/* The Practical Lab — site styles
   Layout concept: a lab notebook. Cool paper, blue-black ink, graph-grid pages,
   a red margin line, highlighter reserved for answers, red pencil for notes and failed tries. */

@font-face {
  font-family: "Archivo";
  src: url("../fonts/archivo.woff2") format("woff2");
  font-weight: 100 900;
  font-stretch: 62% 125%;
  font-display: swap;
}
@font-face {
  font-family: "Caveat";
  src: url("../fonts/caveat.woff2") format("woff2");
  font-weight: 400 700;
  font-display: swap;
}

:root {
  /* color */
  --paper: #F2F4EF;      /* page */
  --surface: #FFFFFF;    /* notebook page */
  --ink: #1D2A57;        /* blue-black ink: text, rules, logo */
  --ink-soft: #4B5679;   /* secondary text */
  --grid: #DCE4EE;       /* graph paper lines */
  --line: #C6CFDC;       /* dividers */
  --hl: #F6DE45;         /* highlighter: answers only */
  --hl-ink: #1D2A57;     /* text on highlighter */
  --pencil: #C23F2E;     /* red pencil: notes, margin line, failed tries */
  --pass: #2B774A;       /* worked */
  --focus: #2F6FED;

  /* type */
  --font-body: "Archivo", "Helvetica Neue", Arial, system-ui, sans-serif;
  --font-note: "Caveat", "Segoe Print", "Bradley Hand", cursive;
  --step--1: 0.875rem;
  --step-0: 1.0625rem;
  --step-1: 1.25rem;
  --step-2: 1.6rem;
  --step-3: clamp(1.9rem, 1.4rem + 2vw, 2.6rem);
  --step-4: clamp(2.5rem, 1.6rem + 4.4vw, 5rem);

  --radius: 6px;
  --gutter: max(20px, env(safe-area-inset-left, 0px));
  --gutter-r: max(20px, env(safe-area-inset-right, 0px));
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #0F1630; --surface: #172040; --ink: #E7EBF5; --ink-soft: #A8B1CC;
    --grid: #222D52; --line: #2F3B66; --hl: #F2D93A; --hl-ink: #0F1630;
    --pencil: #FF8170; --pass: #72D49C; --focus: #8AB0FF; color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #0F1630; --surface: #172040; --ink: #E7EBF5; --ink-soft: #A8B1CC;
  --grid: #222D52; --line: #2F3B66; --hl: #F2D93A; --hl-ink: #0F1630;
  --pencil: #FF8170; --pass: #72D49C; --focus: #8AB0FF; color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } *, *::before, *::after { transition: none !important; animation: none !important; } }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.6;
  font-variation-settings: "wdth" 100;
  text-rendering: optimizeLegibility;
}
img, svg { max-width: 100%; }
a { color: inherit; text-decoration-thickness: 1.5px; text-underline-offset: 3px; }
a:hover { text-decoration-color: var(--pencil); }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; border-radius: 3px; }
h1, h2, h3 { line-height: 1.08; text-wrap: balance; margin: 0; font-stretch: 118%; font-weight: 800; letter-spacing: -0.015em; }
h1 { font-size: var(--step-4); font-stretch: 125%; font-weight: 850; letter-spacing: -0.03em; }
h2 { font-size: var(--step-3); }
h3 { font-size: var(--step-1); font-stretch: 108%; font-weight: 750; letter-spacing: -0.005em; }
p { margin: 0; text-wrap: pretty; }
.measure { max-width: 62ch; }
.lede { font-size: var(--step-1); color: var(--ink-soft); max-width: 46ch; }
.muted { color: var(--ink-soft); }
.small { font-size: var(--step--1); }
.note { font-family: var(--font-note); font-weight: 600; color: var(--pencil); font-size: 1.35rem; line-height: 1.15; }
.hl { background: linear-gradient(transparent 12%, var(--hl) 12%, var(--hl) 88%, transparent 88%); color: var(--hl-ink); padding: 0 .2em; box-decoration-break: clone; -webkit-box-decoration-break: clone; }
.tried { text-decoration: line-through; text-decoration-color: var(--pencil); text-decoration-thickness: 2px; color: var(--ink-soft); }
.visually-hidden { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

.skip { position: absolute; left: 12px; top: -60px; background: var(--ink); color: var(--paper); padding: 10px 14px; border-radius: var(--radius); z-index: 50; }
.skip:focus { top: calc(12px + env(safe-area-inset-top, 0px)); }

