/* Yiemy — the app's IDE dark theme (ASOWorkbench/DesignSystem/DSTokens.swift),
   carried to the web. Ramps run from the ground up: 100 is nearest the ground,
   900 nearest the ink. The accent marks selection, focus and gains only. */
:root {
  --bg: #1E1F24;        /* editor ground */
  --surface: #191A1F;   /* explorer, tabs, panel */
  --chrome: #141519;    /* titlebar, activity bar, the page itself */
  --text: #D6D9DF;
  --accent: #5FA0F5;
  --divider: rgba(255, 255, 255, .08);
  --status: #2A64B4; --status-busy: #8A5A1E; --status-text: #F2F6FC;

  --n100: #24262C; --n200: #2C2E35; --n300: #373A42; --n400: #4B4F59; --n500: #686C77;
  --n600: #8B8F99; --n700: #A9ADB7; --n800: #C6C9D1; --n900: #E2E4E9;
  --a100: #1A2638; --a200: #1E3150; --a300: #26436E; --a400: #2F5A96; --a500: #3A73C2;
  --a600: #4C8BE0; --a700: #5FA0F5; --a800: #8DBBFA; --a900: #C4DCFF;

  --easy: #4FC98A; --moderate: #E3C15A; --hard: #EE8A45; --severe: #EE5D5D; --info: #6FB7F2;

  --sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", Inter, "Segoe UI", system-ui, sans-serif;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  --r-sm: 2px; --r-md: 3px; --r-lg: 5px; --r-win: 10px;
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, .5);
  --ease: cubic-bezier(.22, 1, .36, 1);
  color-scheme: dark;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 64px; -webkit-text-size-adjust: 100%; }
body { background: var(--chrome); color: var(--text); font: 15px/1.6 var(--sans); -webkit-font-smoothing: antialiased; overflow-x: hidden; }
a { color: var(--a800); text-decoration: none; }
a:hover { color: var(--a900); }
button, input, textarea { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: 0; }
::selection { background: var(--a300); color: var(--n900); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.ic { display: inline-block; flex: none; vertical-align: -2px; }
.wrap { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.hl { color: var(--accent); }
.dim { color: var(--n500); }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } *, *::before, *::after { animation: none !important; transition: none !important; } }

/* ---------- buttons: accent text on an accent border, like DSButtonStyle ---------- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; height: 38px; padding: 0 16px; border: 1px solid var(--n300); border-radius: var(--r-md); color: var(--n900); font-size: 14px; font-weight: 500; white-space: nowrap; transition: background .12s, border-color .12s, color .12s; }
.btn:hover { background: var(--n100); border-color: var(--n400); color: var(--n900); }
.btn:active { background: var(--n200); }
.btn-primary { border-color: var(--a600); color: var(--a800); background: var(--a100); }
.btn-primary:hover { background: var(--a200); border-color: var(--a700); color: var(--a900); }
.btn-primary:active { background: var(--a300); }
.btn-sm { height: 30px; padding: 0 12px; font-size: 13px; }
.btn-block { width: 100%; }
.btn.soon, .btn.soon:hover, .btn.soon:active { cursor: default; opacity: .7; background: transparent; border-color: var(--n300); color: var(--n700); }

/* ---------- nav ---------- */
.nav { position: sticky; top: 0; z-index: 20; background: rgba(20, 21, 25, .86); backdrop-filter: saturate(160%) blur(12px); -webkit-backdrop-filter: saturate(160%) blur(12px); border-bottom: 1px solid var(--divider); }
.nav-in { display: flex; align-items: center; gap: 28px; height: 52px; }
.brand { display: flex; align-items: center; gap: 9px; color: var(--n900); font: 600 16px var(--mono); letter-spacing: -.02em; }
.brand:hover { color: var(--n900); }
.brand img { border-radius: 5px; }
.nav nav { display: flex; gap: 4px; margin-left: auto; }
.nav nav a { color: var(--n600); font-size: 13px; padding: 5px 10px; border-radius: var(--r-md); font-family: var(--mono); }
.nav nav a:hover { color: var(--n900); background: var(--n100); }
@media (max-width: 720px) { .nav nav { display: none; } .nav .btn { margin-left: auto; } }

