:root {
  --ink: #0d1722;
  --ink-soft: #425263;
  --paper: #f6f8fb;
  --surface: #ffffff;
  --line: #dce3ea;
  --navy: #061522;
  --navy-2: #0a2437;
  --blue: #076eb8;
  --cyan: #38bdf8;
  --accent: #ffa33a;
  --radius: 2px;
  --shadow: 0 20px 60px rgba(5, 21, 34, .12);
  --shell: min(1180px, calc(100vw - 40px));
  --font: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans TC", sans-serif;
}

* { box-sizing: border-box; }
html { overflow-x: hidden; scroll-behavior: smooth; background: var(--paper); }
body { margin: 0; overflow-x: hidden; color: var(--ink); background: var(--paper); font: 400 16px/1.72 var(--font); -webkit-font-smoothing: antialiased; }
body.nav-open { overflow: hidden; }
a { color: inherit; text-decoration: none; }
button, input { font: inherit; }
button { color: inherit; }
::selection { color: #fff; background: #0b6da8; }
.skip-link { position: fixed; z-index: 1000; top: 10px; left: 10px; transform: translateY(-150%); padding: 10px 16px; border-radius: 10px; color: #fff; background: var(--navy); }
.skip-link:focus { transform: none; }
.section-shell { width: var(--shell); margin-inline: auto; }
.visually-hidden { position: absolute !important; width: 1px !important; height: 1px !important; padding: 0 !important; margin: -1px !important; overflow: hidden !important; clip: rect(0, 0, 0, 0) !important; white-space: nowrap !important; border: 0 !important; }
.eyebrow { display: inline-flex; align-items: center; gap: 9px; color: var(--blue); font-size: .72rem; font-weight: 750; letter-spacing: .15em; text-transform: uppercase; }
.eyebrow::before { width: 28px; height: 1px; content: ""; background: currentColor; }
.eyebrow.light { color: #9ddcff; }
.muted { color: var(--ink-soft); }
.button { display: inline-flex; min-height: 48px; align-items: center; justify-content: center; gap: 9px; padding: 0 20px; border: 1px solid transparent; border-radius: 999px; font-weight: 700; transition: transform .25s ease, background .25s ease, border-color .25s ease; }
.button:hover { transform: translateY(-2px); }
.button.primary { color: #fff; background: var(--blue); }
.button.secondary { border-color: rgba(255,255,255,.36); color: #fff; background: rgba(6,21,34,.3); backdrop-filter: blur(12px); }
.button.light { color: var(--navy); background: #fff; }
.text-link { display: inline-flex; align-items: center; gap: 7px; color: var(--blue); font-weight: 720; }
.text-link::after { width: 17px; height: 17px; content: ""; background: currentColor; mask: url("/assets/icons/arrow_forward.svg") center/contain no-repeat; }

.site-header { position: sticky; z-index: 100; top: 0; border-bottom: 1px solid rgba(220,227,234,.72); background: rgba(246,248,251,.84); backdrop-filter: blur(18px) saturate(150%); }
.nav-shell { width: var(--shell); min-height: 70px; margin-inline: auto; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-size: 1.08rem; font-weight: 800; letter-spacing: -.02em; }
.brand-mark { width: 30px; height: 30px; flex: 0 0 auto; background: url("/assets/pwa/kaelith-logo-mark.svg") center/contain no-repeat; pointer-events: none; user-select: none; }
.primary-nav { display: flex; align-items: center; gap: 8px; }
.primary-nav a { padding: 9px 13px; border-radius: 999px; color: #2d3b49; font-size: .92rem; font-weight: 650; }
.primary-nav a:hover, .primary-nav a[aria-current="page"] { color: var(--blue); background: #e8f3fa; }
.primary-nav .nav-contact { margin-left: 4px; color: #fff; background: var(--navy); }
.primary-nav .nav-contact:hover { color: #fff; background: #123047; }
.nav-toggle { display: none; width: 44px; height: 44px; padding: 0; border: 0; border-radius: 12px; background: transparent; align-items: center; justify-content: center; }
.nav-toggle-lines { width: 23px; height: 17px; display: flex; flex-direction: column; justify-content: space-between; }
.nav-toggle-lines span { width: 23px; height: 2px; display: block; border-radius: 2px; background: var(--ink); transform-origin: center; transition: transform .25s ease, opacity .2s ease; }
.nav-toggle[aria-expanded="true"] .nav-toggle-lines span:first-child { transform: translateY(7.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-lines span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-lines span:last-child { transform: translateY(-7.5px) rotate(-45deg); }

.home-hero, .page-hero { position: relative; isolation: isolate; overflow: hidden; color: #fff; background-color: var(--navy); background-position: center; background-size: cover; }
.home-hero::before, .page-hero::before { position: absolute; z-index: -1; inset: 0; content: ""; background: linear-gradient(90deg, rgba(3,14,24,.94) 0%, rgba(3,14,24,.72) 42%, rgba(3,14,24,.2) 75%), linear-gradient(0deg, rgba(3,14,24,.55), transparent 48%); }
.home-hero { min-height: min(790px, calc(100svh - 70px)); display: grid; align-items: end; background-image: url("https://img.kaelith.tw/assets/brand/hero-v250.webp"); animation: cinematic-pan 18s ease-in-out infinite alternate; }
.home-hero-content { width: var(--shell); margin-inline: auto; padding: clamp(110px, 17vh, 180px) 0 clamp(72px, 12vh, 110px); }
.home-hero h1 { max-width: 760px; margin: 18px 0; font-size: clamp(3rem, 7vw, 6.4rem); line-height: .98; letter-spacing: -.065em; text-wrap: balance; }
.home-hero p { max-width: 590px; margin: 0; color: #d2e2ec; font-size: clamp(1.05rem, 2vw, 1.3rem); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
@keyframes cinematic-pan { from { background-position: 48% 50%; } to { background-position: 54% 48%; } }

.intro-strip { padding: 58px 0; border-bottom: 1px solid var(--line); }
.intro-strip-grid { display: grid; grid-template-columns: .85fr 1.65fr; align-items: start; gap: 8vw; }
.intro-strip h2 { max-width: 830px; margin: 0; font-size: clamp(1.85rem, 3.2vw, 3.1rem); line-height: 1.18; letter-spacing: -.04em; text-wrap: balance; }
.capabilities { padding: 110px 0; }
.section-heading { display: grid; grid-template-columns: .8fr 1.8fr; gap: 8vw; align-items: end; margin-bottom: 42px; }
.section-heading h2 { margin: 8px 0 0; font-size: clamp(2.1rem, 4vw, 4.1rem); line-height: 1.08; letter-spacing: -.05em; text-wrap: balance; }
.section-heading p { max-width: 520px; margin: 0 0 7px; color: var(--ink-soft); }
.capability-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.capability-card { min-height: 470px; position: relative; isolation: isolate; overflow: hidden; display: flex; align-items: end; padding: 30px; border-radius: var(--radius); color: #fff; background-position: center; background-size: cover; box-shadow: var(--shadow); }
.capability-card::before { position: absolute; z-index: -1; inset: 0; content: ""; background: linear-gradient(0deg, rgba(3,14,24,.95), rgba(3,14,24,.05) 72%); }
.capability-card h3 { margin: 0 0 7px; font-size: 1.55rem; }
.capability-card p { margin: 0; color: #d7e6ef; }
.capability-card.product { background-image: url("https://img.kaelith.tw/assets/brand/product-engineering-v250-1280.webp"); }
.capability-card.infrastructure { background-image: url("https://img.kaelith.tw/assets/brand/infrastructure-v250-1280.webp"); }
.capability-card.observability { background-image: url("https://img.kaelith.tw/assets/brand/observability-v250-1280.webp"); }

.principles { padding: 110px 0; color: #fff; background: var(--navy); }
.principles .section-heading p { color: #adbfcb; }
.principle-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; border: 1px solid #18354a; background: #18354a; }
.principle { min-height: 250px; padding: 28px; background: var(--navy); }
.principle span { color: #77caef; font-size: .77rem; font-weight: 760; }
.principle h3 { margin: 54px 0 10px; font-size: 1.25rem; }
.principle p { margin: 0; color: #aebfca; font-size: .94rem; }

