:root {
  --ink: #12253b;
  --ink-soft: #29435c;
  --muted: #627386;
  --paper: #fbfaf6;
  --surface: #ffffff;
  --surface-soft: #eef4f2;
  --navy: #153b62;
  --navy-deep: #0c2845;
  --teal: #168f88;
  --teal-soft: #dff1ee;
  --coral: #e46f4f;
  --coral-soft: #fae4dc;
  --gold: #f2b84b;
  --gold-soft: #fff1d2;
  --line: #d5dedf;
  --line-strong: #b8c6c9;
  --focus: #1677b9;
  --shadow-soft: 0 18px 45px rgba(18, 37, 59, 0.11);
  --shadow-card: 0 10px 26px rgba(18, 37, 59, 0.07);
  --radius-sm: 10px;
  --radius-md: 18px;
  --radius-lg: 28px;
  --container: 1180px;
  --header-height: 76px;
  --display: "Be Vietnam Pro", "Segoe UI", Arial, sans-serif;
  --body: "Noto Sans", "Segoe UI", Arial, sans-serif;
  --ease: 180ms ease-out;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; background: var(--paper); }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--body); font-size: 1rem; line-height: 1.7; }
body.menu-open { overflow: hidden; }
a { color: inherit; text-decoration-thickness: .08em; text-underline-offset: .18em; }
button, input, textarea, select { font: inherit; }
button, a, summary, label { cursor: pointer; -webkit-tap-highlight-color: transparent; }
img { display: block; max-width: 100%; }
figure, h1, h2, h3, h4, h5, p, ul, ol { margin-top: 0; }
h1, h2, h3, h4, h5 { color: var(--ink); font-family: var(--display); letter-spacing: -.03em; line-height: 1.18; }
h1 { margin-bottom: 1.25rem; font-size: clamp(2.7rem, 5.2vw, 5.2rem); }
h2 { margin-bottom: 1.1rem; font-size: clamp(2rem, 3.5vw, 3.5rem); }
h3 { margin-bottom: .7rem; font-size: clamp(1.25rem, 2vw, 1.65rem); }
h4 { margin-bottom: .7rem; font-size: clamp(1.35rem, 2.4vw, 2.25rem); }
h5 { margin-bottom: .65rem; font-size: clamp(1.05rem, 1.4vw, 1.25rem); }
p { max-width: 72ch; margin-bottom: 1.1rem; color: var(--muted); }
ul { padding-left: 1.25rem; }
section, footer { scroll-margin-top: calc(var(--header-height) + 1rem); }
.container { width: min(calc(100% - 2rem), var(--container)); margin-inline: auto; }
.section-pad { padding-block: clamp(4rem, 7vw, 7rem); }
.section-soft { background: var(--surface-soft); }
.skip-link { position: fixed; top: .8rem; left: .8rem; z-index: 100; padding: .7rem 1rem; border-radius: 999px; background: var(--navy-deep); color: white; transform: translateY(-180%); transition: transform var(--ease); }
.skip-link:focus { transform: translateY(0); }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 4px; }

.site-header { position: sticky; top: 0; z-index: 50; min-height: var(--header-height); border-bottom: 1px solid rgba(18,37,59,.12); background: rgba(251,250,246,.94); backdrop-filter: blur(16px); }
.header-inner { display: flex; min-height: var(--header-height); align-items: center; justify-content: space-between; gap: 2rem; }
.brand-link { display: inline-flex; align-items: center; min-height: 3rem; text-decoration: none; }
.brand-link img { width: min(13rem, 34vw); height: auto; }
.site-nav { display: flex; align-items: center; justify-content: flex-end; gap: clamp(.75rem, 2vw, 1.5rem); }
.site-nav a { position: relative; display: inline-flex; min-height: 2.7rem; align-items: center; color: var(--ink-soft); font-family: var(--display); font-size: .88rem; font-weight: 750; text-decoration: none; }
.site-nav a::after { position: absolute; right: 0; bottom: .2rem; left: 0; height: 2px; background: var(--gold); content: ""; transform: scaleX(0); transform-origin: left; transition: transform var(--ease); }
.site-nav a:hover, .site-nav a:focus-visible { color: var(--navy); }
.site-nav a:hover::after, .site-nav a:focus-visible::after { transform: scaleX(1); }
.site-nav .nav-cta { padding: .55rem 1rem; border-radius: 999px; background: var(--navy); color: white; }
.site-nav .nav-cta::after { display: none; }
.menu-toggle { display: none; min-width: 3rem; min-height: 3rem; align-items: center; justify-content: center; border: 1px solid var(--line); border-radius: 999px; background: var(--surface); color: var(--navy); }
.menu-toggle-icon { display: grid; gap: .23rem; width: 1.2rem; }
.menu-toggle-icon span { display: block; height: 2px; border-radius: 999px; background: currentColor; }
.menu-toggle-label { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; }

