/* ============================================================
   登登集合网络科技 · 官网设计系统
   科技风 / 智能服务风格 —— 深色 + 霓虹青蓝紫
   ============================================================ */
:root {
  --bg:        #060a18;
  --bg-2:      #0a1024;
  --bg-3:      #0e1730;
  --card:      rgba(255, 255, 255, 0.04);
  --card-2:    rgba(255, 255, 255, 0.07);
  --line:      rgba(120, 170, 255, 0.14);
  --line-2:    rgba(120, 170, 255, 0.28);

  --brand-cyan:   #2ee6d6;
  --brand-blue:   #3b82f6;
  --brand-violet: #8b5cf6;
  --brand:        #38bdf8;

  --text:     #e8f0ff;
  --text-hi:  #ffffff;
  --text-mid: #aab8d8;
  --text-low: #6b7aa0;

  --grad: linear-gradient(120deg, #2ee6d6 0%, #38bdf8 45%, #818cf8 100%);
  --grad-warm: linear-gradient(120deg, #38bdf8, #8b5cf6);

  --radius: 16px;
  --radius-lg: 22px;
  --shadow-glow: 0 0 40px rgba(56, 189, 248, 0.18);
  --font: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; }

.container { width: min(1180px, 92%); margin: 0 auto; }
.grad {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

/* ---------- 背景装饰 ---------- */
.bg-fx { position: fixed; inset: 0; z-index: -2; pointer-events: none; }
.bg-fx::before {
  content: "";
  position: absolute; inset: 0;
  background:
    radial-gradient(900px 500px at 85% -5%, rgba(99, 102, 241, 0.22), transparent 60%),
    radial-gradient(800px 480px at 8% 12%, rgba(46, 230, 214, 0.12), transparent 60%),
    radial-gradient(700px 600px at 50% 110%, rgba(59, 130, 246, 0.15), transparent 60%);
}
.bg-fx::after {
  content: "";
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(120, 170, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(120, 170, 255, 0.05) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, #000 30%, transparent 75%);
}

/* ---------- 导航 ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  transition: all .3s ease;
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: rgba(6, 10, 24, 0.82);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom-color: var(--line);
}
.nav__inner { display: flex; align-items: center; gap: 28px; height: 72px; }
.brand { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.brand__logo {
  width: 42px; height: 42px; border-radius: 12px;
  display: grid; place-items: center;
  font-size: 22px; font-weight: 800; color: #04101f;
  background: var(--grad);
  box-shadow: 0 6px 20px rgba(56, 189, 248, 0.35);
}
.brand__name { font-size: 15.5px; font-weight: 700; color: var(--text-hi); line-height: 1.3; }
.brand__sub  { font-size: 10px; letter-spacing: 2px; color: var(--text-low); }
.nav__links { display: flex; gap: 6px; margin-left: auto; }
.nav__links a {
  padding: 8px 15px; border-radius: 10px;
  font-size: 14.5px; color: var(--text-mid);
  transition: all .2s;
  position: relative;
}
.nav__links a:hover { color: var(--text-hi); background: var(--card-2); }
.nav__links a.active { color: var(--text-hi); }
.nav__links a.active::after {
  content: ""; position: absolute; left: 15px; right: 15px; bottom: 2px;
  height: 2px; border-radius: 2px; background: var(--grad);
}
.nav__cta {
  flex-shrink: 0;
  padding: 9px 22px; border-radius: 999px;
  font-size: 14px; font-weight: 600; color: #04101f;
  background: var(--grad);
  box-shadow: 0 6px 22px rgba(56, 189, 248, 0.35);
  transition: transform .2s, box-shadow .2s;
}
.nav__cta:hover { transform: translateY(-2px); box-shadow: 0 10px 30px rgba(56, 189, 248, 0.5); }
.nav__toggle { display: none; background: none; border: 0; flex-direction: column; gap: 5px; margin-left: auto; }
.nav__toggle span { width: 24px; height: 2px; background: var(--text-hi); border-radius: 2px; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 26px; border-radius: 999px;
  font-size: 15px; font-weight: 600;
  border: 1px solid transparent;
  transition: all .22s ease;
  white-space: nowrap;
}
.btn--primary {
  color: #04101f;
  background: var(--grad);
  box-shadow: 0 8px 26px rgba(56, 189, 248, 0.32);
}
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 14px 36px rgba(56, 189, 248, 0.5); }
.btn--ghost {
  color: var(--text-hi);
  background: var(--card);
  border-color: var(--line-2);
  backdrop-filter: blur(6px);
}
.btn--ghost:hover { background: var(--card-2); border-color: var(--brand-cyan); transform: translateY(-2px); }
.btn--lg { padding: 15px 34px; font-size: 16px; }
.btn--sm { padding: 8px 18px; font-size: 13.5px; }

