:root {
  --ink: oklch(14% .025 219);
  --sea: oklch(48% .095 207);
  --aqua: oklch(90% .10 185);
  --paper: oklch(96% .008 92);
  --mist: oklch(91% .012 210);
  --line: oklch(20% .025 219 / .16);
  --muted: oklch(47% .025 220);
  --snow: oklch(97% .006 210);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font: 16px/1.62 Onest, "Segoe UI", sans-serif; font-kerning: normal; }
a { color: inherit; text-decoration: none; }
a:hover { color: var(--sea); }
:focus-visible { outline: 2px solid var(--aqua); outline-offset: 4px; }
.shell { width: min(1180px, calc(100% - 48px)); margin: auto; }
.eyebrow { margin: 0 0 15px; color: var(--aqua); font-size: 11px; font-weight: 800; letter-spacing: .14em; text-transform: uppercase; }
h1, h2, h3, .step__number, .guide-table td:first-child { font-family: "Sofia Sans Condensed", "Arial Narrow", sans-serif; }

.topline { position: relative; z-index: 2; display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 24px 0; color: oklch(92% .012 210); font-size: 12px; font-weight: 700; letter-spacing: .07em; text-transform: uppercase; }
.brand { color: var(--snow); font-size: 17px; font-weight: 800; letter-spacing: .13em; }
.topline nav { display: flex; align-items: center; gap: 20px; }
.topline [aria-current="page"] { color: var(--aqua); }
.phone { white-space: nowrap; }

.guide-hero { position: relative; min-height: 590px; overflow: hidden; color: var(--snow); background: linear-gradient(92deg, oklch(13% .028 219 / .96), oklch(13% .028 219 / .58)), url("hangkai-waterline-v1.png") center / cover; }
.guide-hero::after { position: absolute; inset: 0; content: ""; background: linear-gradient(0deg, oklch(13% .028 219 / .74), transparent 58%); pointer-events: none; }
.guide-hero__body { position: relative; z-index: 1; max-width: 830px; padding: clamp(74px, 12vh, 134px) 0 78px; }
h1 { max-width: 820px; margin: 0; font-size: clamp(52px, 7.5vw, 104px); line-height: .9; letter-spacing: -.032em; text-transform: uppercase; }
.guide-hero__lead { max-width: 650px; margin: 28px 0 0; color: oklch(88% .018 210); font-size: clamp(17px, 2vw, 21px); line-height: 1.55; }
.hero-links { display: flex; flex-wrap: wrap; gap: 12px 22px; margin: 33px 0 0; color: var(--aqua); font-size: 12px; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
.hero-links a { text-decoration: underline; text-decoration-color: oklch(90% .10 185 / .35); text-underline-offset: 4px; }

.breadcrumb { display: flex; flex-wrap: wrap; gap: 8px; padding: 21px 0 0; color: oklch(71% .026 210); font-size: 11px; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; }
.breadcrumb span { color: var(--muted); }
.introduction { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(290px, .8fr); gap: clamp(32px, 8vw, 116px); padding: clamp(72px, 10vw, 124px) 0; }
.introduction h2, .section-head h2, .dark-callout h2 { margin: 0; font-size: clamp(38px, 5vw, 70px); line-height: .93; letter-spacing: -.037em; text-transform: uppercase; }
.intro-copy { max-width: 540px; color: var(--muted); }
.intro-copy p { margin: 0 0 19px; }
.intro-copy strong { color: var(--sea); }
.passport-note { align-self: end; padding: 26px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.passport-note b { display: block; margin-bottom: 7px; font-size: 12px; letter-spacing: .09em; text-transform: uppercase; }
.passport-note p { max-width: 390px; margin: 0; color: var(--muted); font-size: 14px; }

.steps { padding: clamp(74px, 9vw, 114px) 0; color: var(--snow); background: var(--ink); }
.section-head { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(280px, .75fr); gap: 44px; align-items: end; margin-bottom: 42px; }
.section-head p { max-width: 500px; margin: 0; color: oklch(76% .025 210); }
.step-list { border-top: 1px solid oklch(94% .01 210 / .25); }
.step { display: grid; grid-template-columns: 94px minmax(0, 1fr) minmax(250px, .65fr); gap: 30px; align-items: start; padding: 31px 0 34px; border-bottom: 1px solid oklch(94% .01 210 / .18); }
.step__number { color: var(--aqua); font-size: 35px; line-height: .8; }
.step h3 { margin: 0; font-size: clamp(27px, 3vw, 40px); line-height: .95; letter-spacing: -.022em; text-transform: uppercase; }
.step p { max-width: 480px; margin: 0; color: oklch(77% .025 210); }
.step__rule { color: oklch(91% .012 210); font-size: 14px; line-height: 1.55; }

.check-area { padding: clamp(76px, 10vw, 122px) 0; }
.check-layout { display: grid; grid-template-columns: minmax(0, 1fr) minmax(300px, .74fr); gap: clamp(34px, 8vw, 112px); }
.check-layout h2 { margin: 0; font-size: clamp(38px, 5vw, 68px); line-height: .94; letter-spacing: -.036em; text-transform: uppercase; }
.check-layout > p { max-width: 570px; margin: 21px 0 0; color: var(--muted); }
.checklist { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.checklist li { display: grid; grid-template-columns: 28px minmax(0, 1fr); gap: 13px; padding: 17px 0; border-bottom: 1px solid var(--line); }
.checklist li::before { content: "0" counter(list-item); color: var(--sea); font-size: 11px; font-weight: 800; letter-spacing: .07em; }
.checklist b { display: block; margin-bottom: 3px; font-size: 15px; }
.checklist span { color: var(--muted); font-size: 14px; }

