/* khub.ai: one stylesheet for every page, English and Traditional Chinese.
   The look follows the earlier khub.ai site: a black top bar, a navy hero with an orange kicker line,
   Montserrat type, white sections with gray bands, and a black footer. */

:root {
  --navy: #091f30;
  --orange: #e47a1d;
  --orange-hover: #f58220;
  --ink: #303030;
  --muted: #5f6b6c;
  --band: #f6f6f6;
  --line: #e2e2e2;
  --link: #1a6fb5;
  --black: #000;
  --white: #fff;
  --wrap: 980px;
  --radius: 10px;
}

* { box-sizing: border-box; }

html { scroll-padding-top: 80px; }

body {
  margin: 0;
  background: var(--white);
  color: var(--ink);
  font: 400 17px/1.8 Montserrat, "Noto Sans TC", "Microsoft JhengHei", "PingFang TC", sans-serif;
}

body.lang-zh {
  font-family: "Noto Sans TC", "Microsoft JhengHei", "PingFang TC", Montserrat, sans-serif;
  line-height: 1.9;
}

img, video { max-width: 100%; height: auto; display: block; }

a { color: var(--link); text-underline-offset: 3px; }
a:hover { color: var(--orange); }

.skip { position: absolute; left: -9999px; }
.skip:focus { left: 16px; top: 8px; z-index: 100; background: var(--white); padding: 6px 12px; }

/* ---------- top bar ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 28px;
  background: var(--black);
}
.brand img { width: 120px; }
.topbar nav { display: flex; align-items: center; flex-wrap: wrap; justify-content: flex-end; gap: 4px 22px; }
.topbar nav a {
  color: var(--white);
  font-size: 13px;
  letter-spacing: 2px;
  text-transform: uppercase;
  text-decoration: none;
  padding: 6px 0;
}
.lang-zh .topbar nav a { font-size: 15px; letter-spacing: 1px; }
.topbar nav a:hover, .topbar nav a[aria-current="page"] { color: var(--orange-hover); }
.topbar nav a.lang {
  border: 1px solid var(--orange);
  border-radius: 999px;
  padding: 4px 14px;
  letter-spacing: 1px;
  text-transform: none;
}
.topbar nav a.lang:hover { background: var(--orange); color: var(--white); }

/* ---------- hero ---------- */
.hero {
  background: var(--navy);
  color: var(--white);
  text-align: center;
  padding: 64px 24px 72px;
}
.kicker {
  margin: 0 0 18px;
  color: var(--orange);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 3px;
  text-transform: uppercase;
}
.lang-zh .kicker { letter-spacing: 4px; }
.hero h1 {
  margin: 0 auto;
  max-width: 900px;
  font-size: clamp(30px, 4.6vw, 52px);
  font-weight: 500;
  line-height: 1.25;
  letter-spacing: 1px;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, .45);
}
.hero-sub {
  margin: 22px auto 0;
  max-width: 760px;
  font-size: clamp(17px, 2vw, 21px);
  color: #dfe7ec;
}
.hero-actions { margin: 34px 0 0; display: flex; justify-content: center; flex-wrap: wrap; gap: 14px; }

.btn {
  display: inline-block;
  padding: 11px 26px;
  border-radius: 999px;
  background: var(--orange);
  color: var(--white);
  font-weight: 600;
  letter-spacing: 1px;
  text-decoration: none;
  border: 2px solid var(--orange);
}
.btn:hover { background: var(--orange-hover); border-color: var(--orange-hover); color: var(--white); }
.btn-ghost { background: transparent; border-color: rgba(255, 255, 255, .7); }
.btn-ghost:hover { background: rgba(255, 255, 255, .12); border-color: var(--white); }

/* ---------- sections ---------- */
.wrap { max-width: var(--wrap); margin: 0 auto; padding: 56px 24px; }
.band { background: var(--band); }
.band > .wrap { padding-top: 52px; padding-bottom: 52px; }

h2 { font-size: clamp(25px, 3vw, 32px); font-weight: 500; line-height: 1.3; margin: 0 0 20px; color: var(--ink); }
h3 { font-size: 19px; font-weight: 600; line-height: 1.4; margin: 0 0 10px; }
p { margin: 0 0 18px; }
.lead { font-size: 20px; color: var(--ink); }
.muted { color: var(--muted); font-size: 15px; }

