/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { font-family: 'PingFang TC', 'Microsoft JhengHei', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif; color: #d0d8e8; line-height: 1.75; background: #0b0f1a; -webkit-font-smoothing: antialiased; }
a { text-decoration: none; color: inherit; transition: color .2s; -webkit-tap-highlight-color: rgba(37,99,235,.25); }
img { max-width: 100%; display: block; }
ul { list-style: none; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 32px; }

/* ===== Top Bar ===== */
.topbar { background: #070a14; border-bottom: 1px solid rgba(255,255,255,.06); font-size: 12px; padding: 7px 0; }
.topbar .container { display: flex; justify-content: space-between; align-items: center; }
.topbar-l { display: flex; gap: 20px; color: #4a5568; }
.topbar-r { display: flex; gap: 16px; }
.topbar-r a { color: #4a5568; }
.topbar-r a:hover { color: #e2e8f0; }

/* ===== Header ===== */
.hdr { background: rgba(11,15,26,.96); backdrop-filter: blur(16px); border-bottom: 1px solid rgba(255,255,255,.06); position: sticky; top: 0; z-index: 100; }
.hdr .container { display: flex; justify-content: space-between; align-items: center; height: 68px; }
.logo { display: flex; align-items: center; }
.logo img { height: 34px; }
.nav { display: flex; gap: 0; align-items: center; }
.nav > li { position: relative; }
.nav > li > a, .nav > li > button { background: none; border: none; color: #8896ab; font-size: 13.5px; font-weight: 500; padding: 22px 15px; cursor: pointer; font-family: inherit; display: flex; align-items: center; gap: 4px; }
.nav > li > a:hover, .nav > li > button:hover { color: #fff; }
.nav > li > .arr { font-size: 8px; opacity: .4; }
.nav > li:hover .arr { transform: rotate(180deg); }
.dd { display: none; position: absolute; top: 100%; left: 0; background: #111728; border: 1px solid rgba(255,255,255,.07); min-width: 200px; border-radius: 0 0 8px 8px; box-shadow: 0 16px 48px rgba(0,0,0,.5); }
.nav > li:hover .dd, .nav > li:focus-within .dd { display: block; }
.dd a { display: block; padding: 10px 18px; color: #7a869e; font-size: 13px; border-bottom: 1px solid rgba(255,255,255,.04); }
.dd a:last-child { border-bottom: none; }
.dd a:hover { background: rgba(255,255,255,.03); color: #e2e8f0; }
.nav-cta { margin-left: 10px; }
.nav-cta > a { background: #2563eb !important; color: #fff !important; padding: 8px 20px !important; border-radius: 4px !important; font-weight: 600 !important; }
.nav-cta > a:hover { background: #3b82f6 !important; }
.mob { display: none; background: none; border: none; color: #fff; font-size: 24px; cursor: pointer; }

/* ===== Hero ===== */
.hero { position: relative; background: #0b0f1a; overflow: hidden; }
.hero-bg { position: absolute; inset: 0; background: url('https://hkcorexcom.cn-hongkong.oss.aliyuncs.com/2025/02/data-center-layers.gif') center/cover no-repeat; opacity: .12; }
.hero-overlay { position: absolute; inset: 0; background: linear-gradient(180deg, rgba(11,15,26,.4) 0%, rgba(11,15,26,.85) 60%, #0b0f1a 100%); }
.hero .container { position: relative; z-index: 1; padding: 80px 32px 72px; }
.hero-tag { display: inline-block; font-size: 11px; font-weight: 600; letter-spacing: 2px; text-transform: uppercase; color: #60a5fa; margin-bottom: 20px; }
.hero h1 { font-size: 48px; font-weight: 700; color: #fff; line-height: 1.2; margin-bottom: 18px; letter-spacing: -.5px; }
.hero h1 span { color: #60a5fa; }
.hero h1 em { font-style: normal; color: #60a5fa; }
.hero-desc { font-size: 16px; color: #7a869e; max-width: 640px; line-height: 1.8; margin-bottom: 32px; }
.hero-btns { display: flex; gap: 12px; flex-wrap: wrap; }
.btn { display: inline-flex; align-items: center; gap: 6px; padding: 12px 28px; font-size: 14px; font-weight: 600; border-radius: 4px; border: none; cursor: pointer; transition: all .2s; }
.btn-blue { background: #2563eb; color: #fff; }
.btn-blue:hover { background: #3b82f6; }
.btn-ghost { background: transparent; color: #8896ab; border: 1px solid rgba(255,255,255,.12); }
.btn-ghost:hover { border-color: #60a5fa; color: #60a5fa; }
.hero-metrics { display: flex; gap: 48px; margin-top: 56px; padding-top: 32px; border-top: 1px solid rgba(255,255,255,.06); flex-wrap: wrap; }
.hero-metric b { display: block; font-size: 32px; font-weight: 700; color: #fff; }
.hero-metric span { font-size: 13px; color: #4a5568; }