/* ---------- hero ---------- */
.hero { padding-top: 72px; padding-bottom: 24px; }
.hero-copy { max-width: 760px; margin: 0 auto 44px; text-align: center; }
.eyebrow { display: inline-flex; align-items: center; gap: 9px; font: 12px var(--mono); color: var(--n700); border: 1px solid var(--divider); background: var(--surface); padding: 5px 12px; border-radius: 999px; margin-bottom: 24px; }
.pulse { width: 7px; height: 7px; border-radius: 50%; background: var(--easy); box-shadow: 0 0 0 0 rgba(79, 201, 138, .6); animation: pulse 2.2s infinite; }
@keyframes pulse { 70% { box-shadow: 0 0 0 7px rgba(79, 201, 138, 0); } 100% { box-shadow: 0 0 0 0 rgba(79, 201, 138, 0); } }
h1 { font-size: clamp(36px, 6.2vw, 64px); line-height: 1.04; font-weight: 600; letter-spacing: -.032em; color: var(--n900); }
.lede { font-size: 17px; color: var(--n700); max-width: 600px; margin: 20px auto 0; }
.cta { display: flex; gap: 10px; justify-content: center; margin-top: 28px; flex-wrap: wrap; }
.cta .btn { height: 42px; padding: 0 20px; font-size: 15px; }
.clients { margin-top: 22px; font-size: 13px; color: var(--n500); display: flex; gap: 6px 14px; justify-content: center; flex-wrap: wrap; }
.clients span { color: var(--n700); font-family: var(--mono); font-size: 12px; }

/* ---------- the IDE window ---------- */
.ide { position: relative; border: 1px solid var(--n300); border-radius: var(--r-win); overflow: hidden; background: var(--bg); box-shadow: 0 0 0 1px rgba(0, 0, 0, .4), 0 40px 100px -20px rgba(0, 0, 0, .7), 0 0 120px -30px rgba(95, 160, 245, .18); font-size: 13px; }
.ide-title { height: 32px; display: flex; align-items: center; gap: 12px; padding: 0 12px; background: var(--chrome); border-bottom: 1px solid var(--divider); }
.lights { display: flex; gap: 8px; } .lights i { width: 12px; height: 12px; border-radius: 50%; background: #FF5F57; }
.lights i:nth-child(2) { background: #FEBC2E; } .lights i:nth-child(3) { background: #28C840; }
.ide-name { position: absolute; left: 50%; transform: translateX(-50%); font-size: 12px; color: var(--n600); white-space: nowrap; }
.ide-hint { margin-left: auto; font: 11px var(--mono); color: var(--n500); }
.ide-body { display: grid; grid-template-columns: 46px 232px minmax(0, 1fr); height: 640px; }

.activity { background: var(--chrome); border-right: 1px solid var(--divider); display: flex; flex-direction: column; align-items: center; padding: 6px 0; gap: 2px; }
.activity button { position: relative; width: 46px; height: 40px; display: grid; place-items: center; color: var(--n500); transition: color .12s; }
.activity button:hover { color: var(--n800); }
.activity button.on { color: var(--text); }
.activity button.on::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 2px; background: var(--accent); }
.activity hr { width: 22px; border: 0; border-top: 1px solid var(--divider); margin: 6px 0; }
.activity .foot-item { margin-top: auto; }

