:root {
  --ink: #eef7ff;
  --muted: #8da6b8;
  --bg: #061018;
  --panel: rgba(9, 24, 35, .78);
  --panel-strong: #0b1b27;
  --line: rgba(156, 212, 255, .18);
  --cyan: #24d5ff;
  --blue: #2f7bff;
  --green: #6df0b1;
  --amber: #ffca6a;
  --red: #ff6e84;
  --shadow: 0 24px 80px rgba(0, 0, 0, .36);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 15% 12%, rgba(36, 213, 255, .16), transparent 28rem),
    radial-gradient(circle at 85% 20%, rgba(109, 240, 177, .10), transparent 24rem),
    linear-gradient(180deg, #061018 0%, #07131c 48%, #091016 100%);
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans SC", sans-serif;
  letter-spacing: 0;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  opacity: .42;
  background-image:
    linear-gradient(rgba(255,255,255,.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.035) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: linear-gradient(to bottom, #000 0%, transparent 80%);
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
p { color: var(--muted); line-height: 1.85; }

.loader {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-items: center;
  gap: 16px;
  background: #061018;
  animation: loaderOut .9s ease 1.1s forwards;
}
.loader span {
  width: 54px;
  height: 54px;
  border: 1px solid var(--line);
  border-top-color: var(--cyan);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}
.loader b { color: var(--cyan); font-size: 13px; letter-spacing: 0; }
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes loaderOut { to { opacity: 0; visibility: hidden; } }

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px clamp(18px, 5vw, 72px);
  border-bottom: 1px solid transparent;
  transition: .25s ease;
}
.site-header.scrolled {
  background: rgba(5, 15, 24, .84);
  backdrop-filter: blur(18px);
  border-bottom-color: var(--line);
}
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; }
.brand img { width: 38px; height: 38px; border-radius: 8px; object-fit: cover; }
.brand span { font-size: 22px; }
.nav { display: flex; gap: 24px; color: #cfe1ee; font-size: 14px; }
.nav a { opacity: .88; }
.nav a:hover { color: var(--cyan); opacity: 1; }
.header-cta {
  padding: 10px 16px;
  border: 1px solid rgba(36, 213, 255, .35);
  border-radius: 8px;
  color: var(--cyan);
  background: rgba(36, 213, 255, .08);
}
.menu-btn { display: none; }

.hero {
  min-height: 92vh;
  padding: 132px clamp(18px, 5vw, 72px) 72px;
  display: flex;
  align-items: center;
}
.hero-grid {
  width: min(1180px, 100%);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: clamp(32px, 6vw, 86px);
  align-items: center;
}
.eyebrow {
  margin: 0 0 14px;
  color: var(--cyan);
  text-transform: uppercase;
  font-size: 12px;
  font-weight: 800;
}
h1, h2, h3 { margin: 0; letter-spacing: 0; }
h1 {
  max-width: 720px;
  font-size: clamp(46px, 7vw, 88px);
  line-height: .98;
}
.hero-sub {
  max-width: 680px;
  margin: 28px 0 0;
  font-size: 18px;
  color: #b8cddd;
}
.hero-actions { display: flex; gap: 14px; margin-top: 34px; flex-wrap: wrap; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 12px 20px;
  border-radius: 8px;
  font-weight: 800;
  border: 1px solid var(--line);
  cursor: pointer;
}
.btn.primary {
  color: #031018;
  border: 0;
  background: linear-gradient(135deg, var(--cyan), var(--green));
  box-shadow: 0 16px 40px rgba(36, 213, 255, .2);
}
.btn.ghost { color: var(--ink); background: rgba(255,255,255,.06); }
.proof-line {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 28px;
}
.proof-line span {
  padding: 8px 11px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: #cfe1ee;
  background: rgba(255,255,255,.04);
  font-size: 13px;
}

