/* /ai-agents-for-photo-and-video-editing — "cutting room" field manual.
   Newsprint paper, ink, one record-red signal, timecode section markers,
   dark recipe cards. Light by default; follows the system dark scheme. */

:root {
  --paper: #f2efe6;
  --paper-2: #e9e5d8;
  --card: #fbfaf5;
  --ink: #17160f;
  --ink-2: #47443a;
  --muted: #6c685c;
  --rule: #d6d0bf;
  --rule-strong: #17160f;
  --signal: #c8361a;
  --signal-ink: #ffffff;
  --signal-soft: #f6dcd2;
  --term: #191a17;
  --term-2: #24261f;
  --term-ink: #e9e5d6;
  --term-dim: #9c9886;
  --term-key: #f0b44c;
  --term-str: #9fd18a;
  --term-flag: #f08a6a;
  --track-v: #2f5f73;
  --track-a: #6b7d3a;
  --track-c: #b8892a;
  --display: "Archivo", "Helvetica Neue", Arial, sans-serif;
  --text: "Source Serif 4", Georgia, "Times New Roman", serif;
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --measure: 40rem;
  --gutter: clamp(1rem, 4vw, 2.5rem);
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #13130f;
    --paper-2: #1b1b16;
    --card: #1c1c17;
    --ink: #ece8db;
    --ink-2: #c9c4b4;
    --muted: #9a9585;
    --rule: #34332b;
    --rule-strong: #ece8db;
    --signal: #ff6a45;
    --signal-ink: #160c08;
    --signal-soft: #3a1d14;
    --term: #0c0c0a;
    --term-2: #171713;
    --track-v: #6aa3bb;
    --track-a: #a4b86a;
    --track-c: #e0b357;
  }
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 5rem; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 1.0625rem/1.65 var(--text);
  font-optical-sizing: auto;
  text-rendering: optimizeLegibility;
}

img, svg { display: block; max-width: 100%; }

a { color: inherit; text-decoration-color: var(--signal); text-decoration-thickness: 0.09em; text-underline-offset: 0.18em; }
a:hover { color: var(--signal); }
a:focus-visible, button:focus-visible, summary:focus-visible { outline: 2px solid var(--signal); outline-offset: 3px; border-radius: 2px; }

.skip { position: absolute; left: -999px; top: 0; background: var(--ink); color: var(--paper); padding: 0.6rem 1rem; z-index: 10; }
.skip:focus { left: 1rem; top: 1rem; }

.wrap { width: min(74rem, 100%); margin: 0 auto; padding: 0 var(--gutter); }

/* ---------- Masthead ---------- */

.masthead { border-bottom: 1px solid var(--rule-strong); background: var(--paper); position: sticky; top: 0; z-index: 5; }
.masthead .wrap { display: flex; align-items: center; justify-content: space-between; gap: 1rem; min-height: 3.75rem; }
.brand { display: inline-flex; align-items: baseline; gap: 0.7rem; text-decoration: none; font: 800 1.45rem/1 var(--display); letter-spacing: -0.02em; }
.brand small { font: 500 0.7rem/1 var(--mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); }
.brand small::before { content: ""; display: inline-block; width: 0.5rem; height: 0.5rem; border-radius: 50%; background: var(--signal); margin-right: 0.45rem; vertical-align: 0.05rem; }
.masthead-nav { display: flex; align-items: center; gap: 1.25rem; font: 500 0.9rem/1 var(--display); }
.masthead-nav a:not(.btn) { text-decoration: none; }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem; padding: 0.7rem 1.1rem; font: 600 0.92rem/1 var(--display); text-decoration: none; border: 1.5px solid var(--ink); border-radius: 0; cursor: pointer; }
.btn-solid { background: var(--ink); color: var(--paper); }
.btn-solid:hover { background: var(--signal); border-color: var(--signal); color: var(--signal-ink); }
.btn-line { background: transparent; color: var(--ink); }
.btn-line:hover { background: var(--ink); color: var(--paper); }

