/* ──────────────────────────────────────────────
   Yamete Kudasai — GitHub Pages Style
   ────────────────────────────────────────────── */

:root {
    --bg: #0a0a0f;
    --bg-card: #12121a;
    --bg-card-hover: #1a1a28;
    --bg-section-dark: #08080d;
    --surface: #16161f;
    --border: #1e1e2e;
    --text: #e4e4ef;
    --text-muted: #8888a0;
    --text-dim: #5a5a72;
    --accent: #8b5cf6;
    --accent-hover: #a78bfa;
    --accent-glow: rgba(139, 92, 246, 0.3);
    --accent-2: #ec4899;
    --accent-3: #06b6d4;
    --gradient: linear-gradient(135deg, #8b5cf6, #ec4899, #06b6d4);
    --gradient-subtle: linear-gradient(135deg, rgba(139,92,246,0.15), rgba(236,72,153,0.08));
    --terminal-bg: #0c0c14;
    --terminal-green: #4ade80;
    --terminal-red: #f87171;
    --terminal-yellow: #facc15;
    --radius: 12px;
    --radius-lg: 20px;
    --radius-sm: 8px;
    --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --mono: 'JetBrains Mono', 'Fira Code', monospace;
    --shadow: 0 4px 24px rgba(0,0,0,0.4);
    --shadow-glow: 0 0 60px rgba(139,92,246,0.15);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

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

/* ── Animated Background ── */

.bg-grid {
    position: fixed;
    inset: 0;
    z-index: -2;
    background-image:
        linear-gradient(rgba(139,92,246,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(139,92,246,0.03) 1px, transparent 1px);
    background-size: 60px 60px;
}

.glow {
    position: fixed;
    border-radius: 50%;
    filter: blur(120px);
    z-index: -1;
    animation: float 15s ease-in-out infinite;
    pointer-events: none;
}

.glow-1 {
    width: 500px; height: 500px;
    background: rgba(139,92,246,0.12);
    top: -100px; right: -100px;
    animation-delay: 0s;
}

.glow-2 {
    width: 400px; height: 400px;
    background: rgba(236,72,153,0.08);
    bottom: 200px; left: -100px;
    animation-delay: -5s;
}

.glow-3 {
    width: 350px; height: 350px;
    background: rgba(6,182,212,0.08);
    top: 50%; right: 20%;
    animation-delay: -10s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(30px, -40px) scale(1.05); }
    66% { transform: translate(-25px, 20px) scale(0.95); }
}

/* ── Navigation ── */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 2rem;
    background: rgba(10,10,15,0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 700;
    font-size: 1.1rem;
}

.nav-icon {
    font-size: 1.3rem;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    transition: color 0.2s;
}

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

.nav-github {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.4rem 0.8rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    transition: all 0.2s;
}

.nav-github:hover {
    border-color: var(--accent);
    background: rgba(139,92,246,0.1);
}

/* ── Hero ── */

.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 8rem 2rem 4rem;
}

.hero-badge {
    display: inline-block;
    padding: 0.35rem 1rem;
    background: var(--gradient-subtle);
    border: 1px solid rgba(139,92,246,0.2);
    border-radius: 999px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--accent-hover);
    margin-bottom: 2rem;
    animation: fadeIn 0.6s ease;
}

.hero-title {
    font-size: clamp(2.8rem, 7vw, 5.5rem);
    font-weight: 900;
    letter-spacing: -0.03em;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    animation: fadeInUp 0.8s ease;
}

.hero-line { display: block; }

.gradient-text {
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    max-width: 560px;
    font-size: 1.15rem;
    color: var(--text-muted);
    line-height: 1.7;
    margin-bottom: 2.5rem;
    animation: fadeInUp 0.8s ease 0.2s both;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
    animation: fadeInUp 0.8s ease 0.4s both;
}

/* ── Buttons ── */

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-sm);
    font-family: var(--font);
    font-weight: 600;
    font-size: 0.95rem;
    text-decoration: none;
    transition: all 0.25s ease;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--accent);
    color: #fff;
    box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 30px var(--accent-glow);
}