.explorer { background: var(--surface); border-right: 1px solid var(--divider); overflow: auto; font-size: 12.5px; scrollbar-width: thin; }
.ex-head { height: 34px; display: flex; align-items: center; padding: 0 8px 0 14px; font-size: 10.5px; font-weight: 600; letter-spacing: .06em; text-transform: uppercase; color: var(--n600); }
.ex-head span { margin-right: auto; }
.ex-head button { width: 22px; height: 22px; display: grid; place-items: center; color: var(--n600); border-radius: var(--r-md); }
.ex-head button:hover { background: var(--n200); color: var(--n900); }
.ex-sec > summary { list-style: none; display: flex; align-items: center; gap: 4px; height: 24px; padding: 0 12px 0 6px; font-size: 10.5px; font-weight: 700; letter-spacing: .05em; text-transform: uppercase; color: var(--n800); cursor: pointer; }
.ex-sec > summary::-webkit-details-marker { display: none; }
.ex-sec > summary .ic { color: var(--n600); transition: transform .14s; transform: rotate(-90deg); }
.ex-sec[open] > summary .ic { transform: none; }
.ex-sec > summary b { margin-left: auto; font: 500 9.5px var(--mono); color: var(--n600); background: var(--n200); padding: 1px 5px; border-radius: 99px; }
.ex-row { display: flex; align-items: center; gap: 6px; width: 100%; height: 24px; padding: 0 10px 0 calc(20px + var(--d, 0) * 14px); color: var(--n800); text-align: left; transition: background .12s; }
.ex-row:hover { background: var(--n100); }
.ex-row.on { background: var(--a100); color: var(--n900); box-shadow: inset 1px 0 0 var(--accent); }
.ex-row .ic { color: var(--n500); }
.ex-row.app .ic { color: var(--a700); }
.ex-row.muted { color: var(--n500); }
.ex-row .t { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.ex-row .r { font: 10.5px var(--mono); color: var(--n700); display: flex; gap: 6px; }

.editor { display: flex; flex-direction: column; min-width: 0; min-height: 0; background: var(--bg); }
.tabs { display: flex; height: 34px; flex: none; background: var(--surface); border-bottom: 1px solid var(--divider); overflow-x: auto; scrollbar-width: none; }
.tabs::-webkit-scrollbar { display: none; }
.tab { position: relative; display: flex; align-items: center; gap: 7px; padding: 0 6px 0 12px; height: 34px; flex: none; border-right: 1px solid var(--divider); color: var(--n600); font-size: 12px; cursor: pointer; animation: tabIn .18s var(--ease); }
@keyframes tabIn { from { opacity: 0; transform: translateY(4px); } }
.tab:hover { background: var(--n100); }
.tab .ic { color: var(--n600); }
.tab.on { background: var(--bg); color: var(--n900); margin-bottom: -1px; height: 35px; }
.tab.on::before { content: ""; position: absolute; left: 0; right: 0; top: 0; height: 1.5px; background: var(--accent); }
.tab.on > .ic { color: var(--a700); }
.tab .close { width: 16px; height: 16px; display: grid; place-items: center; border-radius: var(--r-sm); color: var(--n700); opacity: 0; }
.tab.on .close, .tab:hover .close { opacity: 1; }
.tab .close:hover { background: var(--n200); }
.crumbs { height: 26px; flex: none; display: flex; align-items: center; gap: 5px; padding: 0 16px; font-size: 11.5px; color: var(--n600); border-bottom: 1px solid var(--divider); white-space: nowrap; overflow: hidden; }
.crumbs .cur { color: var(--n800); }
.crumbs code { font: 11px var(--mono); }
.crumbs > .ic { color: var(--n500); }

.view { flex: 1; min-height: 0; overflow: auto; padding: 18px 22px; scrollbar-width: thin; }
.view.enter { animation: viewIn .2s ease-out; }
@keyframes viewIn { from { opacity: 0; transform: translateX(6px); } }
.v-title { font-size: 20px; font-weight: 600; letter-spacing: -.01em; color: var(--n900); }
.v-sub { font-size: 12px; color: var(--n600); margin: 2px 0 14px; }
.v-sub code, .v-foot code { font: 11.5px var(--mono); color: var(--n700); }
.v-foot { margin-top: 12px; font-size: 11px; color: var(--n500); display: flex; justify-content: space-between; gap: 12px; }
.eyebrow-s { font-size: 10.5px; font-weight: 600; letter-spacing: .06em; text-transform: uppercase; color: var(--n600); margin: 16px 0 8px; }