/* ---------- Hero ---------- */

.hero { padding: clamp(2.5rem, 7vw, 5rem) 0 clamp(2rem, 5vw, 3.5rem); border-bottom: 1px solid var(--rule); }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1fr); gap: 2.5rem; }
.slate { display: flex; flex-wrap: wrap; gap: 0 1.5rem; margin: 0 0 1.4rem; font: 500 0.75rem/1.8 var(--mono); letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); }
.slate b { color: var(--ink); font-weight: 600; }
.slate .rec { color: var(--signal); }
.slate .rec::before { content: "●"; margin-right: 0.35rem; animation: rec 1.6s steps(1) infinite; }
@keyframes rec { 50% { opacity: 0.15; } }

h1 { font: 800 clamp(2.4rem, 6.4vw, 4.6rem)/0.98 var(--display); font-stretch: 88%; letter-spacing: -0.035em; margin: 0; max-width: 16ch; }
h1 em { font-style: normal; color: var(--signal); }
.lede { font-size: clamp(1.1rem, 1.8vw, 1.3rem); line-height: 1.55; color: var(--ink-2); max-width: 38rem; margin: 1.5rem 0 0; }
.hero-meta { display: grid; grid-template-columns: repeat(3, minmax(0, auto)); justify-content: start; gap: 0.25rem 2rem; margin: 2rem 0 0; font: 0.82rem/1.45 var(--display); }
.hero-meta dt { font: 500 0.68rem/1.4 var(--mono); text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); }
.hero-meta dd { margin: 0.15rem 0 0; font-weight: 500; }

/* Timeline figure */
.timeline { margin: 0; border: 1.5px solid var(--rule-strong); background: var(--card); }
.timeline svg { width: 100%; height: auto; }
.timeline figcaption { border-top: 1px solid var(--rule); padding: 0.7rem 0.9rem; font: 0.82rem/1.45 var(--display); color: var(--muted); }
.timeline figcaption b { color: var(--ink); font-weight: 600; }
.tl-bg { fill: var(--card); }
.tl-ruler { fill: var(--paper-2); }
.tl-tick { stroke: var(--muted); stroke-width: 1; }
.tl-tc, .tl-label { font: 500 10px var(--mono); fill: var(--muted); letter-spacing: 0.04em; }
.tl-label { font-weight: 600; fill: var(--ink); }
.tl-lane { fill: none; stroke: var(--rule); stroke-width: 1; }
.tl-clip-v { fill: var(--track-v); }
.tl-clip-a { fill: var(--track-a); }
.tl-clip-c { fill: var(--track-c); }
.tl-clip-text { font: 600 10px var(--display); fill: #fff; letter-spacing: 0.02em; }
.tl-wave { fill: none; stroke: #fff; stroke-width: 1; opacity: 0.7; }
.tl-head { stroke: var(--signal); stroke-width: 2; }
.tl-head-cap { fill: var(--signal); }
.tl-duck { fill: none; stroke: var(--ink); stroke-width: 1.25; stroke-dasharray: 3 3; }
.tl-note { font: italic 500 11px var(--text); fill: var(--ink-2); }

/* ---------- Body layout ---------- */

.body-grid { display: grid; grid-template-columns: minmax(0, 1fr); gap: 2rem; padding-top: 2.5rem; padding-bottom: 4rem; }
.article { min-width: 0; }

.toc { font: 0.9rem/1.4 var(--display); }
.toc-title { font: 600 0.7rem/1 var(--mono); text-transform: uppercase; letter-spacing: 0.1em; color: var(--muted); margin: 0 0 0.8rem; }
.toc ol { list-style: none; margin: 0; padding: 0; border-left: 1px solid var(--rule); }
.toc li { margin: 0; }
.toc a { display: grid; grid-template-columns: 3.4rem minmax(0, 1fr); gap: 0.25rem; padding: 0.38rem 0 0.38rem 0.8rem; text-decoration: none; color: var(--ink-2); border-left: 2px solid transparent; margin-left: -1.5px; }
.toc a span { font: 500 0.72rem/1.6 var(--mono); color: var(--muted); }
.toc a:hover, .toc a.current { color: var(--ink); border-left-color: var(--signal); }
.toc a.current span { color: var(--signal); }

