:root {
  /* 配色来自 Logo：青蓝衬衫 + 奶油肤色 + 核桃棕 + 蜜糖橙黄 */
  --bg: #0a2026;          /* 深青墨 */
  --bg-2: #0f2a31;        /* 深青墨 偏亮 */
  --surface: #ffffff;
  --surface-2: #f7f4ee;   /* 暖奶油白 */
  --surface-3: #fbf5e8;   /* 更暖的奶油底 */
  --border: #ece4d3;      /* 暖中性边线 */
  --border-cool: #d8e6e6; /* 青调边线 */
  --text: #1a2a2e;        /* 深墨青 */
  --text-2: #4a5b5f;
  --muted: #8a8478;       /* 暖灰 */
  --brand: #1f94a4;       /* 主色 — Logo 青蓝（提深以在白底可读） */
  --brand-light: #48b4c0; /* Logo 原色 — 用于高光、装饰 */
  --brand-dark: #146876;  /* 主色暗调 */
  --brand-2: #e8a659;     /* 暖蜜糖橙黄 — 辅助色 */
  --brand-3: #6c543c;     /* 核桃棕 — 深暖色锚 */
  --cream: #fae0b8;       /* 奶油暖光 */
  --brand-grad: linear-gradient(135deg, #48b4c0 0%, #1f94a4 55%, #146876 100%);
  --brand-grad-warm: linear-gradient(135deg, #1f94a4 0%, #48b4c0 45%, #e8a659 100%);
  --warn: #e8a659;
  --danger: #d96552;
  --radius: 14px;
  --radius-lg: 22px;
  --shadow-sm: 0 1px 2px rgba(12,18,48,.06), 0 1px 1px rgba(12,18,48,.04);
  --shadow: 0 8px 24px rgba(12,18,48,.08), 0 2px 4px rgba(12,18,48,.04);
  --shadow-lg: 0 30px 60px -20px rgba(12,18,48,.25), 0 18px 36px -18px rgba(42,109,255,.25);
  --container: 1200px;
  --font-sans: "Inter", "Noto Sans SC", -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  color: var(--text);
  background: #fff;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; display: block; }
a { color: var(--brand); text-decoration: none; }
a:hover { color: #1a52d6; }
button { font-family: inherit; cursor: pointer; }
h1, h2, h3, h4 { line-height: 1.2; letter-spacing: -0.01em; margin: 0 0 .5em; text-wrap: balance; }
h1 { font-size: clamp(2rem, 4.5vw, 3.4rem); font-weight: 800; }
h2 { font-size: clamp(1.6rem, 3vw, 2.4rem); font-weight: 750; }
h3 { font-size: clamp(1.2rem, 2vw, 1.4rem); font-weight: 700; }
p { margin: 0 0 1em; color: var(--text-2); text-wrap: pretty; }
hr { border: 0; border-top: 1px solid var(--border); margin: 2.5rem 0; }

.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }

/* ============ Top Nav ============ */
.topbar {
  position: sticky; top: 0; z-index: 50;
  background: rgba(251,245,232,.86);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid rgba(108,84,60,.10);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  height: 68px;
}
.nav-logo { display: flex; align-items: center; gap: 10px; }
.nav-logo img { height: 30px; width: auto; }
.nav-logo .brand-name {
  font-weight: 800; font-size: 1.15rem; letter-spacing: -.02em;
  background: var(--brand-grad);
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
}
.nav-links { display: flex; align-items: center; gap: 28px; }
.nav-links a {
  color: var(--text); font-weight: 500; font-size: .95rem;
  position: relative; padding: 6px 0;
}
.nav-links a:hover { color: var(--brand); }
.nav-links a.active { color: var(--brand); }
.nav-links a.active::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -4px;
  height: 2px; background: var(--brand-grad); border-radius: 2px;
}
.nav-cta { display: flex; align-items: center; gap: 12px; }
.nav-burger {
  display: none; background: none; border: 0; width: 40px; height: 40px;
  align-items: center; justify-content: center; border-radius: 10px;
}
.nav-burger:hover { background: var(--surface-2); }
.nav-burger svg { width: 22px; height: 22px; stroke: var(--text); }