.hero-section { position: relative; overflow: clip; background: var(--paper); }
.hero-section::before { position: absolute; top: -13rem; right: -8rem; width: 36rem; height: 36rem; border-radius: 50%; background: radial-gradient(circle, rgba(242,184,75,.22), transparent 68%); content: ""; pointer-events: none; }
.hero-grid { display: grid; align-items: start; gap: clamp(2.5rem, 6vw, 6rem); grid-template-columns: minmax(0, 1.1fr) minmax(21rem, .9fr); }
.hero-copy { max-width: 48rem; padding-top: 1rem; }
.hero-kicker { margin-bottom: .9rem; color: var(--coral); font-family: var(--display); font-size: .78rem; font-weight: 850; letter-spacing: .15em; text-transform: uppercase; }
.hero-lead { max-width: 44rem; color: var(--ink); font-size: clamp(1.08rem, 1.6vw, 1.3rem); line-height: 1.65; }
.hero-note { max-width: 43rem; padding-left: 1.1rem; border-left: 3px solid var(--gold); color: var(--muted); }
.hero-actions { display: flex; flex-wrap: wrap; gap: .75rem; margin-block: 1.8rem 2rem; }
.button { display: inline-flex; min-height: 3rem; align-items: center; justify-content: center; gap: .45rem; padding: .75rem 1.15rem; border: 1px solid transparent; border-radius: 999px; font-family: var(--display); font-size: .92rem; font-weight: 800; line-height: 1.2; text-decoration: none; transition: transform var(--ease), background-color var(--ease), border-color var(--ease), color var(--ease), box-shadow var(--ease); }
.button:hover { transform: translateY(-2px); }
.button-primary { background: var(--coral); box-shadow: 0 10px 22px rgba(228,111,79,.22); color: white; }
.button-primary:hover { background: #c8563b; }
.button-secondary { border-color: var(--line-strong); background: transparent; color: var(--navy); }
.button-secondary:hover { border-color: var(--navy); background: var(--surface); }
.hero-points { display: grid; max-width: 40rem; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 1rem; padding: 0; margin: 0; list-style: none; }
.hero-points li { display: grid; gap: .25rem; color: var(--muted); font-size: .85rem; line-height: 1.45; }
.point-mark { color: var(--teal); font-family: var(--display); font-size: .75rem; font-weight: 850; letter-spacing: .1em; }
.hero-visual { position: relative; margin-top: 2rem; }
.hero-visual img { width: 100%; max-height: 420px; aspect-ratio: 3 / 2; border-radius: var(--radius-lg); box-shadow: var(--shadow-soft); object-fit: cover; }
.hero-visual figcaption { padding-top: .75rem; color: var(--muted); font-size: .82rem; }

.cooperation-form { padding: clamp(1.25rem, 3vw, 1.8rem); border: 1px solid var(--line); border-top: 5px solid var(--gold); border-radius: var(--radius-lg); background: var(--surface); box-shadow: var(--shadow-soft); }
.hero-contact-form { align-self: start; max-width: 34rem; margin-left: auto; }
.form-heading { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; padding-bottom: 1rem; margin-bottom: 1rem; border-bottom: 1px solid var(--line); }
.form-heading h2 { margin-bottom: 0; font-size: clamp(1.65rem, 3vw, 2.4rem); }
.form-heading p { margin: 0; font-size: .78rem; }
.form-intro { font-size: .92rem; }
.cooperation-form label { display: block; margin-bottom: .45rem; color: var(--ink); font-family: var(--display); font-size: .86rem; font-weight: 800; }
.cooperation-form input[type=email], .cooperation-form textarea { display: block; width: 100%; border: 1px solid var(--line-strong); border-radius: var(--radius-sm); background: var(--paper); color: var(--ink); }
.cooperation-form input[type=email] { min-height: 3rem; padding: .7rem .8rem; margin-bottom: 1rem; }
.cooperation-form textarea { min-height: 8rem; padding: .8rem; margin-bottom: .5rem; resize: vertical; }
.cooperation-form input:hover, .cooperation-form textarea:hover { border-color: var(--navy); }
.cooperation-form input:focus, .cooperation-form textarea:focus { border-color: var(--focus); background: white; box-shadow: 0 0 0 4px rgba(22,119,185,.15); outline: 0; }
.form-hint { margin-bottom: 1.1rem; font-size: .78rem; }
.cooperation-form .button { width: 100%; border: 0; }

