/* fieldia.dev's front page: a story told top to bottom. A navy stage opens it, where a page of JSON
   is written and drawn; chapters follow on the light page, each copy beside a live form; a dark
   finale closes it. The ruled lines are a form sheet's underlines, the product's own material.
   The paper and its cards follow the reader's scheme; the navy stage and finale are the same in both. */
:root {
  --h-ink: #10192b;
  --h-muted: #4f5b70;
  --h-paper: #f4f6fa;
  --h-surface: #ffffff;
  --h-line: #dfe4ec;
  /* The brand as words and edges on the paper. */
  --h-navy: #002855;
  /* A part filled with the brand, a picked theme or tab, and its words. */
  --h-fill: #002855;
  --h-on-fill: #ffffff;
  /* Code inline in the copy, and the frameworks' tabs' well. */
  --h-code: #e9eef6;
  --h-tabs: #e8edf5;
  /* The story's window (story.css): its title bar and dots, the chatter's side, a message of mine, a chip, the row picked, a warning. */
  --h-chrome: #eef1f6;
  --h-chrome-dot: #cfd6e1;
  --h-side: #f6f8fb;
  --h-mine: #fff4dc;
  --h-chip: #e7eefb;
  --h-picked: #eaf2ff;
  --h-warn: #a14f00;
  --h-stage: #071a35;
  --h-stage-2: #0b2447;
  --h-stage-ink: #e8eef8;
  --h-stage-muted: #a4b3cc;
  --h-rule: rgba(164, 179, 204, 0.12);
  --h-signal: #4f9dff;
  --h-signal-ink: #04122a;
  --h-signal-hover: #77b4ff;
  --h-ok: #2f9e66;
  /* The story's "saved" toast, white on green in either scheme. */
  --h-saved: #1f7a4d;
  --h-on-saved: #ffffff;
  --h-caret: #ffc75f;
  --j-key: #8cc4ff;
  --j-str: #ffd28a;
  --j-lit: #9be3b8;
  --j-punct: #7f8ca6;
  --h-display: "Bricolage Grotesque", "Avenir Next", "Segoe UI", system-ui, sans-serif;
  --h-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --h-gutter: max(16px, calc((100% - 1200px) / 2));
}
/* A dark system: the paper and its cards go dark, the brand's words go light; each pair still 4.5:1 or more. */
@media (prefers-color-scheme: dark) {
  :root {
    --h-ink: #e8eef8;
    --h-muted: #a4b3cc;
    --h-paper: #0e1420;
    --h-surface: #151d2b;
    --h-line: #2a3547;
    --h-navy: #8cc4ff;
    --h-fill: #8cc4ff;
    --h-on-fill: #04122a;
    --h-code: #1c2a40;
    --h-tabs: #070d17;
    --h-chrome: #1a2433;
    --h-chrome-dot: #3a4a63;
    --h-side: #111a28;
    --h-mine: #33290f;
    --h-chip: #1d3354;
    --h-picked: #1a2f4f;
    --h-warn: #f2b55c;
  }
}

.story { background: var(--h-paper); color: var(--h-ink); overflow-x: clip; }
/* Only the story's own headings: the forms inside it keep their own. */
.opening-copy h1, .chapter-copy h2, .finale > h2 { font-family: var(--h-display); letter-spacing: -0.02em; text-wrap: balance; margin: 0; }
.story code { font-family: var(--h-mono); }

/* ---- buttons ---- */
.btn { display: inline-flex; align-items: center; gap: 10px; min-height: 46px; padding: 0 20px; border-radius: 10px; font: 600 16px/1 var(--font); text-decoration: none; cursor: pointer; border: 1px solid transparent; transition: transform 0.15s ease, background-color 0.15s ease, border-color 0.15s ease; }
.btn:hover { transform: translateY(-1px); }
.btn:focus-visible, .story button:focus-visible, .reel-card:focus-visible, .shot:focus-visible, .tpl-code:focus-visible { outline: 2px solid var(--h-signal); outline-offset: 3px; }
.btn-solid { background: var(--h-signal); color: var(--h-signal-ink); }
.btn-solid:hover { background: var(--h-signal-hover); color: var(--h-signal-ink); }
.btn-copy { background: transparent; color: var(--h-stage-ink); border-color: rgba(164, 179, 204, 0.35); }
.btn-copy code { background: none; padding: 0; font-size: 14.5px; color: var(--h-stage-ink); }
.btn-copy .copy-word { font-size: 13px; color: var(--h-stage-muted); padding-inline-start: 10px; border-inline-start: 1px solid rgba(164, 179, 204, 0.3); }
.btn-copy:hover { border-color: var(--h-signal); }
.btn-ghost { background: transparent; color: var(--h-stage-ink); border-color: rgba(164, 179, 204, 0.35); }
.btn-ghost:hover { border-color: var(--h-signal); color: var(--h-stage-ink); }

