/* ============================================
   Kivode+ — Main Stylesheet
   ============================================ */

:root {
    /* Core Colors */
    --color-bg-primary: #0a0a0f;
    --color-bg-secondary: #0f0f14;
    --color-bg-tertiary: #16161c;
    --color-bg-card: #1a1a22;
    --color-bg-hover: #22222c;
    
    /* Purple Gradient Background */
    --color-purple-deep: #1a0b2e;
    --color-purple-mid: #0f0f14;
    --color-gradient-bg: linear-gradient(180deg, #1a0b2e 0%, #0f0f14 50%, #0a0a0f 100%);
    
    /* Accent Colors - White/Silver */
    --color-accent-primary: #ffffff;
    --color-accent-secondary: #e2e8f0;
    --color-accent-muted: #94a3b8;
    
    /* Text Colors */
    --color-text-primary: #f8fafc;
    --color-text-secondary: #cbd5e1;
    --color-text-muted: #64748b;
    --color-text-subtle: #475569;
    
    /* Borders */
    --color-border: rgba(148, 163, 184, 0.08);
    --color-border-hover: rgba(148, 163, 184, 0.15);
    --color-border-accent: rgba(255, 255, 255, 0.1);
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 0.75rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;
    
    /* Radii */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    
    /* Transitions */
    --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6);
    --shadow-glow: 0 0 40px rgba(255, 255, 255, 0.03);

    /* Layout */
    --nav-height: 72px;
}

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

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

body {
    font-family: var(--font-primary);
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

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

/* Utility Classes */
.desktop-only { 
    display: flex; 
}

.mobile-only { 
    display: none !important; 
}

.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

/* ============================================
   Navigation
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 10000;
    background: rgba(10, 10, 15, 0.98);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    transition: background var(--transition-base);
    overflow: visible;
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--nav-height);
    padding: 0 var(--space-lg);
    max-width: 1280px;
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.logo-icon {
    width: 36px;
    height: 36px;
    display: block;
    object-fit: contain;
}

.logo-text {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
}

.logo-main {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--color-text-primary);
    letter-spacing: -0.02em;
}

.logo-sub {
    font-size: 0.6875rem;
    font-weight: 500;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.nav-links {
    align-items: center;
    gap: var(--space-xl);
}

.nav-link {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--color-accent-primary);
    transition: width var(--transition-fast);
}

.nav-link:hover {
    color: var(--color-text-primary);
}

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

.nav-actions {
    align-items: center;
    gap: var(--space-sm);
}

/* ============================================
   Mobile Menu - Unified & Fixed
   ============================================ */
.menu-toggle {
    display: none;
    width: 32px;
    height: 32px;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 1001;
}

.menu-toggle .menu-bar {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--color-text-primary);
    transition: all var(--transition-fast);
    border-radius: 1px;
}

.menu-toggle.active .menu-bar:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.active .menu-bar:nth-child(2) {
    opacity: 0;
}

.menu-toggle.active .menu-bar:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

.mobile-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    height: calc(100dvh - var(--nav-height));
    background: var(--color-bg-primary);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    transform: translateX(100%);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: transform 0.3s ease-in-out, opacity 0.25s ease-in-out, visibility 0.25s ease-in-out;
    z-index: 9999;
    overflow-y: auto;
    display: block;
}

.mobile-menu.active {
    transform: translateX(0);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

.mobile-menu-content {
    padding: var(--space-xl);
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.mobile-link {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text-primary);
    padding: var(--space-md) 0;
    border-bottom: 1px solid var(--color-border);
    display: block;
    text-decoration: none;
}

.mobile-actions {
    margin-top: var(--space-lg);
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    padding: 0.625rem 1.25rem;
    font-family: var(--font-primary);
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.btn-primary {
    background: var(--color-text-primary);
    color: var(--color-bg-primary);
}

.btn-primary:hover {
    background: var(--color-accent-secondary);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(255, 255, 255, 0.15);
}

.btn-secondary {
    background: transparent;
    color: var(--color-text-primary);
    border: 1px solid var(--color-border-accent);
}

.btn-secondary:hover:not(:disabled) {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.2);
}

.btn-ghost {
    background: transparent;
    color: var(--color-text-secondary);
    padding: 0.5rem;
}

