/* SynOne 產品專站。品牌深藍沿用陞釔企業站（#1e3a5f／#0f2342），強調色青綠。
   字型只用系統字（CSP 只允許本站資源，不載外部字型）。 */
:root {
  --navy: #0f2342; --navy-2: #1e3a5f; --ink: #16202e; --ink-2: #3a4555; --ink-3: #5d6878;
  --line: #e2e6ec; --bg: #ffffff; --bg-2: #f5f7fa; --accent: #0f8b7d; --accent-2: #0b6e63;
  --on-dark: #e9eef5; --on-dark-2: #a9b6c8;
  --radius: 6px; --wrap: 1180px;
  --font: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", system-ui, -apple-system, "Segoe UI", sans-serif;
}
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } * { transition: none !important; } }
body { margin: 0; font-family: var(--font); color: var(--ink); background: var(--bg); line-height: 1.75; font-size: 17px; }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent-2); }
a:focus-visible, button:focus-visible, summary:focus-visible, [tabindex]:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }
.narrow { max-width: 780px; }
.wrap.narrow { margin: 0 auto; }
.center { text-align: center; justify-content: center; }
.muted { color: var(--ink-3); } .small { font-size: 14px; }
.skip { position: absolute; left: -9999px; } .skip:focus { left: 12px; top: 12px; z-index: 50; background: #fff; padding: 8px 12px; }

/* 頁首 */
.site-header { position: sticky; top: 0; z-index: 20; background: rgba(15, 35, 66, .97); color: var(--on-dark); border-bottom: 1px solid rgba(255,255,255,.08); }
.header-row { display: flex; align-items: center; gap: 20px; min-height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; color: #fff; text-decoration: none; flex-shrink: 0; }
.brand img { background: #fff; border-radius: 4px; padding: 2px; width: 36px; height: auto; }
.brand-name { font-weight: 700; font-size: 19px; letter-spacing: .01em; }
.brand-tag { font-size: 12px; color: var(--on-dark-2); letter-spacing: .08em; }
.site-nav { display: flex; align-items: center; gap: 18px; margin-left: auto; }
.site-nav ul { display: flex; gap: 4px; list-style: none; margin: 0; padding: 0; }
.site-nav a { color: var(--on-dark); text-decoration: none; font-size: 15px; padding: 6px 10px; border-radius: 4px; display: inline-block; }
.site-nav a:hover { background: rgba(255,255,255,.08); }
.site-nav a[aria-current="page"] { color: #fff; box-shadow: inset 0 -2px 0 var(--accent); border-radius: 0; }
.site-nav a.ext { color: var(--on-dark-2); }
.nav-actions { display: flex; align-items: center; gap: 10px; }
.lang { color: var(--on-dark-2) !important; }
.menu-btn { display: none; margin-left: auto; background: transparent; color: #fff; border: 1px solid rgba(255,255,255,.3); border-radius: 4px; padding: 6px 12px; font: inherit; font-size: 15px; cursor: pointer; }

/* 按鈕 */
.btn { display: inline-flex; align-items: center; justify-content: center; min-height: 46px; padding: 0 22px; border-radius: var(--radius); text-decoration: none; font-weight: 600; font-size: 16px; border: 1px solid transparent; transition: background .15s, border-color .15s; }
.btn-sm { min-height: 38px; padding: 0 16px; font-size: 15px; }
.btn-primary { background: var(--accent); color: #fff !important; }
.btn-primary:hover { background: var(--accent-2); }
.btn-ghost { border-color: currentColor; color: inherit; }
.text-link { color: inherit; font-size: 15px; }
.actions { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 16px; margin-top: 28px; }

