:root {
  --kail-bg: #080d1d;
  --kail-bg-soft: #10182e;
  --kail-panel: rgba(18, 29, 54, 0.86);
  --kail-panel-solid: #121d36;
  --kail-border: rgba(126, 226, 255, 0.2);
  --kail-text: #f4f8ff;
  --kail-muted: #b8c5d9;
  --kail-cyan: #62daf5;
  --kail-cyan-strong: #00b8df;
  --kail-gold: #e4bd6a;
  --kail-green: #7de0b2;
  --kail-violet: #b8a5ff;
  --kail-orange: #ffc276;
  --kail-danger: #ff9ea8;
  --kail-shadow: 0 20px 60px rgba(0, 0, 0, 0.25);
  --kail-radius: 18px;
  --kail-container: 1180px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--kail-text);
  background:
    radial-gradient(circle at 15% 8%, rgba(0, 184, 223, 0.13), transparent 28rem),
    radial-gradient(circle at 86% 32%, rgba(184, 165, 255, 0.09), transparent 30rem),
    var(--kail-bg);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", "YuGothic", "Noto Sans JP", sans-serif;
  font-size: 16px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; }
a { color: var(--kail-cyan); text-underline-offset: 0.18em; }
a:hover { color: #a8efff; }
button, a { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid var(--kail-gold); outline-offset: 4px; }
[hidden] { display: none !important; }

.kail-skip-link {
  position: fixed;
  z-index: 1000;
  top: 12px;
  left: 12px;
  transform: translateY(-160%);
  padding: 10px 16px;
  color: #06101d;
  background: var(--kail-gold);
  border-radius: 8px;
  font-weight: 800;
}
.kail-skip-link:focus { transform: translateY(0); }
.kail-container { width: min(calc(100% - 40px), var(--kail-container)); margin-inline: auto; }
.kail-narrow { width: min(calc(100% - 40px), 860px); margin-inline: auto; }

.kail-header {
  position: sticky;
  z-index: 100;
  top: 0;
  border-bottom: 1px solid var(--kail-border);
  background: rgba(8, 13, 29, 0.9);
  backdrop-filter: blur(16px);
}
.kail-nav-wrap { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.kail-logo { color: var(--kail-text); text-decoration: none; display: inline-flex; flex-direction: column; line-height: 1.2; }
.kail-logo-main { font-size: 1.14rem; font-weight: 850; letter-spacing: 0.08em; }
.kail-logo-sub { margin-top: 5px; color: var(--kail-cyan); font-size: 0.64rem; letter-spacing: 0.2em; }
.kail-nav { display: flex; align-items: center; gap: 6px; }
.kail-nav a { padding: 8px 9px; color: var(--kail-muted); border-radius: 8px; font-size: 0.82rem; font-weight: 700; text-decoration: none; white-space: nowrap; }
.kail-nav a:hover, .kail-nav a[aria-current="page"] { color: var(--kail-text); background: rgba(98, 218, 245, 0.1); }
.kail-menu-button { display: none; width: 44px; height: 44px; padding: 10px; border: 1px solid var(--kail-border); border-radius: 10px; color: var(--kail-text); background: var(--kail-panel-solid); }
.kail-menu-lines, .kail-menu-lines::before, .kail-menu-lines::after { display: block; width: 22px; height: 2px; background: currentColor; }
.kail-menu-lines { position: relative; }
.kail-menu-lines::before, .kail-menu-lines::after { position: absolute; left: 0; content: ""; }
.kail-menu-lines::before { top: -7px; }
.kail-menu-lines::after { top: 7px; }

