:root {
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --bg-color: #f8fafc;
    --text-main: #334155;
    --text-dark: #0f172a;
    --text-light: #64748b;
    --surface: #ffffff;
    --border: #e2e8f0;
    --accent-green: #10b981;
    --accent-purple: #8b5cf6;
}

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

body { 
    font-family: 'Inter', 'Noto Sans JP', sans-serif; 
    background-color: var(--bg-color); 
    color: var(--text-main); 
    line-height: 1.6; 
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

/* Navbar */
header {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-dark);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    letter-spacing: -0.025em;
}

.nav-buttons {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.btn {
    display: inline-block;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    padding: 0.6rem 1.5rem;
    border-radius: 8px;
    transition: all 0.2s;
}

.btn-outline {
    color: var(--text-dark);
    background: transparent;
    border: 1px solid var(--border);
}

.btn-outline:hover {
    background: #f1f5f9;
}

.btn-primary {
    color: #fff;
    background: var(--primary);
    border: 1px solid var(--primary);
    box-shadow: 0 4px 6px -1px rgba(79, 70, 229, 0.2);
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 6px 8px -1px rgba(79, 70, 229, 0.3);
}

/* Hero Section */
.hero {
    padding: 10rem 2rem 6rem;
    text-align: center;
    max-width: 1000px;
    margin: 0 auto;
    position: relative;
}

/* Background Effects */
.bg-glow {
    position: absolute;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(79, 70, 229, 0.15) 0%, rgba(255,255,255,0) 70%);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: -1;
    pointer-events: none;
}

h1.hero-title {
    font-size: clamp(3rem, 5vw, 4.5rem);
    font-weight: 900;
    color: var(--text-dark);
    line-height: 1.1;
    margin-bottom: 1.5rem;
    letter-spacing: -0.03em;
}

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

p.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-light);
    margin-bottom: 3rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.hero-actions .btn {
    padding: 1rem 2rem;
    font-size: 1.1rem;
    border-radius: 12px;
}

/* Features Section */
.features {
    padding: 5rem 2rem;
    background: var(--surface);
    border-top: 1px solid var(--border);
}

.features-container {
    max-width: 1200px;
    margin: 0 auto;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--text-dark);
    margin-bottom: 4rem;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--bg-color);
    padding: 2.5rem;
    border-radius: 20px;
    border: 1px solid var(--border);
    transition: transform 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    display: inline-block;
    background: var(--surface);
    padding: 1rem;
    border-radius: 16px;
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05);
}

.feature-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 1rem;
}

.feature-desc {
    color: var(--text-light);
    font-size: 0.95rem;
}

/* Footer */
footer {
    padding: 4rem 2rem;
    text-align: center;
    background: var(--bg-color);
    border-top: 1px solid var(--border);
    color: var(--text-light);
}

.footer-links {
    margin-bottom: 2rem;
    display: flex;
    justify-content: center;
    gap: 2rem;
}

.footer-links a {
    color: var(--text-main);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

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

@media (max-width: 768px) {
    .nav-buttons .btn-outline { display: none; }
    h1.hero-title { font-size: 2.5rem; }
    .hero-actions { flex-direction: column; }
}