/* ============================================================
   sections.css — 各板块布局（白底 + 鲜艳渐变设计语言）
   ============================================================ */

/* ==================== 固定导航 ==================== */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  transition: background-color .3s var(--ease), box-shadow .3s var(--ease);
}
.nav.is-scrolled {
  background: rgba(255,255,255,.92);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  box-shadow: 0 1px 0 #e8ebf5, 0 8px 30px rgba(20,26,60,.06);
}
.nav__inner {
  display: flex;
  align-items: center;
  gap: 24px;
  height: var(--nav-h);
}
.nav__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  position: relative;
  z-index: 2;
  flex-shrink: 0;
}
.logo-mark { flex-shrink: 0; }
.logo-mark { width: 46px; height: 46px; }
.nav__name {
  font-weight: 700;
  color: #fff;
  letter-spacing: .06em;
  font-size: 1.05rem;
  white-space: nowrap;
  transition: color .3s var(--ease);
}
.nav.is-scrolled .nav__name { color: var(--text-0); }

.nav__links {
  display: flex;
  gap: 2px;
  margin-left: auto;
}
.nav__link {
  position: relative;
  padding: 8px 10px;
  font-size: var(--fs-sm);
  font-weight: 500;
  color: rgba(255,255,255,.85);
  white-space: nowrap;
  transition: color .25s var(--ease);
}
.nav.is-scrolled .nav__link { color: var(--text-1); }
.nav__link::after {
  content: "";
  position: absolute;
  left: 10px; right: 10px; bottom: 2px;
  height: 2px;
  background: var(--grad);
  border-radius: 1px;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .25s var(--ease);
}
.nav__link:hover, .nav__link.is-active { color: #fff; }
.nav.is-scrolled .nav__link:hover, .nav.is-scrolled .nav__link.is-active { color: var(--text-0); }
.nav__link:hover::after, .nav__link.is-active::after { transform: scaleX(1); }

.nav__cta { padding: 10px 22px; flex-shrink: 0; }

.nav__burger {
  display: none;
  width: 42px; height: 42px;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  position: relative;
  z-index: 2;
}
.nav__burger span {
  display: block;
  width: 22px; height: 2px;
  background: #fff;
  border-radius: 1px;
  transition: transform .3s var(--ease), opacity .3s var(--ease), background-color .3s var(--ease);
}
.nav.is-scrolled .nav__burger span,
body.menu-open .nav__burger span { background: var(--text-0); }
body.menu-open .nav__burger span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
body.menu-open .nav__burger span:nth-child(2) { opacity: 0; }
body.menu-open .nav__burger span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.nav-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 98;
  background: rgba(255,255,255,.97);
}
body.menu-open .nav-overlay { display: block; }

.nav__progress {
  position: absolute;
  left: 0; bottom: -2px;
  height: 2px;
  width: 0;
  background: var(--grad);
}

@media (max-width: 1239px) {
  .nav__burger { display: flex; margin-left: 0; }
  .nav__cta { margin-left: auto; }
  .nav__links {
    position: fixed;
    inset: 0;
    z-index: 101;
    margin: 0;
    padding-top: calc(var(--nav-h) + 36px);
    flex-direction: column;
    align-items: center;
    gap: 6px;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity .3s var(--ease), visibility .3s;
  }
  body.menu-open .nav__links { opacity: 1; visibility: visible; pointer-events: none; }
  body.menu-open .nav__link { pointer-events: auto; }
  .nav__link, .nav.is-scrolled .nav__link { font-size: 1.2rem; padding: 13px 24px; color: var(--text-0); }
  body.menu-open .nav__name { color: var(--text-0); }
}
@media (max-width: 639px) {
  .nav__cta { display: none; }
  .nav__burger { margin-left: auto; }
}

/* ==================== Hero（渐变主视觉） ==================== */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: #04081f;
  /* 垂直节奏随视口高度伸缩：矮屏（笔记本/系统缩放）不再拥挤 */
  padding-block: calc(var(--nav-h) + clamp(20px, 4vh, 44px)) clamp(28px, 6vh, 64px);
}
.hero__art {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.hero__art::before {
  content: "";
  position: absolute;
  inset: -22%;
  background:
    radial-gradient(42% 54% at 15% 24%, rgba(0,196,255,.34), transparent 62%),
    radial-gradient(42% 54% at 85% 24%, rgba(104,61,255,.46), transparent 62%),
    radial-gradient(50% 52% at 50% 88%, rgba(43,77,255,.48), transparent 64%),
    linear-gradient(180deg, #060c33 0%, #0a1657 48%, #03081f 100%);
  filter: saturate(1.18);
}
/* 中央光晕（衬托标题，左右对称） */
.hero__art::after {
  content: "";
  position: absolute;
  width: 820px; height: 820px;
  left: 50%; top: 46%;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  background: radial-gradient(closest-side, rgba(0,184,255,.26), transparent 70%);
  filter: blur(42px);
}
/* 巨幅渐变光环（居中环抱文案，左右对称，慢速旋转） */
@keyframes ring-spin { to { transform: translate(-50%,-50%) rotate(360deg); } }
.hero__ring {
  position: absolute;
  width: 1320px; height: 1320px;
  left: 50%; top: 52%;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  background: conic-gradient(from 0deg,
    transparent 0deg,
    rgba(0,224,255,0) 36deg,
    rgba(0,224,255,.85) 95deg,
    rgba(72,92,255,.9) 150deg,
    rgba(124,72,255,.55) 180deg,
    rgba(72,92,255,.9) 210deg,
    rgba(0,224,255,.85) 265deg,
    rgba(0,224,255,0) 324deg,
    transparent 360deg);
  -webkit-mask: radial-gradient(closest-side, transparent 55%, #000 58%, #000 74%, transparent 77%);
  mask: radial-gradient(closest-side, transparent 55%, #000 58%, #000 74%, transparent 77%);
  filter: blur(.5px);
  animation: ring-spin 36s linear infinite;
}
.hero__gridlines {
  position: absolute;
  inset: 0;
  opacity: .55;
  background-image:
    linear-gradient(rgba(157,180,255,.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(157,180,255,.07) 1px, transparent 1px);
  background-size: 54px 54px;
  -webkit-mask-image: radial-gradient(ellipse 70% 62% at 50% 50%, #000 22%, transparent 74%);
  mask-image: radial-gradient(ellipse 70% 62% at 50% 50%, #000 22%, transparent 74%);
}
.hero__canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  opacity: .55;
}
.hero__inner { position: relative; z-index: 2; text-align: center; }
.hero__tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 18px 7px 12px;
  border-radius: var(--r-full);
  border: 1px solid rgba(0,212,255,.35);
  background: rgba(0,212,255,.08);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  color: rgba(180,240,255,.92);
  font-size: .7rem;
  font-weight: 600;
  letter-spacing: .22em;
  margin-bottom: clamp(16px, 3.4vh, 34px);
}
.hero__tag::before {
  content: '';
  width: 6px; height: 6px;
  border-radius: 50%;
  background: #00d4ff;
  box-shadow: 0 0 8px #00d4ff;
  animation: pulse-dot 2s ease infinite;
}
@keyframes pulse-dot {
  0%,100% { box-shadow: 0 0 6px rgba(0,212,255,.9); }
  50%      { box-shadow: 0 0 14px rgba(0,212,255,1), 0 0 24px rgba(0,212,255,.4); }
}
.hero__title {
  font-size: clamp(2.4rem, min(6.6vw, 9.6vh), 5.6rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -.01em;
  color: #fff;
  margin-bottom: clamp(14px, 3vh, 30px);
  text-shadow: 0 4px 40px rgba(5,12,50,.45);
}
@keyframes hl-shift {
  0%,100% { background-position: 0% 50%; }
  50%      { background-position: 100% 50%; }
}
.hero__hl {
  background: linear-gradient(92deg, #d0f4ff 0%, #00d4ff 40%, #a4ecff 70%, #48bfff 100%);
  background-size: 200% auto;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: hl-shift 5s ease infinite;
}
.hero__sub {
  color: rgba(235,240,255,.85);
  max-width: 640px;
  margin-inline: auto;
  font-size: clamp(.95rem, 1.3vw, 1.125rem);
  margin-bottom: clamp(8px, 1.6vh, 16px);
}
.hero__points {
  color: rgba(196,215,255,.7);
  font-size: var(--fs-sm);
  letter-spacing: .08em;
  margin-bottom: clamp(24px, 5vh, 50px);
}
.hero__cta { display: flex; gap: 16px; flex-wrap: wrap; justify-content: center; }