.kail-hero {
  position: relative;
  min-height: 640px;
  display: grid;
  align-items: center;
  overflow: hidden;
  border-bottom: 1px solid var(--kail-border);
  background-image: linear-gradient(90deg, rgba(8,13,29,0.98) 0%, rgba(8,13,29,0.86) 55%, rgba(8,13,29,0.58) 100%), url("kai_lab_assets/kai_lab_hero_bg.svg");
  background-position: center;
  background-size: cover;
}
.kail-hero::after {
  position: absolute; inset: auto 0 0; height: 180px; content: "";
  background: linear-gradient(transparent, var(--kail-bg)); pointer-events: none;
}
.kail-hero-content { position: relative; z-index: 1; padding-block: 100px 130px; }
.kail-eyebrow { display: inline-flex; align-items: center; gap: 9px; color: var(--kail-cyan); font-size: 0.75rem; font-weight: 850; letter-spacing: 0.17em; text-transform: uppercase; }
.kail-eyebrow::before { width: 28px; height: 1px; content: ""; background: currentColor; }
.kail-hero h1, .kail-page-hero h1 { margin: 18px 0 22px; max-width: 880px; font-size: clamp(2.5rem, 7vw, 5.5rem); line-height: 1.12; letter-spacing: -0.045em; }
.kail-hero-lead { max-width: 780px; color: #d6e1f2; font-size: clamp(1rem, 2vw, 1.22rem); line-height: 1.9; }
.kail-hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.kail-button { display: inline-flex; min-height: 48px; align-items: center; justify-content: center; padding: 10px 20px; border: 1px solid var(--kail-border); border-radius: 999px; color: var(--kail-text); background: rgba(18,29,54,0.76); font-weight: 800; text-decoration: none; }
.kail-button:hover { color: #06101d; background: var(--kail-cyan); border-color: var(--kail-cyan); }
.kail-button-primary { color: #06101d; background: var(--kail-cyan); border-color: var(--kail-cyan); }
.kail-button-primary:hover { background: #a8efff; }

.kail-page-hero { padding: 82px 0 62px; border-bottom: 1px solid var(--kail-border); background: linear-gradient(135deg, rgba(20,38,69,0.92), rgba(8,13,29,0.78)); }
.kail-page-hero h1 { font-size: clamp(2.25rem, 6vw, 4.7rem); }
.kail-page-lead { max-width: 800px; margin: 0; color: var(--kail-muted); font-size: 1.08rem; }
.kail-breadcrumb { padding: 18px 0 0; font-size: 0.83rem; color: var(--kail-muted); }
.kail-breadcrumb ol { display: flex; flex-wrap: wrap; gap: 7px; margin: 0; padding: 0; list-style: none; }
.kail-breadcrumb li:not(:last-child)::after { margin-left: 7px; content: "/"; color: #71819b; }

.kail-section { padding-block: 84px; }
.kail-section-compact { padding-block: 58px; }
.kail-section-alt { border-block: 1px solid var(--kail-border); background: rgba(16, 24, 46, 0.54); }
.kail-section-head { max-width: 760px; margin-bottom: 34px; }
.kail-section-head h2 { margin: 8px 0 12px; font-size: clamp(1.8rem, 4vw, 3rem); line-height: 1.28; letter-spacing: -0.03em; }
.kail-section-head p { margin: 0; color: var(--kail-muted); }
.kail-space-top { margin-top: 20px; }
.kail-kicker { color: var(--kail-gold); font-size: 0.72rem; font-weight: 850; letter-spacing: 0.16em; text-transform: uppercase; }
.kail-prose h2 { margin-top: 2.2em; line-height: 1.4; }
.kail-prose h3 { margin-top: 1.8em; }
.kail-prose p, .kail-prose li { color: #d3deed; }
.kail-prose strong { color: var(--kail-text); }
.kail-prose a { overflow-wrap: anywhere; }

.kail-home-about-head { max-width: 900px; margin-bottom: 22px; }
.kail-home-about-intro { max-width: 900px; font-size: 1.05rem; }
.kail-home-about-intro p { margin: 0; }
.kail-home-about-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 28px; margin-top: 42px; }
.kail-home-about-block { padding-top: 22px; border-top: 2px solid rgba(228, 189, 106, 0.62); }
.kail-home-about-block h3 { margin: 0 0 12px; font-size: 1.08rem; line-height: 1.5; }
.kail-home-about-block p { margin: 0; color: var(--kail-muted); font-size: 0.94rem; line-height: 1.9; }
.kail-home-about-responsibility { max-width: 980px; margin-top: 42px; }
.kail-home-about-responsibility p + p { margin-top: 14px; }
.kail-home-about-guide { max-width: 900px; margin-top: 36px; }
.kail-home-about-guide p { margin: 0; }

