/* 型号主导：黑白为主，超大型号字是视觉重点，红色只用于操作和强调；全站只用思源黑体。 */
:root {
  --ink: #111111;
  --deep: #000000;
  --ground: #f1f1ef;
  --ground-soft: #f3f4f5;
  --line: #d4d4d1;
  --line-dark: #3b3b3b;
  --muted: #55554f;
  --muted-dark: #bdbdb8;
  --red: #c32f1d;
  --red-hover: #a32515;
  --radius: 2px;
  --gutter: clamp(16px, 4.4vw, 64px);
  --space: clamp(64px, 8vw, 120px);
  color-scheme: light;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scrollbar-color: #9aa1a8 transparent; }
body { margin: 0; background: #fff; color: var(--ink); font-family: "Noto Sans SC", "PingFang SC", Arial, sans-serif; font-size: 17px; line-height: 1.65; -webkit-font-smoothing: antialiased; }
::selection { background: var(--ink); color: #fff; }
input, textarea { caret-color: var(--red); }
a { color: inherit; text-decoration: none; }
a, button { transition: color .15s ease, background-color .15s ease, border-color .15s ease, transform .15s ease; }
:focus-visible { outline: 3px solid var(--red); outline-offset: 3px; }
body { display: flex; flex-direction: column; min-height: 100vh; }
main { flex: 1 0 auto; }
main:focus { outline: none; }
h1, h2, h3, p, dl, dd, figure, ol { margin: 0; }
h1, h2, h3 { color: var(--ink); font-family: inherit; font-weight: 700; text-wrap: balance; }
h1 { font-size: clamp(42px, 5.8vw, 84px); line-height: 1.08; letter-spacing: -.02em; }
h2 { font-size: clamp(30px, 3.4vw, 48px); line-height: 1.15; letter-spacing: -.015em; }
h3 { font-size: 21px; line-height: 1.3; letter-spacing: -.005em; }
.muted { color: var(--muted); }
.lead { font-size: clamp(18px, 1.5vw, 21px); line-height: 1.6; max-width: 32em; }
.more { display: inline-flex; align-items: center; min-height: 44px; color: var(--ink); font-size: 16px; font-weight: 700; text-decoration: underline; text-decoration-color: var(--red); text-decoration-thickness: 2px; text-underline-offset: 6px; }
.more:hover { color: var(--red); }
.skip-link { position: absolute; left: var(--gutter); top: -60px; z-index: 20; background: #fff; border-radius: var(--radius); padding: 10px 16px; font-weight: 700; }
.skip-link:focus { top: 8px; }

.utility { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 2px 20px; background: var(--deep); color: #fff; padding: 8px var(--gutter); font-size: 14px; }
.utility div { display: flex; flex-wrap: wrap; gap: 2px 24px; }
.nav { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 28px; padding: 12px var(--gutter); background: #fff; font-size: 16px; font-weight: 500; }
.logo { display: flex; align-items: center; gap: 10px; margin-right: auto; }
.logo img { display: block; height: 44px; width: auto; filter: grayscale(1) brightness(.75) contrast(3); }
.logo-en { font-size: 25px; font-weight: 700; line-height: 1; letter-spacing: -.01em; }
.menu { display: flex; flex-wrap: wrap; gap: 0 26px; }
.menu a, .langs a { display: inline-flex; align-items: center; min-height: 44px; }
.menu a { position: relative; }
.menu a[aria-current="page"] { font-weight: 700; box-shadow: inset 0 -2px 0 var(--red); }
.menu a:hover { color: var(--red); }
.langs { display: flex; gap: 10px; color: var(--muted); font-size: 14px; }
.langs a { justify-content: center; min-width: 32px; }
.langs a[aria-current="true"] { color: var(--ink); font-weight: 700; }

.btn { display: inline-flex; align-items: center; justify-content: center; min-height: 50px; border: 1.5px solid transparent; border-radius: var(--radius); padding: 11px 28px; font: inherit; font-size: 16px; font-weight: 700; cursor: pointer; }
.btn.small { min-height: 42px; padding: 7px 18px; font-size: 15px; background: var(--ink); color: #fff; }
.btn.small:hover { background: var(--red); }
.primary { background: var(--red); color: #fff; }
.primary:hover { background: var(--red-hover); transform: translateY(-1px); }
.line { border-color: var(--ink); color: var(--ink); }
.line:hover { background: var(--ink); color: #fff; }

