/* CaseBasis.ai — static launch site. No build step or external dependencies. */
:root {
  color-scheme: light;
  --blue: #123565;
  --deep: #0b2344;
  --ink: #1b2d46;
  --muted: #52627a;
  --teal: #116c66;
  --mint: #bde2db;
  --light: #f3f6f9;
  --line: #dbe3ec;
  --white: #fff;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 26px; }
body { margin: 0; color: var(--ink); background: var(--white); font-family: Arial, Helvetica, sans-serif; font-size: 17px; line-height: 1.7; -webkit-font-smoothing: antialiased; }
[hidden] { display: none !important; }
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-underline-offset: 4px; }
a, summary { -webkit-tap-highlight-color: transparent; }
a:focus-visible, summary:focus-visible { outline: 3px solid #bd662b; outline-offset: 6px; }
::selection { color: var(--deep); background: var(--mint); }
p, h1, h2, h3 { margin-top: 0; }
h1, h2, h3 { text-wrap: balance; }
p { margin-bottom: 20px; }
.wrap { width: min(1200px, calc(100% - 80px)); margin-inline: auto; }
.skip-link { position: absolute; top: -100px; left: 16px; z-index: 10; padding: 10px 18px; background: var(--white); color: var(--ink); }
.skip-link:focus { top: 12px; }
.eyebrow { font-size: 12px; font-weight: 700; line-height: 1.6; letter-spacing: .13em; text-transform: uppercase; }
.utility { background: var(--deep); color: #dce7f0; }
.utility p { margin: 0; padding-block: 9px; text-align: center; font-size: 13px; line-height: 1.6; }
.utility strong { margin-left: 10px; color: var(--mint); }
.brand-row { min-height: 116px; padding-block: 20px; display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 2fr) minmax(0, 1fr); align-items: center; gap: 20px; }
.icon-slot { min-width: 0; }
.home-icon { display: grid; place-items: center; width: 44px; height: 44px; text-decoration: none; }
.home-icon img { width: 44px; height: 44px; object-fit: contain; }
.brand { display: grid; place-items: center; justify-self: center; min-height: 68px; width: min(100%, 400px); text-decoration: none; }
.wordmark { color: var(--blue); font-size: 42px; line-height: 1.15; font-weight: 400; letter-spacing: -1.8px; white-space: nowrap; }
.wordmark b { font-weight: 750; }
.domain { color: var(--teal); font-size: .7em; letter-spacing: -1px; }
.wordmark::after { content: ""; display: block; width: 44px; height: 3px; margin: 9px auto 0; background: var(--teal); }
.brand img { width: auto; max-width: 100%; max-height: 90px; object-fit: contain; }
.header-link { justify-self: end; display: inline-flex; gap: 12px; font-size: 14px; font-weight: 700; text-decoration: none; border-bottom: 1px solid #aab9c7; padding-block: 5px; white-space: nowrap; }
.header-link:hover { color: var(--teal); border-color: var(--teal); }
.nav { border-top: 1px solid #edf1f5; border-bottom: 1px solid var(--line); }
.nav .wrap { display: flex; justify-content: center; gap: 40px; padding-block: 11px; }
.nav a { font-size: 14px; font-weight: 700; text-decoration: none; color: #42556c; }
.nav a:hover { color: var(--teal); text-decoration: underline; }

.hero { position: relative; background: var(--blue); color: var(--white); overflow: hidden; }
.hero::before { content: ""; position: absolute; inset: 0; pointer-events: none; background: linear-gradient(118deg, transparent 61%, #ffffff04 61%, #ffffff04 79%, transparent 79%); }
.hero-grid { position: relative; display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, .95fr); align-items: center; gap: 68px; padding-block: 68px 72px; }
