/* ==========================================================
   爱思助手 i4Tools · 站点样式
   ========================================================== */
:root {
  --brand: #1668ff;
  --brand-2: #00b8ff;
  --brand-dark: #0a48c2;
  --ink: #0d1220;
  --ink-2: #4a5468;
  --ink-3: #818b9f;
  --bg: #ffffff;
  --bg-soft: #f4f7ff;
  --bg-soft-2: #eaf1ff;
  --line: rgba(13, 18, 32, .1);
  --line-2: rgba(13, 18, 32, .16);
  --grad: linear-gradient(135deg, var(--brand), var(--brand-2));
  --grad-soft: linear-gradient(135deg, rgba(22, 104, 255, .12), rgba(0, 184, 255, .1));
  --radius: 16px;
  --radius-lg: 24px;
  --shadow: 0 18px 44px rgba(13, 30, 80, .1);
  --shadow-brand: 0 16px 34px rgba(22, 104, 255, .28);
  --nav-h: 72px;
  --wrap: 1200px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: var(--nav-h); }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font-family: inherit; }

.wrap { width: 100%; max-width: var(--wrap); margin-inline: auto; padding-inline: 20px; }

/* ---------------- 按钮 ---------------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  padding: 12px 24px; border-radius: 999px;
  font-size: 15px; font-weight: 700; border: 1px solid transparent;
  cursor: pointer; transition: .25s; white-space: nowrap;
}
.btn svg { width: 19px; height: 19px; stroke-width: 1.8; fill: none; stroke: currentColor; stroke-linecap: round; stroke-linejoin: round; }
.btn--primary { background: var(--grad); color: #fff; box-shadow: var(--shadow-brand); }
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 20px 40px rgba(22, 104, 255, .36); }
.btn--ghost { background: #fff; color: var(--brand); border-color: var(--line-2); }
.btn--ghost:hover { border-color: var(--brand); color: var(--brand-dark); transform: translateY(-2px); }
.btn--dark { background: var(--ink); color: #fff; }
.btn--dark:hover { transform: translateY(-2px); }
.btn--lg { padding: 15px 34px; font-size: 16.5px; }
.btn--sm { padding: 9px 18px; font-size: 14px; }

/* ---------------- 导航 ---------------- */
.nav {
  position: sticky; top: 0; z-index: 60; height: var(--nav-h);
  background: rgba(255, 255, 255, .86);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
  transition: .3s;
}
.nav.is-stuck { box-shadow: 0 6px 24px rgba(13, 30, 80, .08); }
.nav__inner { height: var(--nav-h); display: flex; align-items: center; gap: 26px; }
.logo { display: flex; align-items: center; gap: 11px; flex-shrink: 0; }
.logo img { width: 38px; height: 38px; border-radius: 10px; }
.logo__text { display: flex; flex-direction: column; line-height: 1.15; }
.logo__text b { font-size: 17.5px; font-weight: 800; letter-spacing: .3px; }
.logo__text i { font-style: normal; font-size: 11.5px; color: var(--ink-3); letter-spacing: 1.4px; }
.nav__menu { display: flex; align-items: center; gap: 4px; margin-left: 12px; }
.nav__link {
  padding: 9px 15px; border-radius: 10px; font-size: 15px; font-weight: 600;
  color: var(--ink-2); transition: .22s;
}
.nav__link:hover, .nav__link.is-active { color: var(--brand); background: var(--bg-soft); }
.nav__actions { margin-left: auto; display: flex; align-items: center; gap: 10px; }
.lang { display: flex; gap: 2px; padding: 3px; border-radius: 999px; background: var(--bg-soft); }
.lang__btn {
  padding: 5px 13px; border-radius: 999px; font-size: 13px; font-weight: 700;
  color: var(--ink-3); transition: .22s;
}
.lang__btn:hover { color: var(--brand); }
.lang__btn.is-active { background: #fff; color: var(--brand); box-shadow: 0 2px 8px rgba(13, 30, 80, .1); }
.burger {
  display: none; width: 40px; height: 40px; border-radius: 11px; cursor: pointer;
  background: var(--bg-soft); border: 0; position: relative;
}
.burger span {
  position: absolute; left: 11px; width: 18px; height: 2px; border-radius: 2px;
  background: var(--ink); transition: .25s;
}
.burger span:nth-child(1) { top: 14px; }
.burger span:nth-child(2) { top: 19px; }
.burger span:nth-child(3) { top: 24px; }
.burger.is-open span:nth-child(1) { top: 19px; transform: rotate(45deg); }
.burger.is-open span:nth-child(2) { opacity: 0; }
.burger.is-open span:nth-child(3) { top: 19px; transform: rotate(-45deg); }

