/* =============== 
   CSS Variables (Design Tokens for V2) 
   =============== */
   :root {
    --primary-red: #E60012;
    --primary-red-hover: #C5000F;
    --dark-bg: #111827;
    --dark-surface: #1F2937;
    --text-main: #111827;
    --text-gray: #4B5563;
    --text-light: #9CA3AF;
    --white: #FFFFFF;
    --gray-50: #F9FAFB;
    --gray-100: #F3F4F6;
    --gray-200: #E5E7EB;
    
    --font-sans: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    
    --container: 1140px;
    --transition-fast: 0.2s ease-in-out;
}

/* =============== 
   Reset 
   =============== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-family: var(--font-sans);
    color: var(--text-main);
    background-color: var(--white);
    line-height: 1.5;
}

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

ul {
    list-style: none;
}

img, svg {
    display: block;
    max-width: 100%;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0,0,0,0);
    border: 0;
}

.container {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 20px;
}

/* =============== 
   Navbar V2 
   =============== */
.navbar-v2 {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--gray-200);
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 30px;
}

.nav-menu a:not(.btn-nav-download) {
    font-weight: 500;
    color: var(--text-gray);
}

.nav-menu a:not(.btn-nav-download):hover {
    color: var(--primary-red);
}

.btn-nav-download {
    background-color: var(--primary-red);
    color: var(--white);
    padding: 8px 20px;
    border-radius: 20px;
    font-weight: 600;
    font-size: 0.9rem;
}

.btn-nav-download:hover {
    background-color: var(--primary-red-hover);
    transform: translateY(-1px);
}

/* =============== 
   Hero V2 
   =============== */
.hero-v2 {
    position: relative;
    background-color: var(--gray-50);
    padding: 100px 0;
    overflow: hidden;
}

.hero-bg-pattern {
    position: absolute;
    top: -50%;
    right: -10%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(230,0,18,0.05) 0%, rgba(255,255,255,0) 70%);
    border-radius: 50%;
    z-index: 0;
}

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

.text-column {
    flex: 1;
}

.badge {
    display: inline-block;
    padding: 6px 12px;
    background-color: rgba(230, 0, 18, 0.1);
    color: var(--primary-red);
    border-radius: 100px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 24px;
}

.main-heading {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -1px;
    margin-bottom: 24px;
}

.text-primary {
    color: var(--primary-red);
}

.sub-heading {
    font-size: 1.2rem;
    color: var(--text-gray);
    margin-bottom: 40px;
    max-width: 500px;
}

.action-group {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.btn-primary-v2 {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    background-color: var(--primary-red);
    color: var(--white);
    padding: 16px 36px;
    border-radius: 8px;
    font-size: 1.2rem;
    font-weight: 600;
    width: fit-content;
    box-shadow: 0 10px 25px -5px rgba(230, 0, 18, 0.3);
}

.btn-primary-v2:hover {
    background-color: var(--primary-red-hover);
    transform: translateY(-2px);
    box-shadow: 0 15px 30px -5px rgba(230, 0, 18, 0.4);
}

.version-info {
    font-size: 0.85rem;
    color: var(--text-light);
    margin-left: 10px;
}

.image-column {
    flex: 1;
}

.floating-ui {
    filter: drop-shadow(0 25px 35px rgba(0,0,0,0.1));
    animation: floating 4s ease-in-out infinite;
}

@keyframes floating {
    0% { transform: translateY(0); }
    50% { transform: translateY(-15px); }
    100% { transform: translateY(0); }
}

/* =============== 
   Advantages (SEO Content) 
   =============== */
.advantages-section {
    padding: 100px 0;
    background-color: var(--white);
    text-align: center;
}

.section-title-v2 {
    font-size: 2.2rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.section-subtitle-v2 {
    font-size: 1.1rem;
    color: var(--text-gray);
    margin-bottom: 60px;
}

.adv-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.adv-card {
    text-align: left;
    padding: 40px 30px;
    border-radius: 16px;
    background-color: var(--gray-50);
    border: 1px solid var(--gray-100);
    transition: var(--transition-fast);
}

