/* Reload OS website - the device's own palette (main/ros_services.c: PAL_DARK, PAL_LIGHT) */
:root {
  --bg: #0A0E17; --surface: #141A28; --surface2: #1E2638; --border: #2A3350; --text: #E8ECF5; --muted: #8A93A8;
  --dim: #4A5270; --accent: #FF6B35; --accent2: #2EC4B6; --ok: #3DDC84; --warn: #FFC145; --err: #FF4D6D;
  --code-bg: #0F1420; --glow: rgba(255, 107, 53, .16); --shadow: 0 10px 40px rgba(0, 0, 0, .45);
  --radius: 14px; --wrap: 1160px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "Sukhumvit Set", "Noto Sans Thai", "Leelawadee UI", Thonburi, Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  color-scheme: dark;
}
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #EEF2F7; --surface: #FFFFFF; --surface2: #E2E8F0; --border: #CBD5E1; --text: #1C2330; --muted: #5B6577;
    --dim: #A9B3C2; --accent: #F25C1F; --accent2: #0E9F95; --ok: #16A05A; --warn: #C98200; --err: #D93250;
    --code-bg: #F6F8FB; --glow: rgba(242, 92, 31, .12); --shadow: 0 10px 30px rgba(28, 35, 48, .12);
    color-scheme: light;
  }
}
:root[data-theme="light"] {
  --bg: #EEF2F7; --surface: #FFFFFF; --surface2: #E2E8F0; --border: #CBD5E1; --text: #1C2330; --muted: #5B6577;
  --dim: #A9B3C2; --accent: #F25C1F; --accent2: #0E9F95; --ok: #16A05A; --warn: #C98200; --err: #D93250;
  --code-bg: #F6F8FB; --glow: rgba(242, 92, 31, .12); --shadow: 0 10px 30px rgba(28, 35, 48, .12);
  color-scheme: light;
}

* { box-sizing: border-box; }
html { scroll-padding-top: 76px; -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.65 var(--font); }
html[lang="th"] body { line-height: 1.75; }
img { max-width: 100%; height: auto; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
code, pre { font-family: var(--mono); font-size: .88em; }
:not(pre) > code { background: var(--surface2); padding: .1em .35em; border-radius: 5px; overflow-wrap: anywhere; }
h1, h2, h3 { line-height: 1.25; margin: 0 0 .5em; }
h1 { font-size: clamp(2rem, 5vw, 3.2rem); letter-spacing: -.02em; }
h2 { font-size: clamp(1.5rem, 3vw, 2rem); letter-spacing: -.01em; }
h3 { font-size: 1.15rem; }
p { margin: 0 0 1em; }
.muted { color: var(--muted); }
.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 16px; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 16px; top: 8px; z-index: 99; background: var(--surface); padding: 8px 12px; border-radius: 8px; }

/* header */
.top { position: sticky; top: 0; z-index: 50; background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); border-bottom: 1px solid var(--border); }
.top-in { display: flex; align-items: center; gap: 16px; height: 60px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--text); font-weight: 700; font-size: 1.12rem; }
.brand:hover { text-decoration: none; }
.brand.small { font-size: 1rem; gap: 8px; }
.site-nav { margin-left: auto; display: flex; align-items: center; gap: 4px; }
.site-nav a { color: var(--muted); padding: 8px 12px; border-radius: 9px; font-weight: 500; }
.site-nav a:hover { color: var(--text); background: var(--surface); text-decoration: none; }
.site-nav a[aria-current] { color: var(--text); background: var(--surface2); }
.site-nav a.lang { border: 1px solid var(--border); padding: 5px 10px; margin-left: 6px; font-size: .9rem; }
.theme-btn, .menu-btn { background: none; border: 1px solid var(--border); color: var(--muted); border-radius: 9px;
  height: 34px; width: 36px; display: inline-grid; place-items: center; cursor: pointer; }
.theme-btn:hover { color: var(--text); }
.menu-btn { display: none; margin-left: auto; gap: 4px; padding: 9px 9px; }
.menu-btn span { display: block; height: 2px; width: 16px; background: currentColor; border-radius: 2px; }
@media (max-width: 760px) {
  .menu-btn { display: grid; }
  .site-nav { display: none; position: absolute; left: 0; right: 0; top: 60px; flex-direction: column; align-items: stretch;
    background: var(--bg); border-bottom: 1px solid var(--border); padding: 8px 16px 14px; }
  .site-nav.open { display: flex; }
  .site-nav a.lang { margin: 6px 0 0; text-align: center; }
  .theme-btn { margin-top: 6px; width: 100%; }
}