.metrics { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 8px; }
.metric { border: 1px solid var(--divider); border-radius: var(--r-lg); padding: 10px 12px; background: var(--surface); }
.metric span { font-size: 11px; color: var(--n600); }
.metric b { display: block; font: 500 22px var(--mono); color: var(--n900); letter-spacing: -.02em; margin-top: 2px; }
.metric small { font: 11px var(--mono); }
.brief { border: 1px solid var(--divider); border-radius: var(--r-lg); overflow: hidden; }
.brief li { list-style: none; display: flex; gap: 10px; align-items: baseline; padding: 8px 12px; border-bottom: 1px solid var(--divider); font-size: 12.5px; color: var(--n800); animation: rowIn .25s ease-out backwards; }
.brief li:last-child { border-bottom: 0; }
.brief li > b:first-child { width: 12px; flex: none; font: 600 12px var(--mono); text-align: center; }
.brief li strong { color: var(--n900); font-weight: 600; }
@keyframes rowIn { from { opacity: 0; transform: translateY(3px); } }

.tbl { width: 100%; border-collapse: collapse; font-size: 12.5px; }
.tbl th { text-align: right; font-size: 10.5px; font-weight: 600; letter-spacing: .04em; text-transform: uppercase; color: var(--n600); padding: 0 10px 7px; border-bottom: 1px solid var(--divider); white-space: nowrap; }
.tbl th:first-child, .tbl td:first-child { text-align: left; padding-left: 8px; }
.tbl th.hi { color: var(--a800); }
.tbl td { padding: 7px 10px; border-bottom: 1px solid var(--divider); text-align: right; white-space: nowrap; color: var(--n800); }
.tbl td.l { text-align: left; white-space: normal; color: var(--n600); font-size: 12px; }
.tbl tbody tr { transition: background .12s; animation: rowIn .25s ease-out backwards; }
.tbl tbody tr:hover { background: var(--n100); }
.tbl tr.focus td:first-child { color: var(--n900); font-weight: 500; }
.num { font-family: var(--mono); font-variant-numeric: tabular-nums; font-size: 12px; }
.est { font: 9px var(--mono); color: var(--n500); border: 1px solid var(--n300); border-radius: 2px; padding: 0 3px; margin-left: 4px; vertical-align: 1px; }
.diff { display: inline-flex; align-items: center; gap: 7px; }
.diff i { display: block; width: 46px; height: 4px; border-radius: 2px; background: var(--n200); overflow: hidden; }
.diff i::before { content: ""; display: block; height: 100%; width: var(--v); background: var(--c); }
.opp { color: var(--a800); font-weight: 500; }
.pill { display: inline-block; font: 500 10.5px var(--mono); padding: 1px 7px; border-radius: 99px; border: 1px solid; }
.pill.trial { color: var(--info); border-color: rgba(111, 183, 242, .35); background: rgba(111, 183, 242, .08); }
.pill.ok { color: var(--easy); border-color: rgba(79, 201, 138, .35); background: rgba(79, 201, 138, .08); }
.pill.no { color: var(--n600); border-color: var(--n300); }
.pill.warn { color: var(--moderate); border-color: rgba(227, 193, 90, .35); background: rgba(227, 193, 90, .08); }
.g { color: var(--easy); } .y { color: var(--moderate); } .o { color: var(--hard); } .r { color: var(--severe); } .b { color: var(--info); }
.a { color: var(--a800); } .f { color: var(--n500); } .m { color: var(--n600); } .w { color: var(--n900); }
.measuring { color: var(--n500); animation: blink 1s infinite; }
@keyframes blink { 50% { opacity: .4; } }
.spark { display: block; }

.chart { width: 100%; height: auto; max-height: 250px; display: block; }
.chart text { font: 11px var(--mono); }
.chart .ln { stroke-dasharray: 1; stroke-dashoffset: 1; animation: draw 1.1s var(--ease) forwards; }
@keyframes draw { to { stroke-dashoffset: 0; } }
@media (prefers-reduced-motion: reduce) { .chart .ln { stroke-dashoffset: 0; } }
.legend { display: flex; flex-wrap: wrap; gap: 6px 16px; font: 11.5px var(--mono); color: var(--n700); margin-top: 8px; }
.legend i { display: inline-block; width: 10px; height: 2px; vertical-align: 3px; margin-right: 6px; }

