:root {
  --color-canvas: #FFFFFF;
  --color-panel: #F6F7F8;
  --color-panel-strong: #EDEFF1;
  --color-line: #D8DCDF;
  --color-accent: #F0540A;
  --color-accent-deep: #C24106;
  --color-ink: #131C24;
  --color-ink-soft: #5A6672;
  --color-success: #1E8A4C;
  --color-warning: #B87A0C;
  --color-error: #CC3125;
  --color-flag-navy: #33406E;
  --color-flag-blue: #1F4E93;
  --color-flag-gold: #F1C24B;
  --color-overlay: rgb(19 28 36 / 42%);

  --font-display: 'Inter', 'Noto Sans SC', -apple-system, 'Segoe UI', 'PingFang SC', 'Hiragino Sans', 'Malgun Gothic', sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', -apple-system, 'Segoe UI', 'PingFang SC', 'Hiragino Sans', 'Malgun Gothic', sans-serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, 'Liberation Mono', monospace;

  --radius-none: 0;
  --line-thin: 1px;
  --line-medium: 1.5px;
  --header-height: 68px;
  --content-max: 1240px;
  --reading-max: 57rem;
  --gutter: clamp(16px, 4vw, 48px);
  --section-space: clamp(64px, 9vw, 112px);
  --toc-offset: 78px;
  --motion-fast: 150ms;
  --motion-base: 420ms;
  --easing-standard: cubic-bezier(.2, .7, .2, 1);
}

*,
*::before,
*::after {
  box-sizing: border-box;
  min-width: 0;
}

html {
  margin: 0;
  padding: 0;
  scroll-behavior: smooth;
  background: var(--color-canvas);
}

html.nav-open {
  overflow: hidden;
}

body {
  min-width: 320px;
  margin: 0;
  padding: 0;
  overflow-x: clip;
  background: var(--color-canvas);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

main,
header,
footer,
section,
article,
aside,
nav,
figure {
  min-width: 0;
}

img,
svg,
video,
canvas {
  display: block;
  max-width: 100%;
}

img {
  height: auto;
}

button,
input,
select,
textarea {
  color: inherit;
  font: inherit;
}

button,
summary {
  cursor: pointer;
}

a {
  color: inherit;
  text-decoration: none;
}

ul,
ol {
  margin: 0;
  padding: 0;
}

nav ul,
.site-footer ul,
.platforms-row,
.trust-list,
.badge-list {
  list-style: none;
}

h1,
h2,
h3,
h4,
p,
figure,
blockquote,
pre {
  margin-top: 0;
}

h1,
h2,
h3,
h4 {
  color: var(--color-ink);
  font-family: var(--font-display);
  text-wrap: balance;
}

h1 {
  margin-bottom: 24px;
  font-size: clamp(52px, 5vw, 72px);
  font-weight: 800;
  letter-spacing: -.015em;
  line-height: 1.1;
}

h2 {
  margin-bottom: 20px;
  font-size: clamp(32px, 3.4vw, 48px);
  font-weight: 800;
  letter-spacing: -.012em;
  line-height: 1.16;
}

h3 {
  margin-bottom: 14px;
  font-size: clamp(22px, 2vw, 28px);
  font-weight: 750;
  line-height: 1.25;
}

h4 {
  margin-bottom: 10px;
  font-size: 18px;
  font-weight: 750;
}

p {
  margin-bottom: 1.15em;
}

strong {
  color: var(--color-ink);
  font-weight: 750;
}

code,
kbd,
samp {
  font-family: var(--font-mono);
}

:not(pre) > code {
  overflow-wrap: anywhere;
  border: var(--line-thin) solid var(--color-line);
  background: var(--color-panel);
  padding: .12em .36em;
  color: var(--color-accent-deep);
}

pre {
  max-width: 100%;
  overflow-x: auto;
  border-left: 5px solid var(--color-accent);
  background: var(--color-ink);
  padding: 20px;
  color: var(--color-canvas);
  -webkit-overflow-scrolling: touch;
}

pre code {
  white-space: pre;
  overflow-wrap: normal;
}

:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 3px;
}

::selection {
  background: var(--color-accent);
  color: var(--color-canvas);
}

.wrap {
  width: 100%;
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.reading-wrap {
  width: 100%;
  max-width: calc(var(--reading-max) + (var(--gutter) * 2));
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section {
  padding-top: var(--section-space);
  padding-bottom: var(--section-space);
}