/* ---- the opening: copy above, the stage across the width ---- */
.opening {
  position: relative; display: grid; gap: 36px; padding: 52px var(--h-gutter) 88px;
  color: var(--h-stage-ink);
  background:
    repeating-linear-gradient(to bottom, transparent 0 43px, var(--h-rule) 43px 44px),
    radial-gradient(1200px 520px at 78% 0%, rgba(79, 157, 255, 0.18), transparent 70%),
    linear-gradient(var(--h-stage), var(--h-stage-2));
}
.opening-copy { display: grid; gap: 20px; max-width: 1100px; }
.kicker { margin: 0; font: 600 13px/1 var(--h-mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--h-caret); }
.opening-copy h1 { font-size: clamp(38px, 5.2vw, 70px); line-height: 1; font-weight: 800; }
.opening-copy h1 span { color: var(--h-signal); }
.lede { margin: 0; max-width: 62ch; font-size: clamp(17px, 1.6vw, 20px); line-height: 1.55; color: var(--h-stage-muted); }
.opening-actions { display: flex; flex-wrap: wrap; gap: 12px; }

.stage { background: rgba(4, 14, 30, 0.72); border: 1px solid rgba(164, 179, 204, 0.22); border-radius: 18px; overflow: hidden; box-shadow: 0 30px 80px rgba(0, 0, 0, 0.35); min-width: 0; }
.stage-bar { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 16px; padding: 12px 16px; border-bottom: 1px solid rgba(164, 179, 204, 0.18); font: 13px/1.3 var(--h-mono); color: var(--h-stage-muted); }
.stage-file::before { content: ""; display: inline-block; width: 8px; height: 8px; margin-inline-end: 10px; border-radius: 50%; background: var(--h-ok); box-shadow: 0 0 0 4px rgba(47, 158, 102, 0.2); vertical-align: middle; }
.stage-step { color: var(--h-caret); }
.stage-controls { margin-inline-start: auto; display: flex; gap: 8px; }
.stage-controls button { font: 600 13px/1 var(--font); color: var(--h-stage-ink); background: rgba(164, 179, 204, 0.12); border: 1px solid rgba(164, 179, 204, 0.25); border-radius: 8px; padding: 8px 12px; cursor: pointer; }
.stage-controls button:hover { border-color: var(--h-signal); }
.stage-panes { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); min-height: clamp(420px, 46vw, 560px); }
.stage-json code { background: none; padding: 0; color: inherit; font: inherit; border-radius: 0; }
.stage-json { margin: 0; padding: 18px 20px; overflow: auto; font: 13px/1.6 var(--h-mono); color: var(--j-punct); background: transparent; border-inline-end: 1px solid rgba(164, 179, 204, 0.18); white-space: pre; tab-size: 2; }
.stage-json .k { color: var(--j-key); }
.stage-json .s { color: var(--j-str); }
.stage-json .l { color: var(--j-lit); }
.stage-json .caret { display: inline-block; width: 0.55em; height: 1.15em; margin-inline-start: 1px; vertical-align: text-bottom; background: var(--h-caret); animation: blink 1s steps(1) infinite; }
.stage-json .fresh { background: rgba(255, 199, 95, 0.14); border-radius: 3px; }
@keyframes blink { 50% { opacity: 0; } }
.stage-form { padding: 22px; background: var(--h-surface); color: var(--h-ink); min-width: 0; overflow: auto; }
.stage-form .fd-form { --fd-page: transparent; }
/* The live forms wear the reader's scheme (home.js, live.js); a form that names one adds room round itself, and these cards have their own. */
.story :is(.stage-form, .live-form) .fd-form[data-scheme] > .fd-content { padding: 0; }
.stage-form .fd-field { transition: background-color 0.6s ease; border-radius: 8px; }
.stage-form .fd-field.just-drawn { animation: drawn 0.9s ease both; }
@keyframes drawn { from { background-color: rgba(79, 157, 255, 0.18); transform: translateY(6px); } to { background-color: transparent; transform: none; } }