.meta-f { border: 1px solid var(--divider); border-radius: var(--r-lg); padding: 9px 12px; margin-bottom: 8px; background: var(--surface); }
.meta-f span { display: flex; justify-content: space-between; font-size: 10.5px; font-weight: 600; letter-spacing: .05em; text-transform: uppercase; color: var(--n600); }
.meta-f span b { font: 400 11px var(--mono); letter-spacing: 0; }
.meta-f div { font-size: 14px; color: var(--n900); margin-top: 3px; min-height: 21px; }
.meta-f.kw div { font: 12.5px/1.55 var(--mono); word-break: break-all; }
.meta-f .caret, .caret { display: inline-block; width: 7px; height: 1.1em; background: var(--accent); vertical-align: -2px; margin-left: 1px; animation: caret 1s steps(1) infinite; }
@keyframes caret { 50% { opacity: 0; } }
.bar { height: 4px; border-radius: 2px; background: var(--n200); margin-top: 8px; overflow: hidden; }
.bar i { display: block; height: 100%; background: var(--accent); transition: width .2s; }
.chips { display: flex; gap: 6px; flex-wrap: wrap; }

.log li { list-style: none; display: grid; grid-template-columns: 82px 128px 1fr; gap: 10px; padding: 7px 8px; border-bottom: 1px solid var(--divider); font-size: 12.5px; animation: rowIn .25s ease-out backwards; }
.log li time, .log li code { font: 11.5px var(--mono); }
.log li time { color: var(--n500); }
.empty { display: grid; place-items: center; height: 100%; text-align: center; color: var(--n500); }
.empty b { font: 600 30px var(--mono); color: var(--n300); display: block; margin-bottom: 10px; letter-spacing: -.02em; }
.keycap { font: 10.5px var(--mono); border: 1px solid var(--n300); border-bottom-width: 2px; border-radius: 3px; padding: 0 5px; color: var(--n700); }

/* bottom panel */
.panel { height: 196px; flex: none; display: flex; flex-direction: column; background: var(--surface); border-top: 1px solid var(--divider); }
.panel-tabs { height: 30px; flex: none; display: flex; align-items: center; gap: 2px; padding: 0 10px; }
.panel-tabs button { height: 30px; padding: 0 9px; font-size: 10.5px; font-weight: 600; letter-spacing: .06em; text-transform: uppercase; color: var(--n600); border-bottom: 1px solid transparent; display: flex; align-items: center; gap: 6px; }
.panel-tabs button:hover { color: var(--n900); }
.panel-tabs button.on { color: var(--n900); border-bottom-color: var(--accent); }
.panel-tabs button b { font: 500 9.5px var(--mono); letter-spacing: 0; background: var(--n200); color: var(--n800); padding: 0 5px; border-radius: 99px; }
.panel-meta { margin-left: auto; font: 11px var(--mono); color: var(--n500); }
.panel-body { flex: 1; min-height: 0; overflow: auto; padding: 4px 14px 0; font: 12px/1.6 var(--mono); scrollbar-width: thin; }
.panel-body pre { font: inherit; white-space: pre-wrap; word-break: break-word; min-height: 1.6em; }
.panel-body .in { color: var(--n900); }
.panel-body .in::before { content: "❯ "; color: var(--accent); }
.prob { display: flex; gap: 8px; align-items: baseline; font-family: var(--sans); font-size: 12.5px; padding: 3px 0; }
.prob .ic { vertical-align: -2px; }
.term-input { display: flex; align-items: center; gap: 8px; padding: 4px 14px 8px; font: 12px var(--mono); }
.ps1 { color: var(--n600); white-space: nowrap; }
.ps1 span { color: var(--accent); }
.term-input input { flex: 1; min-width: 0; background: transparent; border: 0; outline: 0; font: 12px var(--mono); color: var(--n900); caret-color: var(--accent); }
.term-input input::placeholder { color: var(--n400); }

/* status bar */
.status { height: 22px; display: flex; align-items: stretch; background: var(--status); color: var(--status-text); font-size: 11px; transition: background .16s; overflow: hidden; }
.status.busy { background: var(--status-busy); }
.status > * { display: flex; align-items: center; gap: 4px; padding: 0 8px; white-space: nowrap; }
.status button:hover { background: rgba(255, 255, 255, .1); }
.status .sp { flex: 1; padding: 0; }
.spin { width: 9px; height: 9px; border: 1.5px solid rgba(255, 255, 255, .35); border-top-color: #fff; border-radius: 50%; animation: spin .7s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

