:root {
    --primary-color: #00305b;
    --secondary-color: #004080;
    --accent-color: #0066cc;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-light: #94a3b8;
    --surface-primary: #ffffff;
    --surface-secondary: #f8fafc;
    --surface-accent: #f1f5f9;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --container-max: 1280px;
    --container-padding: clamp(1rem, 5vw, 3rem);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    line-height: 1.7;
    color: var(--text-primary);
    background: var(--surface-primary);
    font-feature-settings: 'cv02', 'cv03', 'cv04', 'cv11';
    overflow-x: hidden;
}

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.header-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 1rem var(--container-padding);
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: relative;
}

.site-title {
    font-size: 1.75rem;
    font-weight: 800;
    letter-spacing: -0.025em;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    transition: all 0.3s ease;
}

.site-title a {
    text-decoration: none;
    display: block;
}

.site-nav {
    display: flex;
    gap: 0.5rem;
}

.site-nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius-lg);
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    font-size: 0.9rem;
}

.site-nav a:hover {
    color: var(--text-primary);
    background: var(--surface-accent);
    transform: translateY(-1px);
}

.site-nav a::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: var(--radius-lg);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    opacity: 0;
    transition: opacity 0.2s ease;
}

.site-nav a:active::before {
    opacity: 0.1;
}

main {
    padding-top: 5rem;
    position: relative;
    overflow: hidden;
}

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

.hero {
    position: relative;
    padding: 8rem 0 6rem;
    background: 
        radial-gradient(circle at 20% 80%, rgba(99, 102, 241, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(139, 92, 246, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(6, 182, 212, 0.1) 0%, transparent 50%);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: 
        conic-gradient(from 0deg at 50% 50%, 
            transparent 0deg, 
            rgba(99, 102, 241, 0.03) 90deg, 
            transparent 180deg, 
            rgba(139, 92, 246, 0.03) 270deg, 
            transparent 360deg);
    animation: rotate 60s linear infinite;
    pointer-events: none;
}

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

.hero-content {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    text-align: center;
    position: relative;
    z-index: 2;
}

.hero h1 {
    font-size: clamp(2.5rem, 8vw, 4.5rem);
    font-weight: 900;
    letter-spacing: -0.04em;
    line-height: 1.1;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    position: relative;
}

.hero h2 {
    font-size: clamp(1.25rem, 4vw, 1.75rem);
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    letter-spacing: -0.01em;
}

.hero p {
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    color: var(--text-secondary);
    max-width: 48rem;
    margin: 0 auto 3rem;
    line-height: 1.6;
}

.cta-button, .app-store-button {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 1rem 2.5rem;
    text-decoration: none;
    border-radius: var(--radius-xl);
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(255, 255, 255, 0.1);
    position: relative;
    overflow: hidden;
}

.cta-button::before, .app-store-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

.cta-button:hover::before, .app-store-button:hover::before {
    left: 100%;
}

.cta-button:hover, .app-store-button:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: var(--shadow-xl);
}

.features {
    padding: 6rem 0;
    background: var(--surface-secondary);
    position: relative;
}

.features::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-color), transparent);
}

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

.features h2 {
    text-align: center;
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 4rem;
    color: var(--text-primary);
    position: relative;
}

.features h2::after {
    content: '';
    position: absolute;
    bottom: -1rem;
    left: 50%;
    transform: translateX(-50%);
    width: 4rem;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.feature {
    background: var(--surface-primary);
    padding: 2.5rem 2rem;
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    group: feature;
}

.feature::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color), var(--accent-color));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s ease;
}

.feature:hover::before {
    transform: scaleX(1);
}

.feature:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

.feature h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    letter-spacing: -0.01em;
}

.feature p {
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 0.95rem;
}

.coming-soon {
    padding: 6rem 0;
    background: linear-gradient(135deg, var(--surface-accent) 0%, var(--surface-secondary) 100%);
    position: relative;
    overflow: hidden;
}

.coming-soon::before {
    content: '';
    position: absolute;
    top: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--accent-color), var(--primary-color), var(--secondary-color));
}

.coming-soon-content {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.coming-soon h2 {
    text-align: center;
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    position: relative;
}