/* ---------------- Hero ---------------- */
.hero { position: relative; padding: 66px 0 84px; overflow: hidden; }
.hero::before {
  content: ""; position: absolute; inset: 0; z-index: 0;
  background:
    radial-gradient(760px 420px at 12% -8%, rgba(22, 104, 255, .16), transparent 68%),
    radial-gradient(700px 420px at 92% 6%, rgba(0, 184, 255, .16), transparent 68%);
}
.hero::after {
  content: ""; position: absolute; inset: 0; z-index: 0; opacity: .5;
  background-image:
    linear-gradient(rgba(13, 30, 80, .045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(13, 30, 80, .045) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: radial-gradient(900px 520px at 50% 0%, #000, transparent 78%);
}
.hero__inner { position: relative; z-index: 1; display: grid; grid-template-columns: 1.02fr 1fr; gap: 46px; align-items: center; }
.hero__badge {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 7px 15px 7px 8px; border-radius: 999px;
  background: #fff; border: 1px solid var(--line);
  font-size: 13.5px; color: var(--ink-2); box-shadow: 0 6px 18px rgba(13, 30, 80, .07);
}
.hero__badge b { color: var(--brand); font-weight: 800; }
.hero__dot {
  padding: 3px 10px; border-radius: 999px; background: var(--grad);
  color: #fff; font-size: 12px; font-weight: 800;
}
.hero__title { margin: 22px 0 18px; font-size: clamp(32px, 4.4vw, 52px); font-weight: 900; line-height: 1.18; letter-spacing: -.5px; }
.hero__title em {
  font-style: normal; display: inline-block;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero__desc { font-size: 17px; color: var(--ink-2); max-width: 560px; }
.hero__cta { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 30px; }
.hero__meta { display: flex; flex-wrap: wrap; gap: 10px 26px; margin-top: 22px; font-size: 13.5px; color: var(--ink-3); }
.hero__meta span { display: inline-flex; align-items: center; gap: 7px; }
.hero__meta svg { width: 15px; height: 15px; stroke: var(--brand); fill: none; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }

/* Hero 手机视觉 */
.hero__visual { position: relative; display: grid; place-items: center; min-height: 430px; }
.phone {
  position: relative; width: 268px; height: 452px; border-radius: 42px;
  background: linear-gradient(160deg, #12203f, #0b1330);
  border: 3px solid #26314f;
  box-shadow: 0 32px 70px rgba(10, 30, 80, .3), inset 0 0 0 1px rgba(255, 255, 255, .06);
  padding: 16px 14px; overflow: hidden;
}
.phone::before {
  content: ""; position: absolute; top: 10px; left: 50%; transform: translateX(-50%);
  width: 96px; height: 26px; border-radius: 999px; background: #0a1128;
}
.phone__screen {
  height: 100%; border-radius: 30px; padding: 40px 14px 14px;
  background: linear-gradient(180deg, #f2f6ff, #dfe9ff);
  display: flex; flex-direction: column; gap: 10px;
}
.phone__row {
  display: flex; align-items: center; gap: 10px;
  padding: 11px 13px; border-radius: 14px; background: #fff;
  box-shadow: 0 5px 14px rgba(13, 30, 80, .08);
  animation: rise 5s ease-in-out infinite;
}
.phone__row:nth-child(2) { animation-delay: .5s; }
.phone__row:nth-child(3) { animation-delay: 1s; }
.phone__row:nth-child(4) { animation-delay: 1.5s; }
.phone__ico {
  width: 30px; height: 30px; border-radius: 9px; flex-shrink: 0;
  display: grid; place-items: center; background: var(--grad); color: #fff; font-size: 15px;
}
.phone__row b { display: block; font-size: 12.5px; line-height: 1.3; }
.phone__row span { font-size: 11px; color: #7d8798; }
.phone__bar { margin-top: auto; height: 8px; border-radius: 999px; background: rgba(13, 30, 80, .1); overflow: hidden; }
.phone__bar i { display: block; height: 100%; width: 92%; border-radius: 999px; background: var(--grad); }
@keyframes rise {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}
.chip {
  position: absolute; display: flex; align-items: center; gap: 9px;
  padding: 11px 16px; border-radius: 15px; background: #fff;
  border: 1px solid var(--line); box-shadow: var(--shadow);
  font-size: 13px; font-weight: 700; animation: float 5s ease-in-out infinite;
}
.chip i { font-style: normal; font-size: 17px; }
.chip small { display: block; font-size: 11px; font-weight: 500; color: var(--ink-3); }
.chip--1 { top: 30px; left: -6px; }
.chip--2 { bottom: 74px; right: -18px; animation-delay: 1.2s; }
.chip--3 { bottom: 12px; left: 6px; animation-delay: 2.4s; }
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* ---------------- 统计 ---------------- */
.stats {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px;
  padding: 30px 10px; border-radius: var(--radius-lg);
  background: var(--grad-soft); border: 1px solid var(--line);
}
.stat { text-align: center; }
.stat b { display: block; font-size: clamp(26px, 3vw, 38px); font-weight: 900; color: var(--brand); line-height: 1.1; }
.stat span { font-size: 14px; color: var(--ink-2); }