/* ---------- Chapters ---------- */

.chapter { padding: 2.75rem 0 0.5rem; border-top: 1px solid var(--rule); margin-top: 2.25rem; }
.chapter:first-child { border-top: 0; margin-top: 0; padding-top: 0; }
.tc { display: inline-flex; align-items: center; gap: 0.6rem; font: 500 0.75rem/1 var(--mono); letter-spacing: 0.06em; color: var(--signal); margin: 0 0 0.9rem; text-transform: uppercase; }
.tc::before { content: ""; width: 1.4rem; height: 1px; background: var(--signal); }
h2 { font: 800 clamp(1.7rem, 3.6vw, 2.5rem)/1.05 var(--display); font-stretch: 92%; letter-spacing: -0.025em; margin: 0 0 1.1rem; max-width: 24ch; }
h3 { font: 700 1.2rem/1.25 var(--display); letter-spacing: -0.01em; margin: 2rem 0 0.6rem; }
.article p, .article li { max-width: var(--measure); }
.article p { margin: 0 0 1rem; }
.article ul, .article ol { padding-left: 1.2rem; margin: 0 0 1.2rem; }
.article li { margin: 0 0 0.45rem; }
.article li::marker { color: var(--signal); }
.article strong { font-weight: 650; }
code { font: 0.86em/1 var(--mono); background: var(--paper-2); padding: 0.12em 0.32em; border-radius: 2px; overflow-wrap: anywhere; }

/* Pull line */
.pull { font: 700 clamp(1.25rem, 2.4vw, 1.6rem)/1.3 var(--display); letter-spacing: -0.015em; border-left: 4px solid var(--signal); padding: 0.2rem 0 0.2rem 1.1rem; margin: 1.8rem 0; max-width: 34rem; }

/* Division-of-labor ledger */
.split { display: grid; grid-template-columns: minmax(0, 1fr); border: 1.5px solid var(--rule-strong); margin: 1.6rem 0; background: var(--card); }
.split > div { padding: 1.1rem 1.2rem 0.6rem; }
.split > div + div { border-top: 1px solid var(--rule); }
.split h3 { margin: 0 0 0.6rem; font-size: 0.78rem; font-family: var(--mono); font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em; }
.split .who-agent h3 { color: var(--track-v); }
.split .who-wurt h3 { color: var(--signal); }
.split .who-you h3 { color: var(--track-a); }
.split ul { list-style: none; padding: 0; }
.split li { position: relative; padding-left: 1.1rem; font-size: 0.97rem; }
.split li::before { content: "—"; position: absolute; left: 0; color: var(--muted); }

/* Walkthrough steps */
.article ol.steps { list-style: none; padding: 0; margin: 1.8rem 0 0; }
.article ol.steps > li { max-width: none; margin: 0; padding: 0 0 2.2rem 1.6rem; border-left: 2px solid var(--rule); position: relative; scroll-margin-top: 5rem; }
.article ol.steps > li::before { content: ""; position: absolute; left: -7px; top: 0.35rem; width: 12px; height: 12px; background: var(--paper); border: 2px solid var(--signal); border-radius: 50%; }
.article ol.steps > li:last-child { border-left-color: transparent; padding-bottom: 0.5rem; }
.article ol.steps > li > ul { padding-left: 1.2rem; }
.steps h3 { margin: 0 0 0.7rem; font-size: clamp(1.2rem, 2.2vw, 1.45rem); display: flex; flex-wrap: wrap; align-items: baseline; gap: 0.2rem 0.7rem; }
.step-n { font: 600 0.72rem/1 var(--mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--paper); background: var(--signal); padding: 0.32rem 0.45rem; }
@media (prefers-color-scheme: dark) { .step-n { color: var(--signal-ink); } }
.steps strong { font-family: var(--display); font-weight: 700; }