.kail-toc-section { border-bottom: 1px solid var(--kail-border); background: rgba(16, 24, 46, 0.35); }
.kail-toc { padding: 24px; border: 1px solid var(--kail-border); border-radius: 16px; background: rgba(18, 29, 54, 0.62); }
.kail-toc ol { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px 28px; margin: 0; padding-left: 1.35rem; }
.kail-toc li { color: var(--kail-gold); }
.kail-toc a { color: var(--kail-muted); text-decoration-thickness: 1px; }
.kail-toc a:hover { color: var(--kail-text); }
.kail-detail-anchor { scroll-margin-top: 96px; }
.kail-detail-section .kail-section-head { max-width: 860px; }
.kail-detail-section .kail-section-head h2 { font-size: clamp(1.7rem, 3.4vw, 2.55rem); }

.kail-grid { display: grid; gap: 20px; }
.kail-grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.kail-grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.kail-grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.kail-card { position: relative; padding: 26px; border: 1px solid var(--kail-border); border-radius: var(--kail-radius); background: var(--kail-panel); box-shadow: var(--kail-shadow); }
.kail-card h2, .kail-card h3 { margin: 12px 0 10px; line-height: 1.45; }
.kail-card p { margin: 0; color: var(--kail-muted); }
.kail-card-link { display: inline-flex; margin-top: 18px; font-weight: 800; text-decoration: none; }
.kail-card-number { color: var(--kail-cyan); font-size: 0.72rem; font-weight: 900; letter-spacing: 0.14em; }
.kail-card:hover { border-color: rgba(98,218,245,0.44); transform: translateY(-2px); transition: transform 160ms ease, border-color 160ms ease; }

.kail-status { display: inline-flex; align-items: center; gap: 7px; padding: 5px 10px; border: 1px solid currentColor; border-radius: 999px; font-size: 0.72rem; font-weight: 850; letter-spacing: 0.03em; }
.kail-status::before { width: 7px; height: 7px; border-radius: 50%; content: ""; background: currentColor; }
.kail-status-done { color: var(--kail-green); }
.kail-status-trial { color: var(--kail-cyan); }
.kail-status-concept { color: var(--kail-orange); }
.kail-status-thought { color: var(--kail-violet); }
.kail-status-legend { display: flex; flex-wrap: wrap; gap: 10px; padding: 20px; border: 1px solid var(--kail-border); border-radius: 14px; background: rgba(18,29,54,0.5); }

.kail-project-card { display: flex; min-height: 100%; flex-direction: column; }
.kail-project-card .kail-card-link { margin-top: auto; padding-top: 18px; }
.kail-meta { display: flex; flex-wrap: wrap; gap: 8px 14px; color: #91a3bd; font-size: 0.8rem; }
.kail-tags { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 16px; }
.kail-tag { padding: 4px 9px; border-radius: 999px; color: #c9d5e8; background: rgba(98,218,245,0.08); font-size: 0.72rem; }