.section-heading { max-width: 48rem; margin-bottom: 2.7rem; }
.section-heading p:last-child { margin-bottom: 0; }
.section-kicker { margin-bottom: .75rem; color: var(--teal); font-family: var(--display); font-size: .75rem; font-weight: 850; letter-spacing: .14em; text-transform: uppercase; }
.intro-grid { display: grid; align-items: start; gap: clamp(2rem, 6vw, 6rem); grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr); }
.principle-list { display: grid; gap: 1.5rem; }
.principle { display: grid; grid-template-columns: 3.2rem minmax(0,1fr); gap: 1.1rem; padding-top: 1.25rem; border-top: 1px solid var(--line); }
.principle-number { display: inline-flex; width: 2.65rem; height: 2.65rem; align-items: center; justify-content: center; border-radius: 50%; background: var(--gold-soft); color: var(--navy); font-family: var(--display); font-size: .85rem; font-weight: 850; }
.principle h3 { margin-bottom: .4rem; font-size: 1.15rem; }
.principle p { margin-bottom: 0; font-size: .92rem; }

.topic-grid { display: grid; gap: 1rem; grid-template-columns: repeat(3, minmax(0,1fr)); }
.topic-card { padding: 1.35rem; border-top: 4px solid var(--teal); background: var(--surface); box-shadow: var(--shadow-card); }
.topic-card:nth-child(2) { border-top-color: var(--coral); }
.topic-card:nth-child(3) { border-top-color: var(--gold); }
.topic-card h3 { margin-bottom: .55rem; }
.topic-card p { margin-bottom: 0; font-size: .9rem; }
.topic-card a { display: inline-flex; margin-top: 1rem; color: var(--navy); font-weight: 800; text-decoration-color: var(--gold); }

.split-section { display: grid; align-items: center; gap: clamp(2rem, 6vw, 6rem); grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
.split-section.reverse .split-copy { order: 2; }
.split-section.reverse .split-media { order: 1; }
.split-media img { width: 100%; max-height: 410px; aspect-ratio: 3 / 2; border-radius: var(--radius-md); box-shadow: var(--shadow-card); object-fit: cover; }
.split-media figcaption { padding-top: .75rem; color: var(--muted); font-size: .8rem; }
.numbered-list { display: grid; gap: 1rem; padding: 0; margin: 1.5rem 0 0; list-style: none; counter-reset: item; }
.numbered-list li { display: grid; grid-template-columns: 2.25rem minmax(0,1fr); gap: .75rem; align-items: start; color: var(--muted); }
.numbered-list li::before { display: inline-flex; width: 2rem; height: 2rem; align-items: center; justify-content: center; border-radius: 50%; background: var(--teal-soft); color: var(--teal); content: counter(item); counter-increment: item; font-family: var(--display); font-weight: 850; }

.article-grid { display: grid; gap: 1rem; grid-template-columns: repeat(2, minmax(0,1fr)); }
.article-card { padding: 1.4rem; background: var(--surface); border: 1px solid var(--line); }
.article-card h3 { margin-bottom: .6rem; }
.article-card p { margin-bottom: 0; font-size: .91rem; }