.article-showcase { padding: 110px 0 120px; overflow: hidden; }
.rail-controls { display: flex; gap: 8px; justify-content: flex-end; margin-top: -22px; margin-bottom: 18px; }
.icon-button { width: 44px; height: 44px; display: inline-grid; place-items: center; border: 1px solid var(--line); border-radius: 50%; background: var(--surface); cursor: pointer; transition: border-color .2s ease, transform .2s ease; }
.icon-button:hover { border-color: #91bcd5; transform: translateY(-1px); }
.icon { width: 19px; height: 19px; display: block; background: currentColor; mask-position: center; mask-repeat: no-repeat; mask-size: contain; }
.icon.search { mask-image: url("/assets/icons/search.svg"); }
.icon.share { mask-image: url("/assets/icons/share.svg"); }
.icon.link { mask-image: url("/assets/icons/content_copy.svg"); }
.icon.left { mask-image: url("/assets/icons/chevron_left.svg"); }
.icon.right { mask-image: url("/assets/icons/chevron_right.svg"); }
.icon.close { mask-image: url("/assets/icons/close.svg"); }
.article-rail { display: grid; grid-auto-flow: column; grid-auto-columns: minmax(305px, 39vw); gap: 16px; overflow-x: auto; overscroll-behavior-inline: contain; scroll-snap-type: x mandatory; scrollbar-width: thin; scrollbar-color: #9aaab8 transparent; padding: 4px max(20px, calc((100vw - min(1180px, calc(100vw - 40px))) / 2)) 24px; }
.article-card { --cover-image: none; position: relative; isolation: isolate; overflow: hidden; min-height: 440px; scroll-snap-align: start; display: flex; align-items: end; padding: 28px; border-radius: var(--radius); color: #fff; background-color: var(--navy-2); background-image: linear-gradient(0deg, rgba(2,12,20,.96), rgba(2,12,20,.12) 72%), var(--cover-image); background-position: center; background-size: cover; box-shadow: 0 14px 40px rgba(6,21,34,.15); }
.article-card-copy { position: relative; z-index: 2; transition: opacity .2s ease; }
.article-card-category { display: block; margin-bottom: 8px; color: #9edcff; font-size: .72rem; font-weight: 760; letter-spacing: .08em; }
.article-card h3 { margin: 0 0 10px; font-size: clamp(1.3rem, 2.2vw, 1.7rem); line-height: 1.28; text-wrap: balance; }
.article-card p { margin: 0; color: #d1dfe8; font-size: .92rem; }
.article-card time { display: block; margin-top: 18px; color: #9fb1bd; font-size: .78rem; }
.article-card.all-articles { background-image: radial-gradient(circle at 75% 20%, rgba(56,189,248,.23), transparent 33%), linear-gradient(145deg, #09243a, #061522); }
.article-card.all-articles .all-arrow { width: 48px; height: 48px; display: grid; place-items: center; margin-bottom: 24px; border: 1px solid rgba(255,255,255,.3); border-radius: 50%; }

.contact-band { padding: 90px 0; color: #fff; background: #0a3049; }
.contact-grid { display: grid; grid-template-columns: 1.45fr 1fr; gap: 8vw; align-items: end; }
.contact-grid h2 { max-width: 720px; margin: 12px 0 0; font-size: clamp(2.2rem, 4vw, 4.4rem); line-height: 1.07; letter-spacing: -.05em; }
.contact-links { display: grid; gap: 9px; }
.contact-links a { display: flex; justify-content: space-between; gap: 18px; padding: 16px 0; border-bottom: 1px solid rgba(255,255,255,.2); font-weight: 690; }

.page-hero { min-height: 520px; display: flex; align-items: end; background-image: var(--page-image); }
.page-hero-content { width: var(--shell); margin-inline: auto; padding: 130px 0 72px; }
.page-hero h1 { max-width: 820px; margin: 15px 0; font-size: clamp(3rem, 6vw, 5.7rem); line-height: 1; letter-spacing: -.06em; text-wrap: balance; }
.page-hero p { max-width: 650px; margin: 0; color: #d2e2ec; font-size: 1.15rem; }
.page-about { --page-image: url("https://img.kaelith.tw/assets/brand/product-engineering-v250.webp"); }
.page-security { --page-image: url("https://img.kaelith.tw/assets/brand/security-visual-v250.webp"); }
.page-status, .page-changelog { --page-image: url("https://img.kaelith.tw/assets/brand/observability-v250.webp"); }
.page-privacy, .page-articles { --page-image: url("https://img.kaelith.tw/assets/brand/infrastructure-v250.webp"); }
.content-section { padding: 95px 0; }
.content-grid { display: grid; grid-template-columns: .75fr 1.8fr; gap: 8vw; }
.content-grid h2 { margin: 0; font-size: clamp(1.7rem, 3vw, 2.7rem); line-height: 1.18; letter-spacing: -.035em; }
.content-copy { max-width: 760px; }
.content-copy > :first-child { margin-top: 0; }
.content-copy h3 { margin-top: 36px; font-size: 1.25rem; }
.content-copy p, .content-copy li { color: #354657; }
.content-copy code, .article-content code { padding: .12em .38em; border-radius: 5px; color: #093c5f; background: #e8f3f9; font: .92em ui-monospace, SFMono-Regular, Consolas, monospace; }
.feature-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; margin: 30px 0 0; padding: 0; list-style: none; }
.feature-list li { padding: 22px; border: 1px solid var(--line); border-radius: 16px; background: var(--surface); }
.status-list { display: grid; gap: 12px; }
.status-item { display: grid; grid-template-columns: 16px 1fr auto; align-items: center; gap: 13px; padding: 18px 20px; border: 1px solid var(--line); border-radius: 16px; background: #fff; }
.status-dot { width: 10px; height: 10px; border-radius: 50%; background: #19a267; box-shadow: 0 0 0 4px #dcf5e8; }

.article-tools { position: sticky; z-index: 90; top: 70px; border-bottom: 1px solid var(--line); background: rgba(246,248,251,.94); backdrop-filter: blur(14px); }
.article-tools-inner { width: var(--shell); min-height: 56px; margin-inline: auto; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.article-progress { position: absolute; bottom: -1px; left: 0; width: 100%; height: 2px; transform: scaleX(0); transform-origin: left; background: var(--blue); }
.tool-group { display: flex; gap: 8px; }
.tool-label { color: var(--ink-soft); font-size: .85rem; }
.article-hero { --cover-image: none; min-height: 590px; position: relative; isolation: isolate; display: flex; align-items: end; color: #fff; background-image: linear-gradient(90deg, rgba(2,12,20,.95) 0%, rgba(2,12,20,.69) 48%, rgba(2,12,20,.18)), var(--cover-image); background-position: center; background-size: cover; }
.article-hero-copy { width: var(--shell); margin-inline: auto; padding: 130px 0 74px; }
.article-hero h1 { max-width: 900px; margin: 14px 0; font-size: clamp(2.7rem, 5.3vw, 5.1rem); line-height: 1.05; letter-spacing: -.055em; text-wrap: balance; }
.article-hero p { max-width: 690px; margin: 0; color: #d4e1e8; font-size: 1.1rem; }
.article-meta { display: flex; gap: 16px; margin-top: 24px; color: #a9bfcc; font-size: .84rem; }
.breadcrumbs { width: var(--shell); margin: 24px auto; font-size: .82rem; }
.breadcrumbs ol { display: flex; flex-wrap: wrap; gap: 8px; margin: 0; padding: 0; list-style: none; color: #607181; }
.breadcrumbs li:not(:last-child)::after { margin-left: 8px; content: "/"; color: #9faeba; }
.article-layout { display: grid; grid-template-columns: minmax(0, 760px) 250px; justify-content: space-between; gap: 70px; padding: 84px 0 110px; }
.article-content { min-width: 0; }
.article-lead { margin-bottom: 58px; padding: 25px 28px; border-left: 3px solid var(--blue); background: #edf4f8; font-size: 1.08rem; }
.article-lead p { margin: 0; }
.article-section { display: grid; grid-template-columns: 38px 1fr; gap: 22px; padding: 45px 0; border-top: 1px solid var(--line); }
.article-section > span { color: var(--blue); font: 750 .75rem var(--font); }
.article-section h2 { margin: -5px 0 18px; font-size: clamp(1.55rem, 2.6vw, 2.15rem); line-height: 1.25; letter-spacing: -.03em; }
.article-section h3 { margin-top: 30px; font-size: 1.15rem; }
.article-section p, .article-section li { color: #354657; }
.article-section li + li { margin-top: 8px; }
.article-callout { margin-top: 22px; padding: 20px 22px; border-radius: 14px; background: #eef7fb; }
.article-aside { position: sticky; top: 150px; align-self: start; }
.article-aside strong { font-size: .78rem; letter-spacing: .12em; }
.article-aside nav { display: grid; margin-top: 15px; border-top: 1px solid var(--line); }
.article-aside nav a { padding: 12px 0; border-bottom: 1px solid var(--line); color: #536474; font-size: .82rem; }
.article-aside nav a:hover { color: var(--blue); }
.related-section { padding: 80px 0; color: #fff; background: var(--navy); }
.related-section h2 { margin: 8px 0 28px; font-size: 2.1rem; }
.related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.related-grid a { min-height: 160px; padding: 22px; border: 1px solid #19394f; border-radius: 15px; background: #092033; }
.related-grid span { display: block; margin-bottom: 22px; color: #79cbed; font-size: .72rem; }
.related-grid strong { font-size: 1.03rem; line-height: 1.45; }

