/* ============================================================
   Kafeido platform homepage — design system
   Visual language mirrors the 2026 pitch deck:
   mono eyebrow labels, cyan accent, navy ink, bordered cards.
   Layered on top of Bootstrap 5 (grid only).
   ============================================================ */

:root {
  --k-ink: #0b1020;
  --k-ink-soft: #1c2436;
  --k-muted: #5b6472;
  --k-cyan: #0aaedc;
  --k-cyan-dark: #0890b6;
  --k-tint: #e9f7fc;
  --k-tint-line: #bfe8f4;
  --k-line: #e4e9f0;
  --k-bg: #ffffff;
  --k-bg-soft: #f6f9fb;
  --k-navy: #070037;
  --k-radius: 14px;
  --k-mono: "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --k-sans: "Roboto", system-ui, -apple-system, "Segoe UI", sans-serif;
}

body.k-page {
  font-family: var(--k-sans);
  color: var(--k-ink);
  background: var(--k-bg);
  -webkit-font-smoothing: antialiased;
  line-height: 1.6;
}

.k-page section { scroll-margin-top: 90px; }

/* ---------- Typography ---------- */
.k-eyebrow {
  font-family: var(--k-mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--k-cyan);
  margin-bottom: 0.75rem;
  display: block;
}
.k-h1 {
  font-size: clamp(2.4rem, 5vw, 4rem);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin-bottom: 1.25rem;
}
.k-h2 {
  font-size: clamp(1.9rem, 3.4vw, 2.9rem);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
}
.k-accent { color: var(--k-cyan); }
.k-lead {
  font-size: clamp(1.05rem, 1.6vw, 1.3rem);
  color: var(--k-muted);
  max-width: 60ch;
}
.k-section { padding: 84px 0; }
.k-section--soft { background: var(--k-bg-soft); }
.k-section--ink { background: var(--k-ink); color: #fff; }
.k-section--ink .k-lead { color: #aeb6c4; }

/* ---------- Patented pill badge ---------- */
.k-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--k-mono);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--k-cyan-dark);
  border: 1px solid var(--k-tint-line);
  background: var(--k-tint);
  border-radius: 999px;
  padding: 0.45rem 1rem;
}
.k-pill::before {
  content: "";
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--k-cyan);
}

/* ---------- Buttons ---------- */
.k-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
  border-radius: 999px;
  padding: 0.8rem 1.6rem;
  text-decoration: none;
  transition: all 0.2s ease;
  border: 1px solid transparent;
  cursor: pointer;
}
.k-btn--primary { background: var(--k-cyan); color: #fff; }
.k-btn--primary:hover { background: var(--k-cyan-dark); color: #fff; transform: translateY(-1px); }
.k-btn--ghost { background: transparent; color: var(--k-ink); border-color: var(--k-line); }
.k-btn--ghost:hover { border-color: var(--k-cyan); color: var(--k-cyan-dark); }
.k-section--ink .k-btn--ghost { color: #fff; border-color: rgba(255,255,255,0.25); }
.k-section--ink .k-btn--ghost:hover { border-color: var(--k-cyan); color: var(--k-cyan); }

/* ---------- Navbar ---------- */
.k-nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--k-line);
}
.k-nav .navbar-brand { font-weight: 800; color: var(--k-ink); display: flex; align-items: center; gap: 0.5rem; }
.k-nav .navbar-brand img { height: 28px; }
.k-nav .nav-link { color: var(--k-ink-soft); font-weight: 500; font-size: 0.95rem; }
.k-nav .nav-link:hover { color: var(--k-cyan-dark); }
.k-lang-btn {
  background: none; border: 1px solid var(--k-line);
  border-radius: 999px; padding: 0.35rem 0.8rem;
  font-family: var(--k-mono); font-size: 0.8rem; color: var(--k-ink-soft);
  display: inline-flex; align-items: center; gap: 0.4rem; cursor: pointer;
}
.k-lang-menu { border: 1px solid var(--k-line); border-radius: 10px; min-width: 150px; }
.k-lang-menu .dropdown-item { font-size: 0.9rem; padding: 0.5rem 1rem; }
.k-lang-menu .dropdown-item.active { background: var(--k-tint); color: var(--k-cyan-dark); font-weight: 600; }

/* ---------- Hero ---------- */
.k-hero { padding: 96px 0 72px; position: relative; overflow: hidden; }
.k-hero__rings {
  position: absolute; right: -120px; top: 50%; transform: translateY(-50%);
  width: 620px; height: 620px; pointer-events: none; opacity: 0.5;
}
.k-hero__rings span {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%,-50%);
  border: 1px solid var(--k-tint-line); border-radius: 50%;
}
.k-hero__rings span:nth-child(1) { width: 620px; height: 620px; }
.k-hero__rings span:nth-child(2) { width: 440px; height: 440px; }
.k-hero__rings span:nth-child(3) { width: 260px; height: 260px; }
.k-hero__rings span:nth-child(4) { width: 120px; height: 120px; background: var(--k-tint); }
.k-meta-row { display: flex; flex-wrap: wrap; gap: 2.5rem; margin-top: 2rem; }
.k-meta__label { font-family: var(--k-mono); font-size: 0.7rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--k-muted); }
.k-meta__value { font-weight: 700; }