/* ---------- Hero ---------- */
.hero { position: relative; padding: 168px 0 90px; }
.hero__wrap { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 56px; align-items: center; }
.hero__badge {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 7px 16px; border-radius: 999px;
  border: 1px solid var(--line-2);
  background: var(--card);
  font-size: 13px; color: var(--text-mid);
  letter-spacing: .5px;
}
.hero__badge .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--brand-cyan);
  box-shadow: 0 0 0 0 rgba(46, 230, 214, .7);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(46, 230, 214, .6); }
  70% { box-shadow: 0 0 0 10px rgba(46, 230, 214, 0); }
  100% { box-shadow: 0 0 0 0 rgba(46, 230, 214, 0); }
}
.hero__title {
  margin: 22px 0 18px;
  font-size: clamp(34px, 4.6vw, 56px);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: 1px;
}
.hero__sub { font-size: 16.5px; color: var(--text-mid); max-width: 540px; }
.hero__actions { display: flex; gap: 16px; margin: 32px 0 22px; flex-wrap: wrap; }
.hero__note { display: flex; gap: 20px; flex-wrap: wrap; font-size: 13.5px; color: var(--text-low); }

/* hero 视觉 */
.hero__visual { position: relative; }
.orb { position: absolute; border-radius: 50%; filter: blur(46px); opacity: .55; z-index: 0; }
.orb--a { width: 240px; height: 240px; background: #2ee6d6; top: -50px; right: -40px; }
.orb--b { width: 260px; height: 260px; background: #6366f1; bottom: -60px; left: -50px; }
.orb--c { width: 160px; height: 160px; background: #3b82f6; top: 40%; left: 30%; opacity: .35; }
.shot {
  position: relative; z-index: 1;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line-2);
  overflow: hidden;
  background: var(--bg-3);
  box-shadow: var(--shadow-glow), 0 30px 80px rgba(0,0,0,.55);
  animation: float 6s ease-in-out infinite;
}
@keyframes float { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-14px); } }
.shot img { width: 100%; }
.shot__cap {
  padding: 12px 18px; font-size: 13px; color: var(--text-mid);
  background: rgba(8, 14, 34, .9);
  border-top: 1px solid var(--line);
  display: flex; align-items: center; gap: 8px;
}
.shot__cap::before { content: "●"; color: var(--brand-cyan); font-size: 9px; }

/* hero 指标条 */
.hero__metrics {
  margin-top: 64px;
  display: grid; grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--card);
  backdrop-filter: blur(8px);
  overflow: hidden;
}
.metric { padding: 26px 24px; border-right: 1px solid var(--line); text-align: center; }
.metric:last-child { border-right: 0; }
.metric__num { font-size: 30px; font-weight: 800; }
.metric__label { font-size: 13px; color: var(--text-low); margin-top: 4px; }

/* ---------- 通用区块 ---------- */
.section { padding: 96px 0; position: relative; }
.section--alt { background: linear-gradient(180deg, rgba(14, 23, 48, .55), rgba(6, 10, 24, 0)); }
.section__head { text-align: center; max-width: 720px; margin: 0 auto 58px; }
.eyebrow {
  display: inline-block;
  font-size: 12.5px; letter-spacing: 3px; text-transform: uppercase;
  color: var(--brand-cyan); font-weight: 700;
  padding: 5px 14px; border: 1px solid var(--line-2); border-radius: 999px;
  background: var(--card); margin-bottom: 18px;
}
.section__head h2 { font-size: clamp(27px, 3.4vw, 40px); font-weight: 800; line-height: 1.25; }
.section__head p { margin-top: 14px; color: var(--text-mid); font-size: 16px; }