.hero .eyebrow { color: #d5e5ed; margin-bottom: 22px; }
.status-dot { display: inline-block; width: 7px; height: 7px; margin-right: 7px; border-radius: 50%; background: var(--mint); vertical-align: 1px; }
.hero h1 { font-size: clamp(42px, 4.5vw, 60px); line-height: 1.1; letter-spacing: -2px; margin-bottom: 26px; }
.hero h1 .accent { color: var(--mint); }
.lead { color: #e0e8f1; font-size: 19px; line-height: 1.75; max-width: 530px; margin-bottom: 28px; }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 18px 22px; }
.button { display: inline-flex; justify-content: center; align-items: center; gap: 18px; min-height: 52px; padding: 12px 20px; border: 1px solid var(--mint); border-radius: 5px; color: var(--deep); background: var(--mint); font-size: 15px; font-weight: 700; text-decoration: none; transition: background .15s ease; }
.button:hover { background: #d9eee9; }
.text-link { display: inline-flex; align-items: center; gap: 10px; font-size: 15px; font-weight: 700; text-decoration-thickness: 1px; }
.text-link:hover { text-decoration-thickness: 2px; }
.hero-note { margin: 27px 0 0; font-size: 13px; color: #c9d9e8; }
.case-panel { padding: 27px 30px 23px; border: 1px solid #d0dce6; border-radius: 10px; background: var(--white); color: var(--ink); box-shadow: 0 20px 40px #030e2036; }
.panel-top { display: flex; justify-content: space-between; align-items: center; gap: 15px; padding-bottom: 19px; margin-bottom: 22px; border-bottom: 1px solid var(--line); }
.panel-label { color: var(--muted); font-size: 10px; letter-spacing: .12em; font-weight: 700; text-transform: uppercase; }
.outline-badge { color: var(--teal); background: #eaf5f1; border: 1px solid #ccdfd8; border-radius: 4px; padding: 2px 9px; font-size: 11px; font-weight: 700; }
.case-panel h2 { font-size: 28px; line-height: 1.2; letter-spacing: -.75px; margin-bottom: 12px; }
.panel-intro { font-size: 14px; color: var(--muted); line-height: 1.65; margin-bottom: 18px; }
.outline-list { padding: 0; margin: 0; list-style: none; }
.outline-list li { display: flex; align-items: start; gap: 13px; padding-block: 13px; border-top: 1px solid #e6ebf0; }
.outline-number { flex: 0 0 28px; padding-top: 1px; color: var(--teal); font-size: 11px; font-weight: 700; line-height: 23px; }
.outline-list h3 { font-size: 15px; line-height: 1.5; margin-bottom: 2px; }
.outline-list p { font-size: 12px; line-height: 1.6; margin-bottom: 0; color: var(--muted); }
.panel-note { margin: 12px 0 0; padding-top: 16px; border-top: 1px solid var(--line); font-size: 11px; line-height: 1.65; color: var(--muted); }
.principles { background: #edf3f8; border-bottom: 1px solid #e1e9f0; }
.principles .wrap { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); padding-block: 23px; }
.principles p { display: flex; justify-content: center; align-items: center; gap: 12px; font-size: 14px; font-weight: 700; margin: 0; padding-inline: 10px; }
.principles p + p { border-left: 1px solid #cbd9e6; }
.principles span { color: var(--teal); font-size: 12px; }

.section { padding-block: 78px; }
.section-heading { max-width: 720px; margin-bottom: 40px; }
.section-heading .eyebrow { color: var(--teal); margin-bottom: 12px; }
.section-heading h2 { font-size: clamp(30px, 3.2vw, 43px); line-height: 1.18; letter-spacing: -1.25px; margin-bottom: 19px; }
.section-heading > p:not(.eyebrow) { font-size: 17px; color: var(--muted); }
.section-heading > :last-child { margin-bottom: 0; }
.steps { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 30px; padding: 0; margin: 0; list-style: none; }