.article-index-tools { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 14px; margin-bottom: 28px; }
.search-field { position: relative; flex: 1 1 360px; }
.search-field input { width: 100%; min-height: 52px; padding: 0 50px 0 18px; border: 1px solid var(--line); border-radius: 15px; outline: none; background: #fff; }
.search-field input:focus { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(7,110,184,.12); }
.search-field .icon { position: absolute; top: 17px; right: 17px; color: #647585; }
.filter-group { display: flex; flex-wrap: wrap; gap: 8px; }
.filter-button { min-height: 44px; padding: 0 15px; border: 1px solid var(--line); border-radius: 999px; background: #fff; cursor: pointer; }
.filter-button[aria-pressed="true"] { border-color: var(--navy); color: #fff; background: var(--navy); }
.article-index-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.article-index-grid .article-card { min-height: 410px; }
.empty-state { display: none; padding: 50px 0; text-align: center; color: var(--ink-soft); }
.empty-state.is-visible { display: block; }

.search-dialog { width: min(680px, calc(100vw - 28px)); padding: 0; border: 0; border-radius: 22px; box-shadow: 0 24px 90px rgba(2,12,20,.25); }
.search-dialog::backdrop { background: rgba(2,12,20,.62); backdrop-filter: blur(4px); }
.search-dialog-inner { padding: 24px; }
.dialog-head { display: flex; justify-content: space-between; align-items: center; gap: 14px; margin-bottom: 18px; }
.dialog-head h2 { margin: 0; font-size: 1.35rem; }
.dialog-results { max-height: 55vh; overflow: auto; display: grid; gap: 8px; margin-top: 14px; }
.dialog-results a { padding: 13px 14px; border-radius: 12px; background: #f0f4f7; }
.toast { position: fixed; z-index: 500; right: 20px; bottom: 20px; transform: translateY(130%); padding: 12px 17px; border-radius: 12px; color: #fff; background: var(--navy); box-shadow: var(--shadow); transition: transform .25s ease; }
.toast.is-visible { transform: none; }

.error-page { min-height: 100svh; display: grid; place-items: center; padding: 30px; color: #fff; background-color: var(--navy); background-image: linear-gradient(90deg, rgba(2,12,20,.92), rgba(2,12,20,.5)), url("https://img.kaelith.tw/assets/brand/observability-v250.webp"); background-position: center; background-size: cover; }
.error-card { width: min(680px, 100%); padding: clamp(30px, 6vw, 60px); border: 1px solid rgba(255,255,255,.18); border-radius: 26px; background: rgba(5,22,35,.72); backdrop-filter: blur(18px); }
.error-code { color: #8ad7f7; font-size: .8rem; font-weight: 750; letter-spacing: .15em; }
.error-card h1 { margin: 10px 0; font-size: clamp(2.2rem, 6vw, 4.6rem); line-height: 1.02; letter-spacing: -.05em; }
.error-card p { color: #c4d4de; }

.site-footer { padding: 66px 0 22px; color: #c3d0d8; background: #04111c; }
.footer-grid { width: var(--shell); margin-inline: auto; display: grid; grid-template-columns: 1.4fr repeat(3, 1fr); gap: 45px; }
.site-footer .brand { color: #fff; }
.footer-grid h3 { margin: 0 0 13px; color: #fff; font-size: .78rem; letter-spacing: .09em; }
.footer-grid a { display: block; width: max-content; max-width: 100%; margin: 9px 0; color: #9eb0bc; font-size: .88rem; }
.footer-grid a:hover { color: #fff; }
.footer-brand p { max-width: 330px; color: #8195a3; font-size: .88rem; }
.footer-bottom { width: var(--shell); margin: 48px auto 0; padding-top: 18px; border-top: 1px solid #142b3b; display: flex; justify-content: space-between; color: #708591; font-size: .78rem; }

.reveal { opacity: 0; transform: translateY(18px); transition: opacity .65s ease, transform .65s ease; }
.reveal.is-visible { opacity: 1; transform: none; }

@media (max-width: 980px) {
  .nav-toggle { display: flex; }
  .primary-nav { position: fixed; top: 70px; right: 0; bottom: 0; left: 0; display: grid; align-content: start; gap: 2px; padding: 24px 20px; transform: translateX(100%); background: rgba(246,248,251,.98); transition: transform .28s ease; }
  .primary-nav.is-open { transform: none; }
  .primary-nav a { padding: 14px 16px; font-size: 1rem; }
  .primary-nav .nav-contact { margin: 10px 0 0; text-align: center; }
  .capability-grid, .article-index-grid { grid-template-columns: repeat(2, 1fr); }
  .principle-grid { grid-template-columns: repeat(2, 1fr); }
  .article-layout { grid-template-columns: 1fr; }
  .article-aside { position: static; order: -1; padding: 20px; border: 1px solid var(--line); border-radius: 15px; }
  .related-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 720px) {
  :root { --shell: min(100% - 28px, 1180px); }
  .home-hero { min-height: 700px; background-image: url("https://img.kaelith.tw/assets/brand/hero-v250-768.webp"); background-position: 62% center; }
  .home-hero::before { background: linear-gradient(0deg, rgba(3,14,24,.95) 0%, rgba(3,14,24,.6) 65%, rgba(3,14,24,.2)); }
  .home-hero-content { padding-bottom: 55px; }
  .home-hero h1 { font-size: clamp(2.9rem, 15vw, 4.5rem); }
  .intro-strip-grid, .section-heading, .content-grid, .contact-grid { grid-template-columns: 1fr; gap: 24px; }
  .capabilities, .principles, .article-showcase, .content-section { padding: 75px 0; }
  .capability-grid, .article-index-grid { grid-template-columns: 1fr; }
  .capability-card { min-height: 410px; }
  .principle-grid { grid-template-columns: 1fr; }
  .article-rail { grid-auto-columns: 84vw; }
  .article-card { min-height: 410px; }
  .page-hero { min-height: 500px; }
  .page-about { --page-image: url("https://img.kaelith.tw/assets/brand/product-engineering-v250-768.webp"); }
  .page-security { --page-image: url("https://img.kaelith.tw/assets/brand/security-visual-v250-768.webp"); }
  .page-status, .page-changelog { --page-image: url("https://img.kaelith.tw/assets/brand/observability-v250-768.webp"); }
  .page-privacy, .page-articles { --page-image: url("https://img.kaelith.tw/assets/brand/infrastructure-v250-768.webp"); }
  .page-hero::before { background: linear-gradient(0deg, rgba(3,14,24,.95), rgba(3,14,24,.26)); }
  .page-hero h1 { font-size: clamp(2.8rem, 14vw, 4.5rem); }
  .feature-list { grid-template-columns: 1fr; }
  .article-tools-inner .tool-label { display: none; }
  .article-hero { min-height: 570px; }
  .article-hero h1 { font-size: clamp(2.45rem, 12vw, 4.1rem); }
  .article-layout { padding-top: 55px; }
  .article-section { grid-template-columns: 28px 1fr; gap: 12px; }
  .article-section ul, .article-section ol { padding-left: 22px; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .footer-bottom { display: grid; gap: 5px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { scroll-behavior: auto !important; animation: none !important; transition-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
}

