/* RAIQT 鋭安網智 — landing page (structure adapted from reference site) */
:root {
  --navy: oklch(0.2458 0.00722 67.5);          /* #23201d */
  --navy-soft: oklch(0.276 0.0081 59.3);
  --accent: oklch(0.5553 0.1455 49);            /* #b45309 */
  --accent-bright: oklch(0.7686 0.16466 70.1);  /* #f59e0b */
  --bg: oklch(0.9702 0.0012 86);                /* #f7f6f3 */
  --card: #ffffff;
  --fg: oklch(0.2253 0.0036 66.7);              /* #1c1917 */
  --muted: oklch(0.5408 0.0082 69.7);           /* #78716c */
  --border: oklch(0.9357 0.0017 83.9);          /* #e7e5e4 */
  --border-dark: oklch(0.3741 0.0087 67.6);
  --muted-dark: oklch(0.7714 0.006 70);         /* #a8a29e */
  --fg-dark: oklch(0.9827 0.0011 70.4);         /* #faf9f7 */
  --font: "Noto Sans TC", "Geist", -apple-system, "PingFang TC", "Microsoft JhengHei", sans-serif;
  --mono: "Geist Mono", "Noto Sans TC", ui-monospace, monospace;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { font-family: var(--font); background: var(--bg); color: var(--fg); line-height: 1.7; font-size: 16px; -webkit-font-smoothing: antialiased; }
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; background: none; border: 0; cursor: pointer; color: inherit; }
ul, ol { list-style: none; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.container { max-width: 1152px; margin: 0 auto; padding: 0 16px; }
.mono { font-family: var(--mono); }

/* buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; font-weight: 500; border-radius: 2px; transition: background .15s, color .15s, border-color .15s; }
.btn-primary { background: var(--accent); color: #fff; padding: 13px 26px; }
.btn-primary:hover { background: oklch(0.4753 0.1255 49); }
.btn-dark { background: var(--accent-bright); color: var(--navy); padding: 13px 26px; font-weight: 600; }
.btn-dark:hover { background: oklch(0.8286 0.15466 70.1); }
.btn-ghost { border: 1px solid var(--border-dark); color: var(--fg-dark); padding: 13px 26px; }
.btn-ghost:hover { border-color: var(--muted-dark); background: oklch(0.306 0.0086 60); }
.btn-outline { border: 1px solid var(--accent); color: var(--accent); padding: 9px 18px; font-size: 14px; }
.btn-outline:hover { background: var(--accent); color: #fff; }
.btn-sm { padding: 9px 18px; font-size: 14px; }
.btn-block { width: 100%; }

/* section heading helpers */
.kicker { font-size: 14px; font-weight: 600; color: var(--accent); margin-bottom: 8px; }
h2 { font-size: 30px; font-weight: 700; line-height: 1.3; }
.sec-sub { color: var(--muted); margin-top: 10px; max-width: 640px; }

/* ===== header ===== */
#top { position: sticky; top: 0; z-index: 50; background: #fff; }
#top.scrolled { border-bottom: 1px solid var(--border); }
.nav { height: 64px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.logo { display: flex; flex-direction: column; line-height: 1.25; }
.logo b { font-family: var(--mono); font-weight: 700; font-size: 18px; letter-spacing: .06em; color: var(--fg); }
.logo b span { color: var(--accent); }
.logo small { font-size: 11px; color: var(--muted); letter-spacing: .34em; }
.menu { display: flex; align-items: center; gap: 4px; }
.menu > li { position: relative; }
.menu > li > a { display: block; padding: 8px 12px; font-size: 15px; color: var(--fg); border-radius: 2px; }
.menu > li > a:hover { background: var(--bg); }
.drop { position: absolute; top: calc(100% + 4px); left: 0; width: 340px; background: #fff; border: 1px solid var(--border); padding: 8px; display: none; }
.menu > li:hover > .drop, .menu > li:focus-within > .drop { display: grid; grid-template-columns: 1fr 1fr; gap: 2px; }
.drop a { display: block; padding: 8px 10px; border-radius: 2px; }
.drop a:hover { background: var(--bg); }
.drop b { display: block; font-size: 14px; }
.drop small { display: block; font-size: 12px; color: var(--muted); line-height: 1.5; }
.nav-right { display: flex; align-items: center; gap: 14px; }
.nav-phone { font-family: var(--mono); font-size: 14px; font-weight: 500; color: var(--fg); }
.nav-phone:hover { color: var(--accent); }
.burger { display: none; flex-direction: column; gap: 5px; padding: 8px; }
.burger span { display: block; width: 22px; height: 2px; background: var(--fg); }

