/* ───── Tokens: NIGHT (default) ───── */
:root {
  --bg: #07080d;
  --panel: #0d0f18;
  --panel-2: #121524;
  --ink: #e6ebf5;
  --muted: #9aa3b8;
  --line: #262b3d;
  --acid: #e8ff2a;
  --cyan: #2ee6ff;
  --pink: #ff3d8f;
  --on-acid: #07080d;
  --hot-text: var(--acid);          /* accent used as text */
  --read: var(--cyan);
  --code-bg: #04050a;
  --code-ink: #d7f7ff;
  --glow-acid: 0 0 6px rgba(232, 255, 42, .55), 0 0 22px rgba(232, 255, 42, .35);
  --glow-cyan: 0 0 0 1px rgba(46, 230, 255, .35), 0 0 30px -6px rgba(46, 230, 255, .45);
  --grid: rgba(46, 230, 255, .22);
  --scan: rgba(255, 255, 255, .025);
  --cut: 14px;
  --display: "Big Shoulders Display", Impact, "Arial Narrow", sans-serif;
  --body: "Chakra Petch", "Segoe UI", sans-serif;
  --mono: "Martian Mono", ui-monospace, Consolas, monospace;
  color-scheme: dark;
}
/* ───── Tokens: DAY (raw concrete) ───── */
:root[data-theme="light"] {
  --bg: #e7e9e1;
  --panel: #f6f7f1;
  --panel-2: #eef0e8;
  --ink: #0a0b10;
  --muted: #3d4254;
  --line: #0a0b10;
  --cyan: #00697d;
  --pink: #b8005a;
  --hot-text: #0a0b10;
  --read: #00697d;
  --glow-acid: none;
  --glow-cyan: 6px 6px 0 #0a0b10;
  --grid: rgba(10, 11, 16, .16);
  --scan: transparent;
  color-scheme: light;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 400 1.03rem/1.62 var(--body); -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: var(--cyan); text-underline-offset: 3px; }
code, pre { font-family: var(--mono); font-size: .86em; }
b, strong { font-weight: 600; }
::selection { background: var(--acid); color: var(--on-acid); }
:focus-visible { outline: 2px solid var(--acid); outline-offset: 3px; }
:root[data-theme="light"] :focus-visible { outline-color: var(--ink); }
.wrap { width: min(1180px, 100% - 32px); margin-inline: auto; }
.skip { position: absolute; left: -999px; top: 8px; z-index: 20; background: var(--acid); color: var(--on-acid); padding: 12px 16px; font-weight: 600; }
.skip:focus { left: 16px; }

/* Film grain over everything */
.grain {
  position: fixed; inset: -50%; z-index: 30; pointer-events: none; opacity: .07;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  animation: grain 1.2s steps(6) infinite;
}
:root[data-theme="light"] .grain { opacity: .05; }
@keyframes grain { 0% { transform: translate(0, 0); } 33% { transform: translate(-3%, 2%); } 66% { transform: translate(2%, -3%); } 100% { transform: translate(0, 0); } }

/* Cut-corner panels: clip + a 1px diagonal on two corners */
.cutbox { position: relative; border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut))); }
.cutbox::before, .cutbox::after { content: ""; position: absolute; width: calc(var(--cut) * 1.42); height: 1px; background: var(--line); }
.cutbox::before { top: 0; right: 0; transform-origin: right top; transform: translate(0, 0) rotate(45deg) translateX(1px); }
.cutbox::after { bottom: 0; left: 0; transform-origin: left bottom; transform: rotate(45deg) translateX(-1px); }