/* ===== Section ===== */
.sec { padding: 80px 0; }
.sec-t { padding: 80px 0 0; }
.sec-head { margin-bottom: 48px; }
.sec-head h2 { font-size: 28px; font-weight: 700; color: #fff; margin-bottom: 10px; }
.sec-head p { color: #5a6478; font-size: 15px; }

/* ===== Grid ===== */
.g { display: grid; gap: 20px; }
.g2 { grid-template-columns: repeat(2, 1fr); }
.g3 { grid-template-columns: repeat(3, 1fr); }
.g4 { grid-template-columns: repeat(4, 1fr); }

/* ===== Card - NO fancy effects ===== */
.c { background: #111728; border: 1px solid rgba(255,255,255,.06); border-radius: 6px; padding: 28px; }
.c h3 { font-size: 16px; font-weight: 600; color: #e2e8f0; margin-bottom: 8px; }
.c p { color: #6b7a90; font-size: 14px; line-height: 1.7; }
.c a { color: #60a5fa; font-size: 13px; font-weight: 500; }
.c a:hover { color: #93bbfc; }

/* ===== Server row ===== */
.srv { display: flex; align-items: center; gap: 20px; }
.srv img { width: 56px; height: 38px; object-fit: contain; border-radius: 4px; }

/* ===== Table ===== */
.tbl { overflow-x: auto; border-radius: 6px; border: 1px solid rgba(255,255,255,.06); background: #111728; }
.tbl table { width: 100%; border-collapse: collapse; }
.tbl th { background: #0d1220; color: #5a6478; padding: 12px 16px; text-align: left; font-size: 12px; font-weight: 600; text-transform: uppercase; letter-spacing: .5px; border-bottom: 1px solid rgba(255,255,255,.06); white-space: nowrap; }
.tbl td { padding: 12px 16px; border-bottom: 1px solid rgba(255,255,255,.03); font-size: 13.5px; color: #b0bcd0; white-space: nowrap; }
.tbl tr:last-child td { border-bottom: none; }
.tbl tr:hover td { background: rgba(255,255,255,.02); }
.tbl .pr { color: #60a5fa; font-weight: 600; }
.tbl .ob { display: inline-block; padding: 5px 16px; background: #2563eb; color: #fff; border-radius: 4px; font-size: 12px; font-weight: 600; }
.tbl .ob:hover { background: #3b82f6; }

/* ===== Tabs ===== */
.tabs { display: flex; border-bottom: 1px solid rgba(255,255,255,.06); margin-bottom: 28px; overflow-x: auto; }
.tab { padding: 12px 20px; background: none; border: none; border-bottom: 2px solid transparent; color: #4a5568; font-size: 13px; font-weight: 500; cursor: pointer; white-space: nowrap; font-family: inherit; }
.tab:hover { color: #8896ab; }
.tab.on { color: #60a5fa; border-bottom-color: #60a5fa; }
.tp { display: none; }
.tp.on { display: block; }

/* ===== Stat row ===== */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: rgba(255,255,255,.06); border-radius: 6px; overflow: hidden; }
.stat { background: #111728; padding: 36px 24px; text-align: center; }
.stat b { display: block; font-size: 36px; font-weight: 700; color: #fff; }
.stat span { font-size: 13px; color: #4a5568; margin-top: 4px; display: block; }