.sponsor-section { border-block: 1px solid var(--line); background: #fff8e6; }
.sponsor-shell { display: grid; align-items: start; gap: clamp(1.5rem, 4vw, 4rem); grid-template-columns: minmax(15rem, .4fr) minmax(0, 1.6fr); }
.sponsor-side { max-width: 18rem; padding-right: 1.5rem; border-right: 1px solid rgba(18,37,59,.16); }
.sponsor-label { display: inline-flex; align-items: center; gap: .5rem; margin-bottom: 1rem; color: var(--coral); font-family: var(--display); font-size: .76rem; font-weight: 850; letter-spacing: .13em; text-transform: uppercase; }
.info-mark { display: inline-flex; width: 1.45rem; height: 1.45rem; align-items: center; justify-content: center; border: 1px solid currentColor; border-radius: 50%; font-family: Georgia, serif; font-style: italic; }
.sponsor-logo { width: min(12rem, 100%); height: auto; margin-bottom: 1rem; object-fit: contain; object-position: left center; }
.sponsor-side p { color: var(--ink-soft); font-size: .9rem; }
.sponsor-backlink { color: var(--navy); font-weight: 850; text-decoration-color: var(--gold); }
.sponsor-backlink:hover { color: var(--coral); text-decoration-color: var(--coral); }
.sponsor-copy h4, .sponsor-copy h5 { color: var(--navy-deep); }
.sponsor-copy h4 { max-width: 62rem; }
.sponsor-copy p { font-size: .96rem; }
.sponsor-copy .sponsor-intro { color: var(--ink); font-size: 1.02rem; }
.sponsor-pr-grid { display: grid; gap: 1.5rem; grid-template-columns: repeat(2, minmax(0,1fr)); margin-top: 1.5rem; }
.sponsor-pr-group { padding-top: 1rem; border-top: 2px solid var(--gold); }
.sponsor-pr-group h5 { color: var(--coral); }
.sponsor-cta { padding: 1rem; border: 1px solid rgba(228,111,79,.28); background: white; color: var(--ink) !important; }

.gold-sponsor-section { background: var(--navy-deep); color: white; }
.gold-sponsor-layout { display: grid; gap: clamp(1.5rem, 4vw, 4rem); grid-template-columns: minmax(15rem, .4fr) minmax(0, 1.6fr); }
.gold-identity { padding-right: 1.5rem; border-right: 1px solid rgba(255,255,255,.22); }
.gold-tier { color: var(--gold); font-family: var(--display); font-size: .78rem; font-weight: 850; letter-spacing: .14em; text-transform: uppercase; }
.gold-rule { display: block; width: 3.5rem; height: .22rem; margin: 1rem 0 1.25rem; border-radius: 999px; background: var(--coral); }
.gold-note { color: rgba(255,255,255,.76); font-size: .9rem; }
.gold-copy h2 { color: white; font-size: clamp(1.7rem, 3vw, 2.7rem); }
.gold-copy p { color: rgba(255,255,255,.82); }
.gold-link { color: var(--gold); font-weight: 850; text-decoration-color: var(--coral); }
.gold-link:hover { color: white; text-decoration-color: white; }

.faq-grid { display: grid; align-items: start; gap: clamp(2rem, 6vw, 6rem); grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr); }
.faq-list { border-top: 1px solid var(--line); }
.faq-list details { border-bottom: 1px solid var(--line); }
.faq-list summary { display: flex; min-height: 4rem; align-items: center; justify-content: space-between; gap: 1rem; padding: 1rem 0; color: var(--ink); font-family: var(--display); font-weight: 800; list-style: none; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { display: inline-flex; width: 1.55rem; height: 1.55rem; flex: 0 0 auto; align-items: center; justify-content: center; border: 1px solid var(--line-strong); border-radius: 50%; color: var(--navy); content: "+"; }
.faq-list details[open] summary::after { background: var(--gold-soft); content: "−"; }
.faq-list details p { padding: 0 3rem 1rem 0; margin-bottom: 0; }