/* ───── Header ───── */
.top { position: sticky; top: 0; z-index: 10; background: color-mix(in srgb, var(--bg) 82%, transparent); backdrop-filter: blur(12px); border-bottom: 1px solid var(--line); }
.top-row { display: flex; align-items: center; gap: 14px; height: 68px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; min-height: 44px; }
.mark { width: 26px; height: 26px; fill: var(--acid); filter: drop-shadow(0 0 6px rgba(232, 255, 42, .7)); }
:root[data-theme="light"] .mark { fill: var(--ink); filter: none; }
.neon { font: 900 1.9rem/1 var(--display); letter-spacing: .06em; color: var(--acid); text-shadow: var(--glow-acid); animation: flicker 2.4s linear 1 both; }
:root[data-theme="light"] .neon { color: var(--ink); }
.brand-tag { font: 500 .62rem/1 var(--mono); color: var(--muted); border: 1px solid var(--line); padding: 4px 6px; letter-spacing: .08em; }
@keyframes flicker {
  0%, 9%, 13%, 22%, 26% { opacity: .15; text-shadow: none; }
  10%, 12%, 23%, 25%, 100% { opacity: 1; text-shadow: var(--glow-acid); }
}
.nav { display: flex; gap: 2px; margin-left: auto; }
.nav a { display: inline-flex; align-items: center; min-height: 44px; color: var(--ink); text-decoration: none; padding: 0 12px; font: 500 .8rem/1 var(--mono); text-transform: uppercase; letter-spacing: .06em; }
.nav a:hover { color: var(--on-acid); background: var(--acid); }
.nav .gh span { animation: blink 1s steps(1) infinite; }
.theme { min-width: 76px; height: 44px; border: 1px solid var(--line); background: var(--panel); color: var(--ink); cursor: pointer; font: 500 .72rem/1 var(--mono); text-transform: uppercase; letter-spacing: .1em; display: grid; place-items: center; }
.theme:hover { border-color: var(--acid); }
.theme .theme-day { display: none; }
:root[data-theme="light"] .theme .theme-day { display: inline; }
:root[data-theme="light"] .theme .theme-night { display: none; }
.theme span::before { content: "◐ "; color: var(--acid); }
:root[data-theme="light"] .theme span::before { color: var(--ink); }

/* ───── Hero ───── */
.hero { position: relative; overflow: hidden; padding: 64px 0 96px; border-bottom: 1px solid var(--line); isolation: isolate; }
.floor {
  position: absolute; left: -25%; right: -25%; bottom: -10%; height: 62%; z-index: -1;
  background-image: linear-gradient(var(--grid) 1px, transparent 1px), linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 64px 64px;
  transform: perspective(520px) rotateX(64deg); transform-origin: center top;
  mask-image: linear-gradient(to bottom, transparent 0%, #000 35%, #000 70%, transparent 100%);
  animation: drive 3.5s linear infinite;
}
@keyframes drive { to { background-position: 0 64px; } }
.hero::before { /* horizon glow */
  content: ""; position: absolute; left: 0; right: 0; top: 34%; height: 260px; z-index: -1;
  background: radial-gradient(60% 50% at 70% 50%, rgba(255, 61, 143, .22), transparent 70%), radial-gradient(40% 40% at 20% 60%, rgba(46, 230, 255, .14), transparent 70%);
}
:root[data-theme="light"] .hero::before { background: none; }
.kana { position: absolute; right: 18px; top: 40px; z-index: -1; writing-mode: vertical-rl; font: 900 9rem/1 var(--display), "Yu Gothic", "Meiryo", sans-serif; color: transparent; -webkit-text-stroke: 1px var(--line); letter-spacing: .05em; user-select: none; }
.hero-grid { display: grid; grid-template-columns: 1.08fr .92fr; gap: 48px; align-items: center; }
.eyebrow { display: block; font: 500 .72rem/1.4 var(--mono); text-transform: uppercase; letter-spacing: .1em; color: var(--muted); margin: 0 0 22px; }
.eyebrow b { color: var(--acid); font-weight: 500; }
:root[data-theme="light"] .eyebrow b { color: var(--pink); }
.pulse { display: inline-block; width: 8px; height: 8px; margin-right: 10px; vertical-align: 1px; background: var(--acid); box-shadow: var(--glow-acid); animation: blink 1.4s steps(1) infinite; }
.eyebrow b { white-space: nowrap; }
:root[data-theme="light"] .pulse { background: var(--pink); }
@keyframes blink { 50% { opacity: 0; } }