.wrap { max-width: 1240px; margin-inline: auto; padding-left: var(--gutter); padding-right: var(--gutter-r); }
.section { padding-block: clamp(56px, 8vw, 104px); }
.section + .section { border-top: 1px solid var(--line); }
.section-head { display: grid; gap: 12px; margin-bottom: clamp(28px, 4vw, 44px); }

/* header */
.site-header { position: sticky; top: env(safe-area-inset-top, 0px); z-index: 20; background: color-mix(in srgb, var(--paper) 92%, transparent); backdrop-filter: saturate(140%) blur(8px); -webkit-backdrop-filter: saturate(140%) blur(8px); border-bottom: 1px solid var(--line); }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 64px; }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 800; font-stretch: 118%; letter-spacing: -0.01em; font-size: 1.08rem; white-space: nowrap; }
.brand svg { width: 30px; height: 30px; flex: none; }
.nav { display: flex; align-items: center; gap: 6px; }
.nav { gap: 8px; }
.btn-nav { padding: 8px 15px; font-weight: 650; background: transparent; color: var(--ink); }
.btn-nav:hover { background: var(--surface); }
.btn-nav[aria-current="page"] { background: var(--surface); box-shadow: inset 0 -3px 0 var(--ink); }
.menu-btn { display: none; }
@media (max-width: 720px) {
  .menu-btn { display: inline-flex; align-items: center; gap: 8px; background: none; border: 1.5px solid var(--ink); color: var(--ink); font: inherit; font-weight: 650; padding: 7px 12px; border-radius: var(--radius); cursor: pointer; }
  .js .nav { display: none; position: absolute; left: 0; right: 0; top: 100%; flex-direction: column; align-items: stretch; gap: 0; background: var(--paper); border-bottom: 1px solid var(--line); padding: 8px var(--gutter-r) 16px var(--gutter); }
  .js .nav.open { display: flex; }
  .js .nav { gap: 10px; }
  .js .nav .btn { justify-content: center; padding: 13px 16px; }
  .nav { flex-wrap: wrap; }
}

/* buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; font: inherit; font-weight: 700; font-stretch: 108%; text-decoration: none; padding: 12px 20px; border-radius: var(--radius); border: 1.5px solid var(--ink); cursor: pointer; line-height: 1.2; }
.btn-primary { background: var(--ink); color: var(--paper); }
.btn-primary:hover { background: color-mix(in srgb, var(--ink) 86%, var(--pencil)); }
.btn-ghost { background: transparent; color: var(--ink); }
.btn-ghost:hover { background: var(--surface); }
.nav .btn { padding: 9px 16px; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; }

/* hero */
.hero { padding-block: clamp(40px, 6vw, 88px) clamp(48px, 7vw, 96px); }
.hero .wrap { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr); gap: clamp(32px, 5vw, 72px); align-items: center; }
.hero-copy { display: grid; gap: 24px; min-width: 0; }
.hero-copy .lede { color: var(--ink); opacity: .86; }
@media (max-width: 920px) { .hero .wrap { grid-template-columns: minmax(0, 1fr); } }

/* notebook page */
.page {
  position: relative;
  background-color: var(--surface);
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 22px 22px;
  background-position: -1px -1px;
  border: 1.5px solid var(--ink);
  border-radius: var(--radius);
  padding: 26px 24px 24px 64px;
  box-shadow: 0 1px 0 var(--line), 0 18px 40px -24px color-mix(in srgb, var(--ink) 45%, transparent);
  min-width: 0;
}
.page::before { content: ""; position: absolute; left: 42px; top: 0; bottom: 0; width: 2px; background: var(--pencil); opacity: .7; }
.page-tag { display: flex; justify-content: space-between; gap: 12px; align-items: baseline; font-size: var(--step--1); color: var(--ink-soft); font-variant-numeric: tabular-nums; margin-bottom: 10px; }
.page-q { font-size: var(--step-2); font-stretch: 112%; font-weight: 780; line-height: 1.15; letter-spacing: -0.01em; text-wrap: balance; margin-bottom: 20px; }
@media (max-width: 520px) { .page { padding: 22px 16px 20px 40px; } .page::before { left: 24px; } .page-q { font-size: 1.35rem; } }