/* ============ Buttons ============ */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 22px; border-radius: 999px;
  font-size: .95rem; font-weight: 600; border: 1px solid transparent;
  transition: transform .15s ease, box-shadow .2s ease, background .2s ease;
  white-space: nowrap; cursor: pointer; text-decoration: none;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--brand-grad); color: #fff; box-shadow: 0 8px 22px -8px rgba(31,148,164,.55); }
.btn-primary:hover { color: #fff; box-shadow: 0 12px 28px -10px rgba(31,148,164,.75); }
.btn-ghost { background: transparent; color: var(--text); border-color: var(--border); }
.btn-ghost:hover { background: var(--surface-2); }
.btn-dark { background: #6c543c; color: #fff; }
.btn-dark:hover { background: #8b6b4d; color: #fff; }
.btn-warm { background: #e8a659; color: #4a3520; }
.btn-warm:hover { background: #efb673; color: #4a3520; }
.btn-lg { padding: 16px 28px; font-size: 1rem; }
.btn-block { width: 100%; }

/* ============ Hero (Home) ============ */
.hero {
  position: relative; overflow: hidden;
  background: radial-gradient(1200px 600px at 78% -10%, rgba(232,166,89,.20), transparent 60%),
              radial-gradient(900px 500px at 8% 12%, rgba(72,180,192,.28), transparent 60%),
              linear-gradient(180deg, #0a2026 0%, #0f2a31 100%);
  color: #fff;
  padding: 96px 0 120px;
}
.hero::before {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse at 50% 0%, #000 30%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at 50% 0%, #000 30%, transparent 70%);
  pointer-events: none;
}
.hero-grid {
  position: relative; display: grid; grid-template-columns: 1.1fr .9fr; gap: 64px; align-items: center;
}
.hero h1 { color: #fff; }
.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 14px; border-radius: 999px;
  background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.14);
  font-size: .8rem; font-weight: 600; color: #d6e4e6; margin-bottom: 18px;
}
.hero-eyebrow .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--brand-2); box-shadow: 0 0 0 4px rgba(232,166,89,.22); }
.hero p.lede { font-size: 1.15rem; color: #c5d4d6; max-width: 540px; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 28px; }
.hero-stats { display: flex; gap: 36px; margin-top: 48px; flex-wrap: wrap; }
.hero-stats div { color: #c5d4d6; }
.hero-stats strong { display: block; color: #fff; font-size: 1.8rem; font-weight: 800; letter-spacing: -.02em; line-height: 1.1; }

/* ============ Hero Viz (radar + chips) ============ */
.hero-viz {
  position: relative;
  width: 100%;
  max-width: 460px;
  aspect-ratio: 1 / 1;
  margin: 0 auto;
}
.hero-radar {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  filter: drop-shadow(0 18px 40px rgba(72,180,192,.18));
}
@keyframes radarSpin { to { transform: rotate(360deg); } }

