/* NVIDIA Brand Guidelines & Design System Tokens */
:root {
    --nvidia-green: #76B900;
    --nvidia-green-hover: #8ADB00;
    --nvidia-green-glow: rgba(118, 185, 0, 0.25);
    --nvidia-black: #000000;
    --nvidia-dark: #111111;
    --nvidia-card-bg: #1A1A1A;
    --nvidia-border: #2A2A2A;
    --nvidia-text-main: #FFFFFF;
    --nvidia-text-muted: #999999;
    --nvidia-light-bg: #F8F9FA;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
    --border-radius: 8px;
    --box-shadow-card: 0 4px 20px rgba(0, 0, 0, 0.4);
    --box-shadow-green: 0 0 25px rgba(118, 185, 0, 0.3);
}

/* Reset & Global */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-family);
    background-color: var(--nvidia-black);
    color: var(--nvidia-text-main);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a {
    color: inherit;
    text-decoration: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    outline: none;
    background: none;
}

/* Header Navbar */
.header {
    background-color: var(--nvidia-black);
    border-bottom: 1px solid var(--nvidia-border);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 3rem;
}

.nvidia-logo {
    height: 32px;
    width: auto;
    color: #FFFFFF;
    transition: transform var(--transition-fast);
}

.logo-link:hover .nvidia-logo {
    transform: scale(1.02);
}

.main-nav {
    display: flex;
    gap: 2rem;
}

.main-nav a {
    font-size: 0.95rem;
    font-weight: 500;
    color: #CCCCCC;
    transition: color var(--transition-fast);
}

.main-nav a:hover {
    color: var(--nvidia-green);
}

.header-right {
    display: flex;
    align-items: center;
    gap: 1.2rem;
}

.icon-btn {
    color: #CCCCCC;
    padding: 0.5rem;
    border-radius: 50%;
    transition: color var(--transition-fast), background-color var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.icon-btn:hover {
    color: var(--nvidia-green);
    background-color: rgba(255, 255, 255, 0.05);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 5px;
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background-color: #FFFFFF;
    transition: all var(--transition-fast);
}

/* Hero Section */
.hero-section {
    background: linear-gradient(180deg, #0A0A0A 0%, var(--nvidia-black) 100%);
    padding: 4.5rem 1.5rem 3.5rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 300px;
    background: radial-gradient(circle, var(--nvidia-green-glow) 0%, rgba(0,0,0,0) 70%);
    pointer-events: none;
    opacity: 0.6;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: 2.8rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 0.75rem;
    background: linear-gradient(135deg, #FFFFFF 0%, #DDDDDD 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--nvidia-text-muted);
    margin-bottom: 2.5rem;
}

.search-box {
    position: relative;
    max-width: 600px;
    margin: 0 auto;
}

.search-icon {
    position: absolute;
    left: 1.25rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--nvidia-text-muted);
    pointer-events: none;
    transition: color var(--transition-fast);
}

.search-box input {
    width: 100%;
    padding: 1.1rem 3rem 1.1rem 3.25rem;
    font-size: 1.05rem;
    background-color: #141414;
    border: 2px solid var(--nvidia-border);
    border-radius: 40px;
    color: var(--nvidia-text-main);
    outline: none;
    transition: all var(--transition-fast);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

.search-box input:focus {
    border-color: var(--nvidia-green);
    background-color: #1A1A1A;
    box-shadow: var(--box-shadow-green);
}

.search-box input:focus + .search-icon {
    color: var(--nvidia-green);
}

.clear-search-btn {
    position: absolute;
    right: 1.25rem;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.5rem;
    color: var(--nvidia-text-muted);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-fast);
}

.clear-search-btn.visible {
    opacity: 1;
    visibility: visible;
}

.clear-search-btn:hover {
    color: #FFFFFF;
}

/* Tabs Section */
.tabs-container {
    background-color: var(--nvidia-black);
    border-bottom: 1px solid var(--nvidia-border);
    position: sticky;
    top: 65px;
    z-index: 900;
}

.tabs-wrapper {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    overflow-x: auto;
    scrollbar-width: none;
}