@media (max-width: 980px) {
  .menu { display: none; }
  .burger { display: flex; }
  .nav-phone { display: none; }
  #top.menu-open .menu { display: flex; flex-direction: column; align-items: stretch; gap: 0; position: absolute; top: 64px; left: 0; right: 0; background: #fff; border-bottom: 1px solid var(--border); padding: 12px 16px; }
  #top.menu-open .menu > li { width: 100%; }
  #top.menu-open .menu > li > a { padding: 12px 8px; border-bottom: 1px solid var(--border); }
  .drop { position: static; width: auto; display: none !important; grid-template-columns: 1fr; }
  #top.menu-open li.open > .drop { display: grid !important; padding: 4px 0 8px; }
  #top.menu-open .menu > li.has-drop > a::after { content: " ▾"; color: var(--muted); }
}

/* ===== hero ===== */
.hero { background: var(--navy); color: var(--fg-dark); }
.hero .grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 48px; align-items: center; padding: 96px 0; }
.hero .eyebrow { font-family: var(--mono); font-size: 13px; letter-spacing: .18em; color: var(--accent-bright); margin-bottom: 14px; }
.hero h1 { font-size: 48px; line-height: 1.2; font-weight: 700; margin-bottom: 20px; }
.hero .lead { font-size: 18px; color: var(--muted-dark); margin-bottom: 32px; max-width: 520px; }
.hero .cta-row { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 40px; }
.hero .stats { display: flex; gap: 56px; border-top: 1px solid var(--border-dark); padding-top: 24px; }
.hero .stat b { font-size: 26px; font-weight: 700; color: var(--accent-bright); }
.hero .stat b i { font-style: normal; font-size: 15px; font-weight: 400; color: var(--muted-dark); }
.hero .stat p { font-size: 13px; color: var(--muted-dark); }
.hero-img { height: 420px; border: 1px solid var(--border-dark); overflow: hidden; }
.hero-img img { width: 100%; height: 100%; object-fit: cover; }
@media (max-width: 900px) {
  .hero .grid { grid-template-columns: 1fr; padding: 64px 0; gap: 32px; }
  .hero h1 { font-size: 36px; }
  .hero-img { height: 260px; }
  .hero .stats { gap: 32px; }
}

/* ===== brands ===== */
.brands { background: #fff; border-bottom: 1px solid var(--border); padding: 56px 0; }
.brands h2 { text-align: center; font-size: 22px; margin-bottom: 32px; }
.brand-row { display: flex; flex-wrap: wrap; justify-content: center; gap: 18px 40px; }
.brand-row span { font-family: var(--mono); font-weight: 700; font-size: 19px; color: var(--muted); transition: color .15s; cursor: default; }
.brand-row span:hover { color: var(--accent); }

/* ===== challenges (dark) ===== */
.challenges { background: var(--navy); color: var(--fg-dark); padding: 80px 0; }
.challenges .head { margin-bottom: 40px; }
.challenges h2 { color: var(--fg-dark); }
.challenges .sub { color: var(--muted-dark); margin-top: 12px; max-width: 680px; }
.chall-strip { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--border-dark); border: 1px solid var(--border-dark); margin-bottom: 24px; }
.chall-strip div { background: var(--navy); padding: 18px 22px; }
.chall-strip b { display: block; font-size: 24px; font-weight: 700; color: var(--accent-bright); }
.chall-strip small { font-size: 13px; color: var(--muted-dark); }
.chall-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.chall-grid article { background: oklch(0.276 0.0081 59.3); border: 1px solid var(--border-dark); padding: 24px; }
.chall-grid .num { font-family: var(--mono); font-size: 32px; font-weight: 700; color: var(--accent-bright); line-height: 1; margin-bottom: 12px; }
.chall-grid h3 { font-size: 16px; font-weight: 600; margin-bottom: 8px; color: var(--fg-dark); }
.chall-grid p { font-size: 14px; color: var(--muted-dark); }
@media (max-width: 900px) {
  .chall-strip { grid-template-columns: 1fr; }
  .chall-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 560px) { .chall-grid { grid-template-columns: 1fr; } }