.coming-soon h2::after {
    content: '';
    position: absolute;
    bottom: -1rem;
    left: 50%;
    transform: translateX(-50%);
    width: 4rem;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-color), var(--primary-color));
    border-radius: 2px;
}

.coming-soon-intro {
    text-align: center;
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 40rem;
    margin: 0 auto 4rem;
    line-height: 1.6;
}

.feature-planned {
    background: var(--surface-primary);
    border: 2px dashed var(--border-color);
    position: relative;
    overflow: visible;
}

.feature-planned::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-color), var(--primary-color), var(--secondary-color));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s ease;
}

.feature-planned:hover::before {
    transform: scaleX(1);
}

.feature-planned:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
    border-style: solid;
}

.feature-planned::after {
    content: 'Soon';
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: linear-gradient(135deg, var(--accent-color), var(--primary-color));
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-lg);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.i18n {
    padding: 6rem 0;
    background: var(--surface-secondary);
    position: relative;
}

.i18n-content {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.i18n h2 {
    text-align: center;
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    position: relative;
}

.i18n h2::after {
    content: '';
    position: absolute;
    bottom: -1rem;
    left: 50%;
    transform: translateX(-50%);
    width: 4rem;
    height: 3px;
    background: linear-gradient(90deg, var(--secondary-color), var(--accent-color));
    border-radius: 2px;
}

.i18n-intro {
    text-align: center;
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 40rem;
    margin: 0 auto 4rem;
    line-height: 1.6;
}

.languages-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 3rem;
    margin-top: 3rem;
}

.current-languages h3,
.planned-languages h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 2rem;
    text-align: center;
    letter-spacing: -0.02em;
}

.current-languages h3 {
    color: var(--primary-color);
}

.planned-languages h3 {
    color: var(--accent-color);
}

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

.language-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.25rem 1.5rem;
    background: var(--surface-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.language-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.language-item.language-planned {
    border: 2px dashed var(--border-color);
    opacity: 0.8;
}

.language-item.language-planned:hover {
    border-color: var(--accent-color);
    border-style: solid;
    opacity: 1;
}

.flag {
    font-size: 2rem;
    line-height: 1;
}

.language-name {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    flex-grow: 1;
}

.soon-badge {
    background: linear-gradient(135deg, var(--accent-color), var(--primary-color));
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-lg);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.screenshots {
    padding: 6rem 0;
    position: relative;
}

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

.screenshots h2 {
    text-align: center;
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 4rem;
    color: var(--text-primary);
    position: relative;
}

.screenshots h2::after {
    content: '';
    position: absolute;
    bottom: -1rem;
    left: 50%;
    transform: translateX(-50%);
    width: 4rem;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-color), var(--primary-color));
    border-radius: 2px;
}

.screenshot-gallery h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 3rem 0 2rem 0;
    color: var(--text-primary);
    letter-spacing: -0.02em;
    position: relative;
    padding-left: 1rem;
}

.screenshot-gallery h3::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 1.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
}

.screenshot-row {
    display: flex;
    gap: 2rem;
    margin-bottom: 3rem;
    overflow-x: auto;
    padding: 2rem 0;
    scroll-behavior: smooth;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.screenshot-row::-webkit-scrollbar {
    display: none;
}

.screenshot-row img {
    min-width: 280px;
    max-width: 280px;
    height: auto;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid var(--border-color);
}

.screenshot-row img:hover {
    transform: scale(1.05) rotate(1deg);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

.download {
    padding: 6rem 0;
    background: 
        linear-gradient(135deg, var(--surface-secondary) 0%, var(--surface-accent) 100%),
        radial-gradient(circle at 30% 70%, rgba(99, 102, 241, 0.1) 0%, transparent 50%);
    position: relative;
    overflow: hidden;
}

.download::before {
    content: '';
    position: absolute;
    top: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color), var(--accent-color));
}

.download-content {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    text-align: center;
    position: relative;
    z-index: 2;
}

.download h2 {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 2rem;
    color: var(--text-primary);
    line-height: 1.2;
}

.download p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
    max-width: 32rem;
    margin-left: auto;
    margin-right: auto;
}

.system-requirements {
    margin-top: 2rem;
    color: var(--text-light);
    font-size: 0.875rem;
    font-weight: 500;
}

.about {
    padding: 6rem 0;
    background: var(--surface-primary);
    position: relative;
}