.step { border-top: 2px solid #c6d4e1; padding-top: 21px; }
.step-number { display: block; color: var(--teal); font-size: 14px; font-weight: 700; margin-bottom: 14px; }
.step h3 { font-size: 21px; letter-spacing: -.35px; line-height: 1.3; margin-bottom: 11px; }
.step p { font-size: 15px; color: var(--muted); line-height: 1.75; margin: 0; }
.section-note { color: var(--muted); font-size: 13px; line-height: 1.7; margin: 32px 0 0; }
.evidence { background: var(--light); border-block: 1px solid #e4eaf0; }
.evidence-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); align-items: center; gap: 85px; }
.evidence .section-heading { margin: 0; }
.section-heading .small-note { font-size: 13px; }
.evidence-list { padding: 0; margin: 0; list-style: none; border-top: 1px solid #cfdae5; }
.evidence-list li { display: grid; grid-template-columns: 59px minmax(0, 1fr); align-items: center; gap: 20px; padding-block: 23px; border-bottom: 1px solid #cfdae5; }
.material-tag { display: grid; place-items: center; width: 58px; height: 56px; border: 1px solid #cad6e1; border-radius: 5px; background: var(--white); color: var(--teal); font-size: 20px; font-weight: 400; }
.evidence-list h3 { margin: 0 0 3px; font-size: 18px; line-height: 1.4; }
.evidence-list p { margin: 0; font-size: 14px; color: var(--muted); line-height: 1.6; }
.use-cases { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 38px; }
.basis-note { display: grid; grid-template-columns: 220px minmax(0, 1fr); align-items: start; gap: 30px; padding-top: 30px; margin-top: 42px; border-top: 1px solid var(--line); }
.basis-note .eyebrow { color: var(--teal); padding-top: 4px; }
.basis-note p { margin: 0; color: var(--blue); font-size: 23px; line-height: 1.5; letter-spacing: -.4px; }
.development { background: var(--deep); color: var(--white); }
.development-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 90px; }
.development .section-heading { margin-bottom: 0; }
.development .section-heading .eyebrow { color: var(--mint); }
.development .section-heading > p:not(.eyebrow), .development-detail > p { color: #cddce9; }
.development .text-link { color: var(--mint); margin-top: 6px; }
.development-detail { border-left: 1px solid #405470; padding-left: 38px; }
.development-detail .development-status { color: var(--mint); font-size: 13px; font-weight: 700; margin-bottom: 22px; }
.development-detail h3 { font-size: 23px; line-height: 1.4; margin-bottom: 15px; letter-spacing: -.4px; }
.development-detail p { font-size: 15px; line-height: 1.8; }
.development-detail .development-invite { margin-bottom: 0; padding-top: 18px; border-top: 1px solid #405470; font-size: 14px; }
.faq-grid { display: grid; grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr); gap: 80px; }
.faq-grid .section-heading { margin: 0; }
.faqs { border-top: 1px solid var(--line); }
details { border-bottom: 1px solid var(--line); padding-block: 20px; }
summary { display: flex; justify-content: space-between; align-items: center; gap: 22px; list-style: none; cursor: pointer; font-size: 17px; font-weight: 700; line-height: 1.5; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; color: var(--teal); font-size: 27px; font-weight: 400; line-height: 1; flex-shrink: 0; }
details[open] > summary::after { content: "−"; }
details p { margin: 14px 28px 0 0; color: var(--muted); font-size: 15px; line-height: 1.8; }
.contact { padding-block: 54px; background: #edf3f8; border-top: 1px solid #dce5ee; }