/* Folder tree */
.tree { font: 0.86rem/1.7 var(--mono); background: var(--card); border: 1px solid var(--rule); padding: 1rem 1.2rem; margin: 1.2rem 0 1.4rem; white-space: pre; overflow-x: auto; max-width: 100%; }
.tree .c { color: var(--muted); }
.tree .k { color: var(--signal); font-weight: 600; }

/* Recipe cards */
.recipe { background: var(--term); color: var(--term-ink); margin: 1.5rem 0 1.8rem; border-radius: 3px; overflow: hidden; max-width: 46rem; }
.recipe-head { display: flex; align-items: center; justify-content: space-between; gap: 0.8rem; padding: 0.6rem 0.9rem; background: var(--term-2); font: 500 0.74rem/1.3 var(--mono); letter-spacing: 0.04em; color: var(--term-dim); }
.recipe-head b { color: var(--term-ink); font-weight: 600; }
.recipe-head .num { color: var(--term-key); margin-right: 0.5rem; }
.recipe pre { margin: 0; padding: 1rem 1.1rem; font: 0.84rem/1.6 var(--mono); overflow-x: auto; white-space: pre; tab-size: 2; }
.recipe pre .cm { color: var(--term-dim); }
.recipe pre .fl { color: var(--term-flag); }
.recipe pre .st { color: var(--term-str); }
.recipe-why { border-top: 1px solid #2f302a; padding: 0.8rem 1.1rem 0.9rem; font: 0.88rem/1.55 var(--display); color: #cfcab9; }
.recipe-why b { color: var(--term-key); font-weight: 600; }
.recipe-why code { background: #2f302a; color: var(--term-key); }
.recipe.paper .recipe-why { border-top-color: var(--rule); color: var(--ink-2); }
.copy { display: inline-flex; align-items: center; gap: 0.5rem; }
.copy button { font: 600 0.72rem/1 var(--mono); letter-spacing: 0.05em; text-transform: uppercase; background: transparent; color: var(--term-ink); border: 1px solid #4a4b42; padding: 0.42rem 0.6rem; cursor: pointer; border-radius: 2px; }
.copy button:hover { border-color: var(--term-key); color: var(--term-key); }
.copied { font: 0.72rem/1 var(--mono); color: var(--term-str); min-width: 0; }

/* Light card variant (brief file, instruction samples) */
.recipe.paper { background: var(--card); color: var(--ink); border: 1.5px solid var(--rule-strong); border-radius: 0; }
.recipe.paper .recipe-head { background: var(--paper-2); color: var(--muted); }
.recipe.paper .recipe-head b { color: var(--ink); }
.recipe.paper .recipe-head .num { color: var(--signal); }
.recipe.paper pre { white-space: pre-wrap; overflow-wrap: anywhere; }
.recipe.paper pre .cm { color: var(--muted); }
.recipe.paper .copy button { color: var(--ink); border-color: var(--rule-strong); }
.recipe.paper .copy button:hover { color: var(--signal); border-color: var(--signal); }
.recipe.paper .copied { color: var(--track-a); }

/* Gotcha list */
.gotchas { list-style: none; padding: 0 !important; counter-reset: g; display: grid; grid-template-columns: minmax(0, 1fr); gap: 0; border-top: 1.5px solid var(--rule-strong); margin: 1.4rem 0 1.8rem; max-width: 46rem; }
.gotchas li { counter-increment: g; display: grid; grid-template-columns: 2.6rem minmax(0, 1fr); gap: 0.6rem; padding: 0.95rem 0; border-bottom: 1px solid var(--rule); margin: 0 !important; max-width: none !important; }
.gotchas li::before { content: counter(g, decimal-leading-zero); font: 600 0.8rem/1.75 var(--mono); color: var(--signal); }
.gotchas b { display: block; font: 700 1rem/1.35 var(--display); margin-bottom: 0.2rem; }
.gotchas p { margin: 0 !important; font-size: 0.97rem; color: var(--ink-2); }

