/* ============================================================
   上海孖联智能科技有限公司 · 办公设备租赁子站样式
   oa.zlinke.cn
   ============================================================ */

/* ---------- 设计变量：与主站保持一致 ---------- */
:root {
  --ink-900: #03080F;
  --ink-800: #06101F;
  --ink-700: #0B1A2E;
  --ink-600: #12233C;

  --brand-700: #0940C4;
  --brand-600: #0B54E8;
  --brand-500: #1A73FF;
  --brand-400: #4D96FF;
  --brand-300: #9CC4FF;

  --cyan-400: #00D2EE;
  --teal-400: #00E4AE;

  --paper: #F5F8FC;
  --paper-2: #EDF2F9;
  --white: #FFFFFF;

  --line: #E3EAF4;
  --line-dark: rgba(255, 255, 255, .10);

  --text: #0F1E33;
  --text-2: #33455F;
  --muted: #64758D;

  --grad: linear-gradient(118deg, #0B54E8 0%, #1A73FF 42%, #00D2EE 100%);

  --r-xs: 8px;
  --r-sm: 12px;
  --r-md: 16px;
  --r-lg: 22px;
  --r-xl: 28px;

  --sh-sm: 0 2px 8px rgba(15, 30, 51, .05);
  --sh-md: 0 12px 32px rgba(15, 30, 51, .09);
  --sh-lg: 0 26px 64px rgba(3, 8, 15, .18);
  --sh-brand: 0 14px 38px rgba(10, 84, 232, .40);

  --wrap: 1200px;
  --ease: cubic-bezier(.16, .84, .44, 1);
}

/* ---------- 基础重置 ---------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--white);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "HarmonyOS Sans SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img, svg { max-width: 100%; }
h1, h2, h3, h4, h5 { margin: 0; line-height: 1.3; font-weight: 700; letter-spacing: -.01em; }
p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }
button { font: inherit; border: 0; background: none; cursor: pointer; color: inherit; }
input, select, textarea { font: inherit; color: inherit; }

.sprite { position: absolute; width: 0; height: 0; overflow: hidden; }

.ico {
  width: 1em; height: 1em;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
  flex: none;
}

.wrap { width: min(100% - 40px, var(--wrap)); margin-inline: auto; }

/* ---------- 入场动画 ----------
   必须置于组件样式之前，否则 .reveal.in 的 transform 会覆盖卡片自身
   :hover 位移（两者特异度相同，靠源码顺序决胜）。 */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .8s var(--ease), transform .8s var(--ease);
}
.reveal.in { opacity: 1; transform: none; }

/* ---------- 通用按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 14px 26px;
  border-radius: 999px;
  font-size: 15px; font-weight: 600;
  letter-spacing: .01em;
  white-space: nowrap;
  transition: transform .25s var(--ease), box-shadow .25s var(--ease),
              background .25s var(--ease), color .25s var(--ease), border-color .25s var(--ease);
}
.btn .ico { width: 17px; height: 17px; transition: transform .25s var(--ease); }
.btn:hover .ico { transform: translateX(3px); }

.btn-primary { background: var(--grad); color: #fff; box-shadow: var(--sh-brand); }
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 20px 46px rgba(10, 84, 232, .50); }

.btn-ghost {
  color: #fff;
  border: 1px solid rgba(255, 255, 255, .28);
  background: rgba(255, 255, 255, .06);
  backdrop-filter: blur(6px);
}
.btn-ghost:hover { background: rgba(255, 255, 255, .14); border-color: rgba(255, 255, 255, .5); }

.btn-sm { padding: 10px 20px; font-size: 14px; }
.btn-block { width: 100%; }

/* ============================================================
   顶部导航
   ============================================================ */
.site-header {
  position: fixed; inset: 0 0 auto 0;
  z-index: 90;
  padding: 14px 0;
  transition: background .35s var(--ease), box-shadow .35s var(--ease), padding .35s var(--ease);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; }