/* ===== Partner logos ===== */
.partners { display: flex; flex-wrap: wrap; background: #fff; border-radius: 6px; overflow: hidden; }
.partner { background: #fff; flex: 1 1 22%; padding: 26px 0; display: flex; align-items: center; justify-content: center; min-height: 88px; }
.partner img { max-height: 34px; max-width: 132px; object-fit: contain; transition: all .3s; }

/* ===== Contact ===== */
.cgrid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.cc { background: #111728; border: 1px solid rgba(255,255,255,.06); border-radius: 6px; padding: 24px; display: flex; gap: 14px; }
.cc-icon { width: 44px; height: 44px; border-radius: 6px; background: rgba(37,99,235,.1); color: #60a5fa; display: flex; align-items: center; justify-content: center; font-size: 18px; flex-shrink: 0; }
.cc h4 { font-size: 14px; font-weight: 600; color: #e2e8f0; margin-bottom: 3px; }
.cc p { color: #6b7a90; font-size: 13px; }

/* ===== Footer ===== */
.ft { background: #070a14; border-top: 1px solid rgba(255,255,255,.06); padding: 52px 0 0; }
.ft-g { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.ft h4 { color: #e2e8f0; font-size: 14px; font-weight: 600; margin-bottom: 16px; }
.ft-brand p { color: #4a5568; font-size: 13px; line-height: 1.7; margin-bottom: 12px; }
.ft-brand .slogan { color: #60a5fa; font-size: 13px; font-style: italic; }
.ft ul li { margin-bottom: 8px; }
.ft ul li a { color: #4a5568; font-size: 13px; }
.ft ul li a:hover { color: #60a5fa; }
.ft-btm { border-top: 1px solid rgba(255,255,255,.04); padding: 18px 0; text-align: center; font-size: 12px; color: #2d3748; }
.ft-social { display: flex; gap: 8px; margin-top: 12px; }
.ft-social a { width: 32px; height: 32px; border-radius: 4px; background: rgba(255,255,255,.04); display: flex; align-items: center; justify-content: center; color: #4a5568; font-size: 12px; }
.ft-social a:hover { background: rgba(37,99,235,.15); color: #60a5fa; }

/* ===== Float ===== */
.fl { position: fixed; right: 20px; bottom: 20px; display: flex; flex-direction: column; gap: 8px; z-index: 99; }
.fl a { width: 44px; height: 44px; border-radius: 6px; display: flex; align-items: center; justify-content: center; color: #fff; font-size: 18px; box-shadow: 0 4px 12px rgba(0,0,0,.4); }
.fl a:hover { transform: translateY(-2px); }
.fl-wa { background: #25d366; }
.fl-tg { background: #0088cc; }

