:root {
    --color-bg: #fafafa;
    --color-ink: #1a1a1a;
    --color-ink-sub: #888888;
    --color-accent: #ff4500;
    --color-accent-light: rgba(255, 69, 0, 0.15);
    --color-border: rgba(0, 0, 0, 0.08);
    --font-sans: 'Noto Sans JP', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

body {
    background-color: var(--color-bg);
    color: var(--color-ink);
    font-family: var(--font-sans);
    line-height: 1.8;
    letter-spacing: 0.02em;
    -webkit-font-smoothing: antialiased;
}

.font-mono {
    font-family: var(--font-mono);
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-fadeIn {
    animation: fadeIn 0.8s cubic-bezier(0.2, 0.8, 0.2, 1) forwards;
    opacity: 0;
}

.delay-100 {
    animation-delay: 0.1s;
}

.delay-200 {
    animation-delay: 0.2s;
}

.delay-300 {
    animation-delay: 0.3s;
}

.delay-400 {
    animation-delay: 0.4s;
}

.delay-500 {
    animation-delay: 0.5s;
}

/* Glassmorphism */
.glass {
    background: rgba(255, 255, 255, 0.4);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
}

/* Custom Components */
.btn-premium {
    background: white;
    border: 1px solid var(--color-border);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.02);
}

.btn-premium:hover {
    border-color: var(--color-accent);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(255, 69, 0, 0.1);
    color: var(--color-accent);
}

/* Logo accent */
.logo span {
    color: var(--color-accent);
}