@media (max-width: 767px) {
  .br-md { display: none; }
  .hero__ring { width: 720px; height: 720px; }
}
@media (max-width: 479px) {
  .hero__tag { font-size: .64rem; letter-spacing: .12em; padding: 7px 14px; }
}

/* ==================== 服务快捷入口渐变带 ==================== */
.svc-band {
  position: relative;
  z-index: 5;
  margin-top: clamp(44px, 7vh, 76px);
}
.svc-band__inner {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 6px;
  padding: 22px 18px;
  border-radius: 22px;
  background: linear-gradient(40deg, #1e3bff 0%, #0077ff 48%, #00c6ff 100%);
  box-shadow: 0 28px 64px rgba(23,42,150,.38);
}
.svc-band__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 16px 8px 14px;
  border-radius: 14px;
  text-align: center;
  transition: background-color .25s var(--ease), transform .25s var(--ease);
}
.svc-band__item .icon { width: 31px; height: 31px; color: #fff; }
.svc-band__cn { color: #fff; font-size: .95rem; font-weight: 600; }
.svc-band__en {
  color: rgba(255,255,255,.62);
  font-family: var(--font-num);
  font-size: .66rem;
  letter-spacing: .14em;
  text-transform: uppercase;
}
@media (hover: hover) {
  .svc-band__item:hover { background: rgba(255,255,255,.15); transform: translateY(-3px); }
}
@media (max-width: 1023px) {
  .svc-band__inner { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 639px) {
  .svc-band__inner { grid-template-columns: repeat(2, 1fr); padding: 14px 12px; }
}

/* ==================== 01 公司定位 ==================== */
.about { background: var(--bg-0); }
.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(32px, 5vw, 72px);
  align-items: center;
}
.about__copy p { margin-bottom: 16px; color: var(--text-1); line-height: 1.85; }
.about__quote {
  position: relative;
  margin-top: clamp(28px, 4vw, 44px);
  padding: 22px 28px;
  background: #f3f6ff;
  border-radius: 0 var(--r-md) var(--r-md) 0;
  font-size: var(--fs-h4);
  color: var(--text-0);
  font-weight: 500;
  line-height: 1.7;
}
.about__quote::before {
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  border-radius: 2px;
  background: var(--grad);
}
.about__quote em { font-style: normal; color: var(--blue); }

.about__tech-label {
  margin-top: 28px;
  margin-bottom: 12px;
  font-family: var(--font-num);
  font-size: .75rem;
  font-weight: 600;
  letter-spacing: .28em;
  text-transform: uppercase;
  color: var(--blue);
}

.brain-svg { width: 100%; height: auto; }
.brain-flow {
  fill: none;
  stroke: rgba(43,77,255,.3);
  stroke-width: 1.4;
  stroke-dasharray: 5 7;
  animation: dashmove 1.8s linear infinite;
}
.brain-flow--out { stroke: rgba(0,184,255,.5); }
.brain-ring {
  fill: none;
  stroke: rgba(43,77,255,.22);
  stroke-width: 1;
  stroke-dasharray: 4 9;
  animation: dashmove 3s linear infinite;
}
.brain-hex {
  fill: url(#g-brain);
  fill-opacity: .92;
  stroke: url(#g-brain);
  stroke-width: 1.6;
  filter: drop-shadow(0 12px 26px rgba(43,77,255,.35));
}
.brain-core-text { fill: rgba(255,255,255,.92); font-size: 19px; font-weight: 700; letter-spacing: 3px; }
.brain-core-text--big { font-size: 23px; fill: #fff; }
.brain-node rect { fill: #f5f8ff; stroke: rgba(43,77,255,.22); }
.brain-node text { fill: #2c3a77; font-size: 14px; }
.brain-node--out rect { fill: #fff; stroke: rgba(43,77,255,.4); }
.brain-node--out text { fill: var(--text-0); font-weight: 600; }

.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: clamp(52px, 7vw, 88px);
  padding: clamp(36px, 5vw, 56px) 24px;
  background: #fff;
  border: 1px solid rgba(43,77,255,.12);
  border-radius: 24px;
  box-shadow:
    0 24px 64px rgba(43,77,255,.1),
    0 2px 0 0 rgba(43,77,255,.08) inset,
    0 -2px 0 0 rgba(0,184,255,.06) inset;
  position: relative;
}
.stats::before {
  content: '';
  position: absolute;
  top: 0; left: 10%; right: 10%;
  height: 2px;
  background: var(--grad);
  border-radius: 0 0 2px 2px;
}
.stat { text-align: center; }
.stat__num {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(2.6rem, 5vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.stat__label {
  display: block;
  margin-top: 8px;
  color: var(--text-2);
  font-size: var(--fs-sm);
}
.stat::after {
  content: "";
  display: block;
  width: 26px; height: 4px;
  margin: 12px auto 0;
  border-radius: 2px;
  background: var(--grad);
}
@media (max-width: 1023px) {
  .about__grid { grid-template-columns: 1fr; }
  .about__figure { max-width: 560px; margin-inline: auto; }
}
@media (max-width: 767px) {
  .stats { grid-template-columns: 1fr 1fr; row-gap: 32px; }
}

/* ==================== 02 解决什么问题 ==================== */
.pain__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--gap);
}
.pain-card {
  padding: 34px 30px;
  overflow: hidden;
}
.pain-card__no {
  position: absolute;
  top: 2px; right: 20px;
  font-family: var(--font-num);
  font-size: 86px;
  font-weight: 700;
  line-height: 1;
  color: rgba(20,26,60,.05);
  transition: color .3s var(--ease);
  pointer-events: none;
}
@media (hover: hover) {
  .pain-card:hover .pain-card__no { color: rgba(43,77,255,.14); }
}
.pain-card__icon {
  width: 46px; height: 46px;
  padding: 11px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(43,77,255,.1), rgba(0,184,255,.12));
  color: var(--blue);
  margin-bottom: 18px;
}
.pain-card h3 { font-size: var(--fs-h4); margin-bottom: 10px; }
.pain-card p { font-size: var(--fs-sm); color: var(--text-2); }