.hero-chip {
  position: absolute;
  background: rgba(15,42,49,.72);
  border: 1px solid rgba(72,180,192,.22);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: 14px;
  padding: 12px 16px;
  display: flex; align-items: center; gap: 10px;
  color: #fff;
  box-shadow: 0 18px 32px -16px rgba(0,0,0,.5);
  min-width: 132px;
}
.hero-chip .chip-label {
  font-family: var(--font-mono); font-size: .7rem;
  color: #94b3b7; text-transform: uppercase; letter-spacing: .08em;
  margin-bottom: 2px; font-weight: 500; white-space: nowrap;
}
.hero-chip .chip-value {
  font-size: 1.1rem; font-weight: 800; line-height: 1.1; color: #fff;
  font-feature-settings: "tnum";
}
.hero-chip .chip-value small { font-size: .65rem; color: #94b3b7; font-weight: 600; margin-left: 2px; }
.hero-chip .chip-value-lg { font-size: 1.5rem; }
.hero-chip .chip-icon {
  width: 32px; height: 32px; border-radius: 9px;
  background: rgba(72,180,192,.18); color: var(--brand-light);
  display: flex; align-items: center; justify-content: center; flex-shrink: 0;
}
.hero-chip .chip-icon svg { width: 16px; height: 16px; }
.hero-chip .chip-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: #48b4c0;
  box-shadow: 0 0 0 4px rgba(72,180,192,.22);
  animation: pulse 1.6s ease-in-out infinite;
  flex-shrink: 0;
}
.hero-chip .chip-bars {
  display: flex; align-items: flex-end; gap: 3px;
  height: 22px; margin-top: 6px;
}
.hero-chip .chip-bars span {
  width: 4px; border-radius: 2px;
  background: linear-gradient(180deg, #48b4c0, #1f94a4);
}
.chip-tl { top: 8%; left: -4%; }
.chip-tr { top: 14%; right: -8%; }
.chip-bl { bottom: 10%; left: -6%; }
.chip-br { bottom: 6%; right: -4%; flex-direction: column; align-items: flex-start; gap: 2px; }
.device {
  position: relative; aspect-ratio: 9/16; max-width: 320px; margin: 0 auto;
  background: linear-gradient(145deg, #1a4348 0%, #0a2026 100%);
  border-radius: 38px; padding: 14px;
  box-shadow: var(--shadow-lg), inset 0 1px 0 rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.08);
}
.device-screen {
  position: relative; height: 100%; border-radius: 28px; overflow: hidden;
  background: linear-gradient(180deg, #0f2a31 0%, #163b44 100%);
  display: flex; flex-direction: column;
}
.device-notch {
  position: absolute; left: 50%; top: 10px; transform: translateX(-50%);
  width: 90px; height: 22px; background: #000; border-radius: 999px; z-index: 2;
}
.device-status {
  display: flex; justify-content: space-between; align-items: center;
  padding: 18px 22px 0; font-size: .7rem; color: rgba(255,255,255,.8);
  font-family: var(--font-mono); font-weight: 500;
}
.device-content { padding: 56px 20px 24px; flex: 1; display: flex; flex-direction: column; gap: 16px; }
.shield {
  margin: 8px auto 12px; width: 96px; height: 96px; border-radius: 50%;
  background: conic-gradient(from 180deg, #48b4c0, #e8a659, #1f94a4, #48b4c0);
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 0 0 6px rgba(72,180,192,.18), 0 20px 40px -10px rgba(31,148,164,.55);
  animation: pulse 2.4s ease-in-out infinite;
}
.shield::before {
  content: ""; width: 76px; height: 76px; border-radius: 50%; background: #0f2a31;
  display: block;
}
.shield::after {
  content: ""; position: absolute; width: 36px; height: 42px;
  background: #48b4c0;
  clip-path: polygon(50% 0, 100% 22%, 100% 60%, 50% 100%, 0 60%, 0 22%);
  margin-top: -54px;
}
@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.04); }
}
.device-status-pill {
  align-self: center;
  font-size: .7rem; padding: 4px 12px; border-radius: 999px;
  background: rgba(72,180,192,.16); color: var(--brand-light);
  font-weight: 600; font-family: var(--font-mono);
}
.device-server {
  margin-top: 6px; padding: 12px 14px; border-radius: 14px;
  background: rgba(255,255,255,.05); border: 1px solid rgba(255,255,255,.08);
  color: #fff; font-size: .85rem; display: flex; align-items: center; justify-content: space-between;
}
.device-server small { color: #94a5a8; font-size: .7rem; display: block; }
.device-meter {
  display: flex; gap: 6px; padding: 0 4px; margin-top: 4px;
}
.device-meter span {
  flex: 1; height: 28px; border-radius: 4px;
  background: linear-gradient(180deg, rgba(72,180,192,.8), rgba(31,148,164,.5));
  opacity: .65;
}
.device-meter span:nth-child(1) { height: 12px; }
.device-meter span:nth-child(2) { height: 20px; }
.device-meter span:nth-child(3) { height: 14px; }
.device-meter span:nth-child(5) { height: 18px; }
.device-meter span:nth-child(6) { height: 26px; }
.device-meter span:nth-child(7) { height: 22px; }
.device-meter span:nth-child(8) { height: 10px; }
.device-connect {
  margin-top: auto; padding: 12px; border-radius: 12px;
  background: var(--brand-grad); color: #fff; font-weight: 700; text-align: center;
  font-size: .9rem; box-shadow: 0 10px 24px -8px rgba(31,148,164,.55);
}