.adv-card:hover {
    background-color: var(--white);
    border-color: var(--gray-200);
    box-shadow: 0 20px 25px -5px rgba(0,0,0,0.05);
    transform: translateY(-5px);
}

.adv-icon {
    width: 60px;
    height: 60px;
    background-color: rgba(230, 0, 18, 0.05);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
}

.adv-card h3 {
    font-size: 1.3rem;
    margin-bottom: 16px;
}

.adv-card p {
    color: var(--text-gray);
    font-size: 0.95rem;
}

/* =============== 
   Download Box V2 
   =============== */
.download-v2 {
    padding: 60px 0 120px;
    background-color: var(--white);
}

.download-box {
    background-color: var(--dark-bg);
    border-radius: 24px;
    display: flex;
    overflow: hidden;
    color: var(--white);
    box-shadow: 0 25px 50px -12px rgba(0,0,0,0.25);
}

.box-left {
    flex: 1;
    padding: 60px;
    background: linear-gradient(to right bottom, #1F2937, #111827);
}

.box-left h2 {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.box-left p {
    color: var(--text-light);
    margin-bottom: 40px;
    font-size: 1.1rem;
}

.os-tabs {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.os-tab {
    background: transparent;
    border: 1px solid var(--gray-500);
    color: var(--text-light);
    padding: 16px 24px;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    text-align: left;
    cursor: pointer;
    transition: var(--transition-fast);
    border: 1px solid rgba(255,255,255,0.1);
}

.os-tab:hover {
    background-color: rgba(255,255,255,0.05);
}

.os-tab.active {
    background-color: var(--primary-red);
    color: var(--white);
    border-color: var(--primary-red);
}

.box-right {
    flex: 1;
    background-color: var(--dark-surface);
    padding: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.dl-panel {
    display: none;
    text-align: center;
    width: 100%;
}

.dl-panel.active {
    display: block;
    animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.sys-req {
    color: var(--text-light);
    margin-bottom: 30px;
    font-size: 1.1rem;
}

.btn-download-large {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: var(--white);
    color: var(--dark-bg);
    padding: 20px 40px;
    border-radius: 12px;
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.btn-download-large:hover {
    background-color: var(--gray-200);
    transform: scale(1.02);
}

.file-size {
    font-size: 0.9rem;
    color: var(--text-gray);
    font-weight: 400;
    margin-top: 4px;
}

.link-secondary {
    color: var(--text-light);
    text-decoration: underline;
    font-size: 0.95rem;
}

.link-secondary:hover {
    color: var(--white);
}

.qr-wrapper {
    background-color: var(--white);
    padding: 20px;
    border-radius: 16px;
    display: inline-block;
    margin-bottom: 20px;
}

.qr-desc {
    color: var(--text-light);
}

/* =============== 
   Footer V2 
   =============== */
.footer-v2 {
    background-color: #0F172A;
    color: var(--text-light);
    padding: 60px 0 20px;
}

.footer-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    padding-bottom: 40px;
    margin-bottom: 30px;
}

.brand-info p {
    margin-top: 12px;
    font-size: 0.9rem;
}

.seo-links {
    display: flex;
    gap: 20px;
    align-items: center;
}

.seo-links strong {
    color: var(--white);
}

.seo-links a {
    font-size: 0.9rem;
}

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

.footer-bottom {
    text-align: center;
    font-size: 0.85rem;
}

/* =============== 
   Responsive 
   =============== */
@media (max-width: 992px) {
    .hero-content {
        flex-direction: column;
        text-align: center;
    }
    
    .sub-heading {
        margin: 0 auto 40px;
    }
    
    .action-group {
        align-items: center;
    }
    
    .adv-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .download-box {
        flex-direction: column;
    }
    
    .box-left, .box-right {
        padding: 40px 30px;
    }
    
    .os-tabs {
        flex-direction: row;
        overflow-x: auto;
    }
    
    .os-tab {
        flex: 1;
        text-align: center;
        white-space: nowrap;
    }
    
    .footer-top {
        flex-direction: column;
        gap: 30px;
        text-align: center;
    }
}

@media (max-width: 768px) {
    .main-heading { font-size: 2.5rem; }
    .adv-grid { grid-template-columns: 1fr; }
    .nav-menu { display: none; }
}