/* Layout: white sheet, one 1120px column, case cards drawn like a drawing's title block (标题栏). */
:root {
  --paper: #ffffff;
  --ink: #141820;
  --muted: #5b6472;
  --line: #e3e6eb;
  --wash: #f5f6f8;
  --accent: #1f56c9;
  --accent-wash: #eef3fd;
  --f-display: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --f-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --f-mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
  --s-1: 12px; --s-2: 14px; --s-3: 16px; --s-4: 20px; --s-5: 28px; --s-6: 40px; --s-7: 56px;
  --col: 1120px;
  color-scheme: light;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font-family: var(--f-body); font-size: var(--s-3); line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 2px; }
h1, h2, h3 { font-family: var(--f-display); text-wrap: balance; margin: 0; line-height: 1.25; }
h1 { font-size: clamp(30px, 5vw, var(--s-7)); font-weight: 700; letter-spacing: -0.01em; }
h2 { font-size: clamp(24px, 3vw, var(--s-6)); font-weight: 700; }
h3 { font-size: var(--s-4); font-weight: 500; }
p { margin: 0; }
.wrap {
  max-width: var(--col); margin: 0 auto;
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
}
.label {
  font-family: var(--f-mono); font-size: var(--s-1); letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--muted);
}
.lede { color: var(--muted); font-size: var(--s-4); max-width: 34em; line-height: 1.6; }
.muted { color: var(--muted); }
.todo {
  display: inline-block; font-family: var(--f-mono); font-size: 11px; letter-spacing: 0.04em;
  color: var(--accent); background: var(--accent-wash); padding: 1px 6px; border-radius: 3px; vertical-align: middle;
}

/* header */
body::before { content: ""; position: fixed; inset: 0 0 auto; height: env(safe-area-inset-top, 0px); z-index: 10; background: var(--paper); }
.site-head { position: sticky; top: env(safe-area-inset-top, 0px); z-index: 5; background: var(--paper); border-bottom: 1px solid var(--line); }
.site-head .wrap { display: flex; align-items: center; gap: var(--s-5); min-height: 60px; flex-wrap: wrap; }
.brand { font-weight: 700; text-decoration: none; letter-spacing: 0.02em; display: flex; align-items: baseline; gap: 8px; }
.brand small { font-family: var(--f-mono); font-weight: 400; font-size: 11px; color: var(--muted); }
.nav { display: flex; gap: var(--s-4); margin-left: auto; flex-wrap: wrap; font-size: var(--s-2); }
.nav a { text-decoration: none; color: var(--muted); }
.nav a:hover, .nav a[aria-current="page"] { color: var(--ink); }
.lang { font-family: var(--f-mono); font-size: var(--s-1); color: var(--muted); display: flex; gap: 6px; }
.lang b { color: var(--ink); font-weight: 500; }

/* sections */
section { padding-block: var(--s-7); }
section + section { border-top: 1px solid var(--line); }
.sec-head { display: grid; gap: var(--s-2); margin-bottom: var(--s-6); max-width: 46em; }

/* buttons */
.btns { display: flex; gap: var(--s-2); flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px; min-height: 44px; padding: 0 var(--s-4);
  border: 1px solid var(--ink); background: var(--ink); color: var(--paper);
  font: 500 var(--s-2)/1 var(--f-body); text-decoration: none; border-radius: 4px; cursor: pointer;
}
.btn.ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn:hover { background: var(--accent); border-color: var(--accent); color: #fff; }

/* hero */
.hero { padding-block: var(--s-7); }
.hero .wrap { display: grid; grid-template-columns: 1fr 1.1fr; gap: var(--s-6); align-items: center; }
.hero-copy { display: grid; gap: var(--s-5); min-width: 0; }
.hero-figure { min-width: 0; }

/* title-block figure: image + drawing-style caption row */
.tb { border: 1px solid var(--ink); background: var(--paper); }
.tb img { width: 100%; height: auto; aspect-ratio: 16 / 9; object-fit: cover; border-bottom: 1px solid var(--ink); }
.tb-row { display: grid; grid-template-columns: repeat(var(--cols, 4), minmax(0, 1fr)); }
.tb-row > div { padding: 6px 10px; border-left: 1px solid var(--ink); min-width: 0; }
.tb-row > div:first-child { border-left: 0; }
.tb-row dt, .tb-row .k { font-family: var(--f-mono); font-size: 10px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); }
.tb-row .v { font-size: var(--s-2); font-weight: 500; font-variant-numeric: tabular-nums; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