/* ---------------- 通用区块 ---------------- */
.block { padding: 82px 0; }
.block--soft { background: var(--bg-soft); }
.block__head { max-width: 720px; margin: 0 auto 44px; text-align: center; }
.block__head .eyebrow {
  display: inline-block; margin-bottom: 12px;
  font-size: 13px; font-weight: 800; letter-spacing: 2px; text-transform: uppercase; color: var(--brand);
}
.block__head h2 { font-size: clamp(26px, 3.2vw, 38px); font-weight: 900; letter-spacing: -.3px; margin-bottom: 12px; }
.block__head p { color: var(--ink-2); font-size: 16.5px; }
.block__head--left { margin-inline: 0; text-align: left; }

/* ---------------- 功能卡片 ---------------- */
.features { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.feat {
  position: relative; padding: 28px 26px 30px; border-radius: var(--radius-lg);
  background: #fff; border: 1px solid var(--line); overflow: hidden; transition: .3s;
}
.feat::before {
  content: ""; position: absolute; inset: 0; opacity: 0; transition: .3s;
  background: radial-gradient(320px 180px at var(--mx, 50%) var(--my, 0%), rgba(22, 104, 255, .12), transparent 70%);
}
.feat:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: rgba(22, 104, 255, .3); }
.feat:hover::before { opacity: 1; }
.feat__ico {
  position: relative; width: 52px; height: 52px; border-radius: 15px;
  display: grid; place-items: center; margin-bottom: 18px;
  background: var(--grad-soft); color: var(--brand); font-size: 24px;
}
.feat h3 { position: relative; font-size: 18.5px; font-weight: 800; margin-bottom: 9px; }
.feat p { position: relative; font-size: 14.8px; color: var(--ink-2); }
.feat__tag {
  position: relative; display: inline-block; margin-top: 16px;
  font-size: 12.5px; font-weight: 700; color: var(--brand);
}

/* ---------------- 工具箱 / 流程 ---------------- */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; counter-reset: s; }
.step {
  position: relative; padding: 30px 28px; border-radius: var(--radius-lg);
  background: #fff; border: 1px solid var(--line); box-shadow: 0 10px 30px rgba(13, 30, 80, .05);
}
.step::before {
  counter-increment: s; content: counter(s);
  position: absolute; right: 24px; top: 18px;
  font-size: 44px; font-weight: 900; color: rgba(22, 104, 255, .12); line-height: 1;
}
.step h3 { font-size: 18px; margin-bottom: 10px; }
.step p { font-size: 14.8px; color: var(--ink-2); }

.tools { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.tool {
  display: flex; align-items: center; gap: 12px;
  padding: 16px 18px; border-radius: var(--radius);
  background: #fff; border: 1px solid var(--line); font-size: 15px; font-weight: 600;
  transition: .25s;
}
.tool:hover { border-color: var(--brand); color: var(--brand); transform: translateY(-3px); }
.tool i { font-style: normal; font-size: 20px; }