.btn-ghost:hover {
    color: var(--color-text-primary);
}

.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.btn-large {
    padding: 0.875rem 1.5rem;
    font-size: 0.9375rem;
}

.btn-full {
    width: 100%;
}

.btn-icon {
    width: 18px;
    height: 18px;
}

.btn-icon-right {
    width: 16px;
    height: 16px;
    margin-left: 4px;
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
    background: var(--color-gradient-bg);
}

.hero-background {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.hero-image-container {
    position: relative;
    width: 100%;
    height: 100%;
}

.hero-bg-image {
    position: absolute;
    right: 0;
    top: 0;
    width: 70%;
    height: 100%;
    object-fit: cover;
    opacity: 0.6;
}

.hero-overlay-left {
    position: absolute;
    left: 0;
    top: 0;
    width: 60%;
    height: 100%;
    background: linear-gradient(90deg, 
        rgba(0, 0, 0, 0.95) 0%, 
        rgba(0, 0, 0, 0.8) 30%,
        rgba(0, 0, 0, 0.4) 60%,
        transparent 100%
    );
}

.hero-overlay-gradient {
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at 30% 50%, rgba(26, 11, 46, 0.8) 0%, transparent 70%);
}

.hero-content-wrapper {
    position: relative;
    z-index: 1;
    width: 100%;
    padding-top: 72px;
}

.hero-content {
    max-width: 640px;
    padding: var(--space-4xl) 0;
}

.hero-eyebrow {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
}

.eyebrow-badge {
    padding: 0.375rem 0.875rem;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--color-border-accent);
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.eyebrow-text {
    font-size: 0.875rem;
    color: var(--color-accent-muted);
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: var(--space-lg);
    color: var(--color-text-primary);
}

.title-highlight {
    color: var(--color-accent-muted);
    font-weight: 300;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--space-xl);
    max-width: 560px;
}

.hero-actions {
    display: flex;
    gap: var(--space-md);
    margin-bottom: var(--space-3xl);
    flex-wrap: wrap;
}

.hero-stats {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
    padding-top: var(--space-xl);
    border-top: 1px solid var(--color-border);
}

.stat-item {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.stat-number {
    font-family: var(--font-mono);
    font-size: 2rem;
    font-weight: 600;
    color: var(--color-text-primary);
    line-height: 1;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    font-weight: 500;
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: var(--color-border);
}

/* ============================================
   Models Section
   ============================================ */
.models-section {
    padding: var(--space-4xl) 0;
    background: var(--color-bg-primary);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.models-header {
    text-align: center;
    margin-bottom: var(--space-2xl);
}

.models-title {
    font-size: 1.875rem;
    font-weight: 700;
    margin-top: var(--space-sm);
}

.models-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-xl);
    max-width: 1000px;
    margin: 0 auto;
}

.model-category {
    text-align: center;
}

.category-name {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-muted);
    margin-bottom: var(--space-sm);
}

.model-tags {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-xs);
}

.model-tag {
    padding: 0.5rem 0.875rem;
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
}

.model-tag:hover {
    border-color: var(--color-border-hover);
    color: var(--color-text-primary);
    transform: translateY(-2px);
}

/* ============================================
   Section Headers
   ============================================ */
.section-header {
    text-align: center;
    margin-bottom: var(--space-3xl);
}

.section-eyebrow {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-text-muted);
    margin-bottom: var(--space-md);
}

.section-title {
    font-size: clamp(1.875rem, 4vw, 2.75rem);
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    margin-top: var(--space-md);
}

/* ============================================
   Features Section
   ============================================ */
.features {
    padding: var(--space-4xl) 0;
    background: var(--color-bg-secondary);
}

.feature-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3xl);
    align-items: center;
    margin-bottom: var(--space-4xl);
    padding: var(--space-xl) 0;
}

.feature-row:last-child {
    margin-bottom: 0;
}

.feature-reverse .feature-content {
    order: 2;
}

.feature-reverse .feature-visual {
    order: 1;
}

/* Scroll reveal animations for homepage sections */
.js-enabled .scroll-reveal {
    opacity: 0;
    transform: translateY(18px);
    transition: opacity 0.45s ease-out, transform 0.45s ease-out;
    transition-delay: calc(var(--reveal-index, 0) * 24ms);
}