/* Spec sheet */
.sheet-wrap { margin: 1.4rem 0 1rem; max-width: 100%; }
table.sheet { width: 100%; border-collapse: collapse; font: 0.88rem/1.45 var(--display); background: var(--card); border: 1.5px solid var(--rule-strong); }
table.sheet caption { text-align: left; font: 600 0.72rem/1 var(--mono); text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); padding: 0 0 0.6rem; }
table.sheet th, table.sheet td { text-align: left; vertical-align: top; padding: 0.65rem 0.8rem; border-bottom: 1px solid var(--rule); }
table.sheet thead th { font: 600 0.7rem/1.3 var(--mono); text-transform: uppercase; letter-spacing: 0.07em; background: var(--ink); color: var(--paper); border-bottom: 0; }
table.sheet tbody th { font-weight: 700; }
table.sheet td small { display: block; color: var(--muted); font-size: 0.78rem; }
.fine { font: 0.82rem/1.5 var(--display); color: var(--muted); max-width: var(--measure); }

/* Safe-zone diagram */
.safe { display: grid; grid-template-columns: minmax(0, 1fr); gap: 1.2rem; align-items: center; margin: 1.6rem 0; }
.safe svg { width: min(15rem, 70vw); height: auto; margin: 0 auto; }
.sz-frame { fill: var(--card); stroke: var(--rule-strong); stroke-width: 2; }
.sz-ui { fill: var(--signal-soft); }
.sz-ui-line { stroke: var(--signal); stroke-width: 1; stroke-dasharray: 4 3; fill: none; }
.sz-safe { fill: none; stroke: var(--track-a); stroke-width: 2; }
.sz-text { font: 600 11px var(--mono); fill: var(--ink-2); }
.sz-cap { fill: var(--ink); }
.sz-cap-text { font: 700 12px var(--display); fill: var(--paper); }

/* Check strip (how agents check their work) */
.checks { display: grid; grid-template-columns: minmax(0, 1fr); gap: 0; border: 1.5px solid var(--rule-strong); margin: 1.5rem 0; background: var(--card); }
.checks > div { padding: 1rem 1.1rem; }
.checks > div + div { border-top: 1px solid var(--rule); }
.checks h3 { margin: 0 0 0.35rem; font-size: 1rem; }
.checks p { margin: 0 !important; font-size: 0.95rem; color: var(--ink-2); }
.checks .k { font: 600 0.7rem/1 var(--mono); color: var(--signal); letter-spacing: 0.06em; text-transform: uppercase; display: block; margin-bottom: 0.45rem; }

/* For agents */
.for-agents { background: var(--ink); color: var(--paper); padding: clamp(1.4rem, 3vw, 2.2rem); margin-top: 2.25rem; }
.for-agents .tc { color: var(--signal); }
.for-agents h2 { color: var(--paper); }
.for-agents p, .for-agents li { color: var(--paper); opacity: 0.92; }
.for-agents a { color: var(--paper); }
.for-agents a:hover { color: var(--signal); }
.for-agents code { background: rgba(255, 255, 255, 0.1); color: var(--paper); }
.for-agents .facts { font: 0.86rem/1.6 var(--mono); border: 1px solid rgba(255, 255, 255, 0.25); padding: 1rem 1.1rem; margin: 1.2rem 0 0.4rem; max-width: 46rem; }
.for-agents .facts p { margin: 0 0 0.35rem; max-width: none; }
.for-agents .facts p:last-child { margin: 0; }
@media (prefers-color-scheme: dark) {
  .for-agents { background: var(--paper-2); border: 1px solid var(--rule); }
  .for-agents h2, .for-agents p, .for-agents li, .for-agents a { color: var(--ink); }
}