h1, h2, h3 { font-family: var(--display); font-weight: 900; text-transform: uppercase; letter-spacing: .01em; margin: 0; line-height: .9; }
h1 { font-size: clamp(3.6rem, 9.5vw, 8.2rem); }
h1 .line { display: block; animation: rise .5s cubic-bezier(.2, .7, .2, 1) both; }
h1 .line:nth-child(2) { animation-delay: .07s; }
h1 .line:nth-child(3) { animation-delay: .14s; }
h1 .line:nth-child(4) { animation-delay: .21s; display: inline-block; }
@keyframes rise { from { opacity: 0; transform: translateY(18px); } to { opacity: 1; transform: none; } }
.hot { color: var(--acid); text-shadow: var(--glow-acid); }
:root[data-theme="light"] .hot { color: var(--ink); background: var(--acid); padding: 0 .12em; box-decoration-break: clone; }
.glitch { animation: rise .5s .21s cubic-bezier(.2, .7, .2, 1) both, glitch 5s 1.2s steps(1) infinite; }
@keyframes glitch {
  0%, 91%, 100% { transform: none; filter: none; }
  92% { transform: translate(-3px, 1px) skewX(-6deg); text-shadow: 3px 0 var(--pink), -3px 0 var(--cyan); }
  94% { transform: translate(3px, -1px); text-shadow: -4px 0 var(--pink), 4px 0 var(--cyan); clip-path: inset(30% 0 22% 0); }
  96% { transform: translate(-1px, 0); text-shadow: 2px 0 var(--cyan), -2px 0 var(--pink); clip-path: none; }
}
.caret { font: 900 clamp(3.6rem, 9.5vw, 8.2rem)/.9 var(--display); color: var(--pink); animation: blink 1s steps(1) infinite; margin-left: .04em; }
.lede { font-size: 1.12rem; color: var(--muted); margin: 26px 0 28px; max-width: 34em; }
.lede, .note { text-wrap: pretty; }

.cmd { display: flex; align-items: center; justify-content: space-between; gap: 12px; max-width: 430px; background: var(--code-bg); color: var(--code-ink); padding: 6px 6px 6px 18px; border-left: 3px solid var(--acid); }
:root[data-theme="light"] .cmd { border-left-color: var(--pink); box-shadow: 6px 6px 0 var(--ink); }
.cmd code { font-size: .92rem; white-space: nowrap; overflow-x: auto; }
.prompt { color: var(--acid); margin-right: 8px; user-select: none; }
.copy { font: 500 .72rem/1 var(--mono); text-transform: uppercase; letter-spacing: .08em; border: 1px solid color-mix(in srgb, var(--code-ink) 30%, transparent); background: transparent; color: var(--code-ink); padding: 0 14px; min-height: 44px; min-width: 78px; cursor: pointer; }
.copy:hover { border-color: var(--acid); color: var(--acid); }
.copy.done { background: var(--acid); color: var(--on-acid); border-color: var(--acid); }
.cta { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 22px; }
.btn { display: inline-flex; align-items: center; gap: 10px; min-height: 50px; padding: 0 24px; text-decoration: none; font: 600 .95rem/1 var(--body); text-transform: uppercase; letter-spacing: .06em; transition: transform .12s, box-shadow .12s, background-color .12s; }
.btn.primary { background: var(--acid); color: var(--on-acid); clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 12px 100%, 0 calc(100% - 12px)); }
.btn.primary:hover { transform: translate(-2px, -2px); box-shadow: 4px 4px 0 var(--pink); }
.btn.ghost { color: var(--cyan); border: 1px solid var(--cyan); }
.btn.ghost:hover { background: var(--cyan); color: var(--bg); }
:root[data-theme="light"] .btn.ghost:hover { color: #fff; }
.note { font-size: .92rem; color: var(--muted); margin-top: 18px; max-width: 34em; }
.note b { color: var(--ink); }