/* 页面顶部小 hero（内页） */
.page-hero { padding: 150px 0 70px; text-align: center; position: relative; }
.page-hero h1 { font-size: clamp(32px, 4.4vw, 48px); font-weight: 800; }
.page-hero p { color: var(--text-mid); max-width: 640px; margin: 16px auto 0; font-size: 16.5px; }
.breadcrumb { margin-top: 20px; font-size: 13px; color: var(--text-low); }
.breadcrumb a:hover { color: var(--brand-cyan); }

/* ---------- 卡片网格 ---------- */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }

.card {
  position: relative;
  padding: 30px 28px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--card);
  backdrop-filter: blur(10px);
  transition: transform .28s ease, border-color .28s ease, box-shadow .28s ease;
  overflow: hidden;
}
.card::before {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(160deg, rgba(56, 189, 248, .10), transparent 45%);
  opacity: 0; transition: opacity .3s;
}
.card:hover { transform: translateY(-6px); border-color: var(--line-2); box-shadow: var(--shadow-glow); }
.card:hover::before { opacity: 1; }
.card__icon {
  width: 54px; height: 54px; border-radius: 14px;
  display: grid; place-items: center; font-size: 26px;
  background: linear-gradient(140deg, rgba(46,230,214,.18), rgba(139,92,246,.18));
  border: 1px solid var(--line-2);
  margin-bottom: 18px;
}
.card h3 { font-size: 18.5px; color: var(--text-hi); margin-bottom: 10px; position: relative; }
.card p { font-size: 14.5px; color: var(--text-mid); position: relative; }
.card ul { position: relative; }
.card ul li {
  font-size: 14.5px; color: var(--text-mid);
  padding: 7px 0 7px 24px; position: relative;
}
.card ul li::before {
  content: "▹"; position: absolute; left: 2px; color: var(--brand-cyan);
}

/* ---------- 首页：业务 ---------- */
.ops { margin-top: 60px; }

/* ---------- 首页：产品截图展示 ---------- */
.showcase { margin-top: 56px; }
.showcase__frame {
  position: relative;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line-2);
  background: var(--bg-3);
  overflow: hidden;
  box-shadow: 0 30px 90px rgba(0,0,0,.6), var(--shadow-glow);
  aspect-ratio: 16 / 9.2;
}
.showcase__img {
  position: absolute; inset: 0; width: 100%; height: 100%;
  object-fit: cover; object-position: top;
  opacity: 0; transition: opacity .5s ease;
}
.showcase__img.active { opacity: 1; }
.showcase__bar {
  position: absolute; left: 0; right: 0; bottom: 0;
  display: flex; align-items: center; gap: 14px;
  padding: 14px 18px;
  background: linear-gradient(0deg, rgba(6,10,24,.95), transparent);
}
.showcase__btn {
  width: 38px; height: 38px; border-radius: 50%;
  border: 1px solid var(--line-2); background: var(--card-2);
  color: var(--text-hi); font-size: 20px; line-height: 1;
  display: grid; place-items: center; transition: all .2s;
}
.showcase__btn:hover { background: var(--grad); color: #04101f; border-color: transparent; }
.showcase__dots { display: flex; gap: 8px; flex: 1; flex-wrap: wrap; }
.showcase__dot {
  width: 9px; height: 9px; border-radius: 50%;
  background: rgba(255,255,255,.22); cursor: pointer; transition: all .25s;
}
.showcase__dot.active { background: var(--brand-cyan); width: 26px; border-radius: 5px; }
.showcase__cap { font-size: 13.5px; color: var(--text-mid); }

/* ---------- 流程 ---------- */
.flow { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; counter-reset: step; }
.flow__item {
  position: relative; padding: 30px 24px;
  border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--card); text-align: center;
}
.flow__num {
  width: 46px; height: 46px; margin: 0 auto 16px;
  border-radius: 50%; display: grid; place-items: center;
  font-size: 19px; font-weight: 800; color: #04101f;
  background: var(--grad);
}
.flow__item h3 { font-size: 16.5px; color: var(--text-hi); margin-bottom: 8px; }
.flow__item p { font-size: 13.8px; color: var(--text-mid); }