/* ---- chapters: copy beside a live part; the flip puts the live part first ---- */
.chapter { display: grid; grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr); gap: 48px; align-items: center; padding: 96px var(--h-gutter); border-top: 1px solid var(--h-line); }
.chapter-flip .chapter-copy { order: 2; }
.chapter-center, .chapter-wide { grid-template-columns: minmax(0, 1fr); }
/* The record is the chapter's subject: its copy in two columns above it, the sheet across the width. */
.chapter-stack { grid-template-columns: minmax(0, 1fr); }
.chapter-stack .chapter-copy { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); column-gap: 48px; align-items: start; }
.chapter-stack .chapter-copy > :is(.chapter-no, h2) { grid-column: 1; }
.chapter-stack .chapter-copy > p:not(.chapter-no) { grid-column: 1; }
.chapter-stack .chapter-copy > .ticks { grid-column: 2; grid-row: 2 / span 2; align-self: end; }
.chapter-center .chapter-copy { max-width: 720px; }
.chapter-copy { display: grid; gap: 16px; align-content: start; min-width: 0; }
.chapter-copy > p { margin: 0; max-width: 60ch; color: var(--h-muted); font-size: 17.5px; line-height: 1.65; }
.chapter-no { font: 600 13px/1 var(--h-mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--h-navy) !important; }
.chapter-copy h2 { font-size: clamp(30px, 3.6vw, 46px); line-height: 1.05; font-weight: 700; color: var(--h-ink); }
.ticks { list-style: none; margin: 4px 0 0; padding: 0; display: grid; gap: 10px; color: var(--h-ink); }
.ticks li { position: relative; padding-inline-start: 28px; line-height: 1.5; }
.ticks li::before { content: ""; position: absolute; inset-inline-start: 0; top: 0.25em; width: 16px; height: 16px; border-radius: 50%; background: var(--h-ok) no-repeat center / 10px url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 10 10'%3E%3Cpath d='M1.5 5.2 4 7.5 8.5 2.5' fill='none' stroke='white' stroke-width='1.6'/%3E%3C/svg%3E"); }
.ticks code, .chapter-copy p code { font-size: 0.86em; background: var(--h-code); padding: 0.1em 0.35em; border-radius: 4px; }
.chapter-cta { margin-top: 8px !important; }
.chapter-live { min-width: 0; background: var(--h-surface); border: 1px solid var(--h-line); border-radius: 16px; box-shadow: 0 20px 50px rgba(16, 25, 43, 0.08); }
.hero-live { padding: 18px 20px 14px; }
.sheet-live { padding: 0; overflow: hidden; }
.sheet-host { min-height: 420px; }
.sheet-host .fd-form { --fd-page: var(--h-surface); }
.sheet-again { font: inherit; color: var(--h-navy); background: none; border: 0; padding: 0; text-decoration: underline; text-underline-offset: 2px; cursor: pointer; }
.sheet-caption { margin: 0; padding: 12px 18px; border-top: 1px solid var(--h-line); font: 13px/1.4 var(--h-mono); color: var(--h-muted); }

/* ---- everything in it: a tile for each part every page can use ---- */
.chapter-more { grid-column: 1 / -1; margin: 0; }
.chapter-more a { color: var(--h-navy); font-weight: 650; text-underline-offset: 3px; }
.powers { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 220px), 1fr)); gap: 14px; }
.power { position: relative; display: grid; gap: 6px; align-content: start; height: 100%; padding: 18px 18px 20px; background: var(--h-surface); border: 1px solid var(--h-line); border-radius: 14px; color: var(--h-ink); text-decoration: none; transition: border-color 0.15s ease, transform 0.15s ease; }
.power:hover { border-color: var(--h-navy); transform: translateY(-2px); color: var(--h-ink); }
.power:focus-visible { outline: 2px solid var(--h-signal); outline-offset: 3px; }
.power-figure { padding-inline-end: 22px; font: 600 12px/1.3 var(--h-mono); letter-spacing: 0.04em; text-transform: uppercase; color: var(--h-navy); }
.power b { font: 700 19px/1.2 var(--h-display); }
.power-words { color: var(--h-muted); font-size: 14.5px; line-height: 1.55; }
.power-go { position: absolute; inset-block-start: 16px; inset-inline-end: 16px; color: var(--h-navy); font-weight: 700; }