/* ---------------- 设备兼容 ---------------- */
.devices {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 12px;
  padding: 28px; border-radius: var(--radius-lg);
  background: #fff; border: 1px solid var(--line);
}
.device {
  padding: 10px 20px; border-radius: 999px;
  background: var(--bg-soft); font-size: 14.5px; font-weight: 600; color: var(--ink-2);
}
.device:hover { background: var(--grad); color: #fff; }

/* ---------------- 用户评价 ---------------- */
.reviews { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.review {
  padding: 28px 26px; border-radius: var(--radius-lg);
  background: #fff; border: 1px solid var(--line);
}
.review__stars { color: #ffb020; font-size: 15px; letter-spacing: 2px; margin-bottom: 12px; }
.review p { font-size: 15px; color: var(--ink-2); margin-bottom: 18px; }
.review__who { display: flex; align-items: center; gap: 12px; }
.review__avatar {
  width: 40px; height: 40px; border-radius: 50%; display: grid; place-items: center;
  background: var(--grad-soft); color: var(--brand); font-weight: 800; font-size: 15px;
}
.review__who b { display: block; font-size: 14.5px; }
.review__who span { font-size: 12.5px; color: var(--ink-3); }

/* ---------------- FAQ ---------------- */
.faq { max-width: 820px; margin-inline: auto; display: flex; flex-direction: column; gap: 12px; }
.faq__item { border: 1px solid var(--line); border-radius: var(--radius); background: #fff; overflow: hidden; transition: .25s; }
.faq__item.is-open { border-color: rgba(22, 104, 255, .35); box-shadow: var(--shadow); }
.faq__q {
  width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 19px 22px; background: none; border: 0; cursor: pointer; text-align: left;
  font-size: 16px; font-weight: 700; color: var(--ink);
}
.faq__q i {
  flex-shrink: 0; width: 26px; height: 26px; border-radius: 50%;
  display: grid; place-items: center; background: var(--bg-soft); color: var(--brand);
  font-style: normal; font-size: 18px; transition: .3s;
}
.faq__item.is-open .faq__q i { background: var(--grad); color: #fff; transform: rotate(45deg); }
.faq__a { max-height: 0; overflow: hidden; transition: max-height .35s ease; }
.faq__a p { padding: 0 22px 20px; font-size: 15px; color: var(--ink-2); }

/* ---------------- CTA ---------------- */
.cta { padding: 0 0 90px; }
.cta__inner {
  position: relative; overflow: hidden;
  padding: 58px 40px; border-radius: 30px; text-align: center;
  background: linear-gradient(135deg, #0a3fb8, #1668ff 45%, #00b8ff);
  color: #fff;
}
.cta__inner::before {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(600px 260px at 20% 0%, rgba(255, 255, 255, .28), transparent 70%);
}
.cta__inner h2 { position: relative; font-size: clamp(25px, 3.2vw, 36px); font-weight: 900; margin-bottom: 12px; }
.cta__inner p { position: relative; font-size: 16.5px; opacity: .9; margin-bottom: 28px; }
.cta__btns { position: relative; display: flex; justify-content: center; flex-wrap: wrap; gap: 14px; }
.cta__btns .btn--ghost { background: rgba(255, 255, 255, .14); color: #fff; border-color: rgba(255, 255, 255, .45); }

/* ---------------- 页脚 ---------------- */
.footer { background: #0b1226; color: #a9b4cc; padding: 62px 0 26px; }
.footer__inner { display: grid; grid-template-columns: 1.5fr repeat(3, 1fr); gap: 38px; }
.footer__brand img { width: 44px; height: 44px; border-radius: 12px; margin-bottom: 14px; }
.footer__brand p { font-size: 14.5px; line-height: 1.8; max-width: 320px; }
.footer__col h4 { color: #fff; font-size: 15.5px; margin-bottom: 16px; }
.footer__col a { display: block; font-size: 14.5px; padding: 5px 0; transition: .2s; }
.footer__col a:hover { color: #fff; }
.footer__bottom {
  margin-top: 44px; padding-top: 22px; border-top: 1px solid rgba(255, 255, 255, .1);
  display: flex; flex-wrap: wrap; gap: 12px 24px; justify-content: space-between;
  font-size: 13.5px; color: #7f8ba6;
}