/* ===== Article ===== */
.art { background: #111728; border: 1px solid rgba(255,255,255,.06); border-radius: 6px; overflow: hidden; }
.art-body { padding: 24px; }
.art-date { font-size: 12px; color: #4a5568; margin-bottom: 8px; }
.art h3 { font-size: 16px; font-weight: 600; color: #e2e8f0; margin-bottom: 8px; line-height: 1.5; }
.art p { color: #6b7a90; font-size: 13px; line-height: 1.7; }
.art-body a { color: #60a5fa; font-size: 13px; font-weight: 500; display: inline-block; margin-top: 10px; }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .g4 { grid-template-columns: repeat(2, 1fr); }
  .ft-g { grid-template-columns: repeat(2, 1fr); }
  .stats { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .container { padding: 0 16px; }
  .hdr .container { height: 60px; }
  .nav { display: none; position: absolute; top: 60px; left: 0; right: 0; background: #0d1220; border-bottom: 1px solid rgba(255,255,255,.06); flex-direction: column; padding: 8px 16px 16px; max-height: calc(100vh - 60px); max-height: calc(100dvh - 60px); overflow-y: auto; -webkit-overflow-scrolling: touch; }
  .nav.open { display: flex; }
  .nav > li > a, .nav > li > button { padding: 12px 0; min-height: 44px; width: 100%; justify-content: space-between; }
  .nav-cta { margin-left: 0; margin-top: 8px; }
  .nav-cta > a { justify-content: center; min-height: 44px; display: flex !important; align-items: center; padding: 12px 20px !important; border-radius: 6px !important; }
  .dd { position: static; box-shadow: none; background: rgba(255,255,255,.02); border-radius: 4px; margin-top: 4px; margin-bottom: 6px; }
  .dd a { display: flex; align-items: center; min-height: 44px; padding: 10px 16px; font-size: 14px; }
  .mob { display: block; padding: 8px; margin: -8px -8px -8px 0; }
  .hero .container { padding: 48px 16px 44px; }
  .hero h1 { font-size: clamp(26px, 7vw, 30px); letter-spacing: 0; }
  .hero-desc { font-size: 14px; line-height: 1.75; }
  .hero-btns .btn { flex: 1; justify-content: center; min-height: 44px; }
  .hero-metrics { display: grid; grid-template-columns: 1fr 1fr; gap: 20px 16px; margin-top: 40px; padding-top: 24px; }
  .hero-metric b { font-size: 24px; }
  .g2, .g3, .g4 { grid-template-columns: 1fr; }
  .cgrid { grid-template-columns: 1fr; }
  .ft-g { grid-template-columns: 1fr; gap: 28px; }
  .stats { grid-template-columns: 1fr 1fr; }
  .stat { padding: 24px 16px; }
  .stat b { font-size: 28px; }
  .sec { padding: 48px 0; }
  .sec-head { margin-bottom: 32px; }
  .sec-head h2 { font-size: 22px; }
  .sec-head p { font-size: 14px; }
  .c { padding: 20px; }
  .topbar { display: none; }
  .tbl { -webkit-overflow-scrolling: touch; }
  .tbl th, .tbl td { padding: 10px 12px; font-size: 13px; }
  .tbl .ob { display: inline-flex; align-items: center; min-height: 36px; padding: 6px 14px; }
  .tab { padding: 14px 16px; font-size: 14px; min-height: 48px; }
  .btn { min-height: 44px; }
  .btn:active, .tbl .ob:active { transform: scale(.97); }
  .srv { flex-wrap: wrap; gap: 14px; }
  .art-body { padding: 20px; }
  .cc { padding: 20px; }
  .cc p { word-break: break-word; }
  .partner { flex: 1 1 33%; min-height: 76px; padding: 20px 8px; }
  .partner img { max-height: 28px; max-width: 104px; }
  .fl { right: 14px; bottom: calc(14px + env(safe-area-inset-bottom, 0px)); }
  .fl a { width: 46px; height: 46px; }
  .ft-btm { font-size: 11px; }
}
@media (min-width: 481px) and (max-width: 768px) {
  .g3, .g4 { grid-template-columns: repeat(2, 1fr); }
  .cgrid { grid-template-columns: repeat(2, 1fr); }
  .ft-g { grid-template-columns: repeat(2, 1fr); }
  .partner { flex: 1 1 22%; }
  .partner img { max-height: 34px; max-width: 132px; }
}
@media (max-width: 480px) {
  .partner { flex: 1 1 50%; }
  .hero-metrics { gap: 16px 12px; }
  .hero-metric b { font-size: 22px; }
  .hero-metric span { font-size: 12px; }
}

/* ===== Knowledge center (v3.5) ===== */
.hero.hero-sm .container { padding: 56px 32px 48px; }
.hero.hero-sm h1 { font-size: clamp(24px, 4vw, 34px); letter-spacing: -.3px; }
.crumb { font-size: 13px; color: #5a6478; margin-bottom: 14px; }
.crumb a { color: #60a5fa; }
.crumb a:hover { color: #93c5fd; }
.crumb i { font-style: normal; color: #3d4657; margin: 0 6px; }

.chips { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 36px; }
.chip { font-size: 13px; color: #8b97ab; background: #111728; border: 1px solid rgba(255,255,255,.08); border-radius: 999px; padding: 8px 18px; min-height: 36px; cursor: pointer; font-family: inherit; transition: all .2s; }
.chip:hover { color: #e2e8f0; border-color: rgba(96,165,250,.4); }
.chip.on { color: #fff; background: #2563eb; border-color: #2563eb; }