.js-enabled .scroll-reveal.is-revealed {
    opacity: 1;
    transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
    .js-enabled .scroll-reveal,
    .js-enabled .scroll-reveal.is-revealed {
        opacity: 1;
        transform: none;
        transition: none;
    }
}

.feature-content {
    max-width: 520px;
}

.feature-meta {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
}

.feature-number {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text-muted);
}

.feature-line {
    flex: 1;
    height: 1px;
    background: linear-gradient(90deg, var(--color-border) 0%, transparent 100%);
    max-width: 100px;
}

.feature-title {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: var(--space-md);
    line-height: 1.3;
    color: var(--color-text-primary);
}

.feature-description {
    font-size: 1.0625rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--space-lg);
}

.feature-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.feature-list li {
    position: relative;
    padding-left: 1.25rem;
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
}

.feature-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.55em;
    width: 5px;
    height: 5px;
    background: var(--color-text-muted);
    border-radius: 50%;
}

.feature-visual {
    position: relative;
}

.feature-image-wrapper {
    position: relative;
    border-radius: var(--radius-2xl);
    overflow: hidden;
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-xl);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.feature-image-wrapper:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl), var(--shadow-glow);
}

.feature-image-wrapper img {
    width: 100%;
    height: auto;
    object-fit: cover;
    display: block;
}

.feature-glow {
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 50% 50%, rgba(255, 255, 255, 0.03) 0%, transparent 70%);
    pointer-events: none;
}

/* ============================================
   Security Section
   ============================================ */
.security {
    padding: var(--space-4xl) 0;
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
}

.security-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3xl);
    align-items: center;
}

.security-description {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-top: var(--space-md);
    margin-bottom: var(--space-xl);
}

.security-features {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.security-item {
    display: flex;
    gap: var(--space-md);
}

.security-icon-wrap {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    color: var(--color-text-primary);
    flex-shrink: 0;
}

.security-icon-wrap svg {
    width: 20px;
    height: 20px;
}

.security-item-content h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: 0.25rem;
}

.security-item-content p {
    font-size: 0.9375rem;
    color: var(--color-text-muted);
}

.security-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.security-badge-large {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-lg) var(--space-xl);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-lg);
}

.badge-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(16, 185, 129, 0.1);
    border-radius: var(--radius-xl);
    color: #10b981;
}

.badge-icon svg {
    width: 28px;
    height: 28px;
}

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

.badge-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: #10b981;
    margin-bottom: 0.25rem;
}

.badge-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--color-text-primary);
}

/* ============================================
   Footer
   ============================================ */
.footer {
    padding: var(--space-4xl) 0 var(--space-xl);
    background: var(--color-bg-primary);
    border-top: 1px solid var(--color-border);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--space-3xl);
    margin-bottom: var(--space-3xl);
}

.footer-description {
    color: var(--color-text-muted);
    font-size: 0.9375rem;
    line-height: 1.6;
    margin-top: var(--space-md);
    max-width: 280px;
}

.footer-column h4 {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-primary);
    margin-bottom: var(--space-md);
}

.footer-column a {
    display: block;
    color: var(--color-text-muted);
    font-size: 0.9375rem;
    margin-bottom: var(--space-sm);
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--space-xl);
    border-top: 1px solid var(--color-border);
}

.footer-bottom p {
    font-size: 0.875rem;
    color: var(--color-text-subtle);
}

.footer-social a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    color: var(--color-text-muted);
    transition: all var(--transition-fast);
}

.footer-social a:hover {
    background: var(--color-bg-hover);
    border-color: var(--color-border-hover);
    color: var(--color-text-primary);
}

.footer-social svg {
    width: 20px;
    height: 20px;
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 1024px) {
    .hero-bg-image {
        width: 80%;
        opacity: 0.4;
    }
    
    .hero-overlay-left {
        width: 70%;
    }
    
    .feature-row {
        gap: var(--space-xl);
    }
    
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .desktop-only { 
        display: none !important; 
    }
    
    .mobile-only { 
        display: flex !important; 
    }
    
    /* Show burger menu on mobile */
    .menu-toggle {
        display: flex !important;
    }
    
    /* Mobile hero adjustments */
    .hero-bg-image {
        width: 100%;
        opacity: 0.3;
        object-position: center;
    }
    