/* ---- frameworks ---- */
.tabs { display: flex; flex-wrap: wrap; gap: 6px; padding: 6px; background: var(--h-tabs); border-radius: 12px; width: max-content; max-width: 100%; }
.tabs [role="tab"] { font: 600 15px/1 var(--font); padding: 11px 16px; border: 0; border-radius: 8px; background: transparent; color: var(--h-muted); cursor: pointer; }
.tabs [role="tab"][aria-selected="true"] { background: var(--h-surface); color: var(--h-ink); box-shadow: 0 2px 8px rgba(16, 25, 43, 0.1); }
.tab-panels { min-width: 0; }
.tab-panels pre.code {
  /* Code's colours on the navy, each at least 8:1 on it. */
  --tok-keyword: #ff9bb0; --tok-string: var(--j-str); --tok-number: var(--j-lit); --tok-key: var(--j-key);
  --tok-comment: var(--h-stage-muted); --tok-tag: #7ee2a8; --tok-attr: #c9a7ff;
}
.tab-panels pre.code { margin: 0; padding: 22px 24px; border-radius: 14px; background: var(--h-stage); color: var(--h-stage-ink); font: 14px/1.65 var(--h-mono); overflow-x: auto; animation: rise 0.35s ease both; }
.tab-panels pre.code code { background: none; padding: 0; color: inherit; font-size: inherit; }
@keyframes rise { from { transform: translateY(8px); opacity: 0.4; } to { transform: none; opacity: 1; } }

/* ---- templates: one form in each theme, then a few of the library ---- */
.theme-picks { display: flex; flex-wrap: wrap; gap: 8px; }
.theme-picks button { font: 600 14px/1 var(--font); padding: 9px 13px; border-radius: 999px; border: 1px solid var(--h-line); background: var(--h-surface); color: var(--h-ink); cursor: pointer; transition: border-color 0.15s ease, background-color 0.15s ease; }
.theme-picks button:hover { border-color: var(--h-navy); }
.theme-picks button[aria-pressed="true"] { background: var(--h-fill); border-color: var(--h-fill); color: var(--h-on-fill); }
.tpl-code { margin: 4px 0 0; padding: 14px 16px; border-radius: 12px; background: var(--h-stage); color: var(--h-stage-ink); font: 13px/1.6 var(--h-mono); overflow-x: auto; }
.tpl-code code { background: none; padding: 0; color: inherit; font-size: inherit; }
.tpl-live { padding: 0; overflow: hidden; }
/* Room for the tallest theme, so the chapter does not jump as the theme changes. */
.tpl-host { display: grid; }
.tpl-host > .fd-form { min-height: 560px; }
.tpl-host .fd-form { transition: background-color 0.4s ease; }
.tpl-strip { grid-column: 1 / -1; display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr)); gap: 18px; }
.tpl-strip .tpl-card { width: auto; }
.tpl-card span { display: flex; align-items: baseline; justify-content: space-between; gap: 8px; }
.tpl-card small { font-size: 12px; font-weight: 600; color: var(--h-muted); white-space: nowrap; }
.tpl-more { grid-column: 1 / -1; margin: 0; }

