/* REDIS Intelligent — site styles
   Brand system per the official Corporate Identity System (CIS):
   Tech Blue (Pantone 287 C) is the primary colour; Speed of Light (Pantone
   1375 C) is the accent. Display type Exo 2, body Noto Sans TC (思源黑體). */

:root {
  /* ===== Brand — Tech Blue (primary), Pantone 287 C ===== */
  --blue: #104098;          /* Tech Blue — C95 M80 Y70 K0 · R16 G64 B152 */
  --blue-700: #154481;      /* CIS blue shade — hover / darker */
  --blue-deep: #103770;     /* CIS deepest blue — footer / deep panels */
  --blue-400: #2660ad;      /* CIS lighter blue — gradient highlight */
  --blue-tint: #eef2fb;     /* soft blue wash */
  /* ===== Brand — Speed of Light (accent), Pantone 1375 C ===== */
  --orange: #f4a12c;        /* Speed of Light — C0 M45 Y85 K0 · R244 G161 B44 */
  --orange-600: #f0831e;    /* CIS deep orange — hover */
  --orange-300: #fac03d;    /* CIS light orange */
  --orange-soft: #fdf1de;   /* soft orange tint */
  /* neutrals (cool, to sit with Tech Blue) */
  --ink: #1b2436;
  --slate: #566074;
  --line: #e3e9f2;
  --line-cool: #d9e0ec;
  --bg: #ffffff;
  --bg-soft: #f4f7fc;
  --bg-panel: #e9f0fa;
  --white: #ffffff;
  /* system */
  --radius: 14px;
  --radius-sm: 9px;
  --shadow: 0 10px 30px rgba(14, 58, 140, 0.10);
  --shadow-sm: 0 4px 14px rgba(14, 58, 140, 0.08);
  --wrap: 1120px;
  --font-display: "Exo 2", "Segoe UI", system-ui, sans-serif;
  --font-body: "Noto Sans TC", "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; font-family: var(--font-body); color: var(--ink);
  background: var(--bg); line-height: 1.65; -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3 { font-family: var(--font-display); color: var(--blue); line-height: 1.15; letter-spacing: -0.01em; font-weight: 600; }
h1 { font-size: clamp(2rem, 4vw, 3rem); margin: 0 0 .5rem; font-weight: 700; }
h2 { font-size: clamp(1.4rem, 2.4vw, 1.9rem); }
h3 { font-size: 1.15rem; margin: 0 0 .4rem; }
p { margin: 0 0 1rem; }
.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 1.25rem; }
.section { padding: 3rem 0; }
.muted { color: var(--slate); }
.small { font-size: .85rem; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 1rem; top: 1rem; background: var(--blue); color: #fff; padding: .5rem .9rem; border-radius: 8px; z-index: 100; }

/* ---- Header ---- */
.site-header { position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,.94);
  backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.site-header__inner { display: flex; align-items: center; justify-content: space-between; min-height: 82px; gap: 1rem; }
.brand { display: inline-flex; align-items: center; gap: .5rem; color: var(--blue); }
.brand:hover { text-decoration: none; }
.brand__img { height: 62px; width: auto; display: block; }
.mainnav ul { display: flex; gap: .25rem; list-style: none; margin: 0; padding: 0; }
.mainnav a { font-family: var(--font-display); color: var(--ink); padding: .5rem .75rem; border-radius: 8px; font-weight: 500; font-size: .95rem; }
.mainnav a:hover { background: var(--orange-soft); text-decoration: none; color: var(--blue); }
.nav-toggle, .nav-btn { display: none; }

/* ---- Breadcrumb ---- */
.crumbs { padding: .75rem 0 0; }
.crumbs ol { display: flex; flex-wrap: wrap; gap: .4rem; list-style: none; margin: 0; padding: 0; font-size: .85rem; color: var(--slate); }
.crumbs li + li::before { content: "/"; margin-right: .4rem; color: var(--line); }
.crumbs a { color: var(--slate); }
.crumbs [aria-current] { color: var(--blue); font-weight: 600; }