.brand { display: flex; align-items: center; gap: 12px; flex: none; }
.brand-mark { display: flex; align-items: center; }
.brand-mark img {
  height: 52px; width: auto; display: block;
  transform: translateY(6px);
  transition: filter .35s var(--ease), height .35s var(--ease);
}
.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-text strong { font-size: 17px; font-weight: 700; color: #fff; letter-spacing: .04em; }
.brand-sub {
  font-size: 10px; font-weight: 500; letter-spacing: .12em;
  color: rgba(255, 255, 255, .52);
  margin-top: 3px;
}

.nav { display: flex; align-items: center; gap: 4px; }
.nav-link {
  padding: 9px 13px;
  border-radius: 999px;
  font-size: 14.5px; font-weight: 500;
  color: rgba(255, 255, 255, .74);
  transition: color .25s var(--ease), background .25s var(--ease);
}
.nav-link:hover { color: #fff; background: rgba(255, 255, 255, .08); }
.nav-link.is-active { color: #fff; }
.nav-link.is-active::after {
  content: ""; display: block;
  width: 16px; height: 2px; margin: 4px auto 0;
  border-radius: 2px; background: var(--cyan-400);
}
.nav-external { display: inline-flex; align-items: center; gap: 4px; color: rgba(255, 255, 255, .5); font-size: 13.5px; }
.nav-external .ico { width: 13px; height: 13px; }
.nav-cta { margin-left: 10px; }
.nav-cta:hover .ico { transform: none; }

/* 滚动后：白底反色 */
.site-header.is-stuck {
  background: rgba(255, 255, 255, .92);
  backdrop-filter: blur(14px) saturate(150%);
  box-shadow: 0 1px 0 rgba(15, 30, 51, .07), 0 10px 30px rgba(15, 30, 51, .06);
  padding: 8px 0;
}
.site-header.is-stuck .brand-mark img { filter: invert(1); height: 48px; }
.site-header.is-stuck .brand-text strong { color: var(--text); }
.site-header.is-stuck .brand-sub { color: var(--muted); }
.site-header.is-stuck .nav-link { color: var(--text-2); }
.site-header.is-stuck .nav-link:hover { background: var(--paper-2); color: var(--text); }
.site-header.is-stuck .nav-link.is-active { color: var(--brand-600); }
.site-header.is-stuck .nav-link.is-active::after { background: var(--brand-500); }
.site-header.is-stuck .nav-external { color: var(--muted); }
.site-header.is-stuck .nav-toggle { color: var(--text); }

.nav-toggle {
  display: none;
  width: 44px; height: 44px;
  align-items: center; justify-content: center;
  border-radius: 12px;
  color: #fff;
  background: rgba(255, 255, 255, .08);
  border: 1px solid rgba(255, 255, 255, .16);
}
.nav-toggle .ico { width: 22px; height: 22px; }
.nav-toggle .ico-close { display: none; }
.nav-toggle[aria-expanded="true"] .ico-close { display: block; }
.nav-toggle[aria-expanded="true"] > .ico:not(.ico-close) { display: none; }

/* ============================================================
   Hero
   ============================================================ */
.hero {
  position: relative;
  background:
    radial-gradient(1100px 620px at 78% -12%, rgba(26, 115, 255, .30), transparent 62%),
    radial-gradient(800px 520px at 8% 108%, rgba(0, 210, 238, .16), transparent 64%),
    linear-gradient(168deg, #03080F 0%, #06101F 46%, #0B1A2E 100%);
  color: #fff;
  padding: 148px 0 76px;
  overflow: hidden;
}
.hero-bg { position: absolute; inset: 0; pointer-events: none; }
.glow { position: absolute; border-radius: 50%; filter: blur(90px); opacity: .5; }
.glow-a { width: 420px; height: 420px; top: -140px; right: 6%; background: rgba(26, 115, 255, .55); }
.glow-b { width: 340px; height: 340px; bottom: -120px; left: 2%; background: rgba(0, 228, 174, .28); }
.grid-lines {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, .045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .045) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 82% 62% at 50% 30%, #000 30%, transparent 78%);
  -webkit-mask-image: radial-gradient(ellipse 82% 62% at 50% 30%, #000 30%, transparent 78%);
}

.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(0, .98fr);
  gap: 56px;
  align-items: center;
}

