@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700&family=Noto+Sans+JP:wght@400;500;700&display=swap');

:root {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-primary: #6366f1;
    --accent-secondary: #8b5cf6;
    --border-color: #334155;
    --glass-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
}

* {
    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-primary);
    line-height: 1.7;
    overflow-x: hidden;
}

/* Background Gradients */
.bg-blobs {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

.blob {
    position: absolute;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, var(--accent-primary) 0%, transparent 70%);
    filter: blur(80px);
    opacity: 0.15;
    border-radius: 50%;
    animation: move 20s infinite alternate;
}

.blob-1 {
    top: -100px;
    right: -100px;
}

.blob-2 {
    bottom: -100px;
    left: -100px;
    background: radial-gradient(circle, var(--accent-secondary) 0%, transparent 70%);
    animation-delay: -5s;
}

@keyframes move {
    from { transform: translate(0, 0); }
    to { transform: translate(50px, 50px); }
}

/* Layout */
.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

header {
    margin-bottom: 4rem;
    text-align: center;
    padding: 4rem 1rem;
}

.app-logo {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    margin: 0 auto 1.5rem;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 10px 25px -5px rgba(99, 102, 241, 0.4);
}

.app-logo::after {
    content: '-';
    color: white;
    font-size: 40px;
    font-weight: bold;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    background: linear-gradient(to right, #fff, #cbd5e1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.last-updated {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Navigation / TOC */
.toc {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    padding: 2rem;
    border-radius: 24px;
    margin-bottom: 3rem;
    position: sticky;
    top: 20px;
    max-height: calc(100vh - 40px);
    overflow-y: auto;
    display: none; /* Hidden on small screens, shown in grid on large */
}

@media (min-width: 1200px) {
    .main-grid {
        display: grid;
        grid-template-columns: 300px 1fr;
        gap: 3rem;
        align-items: flex-start;
    }
    .toc {
        display: block;
    }
}

.toc h2 {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.toc ul {
    list-style: none;
}

.toc li {
    margin-bottom: 0.5rem;
}

.toc a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    transition: color 0.2s;
}

.toc a:hover {
    color: var(--accent-primary);
}

/* Content */
.content-wrapper {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    padding: 3rem;
    border-radius: 24px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

@media (max-width: 640px) {
    .content-wrapper {
        padding: 1.5rem;
    }
}

section {
    margin-bottom: 2.5rem;
}

h2 {
    font-size: 1.5rem;
    margin-bottom: 1.25rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border-color);
    color: var(--text-primary);
}

h3 {
    font-size: 1.2rem;
    margin: 1.5rem 0 0.75rem;
    color: var(--accent-primary);
}

p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

ul {
    margin-bottom: 1rem;
    padding-left: 1.5rem;
    color: var(--text-secondary);
}

li {
    margin-bottom: 0.5rem;
}

strong {
    color: var(--text-primary);
}

.placeholder {
    background-color: rgba(99, 102, 241, 0.1);
    border: 1px dashed var(--accent-primary);
    padding: 2px 4px;
    border-radius: 4px;
    color: var(--accent-primary);
    font-weight: 500;
}

/* Footer */
footer {
    text-align: center;
    margin-top: 4rem;
    padding: 4rem 1rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.contact-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 24px;
    margin-bottom: 2rem;
    display: inline-block;
    min-width: 300px;
}

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

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