/* ---------------- 内页头部 ---------------- */
.page-head {
  position: relative; padding: 52px 0 44px; border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, var(--bg-soft), #fff);
}
.breadcrumb { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; font-size: 13.5px; color: var(--ink-3); margin-bottom: 14px; }
.breadcrumb a:hover { color: var(--brand); }
.page-head h1 { font-size: clamp(28px, 3.8vw, 42px); font-weight: 900; letter-spacing: -.3px; margin-bottom: 12px; }
.page-head p { color: var(--ink-2); font-size: 16.5px; max-width: 720px; }

/* ---------------- 下载页 ---------------- */
.dl-layout { display: grid; grid-template-columns: 1.55fr 1fr; gap: 30px; align-items: start; }
.dl-main {
  padding: 34px 32px; border-radius: var(--radius-lg);
  background: linear-gradient(150deg, rgba(22, 104, 255, .1), #fff 55%);
  border: 1px solid rgba(22, 104, 255, .28); box-shadow: 0 18px 44px rgba(22, 104, 255, .12);
}
.dl-tabs { display: flex; gap: 8px; margin-bottom: 24px; flex-wrap: wrap; }
.dl-tab {
  padding: 10px 22px; border-radius: 999px; cursor: pointer; font-size: 14.5px; font-weight: 700;
  background: #fff; border: 1px solid var(--line); color: var(--ink-2); transition: .22s;
}
.dl-tab:hover { color: var(--brand); }
.dl-tab.is-active { background: var(--grad); color: #fff; border-color: transparent; box-shadow: 0 8px 20px rgba(22, 104, 255, .3); }
.dl-pane { display: none; }
.dl-pane.is-active { display: block; }
.dl-pane__top { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.dl-pane__ico {
  width: 56px; height: 56px; border-radius: 16px; display: grid; place-items: center;
  background: var(--grad); color: #fff; font-size: 26px;
}
.dl-pane h2 { font-size: 24px; font-weight: 800; }
.dl-pane__ver { font-size: 13.5px; color: var(--brand); font-weight: 700; }
.dl-meta {
  display: flex; flex-wrap: wrap; gap: 10px 28px; margin: 22px 0 24px;
  padding: 16px 0; border-block: 1px solid var(--line); font-size: 14px; color: var(--ink-2);
}
.dl-meta b { color: var(--ink); }
.dl-btns { display: flex; flex-wrap: wrap; gap: 12px; }
.dl-note { margin-top: 14px; font-size: 12.8px; color: var(--ink-3); }
.mirror { display: flex; flex-direction: column; gap: 10px; margin-top: 22px; }
.mirror__row {
  display: flex; align-items: center; justify-content: space-between; gap: 14px; flex-wrap: wrap;
  padding: 13px 18px; border-radius: 14px; background: #fff; border: 1px solid var(--line);
  font-size: 14.5px; transition: .25s;
}
.mirror__row:hover { border-color: var(--brand); transform: translateY(-2px); }
.mirror__row b { font-size: 14.5px; }
.mirror__row span { font-size: 12.5px; color: var(--ink-3); }
.mirror__go { font-size: 13.5px; font-weight: 700; color: var(--brand); white-space: nowrap; }

.side { display: flex; flex-direction: column; gap: 18px; }
.side-card { padding: 24px 22px; border-radius: var(--radius); background: #fff; border: 1px solid var(--line); }
.side-card h3 { font-size: 17px; margin-bottom: 14px; }
.side-card ul { display: flex; flex-direction: column; gap: 11px; }
.side-card li { position: relative; padding-left: 20px; font-size: 14.2px; color: var(--ink-2); }
.side-card li::before {
  content: ""; position: absolute; left: 0; top: 9px;
  width: 7px; height: 7px; border-radius: 50%; background: var(--brand-2);
}
.side-card--warn { background: #fff7ed; border-color: #ffd9a8; }
.side-card--warn li::before { background: #f59e0b; }