/* sections */
.sec { padding: 72px 0; }
.sec.alt { background: var(--surface); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.sec-head { max-width: 720px; margin-bottom: 36px; }
.eyebrow { color: var(--accent); font-weight: 600; font-size: .85rem; letter-spacing: .08em; text-transform: uppercase; margin-bottom: 8px; }
html[lang="th"] .eyebrow { letter-spacing: 0; text-transform: none; font-size: .95rem; }
.lead { font-size: 1.15rem; color: var(--muted); }
.page-head { padding: 64px 0 24px; }
.page-head .lead { max-width: 760px; }

/* hero */
.hero { position: relative; overflow: hidden; padding: 72px 0 64px; }
.hero::before { content: ""; position: absolute; inset: -40% -10% auto 40%; height: 700px;
  background: radial-gradient(closest-side, var(--glow), transparent); pointer-events: none; }
.hero-in { position: relative; display: grid; grid-template-columns: 1.02fr 1.25fr; gap: 48px; align-items: center; }
.hero h1 span { color: var(--accent); }
.th-words { word-break: keep-all; }                 /* Thai: break only at the <wbr>s between words */
html[lang="th"] .hero h1 { font-size: clamp(1.9rem, 4.4vw, 3rem); }
.hero .lead { max-width: 560px; }
.cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 12px 20px; border-radius: 11px; font-weight: 600;
  border: 1px solid var(--border); color: var(--text); background: var(--surface); }
.btn:hover { text-decoration: none; border-color: var(--muted); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { filter: brightness(1.08); }
@media (max-width: 900px) { .hero-in { grid-template-columns: 1fr; } .hero { padding-top: 48px; } }

/* a screen in a bezel */
.device { background: #05070C; border-radius: 22px; padding: 12px; box-shadow: var(--shadow), 0 0 0 1px #262D40 inset; }
.device img { display: block; border-radius: 6px; width: 100%; }
.device.small { border-radius: 18px; padding: 9px; }
figure { margin: 0; }
figcaption { color: var(--muted); font-size: .9rem; margin-top: 10px; text-align: center; }

/* stats */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-top: 44px; }
.stat { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px 18px; }
.stat b { display: block; font-size: 1.5rem; line-height: 1.2; }
.stat span { color: var(--muted); font-size: .92rem; }
@media (max-width: 760px) { .stats { grid-template-columns: repeat(2, 1fr); } }

/* cards */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; }
.sec.alt .card { background: var(--bg); }
.card h3 { margin-top: 14px; }
.card p:last-child, .card ul:last-child { margin-bottom: 0; }
.card ul { padding-left: 1.1em; margin: 0 0 1em; }
.card li { margin: .2em 0; }
.ico { width: 44px; height: 44px; border-radius: 12px; display: grid; place-items: center;
  background: color-mix(in srgb, var(--accent) 16%, transparent); }
.ico i { width: 26px; height: 26px; background: var(--accent); -webkit-mask: var(--i) center / contain no-repeat; mask: var(--i) center / contain no-repeat; }
.ico.teal { background: color-mix(in srgb, var(--accent2) 16%, transparent); }
.ico.teal i { background: var(--accent2); }

