/* roulang page: index */
:root {
  --bg: #F3F6FB;
  --card: #FFFFFF;
  --ink: #1A2740;
  --muted: #5C6B82;
  --blue: #2B6CB0;
  --blue-d: #1E4E86;
  --line: #E3EAF3;
  --teal: #0E8F7B;
  --teal-bg: #E5F5F2;
  --ochre: #C47B2B;
  --dark: #122033;
  --shadow: 0 10px 30px rgba(30,78,134,.08);
  --shadow-h: 0 16px 36px rgba(30,78,134,.12);
  --radius: 18px;
  --container: 1120px;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "PingFang SC", "HarmonyOS Sans SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  font-size: 17px;
  line-height: 1.75;
  color: var(--ink);
  background: var(--bg);
}
body.has-convert { padding-bottom: 92px; }
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button, input, select { font: inherit; color: inherit; }
button { cursor: pointer; }
h1, h2, h3, p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
dl, dd { margin: 0; }
:focus { outline: none; }
:focus-visible { outline: 2px solid var(--blue); outline-offset: 2px; }
::selection { background: #D6E6F7; color: var(--ink); }
.container { width: min(var(--container), calc(100% - 40px)); margin: 0 auto; }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
.site-header { position: sticky; top: 0; z-index: 50; background: #fff; }
.site-header.is-compact { box-shadow: 0 8px 24px rgba(30,78,134,.08); }
.site-header.is-compact .trust-bar { display: none; }
.trust-bar { background: #E8F0FA; border-bottom: 1px solid var(--line); }
.trust-inner { min-height: 44px; display: flex; align-items: center; justify-content: space-between; gap: 16px; font-size: 14px; color: var(--muted); }
.trust-inner a { color: var(--blue); min-height: 44px; display: inline-flex; align-items: center; font-weight: 700; }
.trust-inner a:hover { color: var(--blue-d); }
.header-inner { min-height: 76px; display: flex; align-items: center; gap: 12px; }
.logo { display: flex; align-items: center; gap: 10px; min-height: 44px; color: var(--blue); }
.logo-mark { width: 64px; height: 40px; flex: none; }
.logo-text { display: flex; flex-direction: column; line-height: 1.15; }
.logo-text strong { color: var(--ink); font-size: 18px; font-weight: 700; }
.logo-text small { color: var(--muted); font-size: 12px; }
.header-tools { display: none; margin-left: auto; gap: 8px; }
.nav-phone, .nav-toggle {
  width: 44px; height: 44px; display: inline-flex; align-items: center; justify-content: center;
  border-radius: 12px; border: 1px solid var(--line); background: #fff; color: var(--ink);
}
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after {
  display: block; width: 18px; height: 2px; background: var(--ink); position: relative; border-radius: 2px;
}
.nav-toggle span::before, .nav-toggle span::after { content: ""; position: absolute; left: 0; }
.nav-toggle span::before { top: -6px; }
.nav-toggle span::after { top: 6px; }
.nav-panel { margin-left: auto; display: flex; align-items: center; gap: 8px; }
.nav-list { display: flex; align-items: center; }
.nav-list a {
  min-height: 44px; padding: 0 10px; display: inline-flex; align-items: center;
  font-size: 15px; color: var(--ink); white-space: nowrap;
}
.nav-list a:hover { color: var(--blue); }
.nav-list a[aria-current="true"] { color: var(--blue); box-shadow: inset 0 -2px 0 var(--blue); }
.btn {
  min-height: 48px; padding: 0 18px; border-radius: 14px; border: 1px solid transparent;
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-size: 16px; font-weight: 700; transition: background .2s ease, color .2s ease, box-shadow .2s ease;
}
.btn:active { transform: translateY(1px); box-shadow: inset 0 2px 8px rgba(18,32,51,.2); }
.btn:disabled, .btn.is-disabled { background: #D5DEEA; color: #8A97AB; border-color: #D5DEEA; box-shadow: none; cursor: not-allowed; }
.btn-solid { background: var(--blue); color: #fff; }
.btn-solid:hover { background: var(--blue-d); color: #fff; }
.btn-line { background: #fff; color: var(--blue); border-color: var(--blue); }
.btn-line:hover { background: var(--blue-d); color: #fff; }
.nav-cta { min-height: 44px; white-space: nowrap; }