.eyebrow {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 7px 15px 7px 11px;
  border-radius: 999px;
  font-size: 13px; font-weight: 600; letter-spacing: .04em;
  color: var(--brand-300);
  background: rgba(26, 115, 255, .12);
  border: 1px solid rgba(77, 150, 255, .28);
}
.pulse {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--teal-400);
  box-shadow: 0 0 0 0 rgba(0, 228, 174, .6);
  animation: pulse 2.4s infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(0, 228, 174, .55); }
  70% { box-shadow: 0 0 0 9px rgba(0, 228, 174, 0); }
  100% { box-shadow: 0 0 0 0 rgba(0, 228, 174, 0); }
}

.hero h1 {
  margin: 22px 0 0;
  font-size: clamp(34px, 4.4vw, 58px);
  line-height: 1.16;
  letter-spacing: -.025em;
}
.hero h1 em {
  font-style: normal;
  background: linear-gradient(100deg, #4D96FF 0%, #00D2EE 62%, #00E4AE 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-sub {
  margin-top: 22px;
  max-width: 560px;
  font-size: 16.5px;
  line-height: 1.85;
  color: rgba(255, 255, 255, .70);
}
.hero-sub strong { color: #fff; font-weight: 600; }

.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 32px; }

.hero-points {
  display: grid;
  gap: 10px;
  margin-top: 34px;
  padding-top: 26px;
  border-top: 1px solid rgba(255, 255, 255, .09);
}
.hero-points li {
  display: flex; align-items: center; gap: 10px;
  font-size: 14.5px;
  color: rgba(255, 255, 255, .74);
}
.hero-points .ico { width: 16px; height: 16px; color: var(--teal-400); stroke-width: 2.4; }

/* ---------- Hero 右侧：服务清单 ---------- */
.hero-visual {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
}

.device-panel {
  position: relative;
  width: 100%;
  border-radius: var(--r-lg);
  padding: 22px;
  background: linear-gradient(160deg, rgba(18, 35, 60, .92), rgba(6, 16, 31, .96));
  border: 1px solid rgba(255, 255, 255, .12);
  box-shadow: 0 30px 70px rgba(0, 0, 0, .45);
}
.device-panel::before {
  content: "";
  position: absolute; inset: -1px -1px auto -1px; height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0, 210, 238, .7), transparent);
}

.panel-head {
  display: flex; align-items: center; justify-content: space-between;
  padding-bottom: 16px;
  border-bottom: 1px solid rgba(255, 255, 255, .08);
}
.panel-title { display: inline-flex; align-items: center; gap: 9px; font-size: 14px; font-weight: 600; color: rgba(255, 255, 255, .9); }
.dot-live {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--teal-400);
  box-shadow: 0 0 8px rgba(0, 228, 174, .9);
}
.panel-tag {
  font-size: 11.5px; font-weight: 600; letter-spacing: .08em;
  padding: 3px 10px; border-radius: 999px;
  color: var(--cyan-400);
  background: rgba(0, 210, 238, .12);
  border: 1px solid rgba(0, 210, 238, .26);
}

.device-list { display: grid; gap: 2px; margin-top: 6px; }
.device-list li {
  display: flex; align-items: center; gap: 13px;
  padding: 13px 4px;
  border-bottom: 1px solid rgba(255, 255, 255, .05);
}
.device-list li:last-child { border-bottom: 0; }
.dev-ico {
  width: 34px; height: 34px; flex: none;
  display: grid; place-items: center;
  border-radius: 9px;
  color: var(--brand-300);
  background: rgba(77, 150, 255, .12);
}
.dev-ico .ico { width: 18px; height: 18px; }
.dev-main { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.dev-main strong { font-size: 14px; font-weight: 600; color: #fff; }
.dev-main em { font-style: normal; font-size: 12px; color: rgba(255, 255, 255, .46); }
.dev-state {
  margin-left: auto; flex: none;
  font-size: 11.5px; font-weight: 600;
  padding: 3px 9px; border-radius: 999px;
  color: rgba(255, 255, 255, .5);
  background: rgba(255, 255, 255, .06);
  border: 1px solid rgba(255, 255, 255, .1);
}
.dev-state.is-on { color: var(--teal-400); background: rgba(0, 228, 174, .1); border-color: rgba(0, 228, 174, .22); }