.section-tight {
  padding-top: clamp(42px, 6vw, 72px);
  padding-bottom: clamp(42px, 6vw, 72px);
}

.section-head {
  max-width: 760px;
  margin-bottom: clamp(32px, 5vw, 56px);
}

.section-head p {
  color: var(--color-ink-soft);
  font-size: 18px;
}

.kicker,
.eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  color: var(--color-ink-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.kicker::before {
  width: 8px;
  height: 8px;
  flex: 0 0 auto;
  background: var(--color-accent);
  content: "";
}

.sheet-no {
  display: inline-block;
  flex: 0 0 auto;
  background: var(--color-accent);
  padding: 3px 8px;
  color: var(--color-canvas);
  font-weight: 700;
  letter-spacing: .1em;
}

.accent-text {
  color: var(--color-accent);
}

.no-break {
  white-space: nowrap;
}

.muted {
  color: var(--color-ink-soft);
}

.mono {
  font-family: var(--font-mono);
}

.badge,
.tag,
.fact-chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  max-width: 100%;
  overflow: hidden;
  border: var(--line-thin) solid var(--color-line);
  background: var(--color-panel);
  padding: 6px 10px;
  color: var(--color-ink-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 650;
}

.badge-accent,
.tag-accent {
  border-color: var(--color-accent);
  background: var(--color-accent);
  color: var(--color-canvas);
}

.badge-dot::before,
.status-dot {
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  background: var(--color-accent);
  content: "";
}

.btn,
.btn-main,
.btn-sub,
.btn-login {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  gap: 10px;
  border-radius: var(--radius-none);
  padding: 13px 26px;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 750;
  line-height: 1.2;
  text-align: center;
  transition:
    background-color var(--motion-fast) ease,
    border-color var(--motion-fast) ease,
    color var(--motion-fast) ease,
    transform var(--motion-fast) ease;
}

.btn:hover,
.btn-main:hover,
.btn-sub:hover,
.btn-login:hover {
  transform: translateY(-1px);
}

.btn-primary,
.btn-main {
  border: var(--line-medium) solid var(--color-accent);
  background: var(--color-accent);
  color: var(--color-canvas);
}

.btn-primary:hover,
.btn-main:hover {
  border-color: var(--color-accent-deep);
  background: var(--color-accent-deep);
}

.btn-secondary,
.btn-sub,
.btn-login {
  border: var(--line-medium) solid var(--color-ink);
  background: var(--color-canvas);
  color: var(--color-ink);
}

.btn-secondary:hover,
.btn-sub:hover,
.btn-login:hover {
  border-color: var(--color-accent-deep);
  color: var(--color-accent-deep);
}

.btn-quiet {
  border: var(--line-thin) solid var(--color-line);
  background: var(--color-panel);
  color: var(--color-ink);
}

.btn[aria-disabled="true"],
.btn:disabled {
  cursor: not-allowed;
  border-color: var(--color-line);
  background: var(--color-panel-strong);
  color: var(--color-ink-soft);
  transform: none;
}

.panel,
.card {
  border: var(--line-thin) solid var(--color-line);
  border-radius: var(--radius-none);
  background: var(--color-canvas);
}

.panel {
  padding: clamp(22px, 3vw, 36px);
}

.panel-muted {
  background: var(--color-panel);
}

.card {
  position: relative;
  padding: 24px;
}

.card::before {
  position: absolute;
  top: -1px;
  right: -1px;
  left: -1px;
  height: 4px;
  background: var(--color-accent);
  content: "";
}

.split-grid,
.card-grid,
.footer-grid {
  display: grid;
  gap: 24px;
}

.split-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.card-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.inline-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.inline-list > * {
  min-width: 0;
}

.icon-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 20px;
}

.icon-label {
  display: inline-flex;
  min-width: 0;
  align-items: center;
  gap: 8px;
}

.icon-label svg,
.icon-label .icon-box {
  width: 20px;
  height: 20px;
  flex: 0 0 auto;
}

.site-header {
  position: relative;
  z-index: 60;
  height: var(--header-height);
  border-bottom: var(--line-thin) solid var(--color-line);
  background: var(--color-canvas);
}

.top {
  display: flex;
  height: var(--header-height);
  align-items: center;
  gap: 30px;
  padding-inline: var(--gutter);
}