.hero { position: relative; scroll-margin-top: 100px; }
.hero-stage { position: relative; min-height: 760px; }
.slides { position: absolute; inset: 0; background: #D9E3F0; }
.slide { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; opacity: 0; transition: opacity .45s ease; }
.slide.is-active { opacity: 1; }
.hero-grid { position: relative; z-index: 2; min-height: 760px; display: flex; align-items: center; padding: 104px 0; }
.hero-card { width: min(560px, 100%); background: #fff; border-radius: var(--radius); box-shadow: var(--shadow); padding: 32px; }
.brand-line { color: var(--blue); font-weight: 700; font-size: 15px; margin-bottom: 10px; }
h1 { font-size: 46px; line-height: 1.28; font-weight: 700; }
.hero-lead { margin-top: 16px; color: var(--muted); font-size: 16px; }
.frame-copy { display: none; margin-top: 18px; }
.frame-copy.is-active { display: block; }
.frame-copy h2 { font-size: 28px; line-height: 1.4; }
.frame-copy p { margin-top: 8px; color: var(--ink); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 18px; }
.badge { display: inline-flex; align-items: center; min-height: 28px; padding: 2px 10px; border-radius: 999px; background: var(--teal-bg); color: var(--teal); font-size: 13px; font-weight: 700; }
.badge-blue { background: #E7F0FA; color: var(--blue); }
.hero-card .badge { margin-bottom: 12px; }
.hero-ui {
  position: absolute; z-index: 3; left: 50%; bottom: 28px; transform: translateX(-50%);
  display: flex; align-items: center; gap: 4px; background: #fff; border-radius: 999px;
  padding: 4px; box-shadow: var(--shadow);
}
.icon-btn, .dot, .pause-btn {
  min-width: 44px; min-height: 44px; border: 0; background: transparent; color: var(--ink);
  border-radius: 999px; display: inline-flex; align-items: center; justify-content: center;
}
.icon-btn:hover, .pause-btn:hover, .dot:hover { background: #E7F0FA; }
.pause-btn { padding: 0 14px; font-size: 14px; font-weight: 700; color: var(--blue); }
.dot i { width: 8px; height: 8px; border-radius: 99px; background: #C5D3E4; display: block; }
.dot.is-active i { width: 22px; background: var(--blue); }
.block { padding: 104px 0; scroll-margin-top: 100px; }
.is-white { background: #fff; }
.is-soft { background: #E7EEF7; }
.is-dark { background: var(--dark); color: #F3F6FB; }
.section-head { max-width: 760px; margin-bottom: 28px; }
h2 { font-size: 32px; line-height: 1.35; font-weight: 700; }
h3 { font-size: 20px; line-height: 1.45; font-weight: 700; }
.lead { margin-top: 12px; color: var(--muted); }
.is-dark .lead { color: #C5D0E0; }
.rail { display: flex; }
.rail-item { flex: 1; position: relative; padding: 0 28px 0 0; }
.rail-item::before { content: ""; position: absolute; left: 27px; right: 0; top: 26px; height: 2px; background: #C9D8EA; }
.rail-item:last-child::before { display: none; }
.rail-index {
  width: 54px; height: 54px; border-radius: 50%; border: 2px solid var(--blue); background: #fff;
  color: var(--blue); display: grid; place-items: center; font-weight: 700; position: relative; z-index: 1;
}
.rail-item h3 { margin-top: 14px; }
.rail-num { display: block; margin: 6px 0; font-size: 34px; line-height: 1.1; color: var(--blue); }
.rail-item p { color: var(--muted); font-size: 15px; }
.split, .sheet-layout, .deliver-grid, .reserve-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 36px; align-items: center; }
.sheet-layout { grid-template-columns: 1.55fr .75fr; align-items: start; }
.copy p + p { margin-top: 14px; }
.photo-frame { border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); background: #fff; }
.photo-frame img { width: 100%; height: 100%; object-fit: cover; aspect-ratio: 4/3; }
.rule-list { margin-top: 18px; display: grid; gap: 10px; }
.rule-list li { background: #fff; border: 1px solid var(--line); border-radius: 14px; padding: 12px 14px; }
.rule-list strong { color: var(--blue); }
.scene-list { display: grid; gap: 22px; }
.scene { display: grid; grid-template-columns: 1.45fr .8fr; background: #fff; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
.scene:nth-child(even) { grid-template-columns: .8fr 1.45fr; }