.panel-foot {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  margin-top: 14px; padding-top: 15px;
  border-top: 1px solid rgba(255, 255, 255, .08);
  font-size: 12.5px;
  color: rgba(255, 255, 255, .5);
}
.foot-badge { color: rgba(255, 255, 255, .68); }

/* 支出形态胶囊：置于面板上方，不遮挡任何内容 */
.float-card {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  padding: 8px 16px 8px 15px;
  border-radius: 999px;
  background: rgba(255, 255, 255, .06);
  border: 1px solid rgba(255, 255, 255, .14);
  backdrop-filter: blur(8px);
}
.fc-label { font-size: 11.5px; letter-spacing: .04em; color: rgba(255, 255, 255, .48); }
.fc-value { font-size: 13.5px; font-weight: 600; color: #fff; }
.fc-note {
  font-size: 11.5px;
  color: rgba(255, 255, 255, .42);
  padding-left: 10px;
  border-left: 1px solid rgba(255, 255, 255, .14);
}

/* ---------- Hero 底部统计 ---------- */
.stat-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  margin-top: 72px;
  padding: 26px 32px;
  border-radius: var(--r-lg);
  background: rgba(255, 255, 255, .045);
  border: 1px solid rgba(255, 255, 255, .1);
  backdrop-filter: blur(8px);
}
.stat { position: relative; }
.stat + .stat { padding-left: 22px; border-left: 1px solid rgba(255, 255, 255, .1); }
.stat-num {
  font-size: 34px; font-weight: 700; line-height: 1;
  background: linear-gradient(100deg, #fff, #9CC4FF);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.stat-unit { font-size: 14px; font-weight: 600; color: rgba(255, 255, 255, .6); margin-left: 5px; }
.stat p { margin-top: 8px; font-size: 13.5px; color: rgba(255, 255, 255, .58); }

/* ============================================================
   通用板块
   ============================================================ */
.section { padding: 96px 0; }
.section-alt { background: var(--paper); }

.sec-tag {
  display: inline-block;
  font-size: 12.5px; font-weight: 700; letter-spacing: .16em;
  color: var(--brand-600);
  padding: 5px 12px;
  border-radius: 999px;
  background: rgba(26, 115, 255, .08);
  border: 1px solid rgba(26, 115, 255, .16);
}
.sec-head { max-width: 680px; margin-bottom: 52px; }
.sec-head h2 {
  margin: 18px 0 0;
  font-size: clamp(26px, 3vw, 38px);
  line-height: 1.28;
  letter-spacing: -.02em;
}
.sec-desc { margin-top: 14px; font-size: 16px; color: var(--muted); line-height: 1.85; }

/* ---------- 设备品类 ---------- */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}

.dev-card {
  padding: 30px 28px;
  border-radius: var(--r-lg);
  background: var(--white);
  border: 1px solid var(--line);
  box-shadow: var(--sh-sm);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s var(--ease);
}
.dev-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--sh-md);
  border-color: rgba(26, 115, 255, .28);
}
.dev-card-ico {
  display: grid; place-items: center;
  width: 48px; height: 48px;
  border-radius: 13px;
  color: var(--brand-600);
  background: linear-gradient(140deg, rgba(26, 115, 255, .12), rgba(0, 210, 238, .10));
  border: 1px solid rgba(26, 115, 255, .14);
}
.dev-card-ico .ico { width: 24px; height: 24px; }
.dev-card h3 { margin: 20px 0 10px; font-size: 18.5px; }
.dev-card > p { font-size: 14.5px; line-height: 1.85; color: var(--text-2); }

.tiny-list { display: grid; gap: 7px; margin-top: 18px; padding-top: 16px; border-top: 1px dashed var(--line); }
.tiny-list li {
  position: relative;
  padding-left: 16px;
  font-size: 13px;
  color: var(--muted);
}
.tiny-list li::before {
  content: "";
  position: absolute; left: 2px; top: 10px;
  width: 5px; height: 5px; border-radius: 50%;
  background: var(--brand-400);
}

