/* ==========================================================================
   Sanya — design system
   Neutral graphite surfaces, one accent colour and restrained, local motion.
   The download section gets a subtle, local gradient and arrival cue.
   ========================================================================== */

:root {
  /* surfaces */
  --bg:        #0c0e12;
  --bg-2:      #10131a;
  --surface:   #151922;
  --surface-2: #1b202b;
  /* lines */
  --line:      #252a35;
  --line-2:    #343b4a;
  --outline:   #252a35;
  --surface-tint: #1b202b;
  /* text */
  --text:      #eceef2;
  --text-2:    #b0b7c3;
  --text-3:    #8b93a1;
  /* accent + signal colours */
  --accent:     #b3a5f6;
  --accent-2:   #78a2e8;
  --accent-ink: #15121f;
  --accent-hover: #d0c8ff;
  --ok:         #6fcf97;
  --warn:       #e6bd59;
  --bad:        #ef7683;

  --font: "Segoe UI Variable Text", "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Roboto, Arial, sans-serif;
  --font-display: "Segoe UI Variable Display", "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Roboto, Arial, sans-serif;
  --mono: ui-monospace, "Cascadia Mono", "Cascadia Code", Consolas, "SF Mono", Menlo, monospace;

  --radius: 8px;
  --nav-h: 64px;
  --container: 1200px;
  --nav-shadow: 0 8px 24px rgba(0, 0, 0, .10);
}

/* Warm Paper light palette: gentle contrast, warm surfaces, no blur or glass layers. */
html[data-theme="light"] {
  color-scheme: light;
  --bg:           #FAF6EF;
  --bg-2:         #F1E8DC;
  --surface:      #FFFCF7;
  --surface-2:    #F1E8DC;
  --surface-tint: #F1E8DC;
  --line:         #D6C6B5;
  --line-2:       #C5B29F;
  --outline:      #D6C6B5;
  --text:         #322B25;
  --text-2:       #65584B;
  --text-3:       #827365;
  --accent:       #B45309;
  --accent-2:     #0F766E;
  --accent-ink:   #FFFFFF;
  --accent-hover: #92400E;
  --ok:           #0F766E;
  --warn:         #9A5A0A;
  --bad:          #B64032;
  --nav-shadow:   0 6px 20px rgba(50, 43, 37, .055);
}
html { color-scheme: dark; }

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; scroll-padding-top: calc(var(--nav-h) + 16px); }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 400 1.0625rem/1.65 var(--font);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, video { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-underline-offset: .2em; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
p { margin: 0 0 1em; }
code, kbd { font-family: var(--mono); font-size: .88em; }
code { background: var(--surface-2); border: 1px solid var(--line); border-radius: 4px; padding: .08em .4em; color: var(--text); }
kbd { background: var(--surface); border: 1px solid var(--line-2); border-bottom-width: 2px; border-radius: 4px; padding: .05em .45em; }
h1, h2, h3 { font-family: var(--font-display); margin: 0; font-weight: 650; letter-spacing: -.02em; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }
.skip {
  position: absolute; left: 16px; top: -64px; z-index: 100;
  background: var(--accent); color: var(--accent-ink); padding: 10px 16px; border-radius: 6px; font-weight: 600; text-decoration: none;
}
.skip:focus { top: 12px; }

.container { width: min(var(--container), 100% - 48px); margin-inline: auto; }
.visually-hidden { position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }

/* ---------- navigation ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: var(--bg);
  border-bottom: 1px solid var(--line);
  box-shadow: var(--nav-shadow);
}
.nav-in { min-height: var(--nav-h); display: flex; align-items: center; gap: clamp(14px, 1.7vw, 22px); }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-weight: 700; font-size: 1.04rem; letter-spacing: -.025em; flex: none; }
.brand img { width: 28px; height: 28px; border-radius: 7px; }
.nav-links { display: flex; align-items: center; gap: 3px; margin: 0 0 0 auto; padding: 0; list-style: none; }
.nav-links > li > a { display: block; padding: 9px 12px; border-radius: 7px; color: var(--text-2); text-decoration: none; font-size: .92rem; font-weight: 550; white-space: nowrap; transition: color .16s ease, background-color .16s ease; }
.nav-links > li > a:hover { color: var(--text); background: var(--surface-2); text-decoration: none; }
.nav-links > li > a[aria-current="page"] { color: var(--text); background: transparent; box-shadow: none; position: relative; }
.nav-links > li > a[aria-current="page"]::after { content: ""; position: absolute; left: 12px; right: 12px; bottom: 3px; height: 2px; border-radius: 2px; background: var(--accent); }
.nav-links .nav-cta { margin-left: 8px; padding-left: 14px; border-left: 1px solid var(--line); }
.nav-links .nav-cta > a.btn-primary,
.nav-links .nav-cta > a.btn-primary:hover,
.nav-links .nav-cta > a.btn-primary:focus-visible { color: var(--accent-ink); }
.nav-links .nav-cta > a.btn-primary:hover,
.nav-links .nav-cta > a.btn-primary:focus-visible { background: var(--accent-hover); border-color: var(--accent-hover); }
.language-switch { position: relative; display: flex; align-items: center; margin-left: 5px; }
.language-picker { position: relative; }
.language-trigger, .theme-toggle {
  appearance: none; display: inline-flex; align-items: center; justify-content: center; gap: 7px;
  min-width: 40px; height: 40px; padding: 0 9px; border: 1px solid var(--line-2);
  border-radius: 8px; background: var(--surface); color: var(--text); cursor: pointer;
  font: inherit; line-height: 1; transition: background-color .16s ease, border-color .16s ease, transform .16s ease;
}
.language-trigger:hover, .theme-toggle:hover { background: var(--surface-2); border-color: var(--accent); }
.language-trigger:active, .theme-toggle:active { transform: translateY(1px); }
.language-trigger-flag { font-size: 1.12rem; line-height: 1; }
.language-chevron { width: 13px; height: 13px; color: var(--text-3); transition: transform .16s ease; }
.language-picker.open .language-chevron { transform: rotate(180deg); }
.language-menu {
  position: absolute; top: calc(100% + 10px); right: 0; z-index: 100;
  width: 184px; padding: 6px; border: 1px solid var(--line-2); border-radius: 10px;
  background: var(--surface); box-shadow: 0 14px 36px rgba(0, 0, 0, .20);
  opacity: 0; visibility: hidden; transform: translateY(-4px); pointer-events: none;
  transition: opacity .15s ease, transform .15s ease, visibility .15s ease;
}
.language-picker.open .language-menu { opacity: 1; visibility: visible; transform: translateY(0); pointer-events: auto; }
.language-menu .lang-btn { appearance: none; display: grid; grid-template-columns: 24px 1fr 16px; align-items: center; gap: 9px; width: 100%; min-height: 40px; padding: 0 9px; border: 1px solid transparent; border-radius: 7px; background: transparent; color: var(--text-2); text-align: left; font: 500 .9rem var(--font); cursor: pointer; }
.language-menu .lang-btn:hover { background: var(--surface-2); color: var(--text); }
.language-menu .lang-btn.is-active { color: var(--text); background: var(--surface-2); }
.lang-option-flag { font-size: 1.12rem; }
.lang-check { color: var(--accent); opacity: 0; font-weight: 700; }
.lang-btn.is-active .lang-check { opacity: 1; }
.theme-item { margin-left: 2px; }
.theme-toggle { width: 40px; padding: 0; font-size: 1.1rem; }
.scroll-bar { position: absolute; left: 0; bottom: -1px; height: 2px; width: 100%; background: var(--accent); transform: scaleX(0); transform-origin: 0 50%; }

/* Section jump menu: a crisp, opaque popover with keyboard-friendly targets. */
.nav-toggle {
  display: none; flex: none; align-items: center; justify-content: center;
  width: 40px; height: 40px; margin-left: 8px; padding: 0;
  background: var(--surface); border: 1px solid var(--line-2); border-radius: 9px;
  color: var(--text); cursor: pointer;
  transition: background-color .16s ease, border-color .16s ease, transform .16s ease;
}
.nav-toggle:hover { background: var(--surface-2); border-color: var(--accent); }
.nav-toggle:active { transform: translateY(1px); }
.nav-toggle svg { width: 20px; height: 20px; }
.nav-quick-menu {
  display: none; position: absolute; z-index: 100; top: calc(var(--nav-h) + 8px);
  right: max(24px, calc((100% - var(--container)) / 2));
  width: min(390px, calc(100vw - 32px)); padding: 16px;
  background: var(--surface); color: var(--text); border: 1px solid var(--line-2);
  border-radius: 12px; box-shadow: 0 18px 44px rgba(0, 0, 0, .20);
}
.nav-quick-menu.open { display: block; animation: nav-menu-enter .16s ease-out both; }
@keyframes nav-menu-enter { from { opacity: 0; transform: translateY(-5px); } to { opacity: 1; transform: translateY(0); } }
.nav-quick-title { margin: 0 0 12px; color: var(--text-3); font-size: .74rem; line-height: 1.2; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; }
.nav-quick-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 5px; }
.nav-quick-link { display: flex; align-items: center; justify-content: space-between; gap: 10px; min-height: 42px; padding: 9px 10px; border: 1px solid transparent; border-radius: 8px; color: var(--text-2); font-size: .9rem; font-weight: 550; text-decoration: none; transition: color .14s ease, background-color .14s ease, border-color .14s ease; }
.nav-quick-link:hover, .nav-quick-link:focus-visible { background: var(--surface-2); border-color: var(--line); color: var(--text); text-decoration: none; }
.nav-section-arrow { color: var(--accent-2); font-size: .9rem; flex: none; }
.nav-section-jumps { display: none; }
html[data-theme="light"] .nav-quick-menu { box-shadow: 0 18px 44px rgba(50, 43, 37, .11); }


/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  min-height: 44px; padding: 0 20px; border-radius: 6px;
  font: 600 .98rem/1 var(--font); text-decoration: none; cursor: pointer;
  color: var(--text); background: transparent; border: 1px solid var(--line-2);
  transition: background-color .15s, border-color .15s, color .15s;
}
.btn:hover { background: var(--surface); border-color: var(--text-3); text-decoration: none; }
.btn-primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn-primary:hover, .btn-primary:focus-visible { background: var(--accent-hover); border-color: var(--accent-hover); color: var(--accent-ink); }
/* Keep the navigation CTA readable even though general nav links have hover styling. */
.nav-links .nav-cta > a.btn-primary,
.nav-links .nav-cta > a.btn-primary:hover,
.nav-links .nav-cta > a.btn-primary:focus-visible { color: var(--accent-ink); }
.nav-links .nav-cta > a.btn-primary:hover,
.nav-links .nav-cta > a.btn-primary:focus-visible { background: var(--accent-hover); border-color: var(--accent-hover); }
.btn-sm { min-height: 38px; padding: 0 14px; font-size: .92rem; }
.btn svg { width: 18px; height: 18px; flex: none; }