.scene:nth-child(even) .scene-photo { order: 2; }
.scene-photo img { width: 100%; height: 100%; object-fit: cover; min-height: 230px; aspect-ratio: 16/8; }
.scene-copy { padding: 28px 24px; }
.scene-copy span { color: var(--teal); font-weight: 700; font-size: 14px; }
.scene-copy ul { margin-top: 12px; display: grid; gap: 6px; color: var(--muted); }
.scene:nth-child(1) { width: 94%; }
.scene:nth-child(2) { width: 90%; margin-left: auto; }
.scene:nth-child(3) { width: 84%; }
.sheet, .cmp { width: 100%; border-collapse: separate; border-spacing: 0; background: #fff; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
.sheet th, .sheet td, .cmp th, .cmp td { padding: 14px 12px; text-align: left; vertical-align: top; border-bottom: 1px solid var(--line); font-size: 15px; font-weight: 500; }
.sheet thead th, .cmp thead th { background: #E7F0FA; font-weight: 700; }
.sheet tbody th { font-weight: 700; }
.side-note { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 22px 20px; }
.side-note li { padding: 12px 0; border-top: 1px solid var(--line); font-size: 15px; }
.side-note li:first-of-type { border-top: 0; }
.bento { display: grid; grid-template-columns: repeat(4, 1fr); grid-auto-rows: minmax(150px, auto); gap: 16px; }
.bento article { background: #fff; border-radius: var(--radius); box-shadow: var(--shadow); border: 1px solid var(--line); padding: 22px; min-width: 0; transition: box-shadow .2s ease; }
.bento article:hover, .spec-card:hover, .note-card:hover, .story:hover, .voice:hover { box-shadow: var(--shadow-h); }
.bento-a { grid-column: 1 / 3; grid-row: 1 / 3; background: #E7F0FA; }
.bento-b { grid-column: 3 / 5; grid-row: 1 / 2; }
.bento-c { grid-column: 3 / 4; grid-row: 2 / 3; }
.bento-d { grid-column: 4 / 5; grid-row: 2 / 3; }
.bento-e { grid-column: 1 / 3; grid-row: 3 / 4; }
.bento-f { grid-column: 3 / 5; grid-row: 3 / 4; }
.bento p, .card-text { margin-top: 8px; color: var(--muted); font-size: 15px; }
.kicker { color: var(--blue); font-size: 13px; font-weight: 700; }
.stock-grid, .note-grid { display: grid; gap: 18px; }
.stock-grid { grid-template-columns: repeat(3, 1fr); }
.note-grid { grid-template-columns: 1.35fr .9fr .9fr; align-items: stretch; }
.spec-card, .note-card { background: #fff; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); border: 1px solid var(--line); color: inherit; display: flex; flex-direction: column; transition: box-shadow .2s ease; }
.spec-card img, .note-card img { width: 100%; aspect-ratio: 16/10; object-fit: cover; }
.note-card:first-child img { aspect-ratio: 16/9; }
.card-body { padding: 18px 18px 20px; display: flex; flex-direction: column; gap: 10px; flex: 1; }
.spec-card dl { display: grid; grid-template-columns: 1fr 1fr; gap: 8px 12px; }
.spec-card dt { color: var(--muted); font-size: 13px; }
.spec-card dd { font-size: 15px; }
.price { color: var(--ochre); font-size: 22px; font-weight: 700; line-height: 1.3; }
.card-actions { margin-top: auto; }
.story { display: grid; grid-template-columns: 300px 1fr; background: #fff; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); margin-top: 18px; transition: box-shadow .2s ease; }
.story img { width: 100%; height: 100%; object-fit: cover; min-height: 220px; }
.story div { padding: 26px 24px; }
.story p { margin-top: 10px; color: var(--muted); }
.stat-bar { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.stat { background: #fff; border-radius: var(--radius); box-shadow: var(--shadow); padding: 22px 18px; }
.stat b { display: block; font-size: 40px; line-height: 1.1; color: var(--blue); }
.stat span { display: block; margin-top: 8px; color: var(--muted); font-size: 15px; }
.voice-grid { display: grid; grid-template-columns: 1.15fr .85fr .95fr; gap: 18px; align-items: start; }
.voice { background: #fff; border-radius: var(--radius); box-shadow: var(--shadow); padding: 22px; border: 1px solid var(--line); transition: box-shadow .2s ease; }
.voice:nth-child(2) { margin-top: 52px; }
.voice:nth-child(3) { margin-top: 18px; }
.voice p { font-size: 16px; }