/* ---------- CTA 横幅 ---------- */
.cta-band {
  position: relative;
  padding: 64px 48px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line-2);
  text-align: center;
  background:
    radial-gradient(600px 300px at 20% 0%, rgba(46,230,214,.16), transparent 60%),
    radial-gradient(600px 300px at 80% 100%, rgba(139,92,246,.20), transparent 60%),
    var(--bg-3);
  overflow: hidden;
}
.cta-band h2 { font-size: clamp(24px, 3vw, 34px); font-weight: 800; }
.cta-band p { color: var(--text-mid); margin: 14px auto 28px; max-width: 600px; }

/* ---------- 页脚 ---------- */
.footer {
  margin-top: 40px;
  border-top: 1px solid var(--line);
  background: rgba(8, 13, 30, .8);
  padding: 64px 0 0;
}
.footer__grid {
  display: grid; grid-template-columns: 1.6fr 1fr 1fr 1.2fr; gap: 40px;
  padding-bottom: 44px;
}
.footer h4 { font-size: 15px; color: var(--text-hi); margin-bottom: 16px; }
.footer li { margin-bottom: 10px; font-size: 14px; color: var(--text-mid); }
.footer li a:hover { color: var(--brand-cyan); }
.footer__about p { font-size: 14px; color: var(--text-mid); margin-top: 14px; max-width: 320px; }
.footer__bottom {
  border-top: 1px solid var(--line);
  padding: 20px 0;
  display: flex; justify-content: space-between; gap: 14px; flex-wrap: wrap;
  font-size: 13px; color: var(--text-low);
}
.footer__bottom a:hover { color: var(--brand-cyan); }

/* ---------- 内页：公司介绍 ---------- */
.about-split { display: grid; grid-template-columns: 1.1fr .9fr; gap: 48px; align-items: center; }
.about-split h3 { font-size: 24px; margin-bottom: 18px; color: var(--text-hi); }
.about-split p { color: var(--text-mid); margin-bottom: 16px; }
.about-card {
  padding: 30px; border-radius: var(--radius);
  border: 1px solid var(--line-2);
  background: linear-gradient(170deg, rgba(56,189,248,.08), rgba(139,92,246,.06));
}
.about-card .row { padding: 14px 0; border-bottom: 1px dashed var(--line); }
.about-card .row:last-child { border-bottom: 0; }
.about-card .row b { display: block; color: var(--text-hi); font-size: 15.5px; margin-bottom: 4px; }
.about-card .row span { font-size: 14px; color: var(--text-mid); }

.timeline { position: relative; max-width: 760px; margin: 0 auto; padding-left: 34px; }
.timeline::before {
  content: ""; position: absolute; left: 8px; top: 6px; bottom: 6px;
  width: 2px; background: linear-gradient(180deg, var(--brand-cyan), var(--brand-violet));
  border-radius: 2px;
}
.tl-item { position: relative; padding: 0 0 34px 18px; }
.tl-item::before {
  content: ""; position: absolute; left: -32px; top: 6px;
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--bg); border: 3px solid var(--brand-cyan);
  box-shadow: 0 0 14px rgba(46,230,214,.6);
}
.tl-item h4 { color: var(--text-hi); font-size: 17px; }
.tl-item .tl-time { font-size: 13px; color: var(--brand-cyan); font-weight: 700; letter-spacing: 1px; }
.tl-item p { color: var(--text-mid); font-size: 14.5px; margin-top: 4px; }

.values { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.value {
  text-align: center; padding: 30px 20px;
  border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--card); transition: all .25s;
}
.value:hover { border-color: var(--line-2); transform: translateY(-5px); }
.value .v-ic { font-size: 30px; margin-bottom: 12px; }
.value h4 { color: var(--text-hi); font-size: 16px; margin-bottom: 6px; }
.value p { font-size: 13.5px; color: var(--text-mid); }