/* Download indicator: the one animated highlight on the site */
.live-dot { position: relative; display: inline-block; width: 8px; height: 8px; border-radius: 50%; background: var(--accent); flex: none; }
.live-dot::after {
  content: ""; position: absolute; inset: -5px; border-radius: 50%; border: 1.5px solid var(--accent);
  animation: indicator 2.4s ease-out infinite;
}
@keyframes indicator { 0% { transform: scale(.55); opacity: .95; } 100% { transform: scale(1.9); opacity: 0; } }
.status { display: inline-flex; align-items: center; gap: 12px; color: var(--text-2); font-size: .92rem; }

/* ---------- typography helpers ---------- */
.label { margin: 0 0 14px; font-size: .78rem; font-weight: 600; letter-spacing: .09em; text-transform: uppercase; color: var(--text-3); }
.label b { color: var(--accent); font-weight: 600; }
.lead { font-size: 1.2rem; line-height: 1.6; color: var(--text-2); max-width: 36em; }
.muted { color: var(--text-2); }
.small { font-size: .9rem; color: var(--text-3); }
h1 { font-size: clamp(2.5rem, 5.2vw, 4.4rem); line-height: 1.03; letter-spacing: -.035em; }
h2 { font-size: clamp(1.9rem, 3.4vw, 2.9rem); line-height: 1.1; letter-spacing: -.028em; }
h3 { font-size: 1.15rem; letter-spacing: -.01em; }

/* ---------- sections ---------- */
.section { padding-block: clamp(72px, 10vw, 128px); border-top: 1px solid var(--line); }
.section-head { display: grid; grid-template-columns: minmax(0, 4fr) minmax(0, 8fr); gap: 40px; margin-bottom: clamp(36px, 5vw, 64px); align-items: end; }
.section-head p { margin: 0; color: var(--text-2); max-width: 40em; }
.band { background: var(--bg-2); }

/* ---------- hero ---------- */
.hero { position: relative; overflow: clip; }
.hero-bg {
  position: absolute; inset: 0; background: url("../assets/web/backdrop.webp") center top / cover no-repeat; opacity: .2;
  -webkit-mask-image: linear-gradient(to bottom, #000 0, #000 35%, transparent 100%); mask-image: linear-gradient(to bottom, #000 0, #000 35%, transparent 100%);
}
.hero-grid { position: relative; display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: clamp(32px, 5vw, 72px); align-items: center; padding-block: clamp(48px, 8vw, 104px); }
.hero h1 { margin-bottom: 22px; }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 14px 22px; margin-top: 34px; }
.hero-stage { perspective: 1600px; perspective-origin: 50% 35%; }
.hero-simple { padding-block: clamp(56px, 9vw, 120px) clamp(40px, 6vw, 72px); position: relative; }
.hero-simple h1 { max-width: 14em; margin-bottom: 22px; }

/* ---------- facts ---------- */
.facts { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); border-top: 1px solid var(--line); }
.fact { padding: 22px 24px 22px 0; }
.fact + .fact { padding-left: 24px; border-left: 1px solid var(--line); }
.fact dt { font-size: .78rem; letter-spacing: .09em; text-transform: uppercase; color: var(--text-3); margin-bottom: 4px; font-weight: 600; }
.fact dd { margin: 0; font-weight: 600; }

/* ---------- frames ---------- */
.frame { position: relative; margin: 0; border: 1px solid var(--line-2); border-radius: 10px; overflow: hidden; background: #000; box-shadow: 0 40px 80px -44px rgba(0, 0, 0, .9); container-type: inline-size; }
.frame > img { width: 100%; }
.frame.multi { aspect-ratio: 4 / 3; }
.frame.multi .layer { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; opacity: 0; transition: opacity .45s ease; }
.frame.multi .layer.is-on { opacity: 1; }
.caption { margin-top: 12px; font-size: .86rem; color: var(--text-3); }
.focus {
  position: absolute; left: calc(var(--x) * 1%); top: calc(var(--y) * 1%); width: calc(var(--w) * 1%); height: calc(var(--h) * 1%);
  border: 1.5px solid var(--accent); border-radius: 4px; pointer-events: none; opacity: 0; transition: opacity .35s ease;
  box-shadow: 0 0 0 100vmax rgba(8, 9, 12, .6);   /* dims the rest of the screenshot: a spotlight, not a glow */
}
.focus.is-on { opacity: 1; }

/* fly-in: perspective entrance. JS drives the values while scrolling */
.flyin { will-change: transform, opacity; transform-origin: 50% 60%; }
.js .flyin { opacity: 0; transform: translate3d(0, 70px, -240px) rotateX(9deg) scale(.92); }
.js .hero-stage .flyin { animation: heroIn 1s cubic-bezier(.2, .7, .2, 1) .1s both; }
@keyframes heroIn { from { opacity: 0; transform: translate3d(0, 70px, -240px) rotateX(9deg) scale(.92); } to { opacity: 1; transform: none; } }