.voice footer { margin-top: 16px; color: var(--muted); font-size: 14px; }
.deliver-grid { align-items: center; }
.steps { display: grid; gap: 14px; }
.steps li { display: grid; grid-template-columns: 52px 1fr; gap: 12px; }
.steps b { width: 52px; height: 52px; border-radius: 16px; display: grid; place-items: center; background: #1E4E86; color: #fff; }
.steps p { color: #C5D0E0; font-size: 15px; }
.deliver-photo { border-radius: var(--radius); overflow: hidden; }
.deliver-photo img { width: 100%; height: 100%; object-fit: cover; aspect-ratio: 16/10; }
.more { color: var(--blue); font-weight: 700; }
.note-card:hover .more { color: var(--blue-d); }
.faq { background: #fff; border-radius: var(--radius); box-shadow: var(--shadow); padding: 8px 22px; }
.faq-q {
  width: 100%; min-height: 56px; padding: 12px 0; border: 0; border-bottom: 1px solid var(--line);
  background: transparent; display: flex; align-items: center; justify-content: space-between; gap: 16px;
  text-align: left; font-weight: 700; font-size: 17px;
}
.mark { width: 22px; height: 22px; border-radius: 50%; border: 1px solid var(--line); position: relative; flex: none; }
.mark::before, .mark::after { content: ""; position: absolute; background: var(--blue); left: 50%; top: 50%; transform: translate(-50%, -50%); }
.mark::before { width: 12px; height: 2px; }
.mark::after { width: 2px; height: 12px; }
.faq-item.is-open .mark::after { display: none; }
.faq-a { display: none; padding: 4px 0 16px; color: var(--muted); }
.faq-item.is-open .faq-a { display: block; }
.seal-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.seal { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 16px; display: flex; gap: 10px; }
.seal i { width: 10px; height: 10px; border-radius: 50%; background: var(--teal); margin-top: 8px; flex: none; }
.seal b { display: block; font-size: 16px; }
.seal span { display: block; color: var(--muted); font-size: 14px; margin-top: 4px; }
.form-card, .success-box { background: #fff; border-radius: var(--radius); box-shadow: var(--shadow); padding: 22px; border: 1px solid var(--line); }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field.full { grid-column: 1 / -1; }
.field span { font-size: 14px; font-weight: 700; }
.field input, .field select {
  min-height: 48px; border: 1px solid var(--line); border-radius: 12px; padding: 0 14px; background: #fff; width: 100%;
}
.field select {
  appearance: none;
  background-image: linear-gradient(45deg, transparent 50%, #2B6CB0 50%), linear-gradient(135deg, #2B6CB0 50%, transparent 50%);
  background-position: calc(100% - 18px) 22px, calc(100% - 12px) 22px;
  background-size: 6px 6px, 6px 6px;
  background-repeat: no-repeat;
}
.field input:focus, .field select:focus { border-color: var(--blue); }
.err { color: #8C4E16; font-size: 13px; line-height: 1.5; }
.form-alert { color: #8C4E16; margin-bottom: 12px; }
.form-card .btn { margin-top: 16px; width: 100%; }
.success-box strong { display: block; font-size: 22px; margin-bottom: 8px; }
.call-line { display: inline-flex; margin-top: 14px; color: var(--blue); font-weight: 700; min-height: 44px; align-items: center; }
.convert-bar {
  position: fixed; z-index: 60; left: 50%; bottom: calc(12px + env(safe-area-inset-bottom));
  width: min(1120px, calc(100% - 24px)); transform: translate(-50%, 150%);
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow);
  transition: transform .25s ease;
}
.convert-bar.is-on { transform: translate(-50%, 0); }
.convert-inner { min-height: 64px; display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 8px 14px; }
.convert-inner p { font-weight: 700; }
.convert-actions { display: flex; align-items: center; gap: 10px; }
.convert-actions a:first-child { color: var(--blue); font-weight: 700; min-height: 44px; display: inline-flex; align-items: center; }
.footer { background: #fff; border-top: 1px solid var(--line); padding: 36px 0 28px; }
.foot-grid { display: grid; grid-template-columns: 1.2fr 1fr .9fr; gap: 24px; }
.foot-links { display: grid; gap: 4px; }