.pain-card--cta {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  border: 1px solid transparent;
  background:
    linear-gradient(135deg, rgba(43,77,255,.07), rgba(0,184,255,.05)) padding-box,
    linear-gradient(#fff, #fff) padding-box,
    var(--grad) border-box;
  transition: transform .32s var(--ease), box-shadow .32s var(--ease);
}
@media (hover: hover) {
  .pain-card--cta:hover {
    transform: translateY(-6px);
    box-shadow: 0 20px 56px rgba(43,77,255,.2), 0 0 0 1px rgba(43,77,255,.15);
  }
}
.pain-card--cta p { color: var(--text-1); }
.pain-card__lead { font-size: 1.2rem; color: var(--text-0); font-weight: 700; }
.pain-card__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 10px;
  color: var(--blue);
  font-size: var(--fs-sm);
  font-weight: 600;
}
.pain-card__link .icon { width: 18px; height: 18px; transition: transform .25s var(--ease); }
@media (hover: hover) {
  .pain-card--cta:hover .pain-card__link .icon { transform: translateX(6px); }
}
@media (max-width: 1023px) {
  .pain__grid { grid-template-columns: 1fr 1fr; }
  .pain-card--cta { grid-column: 1 / -1; }
}
@media (max-width: 639px) {
  .pain__grid { grid-template-columns: 1fr; }
}

/* ==================== 03 四层架构 ==================== */
/* 深色总览面板（参照站「技术价值观」色块） */
.arch-panel {
  position: relative;
  border-radius: 28px;
  padding: clamp(32px, 5vw, 60px);
  margin-bottom: clamp(48px, 7vw, 80px);
  overflow: hidden;
  background:
    radial-gradient(50% 70% at 28% 30%, rgba(43,77,255,.3), transparent 62%),
    radial-gradient(58% 76% at 88% 6%, rgba(0,184,255,.3), transparent 62%),
    radial-gradient(48% 66% at 6% 94%, rgba(104,61,255,.32), transparent 62%),
    linear-gradient(135deg, #0b1346 0%, #11206e 100%);
  box-shadow: 0 30px 70px rgba(15,26,90,.3);
}
.arch-overview {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(32px, 5vw, 64px);
  align-items: center;
}
.arch-stack { width: 100%; height: auto; }
.arch-beam { opacity: 1; }
.arch-plate path {
  fill: var(--pc);
  fill-opacity: .18;
  transition: fill-opacity .3s var(--ease), filter .3s var(--ease);
}
.arch-plate line { stroke: var(--pc); stroke-width: 1; opacity: .7; }
.arch-plate__tier { fill: rgba(160,195,255,.85); font-size: 12px; letter-spacing: 2px; }
.arch-plate__name { fill: #fff; font-size: 14px; font-weight: 600; }
@media (hover: hover) {
  .arch-plate:hover path { fill-opacity: .38; filter: drop-shadow(0 0 16px var(--pc)); }
}
.arch-overview__copy h3 { font-size: var(--fs-h3); margin-bottom: 14px; color: #fff; }
.arch-overview__copy > p { color: rgba(210,225,255,.88); line-height: 1.85; }
.arch-quicklist { margin-top: 22px; display: grid; gap: 14px; }
.arch-quicklist li { display: flex; gap: 14px; align-items: baseline; color: rgba(210,225,255,.85); font-size: var(--fs-sm); line-height: 1.6; }
.arch-quicklist span {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 15px;
  color: #6ee4ff;
  min-width: 32px;
  flex-shrink: 0;
}

.arch-subnav {
  position: sticky;
  top: var(--nav-h);
  z-index: 50;
  background: rgba(255,255,255,.92);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-block: 1px solid var(--border);
  margin-bottom: clamp(40px, 6vw, 64px);
}
.arch-subnav__inner {
  display: flex;
  gap: 10px;
  justify-content: center;
  padding-block: 10px;
  overflow-x: auto;
}
.arch-subnav a {
  padding: 8px 18px;
  border-radius: var(--r-full);
  font-size: var(--fs-sm);
  color: var(--text-2);
  white-space: nowrap;
  border: 1px solid transparent;
  transition: color .25s var(--ease), background-color .25s var(--ease), border-color .25s var(--ease);
}
.arch-subnav a:hover { color: var(--text-0); }
.arch-subnav a.is-active {
  color: var(--blue);
  background: #eef2ff;
  border-color: rgba(43,77,255,.3);
}
@media (max-width: 767px) {
  .arch-subnav { display: none; }
}

.arch-layers { position: relative; }
.arch-layers::before {
  content: "";
  position: absolute;
  top: 10px; bottom: 10px;
  left: calc(var(--gutter) + 7px);
  width: 2px;
  border-radius: 1px;
  background: linear-gradient(180deg, transparent, rgba(43,77,255,.4) 6%, rgba(0,184,255,.4) 94%, transparent);
}
.arch-layer {
  position: relative;
  padding-left: 44px;
  margin-bottom: clamp(64px, 9vw, 110px);
  scroll-margin-top: calc(var(--nav-h) + 64px);
}
/* 超大渐变水印编号（滚动锚点） */
.arch-layer::after {
  content: attr(data-no);
  position: absolute;
  right: 0; top: -28px;
  font-family: var(--font-num);
  font-size: clamp(110px, 13vw, 180px);
  font-weight: 800;
  line-height: 1;
  background: linear-gradient(180deg, rgba(43,77,255,.08), rgba(0,184,255,.02));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  pointer-events: none;
}
.arch-layer:last-child { margin-bottom: 0; }
.arch-layer::before {
  content: "";
  position: absolute;
  left: 0; top: 18px;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: #fff;
  border: 2px solid var(--blue);
  box-shadow: 0 0 0 5px rgba(43,77,255,.12);
}
.arch-layer__head {
  display: flex;
  gap: 26px;
  align-items: flex-start;
  margin-bottom: 38px;
}
.arch-layer__no {
  font-family: var(--font-num);
  font-size: clamp(56px, 8vw, 92px);
  font-weight: 700;
  line-height: .95;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  flex: none;
}
.arch-layer__title { font-size: var(--fs-h3); margin-bottom: 8px; }
.arch-layer__tagline { color: var(--text-2); max-width: 780px; }
.arch-layer__note {
  margin-top: 28px;
  padding: 16px 22px;
  border-radius: var(--r-md);
  background: var(--bg-1);
  border: 1px dashed #d8def0;
  color: var(--text-1);
  font-size: var(--fs-sm);
}
@media (max-width: 1023px) {
  .arch-overview { grid-template-columns: 1fr; }
  .arch-overview__figure { max-width: 540px; margin-inline: auto; }
}
@media (max-width: 767px) {
  .arch-layers::before { display: none; }
  .arch-layer { padding-left: 0; }
  .arch-layer::before { display: none; }
  .arch-layer__head { flex-direction: column; gap: 10px; }
}

/* ----- L1：8 系统小卡 ----- */
.l1-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.l1-card { padding: 22px 20px; }
.l1-card .icon {
  width: 38px; height: 38px;
  padding: 9px;
  border-radius: 10px;
  background: rgba(43,77,255,.08);
  color: var(--blue);
  margin-bottom: 12px;
}
.l1-card h4 { font-size: .95rem; font-weight: 600; margin-bottom: 4px; }
.l1-card p { font-size: var(--fs-xs); color: var(--text-2); }
@media (max-width: 1023px) {
  .l1-grid { grid-template-columns: 1fr 1fr; }
}