.reveal { transition: opacity .6s ease, transform .6s ease; }
.js .reveal:not(.in) { opacity: 0; transform: translateY(14px); }

/* ---------- pinned scenes ---------- */
.scene { position: relative; height: var(--scene-h, 300vh); border-top: 1px solid var(--line); }
.scene-pin { position: sticky; top: var(--nav-h); height: calc(100vh - var(--nav-h)); display: flex; align-items: center; overflow: hidden; }
.scene-grid { width: min(1280px, 100% - 48px); margin-inline: auto; display: grid; grid-template-columns: minmax(0, 4.6fr) minmax(0, 7.4fr); gap: clamp(32px, 5vw, 72px); align-items: center; }
.scene-copy h2 { margin-bottom: 14px; }
.scene-copy > p { color: var(--text-2); max-width: 30em; }
.scene-stage { perspective: 1600px; perspective-origin: 50% 40%; }
.steps { list-style: none; margin: 28px 0 0; padding: 0; border-top: 1px solid var(--line); }
.step { position: relative; padding: 15px 0 15px 22px; border-bottom: 1px solid var(--line); color: var(--text-3); transition: color .3s; }
.step::before { content: ""; position: absolute; left: 0; top: 16px; bottom: 16px; width: 2px; background: var(--line-2); transition: background-color .3s; }
.step h3 { font-size: 1.02rem; font-weight: 600; color: inherit; margin-bottom: 0; }
.step p { margin: 0; font-size: .95rem; color: var(--text-2); max-height: 0; opacity: 0; overflow: hidden; transition: max-height .4s ease, opacity .3s ease, margin .3s ease; }
.step.is-on { color: var(--text); }
.step.is-on::before { background: var(--accent); }
.step.is-on p { max-height: 10em; opacity: 1; margin-top: 6px; }
.badge { display: inline-block; margin-left: 10px; padding: 2px 8px; border: 1px solid var(--accent); border-radius: 4px; font-size: .72rem; letter-spacing: .06em; text-transform: uppercase; color: var(--accent); vertical-align: middle; font-weight: 600; }

/* static layout (narrow screens, reduced motion): no pinning */
.static .scene { height: auto; }
.static .scene-pin { position: static; height: auto; padding-block: 56px; overflow: visible; }
.static .scene-grid { grid-template-columns: minmax(0, 1fr); }
.static .step { color: var(--text-2); }
.static .step p { max-height: none; opacity: 1; margin-top: 6px; }
.static .step::before { background: var(--accent); }
.static .focus { display: none; }
.static .frame.multi { aspect-ratio: auto; display: grid; gap: 14px; border: 0; background: transparent; box-shadow: none; overflow: visible; }
.static .frame.multi .layer { position: static; opacity: 1; height: auto; border: 1px solid var(--line-2); border-radius: 10px; }
.static .frame.multi .panel { position: static; opacity: 1; aspect-ratio: 4 / 3; border: 1px solid var(--line-2); border-radius: 10px; }
.static .flyin, .static .reveal { opacity: 1 !important; transform: none !important; animation: none !important; }

/* ---------- feature list ---------- */
.spec { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.spec li { display: grid; grid-template-columns: 56px minmax(0, 3fr) minmax(0, 7fr); gap: 24px; padding: 22px 0; border-bottom: 1px solid var(--line); align-items: baseline; }
.spec .n { font-family: var(--mono); font-size: .85rem; color: var(--text-3); }
.spec h3 { font-size: 1.08rem; }
.spec p { margin: 0; color: var(--text-2); }

/* ---------- tables ---------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); margin: 18px 0 24px; }
table { width: 100%; border-collapse: collapse; font-size: .95rem; }
th, td { text-align: left; padding: 12px 16px; border-bottom: 1px solid var(--line); vertical-align: top; }
thead th { background: var(--surface); color: var(--text-2); font-weight: 600; font-size: .8rem; letter-spacing: .06em; text-transform: uppercase; white-space: nowrap; }
tbody tr:last-child td { border-bottom: 0; }
tbody td:first-child { white-space: nowrap; }
.versions td:first-child, .versions th:first-child { width: 150px; }
.versions td:nth-child(2) { white-space: nowrap; color: var(--text-3); width: 110px; }
.plain-list { margin: 0 0 1.2em; padding-left: 1.2em; color: var(--text-2); }
.plain-list li { margin-bottom: .4em; }