.tabs-wrapper::-webkit-scrollbar {
    display: none;
}

.tab-btn {
    padding: 0.6rem 1.4rem;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--nvidia-text-muted);
    border-radius: 30px;
    border: 1px solid transparent;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

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

.tab-btn.active {
    color: var(--nvidia-black);
    background-color: var(--nvidia-green);
    border-color: var(--nvidia-green);
    font-weight: 700;
}

/* Locations Section */
.locations-section {
    padding: 3rem 1.5rem 5rem;
    flex: 1;
}

.container {
    max-width: 1300px;
    margin: 0 auto;
}

.region-block {
    margin-bottom: 4rem;
    scroll-margin-top: 140px;
    transition: opacity var(--transition-smooth), transform var(--transition-smooth);
}

.region-block.hidden {
    display: none;
}

.region-title {
    font-size: 1.6rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--nvidia-border);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--nvidia-green);
}

.region-icon {
    font-size: 1.4rem;
}

.country-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.25rem;
}

.country-card {
    background-color: var(--nvidia-card-bg);
    border: 1px solid var(--nvidia-border);
    border-radius: var(--border-radius);
    padding: 1.25rem;
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.country-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 3px;
    height: 100%;
    background-color: var(--nvidia-green);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.country-card:hover {
    transform: translateY(-3px);
    border-color: #333333;
    box-shadow: var(--box-shadow-card);
    background-color: #222222;
}

.country-card:hover::after {
    opacity: 1;
}

.country-card.hidden {
    display: none !important;
}

.country-flag {
    font-size: 2rem;
    line-height: 1;
    flex-shrink: 0;
}

.country-info {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.country-name {
    font-size: 1.05rem;
    font-weight: 600;
    color: #FFFFFF;
}

.lang-link {
    font-size: 0.9rem;
    color: var(--nvidia-green);
    font-weight: 500;
    transition: color var(--transition-fast);
}

.lang-link:hover {
    color: var(--nvidia-green-hover);
    text-decoration: underline;
}

.lang-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.divider {
    color: #444444;
    font-size: 0.8rem;
}

/* No Results */
.no-results {
    text-align: center;
    padding: 4rem 1rem;
}

.no-results h3 {
    font-size: 1.5rem;
    margin: 1rem 0 0.5rem;
}

.no-results p {
    color: var(--nvidia-text-muted);
}

/* Footer */
.footer {
    background-color: #0B0B0B;
    border-top: 1px solid var(--nvidia-border);
    padding: 4rem 1.5rem 2rem;
    font-size: 0.9rem;
}

.footer-container {
    max-width: 1300px;
    margin: 0 auto;
}

.footer-top {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 2.5rem;
    margin-bottom: 3rem;
}

.footer-col h4 {
    color: #FFFFFF;
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 1.25rem;
}

.footer-col ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.footer-col a {
    color: var(--nvidia-text-muted);
    transition: color var(--transition-fast);
}

.footer-col a:hover {
    color: var(--nvidia-green);
}

.footer-divider {
    height: 1px;
    background-color: var(--nvidia-border);
    margin-bottom: 2rem;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.footer-legal p {
    color: var(--nvidia-text-muted);
    margin-bottom: 0.5rem;
}

.legal-links {
    display: flex;
    flex-wrap: wrap;
    gap: 1.25rem;
}

.legal-links a {
    color: var(--nvidia-text-muted);
    font-size: 0.85rem;
    transition: color var(--transition-fast);
}

.legal-links a:hover {
    color: #FFFFFF;
}

.footer-social {
    display: flex;
    gap: 1.25rem;
}

.footer-social a {
    color: var(--nvidia-text-muted);
    transition: color var(--transition-fast);
}

.footer-social a:hover {
    color: var(--nvidia-green);
}

/* Responsive Media Queries */
@media (max-width: 900px) {
    .main-nav {
        display: none;
    }
    .mobile-menu-btn {
        display: flex;
    }
    .hero-title {
        font-size: 2.2rem;
    }
    .hero-subtitle {
        font-size: 1rem;
    }
    .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
    }
}

@media (max-width: 600px) {
    .hero-title {
        font-size: 1.8rem;
    }
    .country-grid {
        grid-template-columns: 1fr;
    }
    .tabs-container {
        top: 60px;
    }
}