html[data-network="constrained"] .home-hero { animation: none; }

/* v2.5.1: restrained rectangular interface and editorial reading system */
.button, .primary-nav a, .nav-toggle, .icon-button, .feature-list li, .status-item, .search-field input, .filter-button, .search-dialog, .dialog-results a, .toast, .error-card, .article-callout, .related-grid a { border-radius: 2px; }
.button { min-height: 46px; padding: 0 19px; font-weight: 720; letter-spacing: .01em; }
.primary-nav { gap: 0; }
.primary-nav a { padding: 11px 14px; border-bottom: 2px solid transparent; }
.primary-nav a:hover, .primary-nav a[aria-current="page"] { color: var(--blue); background: transparent; border-bottom-color: var(--blue); }
.primary-nav .nav-contact { margin-left: 14px; border: 1px solid var(--navy); background: var(--navy); }
.primary-nav .nav-contact:hover { border-color: var(--blue); background: var(--blue); }
.nav-toggle { width: 46px; height: 46px; border-color: #c7d4dd; }
.icon-button { width: 42px; height: 42px; }
.icon-button:hover { border-color: var(--blue); transform: none; background: #edf6fa; }
.capability-card { border-radius: 0; box-shadow: none; }
.capability-card:hover { outline: 1px solid #86c9e8; outline-offset: 3px; }

.article-showcase { padding: 96px 0 105px; }
.article-showcase-head { display: grid; grid-template-columns: 145px minmax(0, 1fr) auto; gap: 32px; align-items: end; padding-bottom: 24px; border-bottom: 1px solid var(--line); }
.article-showcase-label { align-self: start; padding-top: 8px; }
.article-showcase-intro h2 { max-width: 760px; margin: 0; font-size: clamp(2.25rem, 4.2vw, 4.2rem); line-height: 1.08; letter-spacing: -.055em; text-wrap: balance; }
.article-showcase-intro p { max-width: 640px; margin: 15px 0 0; color: var(--ink-soft); }
.article-showcase .rail-controls { justify-content: flex-end; margin: 0; }
.article-rail { gap: 0; padding-top: 24px; padding-bottom: 26px; }
.article-rail .article-card { border-left: 1px solid var(--line); }
.article-rail .article-card:last-child { border-right: 1px solid var(--line); }
.article-card { --cover-image: none; min-height: 390px; display: grid; grid-template-rows: 170px 1fr; align-items: stretch; padding: 0; border-radius: 0; color: var(--ink); background: #fff; background-image: none; box-shadow: none; transition: background .18s ease, box-shadow .18s ease; }
.article-card:hover { color: var(--ink); background: #f7fafc; box-shadow: inset 0 3px 0 var(--blue); }
.article-card-visual { display: block; min-height: 0; background-color: var(--navy-2); background-image: linear-gradient(120deg, rgba(3,16,27,.36), rgba(3,16,27,.05)), var(--cover-image); background-position: center; background-size: cover; }
.article-card-copy { display: block; padding: 20px 21px 22px; }
.article-card-category { margin-bottom: 9px; color: #086ea9; letter-spacing: .06em; }
.article-card h3 { margin-bottom: 10px; font-size: 1.35rem; line-height: 1.3; }
.article-card p { color: #526574; line-height: 1.65; }
.article-card time { margin-top: 15px; color: #6f8290; }
.article-card.all-articles { display: block; color: #fff; background-image: linear-gradient(145deg, #0c3047, #061522); }
.article-card.all-articles:hover { color: #fff; box-shadow: inset 0 3px 0 #7ed4f4; }
.article-card.all-articles .article-card-copy { padding-top: 35px; }
.article-card.all-articles p, .article-card.all-articles time { color: #c0d4df; }
.article-card.all-articles .all-arrow { border-radius: 2px; }

.article-index-heading { display: grid; grid-template-columns: minmax(0, 1.35fr) minmax(260px, .65fr); gap: 48px; align-items: end; margin-bottom: 40px; padding-bottom: 25px; border-bottom: 1px solid var(--line); }
.article-index-heading h2 { margin: 9px 0 0; font-size: clamp(2.15rem, 4.3vw, 4.25rem); line-height: 1.06; letter-spacing: -.055em; text-wrap: balance; }
.article-index-heading p { max-width: 410px; margin: 0; color: var(--ink-soft); }
.article-index-tools { align-items: start; margin-bottom: 12px; }
.search-field { min-height: 52px; display: flex; align-items: stretch; flex: 1 1 370px; }
.search-field input { min-height: 52px; padding-left: 18px; border-radius: 0; }
.search-field .icon { right: 17px; }
.search-clear { position: absolute; right: 48px; min-height: 30px; border: 0; color: #456072; background: transparent; cursor: pointer; font: 650 .78rem var(--font); }
.search-clear:not([hidden]) { display: block; }
.filter-group { gap: 0; border: 1px solid var(--line); }
.filter-button { min-height: 50px; margin: -1px 0 -1px -1px; border-radius: 0; border-color: var(--line); font-weight: 670; }
.filter-button[aria-pressed="true"] { background: var(--navy); }
.search-status { min-height: 1.5rem; margin: 0 0 18px; color: #617485; font-size: .88rem; }
.article-index-grid { gap: 0; border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.article-index-grid .article-card { min-height: 390px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.article-index-grid .article-card[hidden],
.article-index-grid .article-card.is-filtered-out { display: none !important; }
.article-index-grid .article-card-visual { height: 172px; }
.empty-state { padding: 42px 0; border-bottom: 1px solid var(--line); text-align: left; }

.article-masthead { background: #eff4f7; border-bottom: 1px solid var(--line); }
.article-masthead-grid { display: grid; grid-template-columns: minmax(0, 1.18fr) minmax(310px, .72fr); min-height: 470px; }
.article-masthead-copy { align-self: center; padding: 80px 60px 74px 0; }
.article-kicker { margin: 17px 0 0; color: #587082; font-size: .82rem; font-weight: 690; letter-spacing: .05em; }
.article-kicker span { margin: 0 7px; color: #90a3af; }
.article-masthead h1 { max-width: 820px; margin: 17px 0; color: var(--ink); font-size: clamp(2.65rem, 5.3vw, 5.5rem); line-height: 1.04; letter-spacing: -.06em; text-wrap: balance; }
.article-masthead-copy > p:not(.article-kicker) { max-width: 650px; margin: 0; color: #4c6170; font-size: 1.08rem; }
.article-masthead-cover { --cover-image: none; margin: 44px 0; min-height: 0; background-color: var(--navy); background-image: linear-gradient(125deg, rgba(3,15,26,.25), rgba(3,15,26,.03)), var(--cover-image); background-position: center; background-size: cover; }
.article-meta { color: #587082; }
.article-layout { grid-template-columns: 180px minmax(0, 760px); justify-content: start; gap: 68px; padding: 72px 0 105px; }
.article-aside { top: 136px; }
.article-aside strong { color: #274154; }
.article-aside nav a { padding: 12px 0; }
.article-lead { margin-bottom: 46px; padding: 3px 0 3px 24px; border-left-width: 3px; background: transparent; font-size: 1.15rem; line-height: 1.75; }
.article-section { padding: 44px 0; }
.article-section p, .article-section li { font-size: 1.02rem; line-height: 1.82; }
.article-callout { padding: 20px 22px; border-left: 3px solid #4ba9d4; background: #edf7fb; }
.article-tools { background: rgba(255,255,255,.96); }