/* ---------- 租赁模式 ---------- */
.plan-grid { align-items: stretch; }
.plan-card {
  position: relative;
  display: flex; flex-direction: column;
  padding: 32px 30px;
  border-radius: var(--r-lg);
  background: var(--white);
  border: 1px solid var(--line);
  box-shadow: var(--sh-sm);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease);
}
.plan-card:hover { transform: translateY(-5px); box-shadow: var(--sh-md); }
.plan-card.is-featured {
  background: linear-gradient(168deg, #06101F, #0B1A2E 60%, #12233C);
  border-color: rgba(77, 150, 255, .34);
  box-shadow: 0 24px 56px rgba(6, 16, 31, .28);
}
.plan-card.is-featured h3,
.plan-card.is-featured .plan-desc { color: #fff; }
.plan-card.is-featured .plan-desc { color: rgba(255, 255, 255, .68); }
.plan-card.is-featured .plan-list li { color: rgba(255, 255, 255, .78); }
.plan-card.is-featured .plan-list .ico { color: var(--teal-400); }
.plan-card.is-featured .plan-fit {
  color: var(--cyan-400);
  border-top-color: rgba(255, 255, 255, .12);
}

.plan-kicker {
  font-size: 12px; font-weight: 700; letter-spacing: .14em;
  color: var(--brand-500);
}
.plan-card.is-featured .plan-kicker { color: var(--brand-300); }
.plan-card h3 { margin: 10px 0 12px; font-size: 22px; }
.plan-desc { font-size: 14.5px; line-height: 1.85; color: var(--text-2); }

.plan-list { display: grid; gap: 10px; margin: 22px 0; }
.plan-list li {
  display: flex; align-items: flex-start; gap: 9px;
  font-size: 14px;
  color: var(--text-2);
}
.plan-list .ico { width: 15px; height: 15px; margin-top: 5px; color: var(--brand-600); stroke-width: 2.4; }

.plan-fit {
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  color: var(--muted);
}

/* ---------- 服务优势 ---------- */
.adv-layout {
  display: grid;
  grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr);
  gap: 64px;
  align-items: start;
}
.adv-copy { position: sticky; top: 108px; }
.adv-copy h2 {
  margin: 18px 0 0;
  font-size: clamp(26px, 3vw, 38px);
  line-height: 1.3;
  letter-spacing: -.02em;
}
.adv-copy .hl {
  position: relative;
  color: var(--brand-600);
}
.adv-copy .hl::after {
  content: "";
  position: absolute; left: 0; right: 0; bottom: 2px; height: 7px;
  background: rgba(0, 210, 238, .22);
  border-radius: 3px;
  z-index: -1;
}
.adv-copy > p { margin-top: 20px; font-size: 15.5px; line-height: 1.95; color: var(--text-2); }
.adv-note {
  display: flex; align-items: flex-start; gap: 10px;
  margin-top: 26px; padding: 16px 18px;
  border-radius: var(--r-md);
  background: var(--paper);
  border: 1px solid var(--line);
  font-size: 13.5px;
  color: var(--text-2);
}
.adv-note .ico { width: 17px; height: 17px; margin-top: 3px; color: var(--brand-600); flex: none; }

.adv-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
.adv-item {
  padding: 26px 24px;
  border-radius: var(--r-md);
  background: var(--white);
  border: 1px solid var(--line);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s var(--ease);
}
.adv-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--sh-md);
  border-color: rgba(26, 115, 255, .24);
}
.adv-ico {
  display: grid; place-items: center;
  width: 40px; height: 40px;
  border-radius: 11px;
  color: var(--brand-600);
  background: rgba(26, 115, 255, .09);
}
.adv-ico .ico { width: 20px; height: 20px; }
.adv-item h3 { margin: 16px 0 8px; font-size: 16px; }
.adv-item p { font-size: 13.5px; line-height: 1.8; color: var(--muted); }