/* calculator */
.calc { display: grid; gap: 16px; }
.field { display: grid; gap: 6px; min-width: 0; }
.field-row { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr); gap: 14px; }
@media (max-width: 460px) { .field-row { grid-template-columns: minmax(0, 1fr); } }
label, .label { font-weight: 650; font-size: var(--step--1); }
input[type="time"], input[type="text"], input[type="email"], input[type="search"], select, textarea {
  font: inherit; color: var(--ink); background: var(--surface); width: 100%;
  border: 1.5px solid var(--ink); border-radius: var(--radius); padding: 10px 12px; min-height: 46px;
}
textarea { min-height: 150px; resize: vertical; line-height: 1.5; }
select { appearance: none; -webkit-appearance: none; padding-right: 36px; background-image: linear-gradient(45deg, transparent 50%, currentColor 50%), linear-gradient(135deg, currentColor 50%, transparent 50%); background-position: calc(100% - 18px) 52%, calc(100% - 12px) 52%; background-size: 6px 6px; background-repeat: no-repeat; }
.seg { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border: 1.5px solid var(--ink); border-radius: var(--radius); overflow: hidden; background: var(--surface); }
.seg input { position: absolute; opacity: 0; pointer-events: none; }
.seg label { text-align: center; padding: 10px 6px; cursor: pointer; font-weight: 600; line-height: 1.2; border-left: 1.5px solid var(--ink); }
.seg label:first-of-type { border-left: 0; }
.seg input:checked + label { background: var(--ink); color: var(--surface); }
.seg input:focus-visible + label { outline: 3px solid var(--focus); outline-offset: -4px; }
.result { border-top: 1.5px dashed var(--ink); padding-top: 16px; display: grid; gap: 6px; }
.result-time { font-size: clamp(2rem, 1.4rem + 2.6vw, 2.9rem); font-weight: 850; font-stretch: 120%; letter-spacing: -0.02em; line-height: 1.05; font-variant-numeric: tabular-nums; }
.result-sub { color: var(--ink-soft); font-size: var(--step--1); }
.margin-note { position: absolute; right: -8px; top: -30px; transform: rotate(-3deg); background: transparent; }
@media (max-width: 920px) { .margin-note { position: static; transform: none; margin-top: 12px; } }

/* shelves */
.shelves { display: grid; }
.shelf { display: grid; grid-template-columns: minmax(0, 0.8fr) minmax(0, 2fr); gap: 16px 40px; padding-block: 26px; border-top: 1.5px solid var(--ink); }
.shelf:last-child { border-bottom: 1.5px solid var(--ink); }
.shelf-name h3 { font-size: var(--step-2); font-stretch: 122%; font-weight: 820; letter-spacing: -0.02em; }
.shelf-name p { color: var(--ink-soft); margin-top: 6px; font-size: var(--step--1); max-width: 30ch; }
.entries { list-style: none; margin: 0; padding: 0; display: grid; min-width: 0; }
.entry { border-bottom: 1px solid var(--line); }
.entry:last-child { border-bottom: 0; }
.entry a { display: grid; grid-template-columns: 4.5rem minmax(0, 1fr) auto; gap: 4px 18px; align-items: baseline; padding: 12px 0; text-decoration: none; }
.entry a:hover .entry-name { text-decoration: underline; text-decoration-color: var(--pencil); text-underline-offset: 4px; }
.entry-no { color: var(--ink-soft); font-size: var(--step--1); font-variant-numeric: tabular-nums; }
.entry-name { font-weight: 750; font-stretch: 110%; font-size: var(--step-1); }
.entry-q { grid-column: 2 / 3; color: var(--ink-soft); }
.entry .status { grid-column: 3; grid-row: 1; }
.empty { color: var(--ink-soft); padding: 12px 0; }
.empty a { font-weight: 650; color: var(--ink); }
@media (max-width: 760px) {
  .shelf { grid-template-columns: minmax(0, 1fr); }
  .entry a { grid-template-columns: minmax(0, 1fr) auto; }
  .entry-no { grid-column: 1 / -1; }
  .entry-name { grid-column: 1; }
  .entry .status { grid-column: 2; grid-row: 2; }
  .entry-q { grid-column: 1 / -1; }
}