/* split: text beside pictures */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.split.rev > :first-child { order: 2; }
@media (max-width: 900px) { .split { grid-template-columns: 1fr; } .split.rev > :first-child { order: 0; } }
.phones { display: flex; gap: 14px; justify-content: center; align-items: flex-end; }
.phones figure { flex: 0 1 200px; min-width: 0; }
.shots { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 24px; }
.ticks { list-style: none; padding: 0; margin: 0 0 1em; }
.ticks li { position: relative; padding-left: 28px; margin: .45em 0; }
.ticks li::before { content: ""; position: absolute; left: 2px; top: .55em; width: 14px; height: 8px;
  border-left: 2.5px solid var(--ok); border-bottom: 2.5px solid var(--ok); transform: rotate(-45deg); }

/* badges */
.badge { display: inline-block; font-size: .75rem; font-weight: 600; padding: 2px 9px; border-radius: 99px;
  background: var(--surface2); color: var(--muted); white-space: nowrap; vertical-align: middle; font-family: var(--font); }
.badge.ok { background: color-mix(in srgb, var(--ok) 18%, transparent); color: var(--ok); }
.badge.accent { background: color-mix(in srgb, var(--accent) 18%, transparent); color: var(--accent); }
.badge.teal { background: color-mix(in srgb, var(--accent2) 18%, transparent); color: var(--accent2); }
.badge.warn { background: color-mix(in srgb, var(--warn) 18%, transparent); color: var(--warn); }
.next { font-size: .72rem; }

/* boards */
.boards { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(330px, 100%), 1fr)); gap: 16px; }
.board { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; display: flex; flex-direction: column; }
.board header { display: flex; justify-content: space-between; gap: 10px; align-items: flex-start; margin-bottom: 4px; }
.board h3 { margin: 0; }
.board .maker { color: var(--muted); font-size: .9rem; margin: 0 0 14px; }
.board dl { display: grid; grid-template-columns: 96px 1fr; gap: 6px 12px; margin: 0; font-size: .94rem; }
.board dt { color: var(--muted); }
.board dd { margin: 0; }
.board .note { margin: 14px 0 0; padding-top: 12px; border-top: 1px solid var(--border); color: var(--muted); font-size: .9rem; }
.legend { display: flex; flex-wrap: wrap; gap: 10px 18px; margin: 0 0 24px; color: var(--muted); font-size: .92rem; }

/* tables */
.table { overflow-x: auto; margin: 0 0 1.4em; border: 1px solid var(--border); border-radius: 10px; }
table { border-collapse: collapse; width: 100%; font-size: .93rem; }
th, td { text-align: left; padding: 9px 12px; border-bottom: 1px solid var(--border); vertical-align: top; }
th { background: var(--surface2); font-weight: 600; white-space: nowrap; }
tr:last-child td { border-bottom: 0; }

/* code */
pre.code { background: var(--code-bg); border: 1px solid var(--border); border-radius: 10px; padding: 14px 16px; overflow-x: auto;
  line-height: 1.55; margin: 0 0 1.2em; }
pre.code code { font-size: .86rem; white-space: pre; }
.c-k { color: #C792EA; } .c-t { color: var(--accent2); } .c-s { color: #C3E88D; } .c-c { color: var(--muted); font-style: italic; }
.c-n { color: #F78C6C; } .c-p { color: #FFCB6B; } .c-f { color: #82AAFF; }
:root[data-theme="light"] .c-k { color: #7C3AED; } :root[data-theme="light"] .c-s { color: #3F7A1A; }
:root[data-theme="light"] .c-n { color: #B4541B; } :root[data-theme="light"] .c-p { color: #9A6700; } :root[data-theme="light"] .c-f { color: #1D4ED8; }
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) .c-k { color: #7C3AED; } :root:not([data-theme="dark"]) .c-s { color: #3F7A1A; }
  :root:not([data-theme="dark"]) .c-n { color: #B4541B; } :root:not([data-theme="dark"]) .c-p { color: #9A6700; }
  :root:not([data-theme="dark"]) .c-f { color: #1D4ED8; }
}

/* steps */
.steps { counter-reset: s; display: grid; grid-template-columns: minmax(0, 1fr); gap: 14px; padding: 0; margin: 0 0 1.5em; list-style: none; }
.steps > li { counter-increment: s; position: relative; padding: 16px 18px 16px 62px; background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--radius); }
.steps > li::before { content: counter(s); position: absolute; left: 18px; top: 15px; width: 30px; height: 30px; border-radius: 50%;
  background: var(--accent); color: #fff; font-weight: 700; display: grid; place-items: center; font-size: .95rem; }
.steps pre.code { margin: 10px 0 0; }
.steps p { margin: 0; }