/* ---------- 服务流程 ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  counter-reset: step;
}
.step {
  position: relative;
  padding: 30px 26px 28px;
  border-radius: var(--r-lg);
  background: var(--white);
  border: 1px solid var(--line);
  box-shadow: var(--sh-sm);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease);
}
.step:hover { transform: translateY(-4px); box-shadow: var(--sh-md); }
.step-idx {
  display: inline-block;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 26px; font-weight: 700; line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1.4px rgba(26, 115, 255, .42);
}
.step h3 { margin: 14px 0 8px; font-size: 17px; }
.step p { font-size: 13.5px; line-height: 1.8; color: var(--muted); }
.step::after {
  content: "";
  position: absolute; top: 42px; right: -11px;
  width: 22px; height: 1px;
  background: linear-gradient(90deg, rgba(26, 115, 255, .45), transparent);
}
.step:nth-child(3n)::after,
.step:last-child::after { display: none; }

/* ---------- 常见问题 ---------- */
.faq-layout {
  display: grid;
  grid-template-columns: minmax(0, .78fr) minmax(0, 1.22fr);
  gap: 64px;
  align-items: start;
}
.faq-head { position: sticky; top: 108px; margin-bottom: 0; }
.faq-head h2 { font-size: clamp(23px, 2.2vw, 30px); }
.faq-btn { margin-top: 28px; }

.faq-list { display: grid; gap: 12px; }
.faq-item {
  border-radius: var(--r-md);
  background: var(--white);
  border: 1px solid var(--line);
  overflow: hidden;
  transition: border-color .3s var(--ease), box-shadow .3s var(--ease);
}
.faq-item.is-open {
  border-color: rgba(26, 115, 255, .3);
  box-shadow: 0 10px 28px rgba(15, 30, 51, .07);
}
.faq-q {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  width: 100%;
  padding: 20px 24px;
  text-align: left;
  font-size: 15.5px; font-weight: 600;
  color: var(--text);
}
.faq-q .ico {
  width: 18px; height: 18px; flex: none;
  color: var(--brand-600);
  transition: transform .3s var(--ease);
}
.faq-item.is-open .faq-q .ico { transform: rotate(45deg); }
.faq-a {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows .34s var(--ease);
}
.faq-item.is-open .faq-a { grid-template-rows: 1fr; }
.faq-a > p {
  overflow: hidden;
  padding: 0 24px;
  font-size: 14px;
  line-height: 1.9;
  color: var(--text-2);
  transition: padding .34s var(--ease);
}
.faq-item.is-open .faq-a > p { padding: 0 24px 22px; }

/* ---------- 联系我们 ---------- */
.contact-sec {
  background:
    radial-gradient(860px 480px at 12% 0%, rgba(26, 115, 255, .07), transparent 62%),
    var(--paper);
}
.contact-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 60px;
  align-items: start;
}
.contact-copy h2 {
  margin: 18px 0 0;
  font-size: clamp(25px, 2.8vw, 36px);
  line-height: 1.32;
  letter-spacing: -.02em;
}
.contact-lead { margin-top: 16px; font-size: 15.5px; line-height: 1.9; color: var(--text-2); }

.contact-info { display: grid; gap: 22px; margin-top: 38px; }
.contact-info li { display: flex; align-items: flex-start; gap: 14px; }
.ci-ico {
  display: grid; place-items: center;
  width: 42px; height: 42px; flex: none;
  border-radius: 12px;
  color: var(--brand-600);
  background: var(--white);
  border: 1px solid var(--line);
  box-shadow: var(--sh-sm);
}
.ci-ico .ico { width: 19px; height: 19px; }
.contact-info h4 { font-size: 13px; font-weight: 600; color: var(--muted); letter-spacing: .04em; }
.contact-info p { margin-top: 3px; font-size: 15.5px; font-weight: 600; color: var(--text); }
.contact-info p a { transition: color .2s var(--ease); }
.contact-info p a:hover { color: var(--brand-600); }
.contact-info em {
  display: block;
  margin-top: 3px;
  font-style: normal; font-size: 12.5px; font-weight: 400;
  color: var(--muted);
}