.try { display: flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: 6px; margin-top: 18px; font: 12px var(--mono); }
.try > span { color: var(--n500); margin-right: 4px; }
.try button { padding: 4px 10px; border: 1px solid var(--divider); border-radius: var(--r-md); color: var(--n700); background: var(--surface); transition: all .12s; }
.try button:hover { border-color: var(--a500); color: var(--a900); }
.try button.on { border-color: var(--accent); color: var(--a900); background: var(--a100); }

@media (max-width: 960px) {
  .ide-body { grid-template-columns: 46px minmax(0, 1fr); }
  .explorer { display: none; }
  .ide-hint { display: none; }
}
@media (max-width: 640px) {
  .hero { padding-top: 48px; }
  .ide-body { grid-template-columns: minmax(0, 1fr); height: 640px; }
  .activity { display: none; }
  .ide-name { position: static; transform: none; margin-left: auto; margin-right: auto; }
  .view { padding: 14px; }
  .metrics { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .tbl .hide-s { display: none; }
  .status .hide-s { display: none; }
  .log li { grid-template-columns: 1fr; gap: 0; }
}

/* ---------- sections ---------- */
.sec { padding-top: 112px; }
.sec-head { max-width: 680px; margin-bottom: 36px; }
.sec-n { font: 12px var(--mono); color: var(--accent); margin-bottom: 12px; }
h2 { font-size: clamp(28px, 4.2vw, 42px); line-height: 1.1; font-weight: 600; letter-spacing: -.028em; color: var(--n900); }
.sec-head p:last-child:not(.sec-n) { color: var(--n700); font-size: 16px; margin-top: 14px; }

/* video player */
.player { position: relative; border: 1px solid var(--n300); border-radius: var(--r-win); overflow: hidden; background: #000; box-shadow: var(--shadow-lg); }
.player video { display: block; width: 100%; aspect-ratio: 16 / 9; background: var(--bg); }
.vbar { display: flex; align-items: center; gap: 12px; height: 38px; padding: 0 12px; background: var(--surface); border-top: 1px solid var(--divider); }
.vplay { width: 26px; height: 26px; display: grid; place-items: center; color: var(--n900); border-radius: var(--r-md); }
.vplay:hover { background: var(--n200); }
.scrub { position: relative; flex: 1; height: 18px; cursor: pointer; }
.scrub::before { content: ""; position: absolute; left: 0; right: 0; top: 7px; height: 4px; border-radius: 2px; background: var(--n200); }
.scrub > i { position: absolute; left: 0; top: 7px; height: 4px; border-radius: 2px; background: var(--accent); width: 0; }
.scrub > i::after { content: ""; position: absolute; right: -5px; top: -3px; width: 10px; height: 10px; border-radius: 50%; background: var(--a900); opacity: 0; transition: opacity .12s; }
.scrub:hover > i::after { opacity: 1; }
.ticks i { position: absolute; top: 5px; width: 2px; height: 8px; background: var(--chrome); }
.vtime { font: 11.5px var(--mono); color: var(--n600); font-variant-numeric: tabular-nums; }
.chapters { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 6px; margin-top: 12px; list-style: none; }
.chapters button { width: 100%; text-align: left; padding: 9px 12px; border: 1px solid var(--divider); border-radius: var(--r-md); color: var(--n600); font-size: 13px; background: var(--surface); position: relative; overflow: hidden; transition: border-color .12s, color .12s; }
.chapters button b { display: block; font: 500 11px var(--mono); color: var(--n500); margin-bottom: 1px; }
.chapters button:hover { color: var(--n900); border-color: var(--n400); }
.chapters button.on { color: var(--n900); border-color: var(--a400); background: var(--a100); }
.chapters button.on b { color: var(--a800); }
@media (max-width: 860px) { .chapters { grid-template-columns: repeat(3, minmax(0, 1fr)); } }