/* ----- L2：tabs ----- */
.tabs {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: var(--gap);
  align-items: start;
}
.tabs__list { display: flex; flex-direction: column; gap: 6px; }
.tabs__tab {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 14px 18px;
  border-radius: var(--r-md);
  border-left: 3px solid transparent;
  text-align: left;
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--text-1);
  transition: color .25s var(--ease), background-color .25s var(--ease), border-color .25s var(--ease), box-shadow .25s var(--ease);
}
.tabs__tab .icon { width: 20px; height: 20px; }
.tabs__tab:hover { color: var(--text-0); background: #f3f5fc; }
.tabs__tab.is-active {
  color: var(--blue);
  background: linear-gradient(40deg, rgba(43,77,255,.1), rgba(0,184,255,.07));
  border-left-color: var(--blue);
}
.tabs__panel {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-soft);
  padding: 34px;
  min-height: 420px;
}
.tabs__panel.is-active { animation: panelIn .35s var(--ease); }
@keyframes panelIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: none; }
}
.tabs__panel h4 { font-size: var(--fs-h4); margin-bottom: 12px; }
.tabs__panel > p { color: var(--text-1); margin-bottom: 20px; }
.tabs__label {
  font-family: var(--font-num);
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .26em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 12px;
}
@media (max-width: 1199px) {
  .tabs { grid-template-columns: 260px 1fr; }
}
@media (max-width: 767px) {
  .tabs { grid-template-columns: 1fr; }
  .tabs__list {
    flex-direction: row;
    overflow-x: auto;
    padding-bottom: 10px;
    scroll-snap-type: x proximity;
  }
  .tabs__tab {
    flex: none;
    width: auto;
    border-left: none;
    border: 1px solid transparent;
    border-radius: var(--r-full);
    padding: 10px 16px;
    scroll-snap-align: start;
  }
  .tabs__tab.is-active {
    background: #eef2ff;
    border-color: rgba(43,77,255,.35);
  }
  .tabs__panel { min-height: 0; padding: 24px 20px; }
}

/* ----- L3：9 方向清单瓦片 ----- */
.l3-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px 24px;
}
.l3-item {
  position: relative;
  padding: 16px 18px 16px 26px;
  border-radius: var(--r-sm);
  transition: background-color .25s var(--ease);
}
.l3-item::before {
  content: "";
  position: absolute;
  left: 0; top: 16px; bottom: 16px;
  width: 3px;
  border-radius: 2px;
  background: var(--grad);
}
.l3-item__no {
  display: block;
  font-family: var(--font-num);
  font-size: var(--fs-xs);
  font-weight: 700;
  color: var(--blue);
  margin-bottom: 4px;
}
.l3-item h4 {
  font-size: .95rem;
  font-weight: 600;
  color: var(--text-1);
  transition: color .25s var(--ease);
}
@media (hover: hover) {
  .l3-item:hover { background: #f5f7fd; }
  .l3-item:hover h4 { color: var(--text-0); }
}
@media (max-width: 1023px) {
  .l3-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 639px) {
  .l3-grid { grid-template-columns: 1fr; }
}

/* ----- L4：放射图 + 成效清单 ----- */
.l4-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(32px, 5vw, 56px);
  align-items: center;
}
.hub-svg { width: 100%; height: auto; }
.hub-line {
  fill: none;
  stroke: rgba(43,77,255,.3);
  stroke-width: 1.2;
  stroke-dasharray: 4 7;
  animation: dashmove 2.2s linear infinite;
}
.hub-core-ring {
  fill: none;
  stroke: rgba(0,184,255,.3);
  stroke-dasharray: 5 9;
  animation: dashmove 3s linear infinite;
}
.hub-core {
  fill: url(#g-main);
  fill-opacity: .95;
  stroke: url(#g-main);
  stroke-width: 1.6;
  filter: drop-shadow(0 12px 26px rgba(43,77,255,.35));
}
.hub-core-text { fill: rgba(255,255,255,.92); font-size: 17px; font-weight: 700; letter-spacing: 3px; }
.hub-core-text--big { font-size: 20px; fill: #fff; }
.hub-node rect { fill: #f5f8ff; stroke: rgba(43,77,255,.25); }
.hub-node text { fill: #2c3a77; font-size: 13px; }
.l4-outcomes h4 { font-size: var(--fs-h3); margin-bottom: 22px; }
.l4-outcomes .check-list li { margin-bottom: 14px; }
@media (max-width: 1023px) {
  .l4-grid { grid-template-columns: 1fr; }
  .l4-figure { max-width: 540px; margin-inline: auto; }
}

/* ==================== 04 服务方式 ==================== */
.svc { border-top: 1px solid var(--border); }
.svc__row {
  position: relative;
  display: grid;
  grid-template-columns: 64px 1fr 380px;
  gap: 28px;
  padding: 38px 22px;
  border-bottom: 1px solid var(--border);
  border-radius: var(--r-md);
  transition: background-color .3s var(--ease), box-shadow .3s var(--ease);
}
.svc__row::before {
  content: "";
  position: absolute;
  left: 0; top: 18px; bottom: 18px;
  width: 3px;
  border-radius: 2px;
  background: var(--grad);
  opacity: 0;
  transition: opacity .3s var(--ease);
}
.svc__no {
  font-family: var(--font-num);
  font-size: 1.5rem;
  font-weight: 700;
  color: #c3c9de;
  transition: color .3s var(--ease);
}
@media (hover: hover) {
  .svc__row:hover { background: #fff; box-shadow: var(--shadow-card); }
  .svc__row:hover::before { opacity: 1; }
  .svc__row:hover .svc__no {
    background: var(--grad);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
  }
}
.svc__main h3 { display: inline-block; font-size: var(--fs-h4); margin-bottom: 2px; }
.svc__en {
  display: block;
  font-family: var(--font-num);
  font-size: .7rem;
  font-weight: 600;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--text-2);
  margin-bottom: 10px;
}
.svc__main p { color: var(--text-2); font-size: var(--fs-sm); }
.svc__row::after {
  content: "→";
  position: absolute;
  right: 22px;
  top: 38px;
  font-size: 22px;
  color: var(--blue);
  opacity: 0;
  transform: translateX(-8px);
  transition: opacity .25s var(--ease), transform .25s var(--ease);
}
@media (hover: hover) {
  .svc__row:hover::after { opacity: 1; transform: none; }
}
.svc__deliver li { font-size: var(--fs-sm); margin-bottom: 8px; }
@media (max-width: 1023px) {
  .svc__row { grid-template-columns: 56px 1fr; }
  .svc__deliver { grid-column: 2; }
}
@media (max-width: 639px) {
  .svc__row { grid-template-columns: 1fr; gap: 16px; padding: 28px 16px; }
  .svc__deliver { grid-column: 1; }
}

/* ==================== 05 典型服务场景 ==================== */
.scenarios {
  background:
    radial-gradient(rgba(20,26,60,.045) 1px, transparent 1.5px) 0 0 / 26px 26px,
    var(--bg-0);
}
.scn-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap);
}
.scn-card { padding: 38px 34px; }
.scn-card__icon {
  width: 54px; height: 54px;
  padding: 13px;
  border-radius: 13px;
  background: linear-gradient(135deg, rgba(43,77,255,.1), rgba(0,184,255,.12));
  color: var(--blue);
  margin-bottom: 18px;
}
.scn-card h3 { font-size: var(--fs-h3); margin-bottom: 8px; }
.scn-card > p { color: var(--text-2); font-size: var(--fs-sm); margin-bottom: 22px; }
@media (max-width: 1023px) {
  .scn-grid { grid-template-columns: 1fr; }
}

/* ---- 北斗时空 · 行业解决方案 ---- */
/* 这段描述较长，单独放宽 + 加大行距，避免在窄栏里挤成锯齿状居中块 */
.solutions .sec-desc {
  max-width: 860px;
  line-height: 1.95;
  text-wrap: pretty;
}