.ver-table { border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: #fff; }
.ver-row {
  display: grid; grid-template-columns: 1.1fr .9fr .9fr 1fr auto;
  gap: 12px; align-items: center; padding: 14px 20px;
  font-size: 14px; color: var(--ink-2); border-bottom: 1px solid var(--line); transition: .2s;
}
.ver-row:last-child { border-bottom: 0; }
.ver-row:hover { background: var(--bg-soft); }
.ver-row--head { background: var(--bg-soft-2); font-weight: 800; font-size: 13.5px; color: var(--ink); }
.ver-row b { color: var(--ink); }
.mini-btn {
  padding: 7px 16px; border-radius: 999px; font-size: 13px; font-weight: 700;
  background: var(--bg-soft); border: 1px solid var(--line); color: var(--ink); transition: .22s; white-space: nowrap;
}
.mini-btn:hover { background: var(--grad); color: #fff; border-color: transparent; }

/* ---------------- 资讯列表 ---------------- */
.filters { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 30px; }
.filter {
  padding: 9px 20px; border-radius: 999px; cursor: pointer; font-size: 14px;
  background: #fff; border: 1px solid var(--line); color: var(--ink-2); transition: .22s;
}
.filter:hover { color: var(--brand); border-color: var(--brand); }
.filter.is-active { background: var(--grad); color: #fff; border-color: transparent; }
.posts { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.post-card {
  display: flex; flex-direction: column; border-radius: var(--radius-lg); overflow: hidden;
  background: #fff; border: 1px solid var(--line); transition: .3s;
}
.post-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: rgba(22, 104, 255, .35); }
.post-card__cover { height: 150px; position: relative; }
.post-card__cover span {
  position: absolute; left: 14px; top: 14px; font-size: 11.5px;
  padding: 4px 12px; border-radius: 999px; background: rgba(255, 255, 255, .9); color: var(--ink); font-weight: 700;
}
.post-card__body { padding: 20px 22px 24px; display: flex; flex-direction: column; flex: 1; }
.post-card__date { font-size: 12.5px; color: var(--ink-3); margin-bottom: 8px; }
.post-card__body h3 { font-size: 17.5px; line-height: 1.45; margin-bottom: 10px; transition: .2s; }
.post-card:hover .post-card__body h3 { color: var(--brand); }
.post-card__body p {
  font-size: 14px; color: var(--ink-2); flex: 1;
  display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden;
}
.post-card__more { margin-top: 16px; font-size: 13.5px; font-weight: 700; color: var(--brand); }
.post-card--wide { grid-column: span 2; }
.post-card--wide .post-card__cover { height: 200px; }
.pagination { display: flex; justify-content: center; gap: 8px; margin-top: 44px; }
.pagination button {
  min-width: 40px; height: 40px; padding: 0 12px; border-radius: 11px; cursor: pointer;
  background: #fff; border: 1px solid var(--line); color: var(--ink-2); font-size: 14px; transition: .22s;
}
.pagination button:hover { color: var(--brand); border-color: var(--brand); }
.pagination button.is-active { background: var(--grad); color: #fff; border-color: transparent; }