.contact-grid { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, .8fr); gap: 80px; align-items: center; }
.contact .eyebrow { color: var(--teal); margin-bottom: 10px; }
.contact h2 { color: var(--blue); font-size: 32px; letter-spacing: -.8px; line-height: 1.3; margin-bottom: 15px; }
.contact p { color: var(--muted); font-size: 16px; margin-bottom: 18px; }
.contact-email { display: inline-flex; align-items: center; flex-wrap: wrap; gap: 12px; font-size: clamp(20px, 2.3vw, 28px); font-weight: 700; color: var(--blue); text-decoration-thickness: 1px; letter-spacing: -.4px; overflow-wrap: anywhere; }
.contact .contact-note { font-size: 13px; margin: 17px 0 0; }
.legal-contact { border-left: 1px solid #cbd9e6; padding-left: 32px; }
.legal-contact h3 { font-size: 18px; line-height: 1.45; margin-bottom: 12px; }
.legal-contact p { font-size: 14px; }
.legal-contact .text-link { color: var(--teal); font-size: 14px; }

.footer { background: var(--white); color: var(--muted); padding-block: 32px 22px; border-top: 1px solid var(--line); }
.footer-line { display: flex; justify-content: space-between; gap: 28px; align-items: center; }
.footer-brand { font-size: 26px; color: var(--blue); letter-spacing: -.7px; line-height: 1.3; text-decoration: none; }
.footer-brand b { font-weight: 700; }
.footer-brand span { color: var(--teal); font-size: .8em; }
.footer p { margin: 6px 0 0; font-size: 13px; }
.footer-meta { text-align: right; font-size: 12px; }
.footer-meta p { font-size: 12px; margin-bottom: 5px; }
.footer-meta a + a { margin-left: 16px; }
.footer-art { margin-top: 24px; padding-top: 24px; border-top: 1px solid var(--line); }
.footer-art img { width: auto; max-width: min(100%, 500px); max-height: 180px; object-fit: contain; margin-inline: auto; }
.site-notice { margin-top: 24px; padding-block: 15px 3px; border-top: 1px solid var(--line); border-bottom: 0; }
.site-notice summary { font-size: 12px; font-weight: 400; }
.site-notice summary::after { font-size: 20px; }
.notice-copy { padding-top: 6px; max-width: 940px; }
.notice-copy p { font-size: 12px; margin: 12px 0 0; line-height: 1.8; }
.notice-copy strong { color: var(--ink); }
.notice-copy .notice-date { margin-top: 16px; }

@media (min-width: 1500px) {
  .hero-grid { padding-block: 82px; }
}
@media (max-width: 1050px) {
  .wrap { width: calc(100% - 48px); }
  .hero-grid { gap: 35px; }
  .hero h1 { font-size: 48px; }
  .case-panel { padding: 24px; }
  .hero .eyebrow { font-size: 10px; }
  .hero-actions { gap: 18px; }
  .steps { gap: 22px; }
  .evidence-grid, .development-grid, .faq-grid, .contact-grid { gap: 45px; }
  .principles p { font-size: 12px; gap: 8px; }
  .step h3 { font-size: 19px; }
  .contact h2 { font-size: 28px; }
}
@media (max-width: 800px) {
  .brand-row { min-height: 104px; grid-template-columns: minmax(0, 1fr) minmax(0, 2fr) minmax(0, 1fr); gap: 12px; }
  .wordmark { font-size: 36px; }
  .header-link { font-size: 12px; gap: 6px; }
  .hero-grid { grid-template-columns: 1fr; gap: 40px; padding-block: 48px; }
  .hero-copy { max-width: 650px; }
  .hero h1 { font-size: clamp(42px, 7vw, 58px); max-width: 620px; }
  .hero .eyebrow { font-size: 11px; }
  .lead { max-width: 620px; }
  .case-panel { width: 100%; max-width: 620px; }
  .outline-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 24px; }
  .panel-note br { display: none; }
  .principles .wrap { gap: 10px; }
  .principles p { flex-direction: column; gap: 3px; text-align: center; }
  .section { padding-block: 56px; }
  .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 30px; }