/* download box */
.download { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px;
  display: grid; grid-template-columns: 1fr auto; gap: 16px 24px; align-items: center; margin: 0 0 1.5em; }
.download h3 { margin: 0 0 4px; }
.download .sha { font-family: var(--mono); font-size: .8rem; color: var(--muted); overflow-wrap: anywhere; grid-column: 1 / -1; }
@media (max-width: 600px) { .download { grid-template-columns: 1fr; } }
.callout { border-left: 3px solid var(--accent); background: var(--surface); padding: 14px 18px; border-radius: 0 10px 10px 0; margin: 0 0 1.4em; }
.callout.teal { border-color: var(--accent2); }

/* developer docs */
.docs { max-width: var(--wrap); margin: 0 auto; padding: 32px 16px 64px; display: grid; grid-template-columns: 250px minmax(0, 1fr); gap: 40px; }
.docs-side { position: sticky; top: 76px; align-self: start; max-height: calc(100vh - 92px); overflow-y: auto; font-size: .92rem; padding-bottom: 20px; }
.docs-side ul { list-style: none; padding: 0; margin: 0 0 22px; }
.docs-side li a { display: block; padding: 4px 10px; border-radius: 7px; color: var(--muted); }
.docs-side li a:hover { color: var(--text); background: var(--surface); text-decoration: none; }
.docs-side .docs-nav a { color: var(--text); font-weight: 500; }
.docs-side .docs-nav a[aria-current] { background: var(--surface2); color: var(--accent); }
.docs-side li.l3 a { padding-left: 24px; font-size: .88rem; }
.toc-title { font-size: .75rem; font-weight: 700; color: var(--dim); text-transform: uppercase; letter-spacing: .08em; margin: 0 0 6px 10px; }
.docs-main { min-width: 0; overflow-wrap: break-word; }
.docs-main h1 { font-size: 2.2rem; }
.docs-main h2 { font-size: 1.5rem; margin-top: 1.8em; padding-top: .4em; }
.docs-main h3 { margin-top: 1.5em; }
.docs-main ul { padding-left: 1.3em; }
.docs-main li { margin: .35em 0; }
.docs-main blockquote { margin: 0 0 1em; padding: 8px 16px; border-left: 3px solid var(--border); color: var(--muted); }
.anchor { float: left; margin-left: -1.1em; width: 1.1em; color: var(--dim); opacity: 0; font-weight: 400; }
h2:hover .anchor, h3:hover .anchor { opacity: 1; text-decoration: none; }
@media (max-width: 900px) {
  .docs { grid-template-columns: 1fr; gap: 8px; padding-top: 20px; }
  .docs-side { position: static; max-height: none; border-bottom: 1px solid var(--border); }
  .docs-side .doc-toc { display: none; }
  .docs-side .docs-nav { display: flex; flex-wrap: wrap; gap: 4px; }
}