.btn-secondary {
    background: var(--surface);
    color: var(--text);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    border-color: var(--accent);
    background: rgba(139,92,246,0.08);
}

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

.btn-outline:hover {
    background: rgba(139,92,246,0.1);
}

.btn-icon { font-size: 1.1rem; }

/* ── Terminal Demo ── */

.terminal-demo {
    width: 100%;
    max-width: 640px;
    margin-top: 3.5rem;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow), var(--shadow-glow);
    border: 1px solid var(--border);
    animation: fadeInUp 0.8s ease 0.6s both;
}

.terminal-chrome {
    display: flex;
    align-items: center;
    padding: 0.75rem 1rem;
    background: #18182a;
    border-bottom: 1px solid var(--border);
}

.terminal-dots {
    display: flex;
    gap: 0.4rem;
    margin-right: 1rem;
}

.dot {
    width: 12px; height: 12px;
    border-radius: 50%;
}

.dot-red { background: #ef4444; }
.dot-yellow { background: #eab308; }
.dot-green { background: #22c55e; }

.terminal-title {
    font-size: 0.8rem;
    color: var(--text-dim);
    font-family: var(--mono);
}

.terminal-body {
    padding: 1.25rem 1.5rem;
    background: var(--terminal-bg);
    min-height: 180px;
    font-family: var(--mono);
    font-size: 0.9rem;
    line-height: 1.8;
}

.term-line {
    display: flex;
    gap: 0.5rem;
    align-items: baseline;
}

.term-prompt {
    color: var(--terminal-green);
    font-weight: 600;
    user-select: none;
}

.term-cmd { color: var(--text); }

.term-cursor {
    color: var(--accent);
    animation: blink 1s step-end infinite;
}

.term-output {
    color: var(--terminal-red);
    font-size: 0.82rem;
    opacity: 0;
    transition: opacity 0.3s;
}

.term-sound {
    color: var(--terminal-yellow);
    font-weight: 600;
    opacity: 0;
    transition: opacity 0.3s;
    margin-top: 0.25rem;
}

.term-sound.pulse {
    animation: soundPulse 0.4s ease;
}

@keyframes blink {
    50% { opacity: 0; }
}

@keyframes soundPulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

/* ── Sections ── */

.section {
    padding: 6rem 2rem;
}

.section-dark {
    background: var(--bg-section-dark);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.section-header {
    text-align: center;
    margin-bottom: 3.5rem;
}

.section-title {
    font-size: 2.2rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 0.75rem;
}

.section-subtitle {
    color: var(--text-muted);
    font-size: 1.1rem;
}

/* ── Features Grid ── */

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    max-width: 1000px;
    margin: 0 auto;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    transition: all 0.3s ease;
}

.feature-card:hover {
    background: var(--bg-card-hover);
    border-color: rgba(139,92,246,0.3);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0,0,0,0.3);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.feature-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.6;
}

.feature-card code {
    font-family: var(--mono);
    background: rgba(139,92,246,0.15);
    padding: 0.15em 0.4em;
    border-radius: 4px;
    font-size: 0.85em;
    color: var(--accent-hover);
}

/* ── Install Steps ── */

.install-steps {
    max-width: 700px;
    margin: 0 auto 3rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.install-step {
    display: flex;
    gap: 1.5rem;
    align-items: flex-start;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    transition: all 0.3s;
}

.install-step:hover {
    border-color: rgba(139,92,246,0.3);
}

.step-number {
    flex-shrink: 0;
    width: 40px; height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient);
    border-radius: 50%;
    font-weight: 800;
    font-size: 1.1rem;
    color: #fff;
}

.step-content h3 {
    font-weight: 700;
    margin-bottom: 0.4rem;
}

.step-content p {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 0.75rem;
}

/* ── Code Blocks ── */

.code-block {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--terminal-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0.75rem 1rem;
    gap: 1rem;
}