/* ---------- panels used for the Auditor illustration ---------- */
.panel { position: absolute; inset: 0; background: var(--bg-2); opacity: 0; transition: opacity .45s ease; display: flex; flex-direction: column; font-size: 2.15cqw; }
.panel.is-on { opacity: 1; }
.panel-bar { display: flex; align-items: center; justify-content: space-between; padding: .7em 1.2em; border-bottom: 1px solid var(--line); background: var(--surface); color: var(--text-2); font-size: .9em; }
.panel-bar b { color: var(--text); font-weight: 600; }
.panel-body { flex: 1; padding: 1.2em 1.4em; overflow: hidden; }
.issue { display: grid; grid-template-columns: 4.6em 5.4em 1fr; gap: .8em; padding: .65em 0; border-bottom: 1px solid var(--line); font-family: var(--mono); font-size: .86em; color: var(--text-2); }
.issue .sev { font-weight: 700; }
.sev-err { color: var(--bad); } .sev-warn { color: var(--warn); } .sev-info { color: #8fb0e8; }
.cmp { display: grid; grid-template-columns: 1fr 1fr; gap: 2em; height: 100%; }
.cmp h4 { margin: 0 0 .5em; font-size: .78em; letter-spacing: .09em; text-transform: uppercase; color: var(--text-3); font-weight: 600; }
.grid8 { display: grid; grid-template-columns: repeat(8, 1fr); gap: .28em; font-family: var(--mono); font-size: .7em; }
.grid8 i { display: block; aspect-ratio: 1.55 / 1; border-radius: .25em; background: var(--surface); font-style: normal; }
.grid8 .h { background: none; aspect-ratio: auto; text-align: center; color: var(--text-3); }
.grid8 .n { background: #6f8fd0; }
.grid8 .a { background: var(--ok); }
.grid8 .r { background: var(--bad); }
.grid8 .g { background: none; outline: 1.5px solid var(--bad); outline-offset: -1.5px; }
.legend { display: flex; gap: 1.4em; margin-top: 1em; font-size: .8em; color: var(--text-2); }
.legend span::before { content: ""; display: inline-block; width: .8em; height: .8em; border-radius: .2em; margin-right: .5em; vertical-align: -.05em; background: var(--c); }
.csv { margin: 0; font-family: var(--mono); font-size: .78em; line-height: 1.7; color: var(--text-2); white-space: pre; overflow: hidden; }
.csv .hd { color: var(--text-3); }
.csv .ad { color: var(--ok); } .csv .rm { color: var(--bad); } .csv .mv { color: var(--warn); }

/* ---------- projects (home) ---------- */
.project { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: clamp(32px, 5vw, 72px); align-items: center; padding-block: clamp(40px, 6vw, 72px); border-top: 1px solid var(--line); }
.project:nth-of-type(even) .project-copy { order: 2; }
.project h3 { font-size: clamp(1.7rem, 3vw, 2.4rem); letter-spacing: -.028em; margin-bottom: 12px; }
.tags { display: flex; flex-wrap: wrap; gap: 8px; margin: 22px 0 28px; padding: 0; list-style: none; }
.tags li { padding: 4px 12px; border: 1px solid var(--line-2); border-radius: 4px; font-size: .85rem; color: var(--text-2); }
.project-stage { perspective: 1600px; perspective-origin: 50% 40%; }

/* ---------- download ---------- */
.download { display: grid; grid-template-columns: minmax(0, 6fr) minmax(0, 6fr); gap: clamp(32px, 5vw, 72px); align-items: start; }
/* The accent wash is local to the download section; the rest of the page remains calm. */
section#download { position: relative; isolation: isolate; background: radial-gradient(ellipse 58% 90% at 86% 46%, rgba(179, 165, 246, .10), transparent 72%), linear-gradient(118deg, #10131a 0%, #12141d 58%, #11121a 100%); scroll-margin-top: calc(var(--nav-h) + 10px); }
html[data-theme="light"] section#download { background: radial-gradient(ellipse 58% 90% at 86% 46%, rgba(180, 83, 9, .075), transparent 72%), linear-gradient(118deg, #FAF6EF 0%, #F1E8DC 58%, #F8F1E7 100%); }
section#download::after { content: ""; position: absolute; z-index: 0; inset: 0; pointer-events: none; border-top: 1px solid rgba(179, 165, 246, .15); opacity: 0; }
section#download.download-arrive::after { animation: download-sweep .95s ease-out both; }
section#download > .container { position: relative; z-index: 1; }
@keyframes download-sweep { 0% { opacity: 0; transform: translateX(-2%); } 24% { opacity: 1; } 100% { opacity: 0; transform: translateX(0); } }
.dl-card { position: relative; border: 1px solid var(--line-2); border-radius: 10px; background: var(--surface); padding: clamp(24px, 3vw, 36px); isolation: isolate; }
.dl-card.dl-glow { animation: dl-card-arrival 1.35s cubic-bezier(.2, .7, .2, 1) both; }
@keyframes dl-card-arrival {
  0% { transform: translateY(5px); box-shadow: 0 0 0 rgba(179, 165, 246, 0); border-color: var(--line-2); }
  25% { transform: translateY(0); box-shadow: 0 0 0 1px rgba(179, 165, 246, .22), 0 0 30px rgba(179, 165, 246, .16); border-color: var(--accent); }
  100% { transform: translateY(0); box-shadow: 0 0 0 rgba(179, 165, 246, 0); border-color: var(--line-2); }
}
.dl-trace { position: absolute; inset: 0; z-index: 5; width: 100%; height: 100%; pointer-events: none; overflow: visible; }
.dl-trace path { fill: none; stroke: url(#sanyaDownloadTraceGradient); stroke-width: 1.7; stroke-linejoin: round; stroke-linecap: round; stroke-dasharray: 1; stroke-dashoffset: 1; opacity: 0; }
.dl-trace.run path { animation: dl-trace-draw 1.35s cubic-bezier(.3, .7, .2, 1) both; }
@keyframes dl-trace-draw { 0% { stroke-dashoffset: 1; opacity: 0; } 9% { opacity: .95; } 76% { opacity: .9; } 100% { stroke-dashoffset: 0; opacity: 0; } }
.dl-actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 24px 0 18px; }
.dl-actions .btn-primary.dl-pulse { animation: dl-button-pulse 1.45s cubic-bezier(.2, .7, .2, 1) 0s both; }
@keyframes dl-button-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(179, 165, 246, 0); transform: translateY(0); }
  24% { box-shadow: 0 0 0 4px rgba(179, 165, 246, .17), 0 7px 22px rgba(179, 165, 246, .18); border-color: var(--accent); transform: translateY(-1px); }
  58% { box-shadow: 0 0 0 2px rgba(179, 165, 246, .09), 0 4px 13px rgba(179, 165, 246, .10); }
}
.dl-meta { display: grid; gap: 0; margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.dl-meta li { display: flex; justify-content: space-between; gap: 16px; padding: 12px 0; border-bottom: 1px solid var(--line); font-size: .95rem; }
.dl-meta li span:first-child { color: var(--text-3); }
details.note { margin-top: 18px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--bg-2); }
details.note summary { cursor: pointer; padding: 14px 16px; font-weight: 600; font-size: .95rem; list-style-position: inside; }
details.note .body { padding: 0 18px 16px; color: var(--text-2); font-size: .95rem; }
details.note .body ol { padding-left: 1.2em; }