/* ---- the real pages: two rows of screens that drift ---- */
.reel { display: grid; gap: 18px; margin-inline: calc(-1 * max(16px, (100vw - 1200px) / 2)); padding-block: 8px; overflow: hidden; mask-image: linear-gradient(90deg, transparent, #000 6%, #000 94%, transparent); }
/* Two copies of a row side by side; moving left by one copy (half the track) loops without a seam. */
.reel-track { display: flex; width: max-content; animation: drift 90s linear infinite; }
.reel-track + .reel-track { animation-direction: reverse; animation-duration: 100s; }
.reel-set { display: flex; gap: 18px; padding-inline-end: 18px; }
.reel:hover .reel-track, .reel:focus-within .reel-track { animation-play-state: paused; }
@keyframes drift { from { transform: translateX(0); } to { transform: translateX(-50%); } }
.reel-card { display: grid; gap: 8px; width: 300px; padding: 10px; background: var(--h-surface); border: 1px solid var(--h-line); border-radius: 14px; color: var(--h-ink); text-decoration: none; font-weight: 600; transition: transform 0.2s ease, box-shadow 0.2s ease; }
.reel-card img { width: 100%; height: auto; aspect-ratio: 8 / 5; object-fit: cover; object-position: top; border-radius: 8px; background: var(--h-paper); }
.reel-card span { padding-inline: 4px; font-size: 15px; }
.reel-card:hover { transform: translateY(-4px); box-shadow: 0 14px 30px rgba(16, 25, 43, 0.12); color: var(--h-ink); }

/* ---- the designer ---- */
.shot { display: block; padding: 10px; overflow: hidden; }
.shot img { display: block; width: 100%; height: auto; border-radius: 10px; transition: transform 0.6s ease; }
.shot:hover img { transform: scale(1.02); }

/* ---- numbers ---- */
.figures { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 18px; }
.figures li { display: grid; gap: 8px; align-content: start; padding: 22px; background: var(--h-surface); border: 1px solid var(--h-line); border-radius: 16px; }
.figures b { font: 800 clamp(40px, 5vw, 60px)/1 var(--h-display); color: var(--h-navy); font-variant-numeric: tabular-nums; }
.figures span { color: var(--h-muted); line-height: 1.5; }

/* ---- the finale ---- */
.finale { display: grid; gap: 18px; justify-items: start; padding: 96px var(--h-gutter); color: var(--h-stage-ink); background: repeating-linear-gradient(to bottom, transparent 0 43px, var(--h-rule) 43px 44px), linear-gradient(var(--h-stage-2), var(--h-stage)); }
.finale > h2 { font-size: clamp(32px, 4.4vw, 56px); line-height: 1.02; font-weight: 800; color: var(--h-stage-ink); }
.finale p { margin: 0; max-width: 60ch; color: var(--h-stage-muted); font-size: 18px; line-height: 1.6; }

/* ---- arriving as you scroll: from a visible resting state, where the browser can tie it to the scroll ---- */
@supports (animation-timeline: view()) {
  @media (prefers-reduced-motion: no-preference) {
    .chapter > *, .finale > * { animation: arrive linear both; animation-timeline: view(); animation-range: entry 0% entry 55%; }
    /* Movement only: a section is never faded, so its words keep their contrast wherever the reader lands. */
    @keyframes arrive { from { transform: translateY(40px); } to { transform: none; } }
  }
}

@media (prefers-reduced-motion: reduce) {
  .reel-track, .stage-json .caret, .tab-panels pre.code, .stage-form .fd-field.just-drawn { animation: none !important; }
  .reel { mask-image: none; }
  .reel { margin-inline: 0; }
  .reel-track { width: auto; }
  .reel-set { flex-wrap: wrap; padding: 0; }
  .reel-set[aria-hidden] { display: none; }
  .btn, .reel-card, .shot img, .theme-picks button, .tpl-host .fd-form, .power { transition: none; }
}

/* ---- narrower ---- */
@media (max-width: 960px) {
  .chapter-stack .chapter-copy { grid-template-columns: minmax(0, 1fr); }
  .chapter-stack .chapter-copy > .ticks { grid-column: 1; grid-row: auto; }
  .chapter { grid-template-columns: minmax(0, 1fr); gap: 32px; padding-block: 72px; }
  .chapter-flip .chapter-copy { order: 0; }
  .figures { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 760px) {
  .opening { padding-block: 48px 56px; gap: 28px; }
  .stage-panes { grid-template-columns: minmax(0, 1fr); min-height: 0; }
  .stage-json { max-height: 300px; border-inline-end: 0; border-bottom: 1px solid rgba(164, 179, 204, 0.18); font-size: 12px; }
  .reel-card { width: 230px; }
  /* Three of the library on a phone, then the way to the rest. */
  .tpl-strip .tpl-card:nth-child(n + 4) { display: none; }
  .figures { grid-template-columns: minmax(0, 1fr); }
  .btn-copy { max-width: 100%; }
  .btn-copy code { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
}