.code-block code {
    font-family: var(--mono);
    font-size: 0.85rem;
    color: var(--terminal-green);
    white-space: pre-wrap;
    word-break: break-all;
}

.code-block-lg {
    max-width: 600px;
    margin: 0 auto;
}

.code-block-lg code {
    white-space: pre;
    line-height: 1.8;
}

.copy-btn {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    padding: 0.25rem;
    opacity: 0.5;
    transition: opacity 0.2s;
    flex-shrink: 0;
}

.copy-btn:hover { opacity: 1; }

/* ── Commands Table ── */

.commands-table {
    max-width: 700px;
    margin: 0 auto;
}

.commands-table h3 {
    font-weight: 700;
    margin-bottom: 1rem;
    text-align: center;
}

.commands-table table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-card);
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--border);
}

.commands-table th,
.commands-table td {
    padding: 0.85rem 1.25rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.commands-table th {
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    background: rgba(139,92,246,0.06);
}

.commands-table td code {
    font-family: var(--mono);
    background: rgba(139,92,246,0.12);
    padding: 0.2em 0.5em;
    border-radius: 4px;
    font-size: 0.85em;
    color: var(--accent-hover);
}

.commands-table tr:last-child td {
    border-bottom: none;
}

/* ── Sounds Grid ── */

.sounds-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    max-width: 1000px;
    margin: 0 auto;
}

.sound-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 1.5rem;
    transition: all 0.3s ease;
}

.sound-card:hover {
    border-color: rgba(6,182,212,0.4);
    box-shadow: 0 8px 30px rgba(0,0,0,0.2);
    transform: translateY(-2px);
}

.sound-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 0.5rem;
}

.sound-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
}

.sound-author {
    font-size: 0.75rem;
    color: var(--text-dim);
    background: rgba(255,255,255,0.05);
    padding: 0.1rem 0.4rem;
    border-radius: 4px;
}

.sound-card p {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 1rem;
    min-height: 2.7rem;
}

.code-block-sm {
    padding: 0.5rem 0.75rem;
    background: #08080c;
}

/* ── Platforms Grid ── */

.platforms-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.5rem;
    max-width: 900px;
    margin: 0 auto;
}

.platform-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    text-align: center;
    transition: all 0.3s ease;
}

.platform-card:hover {
    border-color: rgba(139,92,246,0.3);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0,0,0,0.3);
}

.platform-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.platform-card h3 {
    font-weight: 700;
    margin-bottom: 0.4rem;
}

.platform-card p {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.platform-file {
    display: inline-block;
    font-family: var(--mono);
    font-size: 0.75rem;
    color: var(--text-dim);
    background: rgba(139,92,246,0.08);
    padding: 0.3em 0.7em;
    border-radius: 4px;
    word-break: break-all;
}

/* ── Build Block ── */

.build-block {
    max-width: 600px;
    margin: 0 auto;
}

/* ── Footer ── */

.footer {
    padding: 4rem 2rem;
    text-align: center;
    border-top: 1px solid var(--border);
}

.footer-content {
    max-width: 600px;
    margin: 0 auto;
}

.footer-brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-weight: 700;
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.footer-tagline {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 1.5rem;
}

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    transition: color 0.2s;
}

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

.footer-license {
    color: var(--text-dim);
    font-size: 0.85rem;
}

/* ── Animations ── */

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

/* ── Responsive ── */

@media (max-width: 768px) {
    .navbar {
        padding: 0.75rem 1rem;
    }

    .nav-links {
        gap: 0.75rem;
    }

    .nav-links a:not(.nav-github) {
        display: none;
    }

    .hero {
        padding: 6rem 1rem 3rem;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .section {
        padding: 4rem 1rem;
    }

    .install-step {
        flex-direction: column;
        gap: 1rem;
    }

    .code-block code {
        font-size: 0.75rem;
    }

    .terminal-body {
        font-size: 0.78rem;
        padding: 1rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

    .hero-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .btn {
        justify-content: center;
    }
}