/* 能力底座：深色渐变带 */
.sol-base {
  position: relative;
  margin: clamp(8px, 2vw, 16px) 0 clamp(40px, 6vw, 64px);
  padding: clamp(28px, 4vw, 46px);
  border-radius: var(--r-lg);
  background: linear-gradient(120deg, #0c2bb3 0%, #0a1856 58%, #06123f 100%);
  color: #fff;
  overflow: hidden;
  box-shadow: var(--shadow-card);
}
.sol-base::before {
  content: "";
  position: absolute; right: -90px; top: -90px;
  width: 340px; height: 340px;
  background: radial-gradient(circle, rgba(0,184,255,.32), transparent 70%);
  pointer-events: none;
}
.sol-base::after {
  content: "";
  position: absolute; left: -60px; bottom: -120px;
  width: 280px; height: 280px;
  background: radial-gradient(circle, rgba(43,77,255,.30), transparent 70%);
  pointer-events: none;
}
.sol-base__head { position: relative; margin-bottom: 28px; }
.sol-base__eyebrow {
  display: inline-block; font-family: var(--font-num);
  font-size: var(--fs-xs); letter-spacing: .18em; color: #7fd6ff; margin-bottom: 10px;
}
.sol-base__head h3 { color: #fff; font-size: var(--fs-h3); margin-bottom: 7px; }
.sol-base__head p { color: rgba(255,255,255,.66); font-size: var(--fs-sm); }
.sol-base__head strong { color: #7fd6ff; font-weight: 700; }
.sol-base__grid {
  position: relative;
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px;
}
.sol-base__grid li {
  display: flex; flex-direction: column; gap: 8px; padding: 22px 20px;
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.13);
  border-radius: var(--r-md);
  transition: transform .35s var(--ease), background .35s var(--ease);
}
.sol-base__grid li:hover { transform: translateY(-4px); background: rgba(255,255,255,.1); }
.sol-base__ic {
  width: 44px; height: 44px; display: grid; place-items: center;
  border-radius: 12px; background: linear-gradient(135deg, #2b4dff, #00b8ff);
  box-shadow: 0 6px 16px rgba(0,120,255,.35);
}
.sol-base__ic .icon { width: 22px; height: 22px; color: #fff; }
.sol-base__grid b { color: #fff; font-size: var(--fs-base); }
.sol-base__grid > li > span:last-child { color: rgba(255,255,255,.64); font-size: var(--fs-sm); line-height: 1.5; }

/* 行业方案卡片 */
.sol-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--gap); }
.sol-card {
  display: flex; flex-direction: column; align-items: flex-start;
  padding: 34px 30px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-soft);
  position: relative; overflow: hidden;
  transition: transform .4s var(--ease), box-shadow .4s var(--ease), border-color .4s var(--ease);
}
.sol-card::before {
  content: ""; position: absolute; left: 0; top: 0; height: 3px; width: 100%;
  background: var(--grad); transform: scaleX(0); transform-origin: left;
  transition: transform .45s var(--ease);
}
.sol-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-card); border-color: transparent; }
.sol-card:hover::before { transform: scaleX(1); }
.sol-card__ic {
  width: 54px; height: 54px; display: grid; place-items: center;
  border-radius: 13px; margin-bottom: 18px;
  background: linear-gradient(135deg, rgba(43,77,255,.1), rgba(0,184,255,.12));
  color: var(--blue);
  transition: transform .4s var(--ease);
}
.sol-card:hover .sol-card__ic { transform: scale(1.06); }
.sol-card__ic .icon { width: 27px; height: 27px; }
.sol-card h3 { font-size: var(--fs-h3); margin-bottom: 10px; }
.sol-card > p { color: var(--text-2); font-size: var(--fs-sm); margin-bottom: 18px; }
.sol-card__tags { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 24px; }
.sol-card__tags li {
  font-size: var(--fs-xs); color: var(--text-1);
  background: var(--bg-1); border: 1px solid var(--border);
  border-radius: var(--r-full); padding: 5px 12px;
}
.sol-card__more {
  margin-top: auto; display: inline-flex; align-items: center; gap: 6px;
  color: var(--blue); font-weight: 600; font-size: var(--fs-sm);
}
.sol-card__more .icon { width: 16px; height: 16px; transition: transform .3s var(--ease); }
.sol-card:hover .sol-card__more .icon { transform: translateX(5px); }

/* CTA 卡片：横跨整行的 Banner */
.sol-card--cta {
  grid-column: 1 / -1;
  flex-direction: row; align-items: center; gap: 26px;
  padding: 30px 40px;
  background: var(--grad-deep); border: none; color: #fff;
}
.sol-card--cta::before { display: none; }
.sol-card--cta__txt { flex: 1 1 auto; }
.sol-card--cta h3 { color: #fff; margin-bottom: 6px; }
.sol-card--cta p { color: rgba(255,255,255,.82); font-size: var(--fs-sm); }
.sol-card--cta .sol-card__ic { flex: none; margin-bottom: 0; background: rgba(255,255,255,.16); color: #fff; }
.sol-card--cta:hover .sol-card__ic { background: rgba(255,255,255,.24); }
.sol-card--cta .sol-card__more { flex: none; margin-top: 0; font-size: 1rem; color: #7fd6ff; }
@media (max-width: 640px) {
  .sol-card--cta { flex-direction: column; align-items: flex-start; gap: 14px; padding: 30px; }
}

@media (max-width: 1023px) {
  .sol-base__grid { grid-template-columns: 1fr 1fr; }
  .sol-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .sol-base__grid { grid-template-columns: 1fr; }
  .sol-grid { grid-template-columns: 1fr; }
}

/* ==================== 06 案例与客户 ==================== */
.marquee {
  display: grid;
  gap: 18px;
  margin-bottom: clamp(48px, 7vw, 72px);
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
}
.marquee__row { overflow: hidden; }
.marquee__track {
  display: flex;
  width: max-content;
  animation: marquee 64s linear infinite;
}
.marquee__row--reverse .marquee__track { animation-direction: reverse; }
@media (hover: hover) {
  .marquee__row:hover .marquee__track { animation-play-state: paused; }
}
.marquee__list { display: flex; gap: 18px; padding-right: 18px; }
.client-chip {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 9px 24px 9px 11px;
  border-radius: var(--r-full);
  background: #fff;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-soft);
  color: var(--text-1);
  font-size: var(--fs-sm);
  font-weight: 500;
  white-space: nowrap;
}
.client-chip__badge {
  display: grid;
  place-items: center;
  width: 32px; height: 32px;
  border-radius: 10px;
  background: #eef2ff;
  border: 1px solid var(--border);
}
.client-chip__badge .icon { width: 17px; height: 17px; color: var(--blue); }
.client-chip__badge--img {
  background: #fff;
  padding: 3px;
}
.client-chip__badge--img img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}
/* 深色徽章：用于本身为白色版（专为深色背景设计）的 logo */
.client-chip__badge--dark {
  background: #143a5a;
  border-color: #143a5a;
}

/* 生态合作伙伴 · 居中 logo 网格 */
.partners { padding-top: clamp(64px, 9vw, 120px); padding-bottom: clamp(64px, 9vw, 120px); }
.partner-grid {
  display: flex; flex-wrap: wrap; justify-content: center;
  gap: 16px;
  max-width: 1180px; margin: clamp(32px, 4vw, 48px) auto 0;
}
.partner-grid .client-chip {
  box-shadow: var(--shadow-soft);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s var(--ease);
}
@media (hover: hover) {
  .partner-grid .client-chip:hover { transform: translateY(-3px); box-shadow: var(--shadow-card); border-color: var(--border-hover); }
}