    /* Black gradient from bottom - smaller height */
    .hero-overlay-left {
        width: 100%;
        height: 70%;
        top: auto;
        bottom: 0;
        background: linear-gradient(0deg, 
            rgba(0, 0, 0, 0.98) 0%, 
            rgba(0, 0, 0, 0.9) 30%,
            rgba(0, 0, 0, 0.6) 60%,
            transparent 100%
        );
    }
    
    .hero-content {
        padding: var(--space-2xl) 0;
        text-align: center;
    }
    
    .hero-description {
        margin-left: auto;
        margin-right: auto;
    }
    
    .hero-actions {
        justify-content: center;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .feature-row,
    .feature-reverse {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }
    
    .feature-content {
        order: 2 !important;
        max-width: 100%;
    }
    
    .feature-visual {
        order: 1 !important;
    }
    
    .security-grid {
        grid-template-columns: 1fr;
        gap: var(--space-2xl);
    }
    
    .security-visual {
        order: -1;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
        text-align: center;
    }
    
    .footer-description {
        margin-left: auto;
        margin-right: auto;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: var(--space-md);
    }
    
    .models-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

@media (max-width: 480px) {
    :root {
        --nav-height: 64px;
        --space-lg: 1rem;
        --space-xl: 1.25rem;
        --space-2xl: 1.5rem;
        --space-3xl: 2rem;
        --space-4xl: 3rem;
    }
    
    
    .hero-actions {
        flex-direction: column;
        width: 100%;
    }
    
    .btn-large {
        width: 100%;
        justify-content: center;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: var(--space-lg);
    }
    
    .stat-divider {
        width: 40px;
        height: 1px;
    }
    
    .feature-title {
        font-size: 1.5rem;
    }
    
    .security-badge-large {
        flex-direction: column;
        text-align: center;
    }
}

/* Animation Classes */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}


@media (max-width: 640px) {
    .footer-brand {
        display: flex;
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .footer-brand .logo {
        justify-content: center;
    }

    .footer-links {
        width: 100%;
        display: grid;
        grid-template-columns: repeat(3, minmax(0, 1fr));
        gap: var(--space-md);
        text-align: center;
    }

    .footer-column h4 {
        font-size: 0.68rem;
        letter-spacing: 0.08em;
    }

    .footer-column a {
        font-size: 0.8125rem;
        margin-bottom: 0.45rem;
    }
}

/* ============================================
   Premium Upgrade Pack
   ============================================ */
:root {
    --nav-height: 70px;
}

html, body {
    transition: all var(--transition-base);
}

body {
    font-size: clamp(0.95rem, 0.2vw + 0.9rem, 1.05rem);
}


.info-section {
    padding: var(--space-3xl) 0;
    border-top: 1px solid var(--color-border);
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--space-lg);
}

.info-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-lg);
    color: var(--color-text-secondary);
}

.info-steps {
    list-style: decimal;
    margin: 0;
    padding-left: 1.25rem;
    display: grid;
    gap: var(--space-sm);
    color: var(--color-text-secondary);
}

.roadmap-list {
    margin: 0;
}


.navbar {
    background: rgba(10, 10, 15, 0.72);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.22);
}

.navbar.is-scrolled {
    background: rgba(10, 10, 15, 0.9);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.35);
}

.nav-link::after { height: 2px; transition: width 0.25s ease; }

.btn, .menu-toggle, .mobile-link, .copy-hash, .back-to-top { min-height: 44px; }

.menu-toggle {
    width: 38px;
    height: 38px;
    border: 1px solid var(--color-border);
    border-radius: 10px;
    background: rgba(255,255,255,0.025);
    color: #ffffff;
}

.js-enabled .menu-toggle .menu-bar { display: none; }
.menu-toggle svg { width: 18px; height: 18px; color: #ffffff; stroke: #ffffff; }
.menu-icon-open,
.menu-icon-close {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    background: transparent;
}
.menu-icon-close { display: none; }
.menu-toggle.active .menu-icon-open { display: none; }
.menu-toggle.active .menu-icon-close { display: inline-flex; }