/* API reference */
.api-search { position: sticky; top: 60px; z-index: 5; background: var(--bg); padding: 10px 0; margin-bottom: 8px; display: flex; gap: 12px; align-items: center; }
.api-search input { flex: 1; min-width: 0; font: inherit; padding: 10px 14px; border-radius: 10px; border: 1px solid var(--border);
  background: var(--surface); color: var(--text); }
.api-search input:focus { outline: 2px solid var(--accent); outline-offset: -1px; }
.api-sec { scroll-margin-top: 70px; }
.api-sec h2 { border-bottom: 1px solid var(--border); padding-bottom: .3em; }
.api-entry { border: 1px solid var(--border); border-radius: 12px; padding: 14px 16px 2px; margin: 0 0 12px; background: var(--surface); }
.api-entry:has(:target) { border-color: var(--accent); box-shadow: 0 0 0 3px var(--glow); }
.api-head { display: flex; gap: 4px 14px; align-items: center; flex-wrap: wrap; margin-bottom: 8px; }
.api-name { font-family: var(--mono); font-weight: 600; font-size: .92rem; color: var(--text); overflow-wrap: anywhere; scroll-margin-top: 130px; }
.api-name:target { color: var(--accent); }
.api-entry pre.code { margin-bottom: 10px; background: var(--code-bg); }
.api-entry p { font-size: .94rem; }
.api-note { color: var(--muted); font-size: .94rem; }
.api-hidden { color: var(--dim); font-size: .85rem; }
.api-hidden code { background: none; padding: 0; color: var(--dim); }
.api-group { border: 1px solid var(--border); border-radius: 10px; padding: 10px 14px; margin: 0 0 10px; background: var(--surface); }
.api-group summary { cursor: pointer; font-weight: 600; }
.api-group .names { margin: 10px 0 4px; line-height: 2; font-size: .85rem; }
.api-group .names code { margin-right: 4px; }
.hide { display: none !important; }

/* footer */
.foot { border-top: 1px solid var(--border); padding: 28px 0 36px; font-size: .93rem; }
.foot-in { display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap; }
.foot p { margin: 8px 0 0; }
.foot-links { display: flex; flex-wrap: wrap; gap: 4px 16px; align-items: center; }
.foot-links a { color: var(--muted); }
.foot-links a[aria-current] { color: var(--text); }

/* icons: the device's own drawings (main/assets/icons) and a few more, tinted by the mask */
.i-chip { --i: url(icons/chip.png); }
.i-database { --i: url(icons/database.png); } .i-globe { --i: url(icons/globe.png); }
.i-heartbeat { --i: url(icons/heartbeat.png); } .i-hotspot { --i: url(icons/hotspot.png); } .i-idcard { --i: url(icons/idcard.png); }
.i-screen { --i: url(icons/screen.png); }
.i-stopwatch { --i: url(icons/stopwatch.png); } .i-usb { --i: url(icons/usb.svg); } .i-apps { --i: url(icons/apps.svg); }
.i-shield { --i: url(icons/shield.svg); } .i-code { --i: url(icons/code.svg); } .i-qr { --i: url(icons/qr.svg); }
.i-factory { --i: url(icons/factory.svg); } .i-key { --i: url(icons/key.svg); } .i-refresh { --i: url(icons/refresh.svg); }

/* Try it: the real UI as WebAssembly in a canvas (assets/try.js, tools/sim/web.sh) */
.sim-pick { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 18px; }
.sim-pick a, .sim-restart { padding: 8px 14px; border-radius: 99px; border: 1px solid var(--border); color: var(--text);
  background: var(--surface); font: inherit; font-size: .95rem; cursor: pointer; }
.sim-pick a:hover, .sim-restart:hover { text-decoration: none; border-color: var(--muted); }
.sim-pick a[aria-current] { background: var(--accent); border-color: var(--accent); color: #fff; }
.sim-restart { margin-left: auto; color: var(--muted); }
.sim-stage { display: flex; justify-content: center; margin: 0 0 28px; }
.sim-device { position: relative; width: min(100%, max(260px, calc((100vh - 230px) * var(--sw) / var(--sh) + 24px))); }
.sim-device.wide { max-width: 1060px; }
.sim-device canvas { display: block; width: 100% !important; height: auto !important; aspect-ratio: var(--sw) / var(--sh);
  border-radius: 6px; background: #000; touch-action: none; outline: none; -webkit-user-select: none; user-select: none; }
.sim-load { position: absolute; inset: 12px; display: grid; place-items: center; text-align: center; padding: 16px;
  border-radius: 6px; background: #05070C; color: #8A93A8; }
.sim-load.done { display: none; }
.sim-load.err { color: var(--warn); }
.sim-notes { margin-top: 8px; }
kbd { font-family: var(--mono); font-size: .85em; padding: 1px 6px; border: 1px solid var(--border); border-bottom-width: 2px;
  border-radius: 5px; background: var(--surface); }