.brand {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 10px;
}

.brand-logo {
  width: 30px;
  height: 30px;
  flex: 0 0 auto;
}

.brand-name {
  color: var(--color-ink);
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -.01em;
}

.brand-local {
  border-left: var(--line-thin) solid var(--color-line);
  padding-left: 9px;
  color: var(--color-ink-soft);
  font-size: 12px;
  font-weight: 600;
  white-space: nowrap;
}

.tabs-nav {
  display: flex;
  height: var(--header-height);
  align-items: stretch;
}

.tabs-nav a {
  position: relative;
  display: flex;
  align-items: center;
  padding-inline: 12px;
  color: var(--color-ink-soft);
  font-size: 14px;
  font-weight: 650;
  white-space: nowrap;
}

.tabs-nav a::after {
  position: absolute;
  right: 12px;
  bottom: -1px;
  left: 12px;
  height: 3px;
  background: transparent;
  content: "";
}

.tabs-nav a:hover {
  color: var(--color-ink);
}

.tabs-nav a:hover::after {
  background: var(--color-line);
}

.tabs-nav a.is-on {
  color: var(--color-ink);
}

.tabs-nav a.is-on::after {
  background: var(--color-accent);
}

.header-tools {
  display: flex;
  margin-left: auto;
  align-items: center;
  gap: 12px;
}

.language-picker {
  position: relative;
}

.language-button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  gap: 6px;
  border: 0;
  background: transparent;
  padding: 8px;
  color: var(--color-ink-soft);
  font-size: 13px;
  white-space: nowrap;
}

.language-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  z-index: 80;
  display: none;
  width: 170px;
  border: var(--line-thin) solid var(--color-line);
  background: var(--color-canvas);
}

.language-picker.is-open .language-menu {
  display: block;
}

.language-menu a {
  display: flex;
  min-height: 44px;
  align-items: center;
  padding: 10px 14px;
  color: var(--color-ink-soft);
}

.language-menu a:hover,
.language-menu a[aria-current="true"] {
  background: var(--color-panel);
  color: var(--color-ink);
}

.header-login {
  min-height: 40px;
  padding: 9px 21px;
  white-space: nowrap;
}

.menu-toggle {
  display: none;
  width: 44px;
  min-width: 44px;
  height: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  border: var(--line-thin) solid var(--color-line);
  background: var(--color-canvas);
  color: var(--color-ink);
}

.menu-toggle svg {
  width: 22px;
  height: 22px;
}

.mobile-drawer {
  position: absolute;
  top: var(--header-height);
  right: 0;
  left: 0;
  z-index: 75;
  display: none;
  max-height: calc(100dvh - var(--header-height));
  overflow-y: auto;
  overscroll-behavior: contain;
  border-bottom: var(--line-thin) solid var(--color-line);
  background: var(--color-canvas);
  -webkit-overflow-scrolling: touch;
}

.mobile-drawer.is-open {
  display: block;
}

.mobile-drawer a {
  display: flex;
  width: 100%;
  min-height: 48px;
  align-items: center;
  border-bottom: var(--line-thin) solid var(--color-line);
  padding: 12px var(--gutter);
  color: var(--color-ink);
  font-weight: 650;
}

.mobile-drawer a.is-on {
  border-left: 5px solid var(--color-accent);
  background: var(--color-panel);
}

.mobile-language-label {
  padding: 16px var(--gutter) 6px;
  color: var(--color-ink-soft);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
}

.nav-veil {
  position: fixed;
  inset: var(--header-height) 0 0;
  z-index: 50;
  display: none;
  border: 0;
  background: var(--color-overlay);
}

.nav-veil.is-open {
  display: block;
}

.hero {
  display: grid;
  min-height: clamp(620px, calc(100vh - 128px), 812px);
  grid-template-columns: 47% 53%;
  overflow-x: clip;
}

.hero-copy {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 22px;
  padding: 56px 56px 44px 48px;
}

.hero-copy h1 {
  margin: 0;
  font-size: clamp(52px, 4.9vw, 70px);
  line-height: 1.1;
}

.hero-copy h1 em {
  color: var(--color-accent);
  font-style: normal;
}

.hero-sub {
  max-width: 31em;
  margin: 0;
  color: var(--color-ink-soft);
  font-size: 17px;
  line-height: 1.8;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
}

