:root {
  --ink: oklch(0.22 0.025 250);
  --muted: oklch(0.52 0.025 250);
  --paper: oklch(0.975 0.012 88);
  --panel: oklch(0.995 0.005 88);
  --line: oklch(0.86 0.018 88);
  --accent: oklch(0.63 0.17 38);
  --accent-dark: oklch(0.48 0.15 38);
  --teal: oklch(0.48 0.085 187);
  --max: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: "Trebuchet MS", "Microsoft YaHei", sans-serif; line-height: 1.6; }
a { color: inherit; }
button, input, select { font: inherit; }
button, .button { min-height: 44px; }
.shell { width: min(calc(100% - 40px), var(--max)); margin-inline: auto; }
.site-header { border-bottom: 1px solid var(--line); background: color-mix(in oklch, var(--paper) 92%, transparent); position: sticky; top: 0; z-index: 20; backdrop-filter: blur(14px); }
.nav { min-height: 68px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { text-decoration: none; font-weight: 600; letter-spacing: -0.03em; font-size: 20px; }
.brand small { display: block; font: 10px "IBM Plex Mono", monospace; letter-spacing: .12em; color: var(--muted); text-transform: uppercase; }
.nav-links { display: flex; align-items: center; gap: 22px; font-size: 14px; }
.nav-links a { text-decoration: none; }
.nav-links a:hover { color: var(--accent-dark); }
.language { border: 1px solid var(--line); padding: 7px 10px; }
.hero { padding: 96px 0 70px; display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(290px, .75fr); gap: 70px; align-items: end; }
.eyebrow { font: 12px Consolas, monospace; text-transform: uppercase; letter-spacing: .12em; color: var(--accent-dark); }
h1, h2, h3 { line-height: 1.08; text-wrap: balance; letter-spacing: -.035em; }
h1 { font-size: clamp(48px, 7.5vw, 96px); margin: 18px 0 24px; font-weight: 500; }
h2 { font-size: clamp(34px, 4vw, 58px); margin: 0 0 22px; font-weight: 500; }
h3 { font-size: 23px; }
.lead { font-size: clamp(18px, 2vw, 23px); max-width: 700px; color: var(--muted); text-wrap: pretty; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 10px; padding: 11px 18px; background: var(--ink); color: white; border: 1px solid var(--ink); text-decoration: none; cursor: pointer; }
.button:hover { background: var(--accent-dark); border-color: var(--accent-dark); }
.button.secondary { background: transparent; color: var(--ink); border-color: var(--line); }
.button.secondary:hover { border-color: var(--ink); }
.actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 32px; }
.signal { border-top: 2px solid var(--ink); padding-top: 18px; }
.signal strong { display: block; font-size: 28px; font-weight: 500; margin-bottom: 8px; }
.signal p { color: var(--muted); margin: 0; }
.section { padding: 72px 0; border-top: 1px solid var(--line); }
.section-head { display: grid; grid-template-columns: .65fr 1.35fr; gap: 40px; margin-bottom: 44px; }
.section-head p { max-width: 660px; color: var(--muted); margin: 0; font-size: 18px; }
.tool-list { border-top: 1px solid var(--ink); }
.tool-row { display: grid; grid-template-columns: 55px 1fr 1fr auto; align-items: center; gap: 24px; padding: 24px 0; border-bottom: 1px solid var(--line); text-decoration: none; }
.tool-row:hover { color: var(--accent-dark); }
.tool-row .num { font: 12px "IBM Plex Mono", monospace; color: var(--muted); }
.tool-row strong { font-size: 23px; font-weight: 500; }
.tool-row span { color: var(--muted); }
.brief-grid { display: grid; grid-template-columns: 1.3fr .7fr; gap: 48px; }
.brief-item { padding: 22px 0; border-top: 1px solid var(--line); }
.brief-item time, .meta { font: 11px "IBM Plex Mono", monospace; color: var(--muted); text-transform: uppercase; letter-spacing: .08em; }
.brief-item h3 { margin: 10px 0; }
.brief-item p { color: var(--muted); }
.note { background: oklch(0.93 0.045 77); padding: 24px; border: 1px solid color-mix(in oklch, var(--accent) 25%, var(--line)); }
.footer { border-top: 1px solid var(--line); padding: 32px 0 50px; color: var(--muted); font-size: 13px; }
.footer .shell { display: flex; justify-content: space-between; gap: 20px; }