.site-footer { padding-top: 4rem; background: var(--navy-deep); color: white; }
.footer-grid { display: grid; gap: 2rem; grid-template-columns: 1.4fr repeat(3, minmax(0,1fr)); padding-bottom: 3.5rem; }
.footer-brand { max-width: 22rem; }
.footer-brand-link { display: inline-flex; align-items: center; margin-bottom: 1rem; }
.footer-brand-link img { width: 12.5rem; filter: brightness(0) invert(1); }
.footer-brand p, .footer-column p, .footer-bottom p { color: rgba(255,255,255,.72); font-size: .85rem; }
.footer-column { display: flex; flex-direction: column; align-items: flex-start; gap: .55rem; }
.footer-column h2 { margin-bottom: .4rem; color: var(--gold); font-size: .8rem; letter-spacing: .08em; text-transform: uppercase; }
.footer-column a { color: rgba(255,255,255,.78); font-size: .86rem; text-decoration-color: transparent; }
.footer-column a:hover { color: white; text-decoration-color: var(--gold); }
.footer-contact p { max-width: 18rem; }
.footer-action { color: var(--gold) !important; font-family: var(--display); font-weight: 850; text-decoration-color: var(--gold) !important; }
.footer-bottom { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding-block: 1rem; border-top: 1px solid rgba(255,255,255,.16); }

.language-switcher { display: flex; flex-wrap: wrap; gap: .45rem; padding: .45rem; border: 1px solid var(--line); border-radius: 999px; background: var(--surface); }
.language-switcher a { padding: .35rem .65rem; border-radius: 999px; color: var(--ink-soft); font-family: var(--display); font-size: .75rem; font-weight: 800; text-decoration: none; }
.language-switcher a[aria-current=page] { background: var(--navy); color: white; }
.locale-note { margin-top: 1rem; color: var(--muted); font-size: .78rem; }

@media (max-width: 1120px) {
  .site-nav { gap: .9rem; }
  .site-nav a { font-size: .82rem; }
  .topic-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .footer-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
}

@media (max-width: 920px) {
  :root { --header-height: 70px; }
  .hero-grid, .intro-grid, .split-section, .faq-grid, .sponsor-shell, .gold-sponsor-layout { grid-template-columns: minmax(0,1fr); }
  .hero-contact-form { max-width: none; margin-left: 0; }
  .hero-visual { margin-top: 0; }
  .split-section.reverse .split-copy, .split-section.reverse .split-media { order: initial; }
  .sponsor-side, .gold-identity { max-width: none; padding-right: 0; padding-bottom: 1.25rem; border-right: 0; border-bottom: 1px solid rgba(18,37,59,.16); }
  .gold-identity { border-bottom-color: rgba(255,255,255,.22); }
}

@media (max-width: 760px) {
  .menu-toggle { display: inline-flex; }
  .site-nav { position: absolute; top: calc(100% + .6rem); right: 1rem; left: 1rem; display: grid; max-height: 0; gap: 0; overflow: clip; padding: 0 1rem; border: 1px solid transparent; border-radius: var(--radius-md); background: var(--surface); box-shadow: none; opacity: 0; pointer-events: none; transform: translateY(-.5rem); transition: max-height 220ms ease-out, opacity 180ms ease-out, transform 220ms ease-out, padding 220ms ease-out, border-color 180ms ease-out, box-shadow 180ms ease-out; }
  .site-nav.is-open { max-height: 30rem; padding: .75rem 1rem; border-color: var(--line); box-shadow: var(--shadow-soft); opacity: 1; pointer-events: auto; transform: translateY(0); }
  .site-nav a { min-height: 3.2rem; border-bottom: 1px solid var(--surface-soft); font-size: .92rem; }
  .site-nav a:last-child { border-bottom: 0; }
  .site-nav .nav-cta { justify-content: center; margin-top: .5rem; }
  .hero-section { padding-top: 3.5rem; }
  .hero-points { gap: .7rem; }
  .sponsor-pr-grid, .article-grid { grid-template-columns: minmax(0,1fr); }
}

@media (max-width: 560px) {
  .container { width: min(calc(100% - 1.5rem), var(--container)); }
  .section-pad { padding-block: 3.8rem; }
  h1 { font-size: clamp(2.4rem, 12vw, 4rem); }
  h2 { font-size: clamp(1.95rem, 9vw, 3rem); }
  .hero-actions { align-items: stretch; flex-direction: column; }
  .hero-actions .button { width: 100%; }
  .hero-points { grid-template-columns: 1fr; }
  .hero-points li { display: flex; align-items: center; gap: .55rem; }
  .footer-grid { grid-template-columns: minmax(0,1fr); }
  .footer-bottom { align-items: flex-start; flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto !important; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; scroll-behavior: auto !important; transition-duration: .01ms !important; }
}