.contact-form {
  padding: 34px 32px;
  border-radius: var(--r-lg);
  background: var(--white);
  border: 1px solid var(--line);
  box-shadow: 0 20px 52px rgba(15, 30, 51, .09);
}
.contact-form h3 { font-size: 20px; }
.form-sub { margin-top: 6px; font-size: 12.5px; color: var(--muted); }
.req { color: #DC2B2B; }

.field { margin-top: 18px; display: grid; gap: 7px; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.field label { font-size: 13px; font-weight: 600; color: var(--text-2); }
.field input,
.field select,
.field textarea {
  width: 100%;
  padding: 11px 14px;
  border-radius: var(--r-sm);
  border: 1px solid var(--line);
  background: var(--paper);
  font-size: 14px;
  outline: none;
  transition: border-color .22s var(--ease), background .22s var(--ease), box-shadow .22s var(--ease);
}
.field textarea { resize: vertical; min-height: 88px; line-height: 1.7; }
.field select { appearance: none; cursor: pointer; }
.field input::placeholder,
.field textarea::placeholder { color: #9AA9BD; }
.field input:focus,
.field select:focus,
.field textarea:focus {
  background: var(--white);
  border-color: var(--brand-400);
  box-shadow: 0 0 0 3px rgba(26, 115, 255, .12);
}
.field.has-error input,
.field.has-error select { border-color: #E0574F; box-shadow: 0 0 0 3px rgba(224, 87, 79, .10); }

.contact-form .btn-block { margin-top: 24px; }
.form-tip { margin-top: 12px; font-size: 13px; min-height: 20px; color: var(--muted); }
.form-tip.is-ok { color: #0E8A5F; }
.form-tip.is-err { color: #C63A32; }

/* ---------- 页脚 ---------- */
.site-footer {
  background: var(--ink-900);
  color: rgba(255, 255, 255, .62);
  padding: 64px 0 26px;
}
.footer-top {
  display: grid;
  grid-template-columns: 1.35fr .72fr .72fr 1.4fr;
  gap: 42px;
  padding-bottom: 44px;
  border-bottom: 1px solid rgba(255, 255, 255, .08);
}
.footer-brand .brand-text strong { display: block; font-size: 18px; color: #fff; }
.footer-brand .brand-sub { color: rgba(255, 255, 255, .42); }
.footer-brand p { margin-top: 16px; font-size: 13.5px; line-height: 1.85; color: rgba(255, 255, 255, .48); max-width: 340px; }
.footer-links { display: grid; gap: 11px; align-content: start; }
.footer-links h4 { font-size: 13px; font-weight: 600; color: rgba(255, 255, 255, .9); letter-spacing: .04em; margin-bottom: 3px; }
.footer-links a { font-size: 13.5px; color: rgba(255, 255, 255, .52); transition: color .2s var(--ease); }
.footer-links a:hover { color: var(--cyan-400); }
.footer-contact { display: grid; gap: 9px; align-content: start; }
.footer-contact h4 { font-size: 13px; font-weight: 600; color: rgba(255, 255, 255, .9); letter-spacing: .04em; margin-bottom: 3px; }
.footer-contact p { font-size: 13px; color: rgba(255, 255, 255, .52); }
.footer-contact a:hover { color: var(--cyan-400); }

.footer-bottom {
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px;
  padding-top: 24px;
  font-size: 12.5px;
  color: rgba(255, 255, 255, .38);
}
.footer-meta { letter-spacing: .02em; }
.footer-meta a { color: inherit; text-decoration: none; transition: color .2s; }
.footer-meta a:hover { color: var(--brand-300, #6FA8FF); }

/* ---------- 回到顶部 ---------- */
.to-top {
  position: fixed; right: 26px; bottom: 26px;
  z-index: 80;
  width: 46px; height: 46px;
  display: grid; place-items: center;
  border-radius: 50%;
  color: #fff;
  background: linear-gradient(140deg, #0B54E8, #1A73FF);
  box-shadow: 0 12px 30px rgba(10, 84, 232, .38);
  opacity: 0; visibility: hidden;
  transform: translateY(12px);
  transition: opacity .3s var(--ease), transform .3s var(--ease), visibility .3s;
}
.to-top.is-show { opacity: 1; visibility: visible; transform: none; }
.to-top:hover { transform: translateY(-3px); }
.to-top .ico { width: 20px; height: 20px; }

