:root {
  --t5-blue: #2AABEE;
  --t5-blue-dark: #1e96d4;
  --t5-ink: #1f2937;
  --t5-text: #4b5563;
  --t5-muted: #6b7280;
  --t5-line: #eef2f6;
  --t5-soft: #f7fafc;
  --t5-max: 1100px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: #fff;
  color: var(--t5-text);
  line-height: 1.7;
}
a { color: var(--t5-blue); text-decoration: none; }
a:hover { color: var(--t5-blue-dark); }
img { max-width: 100%; height: auto; display: block; }
.t5-skip { position: absolute; left: -9999px; }
.t5-skip:focus { left: 12px; top: 12px; z-index: 99; padding: 8px 12px; background: var(--t5-blue); color: #fff; }
.t5-visually-hidden {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
.t5-container { width: 100%; max-width: var(--t5-max); margin: 0 auto; padding: 0 24px; }
.t5-container--narrow { max-width: 760px; }
.t5-container--faq { max-width: 820px; }

.t5-logo {
  width: 32px; height: 32px; border-radius: 50%;
  background: var(--t5-blue) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath fill='%23fff' d='M21.5 3.4 2.9 10.7c-.8.3-.8 1.1-.1 1.4l4.7 1.5 1.8 5.6c.2.7 1 .9 1.5.4l2.6-2.5 4.8 3.5c.7.5 1.6.1 1.8-.7L23 4.6c.2-.9-.7-1.6-1.5-1.2zM9.4 13.2l8.6-6.7-6.7 7.9-.2 2.6-1.7-3.8z'/%3E%3C/svg%3E") center 52%/58% no-repeat;
  display: inline-block; flex-shrink: 0;
}

.t5-header {
  position: sticky; top: 0; z-index: 40;
  background: #fff; border-bottom: 1px solid var(--t5-line);
}
.t5-header__inner { display: flex; align-items: center; gap: 16px; min-height: 64px; position: relative; }
.t5-brand { display: flex; align-items: center; gap: 8px; color: var(--t5-ink); font-weight: 800; }
.t5-brand:hover { color: var(--t5-ink); }
.t5-nav { display: flex; gap: 2px; margin-left: auto; }
.t5-nav a { color: var(--t5-ink); font-size: 14px; font-weight: 600; padding: 8px 12px; border-radius: 8px; }
.t5-nav a:hover { color: var(--t5-blue); }
.t5-cta {
  margin-left: 8px; padding: 8px 16px; border-radius: 8px;
  background: var(--t5-blue); color: #fff !important; font-size: 14px; font-weight: 700;
}
.t5-cta:hover { background: var(--t5-blue-dark); }
.t5-nav-toggle {
  display: none; margin-left: auto; flex-direction: column; gap: 5px;
  border: 0; background: none; padding: 8px; cursor: pointer;
}
.t5-nav-toggle span { width: 20px; height: 2px; background: var(--t5-blue); display: block; }

.t5-btn {
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 10px; background: var(--t5-blue); color: #fff !important;
  font-weight: 700; border: 1px solid var(--t5-blue);
}
.t5-btn:hover { background: var(--t5-blue-dark); }
.t5-btn--sm { padding: 10px 18px; font-size: 14px; }
.t5-btn--lg { padding: 14px 28px; font-size: 16px; box-shadow: 0 10px 22px rgba(42,171,238,.28); }

.t5-hero { padding: 48px 0 40px; text-align: center; }
.t5-hero h1 {
  margin: 0 0 10px; font-size: clamp(28px, 5vw, 42px);
  color: var(--t5-blue); line-height: 1.25;
}
.t5-hero__sub { margin: 0 0 28px; color: var(--t5-muted); }
.t5-hero__hint { margin: 16px 0 0; font-size: 13px; color: var(--t5-muted); }
.t5-hero__actions {
  display: flex; justify-content: center; align-items: center;
  gap: 12px; flex-wrap: wrap; margin-top: 8px;
}

.t5-devices {
  display: grid; grid-template-columns: 110px 1fr 110px;
  gap: 12px; align-items: end; max-width: 640px; margin: 0 auto 28px;
}
.t5-laptop__screen {
  height: 210px; background: #1c2836; border-radius: 12px 12px 0 0; padding: 10px;
  display: grid; grid-template-columns: 70px 1fr; overflow: hidden;
}
.t5-laptop__screen aside { background: #243447; border-radius: 8px 0 0 0; }
.t5-laptop__screen header { height: 28px; background: var(--t5-blue); border-radius: 0 8px 0 0; }
.t5-laptop__screen b { display: block; height: 10px; margin: 10px 12px; background: #334155; border-radius: 6px; }
.t5-laptop__base { height: 12px; background: #c5ccd6; border-radius: 0 0 16px 16px; }
.t5-phone {
  height: 170px; background: #111827; border-radius: 16px; padding: 10px 8px;
  box-shadow: 0 12px 24px rgba(15,23,42,.12);
}
.t5-phone__bar { height: 8px; width: 36px; margin: 0 auto 10px; background: #374151; border-radius: 8px; }
.t5-phone p { height: 8px; margin: 0 0 8px; background: #2aabee; border-radius: 6px; opacity: .7; }
.t5-phone p:nth-child(3) { width: 70%; background: #334155; }
.t5-phone--l { transform: rotate(-8deg); }
.t5-phone--r { transform: rotate(8deg); }