/* ---------- video ---------- */
.video { position: relative; aspect-ratio: 16 / 9; border: 1px solid var(--line-2); border-radius: 10px; overflow: hidden; background: #000; }
.video > img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; opacity: .55; }
.video button { position: absolute; inset: 0; width: 100%; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 14px; background: transparent; border: 0; color: var(--text); cursor: pointer; font: inherit; }
.video .play { width: 64px; height: 64px; border-radius: 50%; border: 1.5px solid var(--text); display: grid; place-items: center; background: rgba(12, 14, 18, .6); }
.video .play svg { width: 24px; height: 24px; margin-left: 3px; }
.video iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }

/* ---------- credits ---------- */
.credits { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 32px; }
.credits h3 { font-size: .78rem; letter-spacing: .09em; text-transform: uppercase; color: var(--text-3); margin-bottom: 14px; font-weight: 600; }
.credits ul { margin: 0; padding: 0; list-style: none; color: var(--text-2); }
.credits li { padding: 6px 0; border-top: 1px solid var(--line); }

/* ---------- tabs (SanConverter) ---------- */
.tabs { display: flex; flex-wrap: wrap; gap: 4px; border-bottom: 1px solid var(--line); margin-bottom: 28px; }
.tab-btn { appearance: none; background: transparent; border: 0; border-bottom: 2px solid transparent; color: var(--text-2); padding: 12px 16px; font: 600 .95rem var(--font); cursor: pointer; margin-bottom: -1px; }
.tab-btn:hover { color: var(--text); }
.tab-btn[aria-selected="true"] { color: var(--text); border-bottom-color: var(--accent); }
.tab-panel[hidden] { display: none; }
.tab-panel h3 { margin: 28px 0 8px; }
.tab-panel h3:first-child { margin-top: 0; }

/* ---------- footer ---------- */
.footer { border-top: 1px solid var(--line); padding-block: 48px 40px; color: var(--text-2); font-size: .94rem; }
.footer-grid { display: grid; grid-template-columns: minmax(0, 5fr) repeat(3, minmax(0, 2fr)); gap: 32px; }
.footer h2 { font-size: .78rem; letter-spacing: .09em; text-transform: uppercase; color: var(--text-3); margin-bottom: 12px; font-weight: 600; font-family: var(--font); }
.footer ul { margin: 0; padding: 0; list-style: none; }
.footer li { margin-bottom: 8px; }
.footer a { color: var(--text-2); text-decoration: none; }
.footer a:hover { color: var(--text); text-decoration: underline; }
.footer-base { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; margin-top: 40px; padding-top: 20px; border-top: 1px solid var(--line); color: var(--text-3); font-size: .86rem; }

/* ---------- prose pages ---------- */
.prose { max-width: 46em; }
.prose h2 { font-size: 1.5rem; margin: 2em 0 .6em; }
.prose h3 { margin: 1.6em 0 .4em; }
.prose ul { padding-left: 1.2em; color: var(--text-2); }
.placeholder { background: var(--surface-2); border: 1px dashed var(--warn); border-radius: 4px; padding: .05em .4em; color: var(--warn); }