/* ============ Section common ============ */
.section { padding: 96px 0; }
.section-title { text-align: center; max-width: 720px; margin: 0 auto 56px; }
.section-title .eyebrow {
  font-size: .8rem; font-weight: 700; letter-spacing: .12em; text-transform: uppercase;
  color: var(--brand); margin-bottom: 12px; display: inline-block;
}
.section-title p { color: var(--text-2); font-size: 1.05rem; }
.section-alt { background: var(--surface-2); }
.section-dark { background: #0a2026; color: #fff; }
.section-dark h2 { color: #fff; }
.section-dark p { color: #c5d4d6; }
.section-dark .section-title .eyebrow { color: var(--brand-light); }

/* ============ Feature Grid ============ */
.features {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.feature {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 28px; transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
}
.feature:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: rgba(31,148,164,.35); }
.feature-icon {
  width: 48px; height: 48px; border-radius: 12px;
  background: linear-gradient(135deg, rgba(72,180,192,.16), rgba(232,166,89,.16));
  color: var(--brand); display: flex; align-items: center; justify-content: center;
  margin-bottom: 18px;
}
.feature-icon svg { width: 24px; height: 24px; stroke-width: 2; }
.feature h3 { font-size: 1.15rem; margin-bottom: 8px; }
.feature p { font-size: .95rem; margin: 0; }

/* ============ Platforms ============ */
.platforms {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px;
}
.platform-card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 32px 24px; text-align: center; transition: all .2s ease;
  display: flex; flex-direction: column; align-items: center; gap: 14px;
}
.platform-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: rgba(31,148,164,.35); }
.platform-icon {
  width: 64px; height: 64px; border-radius: 18px;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, #0f2a31, #1a4348);
  color: #fff;
}
.platform-icon svg { width: 34px; height: 34px; fill: currentColor; }
.platform-card h3 { font-size: 1.1rem; margin: 0; }
.platform-card .ver { font-size: .8rem; color: var(--muted); font-family: var(--font-mono); margin: 0; }

/* ============ Server map ============ */
.servers-wrap {
  background: linear-gradient(180deg, rgba(72,180,192,.06), rgba(232,166,89,.06));
  border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 40px;
}
.server-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
}
.server-item {
  display: flex; align-items: center; gap: 12px;
  padding: 14px 16px; background: #fff; border: 1px solid var(--border); border-radius: 12px;
  font-size: .95rem;
}
.server-flag {
  width: 28px; height: 20px; border-radius: 4px; flex-shrink: 0;
  background: linear-gradient(180deg, #48b4c0, #1f94a4);
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-size: .7rem; font-weight: 700;
}
.server-item .ping { margin-left: auto; font-family: var(--font-mono); font-size: .8rem; color: var(--brand); font-weight: 600; }

/* ============ Comparison ============ */
.compare-table {
  width: 100%; border-collapse: collapse; background: #fff;
  border: 1px solid var(--border); border-radius: var(--radius-lg);
  overflow: hidden;
}
.compare-table th, .compare-table td {
  padding: 18px 20px; text-align: left; border-bottom: 1px solid var(--border);
  font-size: .95rem;
}
.compare-table th { background: var(--surface-2); font-weight: 700; }
.compare-table td.center { text-align: center; }
.compare-table tr:last-child td { border-bottom: 0; }
.check { color: #1f94a4; font-weight: 700; }
.cross { color: var(--danger); font-weight: 700; }

/* ============ Steps ============ */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; counter-reset: step; }
.step { position: relative; padding-top: 16px; }
.step::before {
  counter-increment: step; content: counter(step);
  font-family: var(--font-mono); font-weight: 800; font-size: 4rem;
  background: var(--brand-grad); -webkit-background-clip: text; background-clip: text; color: transparent;
  line-height: 1; display: block; margin-bottom: 12px;
}

/* ============ CTA banner ============ */
.cta-banner {
  position: relative; overflow: hidden;
  background: linear-gradient(135deg, #0a2026 0%, #1a4348 100%);
  color: #fff; border-radius: var(--radius-lg);
  padding: 56px 40px; text-align: center;
  box-shadow: var(--shadow-lg);
}
.cta-banner::before {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(600px 200px at 30% 0%, rgba(72,180,192,.45), transparent 70%),
              radial-gradient(500px 200px at 80% 100%, rgba(232,166,89,.32), transparent 70%);
  pointer-events: none;
}
.cta-banner > * { position: relative; }
.cta-banner h2 { color: #fff; }
.cta-banner p { color: #d6e4e6; max-width: 580px; margin: 0 auto 24px; }

