/* ==========================================================
   一粟网络 YIISU NETWORK — 单页官网样式
   配色从 LOGO 派生：品牌蓝 #3888E8
   全站浅色统一：近白 ↔ 浅蓝灰交替，无深色区块
   ========================================================== */

:root {
  --bg: #fbfcfe;             /* 冷调近白 */
  --bg-tint: #eff4fa;        /* 浅蓝灰区块底 */
  --ink: #182430;            /* 带蓝调的墨色 */
  --ink-2: #5c6c7e;          /* 次级文字 */
  --blue: #3888e8;           /* 品牌蓝（LOGO 原色，图形/装饰） */
  --blue-deep: #1e66c8;      /* 深品牌蓝（按钮/链接/可读强调） */
  --hair: rgba(24, 36, 48, .15);          /* hairline */
  --hair-soft: rgba(24, 36, 48, .08);     /* 更浅一档 hairline */

  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
          "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --serif: "Songti SC", "Noto Serif SC", STSong, SimSun, Georgia, serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", Consolas,
          "Courier New", monospace;

  --pad: clamp(20px, 5vw, 72px);
  --sec-pad: clamp(88px, 13vw, 180px);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--blue-deep); color: #fff; }

/* 细滚动条 */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: #c3d2e4; border-radius: 0; }
::-webkit-scrollbar-thumb:hover { background: var(--blue-deep); }

a { color: inherit; text-decoration: none; }
ul { list-style: none; }
em { font-style: normal; }
sup { font-size: .55em; color: var(--blue-deep); margin-left: 2px; font-family: var(--mono); }

.wrap {
  max-width: 1440px;
  margin: 0 auto;
  padding-left: var(--pad);
  padding-right: var(--pad);
}

/* ---------- 噪点纹理 ---------- */
.noise {
  position: fixed;
  inset: 0;
  z-index: 9;
  pointer-events: none;
  opacity: .035;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='120' height='120' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ==========================================================
   顶部导航
   ========================================================== */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  border-bottom: 1px solid transparent;
  transition: background .3s, border-color .3s;
}
.site-header.scrolled {
  background: var(--bg);
  border-bottom-color: var(--hair);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.logo {
  display: flex;
  align-items: center;
  position: relative;
  z-index: 1;
}
.logo-img {
  height: clamp(34px, 4.5vw, 46px);
  width: auto;
  display: block;
}
.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(18px, 2.6vw, 36px);
}
.site-nav a {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: .04em;
  position: relative;
  padding: 5px 0;
}
.site-nav a::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 100%; height: 1.5px;
  background: var(--blue-deep);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform .28s;
}
.site-nav a:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}
.nav-cta {
  border: 1px solid var(--blue-deep);
  color: var(--blue-deep);
  padding: 9px 22px !important;
  font-size: 15px !important;
  transition: background .25s, color .25s, border-color .25s;
}
.nav-cta::after { display: none; }
.nav-cta:hover {
  background: var(--blue-deep);
  color: #fff;
}

/* 汉堡按钮（仅移动端） */
.menu-btn {
  display: none;
  width: 44px; height: 44px;
  background: none;
  border: none;
  cursor: pointer;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 7px;
  position: relative;
  z-index: 210;
}
.menu-btn span {
  display: block;
  width: 26px; height: 2px;
  background: var(--ink);
  transition: transform .3s;
}
body.menu-open .menu-btn span:nth-child(1) { transform: translateY(4.5px) rotate(45deg); }
body.menu-open .menu-btn span:nth-child(2) { transform: translateY(-4.5px) rotate(-45deg); }
/* 菜单展开时提升整个导航层级，否则汉堡按钮会被全屏菜单盖住无法关闭 */
body.menu-open .site-header { z-index: 210; }

/* 移动端全屏菜单 */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: var(--bg);
  display: flex;
  flex-direction: column;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity .35s, visibility .35s;
}
body.menu-open .mobile-menu {
  opacity: 1;
  visibility: visible;
}
.mobile-nav {
  display: flex;
  flex-direction: column;
}
.mobile-nav a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px var(--pad);
  font-size: clamp(20px, 5.5vw, 30px);
  font-weight: 800;
  color: var(--ink);
  border-bottom: 1px solid var(--hair);
  transform: translateY(20px);
  opacity: 0;
  transition: transform .4s, opacity .4s, color .2s;
}
.mobile-nav a i {
  font-style: normal;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--blue-deep);
}
.mobile-nav a:active { color: var(--blue-deep); }
body.menu-open .mobile-nav a {
  transform: translateY(0);
  opacity: 1;
}
.mobile-menu-foot {
  position: absolute;
  bottom: 28px;
  left: var(--pad);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--ink-2);
}