/* ===== products ===== */
.products { background: var(--bg); padding: 80px 0; }
.products .intro { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; margin-bottom: 48px; }
.products .intro .img { height: 320px; border: 1px solid var(--border); overflow: hidden; }
.products .intro .img img { width: 100%; height: 100%; object-fit: cover; }
.product-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.pcard { background: var(--card); border: 1px solid var(--border); padding: 26px; display: flex; flex-direction: column; transition: border-color .15s; }
.pcard:hover { border-color: oklch(0.6553 0.1155 49); }
.pcard .label { font-size: 12px; font-weight: 600; color: var(--accent); margin-bottom: 6px; }
.pcard h3 { font-size: 17px; font-weight: 600; margin-bottom: 4px; }
.pcard .brand { font-size: 13px; color: var(--muted); margin-bottom: 10px; }
.pcard .desc { font-size: 14px; color: var(--muted); flex: 1; margin-bottom: 16px; }
.tags { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 20px; }
.tags span { background: oklch(0.9699 0.00132 106.4); padding: 3px 8px; font-size: 12px; color: var(--muted); font-family: var(--mono); }
@media (max-width: 1000px) { .product-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 640px) { .product-grid { grid-template-columns: 1fr; } .products .intro { grid-template-columns: 1fr; } }

/* ===== advantages (white card) ===== */
.advantages { background: var(--card); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); padding: 80px 0; }
.advantages .intro { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; margin-bottom: 48px; }
.advantages .intro .img { height: 320px; border: 1px solid var(--border); overflow: hidden; order: 2; }
.advantages .intro .img img { width: 100%; height: 100%; object-fit: cover; }
.advantages .intro .txt { order: 1; }
.adv-stats { display: flex; gap: 48px; margin-top: 28px; }
.adv-stats b { font-size: 26px; font-weight: 700; color: var(--accent); }
.adv-stats b i { font-style: normal; font-size: 15px; font-weight: 400; color: var(--muted); }
.adv-stats p { font-size: 13px; color: var(--muted); }
.adv-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.adv-grid article { background: var(--bg); border: 1px solid var(--border); padding: 24px; }
.adv-grid .num { font-family: var(--mono); font-size: 13px; color: var(--accent); margin-bottom: 10px; }
.adv-grid h3 { font-size: 16px; font-weight: 600; margin-bottom: 4px; }
.adv-grid .tag { font-size: 12px; color: var(--accent); margin-bottom: 10px; }
.adv-grid p { font-size: 14px; color: var(--muted); }
@media (max-width: 1000px) {
  .adv-grid { grid-template-columns: 1fr 1fr; }
  .advantages .intro { grid-template-columns: 1fr; }
  .advantages .intro .img, .advantages .intro .txt { order: 0; }
}

/* ===== process ===== */
.process { background: var(--bg); padding: 80px 0; }
.process .head { text-align: center; margin-bottom: 48px; }
.process .head .sub { margin: 10px auto 0; }
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; counter-reset: step; }
.steps .step { position: relative; }
.steps .card { background: var(--card); border: 1px solid var(--border); padding: 26px 24px; height: 100%; }
.steps .num { font-family: var(--mono); font-size: 13px; color: var(--accent); margin-bottom: 10px; }
.steps h3 { font-size: 16px; font-weight: 600; margin-bottom: 6px; }
.steps p { font-size: 14px; color: var(--muted); }
.steps .arrow { position: absolute; top: 50%; right: -16px; transform: translateY(-50%); color: var(--accent); font-weight: 700; z-index: 2; }
@media (max-width: 900px) {
  .steps { grid-template-columns: 1fr 1fr; gap: 24px 16px; }
  .steps .arrow { display: none; }
}
@media (max-width: 520px) { .steps { grid-template-columns: 1fr; } }

