/* GPU Goblin — the site's look: the application's palette (goblin green, teal), Inter, a dark and a
   light look (the system's, or the visitor's choice kept in localStorage by theme.js). */

@font-face { font-family: "Inter"; font-weight: 400; font-display: swap; src: url("../fonts/inter-regular.woff2") format("woff2"); }
@font-face { font-family: "Inter"; font-weight: 600; font-display: swap; src: url("../fonts/inter-semibold.woff2") format("woff2"); }
@font-face { font-family: "Inter"; font-weight: 700; font-display: swap; src: url("../fonts/inter-bold.woff2") format("woff2"); }

:root {
  --bg: #f3f4f7; --side: #ffffff; --card: #ffffff; --raised: #eef0f4; --border: #e2e5eb;
  --text: #111827; --muted: #5b6272; --accent: #16a34a; --accent2: #0891b2; --on-accent: #ffffff;
  --accent-soft: #dcf5e6; --warn: #b45309; --danger: #dc2626;
  --shadow: 0 1px 2px rgb(0 0 0 / .04), 0 8px 24px rgb(0 0 0 / .06);
  --radius: 16px; --wrap: 1120px;
  color-scheme: light;
}
:root[data-theme="dark"] {
  --bg: #121419; --side: #0b0d11; --card: #1b1e26; --raised: #252933; --border: #2c313c;
  --text: #eceef3; --muted: #9aa2b1; --accent: #3ddc84; --accent2: #2bc7d9; --on-accent: #061a10;
  --accent-soft: #173524; --warn: #f5a623; --danger: #f05555;
  --shadow: none;
  color-scheme: dark;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #121419; --side: #0b0d11; --card: #1b1e26; --raised: #252933; --border: #2c313c;
    --text: #eceef3; --muted: #9aa2b1; --accent: #3ddc84; --accent2: #2bc7d9; --on-accent: #061a10;
    --accent-soft: #173524; --warn: #f5a623; --danger: #f05555;
    --shadow: none;
    color-scheme: dark;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 400 17px/1.6 Inter, system-ui, -apple-system, "Segoe UI", "Noto Sans", "Noto Sans CJK SC",
    "Noto Sans Devanagari", "Noto Sans Bengali", sans-serif;
  -webkit-font-smoothing: antialiased; overflow-x: hidden;
}
img, svg { max-width: 100%; }
a { color: var(--accent); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
h1, h2, h3 { line-height: 1.2; margin: 0 0 .5em; letter-spacing: -.01em; }
h1 { font-size: clamp(2rem, 4.5vw, 3.3rem); font-weight: 700; }
h2 { font-size: clamp(1.45rem, 2.6vw, 2rem); font-weight: 700; }
h3 { font-size: 1.15rem; font-weight: 600; }
p { margin: 0 0 1em; }
.wrap { width: min(var(--wrap), 100% - 32px); margin-inline: auto; }
.narrow { max-width: 760px; margin-inline: auto; }
.center { text-align: center; }
.muted { color: var(--muted); }
.small { font-size: .9rem; }
.lead { font-size: 1.2rem; color: var(--muted); }
.skip { position: absolute; left: -999px; top: 8px; background: var(--accent); color: var(--on-accent); padding: 8px 14px; border-radius: 8px; z-index: 10; }
.skip:focus { left: 16px; }
:focus-visible { outline: 3px solid var(--accent2); outline-offset: 2px; border-radius: 6px; }