/* ==========================================================
   HERO
   ========================================================== */
.hero {
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-top: 120px;
  padding-bottom: 0;
}
.hero .wrap { width: 100%; }

.eyebrow {
  font-family: var(--mono);
  font-size: 14px;
  letter-spacing: .22em;
  color: var(--ink-2);
  margin-bottom: clamp(20px, 4vh, 48px);
}
.eyebrow b { color: var(--blue-deep); }

.hero-title {
  font-size: clamp(56px, 13.5vw, 192px);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: -.02em;
}
.hero-title .line {
  display: block;
  overflow: hidden;
}
.hero-title .line > span { display: inline-block; }

/* ---------- 首屏业务清单 ---------- */
.hero-biz {
  margin-top: clamp(30px, 5vh, 52px);
  border-top: 1px solid var(--hair);
}
.hero-biz a {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--hair);
}
.hero-biz i {
  font-style: normal;
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--blue-deep);
}
.hero-biz div { flex: 1; }
.hero-biz b {
  display: block;
  font-size: clamp(19px, 2.2vw, 26px);
  font-weight: 800;
  letter-spacing: -.01em;
  transition: color .25s;
}
.hero-biz span {
  display: block;
  font-size: 15px;
  color: var(--ink-2);
  margin-top: 2px;
}
.hero-biz .biz-arrow {
  font-style: normal;
  font-family: var(--mono);
  color: var(--blue-deep);
  transition: transform .25s;
}

.hero-main {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(300px, 4fr);
  gap: clamp(40px, 6vw, 96px);
  align-items: stretch;
  margin-bottom: clamp(24px, 4vh, 44px);
}
.hero-right {
  border-left: 1px solid var(--hair);
  padding-left: clamp(24px, 3vw, 48px);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 24px;
  padding-top: 4px;
  padding-bottom: 4px;
}
.hero-right-tag {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: .18em;
  color: var(--blue-deep);
}
.hero-right-link {
  align-self: flex-start;
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
  border-bottom: 1.5px solid var(--blue-deep);
  padding-bottom: 3px;
  transition: color .25s;
}
.hero-lede {
  font-size: clamp(17px, 1.6vw, 21px);
  line-height: 1.9;
  max-width: 480px;
  color: var(--ink-2);
}
.hero-lede strong { color: var(--ink); font-weight: 700; }

.hero-meta {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  border-top: 1px solid var(--hair);
  padding: 18px 0 22px;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--ink-2);
}
.scroll-hint { color: var(--blue-deep); animation: hint 2.2s ease-in-out infinite; }
@keyframes hint {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(4px); }
}

/* ==========================================================
   区块通用
   ========================================================== */
.sec { padding: var(--sec-pad) 0; }

.sec-head {
  display: flex;
  align-items: baseline;
  gap: 20px;
  border-top: 1px solid var(--ink);
  padding-top: 20px;
  margin-bottom: clamp(36px, 6vw, 72px);
  flex-wrap: wrap;
}
.sec-num {
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 600;
  color: var(--blue-deep);
  letter-spacing: .1em;
}
.sec-title {
  font-size: clamp(30px, 5.2vw, 64px);
  font-weight: 900;
  letter-spacing: -.01em;
  line-height: 1.1;
}
.sec-en {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: .2em;
  color: var(--ink-2);
  margin-left: auto;
}

.sec-lede {
  font-size: clamp(16px, 1.8vw, 21px);
  max-width: 640px;
  color: var(--ink-2);
  margin-bottom: clamp(40px, 6vw, 80px);
}
.sec-lede strong { color: var(--ink); }

/* ---------- 行式业务列表 ---------- */
.rows { border-bottom: 1px solid var(--hair); }
.row {
  display: grid;
  grid-template-columns: 90px 1fr auto;
  gap: 28px;
  align-items: start;
  border-top: 1px solid var(--hair);
  padding: clamp(28px, 4vw, 48px) 0;
  position: relative;
  transition: padding-left .3s;
}
.row::before {
  content: "";
  position: absolute;
  left: 0; top: 0;
  width: 0; height: 100%;
  background: rgba(56, 136, 232, .06);
  transition: width .3s;
}
.row-idx {
  font-family: var(--mono);
  font-size: 15px;
  color: var(--ink-2);
  padding-top: 8px;
}
.row-main h3 {
  font-size: clamp(22px, 2.6vw, 32px);
  font-weight: 800;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.row-new {
  font-size: 13px;
  font-weight: 600;
  font-family: var(--mono);
  letter-spacing: .08em;
  color: #fff;
  background: var(--blue-deep);
  padding: 3px 10px;
}
.row-main p {
  color: var(--ink-2);
  max-width: 620px;
  font-size: 16px;
}
.row-tags {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-top: 8px;
}
.row-tags li {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--ink-2);
  border: 1px solid var(--hair);
  padding: 4px 10px;
  white-space: nowrap;
  transition: border-color .25s, color .25s;
}