/* ---- Hero (Tech Blue, white text — Speed-of-Light accents) ---- */
.hero { position: relative; background:
    repeating-linear-gradient(0deg, rgba(255,255,255,.05) 0 1px, transparent 1px 8px),
    radial-gradient(1100px 460px at 84% -10%, rgba(244,161,44,.22), transparent 60%),
    linear-gradient(155deg, var(--blue-400), var(--blue) 52%, var(--blue-deep));
  color: #eaf1ff; padding: clamp(3rem, 7vw, 5.5rem) 0; overflow: hidden; }
.hero h1 { color: #fff; max-width: 16ch; }
.hero .lede { font-size: 1.15rem; color: rgba(234,241,255,.85); max-width: 62ch; }
.eyebrow { font-family: var(--font-display); text-transform: uppercase; letter-spacing: .18em; font-size: .78rem;
  font-weight: 600; color: var(--orange); margin: 0 0 1rem; }
.hero .btn--ghost { border-color: rgba(255,255,255,.55); color: #fff; }
.hero .btn--ghost:hover { background: rgba(255,255,255,.12); }
.hero__cta { display: flex; gap: .75rem; flex-wrap: wrap; margin: 1.5rem 0 2.25rem; }
.hero__stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; margin: 0;
  border-top: 1px solid rgba(255,255,255,.22); padding-top: 1.5rem; }
.hero__stats dt { font-family: var(--font-display); font-size: .75rem; text-transform: uppercase; letter-spacing: .08em; color: rgba(234,241,255,.7); }
.hero__stats dd { margin: .2rem 0 0; font-family: var(--font-display); font-weight: 600; font-size: 1.05rem; color: #fff; }

/* ---- Buttons ---- */
.btn { display: inline-block; font-family: var(--font-display); padding: .7rem 1.35rem; border-radius: 999px;
  font-weight: 600; font-size: .95rem; letter-spacing: .01em; border: 2px solid transparent; cursor: pointer;
  transition: transform .08s ease, background .15s ease, color .15s ease; }
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn--primary { background: var(--blue); color: #fff; }
.btn--primary:hover { background: var(--blue-700); color: #fff; }
.btn--accent { background: var(--orange); color: var(--blue-deep); }
.btn--accent:hover { background: var(--orange-600); }
.btn--ghost { border-color: rgba(9,42,102,.45); color: var(--blue-deep); }
.btn--ghost:hover { background: rgba(9,42,102,.08); }
.btn--block { display: block; text-align: center; width: 100%; }

/* ---- Page head ---- */
.pagehead { background: var(--bg-soft); border-bottom: 1px solid var(--line); padding: 2.5rem 0; }
.pagehead .lede { font-size: 1.1rem; color: var(--slate); max-width: 70ch; }

/* ---- Answer card (AEO answer-first block) ---- */
.answer-card { background: var(--orange-soft); border: 1px solid #f6dcbc; border-left: 5px solid var(--orange);
  border-radius: var(--radius); padding: 1.5rem 1.75rem; box-shadow: var(--shadow-sm); }
.answer-card h2 { margin-top: 0; }
.answer-card p { margin-bottom: 0; font-size: 1.05rem; }

/* ---- Sections ---- */
.section__title { margin: 0 0 .35rem; }
.section__sub { color: var(--slate); margin: 0 0 1.75rem; max-width: 70ch; }
.lede { font-size: 1.2rem; color: var(--slate); }

/* ---- Grid + cards ---- */
.grid { display: grid; gap: 1.1rem; }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }
.card { display: block; background: var(--white); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1.4rem; box-shadow: var(--shadow-sm); transition: transform .1s ease, box-shadow .15s ease, border-color .15s ease; }
.card:hover { text-decoration: none; transform: translateY(-3px); box-shadow: var(--shadow); border-color: #c3d3f0; }
.card h2, .card h3 { margin-top: 0; }
.card--wide { padding: 1.6rem 1.75rem; }
.card--wide h2 a { color: var(--blue); }
.card__more { display: inline-block; margin-top: .6rem; font-family: var(--font-display); color: var(--blue); font-weight: 600; font-size: .9rem; }
.card:hover .card__more { color: var(--orange-600); }
.card--solution { border-top: 3px solid var(--orange); }
.tag { display: inline-block; font-family: var(--font-display); background: var(--orange-soft); color: var(--blue);
  font-size: .72rem; font-weight: 600; letter-spacing: .04em; text-transform: uppercase; padding: .3rem .6rem;
  border-radius: 999px; margin-bottom: .6rem; }