.hero-panel {
  position: relative;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: linear-gradient(145deg, rgba(10,31,45,.88), rgba(7,18,28,.66));
  box-shadow: var(--shadow);
  overflow: hidden;
}
.hero-panel::before {
  content: "";
  position: absolute;
  inset: -1px;
  background: linear-gradient(130deg, rgba(36,213,255,.2), transparent 38%, rgba(109,240,177,.16));
  pointer-events: none;
}
.radar-card, .dashboard-mock { position: relative; z-index: 1; }
.radar-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(3, 11, 18, .52);
}
.radar {
  width: 74px;
  height: 74px;
  border-radius: 50%;
  background:
    conic-gradient(from 0deg, transparent, rgba(36,213,255,.88), transparent 34%),
    radial-gradient(circle, rgba(36,213,255,.1) 0 28%, transparent 29% 100%);
  border: 1px solid rgba(36,213,255,.35);
  animation: spin 3.6s linear infinite;
}
.radar-card strong, .radar-card span { display: block; }
.radar-card span { color: var(--muted); font-size: 13px; margin-top: 4px; }
.dashboard-mock {
  margin-top: 16px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
.metric, .chart-bars, .alert-feed {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(4, 13, 20, .58);
  padding: 16px;
}
.metric span { display: block; color: var(--muted); font-size: 12px; }
.metric b { display: block; margin-top: 10px; font-size: 28px; }
.positive b { color: var(--green); }
.warning b { color: var(--amber); }
.chart-bars {
  grid-column: span 3;
  height: 150px;
  display: flex;
  align-items: end;
  gap: 12px;
}
.chart-bars i {
  flex: 1;
  border-radius: 6px 6px 0 0;
  background: linear-gradient(180deg, var(--cyan), rgba(47,123,255,.16));
  min-height: 28px;
  animation: grow 2.2s ease-in-out infinite alternate;
}
.chart-bars i:nth-child(1) { height: 44%; }
.chart-bars i:nth-child(2) { height: 68%; animation-delay: .2s; }
.chart-bars i:nth-child(3) { height: 52%; animation-delay: .4s; }
.chart-bars i:nth-child(4) { height: 88%; animation-delay: .6s; }
.chart-bars i:nth-child(5) { height: 72%; animation-delay: .8s; }
.chart-bars i:nth-child(6) { height: 96%; animation-delay: 1s; }
@keyframes grow { to { filter: brightness(1.35); transform: scaleY(.92); } }
.alert-feed { grid-column: span 3; }
.alert-feed p { margin: 0 0 10px; font-size: 14px; }
.alert-feed p:last-child { margin-bottom: 0; }
.alert-feed b { color: var(--cyan); }

.logo-wall {
  width: min(1180px, calc(100% - 36px));
  margin: 0 auto 52px;
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  background: rgba(255,255,255,.035);
}
.logo-wall span {
  text-align: center;
  padding: 18px 10px;
  color: #a9bece;
  border-right: 1px solid var(--line);
}
.logo-wall span:last-child { border-right: 0; }

.section {
  width: min(1180px, calc(100% - 36px));
  margin: 0 auto;
  padding: 72px 0;
  opacity: 1;
  transform: translateY(0);
  transition: .65s ease;
}
.section.visible, .reveal { opacity: 1; transform: translateY(0); }
.delay-1 { animation-delay: .12s; }
.section-head { max-width: 760px; margin-bottom: 30px; }
.section-head.inline {
  max-width: none;
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
}
.section h2 { font-size: clamp(30px, 4vw, 52px); line-height: 1.12; }
.section h3 { font-size: 22px; }

.pain-grid, .solution-grid, .price-grid, .article-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.pain-grid article, .solution-grid article, .price-grid article, .article-card, .faq-list details, .lead-form, .contact-copy {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  padding: 24px;
  box-shadow: 0 18px 50px rgba(0,0,0,.16);
}
.pain-grid span {
  color: var(--cyan);
  font-weight: 900;
  font-size: 13px;
}

.feature-switch {
  display: grid;
  grid-template-columns: .9fr 1.1fr;
  gap: 30px;
  align-items: stretch;
}
.tabs { display: grid; gap: 10px; margin-top: 28px; }
.tab {
  width: 100%;
  padding: 16px;
  color: var(--ink);
  text-align: left;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255,255,255,.04);
  cursor: pointer;
}
.tab.active {
  color: #031018;
  background: linear-gradient(135deg, var(--cyan), var(--green));
}
.switch-stage {
  min-height: 360px;
  border: 1px solid rgba(36,213,255,.28);
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(36,213,255,.12), transparent),
    var(--panel-strong);
  padding: 32px;
}
.tab-panel { display: none; }
.tab-panel.active { display: block; animation: fade .35s ease; }
@keyframes fade { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
.tab-panel h3 { font-size: 30px; }
.tab-panel ul { margin: 24px 0 0; padding: 0; display: grid; gap: 12px; }
.tab-panel li { list-style: none; padding: 14px; border: 1px solid var(--line); border-radius: 8px; color: #dcecf6; }

.solution-grid { grid-template-columns: repeat(3, 1fr); }
.price-grid article { display: flex; flex-direction: column; gap: 16px; }
.price-grid .featured {
  border-color: rgba(36,213,255,.6);
  background: linear-gradient(180deg, rgba(36,213,255,.16), rgba(9,24,35,.82));
}
.price-grid ul { padding-left: 18px; color: #bed2df; line-height: 1.9; }
.price-grid a { margin-top: auto; color: var(--cyan); font-weight: 800; }

.text-link { color: var(--cyan); font-weight: 800; }
.article-card {
  display: flex;
  flex-direction: column;
  min-height: 248px;
  transition: .25s ease;
}
.article-card:hover, .article-row:hover {
  transform: translateY(-4px);
  border-color: rgba(36,213,255,.48);
}
.article-card span, .article-row span, .article-detail header span {
  color: var(--green);
  font-size: 12px;
  font-weight: 900;
}
.article-card time { margin-top: auto; color: var(--muted); }