/* HUD chat panel */
.hud { position: relative; margin: 0; background: color-mix(in srgb, var(--panel) 92%, transparent); border: 1px solid var(--cyan); box-shadow: var(--glow-cyan);
  transform: perspective(1400px) rotateY(-7deg) rotateX(2deg); transition: transform .3s; }
.hud:hover { transform: none; }
:root[data-theme="light"] .hud { border-color: var(--ink); }
.hud::before { content: ""; position: absolute; inset: 0; pointer-events: none; background: repeating-linear-gradient(0deg, var(--scan) 0 1px, transparent 1px 3px); }
.hud-bar { display: flex; align-items: center; gap: 12px; padding: 12px 16px; border-bottom: 1px solid var(--line); font: 500 .66rem/1 var(--mono); text-transform: uppercase; letter-spacing: .08em; color: var(--muted); }
.signal { display: inline-flex; align-items: flex-end; gap: 2px; height: 12px; margin-left: auto; }
.signal i { width: 3px; background: var(--acid); }
:root[data-theme="light"] .signal i { background: var(--ink); }
.signal i:nth-child(1) { height: 4px; } .signal i:nth-child(2) { height: 7px; } .signal i:nth-child(3) { height: 10px; } .signal i:nth-child(4) { height: 12px; animation: blink 2s steps(1) infinite; }
.ok-text { color: var(--acid); }
:root[data-theme="light"] .ok-text { color: var(--pink); }
.corner { position: absolute; width: 18px; height: 18px; border: 2px solid var(--acid); }
:root[data-theme="light"] .corner { border-color: var(--pink); }
.corner.tl { top: -7px; left: -7px; border-right: 0; border-bottom: 0; }
.corner.br { bottom: -7px; right: -7px; border-left: 0; border-top: 0; }
.chat-log { list-style: none; margin: 0; padding: 18px; display: flex; flex-direction: column; gap: 10px; min-height: 470px; }
.chat-log li { transition: opacity .16s ease, transform .16s ease; }
.chat-log.playing li { opacity: 0; transform: translateX(-6px); }
.chat-log.playing li.on { opacity: 1; transform: none; }
.msg { max-width: 88%; padding: 10px 14px; font-size: .94rem; line-height: 1.45; }
.msg.user { align-self: flex-end; background: var(--acid); color: var(--on-acid); clip-path: polygon(0 0, 100% 0, 100% 100%, 10px 100%, 0 calc(100% - 10px)); }
.msg.bot { align-self: flex-start; background: var(--panel-2); border: 1px solid var(--line); border-left: 2px solid var(--cyan); }
.msg.bot b { color: var(--hot-text); }
.msg.ok { border-left-color: var(--pink); }
.tools { display: flex; flex-wrap: wrap; gap: 6px; }
.tools span { font: 500 .66rem/1 var(--mono); padding: 6px 8px; border: 1px solid currentColor; }
.tools .r { color: var(--read); }
.tools .w { color: var(--acid); }
:root[data-theme="light"] .tools .w { color: var(--ink); background: var(--acid); border-color: var(--ink); }
.tools span::before { content: "▸ "; }

/* ───── Ticker ───── */
.ticker { overflow: hidden; background: var(--acid); color: var(--on-acid); border-block: 2px solid var(--on-acid); }
.ticker-track { display: flex; width: max-content; animation: marquee 32s linear infinite; }
.ticker-track span { font: 700 1.25rem/1 var(--display); text-transform: uppercase; letter-spacing: .08em; padding: 14px 22px; white-space: nowrap; }
.ticker-track span::after { content: "///"; margin-left: 44px; color: var(--pink); }
:root[data-theme="light"] .ticker-track span::after { color: #b8005a; }
@keyframes marquee { to { transform: translateX(-50%); } }