/* ----- 精选案例卡片（参照站图片墙风格） ----- */
.cases__sub {
  text-align: center;
  font-size: var(--fs-h3);
  margin-bottom: 30px;
}
.featured-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--gap);
  margin-bottom: clamp(48px, 7vw, 72px);
}
.case-card {
  padding: 0;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.case-card__media {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: #0d1340;
}
.case-card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.94);
  transition: transform .45s var(--ease);
}
/* 统一压色层：抹平不同截图的明暗差 */
.case-card__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(11,18,64,.06) 0%, rgba(11,18,64,.38) 100%);
  box-shadow: inset 0 0 0 1px rgba(15,23,42,.06);
  pointer-events: none;
}
.case-card__tag {
  position: absolute;
  top: 12px; left: 12px;
  z-index: 1;
  padding: 4px 12px;
  border-radius: 7px;
  background: var(--grad);
  color: #fff;
  font-size: var(--fs-xs);
  font-weight: 500;
  box-shadow: 0 4px 14px rgba(20,40,140,.35);
}
.case-card__body {
  padding: 18px 20px 22px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 1;
}
.case-card h4 { font-size: 1.02rem; }
.case-card__body p { font-size: var(--fs-xs); color: var(--text-2); }
@media (hover: hover) {
  .case-card:hover .case-card__media img { transform: scale(1.05); }
}
@media (max-width: 1023px) {
  .featured-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 639px) {
  .featured-grid { grid-template-columns: 1fr; }
}

.case-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}
.case-cat {
  grid-column: 1 / -1;
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--blue);
  opacity: .7;
  padding: 6px 0 2px;
  margin-top: 6px;
  border-bottom: 1px solid var(--border);
  list-style: none;
}
.case-tile {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px 18px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-soft);
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--text-1);
  transition: transform .25s var(--ease), border-color .25s var(--ease), color .25s var(--ease), box-shadow .25s var(--ease);
}
.case-tile .icon {
  width: 34px; height: 34px;
  padding: 8px;
  border-radius: 50%;
  background: rgba(43,77,255,.08);
  color: var(--blue);
}
.case-tile:nth-child(even) .icon { background: rgba(0,184,255,.1); }
@media (hover: hover) {
  .case-tile:hover {
    transform: translateY(-3px);
    border-color: var(--border-hover);
    color: var(--text-0);
    box-shadow: var(--shadow-card);
  }
}
@media (max-width: 1199px) {
  .case-grid { grid-template-columns: repeat(4, 1fr); }
}
@media (max-width: 1023px) {
  .case-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 767px) {
  .case-grid { grid-template-columns: 1fr 1fr; }
}

/* ==================== 07 产教研资源优势 ==================== */
.res__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(32px, 6vw, 72px);
  align-items: start;
  margin-top: clamp(24px, 4vw, 40px);
}
.res__desc { margin: 0; line-height: 1.8; color: var(--text-1); }
.res__unis {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 20px;
}
.uni-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 20px;
  background: #f8f9fe;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
}
.uni-card__ring {
  display: grid;
  place-items: center;
  width: 44px; height: 44px;
  border-radius: 50%;
  border: 1px solid rgba(43,77,255,.3);
  background: #eef2ff;
}
.uni-card__ring .icon { width: 20px; height: 20px; color: var(--blue); }
.uni-card__name { font-weight: 600; color: var(--text-0); flex: 1; }
.uni-card__tag {
  font-size: var(--fs-xs);
  color: var(--blue);
  border: 1px solid rgba(43,77,255,.3);
  padding: 3px 10px;
  border-radius: var(--r-full);
  white-space: nowrap;
}
.res__support { padding-top: 8px; }
.res__support h3 { font-size: var(--fs-h3); margin-bottom: 24px; }
.res__support .check-list li { margin-bottom: 16px; }
.res__photos {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--gap);
  margin-top: clamp(40px, 6vw, 64px);
}
.res-photo { margin: 0; }
.res-photo img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--r-md);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-soft);
}
.res-photo figcaption {
  margin-top: 10px;
  font-size: var(--fs-xs);
  color: var(--text-2);
  text-align: center;
}
/* 产教研子版块 */
.res__block {
  margin-top: clamp(48px, 7vw, 72px);
  padding-top: clamp(36px, 5vw, 52px);
  border-top: 1px solid var(--border);
}
.res__block-title {
  font-size: var(--fs-h3);
  font-weight: 700;
  color: var(--text-0);
  margin-bottom: 8px;
}
.res__block-desc {
  color: var(--text-2);
  font-size: var(--fs-sm);
  margin-bottom: 28px;
  max-width: 680px;
}
/* 奖项 pill 列表 */
.award-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 32px;
  list-style: none;
  padding: 0;
}
.award-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 20px;
  font-size: var(--fs-xs);
  font-weight: 500;
  line-height: 1.4;
}
.award-pill--gold   { background: #fff8e1; color: #a06000; border: 1px solid #ffe082; }
.award-pill--silver { background: #f3f4f6; color: #4b5563; border: 1px solid #d1d5db; }
.award-pill--blue   { background: #eff6ff; color: #1d4ed8; border: 1px solid #bfdbfe; }
/* 证书照片网格 */
.res__certs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 24px;
}
.cert-photo { margin: 0; }
.cert-photo img {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  object-position: top;
  border-radius: var(--r-sm);
  box-shadow: var(--shadow-soft);
}
.cert-photo figcaption {
  margin-top: 8px;
  font-size: 11px;
  color: var(--text-2);
  text-align: center;
  line-height: 1.4;
}
/* 学术会议布局 */
.conf-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}
.conf-list { list-style: none; padding: 0; }
.conf-list li {
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
  font-size: var(--fs-sm);
  color: var(--text-1);
  display: flex;
  align-items: baseline;
  gap: 10px;
}
.conf-list li::before {
  content: "▸";
  color: var(--blue);
  font-size: 10px;
  flex-shrink: 0;
}
.conf-photo img {
  width: 100%;
  border-radius: var(--r-md);
  box-shadow: var(--shadow-soft);
}
.conf-photo figcaption {
  margin-top: 8px;
  font-size: var(--fs-xs);
  color: var(--text-2);
}
/* 课题科研列表 */
.proj-list {
  list-style: none;
  padding: 0;
  counter-reset: proj;
  margin-bottom: 32px;
}
.proj-list li {
  counter-increment: proj;
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
  font-size: var(--fs-sm);
  color: var(--text-1);
}
.proj-list li::before {
  content: counter(proj, decimal-leading-zero);
  font-size: 11px;
  font-weight: 700;
  color: var(--blue);
  opacity: .6;
  flex-shrink: 0;
  min-width: 22px;
}
.res__docs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.doc-photo img {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  object-position: top;
  border-radius: var(--r-sm);
  box-shadow: var(--shadow-soft);
}
.doc-photo figcaption {
  margin-top: 8px;
  font-size: 11px;
  color: var(--text-2);
  text-align: center;
}
/* AI实训 */
.ai-train-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}
.ai-train-row img {
  width: 100%;
  border-radius: var(--r-md);
  box-shadow: var(--shadow-soft);
}
@media (max-width: 1023px) {
  .res__grid { grid-template-columns: 1fr; }
  .conf-row, .ai-train-row { grid-template-columns: 1fr; }
}
@media (max-width: 767px) {
  .res__unis { grid-template-columns: 1fr; }
  .res__photos, .res__certs { grid-template-columns: repeat(2, 1fr); }
  .res__docs { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 639px) {
  .check-list--2col { grid-template-columns: 1fr; }
  .res__certs { grid-template-columns: repeat(2, 1fr); }
}