/* ---------- responsive ---------- */
@media (max-width: 1000px) {
  .hero-grid, .project, .download { grid-template-columns: minmax(0, 1fr); }
  .project:nth-of-type(even) .project-copy { order: 0; }
  .section-head { grid-template-columns: minmax(0, 1fr); gap: 12px; }
  .facts { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .fact:nth-child(3) { padding-left: 0; border-left: 0; }
  .fact:nth-child(n+3) { border-top: 1px solid var(--line); }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .credits { grid-template-columns: minmax(0, 1fr); }
  .spec li { grid-template-columns: 44px minmax(0, 1fr); }
  .spec p { grid-column: 2; }
}
@media (max-width: 1020px) {
  .nav-toggle { display: inline-flex; }
  .nav-links { display: none; position: absolute; top: var(--nav-h); left: 0; right: 0; flex-direction: column; align-items: stretch; gap: 0; margin: 0; padding: 10px 24px 22px; background: var(--bg); border-bottom: 1px solid var(--line); box-shadow: var(--nav-shadow); }
  .nav-links.open { display: flex; animation: nav-menu-enter .16s ease-out both; }
  .nav-links a { padding: 14px 4px; border-bottom: 1px solid var(--line); border-radius: 0; font-size: 1rem; }
  .nav-links .nav-cta { margin: 14px 0 0; padding-left: 0; border-left: 0; }
  .nav-links .nav-cta a { border: 0; }
  .nav-links .language-switch { align-self: flex-start; margin: 12px 0 4px; }
  .nav-links .language-switch .lang-btn { min-width: 44px; min-height: 36px; }
  .nav-toggle { margin-left: auto; }
  .nav-quick-menu { display: none !important; }
  .nav-section-jumps { display: block; border-top: 1px solid var(--line); margin-top: 8px; padding-top: 14px; }
  .nav-section-label { display: block; padding: 0 4px 8px; color: var(--text-3); font-size: .72rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; }
  .nav-section-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 2px 10px; }
  .nav-links .nav-section-list a { display: flex; align-items: center; justify-content: space-between; gap: 8px; min-height: 34px; padding: 7px 4px; border: 0; border-radius: 6px; color: var(--text-2); font-size: .88rem; }
  .nav-links .nav-section-list a:hover { background: var(--surface-2); color: var(--text); }
  .nav-links .nav-section-list .nav-section-arrow { color: var(--accent-2); }
}
@media (max-width: 560px) {
  .container { width: min(var(--container), 100% - 32px); }
  .facts { grid-template-columns: minmax(0, 1fr); }
  .fact, .fact + .fact { padding: 16px 0; border-left: 0; }
  .fact + .fact { border-top: 1px solid var(--line); }
  .footer-grid { grid-template-columns: minmax(0, 1fr); }
  .btn { width: 100%; }
  .hero-actions .btn { width: 100%; }
  .issue { grid-template-columns: 3.4em 1fr; } .issue span:nth-child(2) { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .live-dot::after { animation: none; opacity: .6; transform: scale(1.5); }
  section#download.download-arrive::after, section#download.download-arrive .dl-card { animation: none; }
  *, *::before, *::after { transition-duration: .01ms !important; }
}
@media print { .nav, .scroll-bar { display: none; } body { background: #fff; color: #000; } }


/* ---------- refined theme details ---------- */
html[data-theme="light"] .nav { border-bottom-color: var(--outline); }
html[data-theme="light"] .hero-bg { opacity: .075; }
html[data-theme="light"] .frame { box-shadow: 0 24px 48px -34px rgba(24, 28, 40, .28); }
html[data-theme="light"] .video .play { background: rgba(250, 246, 239, .94); color: var(--text); border-color: var(--text); }
html[data-theme="light"] .focus { box-shadow: 0 0 0 100vmax rgba(20, 24, 34, .42); }
html[data-theme="light"] .language-menu { box-shadow: 0 14px 36px rgba(35, 40, 55, .12); }
html[data-theme="light"] section#download::after { border-top-color: rgba(180, 83, 9, .22); }
html[data-theme="light"] .dl-trace stop:nth-child(1) { stop-color: #B45309; }
html[data-theme="light"] .dl-trace stop:nth-child(2) { stop-color: #0F766E; }
html[data-theme="light"] .dl-trace stop:nth-child(3) { stop-color: #B45309; }
html[data-theme="light"] .dl-card.dl-glow { animation-name: dl-card-arrival-light; }
@keyframes dl-card-arrival-light {
  0% { transform: translateY(5px); box-shadow: 0 0 0 rgba(180, 83, 9, 0); border-color: var(--line-2); }
  25% { transform: translateY(0); box-shadow: 0 0 0 1px rgba(180, 83, 9, .20), 0 0 28px rgba(180, 83, 9, .10); border-color: var(--accent); }
  100% { transform: translateY(0); box-shadow: 0 0 0 rgba(180, 83, 9, 0); border-color: var(--line-2); }
}
html[data-theme="light"] .dl-actions .btn-primary.dl-pulse { animation-name: dl-button-pulse-light; }
@keyframes dl-button-pulse-light {
  0%, 100% { box-shadow: 0 0 0 0 rgba(180, 83, 9, 0); transform: translateY(0); }
  24% { box-shadow: 0 0 0 4px rgba(180, 83, 9, .13), 0 7px 18px rgba(180, 83, 9, .14); border-color: var(--accent); transform: translateY(-1px); }
  58% { box-shadow: 0 0 0 2px rgba(180, 83, 9, .07), 0 4px 12px rgba(180, 83, 9, .07); }
}
@media (max-width: 1020px) {
  .nav-in { gap: 12px; }
  .nav-links { background: var(--bg); border-bottom-color: var(--line); box-shadow: var(--nav-shadow); }
  .nav-links > li > a { padding: 13px 10px; border-bottom: 1px solid var(--line); border-radius: 7px; }
  .nav-links > li > a[aria-current="page"] { box-shadow: none; background: var(--surface); }
  .nav-links > li > a[aria-current="page"]::after { display: none; }
  .nav-links .nav-cta { margin: 12px 0 0; }
  .nav-links .nav-cta > a.btn-primary,
  .nav-links .nav-cta > a.btn-primary:hover { width: 100%; padding: 0 16px; border: 1px solid var(--accent); border-radius: 8px; }
  .nav-links .language-switch { align-self: flex-start; margin: 12px 0 4px; }
  .nav-links .theme-item { align-self: flex-start; margin: 4px 0 2px; }
  .language-menu { left: 0; right: auto; top: calc(100% + 7px); }
}
@media (prefers-reduced-motion: reduce) {
  .dl-card.dl-glow, .dl-trace.run path, .dl-actions .btn-primary.dl-pulse { animation: none !important; }
}