/* ---------- Cards ---------- */
.k-card {
  background: #fff;
  border: 1px solid var(--k-line);
  border-radius: var(--k-radius);
  padding: 1.75rem;
  height: 100%;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}
.k-card--link { display: block; text-decoration: none; color: inherit; }
.k-card--link:hover { border-color: var(--k-cyan); box-shadow: 0 12px 30px rgba(10,174,220,0.10); transform: translateY(-3px); }
.k-card--tint { background: var(--k-tint); border-color: var(--k-tint-line); }
.k-card__idx { font-family: var(--k-mono); font-size: 0.78rem; color: var(--k-cyan); letter-spacing: 0.08em; }
.k-card__title { font-weight: 800; font-size: 1.2rem; margin: 0.5rem 0 0.4rem; }
.k-card__sub { color: var(--k-cyan-dark); font-weight: 600; font-size: 0.92rem; margin-bottom: 0.6rem; }
.k-card__body { color: var(--k-muted); font-size: 0.97rem; margin: 0; }
.k-card__more { font-family: var(--k-mono); font-size: 0.78rem; color: var(--k-cyan-dark); margin-top: 1rem; display: inline-flex; gap: 0.35rem; }

/* ---------- Architecture stack ---------- */
.k-stack { display: flex; flex-direction: column; gap: 14px; }
.k-layer {
  display: grid;
  grid-template-columns: 160px 1fr auto;
  gap: 1.5rem;
  align-items: center;
  border: 1px solid var(--k-line);
  border-radius: var(--k-radius);
  padding: 1.4rem 1.75rem;
  background: #fff;
  text-decoration: none;
  color: inherit;
  transition: all 0.2s ease;
}
.k-layer:hover { border-color: var(--k-cyan); box-shadow: 0 10px 26px rgba(10,174,220,0.10); }
.k-layer--hl { background: var(--k-tint); border-color: var(--k-tint-line); }
.k-layer__tag { font-family: var(--k-mono); font-size: 0.82rem; color: var(--k-cyan-dark); font-weight: 600; letter-spacing: 0.04em; }
.k-layer__title { font-weight: 800; font-size: 1.15rem; }
.k-layer__desc { color: var(--k-muted); font-size: 0.95rem; }
.k-layer__tech { font-family: var(--k-mono); font-size: 0.8rem; color: var(--k-ink-soft); text-align: right; }
.k-layer__ext { font-family: var(--k-mono); font-size: 0.72rem; color: var(--k-cyan-dark); }
@media (max-width: 768px) {
  .k-layer { grid-template-columns: 1fr; gap: 0.5rem; }
  .k-layer__tech { text-align: left; }
}

/* ---------- Chips ---------- */
.k-chips { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 1rem; }
.k-chip {
  font-family: var(--k-mono); font-size: 0.78rem;
  border: 1px solid var(--k-line); border-radius: 8px;
  padding: 0.3rem 0.7rem; color: var(--k-ink-soft); background: #fff;
}

/* ---------- Stat blocks ---------- */
.k-stat__num { font-size: clamp(2rem, 4vw, 2.8rem); font-weight: 900; color: var(--k-cyan); line-height: 1; }
.k-stat__label { color: var(--k-muted); font-size: 0.92rem; margin-top: 0.4rem; }

/* ---------- Timeline ---------- */
.k-timeline { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; counter-reset: step; }
.k-timeline__item { border: 1px solid var(--k-line); border-radius: var(--k-radius); padding: 1.25rem; background: #fff; }
.k-timeline__week { font-family: var(--k-mono); font-size: 0.78rem; color: var(--k-cyan-dark); }
.k-timeline__title { font-weight: 700; margin-top: 0.35rem; }
@media (max-width: 768px) { .k-timeline { grid-template-columns: 1fr 1fr; } }

/* ---------- Credentials band ---------- */
.k-creds { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.25rem; }
.k-cred__label { font-family: var(--k-mono); font-size: 0.72rem; color: var(--k-cyan); letter-spacing: 0.1em; }
.k-cred__title { font-weight: 800; margin-top: 0.3rem; }
.k-cred__body { color: #aeb6c4; font-size: 0.9rem; margin: 0.2rem 0 0; }
@media (max-width: 768px) { .k-creds { grid-template-columns: 1fr; } }