/* Hero */
.hero { background: linear-gradient(180deg, var(--navy) 0%, #13305a 100%); color: var(--on-dark); padding: 72px 0 80px; overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr); gap: 56px; align-items: center; }
.kicker { margin: 0 0 14px; font-size: 13px; letter-spacing: .14em; text-transform: uppercase; color: #7fd3c8; }
.h1 { margin: 0; font-size: clamp(32px, 4.2vw, 50px); line-height: 1.2; color: #fff; letter-spacing: -.01em; font-weight: 700; }
.sub { margin: 12px 0 0; color: var(--on-dark-2); font-size: 15px; letter-spacing: .04em; }
.hero .lead { color: var(--on-dark); }
.lead { font-size: 18px; color: var(--ink-2); margin: 20px 0 0; max-width: 62ch; }
.hero .btn-ghost { color: #fff; }
.hero-shot { margin: 0; border-radius: 8px; overflow: hidden; box-shadow: 0 30px 60px rgba(0,0,0,.35); border: 1px solid rgba(255,255,255,.12); background: #fff; }

/* 區塊 */
.section { padding: 84px 0; border-bottom: 1px solid var(--line); }
.section.alt { background: var(--bg-2); }
.section.dark { background: var(--navy); color: var(--on-dark); border-bottom: 0; }
.section.dark .lead { color: var(--on-dark-2); }
.eyebrow { display: flex; align-items: center; gap: 12px; margin: 0 0 18px; font-size: 13px; letter-spacing: .14em; text-transform: uppercase; color: var(--accent-2); font-weight: 600; }
.section.dark .eyebrow { color: #7fd3c8; }
.eyebrow .num { font-variant-numeric: tabular-nums; color: var(--ink-3); }
.section.dark .eyebrow .num { color: var(--on-dark-2); }
.h2 { margin: 0; font-size: clamp(26px, 3vw, 34px); line-height: 1.3; }
h3 { margin: 0 0 8px; font-size: 19px; line-height: 1.45; }
.note { margin: 28px 0 0; padding: 16px 20px; border-left: 3px solid var(--accent); background: var(--bg-2); color: var(--ink-2); font-size: 15px; max-width: 78ch; }
.section.alt .note { background: #fff; }

.aud-list { list-style: none; margin: 8px 0 0; padding: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 32px; }
.aud { border-top: 2px solid var(--navy-2); padding-top: 20px; }
.aud p { margin: 0; color: var(--ink-2); font-size: 16px; }
.tags { display: flex; flex-wrap: wrap; gap: 6px; margin: 0 0 10px !important; }
.tags span { font-size: 13px; padding: 2px 10px; border: 1px solid var(--line); border-radius: 99px; background: #fff; color: var(--ink-3); }

.arch { display: grid; grid-template-columns: minmax(0, 1fr) 72px minmax(0, 1.3fr) 72px minmax(0, 1fr); align-items: stretch; margin-top: 36px; }
.arch-col { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; }
.arch-col.primary { border: 2px solid var(--navy-2); }
.arch-col h3 { font-size: 16px; color: var(--navy-2); }
.arch-col ul { margin: 0; padding-left: 18px; color: var(--ink-2); font-size: 15px; }
.arch-link { display: flex; flex-direction: column; justify-content: center; align-items: center; gap: 2px; font-size: 12px; color: var(--ink-3); text-align: center; line-height: 1.4; }
.arch-link .arrow { font-size: 22px; color: var(--accent); }

.shots { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 40px 32px; margin-top: 8px; }
.shots .shot:first-child { grid-column: 1 / -1; }
.shot { margin: 0; }
.shot img { border: 1px solid var(--line); border-radius: var(--radius); }
.shot figcaption { margin-top: 12px; font-size: 15px; color: var(--ink-2); }

.features { list-style: none; margin: 8px 0 0; padding: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 32px 48px; }
.features li { border-top: 1px solid var(--line); padding-top: 18px; }
.features p { margin: 0; color: var(--ink-2); font-size: 16px; }