.security-exercise { margin-top: 52px; padding: 34px; border-top: 3px solid var(--blue); border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); border-left: 1px solid var(--line); background: #f4f8fa; }
.exercise-heading { max-width: 720px; padding-bottom: 22px; border-bottom: 1px solid var(--line); }
.exercise-heading h2 { margin: 8px 0 11px; font-size: clamp(1.65rem, 3vw, 2.25rem); line-height: 1.15; letter-spacing: -.035em; }
.exercise-heading p { margin: 0; color: #506575; }
.security-exercise fieldset { margin: 0; padding: 25px 0; border: 0; border-bottom: 1px solid var(--line); }
.security-exercise legend { width: 100%; padding: 0; color: #243d50; font-weight: 760; line-height: 1.5; }
.security-exercise legend > span { display: inline-block; min-width: 33px; margin-right: 8px; color: var(--blue); font: 760 .74rem var(--font); letter-spacing: .08em; }
.exercise-options { display: grid; gap: 8px; margin-top: 15px; }
.exercise-option { display: grid; grid-template-columns: 18px 1fr; gap: 12px; padding: 14px; border: 1px solid #ccd9e1; background: #fff; cursor: pointer; }
.exercise-option:has(input:focus-visible) { outline: 3px solid rgba(7,110,184,.22); outline-offset: 2px; }
.exercise-option:has(input:checked) { border-color: #5aaed5; background: #f2faff; }
.exercise-option.is-correct { border-color: #259b6d; background: #edfaf3; }
.exercise-option.is-incorrect { border-color: #d47b72; background: #fff4f2; }
.exercise-option input { margin: 3px 0 0; accent-color: var(--blue); }
.exercise-option strong, .exercise-option small { display: block; }
.exercise-option small { margin-top: 4px; color: #627584; line-height: 1.55; }
.exercise-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 25px; }
.button.text { border-color: transparent; color: #31576e; background: transparent; }
.button.text:hover { border-color: var(--line); background: #fff; }
.exercise-feedback { margin: 15px 0 0; color: #526a7a; font-size: .93rem; }
.exercise-feedback.is-success { color: #16764f; font-weight: 700; }
.exercise-feedback.is-incomplete { color: #9a5b14; font-weight: 700; }

@media (max-width: 980px) {
  .primary-nav { position: fixed; z-index: 250; top: 70px; right: 0; bottom: 0; left: 0; display: grid; align-content: start; gap: 0; padding: 31px 28px; transform: translateX(100%); background: #071724; background-image: linear-gradient(145deg, rgba(9,39,58,.98), rgba(3,15,25,.99)); transition: transform .28s ease; }
  .primary-nav::before { padding: 0 0 17px; border-bottom: 1px solid rgba(174,208,225,.25); content: "導覽"; color: #7ecfeb; font-size: .75rem; font-weight: 760; letter-spacing: .12em; }
  .primary-nav.is-open { transform: none; }
  .primary-nav a { padding: 17px 0; border-radius: 0; border-bottom: 1px solid rgba(174,208,225,.18); color: #d7e4eb; font-size: 1.05rem; }
  .primary-nav a:hover, .primary-nav a[aria-current="page"] { border-bottom-color: #72c8eb; color: #fff; background: transparent; }
  .primary-nav .nav-contact { margin: 24px 0 0; padding: 15px 18px; border: 1px solid #58bfe8; color: #fff; text-align: center; background: #0b6f9e; }
  .article-showcase-head { grid-template-columns: 120px minmax(0, 1fr); }
  .article-showcase-head .rail-controls { grid-column: 2; justify-content: start; }
  .article-index-heading { grid-template-columns: 1fr; gap: 18px; }
  .article-masthead-grid { grid-template-columns: minmax(0, 1fr) minmax(250px, .65fr); }
  .article-masthead-copy { padding-right: 38px; }
}

@media (max-width: 720px) {
  .article-showcase { padding-top: 74px; }
  .article-showcase-head { grid-template-columns: 1fr; gap: 15px; }
  .article-showcase-label { padding-top: 0; }
  .article-showcase-head .rail-controls { grid-column: auto; }
  .article-showcase-intro h2 { font-size: clamp(2rem, 10.5vw, 3.2rem); }
  .article-rail { grid-auto-columns: minmax(285px, 84vw); }
  .article-card { min-height: 370px; grid-template-rows: 155px 1fr; }
  .article-card-copy { padding: 18px; }
  .article-index-heading { margin-bottom: 30px; padding-bottom: 20px; }
  .article-index-heading h2 { font-size: clamp(2rem, 10.5vw, 3.25rem); }
  .filter-group { width: 100%; overflow-x: auto; flex-wrap: nowrap; }
  .filter-button { flex: 0 0 auto; }
  .article-masthead-grid { grid-template-columns: 1fr; min-height: 0; }
  .article-masthead-copy { padding: 60px 0 34px; }
  .article-masthead h1 { font-size: clamp(2.3rem, 11.5vw, 3.7rem); }
  .article-masthead-cover { height: 215px; margin: 0; }
  .article-layout { gap: 30px; padding-top: 44px; }
  .article-aside { order: 0; padding: 0; border: 0; border-radius: 0; }
  .article-aside nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .article-aside nav a { padding: 10px 9px 10px 0; font-size: .76rem; }
  .security-exercise { margin-top: 38px; padding: 22px 18px; }
  .security-exercise fieldset { padding: 21px 0; }
  .exercise-option { padding: 12px; }
}

/* v2.6.0: performance-first motion system and full-page navigation */
.home-hero { min-height: min(760px, calc(100svh - 70px)); background: radial-gradient(circle at 84% 18%, #123a57 0, #061522 48%, #030d16 100%); animation: none; }
.home-hero::before { z-index: 1; background: linear-gradient(90deg, rgba(3,14,24,.9) 0%, rgba(3,14,24,.58) 45%, rgba(3,14,24,.15) 100%), linear-gradient(0deg, rgba(3,14,24,.72), transparent 54%); }
.home-hero-content { position: relative; z-index: 3; }
.section-heading { grid-template-columns: minmax(0, 1.15fr) minmax(280px, .55fr); gap: 5vw; }
.section-heading h2 { max-width: 850px; }
.article-feature-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.article-feature-grid .article-card { min-height: 420px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.article-feature-grid .article-card.all-articles { display: flex; align-items: end; }
.article-showcase-head { grid-template-columns: 145px minmax(0, 1fr) auto; }
.article-index-link { min-height: 44px; display: inline-flex; align-items: center; gap: 14px; padding: 0 2px; border-bottom: 1px solid var(--ink); font-weight: 760; transition: color .2s ease, border-color .2s ease; }
.article-index-link:hover { border-color: var(--blue); color: var(--blue); }
.article-index-link .icon { width: 18px; height: 18px; }
/* v2.6.2: cinematic hero, designed as a real editorial space rather than a
   decorative interface. The photo is the LCP fallback; video is optional. */
.home-hero { background-image: url("https://img.kaelith.tw/assets/brand/hero-film-v265.webp") !important; background-position: center; }
.home-hero::before { background: linear-gradient(90deg, rgba(3,14,24,.18) 0%, rgba(3,14,24,.12) 38%, rgba(3,14,24,.72) 68%, rgba(3,14,24,.94) 100%), linear-gradient(0deg, rgba(3,14,24,.78), transparent 62%); }
.home-hero-content { margin-right: 0; margin-left: auto; max-width: min(45vw, 600px); }
.hero-film { position: absolute; z-index: 0; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: center; opacity: 0; pointer-events: none; transform: none; transition: opacity 380ms ease-out; }
.home-hero.is-film-ready .hero-film { opacity: .98; }
html[data-network="constrained"] .hero-film { display: none; }
/* Service visuals are outside the first viewport. Load them only as they
   approach, keeping the first network burst reserved for useful content. */
.capability-card.product,
.capability-card.infrastructure,
.capability-card.observability { background-image: none; }
.capability-card.product.is-cover-ready { background-image: url("https://img.kaelith.tw/assets/brand/product-engineering-v250-1280.webp"); }
.capability-card.infrastructure.is-cover-ready { background-image: url("https://img.kaelith.tw/assets/brand/infrastructure-v250-1280.webp"); }
.capability-card.observability.is-cover-ready { background-image: url("https://img.kaelith.tw/assets/brand/observability-v250-1280.webp"); }
.contact-page-list { display: grid; margin-bottom: 30px; border-top: 1px solid var(--line); }
.contact-page-list a { display: grid; grid-template-columns: minmax(0,1fr) auto; gap: 18px; padding: 19px 0; border-bottom: 1px solid var(--line); transition: color .2s ease, padding-left .2s ease; }
.contact-page-list a:hover { padding-left: 10px; color: var(--blue); }
.contact-page-list span { color: var(--ink-soft); }
.page-services { --page-image: url("https://img.kaelith.tw/assets/brand/product-engineering-v250.webp"); }
.page-principles { --page-image: url("https://img.kaelith.tw/assets/brand/security-visual-v250.webp"); }
.page-contact { --page-image: url("https://img.kaelith.tw/assets/brand/observability-v250.webp"); }
@media (max-width: 980px) {
  .site-header { background: #f6f8fb !important; backdrop-filter: none; }
  .primary-nav { z-index: 250; background: #061522 !important; background-image: linear-gradient(155deg, #09283d, #030d16) !important; box-shadow: -18px 0 48px rgba(2,12,20,.25); }
  .article-feature-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 720px) {
  .home-hero { min-height: 670px; background-image: url("https://img.kaelith.tw/assets/brand/hero-film-v265-768.webp") !important; background-position: 46% center; }
  .home-hero::before { background: linear-gradient(0deg, rgba(3,14,24,.94) 0%, rgba(3,14,24,.75) 39%, rgba(3,14,24,.22) 78%, rgba(3,14,24,.08) 100%); }
  .home-hero-content { max-width: none; }
  .home-hero h1 { max-width: 430px; font-size: clamp(2.6rem, 11.2vw, 3.8rem); letter-spacing: -.055em; }
  .section-heading { grid-template-columns: 1fr; gap: 14px; }
  .section-heading h2 { max-width: 620px; font-size: clamp(2rem, 9.6vw, 3.3rem); }
  .article-showcase-head { grid-template-columns: 1fr; }
  .article-index-link { width: max-content; }
  .article-feature-grid { grid-template-columns: 1fr; }
  .article-feature-grid .article-card { min-height: 370px; }
  .contact-page-list a { grid-template-columns: 1fr; gap: 3px; }
  .capability-card.product.is-cover-ready { background-image: url("https://img.kaelith.tw/assets/brand/product-engineering-v250-768.webp"); }
  .capability-card.infrastructure.is-cover-ready { background-image: url("https://img.kaelith.tw/assets/brand/infrastructure-v250-768.webp"); }
  .capability-card.observability.is-cover-ready { background-image: url("https://img.kaelith.tw/assets/brand/observability-v250-768.webp"); }
  .page-services { --page-image: url("https://img.kaelith.tw/assets/brand/product-engineering-v250-768.webp"); }
  .page-principles { --page-image: url("https://img.kaelith.tw/assets/brand/security-visual-v250-768.webp"); }
  .page-contact { --page-image: url("https://img.kaelith.tw/assets/brand/observability-v250-768.webp"); }
}
@media (prefers-reduced-motion: reduce) {
  .hero-film { display: none; }
}

