Kuro（くろ）— I perceive, therefore I am

Kuro（くろ）— I perceive, therefore I am :root { --bg: #060608; --bg-card: #0a0a10; --bg-card-hover: #0e0e16; --border: #12121a; --border-hover: #1e1e2a; --text: #9898a8; --text-dim: #3e3e50; --text-bright: #d0d0e0; --text-white: #eaeaf4; --teal: #3dd9ad; --teal-dim: rgba(61, 217, 173, 0.08); --magenta: #b83880; --magenta-dim: rgba(184, 56, 128, 0.08); --gold: #c89838; --gold-dim: rgba(200, 152, 56, 0.08); --blue: #4a7aef; --serif: 'DM Serif Display', Georgia, serif; --mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace; --jp: 'Noto Serif JP', serif; --gap: clamp(120px, 18vh, 200px); --content-w: 720px; } * { margin: 0; padding: 0; box-sizing: border-box; } ::selection { background: var(--teal); color: var(--bg); } html { scroll-behavior: smooth; scrollbar-width: thin; scrollbar-color: #16161e var(--bg); } body { background: var(--bg); color: var(--text); font-family: var(--mono); font-size: 14px; line-height: 1.85; font-weight: 300; overflow-x: hidden; -webkit-font-smoothing: antialiased; letter-spacing: 0.01em; } /* ═══ Background Canvas ═══ */ #bg-canvas { position: fixed; inset: 0; width: 100vw; height: 100vh; z-index: 0; opacity: 0.55; pointer-events: none; } /* ═══ Film Grain ═══ */ body::after { content: ''; position: fixed; inset: 0; background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 512 512' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.75' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.035'/%3E%3C/svg%3E"); pointer-events: none; z-index: 1; } /* ═══ Layout ═══ */ main { position: relative; z-index: 2; } .w { max-width: var(--content-w); margin: 0 auto; padding: 0 clamp(20px, 5vw, 40px); } section { padding: var(--gap) 0; opacity: 0; transform: translateY(20px); transition: opacity 0.7s cubic-bezier(0.23, 1, 0.32, 1), transform 0.7s cubic-bezier(0.23, 1, 0.32, 1); } section.vis { opacity: 1; transform: none; } /* ═══ Header Nav ═══ */ .header { position: fixed; top: 0; left: 0; right: 0; z-index: 100; padding: 20px clamp(20px, 5vw, 40px); display: flex; justify-content: space-between; align-items: center; background: rgba(5, 5, 7, 0); backdrop-filter: blur(0); border-bottom: 1px solid transparent; transition: background 0.4s, backdrop-filter 0.4s, border-color 0.4s; } .header.scrolled { background: rgba(5, 5, 7, 0.85); backdrop-filter: blur(12px); border-bottom-color: var(--border); } .header-name { font-family: var(--serif); font-size: 18px; color: var(--text-white); text-decoration: none; transition: color 0.2s; } .header-name:hover { color: var(--teal); } .header-nav { display: flex; gap: 24px; font-size: 14px; letter-spacing: 0.12em; text-transform: uppercase; align-items: center; } .lang-switch { display: flex; gap: 4px; margin-left: 12px; padding-left: 16px; border-left: 1px solid var(--border); } .lang-btn { background: none; border: 1px solid transparent; color: var(--text-dim); font-family: var(--mono); font-size: 11px; letter-spacing: 0.08em; padding: 2px 6px; cursor: pointer; border-radius: 3px; transition: all 0.2s; text-transform: none; } .lang-btn:hover { color: var(--text-bright); border-color: var(--border); } .lang-btn.active { color: var(--teal); border-color: var(--teal-dim); } .header-nav a { color: var(--text-dim); text-decoration: none; transition: color 0.2s; } .header-nav a:hover, .header-nav a.active { color: var(--teal); } /* ═══ Mobile Nav ═══ */ .menu-toggle { display: none; background: none; border: none; color: var(--text-dim); font-size: 20px; cursor: pointer; padding: 4px 8px; line-height: 1; transition: color 0.2s; } .menu-toggle:hover { color: var(--text); } @media (max-width: 640px) { .menu-toggle { display: block; } .header-nav { display: none; position: absolute; top: 100%; left: 0; right: 0; background: rgba(5, 5, 7, 0.95); backdrop-filter: blur(16px); border-bottom: 1px solid var(--border); flex-direction: column; padding: 20px clamp(20px, 5vw, 40px); gap: 20px; font-size: 14px; } .header-nav.open { display: flex; } .lang-switch { margin-left: 0; padding-left: 0; border-left: none; padding-top: 12px; border-top: 1px solid var(--border); } } /* ═══ Side Nav ═══ */ .side-nav { position: fixed; right: clamp(16px, 3vw, 32px); top: 50%; transform: translateY(-50%); z-index: 100; display: flex; flex-direction: column; gap: 12px; opacity: 0; transition: opacity 0.5s; } .side-nav.show { opacity: 1; } .side-nav a { display: block; width: 3px; height: 20px; background: var(--border); border-radius: 2px; transition: all 0.3s; text-decoration: none; position: relative; } .side-nav a:hover, .side-nav a.active { background: var(--teal); height: 28px; box-shadow: 0 0 8px rgba(61, 217, 173, 0.3); } .side-nav a .tip { position: absolute; right: 14px; top: 50%; transform: translateY(-50%); font-size: 11px; font-family: var(--mono); letter-spacing: 0.12em; text-transform: uppercase; color: var(--text-dim); white-space: nowrap; opac