.t5-section { padding: 52px 0; }
.t5-section--soft { background: var(--t5-soft); }
.t5-head { text-align: center; margin-bottom: 28px; }
.t5-head h2, h2.t5-head { margin: 0; font-size: clamp(24px, 3vw, 32px); color: var(--t5-ink); }
.t5-head--line h2 { display: inline-block; padding-bottom: 8px; border-bottom: 3px solid var(--t5-blue); }
.t5-more { text-align: center; margin: 24px 0 0; }

.t5-duck {
  width: 68px; height: 68px; display: block; margin: 0 auto 10px;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 72 72'%3E%3Cellipse cx='32' cy='42' rx='20' ry='16' fill='%23FFD54A'/%3E%3Ccircle cx='44' cy='26' r='12' fill='%23FFD54A'/%3E%3Cellipse cx='56' cy='27' rx='8' ry='4' fill='%23FF8A3D'/%3E%3Ccircle cx='48' cy='24' r='2.2' fill='%23222'/%3E%3C/svg%3E") center / contain no-repeat;
}
.t5-duck--2 { transform: scaleX(-1); }
.t5-duck--3 { filter: hue-rotate(10deg); }
.t5-duck--4 { transform: rotate(-10deg); }
.t5-duck--5 { filter: saturate(1.2); }
.t5-duck--6 { transform: scaleX(-1) rotate(6deg); }
.t5-duck--7 { filter: hue-rotate(-12deg); }
.t5-duck--8 { transform: rotate(8deg); }
.t5-duck--9 { transform: scaleX(-1) rotate(-6deg); }

.t5-feat { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px 16px; }
.t5-feat--3 { margin-top: 36px; }
.t5-feat article { text-align: center; padding: 8px 12px; }
.t5-feat h2, .t5-feat h3 { margin: 0 0 6px; font-size: 18px; color: var(--t5-ink); }
.t5-feat p { margin: 0 0 12px; font-size: 14px; color: var(--t5-muted); }

.t5-thumb {
  display: block; aspect-ratio: 16 / 9; border-radius: 12px; overflow: hidden;
  background:
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath fill='%23fff' d='M21.5 3.4 2.9 10.7c-.8.3-.8 1.1-.1 1.4l4.7 1.5 1.8 5.6c.2.7 1 .9 1.5.4l2.6-2.5 4.8 3.5c.7.5 1.6.1 1.8-.7L23 4.6c.2-.9-.7-1.6-1.5-1.2z'/%3E%3C/svg%3E") center / 36px no-repeat,
    linear-gradient(160deg, #1d4f73, #0f2740);
  position: relative;
}
.t5-thumb img { width: 100%; height: 100%; object-fit: cover; }
.t5-thumb--wide { margin-bottom: 18px; }
.t5-blog { display: grid; grid-template-columns: 1fr 1fr; gap: 28px 32px; }
.t5-blog--4 { grid-template-columns: repeat(4, 1fr); }
.t5-blog article time { display: block; margin: 10px 0 6px; font-size: 13px; color: var(--t5-muted); }
.t5-blog h2, .t5-blog h3 { margin: 0 0 8px; font-size: 18px; }
.t5-blog h2 a, .t5-blog h3 a { color: var(--t5-blue); }
.t5-blog p {
  margin: 0; font-size: 14px; color: var(--t5-muted);
  display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden;
}

.t5-qa article {
  padding: 16px 0; border-bottom: 1px solid var(--t5-line);
}
.t5-qa article:last-child { border-bottom: 0; }
.t5-qa__q, .t5-qa__a { margin: 0 0 8px; }
.t5-qa__q { color: var(--t5-ink); font-weight: 700; }
.t5-qa__a { color: var(--t5-muted); }
.t5-qa span { color: var(--t5-blue); font-weight: 800; }

.t5-links { display: flex; flex-wrap: wrap; gap: 10px 16px; justify-content: center; }
.t5-links a { color: var(--t5-muted); }