/* case cards */
.cases { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--s-5); }
.case { display: grid; gap: var(--s-3); text-decoration: none; align-content: start; }
.case .thumb { border: 1px solid var(--line); background: var(--wash); aspect-ratio: 16 / 10; overflow: hidden; display: grid; place-items: center; }
.case .thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s ease; }
.case:hover .thumb img { transform: scale(1.03); }
.case .thumb.empty { border-style: dashed; color: var(--muted); font-family: var(--f-mono); font-size: var(--s-1); }
.case h3 { font-size: var(--s-4); }
.case p { color: var(--muted); font-size: var(--s-2); }
.tags { display: flex; gap: 6px; flex-wrap: wrap; }
.tag { font-size: var(--s-1); border: 1px solid var(--line); padding: 1px 8px; border-radius: 99px; color: var(--muted); }

/* techniques */
.techs { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: var(--s-4); }
.tech { display: grid; gap: var(--s-2); align-content: start; min-width: 0; }
.tech .thumb { aspect-ratio: 4 / 3; border: 1px solid var(--line); overflow: hidden; background: var(--wash); }
.tech .thumb img { width: 100%; height: 100%; object-fit: cover; }
.tech h3 { font-size: var(--s-3); font-weight: 700; }
.tech p { font-size: var(--s-2); color: var(--muted); }

/* process timeline */
.steps { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(7, minmax(0, 1fr)); border-top: 2px solid var(--ink); }
.steps li { padding: var(--s-3) var(--s-3) 0 0; display: grid; gap: 6px; align-content: start; position: relative; min-width: 0; }
.steps li::before { content: ""; position: absolute; top: -7px; left: 0; width: 12px; height: 12px; border-radius: 50%; background: var(--paper); border: 2px solid var(--ink); }
.steps .n { font-family: var(--f-mono); font-size: var(--s-1); color: var(--accent); margin-top: 6px; }
.steps h3 { font-size: var(--s-3); font-weight: 700; }
.steps .d { font-family: var(--f-mono); font-size: var(--s-1); color: var(--muted); }
.steps p { font-size: var(--s-2); color: var(--muted); }
.total { margin-top: var(--s-5); display: flex; gap: var(--s-5); flex-wrap: wrap; align-items: baseline; }
.total strong { font-size: var(--s-5); font-variant-numeric: tabular-nums; }

/* packages */
.packs { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--s-4); }
.pack { border: 1px solid var(--line); padding: var(--s-5); display: grid; gap: var(--s-3); align-content: start; min-width: 0; }
.pack.main { border-color: var(--ink); }
.pack ul { margin: 0; padding-left: 1.1em; color: var(--muted); font-size: var(--s-2); display: grid; gap: 4px; }
.pack .meta { display: flex; gap: var(--s-4); font-family: var(--f-mono); font-size: var(--s-1); color: var(--muted); flex-wrap: wrap; }
.pack .price { font-size: var(--s-4); font-weight: 700; }

/* tables */
.tbl-wrap { overflow-x: auto; border: 1px solid var(--line); }
table { border-collapse: collapse; width: 100%; font-size: var(--s-2); min-width: 640px; }
th, td { text-align: left; padding: 10px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-family: var(--f-mono); font-weight: 500; font-size: var(--s-1); letter-spacing: 0.05em; color: var(--muted); background: var(--wash); text-transform: uppercase; }
tr:last-child td { border-bottom: 0; }
td.num { font-variant-numeric: tabular-nums; white-space: nowrap; }

/* checklist */
.check { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--s-5); }
.check ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.check li { display: grid; grid-template-columns: 18px 1fr; gap: 10px; font-size: var(--s-2); }
.check li::before { content: ""; width: 14px; height: 14px; border: 1.5px solid var(--ink); margin-top: 5px; }
.check .opt li::before { border-style: dashed; border-color: var(--muted); }
.check li span { color: var(--muted); display: block; }

/* demo slot */
.demo { border: 1px solid var(--line); background: var(--wash); aspect-ratio: 16 / 9; max-width: 100%; position: relative; display: grid; place-items: center; }
.demo iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.demo-cta { display: grid; gap: var(--s-2); justify-items: center; text-align: center; padding: var(--s-4); }

/* contact + footer */
.contact .wrap { display: grid; grid-template-columns: 1fr 1fr; gap: var(--s-6); align-items: end; }
.mail { font-family: var(--f-mono); font-size: var(--s-4); user-select: all; word-break: break-all; }
.site-foot { border-top: 1px solid var(--line); padding-block: var(--s-5); font-size: var(--s-1); color: var(--muted); }
.site-foot .wrap { display: flex; gap: var(--s-4); flex-wrap: wrap; justify-content: space-between; }