/* ==================== 08 落地原则（深色色块带） ==================== */
.principles {
  background:
    radial-gradient(60% 90% at 80% 0%, rgba(0,184,255,.22), transparent 60%),
    radial-gradient(46% 70% at 8% 100%, rgba(104,61,255,.24), transparent 62%),
    linear-gradient(60deg, #0d2fd0 0%, #071a6e 100%);
}
.principles .sec-eyebrow { color: #7fd8ff; }
.principles .grad-text {
  background: linear-gradient(92deg, #a4ecff 0%, #00d4ff 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.principles__band {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  padding-block: clamp(32px, 5vw, 52px);
}
.principles__band::before,
.principles__band::after {
  content: "";
  position: absolute;
  left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,.28), transparent);
}
.principles__band::before { top: 0; }
.principles__band::after { bottom: 0; }
.principle { position: relative; padding: 12px 32px; }
.principle + .principle::before {
  content: "";
  position: absolute;
  left: 0; top: 10%; bottom: 10%;
  width: 1px;
  background: linear-gradient(180deg, transparent, rgba(255,255,255,.2), transparent);
}
.principle__char {
  display: block;
  font-family: "STKaiti", "KaiTi", "楷体", serif;
  font-size: 68px;
  line-height: 1;
  margin-bottom: 20px;
  background: linear-gradient(92deg, #a4ecff 0%, #00d4ff 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.principle h3 { font-size: 1.05rem; margin-bottom: 10px; }
.principle p { font-size: var(--fs-sm); color: rgba(214,224,255,.72); }
@media (max-width: 1023px) {
  .principles__band { grid-template-columns: 1fr 1fr; row-gap: 40px; }
  .principle:nth-child(3)::before { display: none; }
}
@media (max-width: 639px) {
  .principles__band { grid-template-columns: 1fr; row-gap: 32px; }
  .principle { padding: 0 8px; }
  .principle + .principle::before { display: none; }
}

/* ==================== 09 合作流程 ==================== */
.process__steps {
  position: relative;
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 18px;
}
.process__steps::before {
  content: "";
  position: absolute;
  top: 28px;
  left: calc(100% / 12);
  right: calc(100% / 12);
  height: 2px;
  background: linear-gradient(90deg, rgba(43,77,255,.5), rgba(0,184,255,.5));
}
.step { text-align: center; padding: 0 6px; }
.step__dot {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 56px; height: 56px;
  margin: 0 auto 18px;
  border-radius: 50%;
  background: var(--grad);
  box-shadow: 0 0 0 8px var(--bg-1), 0 10px 24px rgba(43,77,255,.32);
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 1.25rem;
  color: #fff;
}
.step h3 { font-size: 1rem; margin-bottom: 8px; }
.step p { font-size: var(--fs-xs); color: var(--text-2); }
@media (max-width: 1023px) {
  .process__steps { grid-template-columns: 1fr; gap: 32px; }
  .process__steps::before {
    top: 28px; bottom: 28px;
    left: 27px; right: auto;
    width: 2px; height: auto;
    background: linear-gradient(180deg, rgba(43,77,255,.35), rgba(0,184,255,.35));
  }
  .step {
    display: grid;
    grid-template-columns: 56px 1fr;
    column-gap: 20px;
    text-align: left;
    align-items: start;
  }
  .step__dot { margin: 0; grid-row: 1 / 3; }
  .step h3, .step p { grid-column: 2; }
}

/* ==================== 10/11 CTA 渐变带 + 联系 ==================== */
.contact { background: var(--bg-0); }
.cta-band {
  position: relative;
  overflow: hidden;
  padding-block: clamp(104px, 13vw, 176px);
  background:
    radial-gradient(50% 80% at 80% 12%, rgba(0,212,255,.32), transparent 60%),
    radial-gradient(44% 70% at 12% 90%, rgba(124,61,255,.4), transparent 62%),
    linear-gradient(120deg, #0c1e8c 0%, #2b4dff 52%, #0096d8 100%);
}
.cta-band__pattern {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255,255,255,.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.07) 1px, transparent 1px);
  background-size: 48px 48px;
  -webkit-mask-image: radial-gradient(ellipse 75% 90% at 50% 50%, #000 30%, transparent 78%);
  mask-image: radial-gradient(ellipse 75% 90% at 50% 50%, #000 30%, transparent 78%);
}
.cta {
  position: relative;
  text-align: center;
}
.cta__title {
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  font-weight: 800;
  color: #fff;
  margin-bottom: 24px;
}
.cta__slogan {
  font-size: clamp(1.1rem, 1.8vw, 1.35rem);
  font-weight: 500;
  color: rgba(235,242,255,.88);
  margin-bottom: 44px;
}
.cta__actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

.contact .contact-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--gap);
  padding-block: clamp(52px, 7vw, 80px);
}
.contact-item { display: flex; flex-direction: column; gap: 4px; }
.contact-item .icon { color: var(--blue); margin-bottom: 8px; }
.contact-item__label {
  font-size: var(--fs-xs);
  letter-spacing: .12em;
  color: var(--text-2);
}
.contact-item a, .contact-item span:not(.contact-item__label) {
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--text-0);
}
.contact-item a { transition: color .25s var(--ease); }
@media (hover: hover) {
  .contact-item a:hover { color: var(--blue); }
}
@media (max-width: 1023px) {
  .contact .contact-grid { grid-template-columns: 1fr 1fr; row-gap: 36px; }
}
@media (max-width: 639px) {
  .contact .contact-grid { grid-template-columns: 1fr; }
}

/* ==================== 页脚（深色，与 Hero 形成首尾呼应） ==================== */
.footer {
  background: #080c1e;
  border-top: none;
  position: relative;
}
.footer::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, #2b4dff 30%, #00b8ff 70%, transparent);
}
.footer__grid {
  display: grid;
  grid-template-columns: 1.2fr 1.4fr 1fr;
  gap: clamp(28px, 5vw, 56px);
  padding-block: clamp(44px, 6vw, 68px);
}
.footer .nav__name { color: rgba(255,255,255,.9); }
.footer__brand p {
  margin-top: 16px;
  color: rgba(255,255,255,.42);
  font-size: var(--fs-sm);
  line-height: 1.8;
}
.footer__brand p.footer__motto {
  letter-spacing: .3em;
  font-size: var(--fs-xs);
  margin-top: 10px;
  color: rgba(0,184,255,.5);
}
.footer h3 {
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: rgba(255,255,255,.35);
  margin-bottom: 18px;
}
.footer__nav {
  display: grid;
  grid-template-columns: auto auto;
  gap: 0 48px;
  align-content: start;
  justify-content: start;
}
.footer__nav h3 { grid-column: 1 / -1; }
.footer__nav a {
  display: block;
  padding: 5px 0;
  font-size: var(--fs-sm);
  color: rgba(255,255,255,.5);
  transition: color .22s var(--ease);
}
@media (hover: hover) {
  .footer__nav a:hover { color: #00b8ff; }
}
.footer__contact p {
  font-size: var(--fs-sm);
  color: rgba(255,255,255,.5);
  margin-bottom: 8px;
}
.footer__contact a { color: rgba(255,255,255,.72); }
@media (hover: hover) {
  .footer__contact a:hover { color: #00b8ff; }
}
.footer__bottom {
  border-top: 1px solid rgba(255,255,255,.07);
  background: rgba(0,0,0,.25);
  padding-block: 18px;
}
.footer__bottom p {
  font-size: var(--fs-xs);
  color: rgba(255,255,255,.28);
  text-align: center;
}
.footer__bottom a { color: rgba(255,255,255,.38); }
@media (hover: hover) {
  .footer__bottom a:hover { color: rgba(255,255,255,.65); }
}
@media (max-width: 1023px) {
  .footer__grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 639px) {
  .footer__grid { grid-template-columns: 1fr; }
}