/* ==========================================================
   02 腾讯云代理（浅蓝灰）
   ========================================================== */
.sec-tint { background: var(--bg-tint); }

.cloud-grid {
  display: grid;
  grid-template-columns: minmax(320px, 5fr) 7fr;
  gap: clamp(40px, 6vw, 96px);
  align-items: start;
}
.cloud-intro { position: sticky; top: 110px; }
.cloud-intro .sec-lede { margin-bottom: 28px; }
.cloud-note {
  font-size: 15px;
  color: var(--ink);
  border-left: 2px solid var(--blue-deep);
  padding-left: 16px;
  margin-bottom: 40px;
}
.btn-line {
  display: inline-block;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .06em;
  border: 1px solid var(--ink);
  padding: 13px 32px;
  transition: background .25s, color .25s, border-color .25s;
}
.btn-line:hover {
  background: var(--blue-deep);
  border-color: var(--blue-deep);
  color: #fff;
}
.cloud-list li {
  display: grid;
  grid-template-columns: 170px 1fr;
  gap: 20px;
  align-items: baseline;
  padding: 24px 0;
  border-top: 1px solid var(--hair);
  transition: padding-left .25s;
}
.cloud-list li:last-child { border-bottom: 1px solid var(--hair); }
.cloud-list li:hover { padding-left: 12px; }
.cloud-list b {
  font-size: 18px;
  font-weight: 800;
}
.cloud-list b::before {
  content: "→ ";
  color: var(--blue-deep);
  font-family: var(--mono);
}
.cloud-list span {
  font-size: 15.5px;
  color: var(--ink-2);
}

/* ==========================================================
   03 解决方案
   ========================================================== */
.sol-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(28px, 4vw, 56px);
  margin-bottom: clamp(36px, 5vw, 64px);
}
.sol {
  border: 1px solid var(--hair);
  padding: clamp(28px, 3.5vw, 48px);
  position: relative;
  transition: border-color .3s;
}
.sol:hover { border-color: var(--blue-deep); }
.sol-num {
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 600;
  color: var(--blue-deep);
  display: block;
  margin-bottom: 18px;
}
.sol h3 {
  font-size: clamp(22px, 2.4vw, 30px);
  font-weight: 800;
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--hair);
}
.check-list li {
  position: relative;
  padding: 10px 0 10px 26px;
  font-size: 16px;
  color: var(--ink-2);
}
.check-list li::before {
  content: "→";
  position: absolute;
  left: 0;
  font-family: var(--mono);
  color: var(--blue-deep);
  font-weight: 700;
}

.sol-free {
  display: flex;
  align-items: baseline;
  gap: 20px;
  flex-wrap: wrap;
  border-top: 1px solid var(--ink);
  padding-top: 28px;
  max-width: 860px;
}
.sol-free-tag {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .1em;
  color: #fff;
  background: var(--blue-deep);
  padding: 5px 12px;
  white-space: nowrap;
}
.sol-free p { color: var(--ink-2); font-size: 16px; flex: 1 1 320px; }
.sol-free a {
  font-weight: 700;
  color: var(--blue-deep);
  white-space: nowrap;
  border-bottom: 1.5px solid var(--blue-deep);
  padding-bottom: 2px;
}
.sol-free a:hover { color: var(--ink); border-color: var(--ink); }