/* Keep the chapter-jump hamburger available on BeatUp Engine at every viewport size.
   Other pages keep the cleaner desktop navigation without a second menu control. */
@media (min-width: 1021px) {
  body.page-bue .nav-toggle { display: inline-flex; }
  body.page-bue .nav-quick-menu.open { display: block !important; }
  body:not(.page-bue) .nav-quick-menu { display: none !important; }
}


/* Refined desktop navigation rhythm */
@media (min-width: 1021px) {
  .language-switch { margin-left: 8px; }
  .nav-links .nav-cta > a.btn-sm { min-height: 38px; padding-inline: 15px; border-radius: 8px; }
  .nav-links > li > a:hover { background: var(--surface-2); }
  .nav-links > li > a[aria-current="page"]:hover { background: var(--surface-2); }
}


/* Compact footer layout when this page has no documentation links. */
.footer-grid--compact { grid-template-columns: minmax(0, 5fr) repeat(2, minmax(0, 2fr)); }
@media (max-width: 899px) { .footer-grid--compact { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 560px) { .footer-grid--compact { grid-template-columns: minmax(0, 1fr); } }


/* Low-emphasis portable build link: installer remains the primary action. */
.download-portable-wrap { margin: 4px 0 0; padding-top: 2px; }
.download-portable { display: inline-flex; flex-wrap: wrap; align-items: baseline; gap: 7px; max-width: 100%; color: var(--text-3); font-size: .88rem; line-height: 1.5; text-decoration: none; transition: color .18s ease, opacity .18s ease; }
.download-portable-label { text-decoration: underline; text-decoration-color: var(--line-2); text-underline-offset: 3px; }
.download-portable-note { color: var(--text-3); font-size: .82rem; opacity: .88; }
.download-portable::before { content: "↳"; opacity: .7; }
.download-portable:hover, .download-portable:focus-visible { color: var(--accent); }
.download-portable:hover .download-portable-label, .download-portable:focus-visible .download-portable-label { text-decoration-color: currentColor; }
.download-portable:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; border-radius: 3px; }
@media (max-width: 560px) { .download-portable { gap: 5px; } .download-portable-note { flex-basis: calc(100% - 18px); margin-left: 18px; } }


/* ---------- release file checksums ---------- */
.download-integrity {
  display: grid; gap: 7px; min-width: 0;
  margin: -2px 0 18px; padding: 12px 0 16px;
  border-bottom: 1px solid var(--line);
}
.download-integrity-label {
  color: var(--text-3); font-size: .69rem; font-weight: 700;
  line-height: 1.35; letter-spacing: .075em; text-transform: uppercase;
}
.download-integrity-value { display: flex; align-items: flex-start; gap: 8px; min-width: 0; }
.download-integrity-value code {
  display: block; flex: 1 1 auto; min-width: 0; padding: 9px 10px;
  border: 1px solid var(--line); border-radius: 6px;
  background: var(--bg-2); color: var(--text-2);
  font: .72rem/1.55 var(--mono); overflow-wrap: anywhere; word-break: break-all;
  user-select: all; -webkit-user-select: all;
}
.download-hash-copy {
  flex: none; min-height: 34px; padding: 0 10px;
  border: 1px solid var(--line-2); border-radius: 6px;
  background: transparent; color: var(--text-2);
  font: 600 .76rem/1 var(--font); cursor: pointer;
  transition: border-color .15s ease, color .15s ease, background-color .15s ease;
}
.download-hash-copy:hover, .download-hash-copy:focus-visible {
  border-color: var(--accent); color: var(--accent); background: var(--surface-2);
}
.download-hash-copy:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.download-integrity--portable {
  margin: 8px 0 18px 18px; padding: 0; border: 0; opacity: .88;
}
.download-integrity--portable .download-integrity-label { font-size: .65rem; letter-spacing: .055em; }
.download-integrity--portable .download-integrity-value code { font-size: .67rem; padding: 7px 8px; }
.download-integrity--portable .download-hash-copy { min-height: 31px; padding-inline: 8px; font-size: .72rem; }
@media (max-width: 560px) {
  .download-integrity-value { gap: 6px; }
  .download-integrity-value code { font-size: .66rem; padding: 8px; }
  .download-hash-copy { min-height: 33px; padding-inline: 8px; }
  .download-integrity--portable { margin-left: 18px; }
}


/* ---------- Web Edition embed (bue-online.html) ---------- */
.video--app { aspect-ratio: 16 / 10; }
@media (max-width: 560px) { .video--app { aspect-ratio: 4 / 5; } }