.dark-callout { padding: clamp(34px, 5vw, 62px); color: var(--snow); background: linear-gradient(112deg, oklch(17% .03 219), oklch(25% .04 211)); }
.dark-callout__grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(270px, .72fr); gap: clamp(28px, 6vw, 86px); align-items: end; }
.dark-callout p { max-width: 500px; margin: 0; color: oklch(84% .025 210); }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 46px; padding: 13px 17px; border: 1px solid currentColor; color: var(--snow); font-size: 12px; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; transition: background .22s ease, color .22s ease; }
.button:hover { color: var(--ink); background: var(--snow); }
.button + .button { margin-left: 10px; }
.button--plain { color: var(--sea); }
.button--plain:hover { color: var(--snow); background: var(--sea); }

.guide-table-wrap { overflow-x: auto; margin-top: 46px; border-top: 1px solid var(--line); }
.guide-table { width: 100%; min-width: 620px; border-collapse: collapse; text-align: left; }
.guide-table th { padding: 16px 18px; color: var(--muted); font-size: 10px; letter-spacing: .1em; text-transform: uppercase; }
.guide-table td { padding: 21px 18px; border-top: 1px solid var(--line); vertical-align: top; }
.guide-table td:first-child { width: 26%; font-size: 23px; font-weight: 700; line-height: 1; }
.guide-table td:last-child { color: var(--muted); }

.faq { padding: clamp(70px, 9vw, 116px) 0; }
.faq__head { max-width: 710px; margin-bottom: 30px; }
.faq__head h2 { margin: 0; font-size: clamp(38px, 5vw, 66px); line-height: .94; letter-spacing: -.035em; text-transform: uppercase; }
details { border-top: 1px solid var(--line); }
details:last-child { border-bottom: 1px solid var(--line); }
summary { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 22px 0; cursor: pointer; font-family: "Sofia Sans Condensed", "Arial Narrow", sans-serif; font-size: 29px; font-weight: 700; line-height: 1; list-style: none; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; color: var(--sea); font: 400 30px/1 Onest, sans-serif; }
details[open] summary::after { content: "−"; }
details p { max-width: 750px; margin: 0 0 24px; color: var(--muted); }

.sources { padding: 38px 0 72px; border-top: 1px solid var(--line); }
.sources h2 { margin: 0 0 15px; font-size: 25px; line-height: 1; text-transform: uppercase; }
.sources ul { margin: 0; padding-left: 20px; color: var(--muted); }
.sources li + li { margin-top: 8px; }
.sources a { color: var(--sea); text-decoration: underline; text-decoration-color: oklch(48% .095 207 / .35); text-underline-offset: 3px; }

.site-footer { padding: 55px 0 20px; color: oklch(76% .025 210); background: #071317; }
.site-footer__top { display: flex; align-items: end; justify-content: space-between; gap: 26px; }
.site-footer .brand { display: block; margin-bottom: 13px; }
.site-footer p { max-width: 520px; margin: 0; }
.site-footer__nav { display: flex; flex-wrap: wrap; justify-content: end; gap: 10px 22px; color: var(--snow); font-size: 12px; font-weight: 700; letter-spacing: .07em; text-transform: uppercase; }
.site-footer__note { margin-top: 44px; padding-top: 17px; border-top: 1px solid oklch(94% .01 210 / .15); color: oklch(60% .02 210); font-size: 11px; }

@media (max-width: 800px) {
  .topline nav { gap: 13px; }
  .topline nav a:nth-child(-n+2) { display: none; }
  .guide-hero { min-height: 560px; }
  .guide-hero__body { padding-top: 82px; }
  .introduction, .section-head, .check-layout, .dark-callout__grid { grid-template-columns: 1fr; gap: 25px; }
  .step { grid-template-columns: 58px minmax(0, 1fr); gap: 18px; }
  .step p { grid-column: 2; }
  .step__rule { grid-column: 2; }
  .site-footer__top { align-items: start; flex-direction: column; }
  .site-footer__nav { justify-content: start; }
}

@media (max-width: 540px) {
  .shell { width: calc(100% - 32px); }
  .topline { padding: 18px 0; font-size: 10px; }
  .brand { font-size: 16px; letter-spacing: .1em; }
  .guide-hero { min-height: 530px; }
  .guide-hero__body { padding: 74px 0 58px; }
  h1 { font-size: clamp(43px, 14vw, 61px); line-height: .92; }
  .guide-hero__lead { margin-top: 22px; font-size: 16px; }
  .hero-links { gap: 10px 18px; }
  .introduction { padding: 68px 0; }
  .step { grid-template-columns: 44px minmax(0, 1fr); padding: 25px 0; }
  .step__number { font-size: 28px; }
  .step h3 { font-size: 31px; }
  .step p, .step__rule { font-size: 15px; }
  .button { width: 100%; }
  .button + .button { margin: 10px 0 0; }
  .checklist li { grid-template-columns: 24px minmax(0, 1fr); }
  summary { font-size: 25px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; }
}