/* GENERATED ARTICLE COVERS */
.article-masthead-cover.cover-2fa-recovery-codes, .article-card.cover-2fa-recovery-codes.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/2fa-recovery-codes-1200.webp"); }
.article-masthead-cover.cover-access-control-idor, .article-card.cover-access-control-idor.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/access-control-idor-1200.webp"); }
.article-masthead-cover.cover-account-compromise-response, .article-card.cover-account-compromise-response.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/account-compromise-response-1200.webp"); }
.article-masthead-cover.cover-app-permission-safety, .article-card.cover-app-permission-safety.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/app-permission-safety-1200.webp"); }
.article-masthead-cover.cover-browser-extension-safety, .article-card.cover-browser-extension-safety.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/browser-extension-safety-1200.webp"); }
.article-masthead-cover.cover-cloud-sharing-privacy, .article-card.cover-cloud-sharing-privacy.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/cloud-sharing-privacy-1200.webp"); }
.article-masthead-cover.cover-content-security-policy, .article-card.cover-content-security-policy.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/content-security-policy-1200.webp"); }
.article-masthead-cover.cover-csrf-protection, .article-card.cover-csrf-protection.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/csrf-protection-1200.webp"); }
.article-masthead-cover.cover-data-breach-response, .article-card.cover-data-breach-response.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/data-breach-response-1200.webp"); }
.article-masthead-cover.cover-dns-basics, .article-card.cover-dns-basics.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/dns-basics-1200.webp"); }
.article-masthead-cover.cover-domain-dns-takeover, .article-card.cover-domain-dns-takeover.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/domain-dns-takeover-1200.webp"); }
.article-masthead-cover.cover-email-dns-security, .article-card.cover-email-dns-security.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/email-dns-security-1200.webp"); }
.article-masthead-cover.cover-online-shopping-security, .article-card.cover-online-shopping-security.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/online-shopping-security-1200.webp"); }
.article-masthead-cover.cover-password-manager, .article-card.cover-password-manager.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/password-manager-1200.webp"); }
.article-masthead-cover.cover-phishing, .article-card.cover-phishing.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/phishing-1200.webp"); }
.article-masthead-cover.cover-public-wifi, .article-card.cover-public-wifi.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/public-wifi-1200.webp"); }
.article-masthead-cover.cover-qr-code-safety, .article-card.cover-qr-code-safety.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/qr-code-safety-1200.webp"); }
.article-masthead-cover.cover-responsible-vulnerability-disclosure, .article-card.cover-responsible-vulnerability-disclosure.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/responsible-vulnerability-disclosure-1200.webp"); }
.article-masthead-cover.cover-scam-message-safety, .article-card.cover-scam-message-safety.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/scam-message-safety-1200.webp"); }
.article-masthead-cover.cover-secure-file-upload, .article-card.cover-secure-file-upload.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/secure-file-upload-1200.webp"); }
.article-masthead-cover.cover-security-incident-reporting, .article-card.cover-security-incident-reporting.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/security-incident-reporting-1200.webp"); }
.article-masthead-cover.cover-security-logging-monitoring, .article-card.cover-security-logging-monitoring.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/security-logging-monitoring-1200.webp"); }
.article-masthead-cover.cover-self-xss, .article-card.cover-self-xss.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/self-xss-1200.webp"); }
.article-masthead-cover.cover-service-worker-cache-security, .article-card.cover-service-worker-cache-security.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/service-worker-cache-security-1200.webp"); }
.article-masthead-cover.cover-session-cookie-security, .article-card.cover-session-cookie-security.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/session-cookie-security-1200.webp"); }
.article-masthead-cover.cover-social-engineering, .article-card.cover-social-engineering.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/social-engineering-1200.webp"); }
.article-masthead-cover.cover-software-supply-chain, .article-card.cover-software-supply-chain.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/software-supply-chain-1200.webp"); }
.article-masthead-cover.cover-ssl-certificate, .article-card.cover-ssl-certificate.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/ssl-certificate-1200.webp"); }
.article-masthead-cover.cover-two-factor-authentication, .article-card.cover-two-factor-authentication.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/two-factor-authentication-1200.webp"); }
.article-masthead-cover.cover-website-backup, .article-card.cover-website-backup.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/website-backup-1200.webp"); }
.article-masthead-cover.cover-website-maintenance-checklist, .article-card.cover-website-maintenance-checklist.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/website-maintenance-checklist-1200.webp"); }
.article-masthead-cover.cover-website-malware, .article-card.cover-website-malware.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/website-malware-1200.webp"); }
.article-masthead-cover.cover-xss-prevention, .article-card.cover-xss-prevention.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/xss-prevention-1200.webp"); }
@media (max-width: 720px) {
  .article-masthead-cover.cover-2fa-recovery-codes, .article-card.cover-2fa-recovery-codes.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/2fa-recovery-codes-720.webp"); }
  .article-masthead-cover.cover-access-control-idor, .article-card.cover-access-control-idor.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/access-control-idor-720.webp"); }
  .article-masthead-cover.cover-account-compromise-response, .article-card.cover-account-compromise-response.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/account-compromise-response-720.webp"); }
  .article-masthead-cover.cover-app-permission-safety, .article-card.cover-app-permission-safety.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/app-permission-safety-720.webp"); }
  .article-masthead-cover.cover-browser-extension-safety, .article-card.cover-browser-extension-safety.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/browser-extension-safety-720.webp"); }
  .article-masthead-cover.cover-cloud-sharing-privacy, .article-card.cover-cloud-sharing-privacy.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/cloud-sharing-privacy-720.webp"); }
  .article-masthead-cover.cover-content-security-policy, .article-card.cover-content-security-policy.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/content-security-policy-720.webp"); }
  .article-masthead-cover.cover-csrf-protection, .article-card.cover-csrf-protection.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/csrf-protection-720.webp"); }
  .article-masthead-cover.cover-data-breach-response, .article-card.cover-data-breach-response.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/data-breach-response-720.webp"); }
  .article-masthead-cover.cover-dns-basics, .article-card.cover-dns-basics.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/dns-basics-720.webp"); }
  .article-masthead-cover.cover-domain-dns-takeover, .article-card.cover-domain-dns-takeover.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/domain-dns-takeover-720.webp"); }
  .article-masthead-cover.cover-email-dns-security, .article-card.cover-email-dns-security.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/email-dns-security-720.webp"); }
  .article-masthead-cover.cover-online-shopping-security, .article-card.cover-online-shopping-security.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/online-shopping-security-720.webp"); }
  .article-masthead-cover.cover-password-manager, .article-card.cover-password-manager.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/password-manager-720.webp"); }
  .article-masthead-cover.cover-phishing, .article-card.cover-phishing.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/phishing-720.webp"); }
  .article-masthead-cover.cover-public-wifi, .article-card.cover-public-wifi.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/public-wifi-720.webp"); }
  .article-masthead-cover.cover-qr-code-safety, .article-card.cover-qr-code-safety.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/qr-code-safety-720.webp"); }
  .article-masthead-cover.cover-responsible-vulnerability-disclosure, .article-card.cover-responsible-vulnerability-disclosure.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/responsible-vulnerability-disclosure-720.webp"); }
  .article-masthead-cover.cover-scam-message-safety, .article-card.cover-scam-message-safety.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/scam-message-safety-720.webp"); }
  .article-masthead-cover.cover-secure-file-upload, .article-card.cover-secure-file-upload.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/secure-file-upload-720.webp"); }
  .article-masthead-cover.cover-security-incident-reporting, .article-card.cover-security-incident-reporting.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/security-incident-reporting-720.webp"); }
  .article-masthead-cover.cover-security-logging-monitoring, .article-card.cover-security-logging-monitoring.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/security-logging-monitoring-720.webp"); }
  .article-masthead-cover.cover-self-xss, .article-card.cover-self-xss.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/self-xss-720.webp"); }
  .article-masthead-cover.cover-service-worker-cache-security, .article-card.cover-service-worker-cache-security.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/service-worker-cache-security-720.webp"); }
  .article-masthead-cover.cover-session-cookie-security, .article-card.cover-session-cookie-security.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/session-cookie-security-720.webp"); }
  .article-masthead-cover.cover-social-engineering, .article-card.cover-social-engineering.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/social-engineering-720.webp"); }
  .article-masthead-cover.cover-software-supply-chain, .article-card.cover-software-supply-chain.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/software-supply-chain-720.webp"); }
  .article-masthead-cover.cover-ssl-certificate, .article-card.cover-ssl-certificate.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/ssl-certificate-720.webp"); }
  .article-masthead-cover.cover-two-factor-authentication, .article-card.cover-two-factor-authentication.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/two-factor-authentication-720.webp"); }
  .article-masthead-cover.cover-website-backup, .article-card.cover-website-backup.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/website-backup-720.webp"); }
  .article-masthead-cover.cover-website-maintenance-checklist, .article-card.cover-website-maintenance-checklist.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/website-maintenance-checklist-720.webp"); }
  .article-masthead-cover.cover-website-malware, .article-card.cover-website-malware.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/website-malware-720.webp"); }
  .article-masthead-cover.cover-xss-prevention, .article-card.cover-xss-prevention.is-cover-ready { --cover-image: url("https://img.kaelith.tw/assets/articles/xss-prevention-720.webp"); }
}