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1180px) {
  .nav-external { display: none; }
  .brand-mark img { height: 46px; transform: translateY(5px); }
  .hero-inner { gap: 40px; }
  .adv-layout, .faq-layout { gap: 44px; }
  .footer-top { grid-template-columns: 1.4fr 1fr 1.2fr; }
  .footer-contact { grid-column: 1 / -1; }
}

@media (max-width: 1024px) {
  .hero { padding: 128px 0 66px; }
  .hero-inner { grid-template-columns: 1fr; gap: 48px; }
  .hero-sub { max-width: none; }
  .hero-visual { align-items: stretch; }
  .float-card { align-self: flex-start; }
  .stat-strip { margin-top: 56px; }
  .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .adv-layout, .faq-layout, .contact-layout { grid-template-columns: 1fr; }
  .adv-copy, .faq-head { position: static; }
  .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .step:nth-child(3n)::after { display: block; }
  .step:nth-child(2n)::after { display: none; }
  .section { padding: 76px 0; }
}

@media (max-width: 860px) {
  .nav-toggle { display: flex; }
  .nav {
    position: fixed;
    inset: 66px 16px auto 16px;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 14px;
    border-radius: var(--r-lg);
    background: rgba(255, 255, 255, .98);
    border: 1px solid var(--line);
    box-shadow: 0 24px 60px rgba(3, 8, 15, .28);
    opacity: 0; visibility: hidden;
    transform: translateY(-10px);
    transition: opacity .28s var(--ease), transform .28s var(--ease), visibility .28s;
  }
  .nav.is-open { opacity: 1; visibility: visible; transform: none; }
  .nav-link { color: var(--text-2); padding: 12px 14px; font-size: 15px; }
  .nav-link:hover { background: var(--paper-2); color: var(--text); }
  .nav-link.is-active { color: var(--brand-600); background: var(--paper); }
  .nav-link.is-active::after { display: none; }
  .nav-external { display: inline-flex; color: var(--muted); }
  .nav-cta { margin: 8px 0 0; justify-content: center; }
  .site-header.is-stuck .nav-toggle { color: var(--text); }

  .brand-mark img { height: 42px; transform: translateY(4px); }
  .site-header.is-stuck .brand-mark img { height: 40px; }
  .brand-text strong { font-size: 15.5px; }
}

@media (max-width: 720px) {
  .wrap { width: calc(100% - 32px); }
  .hero { padding: 112px 0 56px; }
  .hero h1 { font-size: clamp(30px, 8.4vw, 40px); }
  .hero-sub { font-size: 15px; }
  .hero-actions .btn { flex: 1 1 auto; justify-content: center; }
  .device-panel { padding: 18px; }
  .panel-foot { flex-direction: column; align-items: flex-start; gap: 6px; }
  .float-card { gap: 8px; padding: 7px 13px; margin-bottom: 12px; }
  .fc-note { display: none; }

  .stat-strip { grid-template-columns: 1fr; gap: 0; padding: 8px 22px; margin-top: 48px; }
  .stat { padding: 18px 0; }
  .stat + .stat { padding-left: 0; border-left: 0; border-top: 1px solid rgba(255, 255, 255, .1); }
  .stat-num { font-size: 28px; }

  .section { padding: 62px 0; }
  .sec-head { margin-bottom: 36px; }
  .grid-3, .adv-grid, .steps { grid-template-columns: 1fr; }
  .dev-card, .plan-card, .adv-item, .step { padding: 24px 22px; }
  .step::after { display: none !important; }
  .faq-q { padding: 17px 18px; font-size: 15px; }
  .faq-item.is-open .faq-a > p { padding: 0 18px 18px; }
  .faq-a > p { padding: 0 18px; }
  .contact-form { padding: 26px 22px; }
  .field-row { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr; gap: 32px; }
  .to-top { right: 16px; bottom: 16px; width: 42px; height: 42px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .pulse { animation: none; }
  * { transition-duration: .01ms !important; animation-duration: .01ms !important; }
}