.hero { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: flex-end; gap: 28px 56px; border-top: 2px solid var(--ink); padding: clamp(36px, 4.4vw, 64px) var(--gutter) clamp(36px, 4vw, 56px); }
.hero h1 { font-size: clamp(54px, 9.2vw, 132px); line-height: 1.02; font-weight: 700; letter-spacing: -.025em; }
.hero h1:lang(id), .hero h1:lang(en) { font-size: clamp(44px, 7vw, 100px); line-height: 1.04; }
.hero-side { flex: 0 1 390px; display: flex; flex-direction: column; align-items: flex-start; gap: 18px; }
.hero-side .lead { font-size: 18px; }
.actions { display: flex; flex-wrap: wrap; gap: 10px; }
.actions .btn { padding-inline: 22px; }

.series-list { border-bottom: 1px solid var(--ink); }
.series-row { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr) minmax(0, 1fr); align-items: center; gap: 24px 32px; min-height: 196px; padding: 8px var(--gutter); border-top: 1px solid var(--ink); }
.code { font-size: clamp(64px, 10.4vw, 148px); font-weight: 700; line-height: 1; letter-spacing: -.035em; transition: color .15s ease; }
.series-row:hover .code { color: var(--red); }
.series-row .pic { aspect-ratio: 4 / 3; width: min(100%, 250px); justify-self: center; display: flex; align-items: center; }
.series-row .pic img { display: block; width: 100%; height: 100%; object-fit: contain; mix-blend-mode: multiply; }
.series-row:hover .pic img { animation: motor-settle .55s linear 1; }
.series-info { display: flex; flex-direction: column; gap: 2px; font-size: 18px; line-height: 1.5; }
.series-info .muted { font-size: 15px; }
.tag { color: var(--red); font-size: 14px; font-weight: 700; }
@keyframes motor-settle {
  0%, 100% { transform: translate(0, 0); }
  14% { transform: translate(-2px, 1px); }
  30% { transform: translate(2px, -1px); }
  48% { transform: translate(-2px, 0); }
  66% { transform: translate(1px, 1px); }
  84% { transform: translate(-1px, 0); }
}

.section { padding: var(--space) var(--gutter); display: flex; flex-direction: column; gap: 40px; scroll-margin-top: 12px; }
.ground { background: var(--ground); }
.head { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: flex-end; gap: 8px 24px; }
.head .muted { margin-top: 10px; }
.split-section { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 2fr); gap: 32px 64px; align-items: start; }

.paths { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 32px; border-top: 2px solid var(--ink); padding-top: 22px; }
.path { display: flex; flex-direction: column; align-items: flex-start; gap: 8px; }
.path h3 { font-size: 24px; }
.path p { color: var(--muted); font-size: 16px; }
.path-link { display: inline-flex; align-items: center; gap: 10px; min-height: 44px; font-size: 15px; font-weight: 700; }
.arrow { width: 20px; height: 20px; flex: none; transition: transform .2s ease; }
.path:hover h3, .path:hover .path-link { color: var(--red); }
.path:hover .arrow { transform: translateX(4px); }

.about { display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr); background: var(--ink); color: #fff; }
.about h2 { color: #fff; }
.about-photo { position: relative; min-height: 460px; }
.about-photo img { display: block; position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.about-text { display: flex; flex-direction: column; align-items: flex-start; justify-content: center; gap: 16px; padding: var(--space) var(--gutter); }
.about-solo { grid-template-columns: minmax(0, 1fr) minmax(0, 2fr); gap: 32px 64px; align-items: start; padding: var(--space) var(--gutter); }
.about-solo .about-text { padding: 0; }
.about .more { color: #fff; }
.about .more:hover { color: var(--muted-dark); }
.about .muted { color: var(--muted-dark); }

.rows { border-top: 2px solid var(--ink); }
.row { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.5fr); gap: 8px 28px; padding: 22px 0; border-bottom: 1px solid var(--line); }
.row p { color: var(--muted); font-size: 16px; }

.steps-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 32px; padding: 0; list-style: none; counter-reset: step; border-top: 2px solid var(--ink); }
.steps-list li { counter-increment: step; padding-top: 18px; }
.steps-list li::before { content: counter(step); display: block; color: var(--red); font-size: 40px; font-weight: 700; line-height: 1; margin-bottom: 14px; font-variant-numeric: tabular-nums; }
.steps-list p { color: var(--muted); font-size: 16px; margin-top: 6px; }