/* ============ Footer ============ */
.footer { background: #07181d; color: #c5d4d6; padding: 64px 0 32px; margin-top: 0; }
.footer-grid {
  display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 40px;
  padding-bottom: 40px; border-bottom: 1px solid rgba(255,255,255,.08);
}
.footer h4 { color: #fff; font-size: .85rem; letter-spacing: .1em; text-transform: uppercase; margin-bottom: 14px; }
.footer ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.footer a { color: #c5d4d6; font-size: .9rem; }
.footer a:hover { color: #fff; }
.footer-logo { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.footer-logo img { height: 28px; }
.footer-logo span { font-weight: 800; color: #fff; font-size: 1.05rem; }
.footer-bottom {
  padding-top: 32px; display: flex; flex-wrap: wrap; gap: 16px; justify-content: space-between;
  font-size: .85rem; color: #7a8a8c;
}
.footer-bottom a { color: #7a8a8c; }
.footer-bottom a:hover { color: #fff; }

/* ============ Inner page hero ============ */
.page-head {
  background: radial-gradient(800px 280px at 20% 0%, rgba(72,180,192,.22), transparent 60%),
              radial-gradient(700px 280px at 90% 30%, rgba(232,166,89,.18), transparent 60%),
              linear-gradient(180deg, #0a2026 0%, #163b44 100%);
  color: #fff; padding: 80px 0 80px;
}
.page-head .crumbs { font-size: .85rem; color: #c5d4d6; margin-bottom: 16px; }
.page-head .crumbs a { color: #d6e4e6; }
.page-head h1 { color: #fff; margin-bottom: 12px; }
.page-head p { color: #c5d4d6; max-width: 720px; font-size: 1.1rem; margin: 0; }

/* ============ FAQ ============ */
.faq-list { max-width: 860px; margin: 0 auto; display: grid; gap: 12px; }
.faq-cat-bar { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 32px; justify-content: center; }
.faq-cat {
  padding: 8px 16px; border-radius: 999px; background: #fff;
  border: 1px solid var(--border); font-size: .9rem; font-weight: 500; color: var(--text-2);
  cursor: pointer; transition: all .2s ease;
}
.faq-cat:hover { border-color: var(--brand); color: var(--brand); }
.faq-cat.active { background: var(--brand); border-color: var(--brand); color: #fff; }
details.faq {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 0; transition: border-color .2s ease, box-shadow .2s ease;
}
details.faq[open] { border-color: rgba(31,148,164,.4); box-shadow: var(--shadow-sm); }
details.faq summary {
  list-style: none; cursor: pointer; padding: 22px 56px 22px 24px;
  font-weight: 600; font-size: 1.02rem; position: relative;
  display: flex; gap: 12px; align-items: flex-start;
}
details.faq summary::-webkit-details-marker { display: none; }
details.faq summary::after {
  content: ""; position: absolute; right: 24px; top: 28px;
  width: 16px; height: 16px;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%231f94a4' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'><path d='M6 9l6 6 6-6'/></svg>");
  background-repeat: no-repeat; background-size: contain;
  transition: transform .2s ease;
}
details.faq[open] summary::after { transform: rotate(180deg); }
details.faq .faq-body { padding: 0 24px 22px; color: var(--text-2); }
details.faq .faq-body p:last-child { margin-bottom: 0; }
.faq-q-num {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 24px; height: 24px; border-radius: 8px; background: rgba(31,148,164,.12);
  color: var(--brand); font-size: .75rem; font-weight: 700; font-family: var(--font-mono);
  flex-shrink: 0; padding: 0 6px;
}

