/* Rightek 官網
   色票取自 brand/rightek/rightek-mark.svg 的實際像素值。
   不載入外部字型與外部資源：整站零第三方請求。 */

:root {
  --ink:        #03515D;
  --accent:     #28C2B6;
  --paper:      #FEFCF9;
  --paper-alt:  #F4F1EC;
  --muted:      #5C6B6E;
  --rule:       #E2DDD6;
  --measure:    68ch;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink:       #E8F1F2;
    --accent:    #3FD6C8;
    --paper:     #062B31;
    --paper-alt: #0A3B43;
    --muted:     #9BB0B4;
    --rule:      #14505A;
  }
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: system-ui, -apple-system, "Segoe UI", "Noto Sans TC",
               "PingFang TC", "Microsoft JhengHei", sans-serif;
  font-size: clamp(16px, 1rem + 0.15vw, 18px);
  line-height: 1.7;
}

a { color: inherit; }

/* --- 頁首 --- */

.site-head {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2rem;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem clamp(1.25rem, 5vw, 4rem);
  border-bottom: 1px solid var(--rule);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
}

.brand-mark { width: 34px; height: auto; display: block; }

.brand-text { display: flex; flex-direction: column; line-height: 1.15; }

.brand-en {
  font-size: 1.35rem;
  font-weight: 600;
  letter-spacing: -0.015em;
}

.brand-zh {
  font-size: 0.8rem;
  letter-spacing: 0.32em;
  color: var(--muted);
}

.site-nav { display: flex; gap: clamp(1rem, 3vw, 2rem); }

.site-nav a {
  text-decoration: none;
  color: var(--muted);
  padding-bottom: 2px;
  border-bottom: 2px solid transparent;
}

.site-nav a:hover,
.site-nav a:focus-visible { color: var(--ink); border-bottom-color: var(--accent); }

/* --- 區塊 --- */

main { display: block; }

.hero,
.band {
  padding: clamp(3rem, 8vw, 6rem) clamp(1.25rem, 5vw, 4rem);
}

.band.alt { background: var(--paper-alt); }

.hero h1 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.9rem, 1.2rem + 3vw, 3.25rem);
  font-weight: 650;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.lede {
  margin: 0;
  max-width: var(--measure);
  font-size: clamp(1.05rem, 1rem + 0.5vw, 1.3rem);
  color: var(--muted);
}

h2 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.3rem, 1.1rem + 1vw, 1.75rem);
  letter-spacing: -0.01em;
}

h2::after {
  content: "";
  display: block;
  width: 2.5rem;
  height: 3px;
  margin-top: 0.6rem;
  background: var(--accent);
}

.note {
  margin: 0 0 2rem;
  max-width: var(--measure);
  color: var(--muted);
  font-size: 0.95rem;
}

/* --- 服務卡片 --- */

.cards {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 17rem), 1fr));
  background: var(--rule);
  border: 1px solid var(--rule);
}

.cards li {
  background: var(--paper);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.band.alt .cards li { background: var(--paper-alt); }

.cards h3 { margin: 0; font-size: 1.05rem; font-weight: 620; }

.cards p { margin: 0; color: var(--muted); font-size: 0.95rem; }

.code {
  margin-top: auto;
  padding-top: 0.75rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* --- 公司資料 --- */

.facts {
  margin: 0;
  display: grid;
  gap: 0;
  max-width: 46rem;
  border-top: 1px solid var(--rule);
}

.facts > div {
  display: grid;
  grid-template-columns: minmax(7rem, 12rem) 1fr;
  gap: 1rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--rule);
}

.facts dt { color: var(--muted); font-size: 0.95rem; }
.facts dd { margin: 0; }

@media (max-width: 30rem) {
  .facts > div { grid-template-columns: 1fr; gap: 0.15rem; }
}

/* --- 聯絡 --- */

.contact-line { margin: 0; font-size: clamp(1.15rem, 1rem + 1vw, 1.6rem); }

.contact-line a {
  text-decoration: none;
  border-bottom: 2px solid var(--accent);
  padding-bottom: 2px;
}

.contact-line a:hover,
.contact-line a:focus-visible { color: var(--accent); }

/* --- 頁尾 --- */

.site-foot {
  padding: 2rem clamp(1.25rem, 5vw, 4rem);
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: 0.9rem;
}

.site-foot p { margin: 0; }

/* --- 無障礙 --- */

:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}