.kail-article-card { display: flex; min-height: 100%; flex-direction: column; }
.kail-article-card h2, .kail-article-card h3 { font-size: 1.04rem; }
.kail-article-card .kail-card-link { margin-top: auto; padding-top: 18px; }
.kail-record-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 32px; border-top: 1px solid var(--kail-border); }
.kail-record-card, .kail-feed-card { display: flex; min-width: 0; min-height: 100%; flex-direction: column; padding: 27px 2px; border-bottom: 1px solid var(--kail-border); }
.kail-record-card h3, .kail-feed-card h3 { margin: 10px 0 11px; font-size: 1.08rem; line-height: 1.55; }
.kail-record-card p, .kail-feed-card p { margin: 0; color: var(--kail-muted); font-size: 0.9rem; line-height: 1.8; }
.kail-record-card .kail-card-link, .kail-feed-card .kail-card-link { min-height: 44px; align-items: center; align-self: flex-start; margin-top: auto; padding-top: 14px; }
.kail-record-meta { display: flex; flex-wrap: wrap; gap: 6px 16px; color: #91a3bd; font-size: 0.78rem; }
.kail-record-meta span:first-child { color: var(--kail-cyan); font-weight: 800; }
.kail-record-meta span + span::before, .kail-record-meta time::before { margin-right: 16px; content: "·"; color: #607089; }
.kail-feed-status { margin: 18px 0 0; color: #91a3bd; font-size: 0.8rem; }
.kail-filters { display: flex; flex-wrap: wrap; gap: 9px; margin-bottom: 28px; }
.kail-filter-button { padding: 8px 13px; border: 1px solid var(--kail-border); border-radius: 999px; color: var(--kail-muted); background: rgba(18,29,54,0.8); font: inherit; font-size: 0.82rem; font-weight: 750; cursor: pointer; }
.kail-filter-button:hover, .kail-filter-button[aria-pressed="true"] { color: #06101d; border-color: var(--kail-cyan); background: var(--kail-cyan); }
.kail-filter-summary { min-height: 1.8em; color: var(--kail-muted); font-size: 0.9rem; }

.kail-timeline { position: relative; display: grid; gap: 20px; }
.kail-timeline::before { position: absolute; top: 14px; bottom: 14px; left: 8px; width: 1px; content: ""; background: var(--kail-border); }
.kail-timeline-item { position: relative; padding-left: 38px; }
.kail-timeline-item::before { position: absolute; top: 11px; left: 3px; width: 11px; height: 11px; border: 2px solid var(--kail-bg); border-radius: 50%; content: ""; background: var(--kail-cyan); box-shadow: 0 0 0 3px rgba(98,218,245,0.3); }
.kail-timeline-item time { color: var(--kail-gold); font-size: 0.8rem; font-weight: 850; }
.kail-timeline-item h3 { margin: 4px 0 7px; }
.kail-timeline-item p { margin: 0; color: var(--kail-muted); }

.kail-callout { padding: 24px; border-left: 4px solid var(--kail-cyan); border-radius: 0 14px 14px 0; background: rgba(98,218,245,0.07); }
.kail-callout p { margin: 0; color: #d3deed; }
.kail-note { color: #96a8c0; font-size: 0.88rem; }
.kail-definition-list { display: grid; grid-template-columns: 12rem 1fr; gap: 14px 24px; }
.kail-definition-list dt { color: var(--kail-cyan); font-weight: 850; }
.kail-definition-list dd { margin: 0; color: var(--kail-muted); }

.kail-contact-panel { display: grid; grid-template-columns: 1.3fr 0.7fr; gap: 28px; padding: 36px; border: 1px solid var(--kail-border); border-radius: 24px; background: linear-gradient(135deg, rgba(21,41,72,0.95), rgba(17,25,48,0.94)); }
.kail-contact-panel h2 { margin-top: 0; }
.kail-contact-panel p { color: var(--kail-muted); }

.kail-footer { padding: 54px 0 34px; border-top: 1px solid var(--kail-border); background: #070b18; }
.kail-footer-grid { display: grid; grid-template-columns: 1.2fr 1fr 1fr; gap: 28px; }
.kail-footer h2, .kail-footer h3 { margin-top: 0; font-size: 0.95rem; }
.kail-footer p, .kail-footer a { color: #9eacc1; font-size: 0.85rem; }
.kail-footer-links { display: grid; gap: 7px; }
.kail-footer-bottom { margin-top: 34px; padding-top: 20px; border-top: 1px solid rgba(126,226,255,0.12); color: #74839b; font-size: 0.76rem; }