.table-wrap { overflow-x: auto; margin-top: 28px; border: 1px solid var(--line); border-radius: var(--radius); }
.spec { width: 100%; border-collapse: collapse; font-size: 15px; min-width: 640px; }
.spec th, .spec td { text-align: left; vertical-align: top; padding: 16px 18px; border-bottom: 1px solid var(--line); }
.spec thead th { background: var(--bg-2); font-size: 13px; letter-spacing: .06em; color: var(--ink-3); }
.spec tbody th { width: 18%; color: var(--navy-2); }
.spec td:last-child { color: var(--ink-3); width: 32%; }
.spec tr:last-child > * { border-bottom: 0; }

.steps { list-style: none; margin: 8px 0 0; padding: 0; display: grid; gap: 20px; }
.steps li { display: grid; grid-template-columns: 56px minmax(0, 1fr); gap: 16px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; }
.step-n { font-size: 22px; font-weight: 700; color: var(--accent); font-variant-numeric: tabular-nums; }
.steps p { margin: 0; color: var(--ink-2); font-size: 16px; }

.faq details { border-bottom: 1px solid var(--line); padding: 4px 0; }
.faq summary { cursor: pointer; padding: 16px 0; font-weight: 600; font-size: 18px; list-style: none; display: flex; justify-content: space-between; gap: 16px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--accent); font-weight: 400; font-size: 22px; line-height: 1; }
.faq details[open] summary::after { content: "−"; }
.faq details p { margin: 0 0 18px; color: var(--ink-2); }

.series { list-style: none; margin: 28px 0 0; padding: 0; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; }
.card { display: flex; flex-direction: column; gap: 2px; height: 100%; padding: 16px 18px; border: 1px solid rgba(255,255,255,.16); border-radius: var(--radius); color: var(--on-dark); text-decoration: none; }
.card span { font-size: 14px; color: var(--on-dark-2); }
a.card:hover { border-color: #7fd3c8; }
.card.current { border-color: #7fd3c8; background: rgba(127, 211, 200, .08); }

.close { background: var(--bg-2); }
.close .actions { justify-content: center; }
.license { margin-top: 36px; }

/* 頁尾 */
.site-footer { background: #0b1a31; color: var(--on-dark-2); padding: 56px 0 24px; font-size: 15px; }
.site-footer a { color: var(--on-dark); text-decoration: none; }
.site-footer a:hover { text-decoration: underline; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 40px; }
.footer-brand { color: #fff; font-weight: 700; margin: 0 0 6px; }
.site-footer .muted { color: var(--on-dark-2); }
.footer-links { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; align-content: start; }
.footer-bottom { margin-top: 40px; padding-top: 20px; border-top: 1px solid rgba(255,255,255,.08); }

/* 斷點 */
@media (max-width: 1080px) {
  .menu-btn { display: inline-block; }
  .site-nav { display: none; position: absolute; left: 0; right: 0; top: 64px; background: var(--navy); flex-direction: column; align-items: stretch; padding: 12px 24px 20px; border-bottom: 1px solid rgba(255,255,255,.1); }
  .site-nav.open { display: flex; }
  .site-nav ul { flex-direction: column; }
  .site-nav a { padding: 10px 4px; }
  .site-nav a[aria-current="page"] { box-shadow: inset 3px 0 0 var(--accent); padding-left: 12px; }
  .nav-actions { margin-top: 8px; }
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .series { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 860px) {
  .aud-list, .features, .shots { grid-template-columns: 1fr; }
  .arch { grid-template-columns: 1fr; gap: 0; }
  .arch-link { flex-direction: row; gap: 10px; padding: 10px 0; }
  .arch-link .arrow { transform: rotate(90deg); }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
}
@media (max-width: 560px) {
  body { font-size: 16px; }
  .section { padding: 60px 0; }
  .hero { padding: 48px 0 56px; }
  .wrap { padding: 0 16px; }
  .brand-tag { display: none; }
  .series { grid-template-columns: 1fr; }
  .steps li { grid-template-columns: 1fr; gap: 6px; }
}