.status { display: inline-flex; align-items: center; gap: 7px; font-size: var(--step--1); font-weight: 650; white-space: nowrap; }
.status::before { content: ""; width: 9px; height: 9px; border-radius: 50%; border: 2px solid currentColor; }
.status-testing { color: var(--pass); }
.status-testing::before { background: currentColor; }
.status-lab { color: var(--ink); }
.status-lab::before { background: linear-gradient(90deg, currentColor 50%, transparent 50%); }
.status-logged { color: var(--ink-soft); }
.status-ready { color: var(--pass); }
.status-ready::before { background: currentColor; border-radius: 2px; }

/* experiment loop */
.loop { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0; counter-reset: step; border-top: 1.5px solid var(--ink); }
.loop li { counter-increment: step; padding: 22px 22px 26px 0; border-bottom: 1px solid var(--line); display: grid; gap: 8px; align-content: start; min-width: 0; }
.loop li::before { content: counter(step); font-weight: 850; font-stretch: 125%; font-size: 2rem; line-height: 1; color: var(--ink); font-variant-numeric: tabular-nums; }
.loop h3 { font-size: var(--step-1); }
.loop p { color: var(--ink-soft); font-size: var(--step--1); }
@media (max-width: 860px) { .loop { grid-template-columns: repeat(2, minmax(0, 1fr)); } .loop li { padding-right: 16px; } }
.loop-note { margin-top: 18px; display: flex; flex-wrap: wrap; align-items: baseline; gap: 6px 14px; }

/* request / message mock */
.split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: clamp(32px, 5vw, 72px); align-items: center; }
@media (max-width: 860px) { .split { grid-template-columns: minmax(0, 1fr); } }
.thread { display: grid; gap: 12px; max-width: 460px; }
.bubble { background: var(--surface); border: 1.5px solid var(--ink); border-radius: 18px 18px 18px 4px; padding: 14px 16px; }
.bubble.reply { justify-self: end; border-radius: 18px 18px 4px 18px; background: var(--ink); color: var(--paper); }
.bubble .who { font-size: var(--step--1); font-weight: 700; margin-bottom: 4px; display: block; }
.bubble.reply .who { color: var(--paper); opacity: .75; }
.thread-cap { color: var(--ink-soft); font-size: var(--step--1); }
.channels { list-style: none; padding: 0; margin: 20px 0 0; display: grid; gap: 10px; }
.channels li { display: grid; grid-template-columns: 7.5rem minmax(0, 1fr); gap: 12px; padding-bottom: 10px; border-bottom: 1px solid var(--line); }
.channels strong { font-weight: 700; }
@media (max-width: 420px) { .channels li { grid-template-columns: minmax(0, 1fr); gap: 2px; } }

/* outputs */
.outputs { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0; border-top: 1.5px solid var(--ink); }
.outputs > div { padding: 22px 22px 22px 0; display: grid; gap: 8px; align-content: start; border-bottom: 1px solid var(--line); min-width: 0; }
.outputs p { color: var(--ink-soft); font-size: var(--step--1); }
@media (max-width: 860px) { .outputs { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 480px) { .outputs { grid-template-columns: minmax(0, 1fr); } }

/* trust band */
.band { background: var(--ink); color: var(--paper); }
.band .wrap { padding-block: clamp(56px, 8vw, 96px); display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); gap: 40px; align-items: end; }
.band h2 { color: var(--paper); }
.band p { color: color-mix(in srgb, var(--paper) 82%, var(--ink)); }
.band .note { color: var(--hl); }
@media (max-width: 860px) { .band .wrap { grid-template-columns: minmax(0, 1fr); } }

/* signup */
.signup { display: grid; gap: 12px; max-width: 520px; }
.inline-form { display: flex; gap: 10px; flex-wrap: wrap; }
.inline-form input { flex: 1 1 220px; min-width: 0; }
.form-msg { font-size: var(--step--1); min-height: 1.4em; }
.form-msg.ok { color: var(--pass); font-weight: 650; }
.form-msg.err { color: var(--pencil); font-weight: 650; }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }

/* forms */
.form { display: grid; gap: 18px; }
.check { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 10px; align-items: start; font-weight: 500; font-size: var(--step-0); }
.check input { width: 20px; height: 20px; margin-top: 3px; accent-color: var(--ink); }
.hint { color: var(--ink-soft); font-size: var(--step--1); font-weight: 400; }