/* v2.6.6: service motion is an enhancement over the existing CSS background.
   The original image remains the immediate visual and fallback. */
.capability-grid { position: relative; isolation: isolate; }
.capability-motion-card { overflow: hidden; background-color: #061522; }
.capability-motion-film { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; opacity: 0; transform: scale(1.035); transition: opacity .55s ease, transform 1.2s cubic-bezier(.2,.7,.2,1); pointer-events: none; }
.capability-motion-card.is-motion-ready .capability-motion-film { opacity: .88; transform: scale(1); }
.capability-motion-card::after { z-index: 1; }
.capability-motion-card > div { position: relative; z-index: 3; }
.motion-orbit { position: absolute; z-index: 2; width: 54%; aspect-ratio: 1; border: 1px dashed rgba(137,211,255,.42); border-radius: 50%; right: -17%; top: -18%; pointer-events: none; opacity: 0; transition: opacity .45s ease; animation: capability-orbit 16s linear infinite; }
.capability-motion-card.is-motion-ready .motion-orbit { opacity: .78; }
.motion-orbit::before, .motion-orbit::after { content: ''; position: absolute; width: 6px; height: 6px; border-radius: 50%; background: #8ddbff; box-shadow: 0 0 14px #8ddbff; }
.motion-orbit::before { left: 4%; top: 18%; }.motion-orbit::after { right: 11%; bottom: 8%; }
.motion-orbit-b { animation-duration: 20s; animation-direction: reverse; right: -12%; top: -12%; }.motion-orbit-c { animation-duration: 24s; right: -19%; top: -11%; }
@keyframes capability-orbit { to { transform: rotate(360deg); } }

/* The article navigation must never consume the reading column on a phone. */
@media (max-width: 720px) {
  .article-masthead { padding: 38px 0 22px; }
  .article-masthead h1 { max-width: 100%; font-size: clamp(2rem, 9.4vw, 2.75rem); line-height: 1.12; letter-spacing: -.055em; }
  .article-masthead p { max-width: 100%; font-size: 1rem; }
  .article-masthead-cover { min-height: 210px; margin-top: 22px; }
  .article-layout { display: block; padding-top: 30px; padding-bottom: 68px; }
  .article-aside { position: static; width: auto; max-width: none; margin: 0 0 26px; padding: 0; border: 0; }
  .article-aside > strong { display: block; margin: 0 0 10px; }
  .article-aside nav { display: flex; gap: 8px; overflow-x: auto; overscroll-behavior-inline: contain; margin: 0 -14px; padding: 0 14px 10px; border: 0; scrollbar-width: thin; }
  .article-aside nav a { flex: 0 0 min(70vw, 245px); min-height: 64px; padding: 11px 13px; border: 1px solid var(--line); white-space: normal; line-height: 1.45; }
  .article-content { width: 100%; max-width: none; min-width: 0; }
  .article-content > * { max-width: 100%; }
  .article-section { grid-template-columns: 38px minmax(0, 1fr); gap: 12px; padding: 26px 0; }
  .article-section > :not(.section-number) { min-width: 0; }
  .article-section h2 { font-size: clamp(1.38rem, 7vw, 1.8rem); line-height: 1.24; overflow-wrap: anywhere; }
  .article-content p, .article-content li { font-size: 1rem; line-height: 1.82; overflow-wrap: anywhere; }
  .security-exercise { width: 100%; max-width: 100%; padding: 20px; }
  .security-exercise label { min-width: 0; }
  .capability-grid { grid-template-columns: 1fr; gap: 14px; }
  .capability-motion-card { min-height: 235px; }
  .capability-motion-film { opacity: 0 !important; }
  .motion-orbit { display: none; }
}
@media (prefers-reduced-motion: reduce) { .motion-orbit { animation: none; } .capability-motion-film { transition: none; } }