/* ---------- 产品页 ---------- */
.module-row {
  display: grid; grid-template-columns: 1fr 1fr; gap: 44px; align-items: center;
  padding: 40px 0;
}
.module-row:nth-child(even) .module-row__shot { order: -1; }
.module-row__shot {
  border-radius: var(--radius); border: 1px solid var(--line-2);
  overflow: hidden; box-shadow: 0 20px 60px rgba(0,0,0,.5);
  background: var(--bg-3);
}
.module-row__shot img { width: 100%; }
.module-row__txt .m-tag {
  display: inline-block; font-size: 12.5px; font-weight: 700;
  color: var(--brand-cyan); letter-spacing: 1px; margin-bottom: 10px;
}
.module-row__txt h3 { font-size: 23px; color: var(--text-hi); margin-bottom: 12px; }
.module-row__txt p { color: var(--text-mid); margin-bottom: 14px; font-size: 15px; }
.module-row__txt li {
  padding: 6px 0 6px 26px; position: relative;
  color: var(--text-mid); font-size: 14.5px;
}
.module-row__txt li::before {
  content: "✓"; position: absolute; left: 0;
  color: var(--brand-cyan); font-weight: 700;
}
.module-divider { height: 1px; background: linear-gradient(90deg, transparent, var(--line-2), transparent); }

.platforms { display: flex; gap: 18px; justify-content: center; flex-wrap: wrap; }
.platform {
  display: flex; align-items: center; gap: 12px;
  padding: 16px 28px; border-radius: 14px;
  border: 1px solid var(--line); background: var(--card);
  font-size: 16px; font-weight: 600; color: var(--text-hi);
}
.platform .p-ic { font-size: 24px; }

/* ---------- 下载页 ---------- */
.dl-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.dl-card {
  padding: 36px 30px; text-align: center;
  border-radius: var(--radius-lg); border: 1px solid var(--line);
  background: var(--card); transition: all .28s;
}
.dl-card:hover { border-color: var(--line-2); transform: translateY(-6px); box-shadow: var(--shadow-glow); }
.dl-card__os { font-size: 44px; margin-bottom: 12px; }
.dl-card h3 { font-size: 19px; color: var(--text-hi); }
.dl-card .dl-meta { font-size: 13.5px; color: var(--text-low); margin: 8px 0 22px; }
.dl-steps { counter-reset: dstep; }
.dl-steps li {
  padding: 14px 0 14px 52px; position: relative;
  border-bottom: 1px dashed var(--line);
  color: var(--text-mid); font-size: 15px;
}
.dl-steps li:last-child { border-bottom: 0; }
.dl-steps li::before {
  counter-increment: dstep; content: counter(dstep);
  position: absolute; left: 0; top: 12px;
  width: 32px; height: 32px; border-radius: 10px;
  display: grid; place-items: center;
  font-weight: 800; font-size: 15px; color: #04101f;
  background: var(--grad);
}
.qr-box {
  width: 170px; height: 170px; margin: 0 auto 14px;
  border-radius: 16px; border: 1px solid var(--line-2);
  display: grid; place-items: center;
  background:
    linear-gradient(45deg, rgba(255,255,255,.06) 25%, transparent 25%, transparent 75%, rgba(255,255,255,.06) 75%),
    linear-gradient(45deg, rgba(255,255,255,.06) 25%, transparent 25%, transparent 75%, rgba(255,255,255,.06) 75%);
  background-size: 18px 18px; background-position: 0 0, 9px 9px;
  background-color: var(--bg-3);
  color: var(--text-low); font-size: 13px; text-align: center;
}

/* ---------- 技术页 ---------- */
.arch {
  border-radius: var(--radius-lg); border: 1px solid var(--line-2);
  background: var(--card); padding: 40px 32px;
}
.arch-layer { margin-bottom: 18px; }
.arch-layer:last-child { margin-bottom: 0; }
.arch-layer__label {
  font-size: 13px; font-weight: 700; color: var(--brand-cyan);
  letter-spacing: 2px; margin-bottom: 12px;
}
.arch-nodes { display: grid; gap: 14px; }
.arch-nodes.n4 { grid-template-columns: repeat(4, 1fr); }
.arch-nodes.n3 { grid-template-columns: repeat(3, 1fr); }
.arch-nodes.n2 { grid-template-columns: repeat(2, 1fr); }
.arch-node {
  padding: 18px 16px; text-align: center;
  border-radius: 12px; border: 1px solid var(--line);
  background: rgba(10, 16, 36, .8);
  font-size: 14px; color: var(--text-mid);
  transition: all .25s;
}
.arch-node b { display: block; color: var(--text-hi); font-size: 15px; margin-bottom: 4px; }
.arch-node:hover { border-color: var(--brand-cyan); box-shadow: 0 0 20px rgba(46,230,214,.18); transform: translateY(-3px); }
.arch-arrow { text-align: center; color: var(--text-low); font-size: 18px; margin: 4px 0; }