/* ==================== 返回顶部 ==================== */
.to-top {
  position: fixed;
  right: 24px; bottom: 24px;
  z-index: 80;
  width: 46px; height: 46px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: #fff;
  border: 1px solid var(--border);
  box-shadow: 0 10px 28px rgba(20,26,60,.16);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity .3s var(--ease), transform .3s var(--ease), visibility .3s, border-color .3s var(--ease), box-shadow .3s var(--ease);
}
.to-top .icon {
  width: 20px; height: 20px;
  color: var(--text-1);
  transform: rotate(-90deg);
}
.to-top.show { opacity: 1; visibility: visible; transform: none; }
@media (hover: hover) {
  .to-top:hover { border-color: var(--border-hover); box-shadow: var(--glow-blue); }
}

/* ======================================================
   悬浮 AI 诊断入口（FAB）
   ====================================================== */
@keyframes fab-glow {
  0%, 100% { box-shadow: 0 4px 20px rgba(43,111,255,.5), 0 0 0 0 rgba(0,212,255,.45); }
  55%       { box-shadow: 0 4px 20px rgba(43,111,255,.5), 0 0 0 10px rgba(0,212,255,.0); }
}
.fab-diag {
  position: fixed;
  right: 24px;
  bottom: 82px;  /* 24px gap + 46px to-top height + 12px */
  z-index: 200;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  width: 58px;
  padding: 14px 8px 12px;
  border-radius: 16px;
  background: linear-gradient(160deg, #2b4dff 0%, #00b4e6 100%);
  color: #fff;
  text-decoration: none;
  font-family: inherit;
  animation: fab-glow 2.8s ease infinite;
  transition: transform .18s, opacity .18s;
}
.fab-diag:hover {
  transform: translateY(-3px) scale(1.06);
  animation: none;
  box-shadow: 0 8px 32px rgba(43,111,255,.7);
}
.fab-diag svg {
  width: 22px; height: 22px;
  stroke: #fff;
  flex-shrink: 0;
}
.fab-diag__txt {
  font-size: .62rem;
  font-weight: 700;
  letter-spacing: .06em;
  line-height: 1.35;
  text-align: center;
  color: rgba(255,255,255,.95);
}
@media (max-width: 480px) {
  .fab-diag { right: 12px; bottom: 72px; width: 52px; padding: 12px 6px 10px; }

  /* Hero CTA：按钮纵向排列，全宽触控 */
  .hero__cta {
    flex-direction: column;
    align-items: center;
    gap: 12px;
  }
  .hero__cta .btn {
    width: 100%;
    max-width: 290px;
    justify-content: center;
  }
  .hero__sub { font-size: .88rem; padding: 0 8px; }

  /* 统计数字在极小屏缩放友好 */
  .stat__num { font-size: clamp(2rem, 10vw, 2.8rem); }
}

/* ============================================================
   企业宣传片：hero 播放入口 + 全屏弹窗
   ============================================================ */
.hero__film {
  background: transparent;
  cursor: pointer;
  font-family: inherit;
}
.hero__film-ico { width: 19px; height: 19px; flex: 0 0 auto; }

.video-modal { position: fixed; inset: 0; z-index: 300; display: flex; align-items: center; justify-content: center; }
.video-modal[hidden] { display: none; }
.video-modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(4,6,14,.88);
  cursor: pointer;
}
.video-modal__body {
  position: relative;
  width: min(92vw, 1100px);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: #0a0e1a;
  box-shadow: 0 30px 90px rgba(0,0,0,.6);
}
.video-modal__body video { display: block; width: 100%; height: auto; }
.video-modal__close {
  position: absolute;
  top: 10px;
  right: 10px;
  z-index: 1;
  width: 44px;
  height: 44px;
  border: none;
  border-radius: 50%;
  background: rgba(0,0,0,.55);
  color: #fff;
  font-size: 26px;
  line-height: 1;
  cursor: pointer;
  transition: background .25s var(--ease);
}
.video-modal__close:hover { background: rgba(0,0,0,.8); }


/* ============================================================
   联系区:左联系面板 + 右留资表单(两栏一体)
   ============================================================ */
.contact-wrap {
  display: grid;
  grid-template-columns: 5fr 7fr;
  gap: 28px;
  align-items: stretch;
  padding-block: clamp(52px, 7vw, 80px);
}
.contact-panel {
  font-style: normal;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 34px 32px;
  box-shadow: var(--shadow-soft);
  display: flex;
  flex-direction: column;
  gap: 22px;
}
.contact-panel__title { font-size: 1.2rem; font-weight: 800; color: var(--text-0); }
.contact-line { display: flex; gap: 14px; align-items: flex-start; }
.contact-line .icon { color: var(--blue); flex: 0 0 auto; margin-top: 3px; }
.contact-line > div { display: flex; flex-direction: column; gap: 3px; }
.contact-line__label { font-size: var(--fs-xs); letter-spacing: .12em; color: var(--text-2); }
.contact-line__big {
  font-family: var(--font-num);
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-0);
  text-decoration: none;
}
.contact-line__big em { font-style: normal; font-family: var(--font-sans); font-size: .85rem; font-weight: 600; color: var(--text-2); margin-left: 8px; }
.contact-wechat {
  margin-top: auto;
  display: flex;
  gap: 18px;
  align-items: center;
  padding: 18px;
  background: var(--grad-soft);
  border: 1px solid rgba(43,77,255,.18);
  border-radius: var(--r-md);
}
.contact-wechat img {
  flex: 0 0 auto;
  border-radius: var(--r-sm);
  border: 1px solid var(--border);
  background: #fff;
}
.contact-wechat__txt { display: flex; flex-direction: column; gap: 6px; }
.contact-wechat__txt strong { font-size: 1rem; color: var(--text-0); }
.contact-wechat__txt span { font-size: var(--fs-sm); color: var(--text-1); line-height: 1.6; }

.lead-form-wrap {
  background: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 34px 32px;
  text-align: center;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.lead-form__title { font-size: 1.2rem; font-weight: 800; color: var(--text-0); }
.lead-form__sub { font-size: var(--fs-sm); color: var(--text-2); margin: 8px 0 20px; }
.lead-form__fields { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-bottom: 18px; }
.lead-form__input {
  width: 100%;
  padding: 13px 16px;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  font-size: var(--fs-sm);
  font-family: inherit;
  color: var(--text-0);
  background: #fff;
  outline: none;
  transition: border-color .25s var(--ease);
}
.lead-form__input:focus { border-color: var(--blue); }
.lead-form__textarea { grid-column: 1 / -1; resize: vertical; }
.lead-form .btn { justify-self: center; margin: 0 auto; }
.lead-form__msg { margin-top: 12px; font-size: var(--fs-sm); min-height: 1.4em; }
.lead-form__msg.is-ok { color: #0a8a4a; font-weight: 600; }
.lead-form__msg.is-err { color: var(--crest); }

@media (max-width: 900px) {
  .contact-wrap { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .lead-form__fields { grid-template-columns: 1fr; }
  .contact-panel, .lead-form-wrap { padding: 24px 18px; }
  .contact-wechat { flex-direction: row; }
}