  .evidence-grid, .development-grid, .faq-grid, .contact-grid { grid-template-columns: 1fr; gap: 34px; }
  .evidence .section-heading { max-width: 640px; }
  .use-cases { gap: 22px; }
  .basis-note { grid-template-columns: 1fr; gap: 12px; }
  .basis-note p { font-size: 22px; }
  .development-detail { border-left: 0; border-top: 1px solid #405470; padding: 28px 0 0; }
  .legal-contact { border-left: 0; border-top: 1px solid #cbd9e6; padding: 28px 0 0; }
  .contact h2 { font-size: 32px; }
  .footer-line { align-items: flex-start; }
  .footer-meta a { display: block; }
  .footer-meta a + a { margin: 7px 0 0; }
}
@media (max-width: 540px) {
  .wrap { width: calc(100% - 36px); }
  .utility p { font-size: 11px; }
  .utility strong { display: block; margin-left: 0; }
  .brand-row { min-height: 100px; grid-template-columns: minmax(0, 1fr) auto; padding-block: 15px; gap: 16px; }
  .icon-slot { display: none; }
  .brand { justify-self: start; width: auto; min-height: 54px; }
  .wordmark { font-size: 32px; letter-spacing: -1.3px; }
  .wordmark::after { margin-left: 0; width: 32px; }
  .brand img { max-width: 210px; max-height: 70px; }
  .header-link { font-size: 11px; gap: 6px; }
  .nav .wrap { justify-content: space-between; gap: 12px; padding-block: 12px; }
  .nav a { font-size: 11px; }
  .hero-grid { padding-block: 40px; gap: 32px; }
  .hero h1 { font-size: 42px; letter-spacing: -1.6px; }
  .hero .eyebrow { font-size: 9px; letter-spacing: .09em; }
  .lead { font-size: 17px; line-height: 1.75; }
  .hero-actions { gap: 18px 20px; }
  .hero-actions .text-link { font-size: 14px; }
  .hero-note { font-size: 12px; }
  .case-panel { padding: 23px 21px; }
  .case-panel h2 { font-size: 27px; }
  .panel-top { gap: 10px; }
  .panel-label { font-size: 9px; }
  .outline-list { display: block; }
  .outline-list li { padding-block: 15px; }
  .outline-list p { font-size: 13px; }
  .panel-note { font-size: 11px; }
  .principles .wrap { padding-block: 18px; gap: 0; }
  .principles p { padding-inline: 8px; font-size: 10px; line-height: 1.55; }
  .principles span { font-size: 10px; }
  .section { padding-block: 46px; }
  .section-heading { margin-bottom: 30px; }
  .section-heading h2 { font-size: 32px; letter-spacing: -.9px; }
  .section-heading > p:not(.eyebrow) { font-size: 16px; }
  .section-heading .small-note { font-size: 12px; }
  .steps, .use-cases { grid-template-columns: 1fr; gap: 26px; }
  .step { padding-top: 17px; }
  .step-number { margin-bottom: 9px; }
  .step h3 { font-size: 20px; }
  .section-note { font-size: 12px; margin-top: 26px; }
  .evidence-list li { grid-template-columns: 48px minmax(0, 1fr); gap: 16px; padding-block: 20px; }
  .material-tag { width: 46px; height: 48px; font-size: 18px; }
  .evidence-list h3 { font-size: 17px; }
  .evidence-list p { font-size: 13px; }
  .basis-note { margin-top: 32px; padding-top: 25px; }
  .basis-note p { font-size: 20px; }
  summary { font-size: 16px; gap: 16px; }
  details p { margin-right: 0; font-size: 14px; }
  .contact { padding-block: 40px; }
  .contact h2 { font-size: 29px; }
  .contact-email { font-size: 22px; }
  .contact p { font-size: 15px; }
  .contact .contact-note { font-size: 12px; }
  .legal-contact p { font-size: 14px; }
  .footer-line { display: block; }
  .footer-meta { text-align: left; margin-top: 22px; }
  .footer-meta a { display: inline-block; }
  .footer-meta a + a { margin: 0 0 0 16px; }
  .site-notice { margin-top: 20px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}