.page-head { padding: 76px 0 44px; border-bottom: 1px solid var(--line); }
.page-head h1 { font-size: clamp(44px, 6vw, 76px); max-width: 900px; }
.tool-layout { display: grid; grid-template-columns: minmax(0, 1fr) 310px; gap: 38px; padding: 46px 0 80px; }
.workbench { background: var(--panel); border: 1px solid var(--line); }
.workbench-head { padding: 20px 22px; border-bottom: 1px solid var(--line); display: flex; align-items: center; justify-content: space-between; gap: 15px; }
.dropzone { margin: 22px; min-height: 260px; border: 1.5px dashed oklch(0.67 0.035 250); display: grid; place-items: center; text-align: center; padding: 40px; cursor: pointer; background: var(--paper); }
.dropzone.dragging { border-color: var(--accent); background: oklch(0.96 0.035 70); }
.dropzone input { display: none; }
.dropzone strong { display: block; font-size: 24px; }
.dropzone span { color: var(--muted); }
.controls { border-top: 1px solid var(--line); padding: 22px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.field label { display: block; font: 11px "IBM Plex Mono", monospace; text-transform: uppercase; letter-spacing: .08em; margin-bottom: 7px; }
.field select, .field input[type="range"] { width: 100%; }
.field select { min-height: 44px; border: 1px solid var(--line); background: white; padding: 8px; }
.compact-input { width: 100%; min-height: 42px; border: 1px solid var(--line); margin-top: 8px; padding: 8px; }
.queue-actions { margin: 0 22px; padding: 14px 0; border-top: 1px solid var(--line); display: flex; justify-content: space-between; align-items: center; gap: 16px; }
.queue-actions > div { display: flex; align-items: center; gap: 14px; }
.text-button { border: 0; background: transparent; color: var(--muted); cursor: pointer; text-decoration: underline; min-height: 44px; }
.tool-error { margin: 0 22px 14px; padding: 12px 14px; border: 1px solid oklch(0.66 0.16 25); color: oklch(0.42 0.16 25); background: oklch(0.95 0.035 25); }
.queue { padding: 0 22px 22px; }
.queue-item { display: grid; grid-template-columns: 94px 1fr auto; gap: 16px; align-items: center; padding: 15px 0; border-top: 1px solid var(--line); }
.item-actions { display: flex; align-items: center; gap: 8px; }
.remove-button { width: 44px; height: 44px; border: 1px solid var(--line); background: transparent; cursor: pointer; font-size: 20px; }
.remove-button:hover { border-color: var(--ink); }
.preview-wrap { width: 94px; aspect-ratio: 4/3; overflow: hidden; position: relative; background: #eee; }
.preview-wrap img { width: 100%; height: 100%; object-fit: cover; }
.safe-area { position: absolute; inset: 10%; border: 1px dashed white; box-shadow: 0 0 0 999px rgba(0,0,0,.16); pointer-events: none; }
.queue-item h3 { font-size: 16px; margin: 0 0 3px; }
.queue-item p { margin: 0; color: var(--muted); font-size: 13px; }
.sidebar { border-top: 2px solid var(--ink); }
.sidebar section { padding: 20px 0; border-bottom: 1px solid var(--line); }
.sidebar h3 { font-size: 17px; margin: 0 0 10px; }
.sidebar p, .sidebar li { font-size: 14px; color: var(--muted); }
.article { max-width: 760px; padding: 56px 0 100px; }
.article h2 { font-size: 34px; margin-top: 52px; }
.article p, .article li { font-size: 18px; color: color-mix(in oklch, var(--ink) 86%, var(--muted)); }
.fact { border-block: 1px solid var(--ink); padding: 24px 0; margin: 34px 0; font-size: 22px; }
.status { font: 12px "IBM Plex Mono", monospace; color: var(--teal); }
.hidden { display: none !important; }

@media (max-width: 820px) {
  .nav-links a:not(.language) { display: none; }
  .hero, .section-head, .brief-grid, .tool-layout { grid-template-columns: 1fr; }
  .hero { padding-top: 60px; gap: 42px; }
  .tool-row { grid-template-columns: 36px 1fr auto; }
  .tool-row > span:not(.num) { display: none; }
  .controls { grid-template-columns: 1fr; }
  .sidebar { order: -1; }
}

@media (max-width: 520px) {
  .shell { width: min(calc(100% - 24px), var(--max)); }
  h1 { font-size: 46px; }
  .dropzone { margin: 12px; min-height: 220px; padding: 24px 14px; }
  .controls, .queue { padding-inline: 12px; }
  .queue-item { grid-template-columns: 74px 1fr; }
  .queue-item .button { grid-column: 1 / -1; }
  .preview-wrap { width: 74px; }
  .footer .shell { flex-direction: column; }
}