/* ---- Detail layout ---- */
.detail__grid { display: grid; grid-template-columns: 1fr 320px; gap: 2.5rem; align-items: start; }
.detail__main section { margin-bottom: 2.25rem; }
.detail__main > section > h2 { border-bottom: 1px solid var(--line); padding-bottom: .5rem; }
.detail__side { position: sticky; top: 84px; display: grid; gap: 1.1rem; }

.ticks { list-style: none; margin: 0; padding: 0; display: grid; gap: .55rem; }
.ticks li { position: relative; padding-left: 1.65rem; }
.ticks li::before { content: ""; position: absolute; left: 0; top: .55em; width: .7rem; height: .7rem;
  border-radius: 50%; background: var(--orange); box-shadow: 0 0 0 3px rgba(244,161,44,.25); }
.ticks a { font-weight: 600; }

.deflist { display: grid; gap: 1rem; }
.deflist__row { background: var(--bg-soft); border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 1rem 1.1rem; }
.deflist__row h3 { margin: 0 0 .25rem; color: var(--blue); }
.deflist__row p { margin: 0; color: var(--slate); }

/* ---- Fact box (navy panel) ---- */
.factbox { background: var(--blue); color: #eaf1ff; border-radius: var(--radius); padding: 1.3rem 1.4rem; }
.factbox__title { font-family: var(--font-display); color: #fff; margin: 0 0 .8rem; font-size: 1rem; text-transform: uppercase; letter-spacing: .08em; }
.factbox__grid { margin: 0; display: grid; gap: .7rem; }
.factbox__row { display: grid; gap: .1rem; padding-bottom: .7rem; border-bottom: 1px solid rgba(255,255,255,.14); }
.factbox__row:last-child { border-bottom: 0; padding-bottom: 0; }
.factbox__row dt { font-family: var(--font-display); font-size: .78rem; text-transform: uppercase; letter-spacing: .05em; color: var(--orange); }
.factbox__row dd { margin: 0; font-weight: 500; color: #fff; }

.sidecard { background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.2rem 1.3rem; box-shadow: var(--shadow-sm); }
.sidecard h2 { font-family: var(--font-display); font-size: 1rem; text-transform: uppercase; letter-spacing: .06em; margin: 0 0 .6rem; }
.sidecard .big { font-size: 1.2rem; font-weight: 600; color: var(--blue); margin: 0; }
.sidecard--cta { background: var(--bg-soft); }

/* ---- FAQ ---- */
.faq h2 { margin-bottom: 1rem; }
.faq__item { border: 1px solid var(--line); border-radius: var(--radius-sm); margin-bottom: .7rem; background: var(--white); overflow: hidden; }
.faq__item summary { cursor: pointer; padding: 1rem 1.2rem; font-family: var(--font-display); font-weight: 500; color: var(--blue); list-style: none;
  display: flex; justify-content: space-between; align-items: center; gap: 1rem; }
.faq__item summary::-webkit-details-marker { display: none; }
.faq__item summary::after { content: "+"; color: var(--orange-600); font-size: 1.4rem; font-weight: 400; flex: none; line-height: 1; }
.faq__item[open] summary::after { content: "–"; }
.faq__item[open] summary { border-bottom: 1px solid var(--line); }
.faq__answer { padding: 1rem 1.2rem; color: var(--ink); }
.faq__answer p { margin: 0; }