/* ============ Article List ============ */
.articles-wrap { display: grid; grid-template-columns: 1fr 280px; gap: 48px; }
.articles-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.article-card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg);
  overflow: hidden; display: flex; flex-direction: column;
  transition: transform .2s ease, box-shadow .2s ease;
}
.article-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.article-cover {
  aspect-ratio: 16/9;
  background:
    repeating-linear-gradient(135deg, rgba(255,255,255,.06) 0 12px, transparent 12px 24px),
    linear-gradient(135deg, #48b4c0 0%, #1f94a4 60%, #146876 100%);
  position: relative; display: flex; align-items: flex-end; padding: 16px;
}
.article-cover .tag {
  background: rgba(255,255,255,.95); color: var(--brand); padding: 4px 10px;
  border-radius: 6px; font-size: .75rem; font-weight: 700;
}
.article-cover.v2 { background: linear-gradient(135deg, #1f94a4 0%, #e8a659 100%), repeating-linear-gradient(135deg, rgba(0,0,0,.04) 0 12px, transparent 12px 24px); }
.article-cover.v3 { background: linear-gradient(135deg, #e8a659 0%, #d96552 100%); }
.article-cover.v4 { background: linear-gradient(135deg, #6c543c 0%, #e8a659 100%); }
.article-cover.v5 { background: linear-gradient(135deg, #0a2026 0%, #48b4c0 100%); }
.article-cover.v6 { background: linear-gradient(135deg, #48b4c0 0%, #6c543c 100%); }
.article-body { padding: 22px 22px 24px; flex: 1; display: flex; flex-direction: column; }
.article-body h3 {
  font-size: 1.15rem; margin-bottom: 8px; color: var(--text);
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.article-body h3 a { color: inherit; }
.article-body h3 a:hover { color: var(--brand); }
.article-body p {
  font-size: .92rem; color: var(--text-2); margin-bottom: 16px; flex: 1;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.article-meta { font-size: .82rem; color: var(--muted); display: flex; gap: 14px; align-items: center; }
.article-meta time { font-family: var(--font-mono); }

aside.sidebar { display: flex; flex-direction: column; gap: 24px; }
.side-box {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px;
}
.side-box h4 { font-size: 1rem; margin: 0 0 14px; font-weight: 700; }
.side-search {
  display: flex; gap: 0; border: 1px solid var(--border); border-radius: 10px; overflow: hidden;
}
.side-search input {
  flex: 1; border: 0; padding: 12px 14px; font: inherit; font-size: .9rem;
  background: transparent; outline: none;
}
.side-search button {
  border: 0; background: var(--brand); color: #fff; padding: 0 16px; font-weight: 600;
}
.tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
.tag-cloud a {
  padding: 5px 11px; border-radius: 999px; background: var(--surface-2);
  color: var(--text-2); font-size: .82rem;
}
.tag-cloud a:hover { background: var(--brand); color: #fff; }
.side-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 14px; }
.side-list a { color: var(--text); font-size: .92rem; font-weight: 500; display: block; line-height: 1.5; }
.side-list a:hover { color: var(--brand); }
.side-list time { font-family: var(--font-mono); font-size: .76rem; color: var(--muted); display: block; margin-top: 4px; }

/* ============ Article Detail ============ */
.post-wrap { display: grid; grid-template-columns: minmax(0, 1fr) 280px; gap: 56px; max-width: 1100px; margin: 0 auto; }
.post-content { font-size: 1.05rem; line-height: 1.85; color: var(--text); }
.post-content h2 { margin-top: 2em; margin-bottom: .8em; font-size: 1.7rem; }
.post-content h3 { margin-top: 1.6em; font-size: 1.25rem; }
.post-content p { color: var(--text); margin: 0 0 1.2em; }
.post-content ul, .post-content ol { padding-left: 1.3em; margin: 0 0 1.2em; }
.post-content li { margin-bottom: .5em; color: var(--text); }
.post-content blockquote {
  margin: 1.4em 0; padding: 18px 24px; border-left: 4px solid var(--brand);
  background: var(--surface-2); border-radius: 0 10px 10px 0; color: var(--text-2);
}
.post-content blockquote p:last-child { margin-bottom: 0; }
.post-content code {
  font-family: var(--font-mono); background: var(--surface-2); padding: 2px 7px;
  border-radius: 5px; font-size: .9em;
}
.post-content img { border-radius: 12px; margin: 1.4em 0; }
.post-content a { text-decoration: underline; text-decoration-thickness: 1.5px; text-underline-offset: 3px; }
.post-cover {
  aspect-ratio: 21/9; border-radius: var(--radius-lg); margin: 28px 0 32px;
  background:
    repeating-linear-gradient(135deg, rgba(255,255,255,.08) 0 16px, transparent 16px 32px),
    linear-gradient(135deg, #48b4c0 0%, #1f94a4 45%, #e8a659 100%);
  display: flex; align-items: flex-end; padding: 32px; color: #fff;
}
.post-cover .tag {
  background: rgba(255,255,255,.2); border: 1px solid rgba(255,255,255,.3);
  backdrop-filter: blur(8px); color: #fff; padding: 6px 14px;
  border-radius: 8px; font-size: .8rem; font-weight: 600;
}
.post-meta {
  display: flex; flex-wrap: wrap; gap: 20px; align-items: center;
  padding-bottom: 24px; border-bottom: 1px solid var(--border); margin-bottom: 32px;
  color: var(--muted); font-size: .9rem;
}
.post-meta .author { display: flex; align-items: center; gap: 10px; color: var(--text); font-weight: 600; }
.post-meta .avatar {
  width: 36px; height: 36px; border-radius: 50%;
  background: var(--brand-grad); display: flex; align-items: center; justify-content: center;
  color: #fff; font-weight: 700; font-size: .85rem;
}
.toc { position: sticky; top: 88px; }
.toc h4 { font-size: .8rem; letter-spacing: .12em; text-transform: uppercase; color: var(--muted); margin: 0 0 16px; font-weight: 700; }
.toc ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; border-left: 2px solid var(--border); padding-left: 18px; }
.toc a { display: block; color: var(--text-2); font-size: .9rem; line-height: 1.45; }
.toc a:hover { color: var(--brand); }