/* Header */
.top { position: sticky; top: 0; z-index: 5; background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(10px); border-bottom: 1px solid var(--border); }
.top-in { display: flex; align-items: center; gap: 20px; min-height: 64px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-weight: 700; font-size: 1.15rem; }
.nav { margin-left: auto; }
.nav-links { display: flex; align-items: center; gap: 4px; list-style: none; margin: 0; padding: 0; }
.nav-links a { display: block; padding: 8px 10px; border-radius: 10px; color: var(--muted); text-decoration: none; font-weight: 500; font-size: .95rem; }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--text); background: var(--raised); }
.nav-links .nav-account a { color: var(--on-accent); background: var(--accent); margin-left: 6px; }
.nav-toggle-box, .nav-toggle { display: none; }
.tools { display: flex; align-items: center; gap: 6px; }
.theme, .lang summary { display: inline-flex; align-items: center; gap: 6px; height: 38px; padding: 0 10px; border: 1px solid var(--border); border-radius: 10px; background: var(--card); color: var(--muted); cursor: pointer; font: 600 .8rem Inter, sans-serif; }
.theme:hover, .lang summary:hover { color: var(--text); }
.theme .moon { display: none; }
:root[data-theme="dark"] .theme .sun { display: none; }
:root[data-theme="dark"] .theme .moon { display: inline; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .theme .sun { display: none; } :root:not([data-theme="light"]) .theme .moon { display: inline; } }
.lang { position: relative; }
.lang summary { list-style: none; }
.lang summary::-webkit-details-marker { display: none; }
.lang ul { position: absolute; right: 0; top: 44px; list-style: none; margin: 0; padding: 6px; min-width: 190px; max-height: 70vh; overflow: auto; background: var(--card); border: 1px solid var(--border); border-radius: 12px; box-shadow: 0 12px 32px rgb(0 0 0 / .18); }
.lang li a { display: block; padding: 7px 10px; border-radius: 8px; color: var(--text); text-decoration: none; }
.lang li a:hover, .lang li a[aria-current="true"] { background: var(--raised); }

/* Buttons, badges */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 48px; padding: 0 24px; border-radius: 999px; background: var(--accent); color: var(--on-accent); border: 2px solid var(--accent); font-weight: 600; text-decoration: none; cursor: pointer; font-size: 1rem; font-family: inherit; transition: transform .12s, box-shadow .12s; }
.btn:hover { transform: translateY(-1px); box-shadow: 0 6px 18px color-mix(in srgb, var(--accent) 35%, transparent); text-decoration: none; }
.btn-ghost { background: transparent; color: var(--text); border-color: var(--border); }
.btn-ghost:hover { border-color: var(--accent); box-shadow: none; }
.btn-small { min-height: 36px; padding: 0 16px; font-size: .92rem; }
.btn[disabled] { opacity: .5; cursor: not-allowed; transform: none; box-shadow: none; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 24px 0; }
.actions.center { justify-content: center; }
.badge { display: inline-block; padding: 5px 12px; border-radius: 999px; background: var(--accent-soft); color: var(--accent); font-weight: 600; font-size: .85rem; margin-bottom: 18px; }
.tag { display: inline-block; padding: 3px 10px; border-radius: 999px; background: var(--accent-soft); color: var(--accent); font-weight: 600; font-size: .8rem; white-space: nowrap; }
.tag-muted { background: var(--raised); color: var(--muted); }