.hero .btn-main {
  padding: 15px 34px;
  font-size: 16px;
}

.hero .btn-sub {
  padding: 14px 30px;
  font-size: 16px;
}

.trust-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.trust-list li {
  display: flex;
  min-width: 0;
  align-items: center;
  gap: 8px;
  border: var(--line-thin) solid var(--color-line);
  background: var(--color-panel);
  padding: 7px 13px;
  color: var(--color-ink-soft);
  font-size: 13px;
  font-weight: 650;
}

.trust-list li::before {
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  background: var(--color-accent);
  content: "";
}

.platforms {
  border-top: var(--line-thin) dashed var(--color-line);
  padding-top: 18px;
}

.platforms-label {
  margin: 0 0 12px;
  color: var(--color-ink-soft);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
}

.platforms-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 26px;
}

.platforms-row li {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--color-ink);
  font-size: 13px;
  font-weight: 650;
}

.platforms-row svg {
  width: 19px;
  height: 19px;
  flex: 0 0 auto;
  color: var(--color-ink);
}

.hero-art {
  position: relative;
  overflow: hidden;
  border-left: var(--line-thin) solid var(--color-line);
  background: var(--color-panel);
}

.hero-art > svg {
  width: 100%;
  height: 100%;
}

.blueprint-grid {
  stroke: var(--color-panel-strong);
  stroke-width: 1;
}

.drawing-border {
  fill: none;
  stroke: var(--color-line);
}

.drawing-ground {
  stroke: var(--color-line);
  stroke-width: 2;
}

.drawing-dash {
  fill: none;
  stroke: var(--color-line);
  stroke-width: 1.2;
  stroke-dasharray: 5 5;
}

.drawing-pier {
  stroke: var(--color-line);
  stroke-width: 2.5;
}

.drawing-ramp {
  fill: none;
  stroke: var(--color-accent);
  stroke-width: 3.5;
  stroke-linejoin: miter;
}

.drawing-gate {
  fill: var(--color-panel-strong);
  stroke: var(--color-line);
  stroke-width: 1.5;
}

.drawing-cap,
.drawing-foot {
  fill: var(--color-line);
}

.drawing-sign {
  fill: var(--color-canvas);
  stroke: var(--color-line);
  stroke-width: 1.5;
}

.drawing-accent {
  fill: var(--color-accent);
}

.drawing-note {
  fill: var(--color-ink-soft);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .05em;
}

.drawing-heading {
  fill: var(--color-ink);
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 650;
}

.drawing-name {
  fill: var(--color-ink);
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 650;
}

.flag-white {
  fill: var(--color-canvas);
}

.flag-red {
  fill: var(--color-error);
}

.flag-navy {
  fill: var(--color-flag-navy);
}

.flag-blue {
  fill: var(--color-flag-blue);
}

.flag-gold {
  fill: var(--color-flag-gold);
}

.flag-ink {
  fill: var(--color-ink);
}

.flag-frame {
  fill: none;
  stroke: var(--color-line);
  stroke-width: 1;
}

.statsband {
  display: flex;
  border-top: var(--line-thin) solid var(--color-line);
  background: var(--color-canvas);
}

.statsband-cell {
  display: flex;
  flex: 1;
  flex-direction: column;
  gap: 3px;
  border-left: var(--line-thin) solid var(--color-line);
  padding: 16px 24px 18px;
}

.statsband-cell:first-child {
  border-left: 0;
  padding-left: 48px;
}

.statsband-key {
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .12em;
}

.statsband-value {
  color: var(--color-ink);
  font-size: 15px;
  font-weight: 750;
}

.site-footer {
  border-top: var(--line-thin) solid var(--color-line);
  background: var(--color-panel);
}

.footer-main {
  padding-top: 64px;
  padding-bottom: 48px;
}

.footer-grid {
  grid-template-columns: 1.25fr 1fr 1.35fr .8fr;
}

.footer-brand p {
  max-width: 30em;
  color: var(--color-ink-soft);
}

.footer-title {
  margin-bottom: 14px;
  color: var(--color-ink);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
}

.footer-links {
  display: grid;
  gap: 8px;
}

.footer-links a {
  display: inline-flex;
  min-height: 32px;
  align-items: center;
  color: var(--color-ink-soft);
}