/* tools page */
.filters { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 18px; }
.chip { font: inherit; font-size: var(--step--1); font-weight: 650; padding: 8px 14px; border-radius: 999px; border: 1.5px solid var(--ink); background: transparent; color: var(--ink); cursor: pointer; }
.chip[aria-pressed="true"] { background: var(--ink); color: var(--paper); }
.toolbar { display: grid; grid-template-columns: minmax(0, 1fr); gap: 14px; margin-bottom: 8px; max-width: 520px; }
.no-results { padding: 24px 0; color: var(--ink-soft); }

/* tool page */
.crumbs { font-size: var(--step--1); color: var(--ink-soft); margin-bottom: 18px; }
.crumbs ol { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 6px; }
.crumbs li + li::before { content: "/"; margin-right: 6px; color: var(--line); }
.tool-head { display: grid; gap: 18px; }
.tool-meta { display: flex; flex-wrap: wrap; gap: 10px 22px; align-items: center; color: var(--ink-soft); font-size: var(--step--1); font-variant-numeric: tabular-nums; }
.tool-grid { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, .75fr); gap: clamp(28px, 4vw, 56px); align-items: start; }
@media (max-width: 900px) { .tool-grid { grid-template-columns: minmax(0, 1fr); } }
.aside { display: grid; gap: 28px; }
.aside section { display: grid; gap: 10px; }
.problem { border-left: 3px solid var(--pencil); padding: 4px 0 4px 16px; font-size: var(--step-1); font-weight: 600; }
.log { list-style: none; padding: 0; margin: 0; display: grid; gap: 12px; }
.log li { display: grid; grid-template-columns: 5.5rem minmax(0, 1fr); gap: 12px; font-size: var(--step--1); }
.log time { color: var(--ink-soft); font-variant-numeric: tabular-nums; }
.placeholder { border: 1.5px dashed var(--ink-soft); border-radius: var(--radius); padding: 22px; display: grid; gap: 10px; color: var(--ink-soft); }
.placeholder strong { color: var(--ink); }
.prose { display: grid; gap: 16px; max-width: 66ch; }
.prose h2 { margin-top: 18px; font-size: var(--step-2); }
.prose ul { margin: 0; padding-left: 1.2em; display: grid; gap: 6px; }

/* footer */
.site-footer { border-top: 1.5px solid var(--ink); padding-block: 56px 40px; background: var(--surface); }
.site-footer input[type="email"] { background: var(--paper); }
.foot-base { border-top: 1px solid var(--line); padding-top: 20px; }
.foot { display: grid; grid-template-columns: minmax(0, 1.4fr) repeat(2, minmax(0, .6fr)); gap: 36px; }
.foot h2 { font-size: var(--step-1); font-stretch: 112%; }
.foot ul { list-style: none; padding: 0; margin: 10px 0 0; display: grid; gap: 8px; }
.foot ul a { text-decoration: none; }
.foot ul a:hover { text-decoration: underline; }
.foot-base { margin-top: 44px; display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; color: var(--ink-soft); font-size: var(--step--1); }
@media (max-width: 760px) { .foot { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); } .foot > :first-child { grid-column: 1 / -1; } }

.center-page { min-height: 60vh; display: grid; align-content: center; gap: 22px; }

/* home hero without demo */
.hero-solo .wrap { display: grid; gap: 28px; grid-template-columns: minmax(0, 1fr); }
.hero-solo h1 { font-size: clamp(3rem, 1.6rem + 6.4vw, 7.4rem); max-width: 11ch; }
.hero-row { display: grid; grid-template-columns: minmax(0, 1.2fr) auto; gap: 24px 48px; align-items: end; border-top: 1.5px solid var(--ink); padding-top: 24px; }
.hero-row .lede { color: var(--ink); opacity: .86; }
@media (max-width: 820px) { .hero-row { grid-template-columns: minmax(0, 1fr); } }