.tech-spec { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.spec {
  padding: 26px; border-radius: var(--radius);
  border: 1px solid var(--line); background: var(--card);
}
.spec .s-num { font-size: 30px; font-weight: 800; }
.spec h4 { font-size: 16px; color: var(--text-hi); margin: 8px 0 6px; }
.spec p { font-size: 13.8px; color: var(--text-mid); }

/* ---------- 登录页 ---------- */
.login-wrap {
  max-width: 460px; margin: 0 auto;
  padding: 40px 36px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line-2);
  background: var(--card);
  backdrop-filter: blur(14px);
  box-shadow: 0 30px 80px rgba(0,0,0,.5), var(--shadow-glow);
}
.login-wrap h3 { font-size: 24px; color: var(--text-hi); text-align: center; }
.login-wrap .l-sub { text-align: center; color: var(--text-low); font-size: 14px; margin: 6px 0 28px; }
.field { margin-bottom: 18px; }
.field label { display: block; font-size: 13.5px; color: var(--text-mid); margin-bottom: 8px; }
.field input {
  width: 100%; padding: 13px 16px;
  border-radius: 12px; border: 1px solid var(--line-2);
  background: rgba(6, 10, 24, .7);
  color: var(--text-hi); font-size: 15px; font-family: inherit;
  transition: border-color .2s, box-shadow .2s;
}
.field input:focus {
  outline: none; border-color: var(--brand-cyan);
  box-shadow: 0 0 0 3px rgba(46, 230, 214, .15);
}
.login-row { display: flex; justify-content: space-between; align-items: center; font-size: 13.5px; color: var(--text-mid); margin-bottom: 22px; }
.login-row a { color: var(--brand-cyan); }
.login-btn { width: 100%; padding: 14px; font-size: 16px; }
.wip {
  margin-top: 22px; padding: 14px 16px;
  border-radius: 12px; border: 1px dashed var(--line-2);
  background: rgba(139, 92, 246, .08);
  font-size: 13.5px; color: var(--text-mid); text-align: center;
}
.login-footer { text-align: center; margin-top: 18px; font-size: 13.5px; color: var(--text-low); }

/* ---------- 滚动显现动画 ---------- */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 960px) {
  .hero__wrap { grid-template-columns: 1fr; gap: 44px; }
  .hero__visual { max-width: 560px; margin: 0 auto; width: 100%; }
  .hero__metrics { grid-template-columns: repeat(2, 1fr); }
  .metric:nth-child(2) { border-right: 0; }
  .metric:nth-child(1), .metric:nth-child(2) { border-bottom: 1px solid var(--line); }
  .grid-3, .dl-grid, .tech-spec { grid-template-columns: 1fr 1fr; }
  .grid-4, .flow, .values { grid-template-columns: repeat(2, 1fr); }
  .footer__grid { grid-template-columns: 1fr 1fr; }
  .about-split { grid-template-columns: 1fr; }
  .module-row { grid-template-columns: 1fr; gap: 26px; }
  .module-row:nth-child(even) .module-row__shot { order: 0; }
  .arch-nodes.n4, .arch-nodes.n3 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .nav__links {
    position: fixed; top: 72px; left: 0; right: 0;
    flex-direction: column; gap: 4px;
    background: rgba(6, 10, 24, .97);
    border-bottom: 1px solid var(--line);
    padding: 16px 6%;
    display: none;
  }
  .nav__links.open { display: flex; }
  .nav__cta { display: none; }
  .nav__toggle { display: flex; }
  .grid-3, .grid-2, .grid-4, .dl-grid, .tech-spec, .flow, .values, .footer__grid {
    grid-template-columns: 1fr;
  }
  .hero { padding: 130px 0 60px; }
  .section { padding: 70px 0; }
  .cta-band { padding: 44px 24px; }
  .arch-nodes.n4, .arch-nodes.n3, .arch-nodes.n2 { grid-template-columns: 1fr; }
  .footer__bottom { flex-direction: column; text-align: center; }
}