/* Sections */
.band { padding: 72px 0; }
.band.alt { background: var(--side); border-block: 1px solid var(--border); }
.card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 28px; box-shadow: var(--shadow); }
.hero { padding: 72px 0 56px; background: radial-gradient(900px 400px at 85% 10%, color-mix(in srgb, var(--accent2) 16%, transparent), transparent), radial-gradient(700px 380px at 10% 0%, color-mix(in srgb, var(--accent) 14%, transparent), transparent); }
.hero-in { display: grid; grid-template-columns: 1.25fr .9fr; gap: 48px; align-items: center; }
.hero-points { list-style: none; padding: 0; margin: 8px 0 0; display: flex; flex-wrap: wrap; gap: 10px 22px; color: var(--muted); font-size: .95rem; }
.hero-points li::before { content: "✓"; color: var(--accent); font-weight: 700; margin-right: 8px; }
.hero-art { position: relative; aspect-ratio: 1; display: grid; place-items: center; }
.hero-art img { position: relative; width: 44%; filter: drop-shadow(0 18px 40px color-mix(in srgb, var(--accent) 45%, transparent)); animation: float 6s ease-in-out infinite; }
.ring { position: absolute; border-radius: 50%; border: 2px solid color-mix(in srgb, var(--accent) 35%, transparent); animation: pulse 6s ease-in-out infinite; }
.r1 { inset: 22%; } .r2 { inset: 11%; animation-delay: .8s; opacity: .7; } .r3 { inset: 0; animation-delay: 1.6s; opacity: .45; border-color: color-mix(in srgb, var(--accent2) 35%, transparent); }
@keyframes float { 50% { transform: translateY(-10px); } }
@keyframes pulse { 50% { transform: scale(1.03); } }
@media (prefers-reduced-motion: reduce) { .hero-art img, .ring { animation: none; } .btn { transition: none; } }
.steps { list-style: none; padding: 0; margin: 32px 0 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.num { display: inline-grid; place-items: center; width: 36px; height: 36px; border-radius: 50%; background: var(--accent-soft); color: var(--accent); font-weight: 700; margin-bottom: 12px; }
.two { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.grid4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin: 32px 0; }
.side h2 { font-size: 1.6rem; }
.checks { list-style: none; padding: 0; margin: 0 0 24px; }
.checks li { padding-left: 28px; position: relative; margin: 8px 0; }
.checks li::before { content: ""; position: absolute; left: 0; top: .5em; width: 16px; height: 9px; border-left: 3px solid var(--accent); border-bottom: 3px solid var(--accent); transform: rotate(-45deg); }
.feature h3 { color: var(--text); }
.feature p { color: var(--muted); margin: 0; font-size: .97rem; }
.final { background: linear-gradient(135deg, color-mix(in srgb, var(--accent) 16%, var(--bg)), color-mix(in srgb, var(--accent2) 14%, var(--bg))); }
.page-head { padding: 56px 0 8px; }
.page-head h1 { font-size: clamp(1.9rem, 4vw, 2.8rem); }

/* Text */
.prose h2 { margin-top: 1.8em; }
.prose h3 { margin-top: 1.4em; }
.prose ul, .prose ol { padding-left: 1.3em; }
.prose li { margin: .35em 0; }
.prose code { font: .9em ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace; background: var(--raised); padding: 2px 6px; border-radius: 6px; }
.prose pre { background: var(--side); border: 1px solid var(--border); border-radius: 12px; padding: 16px; overflow-x: auto; font-size: .9rem; }
.prose pre code { background: none; padding: 0; }
.prose table { width: 100%; border-collapse: collapse; margin: 1em 0; font-size: .95rem; }
.prose th, .prose td { text-align: left; padding: 10px; border-bottom: 1px solid var(--border); vertical-align: top; }
.prose blockquote { margin: 1em 0; padding: 12px 18px; border-left: 4px solid var(--accent); background: var(--accent-soft); border-radius: 0 12px 12px 0; }
.prose blockquote p:last-child { margin: 0; }
.toc { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 16px 20px; margin-bottom: 32px; }
.toc h2 { font-size: 1rem; margin: 0 0 8px; }
.toc ol { margin: 0; padding-left: 1.2em; }
details.qa { background: var(--card); border: 1px solid var(--border); border-radius: 12px; margin: 10px 0; padding: 0 18px; }
details.qa summary { cursor: pointer; padding: 16px 0; font-weight: 600; list-style: none; position: relative; padding-right: 28px; }
details.qa summary::-webkit-details-marker { display: none; }
details.qa summary::after { content: "+"; position: absolute; right: 0; top: 13px; font-size: 1.4rem; color: var(--muted); }
details.qa[open] summary::after { content: "−"; }
details.qa p { color: var(--muted); }
.dl-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.dl-head h2 { font-size: 1.3rem; margin: 0; }