.note-band { background: #fdf3e9; border-top: 3px solid var(--orange); }
.note-band p { margin: 0; }

.callout {
  background: #fdf3e9;
  border-left: 4px solid var(--orange);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 14px 18px;
  margin-bottom: 36px;
}

.more { font-weight: 600; text-decoration: none; }
.more::after { content: " \2192"; }

/* picture + text rows */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 44px; align-items: center; }
.split.reverse > figure { order: 2; }
.split figure, figure.wide { margin: 0; }
.split img { border-radius: var(--radius); box-shadow: 0 6px 24px rgba(0, 0, 0, .12); }
figure.wide { margin: 8px 0 28px; }
figure.wide img { border-radius: var(--radius); border: 1px solid var(--line); }
figcaption { font-size: 14px; color: var(--muted); margin-top: 10px; text-align: center; }

/* cards */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 20px; margin: 8px 0 22px; }
.card {
  background: var(--white);
  border: 1px solid var(--line);
  border-top: 3px solid var(--orange);
  border-radius: var(--radius);
  padding: 22px 22px 8px;
}
.band .card { box-shadow: 0 2px 10px rgba(0, 0, 0, .04); }
.card p { font-size: 16px; }

/* videos */
.videos { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin: 10px 0 30px; }
.videos figure { margin: 0; }
.videos video { width: 100%; border-radius: var(--radius); background: var(--black); aspect-ratio: 4 / 3; }

/* tables */
.table-wrap { overflow-x: auto; margin: 8px 0 26px; }
table { width: 100%; border-collapse: collapse; background: var(--white); font-size: 15.5px; line-height: 1.6; }
th { background: var(--navy); color: var(--white); text-align: left; font-weight: 600; padding: 10px 14px; }
td { padding: 12px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
td:first-child { width: 24%; }

/* steps and contact */
ol.steps { padding-left: 22px; margin: 0 0 28px; }
ol.steps li { margin: 8px 0; }
.contact-card {
  display: inline-block;
  background: var(--navy);
  color: var(--white);
  border-radius: var(--radius);
  padding: 22px 30px 6px;
}
.contact-card a { color: #ffd2a8; }
.kicker-dark { color: var(--orange); font-weight: 600; letter-spacing: 2px; text-transform: uppercase; font-size: 14px; margin-bottom: 8px; }

/* call to action band */
.cta { background: var(--navy); color: var(--white); text-align: center; }
.cta h2 { color: var(--white); }
.cta p { max-width: 720px; margin-left: auto; margin-right: auto; color: #dfe7ec; }

/* ---------- footer ---------- */
.site-footer {
  background: var(--black);
  color: #cfcfcf;
  text-align: center;
  font-size: 13px;
  letter-spacing: 1.5px;
  padding: 26px 20px 12px;
}
.site-footer p { margin: 0 0 10px; }

/* ---------- small screens ---------- */
@media (max-width: 760px) {
  body { font-size: 16px; }
  .topbar { flex-direction: column; align-items: flex-start; padding: 10px 16px; gap: 6px; }
  .topbar nav { justify-content: flex-start; gap: 2px 16px; }
  .topbar nav a { font-size: 12px; letter-spacing: 1px; }
  .lang-zh .topbar nav a { font-size: 14px; }
  .hero { padding: 44px 16px 52px; }
  .wrap { padding: 40px 16px; }
  .split, .videos { grid-template-columns: 1fr; gap: 24px; }
  .split.reverse > figure { order: 0; }
  td:first-child { width: auto; }
}

.cards.cols-2 { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 760px) { .cards.cols-2 { grid-template-columns: 1fr; } }
@media (max-width: 760px) { .topbar { position: static; } html { scroll-padding-top: 0; } }