/* case page */
.case-head { display: grid; gap: var(--s-4); }
.result { font-size: var(--s-4); border-left: 3px solid var(--accent); padding-left: var(--s-3); max-width: 36em; }
.three { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--s-5); }
.three > div { display: grid; gap: var(--s-2); align-content: start; min-width: 0; }
.three p, .three li { color: var(--muted); font-size: var(--s-2); }
.three ul { margin: 0; padding-left: 1.1em; }
.gallery { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--s-4); }
.gallery figure { margin: 0; display: grid; gap: 6px; min-width: 0; }
.gallery img { border: 1px solid var(--line); aspect-ratio: 16 / 9; object-fit: cover; width: 100%; }
.gallery figcaption { font-size: var(--s-1); color: var(--muted); }
.faq { display: grid; gap: 0; border-top: 1px solid var(--line); }
.faq details { border-bottom: 1px solid var(--line); padding-block: var(--s-3); }
.faq summary { cursor: pointer; font-weight: 500; }
.faq details p { color: var(--muted); font-size: var(--s-2); margin-top: 8px; max-width: 46em; }

@media (max-width: 900px) {
  .site-head { position: static; }
  .hero .wrap, .contact .wrap { grid-template-columns: 1fr; }
  .cases, .packs, .three { grid-template-columns: 1fr; }
  .techs { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .steps { grid-template-columns: 1fr; border-top: 0; border-left: 2px solid var(--ink); }
  .steps li { padding: 0 0 var(--s-4) var(--s-4); }
  .steps li::before { top: 4px; left: -7px; }
  .steps .n { margin-top: 0; }
  .check, .gallery { grid-template-columns: 1fr; }
  .tb-row { --cols: 2 !important; }
  .tb-row > div:nth-child(3) { border-left: 0; }
  .tb-row > div:nth-child(n+3) { border-top: 1px solid var(--ink); }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } .case .thumb img { transition: none; } }

/* language switch */
.langsw { display: flex; gap: 10px; font-family: var(--f-mono); font-size: var(--s-1); letter-spacing: 0.04em; }
.langsw b { font-weight: 500; color: var(--ink); }
.langsw a { color: var(--muted); text-decoration: none; }
.langsw a:hover { color: var(--ink); }

/* ===== motion & polish (shared) ===== */
::selection { background: var(--accent-wash); color: var(--ink); }
html { scroll-padding-top: 72px; }
html.js .rv { opacity: 0; transform: translateY(16px); transition: opacity .7s cubic-bezier(.2,.65,.2,1), transform .7s cubic-bezier(.2,.65,.2,1); transition-delay: var(--d, 0s); }
html.js .rv.in { opacity: 1; transform: none; }
html.js .portrait.rv { transform: none; opacity: 1; clip-path: inset(0 0 100% 0 round 16px); transition: clip-path 1s cubic-bezier(.2,.65,.2,1); }
html.js .portrait.rv.in { clip-path: inset(0 round 16px); }
.btn { transition: background .25s, border-color .25s, color .25s, transform .15s; }
.btn:active { transform: scale(.98); }
.btn.ok { background: #1a7f4b; border-color: #1a7f4b; }
.card, .stat, .plan, .pack, .tech .thumb, .case .thumb, .slide .pic, .gallery img, .tb { transition: border-color .3s, transform .3s, box-shadow .3s; }
.card:hover, .stat:hover, .plan:hover, .pack:hover { border-color: var(--ink); transform: translateY(-2px); box-shadow: 0 14px 30px -22px rgba(20,24,32,.35); }
.slide .pic img, .gallery img, .tech .thumb img { transition: transform .6s cubic-bezier(.2,.65,.2,1); }
.slide .pic:hover img, .gallery figure:hover img, .tech:hover .thumb img { transform: scale(1.03); }
.more { border-bottom: 0; background: linear-gradient(var(--ink), var(--ink)) no-repeat 0 100% / 100% 1px; padding-bottom: 2px; transition: background-size .3s; }
.more:hover { background-size: 0 1px; background-position: 100% 100%; }
.site-head { transition: box-shadow .3s; }
.site-head.scrolled { box-shadow: 0 1px 0 var(--line), 0 10px 24px -20px rgba(20,24,32,.3); }
.faq details p { animation: faq-in .3s ease both; }
@keyframes faq-in { from { opacity: 0; transform: translateY(-4px); } to { opacity: 1; transform: none; } }
.faq summary::marker { color: var(--accent); }
.faq summary { list-style: none; display: flex; justify-content: space-between; gap: var(--s-3); align-items: center; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font-family: var(--f-mono); color: var(--muted); transition: transform .3s; flex: none; }
.faq details[open] summary::after { transform: rotate(45deg); }
.steps { position: relative; border-top-color: transparent; }
.steps::before { content: ""; position: absolute; left: 0; right: 0; top: -2px; height: 2px; background: var(--ink); transform-origin: left; transition: transform 1.3s cubic-bezier(.2,.65,.2,1); }
html.js .steps::before { transform: scaleX(0); }
html.js .steps.draw::before { transform: scaleX(1); }
.steps li::before { transition: background .4s; }
.steps li.in::before { background: var(--ink); }
@media (max-width: 900px) {
  .steps { border-left-color: transparent; }
  .steps::before { left: -2px; right: auto; top: 0; bottom: 0; width: 2px; height: auto; transform-origin: top; }
  html.js .steps::before { transform: scaleY(0); }
  html.js .steps.draw::before { transform: scaleY(1); }
}