/* ---------------- 文章详情 ---------------- */
.post-layout { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 42px; align-items: start; }
.article { min-width: 0; }
.article__cover {
  height: 300px; border-radius: var(--radius-lg); position: relative; overflow: hidden; margin-bottom: 30px;
  background: linear-gradient(140deg, #1668ff, #3b82f6 45%, #00b8ff);
}
.article__cover::after {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(420px 220px at 20% 20%, rgba(255, 255, 255, .3), transparent 70%);
}
.article__cover span {
  position: absolute; left: 28px; bottom: 24px; z-index: 1;
  font-size: 12.5px; letter-spacing: 2px; font-weight: 700;
  padding: 6px 14px; border-radius: 999px; background: rgba(255, 255, 255, .22);
  backdrop-filter: blur(6px); color: #fff;
}
.article__meta {
  display: flex; flex-wrap: wrap; gap: 10px 24px; font-size: 13.5px; color: var(--ink-3);
  padding-bottom: 18px; margin-bottom: 24px; border-bottom: 1px solid var(--line);
}
.article__body { font-size: 16.3px; color: #2c3448; }
.article__body > * + * { margin-top: 19px; }
.article__body h2 {
  font-size: 24px; font-weight: 800; color: var(--ink); margin-top: 40px;
  scroll-margin-top: 96px; padding-left: 14px; border-left: 4px solid var(--brand);
}
.article__body h3 { font-size: 19px; font-weight: 700; color: var(--ink); margin-top: 28px; }
.article__body p { line-height: 1.9; }
.article__body ul { display: flex; flex-direction: column; gap: 10px; }
.article__body li { position: relative; padding-left: 24px; }
.article__body li::before {
  content: ""; position: absolute; left: 6px; top: 12px;
  width: 8px; height: 8px; border-radius: 2px; background: var(--grad); transform: rotate(45deg);
}
.article__body a { color: var(--brand); text-decoration: underline; text-underline-offset: 3px; }
.article__body strong { color: var(--ink); }
.article__body blockquote {
  padding: 18px 22px; border-radius: 14px; background: var(--bg-soft);
  border-left: 4px solid var(--brand-2); color: var(--ink-2); font-size: 15.5px;
}
.article__body code {
  font-family: Consolas, monospace; font-size: 14px; padding: 2px 7px;
  border-radius: 6px; background: var(--bg-soft-2); color: var(--brand-dark);
}
.callout {
  display: flex; gap: 14px; padding: 18px 22px; border-radius: 14px;
  background: rgba(0, 184, 255, .09); border: 1px solid rgba(0, 184, 255, .3);
  font-size: 15px; color: #0b4c63;
}
.callout__ico { font-size: 20px; line-height: 1.4; }
.article__tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 38px; }
.tag {
  font-size: 13px; padding: 6px 15px; border-radius: 999px;
  background: var(--bg-soft); border: 1px solid var(--line); color: var(--ink-2);
}
.tag:hover { border-color: var(--brand); color: var(--brand); }
.article__nav { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 32px; }
.article__nav a {
  padding: 18px 22px; border-radius: var(--radius); background: #fff;
  border: 1px solid var(--line); transition: .25s;
}
.article__nav a:hover { border-color: rgba(22, 104, 255, .4); transform: translateY(-3px); }
.article__nav small { display: block; font-size: 12px; color: var(--ink-3); margin-bottom: 4px; }
.article__nav b { font-size: 15px; }
.article__nav .is-next { text-align: right; }

.sidebar { position: sticky; top: calc(var(--nav-h) + 24px); display: flex; flex-direction: column; gap: 20px; }
.side-box { padding: 22px; border-radius: var(--radius); background: #fff; border: 1px solid var(--line); }
.side-box h4 { font-size: 15px; margin-bottom: 14px; }
.toc { display: flex; flex-direction: column; gap: 2px; }
.toc a {
  font-size: 14px; color: var(--ink-3); padding: 7px 12px; border-radius: 9px;
  border-left: 2px solid transparent; transition: .2s;
}
.toc a:hover { color: var(--brand); background: var(--bg-soft); }
.toc a.is-active { color: var(--brand); border-left-color: var(--brand); background: var(--bg-soft-2); font-weight: 700; }
.side-list { display: flex; flex-direction: column; gap: 14px; }
.side-list a { display: flex; gap: 12px; align-items: flex-start; }
.side-list a:hover .side-list__t { color: var(--brand); }
.side-list__n {
  flex-shrink: 0; width: 26px; height: 26px; border-radius: 8px; display: grid; place-items: center;
  font-size: 12.5px; font-weight: 800; background: var(--bg-soft-2); color: var(--brand);
}
.side-list__t { font-size: 14px; line-height: 1.5; transition: .2s; }
.side-cta {
  padding: 24px 22px; border-radius: var(--radius); text-align: center;
  background: var(--grad-soft); border: 1px solid rgba(22, 104, 255, .28);
}
.side-cta h4 { font-size: 17px; margin-bottom: 8px; }
.side-cta p { font-size: 13.5px; color: var(--ink-2); margin-bottom: 16px; }