/* tools: view switch and A to Z list */
.views { display: inline-grid; grid-template-columns: repeat(2, auto); border: 1.5px solid var(--ink); border-radius: var(--radius); overflow: hidden; margin: 6px 0 22px; max-width: 100%; }
.view-btn { font: inherit; font-weight: 650; padding: 10px 18px; background: var(--surface); color: var(--ink); border: 0; cursor: pointer; }
.view-btn + .view-btn { border-left: 1.5px solid var(--ink); }
.view-btn[aria-pressed="true"] { background: var(--ink); color: var(--paper); }
.az-title { font-size: var(--step-2); margin-bottom: 12px; }
.js [data-panel="az"] .az-title { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
[data-panel="shelves"] { margin-top: 40px; }
.js [data-panel="shelves"] { margin-top: 0; }
.az { border-top: 1.5px solid var(--ink); border-bottom: 1.5px solid var(--ink); }
.az .entry a { grid-template-columns: minmax(9rem, .7fr) minmax(0, 1.6fr) minmax(0, .6fr) 9rem; align-items: center; padding: 14px 0; }
.az .entry-q { grid-column: auto; color: var(--ink-soft); }
.az .entry .status { grid-column: auto; grid-row: auto; justify-self: end; }
.entry-shelf { color: var(--ink-soft); font-size: var(--step--1); }
@media (max-width: 760px) {
  .az .entry a { grid-template-columns: minmax(0, 1fr) auto; }
  .az .entry-name { grid-column: 1; grid-row: 1; }
  .az .entry .status { grid-column: 2; grid-row: 1; }
  .az .entry-q { grid-column: 1 / -1; }
  .az .entry-shelf { grid-column: 1 / -1; }
}
[id] { scroll-margin-top: 90px; }
.more-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 14px; }
.more-list a { font-weight: 650; }

/* home hero band */
.hero-solo { background-color: var(--surface); background-image: linear-gradient(var(--grid) 1px, transparent 1px), linear-gradient(90deg, var(--grid) 1px, transparent 1px); background-size: 28px 28px; border-bottom: 1.5px solid var(--ink); }
.hero-solo .wrap { gap: 32px; }
.hero-title { display: grid; gap: 14px; }
.hero-solo h1 { font-size: clamp(2.9rem, 1.4rem + 6.6vw, 7.6rem); max-width: none; line-height: .95; }
.tagline { font-size: clamp(1.25rem, 1rem + 1vw, 1.7rem); font-weight: 450; font-stretch: 100%; color: var(--ink-soft); letter-spacing: 0; }
.hero-row { border-top-color: var(--line); }

/* featured tools */
.featured-head { grid-template-columns: minmax(0, 1fr) auto; align-items: end; }
@media (max-width: 560px) { .featured-head { grid-template-columns: minmax(0, 1fr); } .featured-head .btn { justify-self: start; } }
.featured { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 22px; }
@media (max-width: 900px) { .featured { grid-template-columns: minmax(0, 1fr); } }
.feat { display: grid; gap: 10px; align-content: start; position: relative; padding-bottom: 22px; }
.feat h3 { font-size: var(--step-2); font-stretch: 118%; font-weight: 820; letter-spacing: -0.015em; }
.feat h3 a { text-decoration: none; }
.feat h3 a::after { content: ""; position: absolute; inset: 0; border-radius: var(--radius); }
.feat h3 a:focus-visible { outline: none; }
.feat h3 a:focus-visible::after { outline: 3px solid var(--focus); outline-offset: 3px; }
.feat-q { font-size: var(--step-1); line-height: 1.35; }
.feat-shelf { color: var(--ink-soft); font-size: var(--step--1); }
.feat-cta { font-weight: 700; text-decoration: underline; text-decoration-thickness: 1.5px; text-underline-offset: 4px; margin-top: 6px; }
.feat:hover .feat-cta { text-decoration-color: var(--pencil); }
.feat:hover { box-shadow: 0 1px 0 var(--line), 0 22px 44px -24px color-mix(in srgb, var(--ink) 60%, transparent); }

/* problem request section: title, sample messages, then contact on mobile */
.ask-split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); grid-template-areas: "thread head" "thread contact"; column-gap: clamp(32px, 5vw, 72px); row-gap: 24px; align-items: start; }
.ask-head { grid-area: head; display: grid; gap: 18px; align-self: end; }
.ask-split .thread { grid-area: thread; align-self: center; }
.ask-contact { grid-area: contact; display: grid; gap: 18px; }
.ask-contact .channels { margin-top: 2px; }
@media (max-width: 860px) {
  .ask-split { grid-template-columns: minmax(0, 1fr); grid-template-areas: "head" "thread" "contact"; row-gap: 28px; }
}