.foot-links a { min-height: 36px; display: inline-flex; align-items: center; color: var(--muted); }
.foot-links a:hover, .footer a:hover { color: var(--blue-d); }
.foot-meta { color: var(--muted); font-size: 14px; }
.foot-meta a { color: var(--blue); overflow-wrap: anywhere; }
.copyline { margin-top: 22px; padding-top: 16px; border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; overflow-wrap: anywhere; }
@media (max-width: 1279px) {
  h1 { font-size: 42px; }
}
@media (min-width: 1280px) {
  h1 { font-size: 52px; }
}
@media (max-width: 1024px) {
  .nav-panel { display: none; position: absolute; left: 0; right: 0; top: 100%; margin-left: 0; background: #fff; border-top: 1px solid var(--line); box-shadow: var(--shadow); padding: 8px 16px 16px; flex-direction: column; align-items: stretch; z-index: 5; }
  .nav-panel.is-open { display: flex; max-height: calc(100vh - 72px); overflow: auto; }
  .nav-list { flex-direction: column; align-items: stretch; }
  .nav-list a, .nav-cta { width: 100%; }
  .header-tools { display: flex; }
  .scene, .scene:nth-child(even) { grid-template-columns: 1fr; width: auto; margin-left: 0; }
  .scene:nth-child(even) .scene-photo { order: 0; }
  .bento { grid-template-columns: 1fr 1fr; }
  .bento-a, .bento-b, .bento-c, .bento-d, .bento-e, .bento-f { grid-column: auto; grid-row: auto; }
  .bento-a, .bento-b { grid-column: 1 / -1; }
  .stock-grid, .note-grid { grid-template-columns: 1fr 1fr; }
  .note-card:first-child { grid-column: 1 / -1; }
  .voice-grid, .split, .sheet-layout, .deliver-grid, .reserve-grid, .seal-row { grid-template-columns: 1fr 1fr; }
  .voice { margin-top: 0; }
  .foot-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  body { font-size: 16px; }
  h1 { font-size: 34px; }
  h2 { font-size: 28px; }
  .container { width: min(var(--container), calc(100% - 32px)); }
  .block { padding: 64px 0; }
  .hero-stage, .hero-grid { min-height: 0; }
  .slides { position: relative; height: 230px; }
  .slide { height: 230px; }
  .hero-grid { padding: 22px 0 8px; }
  .hero-card { padding: 22px; }
  .hero-ui { position: static; transform: none; width: max-content; max-width: calc(100% - 32px); margin: 0 auto 8px; }
  .rail { flex-direction: column; gap: 18px; border-left: 2px solid #C9D8EA; margin-left: 26px; }
  .rail-item { padding: 0 0 0 22px; }
  .rail-item::before { display: none; }
  .rail-index { position: absolute; left: -28px; top: 0; }
  .split, .sheet-layout, .deliver-grid, .reserve-grid, .voice-grid, .seal-row, .stock-grid, .note-grid, .form-grid, .foot-grid { grid-template-columns: 1fr; }
  .note-card:first-child { grid-column: auto; }
  .story { grid-template-columns: 1fr; }
  .stat-bar { grid-template-columns: 1fr 1fr; }
  .scene:nth-child(n) { width: auto; margin: 0; }
  .sheet thead, .cmp thead { display: none; }
  .sheet, .sheet tbody, .sheet tr, .sheet th, .sheet td, .cmp, .cmp tbody, .cmp tr, .cmp th, .cmp td { display: block; width: 100%; }
  .sheet tr, .cmp tr { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); margin-bottom: 14px; padding: 8px 14px 12px; box-shadow: var(--shadow); }
  .sheet th[scope="row"], .cmp th[scope="row"] { font-size: 18px; border-bottom: 0; padding-bottom: 4px; }
  .sheet td, .cmp td { display: block; border-bottom: 1px solid var(--line); padding: 10px 0; }
  .sheet td::before, .cmp td::before { content: attr(data-label); display: block; color: var(--muted); font-size: 13px; }
  .convert-inner { align-items: flex-start; flex-direction: column; padding: 10px 12px; }
  .trust-inner { font-size: 13px; }
}
@media (max-width: 520px) {
  .bento, .stat-bar { grid-template-columns: 1fr; }
  .spec-card dl { grid-template-columns: 1fr; }
  .hero-actions, .hero-actions .btn, .convert-actions { width: 100%; }
  .convert-actions { flex-direction: column; align-items: stretch; }
}
@media (max-width: 375px) {
  .container { width: calc(100% - 28px); }
  h1 { font-size: 32px; }
  .logo-text small { max-width: 132px; }
  .stat b { font-size: 34px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}