.mobile-menu {
    position: fixed;
    top: var(--nav-height);
    height: calc(100dvh - var(--nav-height));
    background: linear-gradient(180deg, rgba(12, 12, 20, 0.98), rgba(10, 10, 15, 0.98));
    transform: translateY(-10px);
}
.mobile-menu.active { transform: translateY(0); }
.mobile-link { opacity: 0; transform: translateY(8px); transition: all .35s ease; }
.mobile-menu.active .mobile-link { opacity: 1; transform: translateY(0); }
.mobile-menu.active .mobile-link:nth-child(2) { transition-delay: .04s; }
.mobile-menu.active .mobile-link:nth-child(3) { transition-delay: .08s; }
.mobile-menu.active .mobile-link:nth-child(4) { transition-delay: .12s; }

.lang-toggle .lang-flag { width: 18px; height: 18px; display: inline-flex; }
.lang-toggle .lang-flag svg { width: 100%; height: 100%; }

.footer {
    background: linear-gradient(180deg, #09090c, #060608);
}
.footer-social { display: flex; gap: var(--space-sm); }

.back-to-top {
    position: fixed;
    right: 20px;
    bottom: 20px;
    width: 48px;
    border-radius: 50%;
    border: 1px solid var(--color-border);
    color: var(--color-text-primary);
    background: rgba(30, 30, 40, 0.75);
    backdrop-filter: blur(10px);
    opacity: 0;
    transform: translateY(12px);
    pointer-events: none;
    transition: all var(--transition-base);
    z-index: 999;
}
.back-to-top.visible { opacity: 1; transform: translateY(0); pointer-events: auto; }
.back-to-top svg { width: 20px; height: 20px; }

.checksum-cell {
    display: flex;
    align-items: center;
    gap: 8px;
}
.copy-hash {
    width: 44px;
    height: 44px;
    border: 1px solid var(--color-border);
    background: var(--color-bg-secondary);
    color: var(--color-text-secondary);
    border-radius: 10px;
    cursor: pointer;
}
.copy-hash.copied { color: #34d399; border-color: rgba(52, 211, 153, 0.45); }
.copy-hash svg { width: 18px; height: 18px; }

@media (max-width: 768px) {
    :root { --nav-height: 60px; }
}

@media (max-width: 320px) { .container, .nav-container { padding-left: .75rem; padding-right: .75rem; } }
@media (min-width: 480px) { .container, .nav-container { max-width: 460px; } }
@media (min-width: 768px) { .container, .nav-container { max-width: 740px; } }
@media (min-width: 1024px) { .container, .nav-container { max-width: 980px; } }
@media (min-width: 1440px) { .container, .nav-container { max-width: 1320px; } }
@media (min-width: 1920px) { .container, .nav-container { max-width: 1560px; } }


/* LTR directional consistency */
html[dir='ltr'] body {
    direction: ltr;
}

/* ============================================
   Error 404 Page
   ============================================ */
.error-hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: calc(var(--nav-height) + var(--space-3xl)) 0 var(--space-4xl);
    background:
        radial-gradient(circle at 20% 15%, rgba(127, 29, 29, 0.18), transparent 40%),
        radial-gradient(circle at 85% 25%, rgba(76, 29, 149, 0.2), transparent 45%),
        var(--color-gradient-bg);
}

.error-hero-card {
    max-width: 740px;
    margin: 0 auto;
    text-align: center;
    padding: clamp(1.5rem, 4vw, 3rem);
    background: linear-gradient(180deg, rgba(30, 30, 42, 0.9), rgba(16, 16, 24, 0.92));
    border: 1px solid var(--color-border-hover);
    border-radius: var(--radius-2xl);
    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.45);
}

.error-code {
    font-family: var(--font-mono);
    font-size: clamp(4rem, 13vw, 8rem);
    line-height: 1;
    letter-spacing: -0.04em;
    color: var(--color-accent-primary);
    margin: var(--space-sm) 0 var(--space-lg);
    text-shadow: 0 0 35px rgba(255, 255, 255, 0.08);
}

.error-title {
    font-size: clamp(1.6rem, 3vw, 2.4rem);
    line-height: 1.2;
    margin-bottom: var(--space-md);
}

.error-description {
    color: var(--color-text-secondary);
    max-width: 55ch;
    margin: 0 auto;
}

.error-actions {
    margin-top: var(--space-xl);
    display: flex;
    justify-content: center;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

@media (max-width: 768px) {
    .error-hero {
        padding-top: calc(var(--nav-height) + var(--space-2xl));
    }
}