.faq-list { display: grid; gap: 12px; }
details summary { cursor: pointer; font-size: 18px; font-weight: 800; }
details p { margin-bottom: 0; }

.contact {
  display: grid;
  grid-template-columns: .85fr 1.15fr;
  gap: 18px;
  align-items: start;
}
.contact-methods { display: grid; gap: 12px; margin-top: 22px; color: #dbeaf4; }
.contact-methods img {
  width: 132px;
  border-radius: 8px;
  background: #fff;
  padding: 8px;
}
.lead-form { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.lead-form label { display: grid; gap: 8px; color: #c9dbea; font-size: 14px; }
.lead-form label:nth-child(5), .lead-form label:nth-child(6), .lead-form button, .form-status { grid-column: 1 / -1; }
input, select, textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 13px 14px;
  color: var(--ink);
  background: rgba(0,0,0,.22);
  outline: none;
  font: inherit;
}
textarea { resize: vertical; }
input:focus, select:focus, textarea:focus { border-color: var(--cyan); }
.form-status { margin: 0; min-height: 22px; color: var(--green); }
button[disabled] { opacity: .64; cursor: wait; }

.site-footer {
  width: min(1180px, calc(100% - 36px));
  margin: 36px auto 0;
  padding: 34px 0 46px;
  display: grid;
  grid-template-columns: 1.2fr .8fr .8fr;
  gap: 24px;
  border-top: 1px solid var(--line);
}
.footer-brand img { width: 32px; height: 32px; }
.footer-links, .footer-contact { display: grid; gap: 10px; color: var(--muted); }

.page-hero {
  width: min(1180px, calc(100% - 36px));
  margin: 0 auto;
  padding: 136px 0 48px;
}
.page-hero.small h1 { font-size: clamp(40px, 6vw, 68px); }
.article-list { display: grid; gap: 14px; padding-top: 24px; }
.article-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 20px;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 24px;
  background: var(--panel);
  transition: .25s ease;
}
.article-row h2 { font-size: 24px; margin-top: 8px; }
.article-row time { color: var(--muted); white-space: nowrap; }
.article-detail {
  width: min(900px, calc(100% - 36px));
  margin: 0 auto;
  padding: 136px 0 72px;
}
.article-detail header {
  border-bottom: 1px solid var(--line);
  padding-bottom: 26px;
  margin-bottom: 34px;
}
.article-detail h1 { font-size: clamp(36px, 5vw, 62px); line-height: 1.12; margin-top: 12px; }
.article-body {
  color: #d8e6ef;
  font-size: 17px;
  line-height: 1.95;
}
.article-body h2 { font-size: 30px; margin: 38px 0 12px; }
.article-body h3 { font-size: 22px; margin: 28px 0 10px; }
.article-body ul, .article-body ol { padding-left: 22px; color: #c5d9e6; line-height: 1.9; }
.article-body a { color: var(--cyan); }
.article-cta {
  margin-top: 46px;
  padding: 26px;
  border: 1px solid rgba(36,213,255,.4);
  border-radius: 8px;
  background: linear-gradient(135deg, rgba(36,213,255,.12), rgba(109,240,177,.08));
}

@media (max-width: 900px) {
  .menu-btn {
    display: grid;
    gap: 5px;
    width: 42px;
    height: 42px;
    padding: 10px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: rgba(255,255,255,.05);
  }
  .menu-btn span { height: 2px; background: var(--ink); }
  .header-cta { display: none; }
  .nav {
    position: absolute;
    top: 72px;
    left: 18px;
    right: 18px;
    display: none;
    padding: 18px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: rgba(6,16,24,.96);
    backdrop-filter: blur(16px);
  }
  .nav.open { display: grid; }
  .hero-grid, .feature-switch, .contact, .site-footer { grid-template-columns: 1fr; }
  .hero { padding-top: 118px; min-height: auto; }
  .dashboard-mock, .pain-grid, .solution-grid, .price-grid, .article-grid, .logo-wall { grid-template-columns: 1fr; }
  .logo-wall span { border-right: 0; border-bottom: 1px solid var(--line); }
  .metric, .chart-bars, .alert-feed { grid-column: auto; }
  .lead-form { grid-template-columns: 1fr; }
  .section-head.inline { display: block; }
  .article-row { grid-template-columns: 1fr; }
}

@media (max-width: 520px) {
  .site-header { padding: 14px 18px; }
  .brand span { font-size: 18px; }
  .hero-actions .btn { width: 100%; }
  .radar-card { align-items: flex-start; }
  .radar { width: 58px; height: 58px; flex: 0 0 58px; }
  .section { padding: 52px 0; }
  .pain-grid article, .solution-grid article, .price-grid article, .article-card, .lead-form, .contact-copy { padding: 20px; }
}