/* v2.6.7: services become a vertical sequence of editorial motion bands. */
.capabilities.section-shell { width: 100%; max-width: none; padding: 78px 0 94px; }
.capabilities .section-heading { width: min(100% - 48px, 1240px); margin: 0 auto 38px; }
.capability-grid { display: grid; grid-template-columns: 1fr; gap: 18px; width: min(100% - 48px, 1440px); margin: 0 auto; }
.capability-card.capability-motion-card { display: grid; align-items: end; width: 100%; min-height: clamp(420px, 51vw, 610px); padding: clamp(30px, 5vw, 76px); border: 1px solid rgba(158, 203, 231, .24); border-radius: 0; background-size: cover; background-position: center; isolation: isolate; }
.capability-card.capability-motion-card::before { content: ''; position: absolute; inset: 0; z-index: 1; background: linear-gradient(90deg, rgba(2, 13, 24, .96) 0%, rgba(2, 13, 24, .76) 32%, rgba(2, 13, 24, .20) 64%, rgba(2, 13, 24, .02) 100%); }
.capability-card.capability-motion-card::after { content: ''; position: absolute; z-index: 2; inset: 0; border-left: 3px solid #53c7ff; background: linear-gradient(90deg, rgba(83, 199, 255, .10), transparent 34%); pointer-events: none; }
.capability-card.capability-motion-card > div { max-width: 500px; padding: 0; }
.capability-card.capability-motion-card h3 { margin: 10px 0 14px; font-size: clamp(2.1rem, 4.4vw, 4.5rem); line-height: 1.02; letter-spacing: -.055em; color: #fff; }
.capability-card.capability-motion-card p { margin: 0; max-width: 430px; color: #c8d9e6; font-size: clamp(1rem, 1.3vw, 1.14rem); line-height: 1.72; }
.capability-index { color: #91dcff; font-size: .72rem; font-weight: 800; letter-spacing: .14em; }
.capability-motion-film { z-index: 0; opacity: 0; transform: none; transition: opacity .7s ease; }
.capability-motion-card.is-motion-ready .capability-motion-film { opacity: 1; transform: none; }
.capability-motion-card .motion-orbit { display: none; }
.capability-card.capability-motion-card.infrastructure::before { background: linear-gradient(90deg, rgba(2, 13, 24, .96) 0%, rgba(2, 13, 24, .76) 32%, rgba(2, 13, 24, .25) 69%, rgba(2, 13, 24, .02) 100%); }

@media (max-width: 720px) {
  .capabilities.section-shell { padding: 52px 0 62px; }
  .capabilities .section-heading, .capability-grid { width: min(100% - 28px, 720px); }
  .capabilities .section-heading { margin-bottom: 24px; }
  .capability-grid { gap: 12px; }
  .capability-card.capability-motion-card { min-height: 340px; padding: 26px 22px; background-position: 62% center; }
  .capability-card.capability-motion-card h3 { font-size: clamp(2rem, 11vw, 3rem); }
  .capability-card.capability-motion-card p { font-size: .98rem; }
  .capability-motion-film { opacity: 0 !important; }
}


/* v2.6.8: restrained editorial motion. Only composited properties animate. */
:root { --motion-out: cubic-bezier(.22, 1, .36, 1); --motion-soft: cubic-bezier(.16, 1, .3, 1); }
html { scroll-behavior: smooth; }
.site-header { transition: background-color .42s var(--motion-soft), border-color .42s var(--motion-soft), box-shadow .42s var(--motion-soft); }
.site-header.is-condensed { background-color: rgba(247, 250, 252, .96); border-bottom-color: rgba(9, 36, 56, .14); box-shadow: 0 8px 26px rgba(4, 20, 34, .055); }
.reveal { transform: translate3d(0, 20px, 0); transition: opacity .78s var(--motion-out), transform .78s var(--motion-out); }
.reveal:not(.is-visible) { will-change: opacity, transform; }
.js .reveal > h1, .js .reveal > h2, .js .reveal > h3 { clip-path: inset(0 0 105% 0); transform: translate3d(0, 14px, 0); transition: clip-path .86s var(--motion-out), transform .86s var(--motion-out); }
.js .reveal.is-visible > h1, .js .reveal.is-visible > h2, .js .reveal.is-visible > h3 { clip-path: inset(0 0 0 0); transform: none; }
.js .reveal > p, .js .reveal > .article-meta, .js .reveal > .hero-actions { transition: opacity .58s var(--motion-out) .12s, transform .58s var(--motion-out) .12s; }
.js .reveal:not(.is-visible) > p, .js .reveal:not(.is-visible) > .article-meta, .js .reveal:not(.is-visible) > .hero-actions { opacity: 0; transform: translate3d(0, 10px, 0); }
.reveal-step-2 { transition-delay: .07s; }.reveal-step-3 { transition-delay: .14s; }.reveal-step-4 { transition-delay: .21s; }.reveal-step-5 { transition-delay: .28s; }
.js .motion-ready .home-hero-content > .eyebrow, .js .motion-ready .home-hero-content > h1, .js .motion-ready .home-hero-content > p, .js .motion-ready .home-hero-content > .hero-actions { animation: hero-copy-in .82s var(--motion-out) both; }
.js .motion-ready .home-hero-content > h1 { animation-delay: .08s; }.js .motion-ready .home-hero-content > p { animation-delay: .18s; }.js .motion-ready .home-hero-content > .hero-actions { animation-delay: .28s; }
@keyframes hero-copy-in { from { opacity: 0; transform: translate3d(0, 18px, 0); } to { opacity: 1; transform: none; } }
.article-card, .capability-card { transition: outline-color .28s var(--motion-soft), background-color .28s var(--motion-soft); }
.article-card:hover, .capability-card:hover { transform: none; }
.content-section, .article-document { content-visibility: auto; contain-intrinsic-size: auto 900px; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .site-header, .reveal, .js .reveal > h1, .js .reveal > h2, .js .reveal > h3, .js .reveal > p, .js .reveal > .article-meta, .js .reveal > .hero-actions { transition: none !important; }
  .js .motion-ready .home-hero-content > * { animation: none !important; }
}


/* v2.6.9: page-wide editorial motion system. */
.js .motion-section { position: relative; opacity: 0; transform: translate3d(0, 28px, 0); transition: opacity .86s var(--motion-out), transform .86s var(--motion-out); }
.js .motion-section:not(.is-inview) { will-change: opacity, transform; }
.js .motion-section.is-inview { opacity: 1; transform: none; }
.js .motion-section::after { content: ''; position: absolute; left: 0; top: 0; width: min(84px, 14vw); height: 1px; background: currentColor; opacity: .18; transform: scaleX(0); transform-origin: left; transition: transform .82s var(--motion-out) .08s; }
.js .motion-section.is-inview::after { transform: scaleX(1); }
.js .motion-heading { clip-path: inset(0 0 110% 0); transform: translate3d(0, 18px, 0); transition: clip-path .9s var(--motion-out) .05s, transform .9s var(--motion-out) .05s; }
.js .motion-section.is-inview .motion-heading { clip-path: inset(0 0 0 0); transform: none; }
.js .motion-paragraph, .js .motion-action { opacity: 0; transform: translate3d(0, 12px, 0); transition: opacity .62s var(--motion-out) .18s, transform .62s var(--motion-out) .18s; }
.js .motion-section.is-inview .motion-paragraph, .js .motion-section.is-inview .motion-action { opacity: 1; transform: none; }
.js .motion-card { opacity: 0; transform: translate3d(0, 24px, 0); transition: opacity .68s var(--motion-out), transform .68s var(--motion-out), border-color .3s var(--motion-soft); }
.js .motion-section.is-inview .motion-card { opacity: 1; transform: none; }
.js .motion-section.is-inview .motion-card:nth-child(2) { transition-delay: .08s; }.js .motion-section.is-inview .motion-card:nth-child(3) { transition-delay: .16s; }.js .motion-section.is-inview .motion-card:nth-child(4) { transition-delay: .24s; }.js .motion-section.is-inview .motion-card:nth-child(5) { transition-delay: .32s; }
.js .article-section.motion-section { transform: translate3d(0, 22px, 0); }.js .article-section.motion-section:nth-of-type(even) { transform: translate3d(18px, 22px, 0); }
.js .article-section.motion-section.is-inview { transform: none; }
.article-aside nav a, .filter-button, .icon-button, .contact-page-list a { transition: color .24s var(--motion-soft), background-color .24s var(--motion-soft), border-color .24s var(--motion-soft), transform .24s var(--motion-soft); }
@media (hover: hover) and (pointer: fine) {
  .article-aside nav a:hover, .filter-button:hover, .icon-button:hover { transform: translate3d(0, -2px, 0); }
  .article-index-link:hover .icon, .hero-actions a:hover .icon { transform: translate3d(4px, 0, 0); }
  .contact-page-list a:hover { transform: translate3d(8px, 0, 0); }
}

@media (prefers-reduced-motion: reduce) {
  .js .motion-section, .js .motion-heading, .js .motion-paragraph, .js .motion-action, .js .motion-card, .js .article-section.motion-section { opacity: 1 !important; clip-path: none !important; transform: none !important; transition: none !important; }
  .js .motion-section::after { transform: scaleX(1); transition: none; }
}