/* ==========================================================
   04 博客（浅蓝灰）
   ========================================================== */
.blog-card {
  display: block;
  background: var(--bg);
  border: 1px solid var(--hair);
  padding: clamp(32px, 4.5vw, 64px);
  position: relative;
  overflow: hidden;
  transition: border-color .3s, transform .3s;
}
.blog-card::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 100%; height: 4px;
  background: var(--blue);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .4s;
}
.blog-top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 24px;
}
.blog-name {
  font-size: clamp(30px, 4.6vw, 56px);
  font-weight: 900;
  letter-spacing: -.01em;
}
.blog-url {
  font-family: var(--mono);
  font-size: 15px;
  letter-spacing: .08em;
  color: var(--blue-deep);
  font-weight: 600;
}
.blog-slogan {
  font-family: var(--serif);
  font-size: clamp(18px, 2.2vw, 26px);
  margin-bottom: 14px;
}
.blog-desc {
  color: var(--ink-2);
  max-width: 680px;
  font-size: 16px;
  margin-bottom: 32px;
}
.blog-cta {
  display: inline-block;
  font-weight: 800;
  font-size: 15px;
  letter-spacing: .04em;
  color: var(--blue-deep);
  border-bottom: 2px solid currentColor;
  padding-bottom: 3px;
}

/* ==========================================================
   05 关于
   ========================================================== */
.verse {
  margin-bottom: clamp(44px, 6vw, 80px);
}
.verse p {
  font-family: var(--serif);
  font-size: clamp(26px, 4.6vw, 56px);
  line-height: 1.5;
  letter-spacing: .04em;
}
.verse cite {
  display: block;
  font-style: normal;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--ink-2);
  margin-top: 20px;
}
.about-cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(28px, 4vw, 64px);
  max-width: 1080px;
  margin-bottom: clamp(44px, 6vw, 80px);
}
.about-cols p {
  color: var(--ink-2);
  font-size: 16px;
}

.about-meta {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--hair);
}
.about-meta li {
  padding: 28px 24px 0 0;
}
.about-meta li + li { padding-left: 24px; border-left: 1px solid var(--hair); }
.about-meta b {
  display: block;
  font-size: 20px;
  font-weight: 800;
  margin-bottom: 8px;
}
.about-meta b::before {
  content: "● ";
  color: var(--blue-deep);
  font-size: 10px;
  vertical-align: 3px;
}
.about-meta span { font-size: 15px; color: var(--ink-2); }

/* ==========================================================
   页脚（浅蓝灰）
   ========================================================== */
.site-footer {
  background: var(--bg-tint);
  border-top: 1px solid var(--hair);
  padding: var(--sec-pad) 0 0;
}
.foot-eyebrow {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: .22em;
  color: var(--blue-deep);
  margin-bottom: 20px;
}
.foot-title {
  font-size: clamp(44px, 9vw, 120px);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -.02em;
  margin-bottom: 28px;
}
.foot-lede {
  color: var(--ink-2);
  max-width: 560px;
  font-size: 17px;
  margin-bottom: clamp(44px, 6vw, 72px);
}
.foot-contact {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  border-top: 1px solid var(--hair);
  margin-bottom: clamp(56px, 8vw, 100px);
}
.foot-contact li { padding: 26px 20px 26px 0; }
.foot-contact li + li { padding-left: 24px; border-left: 1px solid var(--hair); }
.foot-contact span {
  display: block;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: .18em;
  color: var(--ink-2);
  margin-bottom: 10px;
}
.foot-contact b { font-size: clamp(16px, 1.8vw, 20px); font-weight: 700; }
.foot-contact a { border-bottom: 1.5px solid transparent; transition: border-color .25s, color .25s; }
.foot-contact a:hover { color: var(--blue-deep); border-color: var(--blue-deep); }

.foot-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  border-top: 1px solid var(--hair);
  padding: 22px 0;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--ink-2);
}
.foot-links { display: flex; flex-wrap: wrap; gap: 10px 22px; }
.foot-links a:hover { color: var(--blue-deep); }

/* ---------- 复制微信号按钮 ---------- */
.copy-btn {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .06em;
  color: var(--blue-deep);
  background: none;
  border: 1px solid var(--hair);
  padding: 2px 10px;
  margin-left: 10px;
  cursor: pointer;
  vertical-align: 2px;
  transition: border-color .25s, color .25s, background .25s;
}
.copy-btn.copied {
  color: #fff;
  background: var(--blue-deep);
  border-color: var(--blue-deep);
}

/* ==========================================================
   返回顶部
   ========================================================== */
.back-top {
  position: fixed;
  right: clamp(16px, 3vw, 40px);
  bottom: clamp(16px, 4vh, 40px);
  z-index: 90;
  width: 44px;
  height: 44px;
  background: var(--bg);
  border: 1px solid var(--ink);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity .3s, visibility .3s, transform .3s, background .25s, color .25s, border-color .25s;
}
.back-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* ==========================================================
   入场动画
   ========================================================== */
.anim {
  opacity: 0;
  transform: translateY(28px);
  animation: fadeUp .8s cubic-bezier(.2, .65, .25, 1) forwards;
  animation-delay: var(--d, 0s);
}
@keyframes fadeUp {
  to { opacity: 1; transform: translateY(0); }
}