/* ============ Privacy ============ */
.legal-wrap { max-width: 820px; margin: 0 auto; }
.legal-toc {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px 28px; margin-bottom: 40px;
}
.legal-toc h4 { font-size: .85rem; letter-spacing: .1em; text-transform: uppercase; color: var(--muted); margin: 0 0 12px; font-weight: 700; }
.legal-toc ol { padding-left: 20px; margin: 0; display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px 24px; }
.legal-toc a { color: var(--text); font-size: .95rem; }
.legal-section { margin-bottom: 48px; scroll-margin-top: 80px; }
.legal-section h2 {
  font-size: 1.4rem; padding-bottom: 12px; border-bottom: 1px solid var(--border);
  display: flex; align-items: center; gap: 12px;
}
.legal-section h2 .num {
  font-family: var(--font-mono); font-size: 1rem; padding: 4px 10px; border-radius: 6px;
  background: rgba(31,148,164,.12); color: var(--brand);
}
.callout {
  display: flex; gap: 14px; padding: 18px 20px;
  background: var(--surface-2); border-left: 3px solid var(--brand-2);
  border-radius: 0 10px 10px 0; margin: 20px 0;
}
.callout-icon {
  flex-shrink: 0; width: 36px; height: 36px; border-radius: 10px;
  background: rgba(232,166,89,.18); color: #b97a35;
  display: flex; align-items: center; justify-content: center;
}
.callout-icon svg { width: 20px; height: 20px; }
.callout p { margin: 0; color: var(--text); font-size: .95rem; }
.callout strong { display: block; color: var(--text); margin-bottom: 4px; }

/* ============ Download page ============ */
.dl-hero-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px;
  max-width: 880px; margin: 32px auto 0;
}
.dl-mini {
  background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.12);
  border-radius: 14px; padding: 16px; text-align: center; color: #fff;
  text-decoration: none; transition: background .2s ease, transform .2s ease;
}
.dl-mini:hover { background: rgba(255,255,255,.12); color: #fff; transform: translateY(-2px); }
.dl-mini svg { width: 28px; height: 28px; fill: currentColor; margin-bottom: 8px; }
.dl-mini-name { display: block; font-weight: 600; font-size: .9rem; }
.dl-mini-size { display: block; font-size: .75rem; color: #c5d4d6; font-family: var(--font-mono); margin-top: 2px; }