/* ===== news ===== */
.news { background: var(--card); border-top: 1px solid var(--border); padding: 80px 0; }
.news .head { margin-bottom: 40px; }
.news .head .sub { margin-top: 10px; }
.news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.ncard { background: var(--bg); border: 1px solid var(--border); padding: 24px; display: flex; flex-direction: column; transition: border-color .15s; }
.ncard:hover { border-color: oklch(0.6553 0.1155 49); }
.ncard .meta { font-family: var(--mono); font-size: 12px; color: var(--muted); margin-bottom: 12px; display: flex; gap: 10px; }
.ncard .cat { color: var(--accent); }
.ncard h3 { font-size: 16px; font-weight: 600; line-height: 1.5; margin-bottom: 10px; }
.ncard p { font-size: 14px; color: var(--muted); flex: 1; margin-bottom: 16px; }
.ncard .more { font-size: 14px; font-weight: 500; color: var(--accent); }
.ncard .more:hover { text-decoration: underline; }
@media (max-width: 900px) { .news-grid { grid-template-columns: 1fr; } }

/* ===== faq ===== */
.faq { background: var(--bg); padding: 80px 0; }
.faq .head { margin-bottom: 40px; }
.faq-list { border-top: 1px solid var(--border); }
.faq-item { border-bottom: 1px solid var(--border); }
.faq-q { width: 100%; display: flex; justify-content: space-between; align-items: center; gap: 24px; padding: 22px 4px; text-align: left; font-size: 16px; font-weight: 600; color: var(--fg); }
.faq-q:hover { color: var(--accent); }
.faq-q .mark { font-family: var(--mono); font-size: 20px; font-weight: 400; color: var(--accent); transition: transform .2s; flex: none; }
.faq-item.open .faq-q .mark { transform: rotate(45deg); }
.faq-a { display: none; padding: 0 4px 22px; font-size: 15px; color: var(--muted); max-width: 760px; }
.faq-item.open .faq-a { display: block; }

/* ===== cta ===== */
.cta { background: var(--navy); color: var(--fg-dark); padding: 80px 0; }
.cta .inner { text-align: center; max-width: 720px; margin: 0 auto; }
.cta h2 { color: var(--fg-dark); margin-bottom: 12px; }
.cta p { color: var(--muted-dark); margin-bottom: 32px; }
.cta .row { display: flex; flex-wrap: wrap; justify-content: center; gap: 14px; }

/* ===== footer ===== */
footer { background: var(--navy); color: var(--muted-dark); border-top: 1px solid var(--border-dark); padding: 64px 0 0; font-size: 14px; }
.foot-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 40px; padding-bottom: 48px; }
.foot-brand b { font-family: var(--mono); font-size: 18px; letter-spacing: .06em; color: var(--fg-dark); display: block; margin-bottom: 4px; }
.foot-brand b span { color: var(--accent-bright); }
.foot-brand small { display: block; font-size: 11px; letter-spacing: .34em; color: var(--muted-dark); margin-bottom: 16px; }
.foot-brand p { margin-bottom: 16px; max-width: 300px; }
.foot-contact li { display: flex; gap: 10px; margin-bottom: 10px; }
.foot-contact b { color: var(--fg-dark); font-weight: 500; min-width: 52px; }
.foot-col h4 { font-size: 13px; font-weight: 600; color: var(--fg-dark); margin-bottom: 16px; }
.foot-col li { margin-bottom: 10px; }
.foot-col a:hover { color: var(--fg-dark); }
.foot-bottom { border-top: 1px solid var(--border-dark); padding: 20px 0; display: flex; flex-wrap: wrap; gap: 8px 24px; justify-content: space-between; font-size: 13px; }
.foot-bottom .mono { font-size: 12px; }
@media (max-width: 900px) { .foot-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .foot-grid { grid-template-columns: 1fr; } }

/* reveal (progressive enhancement) */
@media (prefers-reduced-motion: no-preference) {
  .reveal { opacity: 0; transform: translateY(14px); transition: opacity .6s ease, transform .6s ease; }
  .reveal.in { opacity: 1; transform: none; }
}