.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity .7s cubic-bezier(.2, .65, .25, 1), transform .7s cubic-bezier(.2, .65, .25, 1);
  transition-delay: var(--d, 0s);
}
.reveal.in {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .anim { animation: none; opacity: 1; transform: none; }
  .reveal { transition: none; opacity: 1; transform: none; }
  .scroll-hint { animation: none; }
}

/* ==========================================================
   悬停效果：仅在支持 hover 的设备（鼠标）生效，避免触屏点击后残留
   ========================================================== */
@media (hover: hover) {
  .row:hover { padding-left: 14px; }
  .row:hover::before { width: 100%; }
  .row:hover .row-tags li { border-color: var(--blue-deep); color: var(--blue-deep); }
  .blog-card:hover {
    border-color: var(--blue-deep);
    transform: translateY(-4px);
  }
  .blog-card:hover::after { transform: scaleX(1); }
  .hero-biz a:hover .biz-arrow { transform: translateX(6px); }
  .hero-biz a:hover b { color: var(--blue-deep); }
  .hero-right-link:hover { color: var(--blue-deep); }
  .back-top:hover {
    background: var(--blue-deep);
    border-color: var(--blue-deep);
    color: #fff;
  }
}

/* ==========================================================
   响应式
   ========================================================== */
@media (max-width: 1080px) {
  .cloud-grid { grid-template-columns: 1fr; }
  .cloud-intro { position: static; }
  .hero-main { grid-template-columns: 1fr; gap: 32px; }
  .hero-right { border-left: none; padding-left: 0; }
}

@media (max-width: 860px) {
  /* 移动端整体收紧节奏 */
  :root { --sec-pad: clamp(56px, 15vw, 72px); }

  .site-nav { display: none; }
  .menu-btn { display: flex; }

  /* 首屏：高度由内容自然撑起，外紧内松——外部不留大片空白，内部间距拉开 */
  .hero {
    min-height: auto;
    justify-content: flex-start;
    padding-top: 104px;
    padding-bottom: 4px;
  }
  .hero-title { line-height: 1.14; }
  .eyebrow { margin-bottom: 32px; }
  .hero-main { gap: 24px; margin-bottom: 0; }
  .hero-biz a { gap: 12px; padding: 13px 0; }
  .hero-meta { flex-wrap: wrap; gap: 12px 24px; padding: 18px 0 20px; }
  .scroll-hint { display: inline; }

  .sec-head { gap: 14px; margin-bottom: 32px; }
  .sec-en { margin-left: 0; width: 100%; }
  .sec-lede { margin-bottom: 32px; }

  /* 业务行 */
  .row {
    grid-template-columns: 1fr;
    gap: 10px;
    padding: 22px 0;
  }
  .row-idx { padding-top: 0; }
  .row-tags { flex-direction: row; flex-wrap: wrap; padding-top: 2px; }

  /* 腾讯云清单：窄屏单列堆叠 */
  .cloud-grid { gap: 36px; }
  .cloud-intro .sec-lede { margin-bottom: 20px; }
  .cloud-note { margin-bottom: 28px; }
  .cloud-list li {
    grid-template-columns: 1fr;
    gap: 6px;
    padding: 18px 0;
  }

  /* 解决方案卡片 */
  .sol-grid { grid-template-columns: 1fr; gap: 16px; margin-bottom: 28px; }
  .sol { padding: 24px 22px; }
  .sol h3 { margin-bottom: 16px; padding-bottom: 14px; }
  .sol-free { padding-top: 20px; gap: 12px; }

  /* 博客卡 */
  .blog-card { padding: 26px 22px; }
  .blog-top { margin-bottom: 16px; }
  .blog-desc { margin-bottom: 22px; }

  /* 关于 */
  .verse { margin-bottom: 36px; }
  .about-cols { grid-template-columns: 1fr; gap: 18px; margin-bottom: 36px; }
  .about-meta { grid-template-columns: 1fr; }
  .about-meta li { padding: 18px 0 0 !important; border-left: none !important; }
  .about-meta li + li { border-top: 1px solid var(--hair); margin-top: 18px; }

  /* 页脚 */
  .foot-contact { grid-template-columns: 1fr; margin-bottom: 44px; }
  .foot-contact li { padding: 18px 0 !important; border-left: none !important; }
  .foot-contact li + li { border-top: 1px solid var(--hair); }
}