/* ───── Sections ───── */
.section { padding: 96px 0 0; }
.idx { font: 500 .78rem/1 var(--mono); color: var(--pink); margin: 0 0 10px; letter-spacing: .1em; }
h2 { font-size: clamp(2.8rem, 6.4vw, 5rem); }
.section-lede { color: var(--muted); max-width: 42em; margin: 16px 0 26px; font-size: 1.06rem; }
.legend { list-style: none; padding: 0; margin: 0 0 26px; display: flex; flex-wrap: wrap; gap: 10px 22px; font-size: .9rem; color: var(--muted); }
.legend li { display: flex; align-items: center; gap: 8px; }
.t { font: 500 .6rem/1 var(--mono); text-transform: uppercase; letter-spacing: .08em; padding: 4px 6px; border: 1px solid currentColor; flex: none; }
.t.r { color: var(--read); }
.t.w { color: var(--acid); }
.t.d { color: var(--on-acid); background: var(--pink); border-color: var(--pink); }
:root[data-theme="light"] .t.d { color: #fff; }
:root[data-theme="light"] .t.w { color: var(--ink); background: var(--acid); border-color: var(--ink); }

.sheet { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.mod { background: var(--panel); padding: 22px 22px 18px; transition: transform .15s, border-color .15s; }
.mod:hover { transform: translateY(-3px); border-color: var(--acid); }
:root[data-theme="light"] .mod:hover { border-color: var(--pink); }
.mod header { display: flex; align-items: baseline; justify-content: space-between; gap: 10px; padding-bottom: 12px; margin-bottom: 14px; border-bottom: 1px dashed var(--line); }
.num { font: 500 .66rem/1 var(--mono); color: var(--muted); letter-spacing: .08em; order: 2; }
.mod h3 { font-size: 1.75rem; line-height: 1; }
.mod ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; }
.mod li { display: grid; grid-template-columns: auto 1fr; column-gap: 10px; row-gap: 2px; align-items: center; }
.mod li code { font-size: .8rem; font-weight: 500; color: var(--ink); overflow-wrap: anywhere; }
.mod li > span:last-child { grid-column: 2; font-size: .88rem; color: var(--muted); }
.mod-note { margin: 14px 0 0; font: 400 .78rem/1.5 var(--mono); color: var(--muted); }

.sequence { list-style: none; padding: 0; margin: 34px 0 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; position: relative; }
.sequence li { position: relative; padding: 26px 26px 6px 0; border-top: 2px dashed var(--line); }
.sequence li::before { content: ""; position: absolute; top: -7px; left: 0; width: 12px; height: 12px; background: var(--bg); border: 2px solid var(--cyan); }
.sequence li.live { border-top: 2px solid var(--pink); }
.sequence li.live::before { background: var(--pink); border-color: var(--pink); box-shadow: 0 0 16px var(--pink); }
.step { display: block; font: 900 4.4rem/.8 var(--display); color: transparent; -webkit-text-stroke: 1px var(--muted); margin-bottom: 12px; }
.sequence li.live .step { -webkit-text-stroke-color: var(--pink); }
.sequence h3 { font-size: 2rem; margin-bottom: 8px; }
.sequence p { color: var(--muted); margin: 0; max-width: 24em; }
.sequence code { color: var(--ink); }