.t5-pagehead { padding: 40px 0 8px; text-align: center; }
.t5-pagehead h1 { margin: 0; font-size: clamp(24px, 4vw, 34px); color: var(--t5-ink); }
.t5-pagehead p { margin: 8px 0 0; color: var(--t5-muted); }
.t5-crumb { font-size: 13px; color: var(--t5-muted); margin-bottom: 20px; }
.t5-crumb a { color: var(--t5-muted); }
.t5-crumb span { margin: 0 8px; }

.t5-post { padding: 28px 0 8px; }
.t5-post__cover { border-radius: 14px; overflow: hidden; margin-bottom: 18px; aspect-ratio: 16 / 8; background: #0f2740; }
.t5-post__cover img { width: 100%; height: 100%; object-fit: cover; }
.t5-post header > time { display: block; font-size: 13px; color: var(--t5-muted); margin-bottom: 8px; }
.t5-post h1 { margin: 0 0 10px; font-size: clamp(24px, 4vw, 34px); color: var(--t5-blue); line-height: 1.35; }
.t5-post__meta { font-size: 13px; color: var(--t5-muted); margin-bottom: 16px; }
.t5-post__lead {
  margin: 0 0 24px; padding: 0 0 0 14px;
  border-left: 3px solid #93d4f7; color: #475569; font-size: 15px;
}
.t5-post__body { font-size: 16px; line-height: 1.95; color: #243044; }
.t5-post__body h2, .t5-post__body h3 { margin: 1.5em 0 .6em; color: var(--t5-ink); }
.t5-post__body p { margin: 0 0 1em; }
.t5-post__body img { border-radius: 10px; margin: 14px 0; }
.t5-post__source { margin-top: 20px; font-size: 13px; color: var(--t5-muted); word-break: break-all; }
.t5-pn { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 22px; }
.t5-pn a { display: block; padding: 14px 16px; background: var(--t5-soft); border-radius: 12px; color: inherit; }
.t5-pn em { display: block; font-style: normal; font-size: 12px; color: var(--t5-blue); }

.t5-pages { margin-top: 24px; text-align: center; }
.t5-pages a, .t5-pages span {
  display: inline-block; padding: 6px 12px; margin: 0 3px;
  border: 1px solid var(--t5-line); border-radius: 8px; font-size: 14px; color: var(--t5-text);
}
.t5-empty { text-align: center; padding: 64px 16px; color: var(--t5-muted); }
.t5-empty h1 { margin: 0 0 10px; color: var(--t5-ink); }

.t5-footer { border-top: 4px solid #d7eefb; padding-top: 36px; }
.t5-footer__grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr auto; gap: 24px; margin-bottom: 28px; }
.t5-footer__brand { display: flex; align-items: center; gap: 8px; margin-bottom: 10px; color: var(--t5-ink); }
.t5-footer__title { margin: 0 0 12px; font-size: 15px; color: var(--t5-ink); }
.t5-footer a { display: block; color: var(--t5-muted); margin-bottom: 8px; font-size: 14px; }
.t5-footer a:hover { color: var(--t5-blue); }
.t5-qr { text-align: center; }
.t5-qr a { color: var(--t5-muted); }
.t5-qr__box {
  width: 92px; height: 92px; display: block; margin: 0 auto 8px; border-radius: 8px;
  background:
    repeating-linear-gradient(90deg, var(--t5-blue) 0 6px, #fff 6px 10px),
    repeating-linear-gradient(0deg, var(--t5-blue) 0 6px, #fff 6px 10px);
  background-blend-mode: multiply;
}
.t5-qr em { font-style: normal; font-size: 12px; }
.t5-footer__bottom { text-align: center; padding: 16px 24px; border-top: 1px solid var(--t5-line); font-size: 13px; color: var(--t5-muted); }
.t5-footer__bottom p { margin: 0 0 4px; }

@media (max-width: 1020px) {
  .t5-feat, .t5-blog--4 { grid-template-columns: 1fr 1fr; }
  .t5-footer__grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .t5-nav-toggle { display: flex; }
  .t5-cta { display: none; }
  .t5-nav {
    display: none; position: absolute; left: 0; right: 0; top: 64px;
    flex-direction: column; background: #fff; padding: 8px 16px 16px;
    border-bottom: 1px solid var(--t5-line);
  }
  .t5-nav.is-open { display: flex; }
  .t5-devices { grid-template-columns: 1fr; max-width: 360px; }
  .t5-phone { display: none; }
  .t5-feat, .t5-blog, .t5-blog--4, .t5-pn, .t5-footer__grid { grid-template-columns: 1fr; }
  .t5-hero__actions { flex-direction: column; }
  .t5-btn { width: 100%; }
}