/* tiny looping animations (all stop under reduced motion) */
.tagline { display: flex; align-items: center; gap: 12px; }
.bubbling { width: 1.5em; height: 1.875em; flex: none; color: var(--ink); overflow: visible; }
.bubbling .bubbles circle { fill: var(--ink); opacity: 0; animation: rise 2.4s ease-in infinite; transform-box: fill-box; }
.bubbling .bubbles circle:nth-child(2) { animation-delay: .8s; }
.bubbling .bubbles circle:nth-child(3) { animation-delay: 1.6s; }
@keyframes rise { 0% { opacity: 0; transform: translateY(4px); } 20% { opacity: .9; } 100% { opacity: 0; transform: translateY(-24px); } }

.with-icon { display: flex; align-items: center; gap: .4em; flex-wrap: wrap; }
.cycle { width: .8em; height: .8em; flex: none; color: var(--pencil); animation: turn 6s linear infinite; }
@keyframes turn { to { transform: rotate(360deg); } }

.bubble.typing { display: inline-flex; gap: 5px; width: max-content; padding: 14px 16px; }
.bubble.typing i { width: 7px; height: 7px; border-radius: 50%; background: var(--ink-soft); animation: dot 1.2s ease-in-out infinite; }
.bubble.typing i:nth-child(2) { animation-delay: .15s; }
.bubble.typing i:nth-child(3) { animation-delay: .3s; }
@keyframes dot { 0%, 60%, 100% { transform: translateY(0); opacity: .45; } 30% { transform: translateY(-4px); opacity: 1; } }

/* tool icons */
.entry-name { display: inline-flex; align-items: center; gap: .55em; }
.ticon { width: 1.75em; height: 1.75em; flex: none; color: var(--ink); overflow: visible; }
.ticon * { transform-box: fill-box; }
.ti-steam { animation: tisteam 2.4s ease-in-out infinite; opacity: 0; }
.ti-steam.s2 { animation-delay: .8s; } .ti-steam.s3 { animation-delay: 1.6s; }
@keyframes tisteam { 0% { opacity: 0; transform: translateY(3px); } 40% { opacity: 1; } 100% { opacity: 0; transform: translateY(-4px); } }
.ti-sway { transform-origin: 50% 100%; animation: tisway 2.8s ease-in-out infinite; }
@keyframes tisway { 0%, 100% { transform: rotate(-5deg); } 50% { transform: rotate(5deg); } }
.ti-pull { transform-origin: 50% 0%; animation: tipull 1.4s ease-in-out infinite; }
@keyframes tipull { 0%, 100% { transform: rotate(-25deg); } 50% { transform: rotate(25deg); } }
.ti-beam { transform-origin: 50% 0%; animation: tibeam 3.2s ease-in-out infinite; }
@keyframes tibeam { 0%, 100% { transform: rotate(-9deg); } 50% { transform: rotate(9deg); } }
.ti-roll { animation: tiroll 2.2s ease-in-out infinite; }
@keyframes tiroll { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(9px); } }
.ti-stripe { transform-origin: 50% 0%; animation: tistripe 2.2s ease-in-out infinite; }
@keyframes tistripe { 0%, 100% { transform: scaleY(.35); } 50% { transform: scaleY(.75); } }
.ti-hand { transform-origin: 0% 50%; animation: tihand 3s linear infinite; }
@keyframes tihand { to { transform: rotate(360deg); } }
.ti-drop { animation: tidrop 1.8s ease-in infinite; }
@keyframes tidrop { 0% { transform: translateY(-3px) scale(.4); opacity: 0; } 30% { opacity: 1; transform: translateY(0) scale(1); } 100% { transform: translateY(6px); opacity: 0; } }
.ti-flask .bubbles circle { fill: currentColor; opacity: 0; animation: rise 2.4s ease-in infinite; }
.ti-flask .bubbles circle:nth-child(2) { animation-delay: 1.2s; }
.entry a { align-items: center; }
.ti-roll { animation-name: tiroll2; }
@keyframes tiroll2 { 0%, 100% { transform: translateY(-1px); } 50% { transform: translateY(4px); } }

/* tools page: each tool as a thin outlined row */
.az { border-top: 0; border-bottom: 0; display: grid; gap: 10px; }
.shelf .entries { gap: 10px; }
.entry, .entry:last-child { border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.az .entry a, .entry a { padding: 16px 20px; }
.entry:hover { border-color: var(--ink); }
.entry a:focus-visible { outline-offset: 2px; }
.shelf .empty { border: 1px dashed var(--line); border-radius: var(--radius); padding: 16px 20px; }
@media (max-width: 760px) { .az .entry a, .entry a { padding: 14px 16px; } }