/* ---------------- 404 ---------------- */
.error {
  min-height: calc(100vh - var(--nav-h) - 340px);
  display: grid; place-items: center; padding: 74px 0 90px; position: relative; overflow: hidden;
}
.error::before {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(600px 380px at 50% 30%, rgba(22, 104, 255, .14), transparent 70%);
}
.error__inner { position: relative; text-align: center; max-width: 660px; }
.error__code {
  font-size: clamp(110px, 20vw, 200px); font-weight: 900; line-height: 1; letter-spacing: -6px;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.error__emoji { font-size: 44px; margin: -6px 0 10px; animation: float 4s ease-in-out infinite; }
.error__inner h1 { font-size: clamp(22px, 3vw, 30px); margin-bottom: 12px; }
.error__inner p { color: var(--ink-2); font-size: 16px; margin-bottom: 28px; }
.error__search {
  display: flex; align-items: center; gap: 10px; max-width: 420px; margin: 0 auto 26px;
  padding: 8px 8px 8px 18px; border-radius: 999px; background: #fff; border: 1px solid var(--line);
}
.error__search input { flex: 1; min-width: 0; background: none; border: 0; outline: none; font-size: 14.5px; font-family: inherit; color: var(--ink); }
.error__search input::placeholder { color: var(--ink-3); }
.error__btns { display: flex; justify-content: center; flex-wrap: wrap; gap: 12px; }
.error__links { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px 26px; margin-top: 34px; font-size: 14px; }
.error__links a { color: var(--ink-3); transition: .2s; }
.error__links a:hover { color: var(--brand); }

/* ---------------- 回到顶部 ---------------- */
.to-top {
  position: fixed; right: 26px; bottom: 26px; z-index: 50;
  width: 46px; height: 46px; border-radius: 50%; cursor: pointer;
  display: grid; place-items: center; border: 0;
  background: var(--grad); color: #fff; box-shadow: var(--shadow-brand);
  opacity: 0; visibility: hidden; transform: translateY(12px); transition: .3s;
}
.to-top.is-show { opacity: 1; visibility: visible; transform: none; }
.to-top svg { width: 20px; height: 20px; stroke: currentColor; fill: none; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }

/* ---------------- 滚动动画 ---------------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s ease; }
.reveal.is-in { opacity: 1; transform: none; }

/* ---------------- 响应式 ---------------- */
@media (max-width: 1080px) {
  .features { grid-template-columns: repeat(2, 1fr); }
  .tools { grid-template-columns: repeat(3, 1fr); }
  .posts { grid-template-columns: repeat(2, 1fr); }
  .footer__inner { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 900px) {
  .nav__menu {
    position: fixed; inset: var(--nav-h) 0 auto 0; flex-direction: column; align-items: stretch;
    gap: 4px; margin: 0; padding: 16px 20px 24px;
    background: #fff; border-bottom: 1px solid var(--line);
    transform: translateY(-12px); opacity: 0; visibility: hidden; transition: .25s;
    box-shadow: 0 20px 40px rgba(13, 30, 80, .1);
  }
  .nav__menu.is-open { transform: none; opacity: 1; visibility: visible; }
  .burger { display: block; }
  .nav__actions .btn { display: none; }
  .hero__inner { grid-template-columns: 1fr; gap: 40px; }
  .hero__visual { min-height: 400px; }
  .chip--1 { left: 0; }
  .chip--2 { right: 0; }
  .stats { grid-template-columns: 1fr 1fr; }
  .steps { grid-template-columns: 1fr; }
  .reviews { grid-template-columns: 1fr; }
  .dl-layout { grid-template-columns: 1fr; }
  .post-layout { grid-template-columns: 1fr; }
  .sidebar { position: static; }
  .ver-row { grid-template-columns: 1.1fr .9fr .9fr; }
  .ver-row .mini-btn { grid-column: span 3; justify-self: start; }
}
@media (max-width: 640px) {
  .wrap { padding-inline: 16px; }
  .features { grid-template-columns: 1fr; }
  .tools { grid-template-columns: 1fr 1fr; }
  .posts { grid-template-columns: 1fr; }
  .post-card--wide { grid-column: span 1; }
  .post-card--wide .post-card__cover { height: 160px; }
  .article__cover { height: 190px; }
  .article__nav { grid-template-columns: 1fr; }
  .article__nav .is-next { text-align: left; }
  .cta__inner { padding: 42px 22px; border-radius: 22px; }
  .footer__inner { grid-template-columns: 1fr; gap: 30px; }
  .phone { width: 226px; height: 384px; }
  .stats { gap: 16px; padding: 22px 8px; }
  .ver-row { grid-template-columns: 1fr; gap: 6px; }
  .ver-row--head { display: none; }
  .ver-row .mini-btn { grid-column: span 1; }
  .error__links { gap: 8px 16px; }
}