.footer-links a:hover {
  color: var(--color-accent-deep);
}

.footer-keywords {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.footer-keywords a {
  border: var(--line-thin) solid var(--color-line);
  background: var(--color-canvas);
  padding: 5px 8px;
  color: var(--color-ink-soft);
  font-size: 12px;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  border-top: var(--line-thin) solid var(--color-line);
  padding-top: 18px;
  padding-bottom: 22px;
  color: var(--color-ink-soft);
  font-size: 12px;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.reveal {
  transition:
    opacity var(--motion-base) var(--easing-standard),
    transform var(--motion-base) var(--easing-standard);
}

.reveal.pending {
  opacity: 0;
  transform: translateY(16px);
}

.reveal.shown {
  opacity: 1;
  transform: none;
}

.tilt,
.tilt-card {
  transform: rotate(.35deg);
}

body:has(.toc-tabs) section[id] {
  scroll-margin-top: calc(var(--toc-offset) + 28px);
}

@media (max-width: 1180px) {
  .tabs-nav a {
    padding-inline: 8px;
    font-size: 13px;
  }

  .tabs-nav a::after {
    right: 8px;
    left: 8px;
  }

  .hero-copy {
    padding: 44px 36px;
  }

  .brand-local {
    display: none;
  }
}

@media (max-width: 980px) {
  .tabs-nav {
    display: none;
  }

  .header-tools {
    margin-left: auto;
  }

  .menu-toggle {
    display: inline-flex;
  }

  .language-picker {
    display: none;
  }

  .footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
  }

  .hero-art {
    min-height: 380px;
    border-top: var(--line-thin) solid var(--color-line);
    border-left: 0;
  }

  .statsband {
    flex-wrap: wrap;
  }

  .statsband-cell {
    flex: 1 1 40%;
  }

  .statsband-cell:first-child {
    padding-left: 24px;
  }

  .card-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 768px) {
  :root {
    --toc-offset: 68px;
  }

  h1,
  .hero-copy h1 {
    font-size: clamp(28px, 9vw, 40px);
    letter-spacing: -.015em;
    line-height: 1.12;
  }

  h2 {
    font-size: clamp(28px, 8vw, 38px);
  }

  .top {
    gap: 10px;
  }

  .header-login {
    min-height: 42px;
    padding-inline: 14px;
  }

  .hero-copy {
    padding: 36px var(--gutter);
  }

  .hero-sub {
    font-size: 16px;
  }

  .drawing-note {
    display: none;
  }

  .split-grid,
  .card-grid {
    grid-template-columns: 1fr;
  }

  .tilt,
  .tilt-card {
    transform: none;
  }
}

@media (max-width: 640px) {
  :root {
    --gutter: 16px;
  }

  body {
    overflow-x: clip;
  }

  .wrap,
  .reading-wrap {
    width: 100%;
    padding-inline: var(--gutter);
  }

  .no-break {
    white-space: normal;
  }

  .brand-local {
    display: none;
  }

  .brand-name {
    font-size: 17px;
  }

  .brand-logo {
    width: 28px;
    height: 28px;
  }

  .header-tools {
    margin-left: auto;
    gap: 7px;
  }

  .cta-row {
    align-items: stretch;
  }

  .cta-row .btn,
  .cta-row .btn-main,
  .cta-row .btn-sub {
    flex: 1 1 150px;
  }

  .platforms-row {
    gap: 14px 18px;
  }

  .hero-art {
    min-height: 300px;
  }

  .statsband-cell,
  .statsband-cell:first-child {
    flex-basis: 50%;
    padding: 14px 16px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .footer-bottom {
    align-items: flex-start;
    flex-direction: column;
  }

  [class*="watermark"],
  [class*="decor-text"],
  [class*="absolute-note"] {
    display: none;
  }
}

@media (max-width: 390px) {
  .top {
    padding-inline: 14px;
  }

  .header-login {
    padding-inline: 11px;
    font-size: 13px;
  }

  .menu-toggle {
    width: 44px;
    min-width: 44px;
  }

  .trust-list li {
    width: 100%;
  }

  .statsband-cell,
  .statsband-cell:first-child {
    flex-basis: 100%;
    border-left: 0;
    border-top: var(--line-thin) solid var(--color-line);
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation: none !important;
    scroll-behavior: auto !important;
    transition: none !important;
  }

  .reveal,
  .reveal.pending {
    opacity: 1 !important;
    transform: none !important;
  }
}