/* ---- Comparison table ---- */
.table-wrap { overflow-x: auto; margin: 0; border: 1px solid var(--line); border-radius: var(--radius); }
.cmp { border-collapse: collapse; width: 100%; min-width: 640px; font-size: .95rem; }
.cmp caption { text-align: left; font-family: var(--font-display); padding: 1rem 1.1rem; font-weight: 600; color: var(--blue); background: var(--bg-soft); }
.cmp th, .cmp td { padding: .8rem 1.1rem; text-align: left; border-top: 1px solid var(--line); vertical-align: top; }
.cmp thead th { background: var(--blue); color: #fff; border-top: 0; font-size: .85rem; }
.cmp tbody th { background: var(--bg-soft); color: var(--blue); }
.cmp .cmp__hi { background: var(--orange-soft); }
.cmp thead .cmp__hi { background: var(--orange); color: var(--blue-deep); }

/* ---- CTA band (navy) ---- */
.cta-band { background: linear-gradient(120deg, var(--blue), var(--blue-deep)); color: #fff; margin-top: 1rem; }
.cta-band__inner { display: flex; align-items: center; justify-content: space-between; gap: 1.5rem; padding: 2.5rem 0; flex-wrap: wrap; }
.cta-band h2 { color: #fff; margin: 0; max-width: 30ch; }

/* ---- Forms ---- */
.form { display: grid; gap: 1.1rem; max-width: 560px; }
.form__row { display: grid; gap: .35rem; }
.form label { font-family: var(--font-display); font-weight: 500; color: var(--blue); font-size: .9rem; }
.form input, .form select, .form textarea { font: inherit; padding: .7rem .85rem; border: 1px solid var(--line);
  border-radius: var(--radius-sm); background: var(--bg-soft); color: var(--ink); }
.form input:focus, .form select:focus, .form textarea:focus { outline: 2px solid var(--orange); outline-offset: 1px; border-color: transparent; }
address { font-style: normal; line-height: 1.7; }

/* ---- Footer (navy) ---- */
.site-footer { background: var(--blue-deep); color: #c3d2ee; margin-top: 2rem; }
.site-footer__grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1.2fr; gap: 1.5rem; padding: 3rem 0 2rem; }
.site-footer h3 { font-family: var(--font-display); color: #fff; font-size: .85rem; text-transform: uppercase; letter-spacing: .08em; margin: 0 0 .8rem; }
.brand--footer { margin-bottom: .8rem; }
.brand--footer .brand__img { height: 62px; filter: brightness(0) invert(1); }
.footlist { list-style: none; margin: 0; padding: 0; display: grid; gap: .45rem; font-size: .92rem; }
.footlist a { color: #c3d2ee; }
.footlist a:hover { color: var(--orange); }
.site-footer .muted { color: #93a6ca; }
.site-footer__bar { border-top: 1px solid rgba(255,255,255,.12); padding: 1.1rem 0; }

/* ---- Responsive ---- */
@media (max-width: 900px) {
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .detail__grid { grid-template-columns: 1fr; }
  .detail__side { position: static; }
  .site-footer__grid { grid-template-columns: 1fr 1fr; }
  .hero__stats { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 760px) {
  .nav-btn { display: inline-flex; align-items: center; justify-content: center; width: 42px; height: 42px;
    border: 1px solid var(--line); border-radius: 9px; cursor: pointer; background: var(--white); }
  .nav-btn span, .nav-btn span::before, .nav-btn span::after { content: ""; display: block; width: 20px; height: 2px;
    background: var(--blue); position: relative; }
  .nav-btn span::before { position: absolute; top: -6px; } .nav-btn span::after { position: absolute; top: 6px; }
  .mainnav { display: none; position: absolute; top: 66px; left: 0; right: 0; background: var(--white);
    border-bottom: 1px solid var(--line); box-shadow: var(--shadow); }
  .mainnav ul { flex-direction: column; padding: .5rem; }
  .mainnav a { display: block; padding: .8rem; }
  .nav-toggle:checked ~ .mainnav { display: block; }
}
@media (max-width: 560px) {
  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
  .site-footer__grid { grid-template-columns: 1fr; }
  .hero__stats { grid-template-columns: 1fr 1fr; }
  .cta-band__inner { flex-direction: column; align-items: flex-start; }
  .eyebrow { letter-spacing: .1em; font-size: .72rem; }
  .btn { padding: .65rem 1rem; }
  .hero__cta { gap: .6rem; }
}