/* tool groups */
.groups { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px; background: var(--divider); border: 1px solid var(--divider); border-radius: var(--r-win); overflow: hidden; }
.group { background: var(--bg); padding: 22px 22px 20px; transition: background .12s; }
.group:hover { background: #202127; }
.group h3 { display: flex; align-items: center; gap: 9px; font-size: 15px; font-weight: 600; color: var(--n900); }
.group h3 .ic { color: var(--a700); }
.group p { font-size: 13.5px; color: var(--n600); margin: 6px 0 14px; }
.group code { display: inline-block; font: 11.5px var(--mono); color: var(--n800); background: var(--n100); border: 1px solid var(--divider); border-radius: var(--r-sm); padding: 1px 6px; margin: 0 4px 5px 0; }
@media (max-width: 900px) { .groups { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 580px) { .groups { grid-template-columns: minmax(0, 1fr); } }

/* packer */
.pane { border: 1px solid var(--n300); border-radius: var(--r-win); overflow: hidden; background: var(--bg); box-shadow: var(--shadow-lg); }
.pane-tabs { display: flex; align-items: stretch; height: 34px; background: var(--surface); border-bottom: 1px solid var(--divider); font-size: 12px; }
.pane-tabs span { display: flex; align-items: center; gap: 7px; padding: 0 14px; }
.pane-tabs .on { background: var(--bg); color: var(--n900); box-shadow: inset 0 1.5px 0 var(--accent); border-right: 1px solid var(--divider); }
.pane-tabs .on .ic { color: var(--a700); }
.pane-tabs .dim { margin-left: auto; font: 11px var(--mono); }
.pack-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr); }
.pack-in { padding: 20px; border-right: 1px solid var(--divider); display: flex; flex-direction: column; gap: 14px; }
.pack-out { padding: 20px; display: flex; flex-direction: column; gap: 16px; }
.fld { display: flex; flex-direction: column; gap: 6px; }
.fld > span { display: flex; justify-content: space-between; font-size: 10.5px; font-weight: 600; letter-spacing: .06em; text-transform: uppercase; color: var(--n600); }
.fld > span b { font: 400 11px var(--mono); letter-spacing: 0; text-transform: none; color: var(--n500); }
.fld input, .fld textarea { width: 100%; background: var(--surface); border: 1px solid var(--n300); border-radius: var(--r-md); padding: 8px 10px; font: 13px/1.6 var(--mono); color: var(--n900); resize: vertical; transition: border-color .12s; }
.fld input:hover, .fld textarea:hover { border-color: var(--n400); }
.fld input:focus, .fld textarea:focus { outline: 0; border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent); }
.kw { display: block; min-height: 72px; background: var(--surface); border: 1px solid var(--divider); border-radius: var(--r-md); padding: 10px 12px; font: 13px/1.7 var(--mono); color: var(--n900); word-break: break-word; }
.kw .w1 { color: var(--a800); }
.kw .c { color: var(--n500); }
.meter { height: 4px; border-radius: 2px; background: var(--n200); overflow: hidden; }
.meter i { display: block; height: 100%; background: var(--accent); transition: width .2s var(--ease), background .2s; }
.meter.full i { background: var(--moderate); }
.p-stats { display: grid; gap: 1px; background: var(--divider); border: 1px solid var(--divider); border-radius: var(--r-md); overflow: hidden; }
.p-stats div { display: grid; grid-template-columns: 150px 1fr; gap: 12px; background: var(--bg); padding: 8px 12px; font-size: 13px; }
.p-stats dt { color: var(--n600); }
.p-stats dd { font: 12px/1.6 var(--mono); color: var(--n800); }
.p-stats s { color: var(--n500); }
.p-state { font: 12px var(--mono); }
@media (max-width: 760px) { .pack-grid { grid-template-columns: minmax(0, 1fr); } .pack-in { border-right: 0; border-bottom: 1px solid var(--divider); } .p-stats div { grid-template-columns: 1fr; gap: 0; } }