.dl-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px;
  margin-top: 8px;
}
.dl-card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 28px; scroll-margin-top: 80px;
  display: flex; flex-direction: column; gap: 16px;
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}
.dl-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: rgba(31,148,164,.3); }
.dl-card-head { display: flex; align-items: center; gap: 16px; }
.dl-icon-lg {
  width: 56px; height: 56px; border-radius: 16px;
  background: linear-gradient(145deg, #0f2a31, #1a4348); color: #fff;
  display: flex; align-items: center; justify-content: center; margin-bottom: 0;
  flex-shrink: 0;
}
.dl-icon-lg svg { width: 30px; height: 30px; fill: currentColor; }
.dl-card h2 { font-size: 1.25rem; margin: 0 0 4px; }
.dl-card .dl-tag { font-size: .78rem; color: var(--muted); font-family: var(--font-mono); }
.dl-card p.dl-desc { font-size: .9rem; color: var(--text-2); margin: 0; line-height: 1.55; }
.dl-spec {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px 20px; margin: 0;
  padding: 14px 16px; background: var(--surface-2); border-radius: 12px;
  font-size: .82rem;
}
.dl-spec dt { color: var(--muted); font-weight: 500; }
.dl-spec dd { margin: 0; color: var(--text); font-weight: 600; font-family: var(--font-mono); }
.dl-buttons { display: flex; flex-wrap: wrap; gap: 10px; margin-top: auto; }
.dl-buttons .btn { padding: 10px 16px; font-size: .88rem; }

/* legacy dl-visual no longer used */
.dl-visual {
  aspect-ratio: 4/3; border-radius: 16px;
  background:
    repeating-linear-gradient(135deg, rgba(255,255,255,.05) 0 14px, transparent 14px 28px),
    linear-gradient(135deg, #0a2026, #1f94a4, #48b4c0);
  display: flex; align-items: center; justify-content: center; color: #fff;
  font-family: var(--font-mono); font-size: .85rem; letter-spacing: .05em;
  position: relative; overflow: hidden;
}
.dl-visual.android { background: linear-gradient(135deg, #1a4348, #48b4c0, #a8d8b9); }
.dl-visual.ios { background: linear-gradient(135deg, #0f2a31, #6c543c, #e8a659); }
.dl-visual.win { background: linear-gradient(135deg, #146876, #1f94a4, #48b4c0); }
.dl-visual.mac { background: linear-gradient(135deg, #1a4348, #6c543c, #e8a659); }
.dl-visual-inner {
  background: rgba(0,0,0,.35); padding: 10px 18px; border-radius: 999px;
  border: 1px solid rgba(255,255,255,.25); backdrop-filter: blur(6px);
}

/* ============ Helpers ============ */
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2.5rem; }

/* ============ Responsive ============ */
@media (max-width: 960px) {
  .nav-links { display: none; }
  .nav-burger { display: inline-flex; }
  .nav-cta .btn-ghost { display: none; }
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero { padding: 64px 0 80px; }
  .device { max-width: 280px; }
  .hero-viz { max-width: 340px; }
  .hero-chip { padding: 10px 12px; min-width: 110px; }
  .hero-chip .chip-value { font-size: 1rem; }
  .hero-chip .chip-value-lg { font-size: 1.3rem; }
  .chip-tl { left: -2%; }
  .chip-tr { right: -2%; }
  .chip-bl { left: -2%; }
  .chip-br { right: -2%; }
  .features { grid-template-columns: 1fr; }
  .platforms { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: 1fr; gap: 24px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .articles-wrap { grid-template-columns: 1fr; gap: 40px; }
  .articles-grid { grid-template-columns: 1fr; }
  .post-wrap { grid-template-columns: 1fr; gap: 24px; }
  .toc { position: static; }
  .section { padding: 64px 0; }
  .dl-grid { grid-template-columns: 1fr; gap: 16px; }
  .dl-card { padding: 22px; }
  .dl-hero-grid { grid-template-columns: repeat(2, 1fr); }
  .legal-toc ol { grid-template-columns: 1fr; }
  .compare-table { font-size: .85rem; }
  .compare-table th, .compare-table td { padding: 12px 10px; }
  .cta-banner { padding: 40px 24px; }
  .hero-stats { gap: 24px; }

  /* Mobile menu drawer */
  .nav-links.open {
    display: flex; position: fixed; top: 68px; left: 0; right: 0;
    flex-direction: column; padding: 24px; gap: 0;
    background: #fff; border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
  }
  .nav-links.open a { padding: 14px 0; border-bottom: 1px solid var(--border); width: 100%; }
  .nav-links.open a:last-child { border-bottom: 0; }
}
@media (max-width: 540px) {
  .platforms { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .compare-table { font-size: .8rem; }
  .nav-cta .btn { padding: 10px 14px; font-size: .85rem; }
  .servers-wrap { padding: 24px; }
}