/* Account */
.account { margin-bottom: 32px; }
.account label { display: block; font-weight: 600; margin: 16px 0 6px; }
.account input { width: 100%; min-height: 50px; padding: 0 14px; border-radius: 12px; border: 1px solid var(--border); background: var(--raised); color: var(--text); font: 500 1.05rem Inter, sans-serif; }
.account input.code { letter-spacing: .4em; text-align: center; font-weight: 700; font-size: 1.5rem; }
.account input:focus { outline: 2px solid var(--accent); border-color: transparent; }
.account .links { display: flex; gap: 16px; flex-wrap: wrap; font-size: .95rem; }
.account .links button { background: none; border: 0; color: var(--accent); cursor: pointer; font: inherit; padding: 0; text-decoration: underline; text-underline-offset: 3px; }
.account .error { color: var(--danger); font-weight: 500; }
.account .note { color: var(--accent); }
.account table { width: 100%; border-collapse: collapse; margin: 12px 0 20px; }
.account th, .account td { text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--border); }
.account .who { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.account pre { background: var(--side); border: 1px solid var(--border); border-radius: 12px; padding: 14px; overflow-x: auto; white-space: pre-wrap; word-break: break-all; font-size: .88rem; }
.state-on { color: var(--accent); font-weight: 600; }

/* Footer */
.foot { border-top: 1px solid var(--border); background: var(--side); padding: 56px 0 24px; margin-top: 0; }
.foot-in { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1.3fr; gap: 32px; }
.foot h2 { font-size: .85rem; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); margin-bottom: 12px; }
.foot ul { list-style: none; margin: 0; padding: 0; }
.foot li { margin: 6px 0; }
.foot li a { color: var(--text); text-decoration: none; font-size: .95rem; }
.foot li a:hover { color: var(--accent); }
.foot-langs { columns: 2; column-gap: 16px; }
.foot-brand p { margin: 12px 0 0; }
.foot-bottom { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; border-top: 1px solid var(--border); margin-top: 40px; padding-top: 20px; font-size: .88rem; color: var(--muted); }
.notfound { min-height: 100vh; display: grid; place-content: center; text-align: center; gap: 8px; padding: 24px; }

/* Narrow screens */
@media (max-width: 1080px) {
  .grid4 { grid-template-columns: 1fr 1fr; }
  .nav-toggle { display: inline-flex; width: 42px; height: 38px; border: 1px solid var(--border); border-radius: 10px; align-items: center; justify-content: center; cursor: pointer; background: var(--card); }
  .nav-toggle span, .nav-toggle span::before, .nav-toggle span::after { display: block; width: 18px; height: 2px; background: var(--text); position: relative; content: ""; }
  .nav-toggle span::before { position: absolute; top: -6px; } .nav-toggle span::after { position: absolute; top: 6px; }
  .nav-links { display: none; position: absolute; left: 0; right: 0; top: 64px; flex-direction: column; align-items: stretch; background: var(--card); border-bottom: 1px solid var(--border); padding: 12px 16px 16px; box-shadow: 0 12px 24px rgb(0 0 0 / .12); }
  .nav-toggle-box:checked ~ .nav-links { display: flex; }
  .nav-links .nav-account a { margin: 8px 0 0; text-align: center; }
  .foot-in { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 760px) {
  body { font-size: 16px; }
  .hero-in, .two, .grid2, .steps { grid-template-columns: 1fr; }
  .hero-art { max-width: 280px; margin: 0 auto; order: -1; }
  .grid4 { grid-template-columns: 1fr; }
  .band { padding: 52px 0; }
  .brand span { display: none; }
  .foot-brand .brand span { display: inline; }
  .foot-in { grid-template-columns: 1fr; }
}

.soon { margin: -8px 0 0; font-weight: 600; font-size: .95rem; }
.soon a { text-decoration: none; }
.notice { margin: 20px 0; padding: 14px 18px; border-radius: 12px; background: var(--accent-soft); border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent); }

.account textarea { width: 100%; padding: 12px 14px; border-radius: 12px; border: 1px solid var(--border); background: var(--raised); color: var(--text); font: 500 1rem Inter, sans-serif; resize: vertical; }
.account textarea:focus { outline: 2px solid var(--accent); border-color: transparent; }
.account .research { margin-top: 36px; padding-top: 28px; border-top: 1px solid var(--border); }