/* install */
.steps { list-style: none; display: grid; grid-template-columns: minmax(0, 1fr); gap: 10px; }
.step p { font-size: 14px; color: var(--n700); margin-bottom: 8px; display: flex; align-items: center; gap: 10px; }
.step p b { width: 20px; height: 20px; display: grid; place-items: center; font: 500 11px var(--mono); border: 1px solid var(--a400); color: var(--a800); border-radius: 50%; }
.line { display: flex; align-items: center; gap: 10px; min-height: 44px; padding: 8px 8px 8px 14px; background: var(--surface); border: 1px solid var(--divider); border-radius: var(--r-lg); font: 13px var(--mono); color: var(--n900); }
.line .p { color: var(--accent); }
.line code { flex: 1; min-width: 0; font: inherit; overflow-x: auto; white-space: nowrap; scrollbar-width: none; }
.line.link { color: var(--n900); transition: border-color .12s; }
.line.link:hover { border-color: var(--a500); }
.line.link .dim { margin-left: auto; font-size: 12px; }
.line button { display: flex; align-items: center; gap: 6px; height: 28px; padding: 0 10px; border: 1px solid var(--n300); border-radius: var(--r-md); font: 12px var(--sans); color: var(--n800); transition: all .12s; flex: none; }
.line button:hover { border-color: var(--n400); background: var(--n100); }
.line button.done { border-color: rgba(79, 201, 138, .5); color: var(--easy); }
.say { color: var(--n800); }

.plans-head { display: flex; align-items: center; justify-content: space-between; margin: 64px 0 16px; gap: 16px; }
.plans-head h3 { font-size: 20px; font-weight: 600; color: var(--n900); }
.seg { display: inline-flex; padding: 2px; border: 1px solid var(--n300); border-radius: var(--r-lg); background: var(--surface); }
.seg button { height: 28px; padding: 0 12px; border-radius: var(--r-md); font-size: 13px; color: var(--n600); }
.seg button:hover { color: var(--n900); }
.seg button.on { background: var(--n200); color: var(--n900); }
.seg em { font-style: normal; font: 11px var(--mono); color: var(--easy); margin-left: 4px; }
.plans { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
.plan { position: relative; display: flex; flex-direction: column; padding: 22px; border: 1px solid var(--divider); border-radius: var(--r-win); background: var(--bg); }
.plan.featured { border-color: var(--a400); box-shadow: 0 0 0 1px var(--a300), 0 20px 60px -20px rgba(95, 160, 245, .25); }
.badge { position: absolute; top: -10px; left: 20px; font: 500 11px var(--mono); color: var(--a900); background: var(--a200); border: 1px solid var(--a400); padding: 1px 8px; border-radius: 99px; }
.plan h4 { font-size: 15px; font-weight: 600; color: var(--n800); }
.price { margin: 8px 0 16px; color: var(--n600); }
.price b { font: 500 36px var(--mono); color: var(--n900); letter-spacing: -.03em; }
.plan ul { list-style: none; margin-bottom: 22px; flex: 1; }
.plan li { font-size: 14px; color: var(--n700); padding: 5px 0 5px 22px; position: relative; }
.plan li::before { content: ""; position: absolute; left: 2px; top: 13px; width: 9px; height: 5px; border-left: 1.5px solid var(--easy); border-bottom: 1.5px solid var(--easy); transform: rotate(-45deg); }
.fine { font-size: 12.5px; color: var(--n500); margin-top: 12px; text-align: center; }
@media (max-width: 820px) { .plans { grid-template-columns: minmax(0, 1fr); } }

.faq { margin-top: 64px; border-top: 1px solid var(--divider); }
.faq details { border-bottom: 1px solid var(--divider); }
.faq summary { list-style: none; cursor: pointer; padding: 16px 0; font-size: 15px; color: var(--n900); display: flex; justify-content: space-between; gap: 16px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font: 16px var(--mono); color: var(--n500); transition: transform .14s; }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq summary:hover { color: var(--a900); }
.faq p { padding: 0 0 18px; color: var(--n700); max-width: 680px; }

.foot { margin-top: 112px; border-top: 1px solid var(--divider); background: var(--chrome); }
.foot-in { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; padding-top: 22px; padding-bottom: 28px; font-size: 12.5px; color: var(--n500); }
.foot-in span { display: flex; align-items: center; gap: 8px; }
.foot-in img { border-radius: 4px; }