/* ---------- Footer ---------- */
.k-footer { background: var(--k-ink); color: #aeb6c4; padding: 56px 0 28px; }
.k-footer a { color: #cfd6e0; text-decoration: none; }
.k-footer a:hover { color: var(--k-cyan); }
.k-footer h5 { color: #fff; font-size: 0.95rem; font-weight: 700; margin-bottom: 1rem; }
.k-footer__bottom { border-top: 1px solid rgba(255,255,255,0.1); margin-top: 2.5rem; padding-top: 1.5rem; font-size: 0.85rem; }

/* ---------- Language visibility ---------- */
.lang-ja, .lang-zh { display: none; }
[data-lang="ja"] .lang-en, [data-lang="ja"] .lang-zh { display: none; }
[data-lang="ja"] .lang-ja { display: revert; }
[data-lang="zh"] .lang-en, [data-lang="zh"] .lang-ja { display: none; }
[data-lang="zh"] .lang-zh { display: revert; }

/* ---------- Product screenshots ---------- */
.k-shot {
  border: 1px solid var(--k-line);
  border-radius: 12px;
  overflow: hidden;
  background: #fff;
  box-shadow: 0 18px 44px rgba(11, 16, 32, 0.12);
}
.k-shot img { width: 100%; display: block; }
.k-shot__cap {
  font-family: var(--k-mono);
  font-size: 0.76rem;
  color: var(--k-muted);
  padding: 0.6rem 0.9rem;
  border-top: 1px solid var(--k-line);
  display: flex;
  align-items: center;
  gap: 0.45rem;
}
.k-shot__cap i { color: var(--k-cyan); }
/* image pinned to the top of a card */
.k-card__img {
  width: 100%;
  display: block;
  border-radius: 10px;
  border: 1px solid var(--k-line);
  margin-bottom: 1.1rem;
}

/* ---------- Browser-framed screenshot (hero product shot) ---------- */
.k-browser {
  border: 1px solid var(--k-line);
  border-radius: 14px;
  overflow: hidden;
  background: #fff;
  box-shadow: 0 30px 70px rgba(11, 16, 32, 0.20);
}
.k-browser__bar {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.6rem 0.85rem;
  background: var(--k-bg-soft);
  border-bottom: 1px solid var(--k-line);
}
.k-browser__dot { width: 11px; height: 11px; border-radius: 50%; background: #d7dde6; flex: 0 0 auto; }
.k-browser__url {
  margin-left: 0.5rem;
  flex: 1;
  font-family: var(--k-mono);
  font-size: 0.72rem;
  color: var(--k-muted);
  background: #fff;
  border: 1px solid var(--k-line);
  border-radius: 7px;
  padding: 0.28rem 0.7rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.k-browser__url i { color: var(--k-cyan); margin-right: 0.4rem; }
.k-browser img { width: 100%; display: block; }

/* ---------- Content / prose pages (jobs, policy, team) ---------- */
.k-prose { color: var(--k-ink-soft); font-size: 1rem; line-height: 1.7; }
.k-prose h2 { font-weight: 800; font-size: 1.5rem; margin: 2.25rem 0 0.75rem; letter-spacing: -0.01em; }
.k-prose h3 { font-weight: 700; font-size: 1.15rem; margin: 1.6rem 0 0.5rem; }
.k-prose p { color: var(--k-muted); margin-bottom: 1rem; }
.k-prose a { color: var(--k-cyan-dark); }
.k-prose strong { color: var(--k-ink); }
.k-list { color: var(--k-muted); padding-left: 1.15rem; margin-bottom: 1rem; }
.k-list li { margin-bottom: 0.4rem; }
.k-meta-line { font-family: var(--k-mono); font-size: 0.8rem; color: var(--k-muted); }
.k-divider { border: 0; border-top: 1px solid var(--k-line); margin: 1.25rem 0; }

/* ---------- Comparison table ---------- */
.k-table-wrap { overflow-x: auto; }
.k-table { width: 100%; min-width: 640px; border-collapse: separate; border-spacing: 0; border: 1px solid var(--k-line); border-radius: 12px; overflow: hidden; font-size: 0.95rem; background: #fff; }
.k-table th, .k-table td { padding: 0.9rem 1rem; text-align: center; border-bottom: 1px solid var(--k-line); }
.k-table thead th { background: var(--k-ink); color: #fff; font-weight: 600; }
.k-table thead th.k-col-hl { background: var(--k-cyan-dark); }
.k-table tbody td:first-child, .k-table thead th:first-child { text-align: left; font-weight: 600; }
.k-table tbody tr:last-child td { border-bottom: 0; }
.k-table td.k-col-hl { background: var(--k-tint); font-weight: 700; color: var(--k-cyan-dark); }
.k-yes { color: #10b981; font-weight: 800; }
.k-no { color: #c9d0da; font-weight: 800; }

/* ---------- Feature icon ---------- */
.k-feat__icon { font-size: 1.6rem; color: var(--k-cyan); margin-bottom: 0.6rem; }