.page-head { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr); gap: 16px 64px; align-items: end; background: var(--ground); padding: clamp(56px, 7vw, 104px) var(--gutter) clamp(40px, 5vw, 64px); }
.subnav { grid-column: 2; display: flex; flex-wrap: wrap; gap: 0 24px; }
.notice { border-left: 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 16px 0; }
.notes { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(260px, 100%), 1fr)); gap: 12px 24px; }
.notes p { color: var(--muted); font-size: 16px; margin-top: 4px; }
.four { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 32px; border-top: 2px solid var(--ink); padding-top: 22px; }
.four p { color: var(--muted); font-size: 16px; margin-top: 6px; }
.three { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 32px; border-top: 2px solid var(--ink); padding-top: 22px; }
.part p { margin-top: 6px; font-size: 16px; }
.process h3 { font-size: 22px; }
.real-photo { display: block; width: 100%; aspect-ratio: 4 / 3; object-fit: cover; border-radius: var(--radius); margin-bottom: 12px; }
.factory-video { display: block; width: 100%; max-height: 560px; background: #000; }
.filters { display: flex; flex-wrap: wrap; gap: 8px; }
.filter { min-height: 44px; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; color: var(--ink); padding: 7px 16px; font: inherit; font-size: 15px; font-weight: 500; cursor: pointer; }
.filter[aria-pressed="true"] { background: var(--ink); border-color: var(--ink); color: #fff; }
.table-wrap { overflow-x: auto; border-top: 2px solid var(--ink); }
table { width: 100%; min-width: 760px; border-collapse: collapse; font-size: 16px; text-align: left; font-variant-numeric: tabular-nums; }
th { padding: 12px 14px 12px 0; font-size: 14px; font-weight: 700; }
td { padding: 12px 14px 12px 0; border-top: 1px solid var(--line); }
.flow { display: flex; flex-direction: column; gap: 12px; }
.flow ol { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px 24px; padding: 0; list-style: none; counter-reset: step; }
.flow li { display: flex; gap: 8px; counter-increment: step; }
.flow li::before { content: counter(step); color: var(--red); font-weight: 700; }

.data { width: 100%; }
.data > div { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 3fr); gap: 16px; padding: 12px 0; border-top: 1px solid var(--line); }
.data > div:last-child { border-bottom: 1px solid var(--line); }
.data dt { color: var(--muted); }
.about .data > div { border-color: var(--line-dark); }
.about .data dt { color: var(--muted-dark); }
.docs { margin-top: 12px; }

.contact { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 48px 64px; align-items: start; background: var(--ground); padding: clamp(56px, 7vw, 104px) var(--gutter); }
.contact-info { display: flex; flex-direction: column; align-items: flex-start; gap: 18px; }
.contact .notice { width: 100%; }
.wa-link { align-self: flex-start; }
form { display: flex; flex-direction: column; gap: 14px; background: #fff; padding: clamp(18px, 3vw, 30px); }
form .btn { align-self: flex-start; }
.field { display: flex; flex-direction: column; gap: 4px; font-size: 15px; font-weight: 500; }
input, select, textarea { width: 100%; min-height: 44px; border: 1px solid #a9afb5; border-radius: var(--radius); background: #fff; color: var(--ink); padding: 10px 12px; font: inherit; font-weight: 400; }
.form-note { color: var(--red); font-size: 15px; }

.band { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 20px 32px; background: var(--ink); color: #fff; padding: clamp(48px, 6vw, 88px) var(--gutter); }
.band h2 { color: #fff; max-width: 18em; }
.band p { color: var(--muted-dark); margin-top: 10px; }
.footer { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px 28px; background: var(--deep); color: var(--muted-dark); padding: 28px var(--gutter); font-size: 15px; }
.footer strong { display: block; color: #fff; font-weight: 700; }
.footer span { display: block; }

.float-wa { display: none; }
@media (max-width: 1000px) {
  .four, .flow ol { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .split-section, .about-solo { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 720px) {
  .about, .paths, .three, .four, .contact, .steps-list, .page-head { grid-template-columns: minmax(0, 1fr); }
  .hero-side { flex: 1 1 100%; }
  .series-row { grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); min-height: 0; padding-block: 16px; gap: 8px 12px; }
  .code { font-size: clamp(50px, 16vw, 72px); }
  .series-info { grid-column: 1 / -1; font-size: 16px; }
  .row { grid-template-columns: minmax(0, 1fr); }
  .subnav { grid-column: auto; }
  .flow ol { grid-template-columns: minmax(0, 1fr); }
  .data > div { grid-template-columns: minmax(0, 1fr); gap: 2px; }
  .nav .btn.small { display: none; }
  .langs a { min-width: 44px; }
  .float-wa { display: block; position: fixed; right: 16px; bottom: calc(16px + env(safe-area-inset-bottom, 0px)); z-index: 10; background: var(--red); color: #fff; border-radius: var(--radius); padding: 12px 18px; font-weight: 700; }
  .footer { padding-bottom: 84px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  a, button, .arrow { transition: none; }
  .series-row:hover .pic img { animation: none; }
  .primary:hover { transform: none; }
  .path:hover .arrow { transform: none; }
}