/* FAQ */
.faq details { border-bottom: 1px solid var(--rule); max-width: 46rem; }
.faq details:first-of-type { border-top: 1.5px solid var(--rule-strong); }
.faq summary { cursor: pointer; list-style: none; padding: 1rem 2rem 1rem 0; font: 700 1.04rem/1.35 var(--display); position: relative; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; position: absolute; right: 0.2rem; top: 0.85rem; font: 500 1.3rem/1 var(--mono); color: var(--signal); }
.faq details[open] summary::after { content: "–"; }
.faq details p { margin: 0 0 1.1rem; color: var(--ink-2); }

/* Sources */
.sources ol { font: 0.88rem/1.55 var(--display); color: var(--ink-2); }
.sources li { max-width: 46rem; }
.note { font: 0.82rem/1.5 var(--display); color: var(--muted); }

/* Closing */
.closing { margin-top: 3rem; border: 1.5px solid var(--rule-strong); padding: clamp(1.4rem, 3vw, 2.2rem); background: var(--card); position: relative; }
.closing::before { content: "END OF REEL"; position: absolute; top: -0.6rem; left: 1.1rem; background: var(--paper); padding: 0 0.5rem; font: 600 0.7rem/1.2 var(--mono); letter-spacing: 0.12em; color: var(--signal); }
.closing h2 { margin-bottom: 0.6rem; }
.actions { display: flex; flex-wrap: wrap; gap: 0.7rem; margin-top: 1.2rem; }

/* Footer */
.colophon { border-top: 1px solid var(--rule-strong); padding: 1.5rem 0 2.5rem; font: 0.85rem/1.5 var(--display); color: var(--muted); }
.colophon .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 1rem; }
.colophon nav { display: flex; flex-wrap: wrap; gap: 1.1rem; }
.colophon a { text-decoration: none; }
.colophon a:hover { text-decoration: underline; }

/* ---------- Wide screens ---------- */

@media (min-width: 46rem) {
  .split { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .split > div + div { border-top: 0; border-left: 1px solid var(--rule); }
  .checks { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .checks > div:nth-child(2) { border-top: 0; border-left: 1px solid var(--rule); }
  .checks > div:nth-child(4) { border-left: 1px solid var(--rule); }
  .safe { grid-template-columns: 15rem minmax(0, 1fr); }
  .safe svg { margin: 0; }
}

@media (min-width: 64rem) {
  .hero-grid { grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); align-items: end; gap: 3rem; }
  .body-grid { grid-template-columns: 15rem minmax(0, 1fr); gap: 3.5rem; }
  .toc { position: sticky; top: 5.5rem; align-self: start; max-height: calc(100vh - 7rem); overflow-y: auto; }
}

/* ---------- Phones ---------- */

@media (max-width: 40rem) {
  .masthead-nav a:not(.btn) { display: none; }
  .hero-meta { grid-template-columns: minmax(0, 1fr); gap: 0.7rem; }
  table.sheet thead { display: none; }
  table.sheet caption { display: block; padding: 0.7rem 0.8rem 0.2rem; }
  table.sheet, table.sheet tbody, table.sheet tr, table.sheet th, table.sheet td { display: block; width: 100%; }
  table.sheet tr { border-bottom: 1.5px solid var(--rule-strong); padding: 0.4rem 0; }
  table.sheet tr:last-child { border-bottom: 0; }
  table.sheet th, table.sheet td { border-bottom: 0; padding: 0.3rem 0.8rem; }
  table.sheet tbody th { padding-top: 0.6rem; font-size: 1rem; }
  table.sheet td[data-k]::before { content: attr(data-k); display: block; font: 600 0.66rem/1.4 var(--mono); text-transform: uppercase; letter-spacing: 0.07em; color: var(--muted); }
  .recipe pre { font-size: 0.78rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .slate .rec::before { animation: none; }
}

@media print {
  .masthead, .toc, .copy, .actions, .skip { display: none !important; }
  body { background: #fff; color: #000; }
  .recipe { background: #fff; color: #000; border: 1px solid #000; }
  .recipe pre .cm, .recipe pre .fl, .recipe pre .st { color: #000; }
  .for-agents { background: #fff; color: #000; border: 1px solid #000; }
  .for-agents h2, .for-agents p, .for-agents li { color: #000; }
}