:root {
    --bg-color: #0f0f1a;
    --card-bg: rgba(255, 255, 255, 0.05);
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.1);
    --accent-primary: #4facfe;
    --accent-secondary: #00f2fe;
    --text-primary: #ffffff;
    --text-secondary: #a0a0c0;
    --font-main: 'Outfit', 'Noto Sans JP', sans-serif;
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-main);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Typography */
h1, h2, h3 {
    font-weight: 700;
}

.gradient-text {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.text-center { text-align: center; }
.mb-2 { margin-bottom: 2rem; }
.mt-1 { margin-top: 1rem; }

/* Buttons */
.btn-primary, .btn-secondary, .btn-small, .btn-large {
    display: inline-block;
    padding: 12px 28px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 700;
    transition: var(--transition);
    cursor: pointer;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: #000;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(79, 172, 254, 0.3);
}

.btn-secondary {
    background: var(--card-bg);
    color: var(--text-primary);
    border: 1px solid var(--glass-border);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
}

.btn-small {
    padding: 8px 20px;
    font-size: 0.9rem;
}

.btn-large {
    padding: 16px 40px;
    font-size: 1.1rem;
}

/* Navbar */
#navbar {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    backdrop-filter: blur(10px);
    background: rgba(15, 15, 26, 0.8);
    border-bottom: 1px solid var(--glass-border);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.2rem;
}

.logo img {
    height: 32px;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 30px;
    align-items: center;
}

nav ul li a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

nav ul li a:hover {
    color: var(--text-primary);
}

/* Sections */
.section-padding {
    padding: 100px 0;
}

.alternate-bg {
    background: rgba(255, 255, 255, 0.02);
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: 3rem;
}

/* Hero */
#hero {
    padding: 150px 0 100px;
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero-container {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 50px;
    align-items: center;
}

.hero-content h1 {
    font-size: 4rem;
    line-height: 1.1;
    margin-bottom: 1.5rem;
}

.hero-content p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
}

.hero-btns {
    display: flex;
    gap: 20px;
}

.placeholder-img {
    background: var(--card-bg);
    border-radius: 20px;
    border: 1px solid var(--glass-border);
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.placeholder-img img {
    width: 100%;
    display: block;
}

/* Focus Grid */
.focus-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.focus-text h2 {
    font-size: 2.2rem;
    margin-bottom: 1rem;
}

/* Features */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.feature-card {
    background: var(--glass-bg);
    padding: 40px;
    border-radius: 24px;
    border: 1px solid var(--glass-border);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-10px);
    background: rgba(255, 255, 255, 0.06);
    border-color: var(--accent-primary);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
}

.feature-card h3 {
    margin-bottom: 1rem;
}

.feature-card p {
    color: var(--text-secondary);
}

/* Download Box */
.download-box {
    padding: 60px;
    border-radius: 30px;
    margin-top: 40px;
}

.glass {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
}

.text-muted {
    color: #666;
    margin: 10px 0 30px;
}

.small { font-size: 0.8rem; }

/* Footer */
#footer {
    padding: 50px 0;
    border-top: 1px solid var(--glass-border);
}

.footer-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-info p {
    color: var(--text-secondary);
}

.footer-links {
    display: flex;
    gap: 30px;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

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

/* Animations */
.fade-in {
    animation: fadeIn 1s ease-out;
}

.fade-in-delay {
    animation: fadeIn 1.2s ease-out both;
    animation-delay: 0.3s;
}

.fade-in-right {
    animation: fadeInRight 1s ease-out both;
    animation-delay: 0.5s;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInRight {
    from { opacity: 0; transform: translateX(50px); }
    to { opacity: 1; transform: translateX(0); }
}

/* Responsive */
@media (max-width: 900px) {
    .hero-container, .focus-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-content h1 {
        font-size: 3rem;
    }
    
    .hero-btns {
        justify-content: center;
    }
    
    .hero-image {
        order: -1;
    }
}

@media (max-width: 600px) {
    nav {
        display: none;
    }
    
    .hero-content h1 {
        font-size: 2.5rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
}

/* Autolingua Section */
#autolingua {
    background: radial-gradient(circle at 10% 20%, rgba(132, 60, 246, 0.1) 0%, rgba(0, 0, 0, 0) 40%),
                radial-gradient(circle at 90% 80%, rgba(0, 242, 254, 0.05) 0%, rgba(0, 0, 0, 0) 40%);
    position: relative;
    overflow: hidden;
}

.autolingua-badge {
    background: rgba(132, 60, 246, 0.2);
    color: #b18cff;
    padding: 6px 16px;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 700;
    display: inline-block;
    margin-bottom: 1.5rem;
    border: 1px solid rgba(132, 60, 246, 0.3);
}

.autolingua-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.autolingua-visual {
    position: relative;
}

.autolingua-visual::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 120%;
    height: 120%;
    background: radial-gradient(circle, rgba(132, 60, 246, 0.2) 0%, transparent 70%);
    z-index: -1;
}

.autolingua-features {
    list-style: none;
    margin-top: 2rem;
}

.autolingua-features li {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.autolingua-features li::before {
    content: '✦';
    color: #b18cff;
    font-weight: bold;
}

.btn-autolingua {
    background: linear-gradient(135deg, #843cf6, #00f2fe);
    color: #fff;
    border: none;
}

.btn-autolingua:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(132, 60, 246, 0.4);
}

@media (max-width: 900px) {
    .autolingua-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .autolingua-features li {
        justify-content: center;
    }

    .autolingua-title-wrapper {
        justify-content: center;
    }
}

.autolingua-img {
    position: relative;
}