.art { transition: border-color .25s; }
.art:hover { border-color: rgba(96,165,250,.35); }
.art-thumb { display: block; aspect-ratio: 16/9; overflow: hidden; background: #0d1220; border-bottom: 1px solid rgba(255,255,255,.06); }
.art-thumb img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform .35s; }
.art:hover .art-thumb img { transform: scale(1.04); }
.art-cat { display: inline-block; font-size: 11px; color: #60a5fa; background: rgba(37,99,235,.14); border: 1px solid rgba(96,165,250,.25); border-radius: 4px; padding: 2px 8px; margin-bottom: 10px; letter-spacing: .3px; }

.artc { background: #111728; border: 1px solid rgba(255,255,255,.06); border-radius: 6px; padding: 44px 48px; color: #aab6c8; font-size: 15px; line-height: 1.95; }
.artc > :first-child { margin-top: 0; }
.artc > :last-child { margin-bottom: 0; }
.artc h2 { font-size: 22px; font-weight: 700; color: #fff; margin: 40px 0 16px; line-height: 1.4; }
.artc h3 { font-size: 17px; font-weight: 600; color: #e2e8f0; margin: 28px 0 12px; line-height: 1.5; }
.artc p { margin-bottom: 16px; }
.artc ul, .artc ol { padding-left: 24px; margin-bottom: 16px; }
.artc li { margin-bottom: 8px; }
.artc li::marker { color: #4a5568; }
.artc a { color: #60a5fa; text-decoration: underline; text-underline-offset: 3px; text-decoration-color: rgba(96,165,250,.35); }
.artc a:hover { text-decoration-color: #60a5fa; }
.artc code { background: #0b0f1a; border: 1px solid rgba(255,255,255,.08); border-radius: 4px; padding: 1px 7px; font-size: 13px; color: #93c5fd; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.artc strong { color: #e2e8f0; font-weight: 600; }
.artc img { max-width: 100%; border-radius: 6px; margin: 12px 0; display: block; }
.artc blockquote { border-left: 3px solid #2563eb; padding: 4px 0 4px 18px; margin: 20px 0; color: #8b97ab; }

.art-head-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; margin-top: 18px; font-size: 13px; color: #5a6478; }
.art-head-meta .art-cat { margin-bottom: 0; }

.art-pn { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 32px; }
.art-pn a { display: block; background: #111728; border: 1px solid rgba(255,255,255,.06); border-radius: 6px; padding: 18px 22px; transition: border-color .25s; }
.art-pn a:hover { border-color: rgba(96,165,250,.35); }
.art-pn .lb { font-size: 12px; color: #4a5568; margin-bottom: 6px; display: block; }
.art-pn .tt { font-size: 14px; color: #e2e8f0; font-weight: 500; line-height: 1.5; }
.art-pn .nx { text-align: right; }
.art-pn .ph { border-style: dashed; opacity: .45; }

@media (max-width: 768px) {
  .hero.hero-sm .container { padding: 40px 16px 36px; }
  .artc table { display: block; overflow-x: auto; white-space: nowrap; }
  .artc th, .artc td { padding: 8px 12px; font-size: 13px; }
  .artc { padding: 24px 20px; font-size: 14.5px; line-height: 1.9; }
  .artc h2 { font-size: 19px; margin: 30px 0 12px; }
  .artc h3 { font-size: 16px; }
  .art-pn { grid-template-columns: 1fr; }
  .art-pn .nx { text-align: left; }
  .chips { margin-bottom: 28px; }
}

.artc table { width: 100%; border-collapse: collapse; margin: 18px 0; font-size: 14px; }
.artc th, .artc td { border: 1px solid rgba(255,255,255,.08); padding: 10px 14px; text-align: left; }
.artc th { background: #0b0f1a; color: #e2e8f0; font-weight: 600; white-space: nowrap; }
.artc td { color: #aab6c8; }
.artc tr:nth-child(even) td { background: rgba(255,255,255,.02); }