/* before / after */
.ba { display: grid; grid-template-columns: 1fr 48px 1.15fr; gap: var(--s-4); align-items: start; }
.ba-arrow { align-self: center; }
.nw { white-space: nowrap; }
.ba-col { display: grid; gap: var(--s-2); min-width: 0; }
.ba-tag { font-family: var(--f-mono); font-size: var(--s-1); letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
.ba-arrow { font-size: var(--s-5); color: var(--muted); text-align: center; }
.ba-pic { border: 1px solid var(--line); border-radius: 12px; overflow: hidden; aspect-ratio: 16 / 10; background: var(--wash); }
.ba-pic img { width: 100%; height: 100%; object-fit: cover; }
.ba p { font-size: var(--s-2); color: var(--muted); }
.slide-mock { aspect-ratio: 16 / 10; border: 1px solid var(--line); border-radius: 12px; background: #fff; padding: 7% 8%; display: grid; align-content: start; gap: 5%; position: relative; overflow: hidden; font-size: clamp(9px, 1.1vw, 13px); line-height: 1.5; color: var(--ink); }
.slide-mock .t { font-weight: 700; font-size: 1.35em; padding-bottom: .4em; border-bottom: 2px solid #c8ced6; }
.slide-mock ul { margin: 0; padding-left: 1.2em; display: grid; gap: .45em; color: #3a4350; }
.slide-mock .pg { position: absolute; right: 6%; bottom: 5%; font-family: var(--f-mono); font-size: .85em; color: var(--muted); }
@media (max-width: 760px) { .ba { grid-template-columns: 1fr; } .ba-arrow { transform: rotate(90deg); } }

/* three things you do */
.trio { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; counter-reset: trio; }
.trio li { border: 1px solid var(--line); border-radius: 10px; padding: 20px; display: grid; gap: 8px; align-content: start; min-width: 0; }
.trio b { font-family: var(--f-mono); font-size: var(--s-1); color: var(--accent); font-weight: 500; }
.trio h3 { font-size: var(--s-4); font-weight: 700; }
.trio p { font-size: var(--s-2); color: var(--muted); }
.trio .t { font-size: var(--s-1); color: var(--muted); font-family: var(--f-mono); }
@media (max-width: 760px) { .trio { grid-template-columns: 1fr; } }

/* fit / not fit */
.fit { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--s-4); }
.fit > div { display: grid; gap: var(--s-2); align-content: start; min-width: 0; padding: 20px; border-radius: 10px; background: var(--wash); }
.fit h3 { font-size: var(--s-3); font-weight: 700; }
.fit ul { margin: 0; padding: 0; list-style: none; display: grid; gap: 8px; font-size: var(--s-2); color: var(--muted); }
.fit li { display: grid; grid-template-columns: 16px 1fr; gap: 10px; }
.fit li::before { content: "✓"; color: var(--accent); font-weight: 700; }
.fit .no li::before { content: "–"; color: var(--muted); }
@media (max-width: 760px) { .fit { grid-template-columns: 1fr; } }

/* screen-recorded clips in the case gallery */
.gallery video { border: 1px solid var(--line); aspect-ratio: 16 / 9; width: 100%; height: auto; object-fit: cover; display: block; background: #f5f8fb; }