .usage-section,
    .about-section,
    .download-section,
    .cta-section,
    .contact-section {
        padding: 40px 0 !important;
    }

    .feature-icon,
    .contact-icon {
        width: 60px;
        height: 60px;
        font-size: 1.5rem;
    }

    .contact-card {
        padding: 2rem 1.5rem !important;
    }

    .navbar-brand {
        font-size: 1.1rem;
    }

    .downloads-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .download-card {
        padding: 1.5rem;
    }

    .os-icon {
        width: 70px;
        height: 70px;
    }

    .os-label {
        font-size: 0.85rem;
    }

    .download-card h5 {
        font-size: 1rem;
        margin: 0.6rem 0 0.4rem;
    }

    .version-info {
        font-size: 0.8rem;
    }

    .btn-download {
        padding: 0.6rem 1.2rem;
        font-size: 0.9rem;
    }

    .tabs-container {
        gap: 0.3rem;
    }

    .tab-btn {
        padding: 0.5rem 1rem;
        font-size: 0.85rem;
    }

    .tab-btn.active {
        border-bottom-width: 2px;
    }
}

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

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

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

.slide-in-left {
    animation: slideInLeft 0.6s ease-out;
}

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

.slide-in-right {
    animation: slideInRight 0.6s ease-out;
}