.about-content {
    max-width: 48rem;
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.about h2 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 2rem;
    color: var(--text-primary);
    position: relative;
    padding-left: 1.5rem;
}

.about h2::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
}

.about p {
    margin-bottom: 1.5rem;
    color: var(--text-secondary);
    line-height: 1.8;
    font-size: 1.05rem;
}

.about p:last-child {
    margin-bottom: 0;
}

.about a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.2s ease;
    position: relative;
}

.about a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s ease;
}

.about a:hover::after {
    transform: scaleX(1);
}

.about a:hover {
    color: var(--secondary-color);
}

/* Privacy Policy */
.privacy-policy {
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.7;
}

.privacy-policy h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: #2c3e50;
}

.privacy-policy h2 {
    font-size: 1.8rem;
    margin: 2rem 0 1rem 0;
    color: #34495e;
}

.privacy-policy h3 {
    font-size: 1.3rem;
    margin: 1.5rem 0 0.5rem 0;
    color: #2c3e50;
}

.privacy-policy ul {
    margin: 1rem 0 1rem 2rem;
}

.privacy-policy li {
    margin-bottom: 0.5rem;
}

.privacy-policy p {
    margin-bottom: 1rem;
    color: #555;
}

.privacy-policy a {
    color: #667eea;
    text-decoration: none;
}

.privacy-policy a:hover {
    text-decoration: underline;
}

footer {
    background: linear-gradient(135deg, var(--text-primary) 0%, #1e293b 100%);
    color: var(--surface-primary);
    text-align: center;
    padding: 3rem 0;
    position: relative;
    overflow: hidden;
}

footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
}

.footer-content {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    position: relative;
    z-index: 2;
}

footer p {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.8);
    font-weight: 500;
}

footer a {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.2s ease;
    position: relative;
}

footer a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 1px;
    background: rgba(255, 255, 255, 0.6);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s ease;
}

footer a:hover::after {
    transform: scaleX(1);
}

footer a:hover {
    color: rgba(255, 255, 255, 1);
}

.site-branding {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.site-logo {
    height: 48px;
    width: 48px;
    object-fit: contain;
    display: block;
}

.logo-link {
    display: flex;
    align-items: center;
}

@media (max-width: 768px) {
    :root {
        --container-padding: 1.5rem;
    }
    
    .site-header {
        padding: 0.75rem 0;
    }
    
    .header-container {
        padding: 0 var(--container-padding);
    }
    
    .site-title {
        font-size: 1.5rem;
    }
    
    .site-nav {
        gap: 0.25rem;
    }
    
    .site-nav a {
        padding: 0.5rem 1rem;
        font-size: 0.85rem;
    }
    
    main {
        padding-top: 4rem;
    }
    
    .hero {
        padding: 6rem 0 4rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .feature {
        padding: 2rem 1.5rem;
    }
    
    .screenshot-row {
        gap: 1.5rem;
        padding: 1.5rem 0;
    }
    
    .screenshot-row img {
        min-width: 240px;
        max-width: 240px;
    }
    
    .language-grid {
        grid-template-columns: 1fr;
    }
    
    .features,
    .screenshots,
    .download,
    .about {
        padding: 4rem 0;
    }
}

@media (max-width: 480px) {
    :root {
        --container-padding: 1rem;
    }
    
    .hero {
        padding: 4rem 0 3rem;
    }
    
    .feature {
        padding: 1.5rem 1rem;
    }
    
    .screenshot-row img {
        min-width: 200px;
        max-width: 200px;
    }
    
    .features,
    .screenshots,
    .download,
    .about {
        padding: 3rem 0;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .hero::before {
        animation: none;
    }
}

@media (prefers-color-scheme: dark) {
    :root {
        --text-primary: #f8fafc;
        --text-secondary: #cbd5e1;
        --text-light: #64748b;
        --surface-primary: #0f172a;
        --surface-secondary: #1e293b;
        --surface-accent: #334155;
        --border-color: #334155;
    }
    
    .site-header {
        background: rgba(15, 23, 42, 0.95);
        border-bottom-color: var(--border-color);
    }
    
    .feature {
        background: var(--surface-secondary);
        border-color: var(--border-color);
    }
    
    .screenshot-row img {
        border-color: var(--border-color);
    }
}