/* Tabs */
.tabs { background: var(--panel); }
.tablist { display: flex; overflow-x: auto; border-bottom: 1px solid var(--line); }
.tablist button { flex: 1 0 auto; min-height: 54px; padding: 0 22px; border: 0; background: transparent; color: var(--muted); font: 500 .76rem/1 var(--mono); text-transform: uppercase; letter-spacing: .08em; cursor: pointer; border-bottom: 3px solid transparent; }
.tablist button:hover { color: var(--ink); }
.tablist button[aria-selected="true"] { color: var(--ink); border-bottom-color: var(--acid); background: var(--panel-2); }
:root[data-theme="light"] .tablist button[aria-selected="true"] { border-bottom-color: var(--pink); }
.tablist button[aria-selected="true"]::before { content: "● "; color: var(--acid); }
:root[data-theme="light"] .tablist button[aria-selected="true"]::before { color: var(--pink); }
.panel { padding: 22px; }
.panel > p { margin: 0 0 14px; color: var(--muted); }
.code { position: relative; background: var(--code-bg); color: var(--code-ink); border: 1px solid var(--line); }
.code::before { content: ""; position: absolute; inset: 0; pointer-events: none; background: repeating-linear-gradient(0deg, rgba(255, 255, 255, .025) 0 1px, transparent 1px 3px); }
.code pre { margin: 0; padding: 20px; overflow-x: auto; font-size: .82rem; line-height: 1.6; }
.code .copy { position: absolute; top: 10px; right: 10px; z-index: 1; background: var(--code-bg); }
.hint { color: var(--muted); font-size: .95rem; margin-top: 16px; }
.hint q { font-style: normal; color: var(--ink); }
.hint q::before, .hint q::after { color: var(--pink); }

.steps { list-style: none; padding: 0; margin: 28px 0; display: grid; gap: 16px; max-width: 48em; counter-reset: s; }
/* Plain text flow: a grid here would turn every link, bold word and code snippet into its own cell */
.steps li { counter-increment: s; position: relative; padding-left: 96px; line-height: 1.6; }
.steps li::before { content: "STEP_0" counter(s); position: absolute; left: 0; top: .4em; font: 500 .7rem/1 var(--mono); color: var(--acid); letter-spacing: .06em; }
.steps code { color: var(--cyan); padding: 1px 5px; border: 1px solid var(--line); white-space: nowrap; }
:root[data-theme="light"] .steps li::before { color: var(--pink); }
.perms { display: flex; flex-wrap: wrap; gap: 8px; }
.perms span { font-size: .85rem; padding: 8px 12px; border: 1px solid var(--line); background: var(--panel); color: var(--muted); }
.perms code { color: var(--cyan); font-size: .76rem; }

.faq details { border-bottom: 1px solid var(--line); max-width: 54em; }
.faq details:first-of-type { margin-top: 24px; border-top: 1px solid var(--line); }
.faq summary { cursor: pointer; list-style: none; display: flex; align-items: center; gap: 14px; min-height: 60px; padding: 8px 0; font: 600 1.1rem/1.35 var(--body); }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::before { content: ">"; font-family: var(--mono); color: var(--pink); }
.faq summary::after { content: "[+]"; margin-left: auto; font: 500 .8rem/1 var(--mono); color: var(--muted); }
.faq details[open] summary::after { content: "[–]"; color: var(--acid); }
:root[data-theme="light"] .faq details[open] summary::after { color: var(--pink); }
.faq summary:hover { color: var(--cyan); }
.faq details p { margin: 0 0 20px 26px; color: var(--muted); max-width: 46em; }

.foot { margin-top: 110px; background: var(--panel); }
.hazard { height: 14px; background: repeating-linear-gradient(-45deg, var(--acid) 0 14px, var(--on-acid) 14px 28px); }
.foot-row { display: flex; align-items: center; justify-content: space-between; gap: 18px; flex-wrap: wrap; padding: 28px 0; }
.foot p { margin: 0; color: var(--muted); font-size: .9rem; max-width: 42em; }

@media (max-width: 960px) {
  .hero-grid { grid-template-columns: 1fr; gap: 56px; }
  .hud { transform: none; }
  .sheet { grid-template-columns: repeat(2, 1fr); }
  .sequence { grid-template-columns: 1fr; gap: 28px; }
  .nav a:not(.gh) { display: none; }
  .kana { font-size: 6rem; opacity: .7; }
}
@media (max-width: 600px) {
  .sheet { grid-template-columns: 1fr; }
  .chat-log { min-height: 0; }
  .brand-tag { display: none; }
  .kana { display: none; }
  .section { padding-top: 72px; }
  .steps li { padding-left: 0; padding-top: 20px; }
  .steps li::before { top: 0; }
  .hero { padding-top: 44px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
  .neon { opacity: 1; }
}