.kail-note-grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px 32px;
}

.kail-feed-card-text {
  display: grid;
  grid-template-columns: 144px minmax(0, 1fr);
  grid-template-rows: auto auto 1fr auto;
  column-gap: 16px;
  min-width: 0;
  min-height: 100%;
  padding: 20px;
  border: 1px solid var(--kail-border);
  border-radius: var(--kail-radius);
  background: var(--kail-panel);
  transition: border-color 160ms ease;
}
.kail-feed-card-text:hover {
  border-color: rgba(98, 218, 245, 0.44);
}
.kail-feed-card-media {
  grid-row: 1 / span 4;
  width: 144px;
  aspect-ratio: 2 / 1;
  align-self: start;
  overflow: hidden;
  border: 1px solid rgba(126, 226, 255, 0.18);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.035);
}
.kail-feed-card-image {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
}
.kail-feed-card-text .kail-record-meta,
.kail-feed-card-text h3,
.kail-feed-card-text p,
.kail-feed-card-text .kail-card-link { grid-column: 2; }
.kail-feed-card-text h3 {
  margin: 10px 0 11px;
  font-size: 1.08rem;
  line-height: 1.55;
  color: var(--kail-text);
  font-weight: 700;
}
.kail-feed-card-text p {
  margin: 0 0 16px;
  color: var(--kail-muted);
  font-size: 0.9rem;
  line-height: 1.8;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.kail-feed-card-text .kail-card-link {
  margin-top: auto;
  align-self: flex-start;
  font-weight: 800;
  text-decoration: none;
}
.kail-feed-card-no-image { grid-template-columns: minmax(0, 1fr); }
.kail-feed-card-no-image .kail-record-meta,
.kail-feed-card-no-image h3,
.kail-feed-card-no-image p,
.kail-feed-card-no-image .kail-card-link { grid-column: 1; }

@media (max-width: 1020px) {
  .kail-home-about-grid { grid-template-columns: 1fr; gap: 24px; }
  .kail-grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .kail-grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .kail-menu-button { display: inline-grid; place-items: center; }
  .kail-nav { position: absolute; top: calc(100% + 1px); right: 20px; left: 20px; display: none; max-height: calc(100vh - 100px); padding: 14px; overflow-y: auto; border: 1px solid var(--kail-border); border-radius: 14px; background: #0d1529; box-shadow: var(--kail-shadow); }
  .kail-nav[data-open="true"] { display: grid; }
  .kail-nav a { padding: 11px 12px; font-size: 0.92rem; }
}

@media (max-width: 720px) {
  body { font-size: 15px; }
  .kail-container, .kail-narrow { width: min(calc(100% - 28px), var(--kail-container)); }
  .kail-hero { min-height: 580px; background-position: 62% center; }
  .kail-hero-content { padding-block: 74px 110px; }
  .kail-hero h1 { font-size: clamp(2.5rem, 13vw, 4.3rem); }
  .kail-hero-lead br { display: none; }
  .kail-page-hero { padding: 56px 0 46px; }
  .kail-section { padding-block: 62px; }
  .kail-section-compact { padding-block: 44px; }
  .kail-grid-2, .kail-grid-3, .kail-grid-4, .kail-note-grid-2 { grid-template-columns: 1fr; }
  .kail-record-list { grid-template-columns: 1fr; gap: 0; }
  .kail-card { padding: 22px; }
  .kail-definition-list { grid-template-columns: 1fr; gap: 5px 0; }
  .kail-definition-list dd { margin-bottom: 14px; }
  .kail-contact-panel { grid-template-columns: 1fr; padding: 24px; }
  .kail-footer-grid { grid-template-columns: 1fr; }
  .kail-home-about-grid { margin-top: 32px; }
  .kail-home-about-responsibility { margin-top: 32px; }
  .kail-home-about-guide { margin-top: 30px; }
  .kail-toc { padding: 20px; }
  .kail-toc ol { grid-template-columns: 1fr; gap: 8px; }
  .kail-feed-card-text { grid-template-columns: 120px minmax(0, 1fr); column-gap: 12px; padding: 16px; }
  .kail-feed-card-media { width: 120px; }
  .kail-feed-card-text h3 { margin-top: 7px; font-size: 1rem; }
  .kail-feed-card-text p { margin-bottom: 13px; line-height: 1.7; }
  .kail-feed-card-no-image { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 380px) {
  .kail-feed-card-text { grid-template-columns: 112px minmax(0, 1fr); column-gap: 10px; padding: 14px; }
  .kail-feed-card-media { width: 112px; }
  .kail-feed-card-no-image { grid-template-columns: minmax(0, 1fr); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}