/* ============= 基础变量 ============= */
:root {
  /* 主题色 - 取自 Ainice 产品ok.pptx */
  --c-deep-1: #061A40;     /* 最深蓝 - 大背景、标题 */
  --c-deep-2: #0A2540;     /* 深蓝 - 卡片背景 */
  --c-deep-3: #0F2E5C;     /* 中深蓝 - 悬浮 */
  --c-brand-1: #003D7A;    /* 品牌深蓝 */
  --c-brand-2: #1E5BFF;    /* 亮蓝主色 - 按钮/重点 */
  --c-brand-3: #2563EB;    /* 标准蓝 */
  --c-brand-4: #4DA6FF;    /* 浅蓝 */
  --c-sky-1: #B0D0F0;      /* 极浅蓝 */
  --c-sky-2: #E0F0F0;      /* 背景浅蓝 */
  --c-sky-3: #EAF3FB;      /* 极浅蓝 */
  --c-line: #E5EBF2;       /* 浅灰描边 */
  --c-line-dark: rgba(255,255,255,0.12);
  --c-text: #0A2540;       /* 主文字 */
  --c-text-2: #3B475C;     /* 次文字 */
  --c-text-3: #6B7280;     /* 浅文字 */
  --c-text-light: #FFFFFF;
  --c-text-light-2: rgba(255,255,255,0.7);

  /* 渐变 */
  --grad-hero: radial-gradient(ellipse at 20% 0%, #1E5BFF 0%, #003D7A 35%, #061A40 100%);
  --grad-cta: linear-gradient(135deg, #1E5BFF 0%, #2563EB 100%);
  --grad-blue: linear-gradient(135deg, #4DA6FF 0%, #1E5BFF 100%);
  --grad-sky: linear-gradient(180deg, #F0F7FF 0%, #FFFFFF 100%);
  --grad-card-dark: linear-gradient(135deg, rgba(30,91,255,0.18) 0%, rgba(13,46,92,0.55) 100%);

  /* 阴影 */
  --shadow-sm: 0 2px 8px rgba(10,37,64,0.06);
  --shadow-md: 0 8px 24px rgba(10,37,64,0.08);
  --shadow-lg: 0 20px 60px rgba(10,37,64,0.12);
  --shadow-glow: 0 12px 40px rgba(30,91,255,0.35);

  /* 字号 */
  --fs-h1: clamp(2.4rem, 5vw, 4.2rem);
  --fs-h2: clamp(1.9rem, 3.5vw, 2.8rem);
  --fs-h3: clamp(1.2rem, 2vw, 1.5rem);
  --fs-body: 1rem;
  --fs-lead: clamp(1rem, 1.4vw, 1.125rem);

  /* 间距 */
  --gap: clamp(3rem, 6vw, 5rem);
  --pad-x: clamp(1.25rem, 4vw, 2.5rem);
  --radius: 16px;
  --radius-lg: 24px;

  /* 字体(纯系统字体栈,零外部请求,国内秒开) */
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
               "Microsoft YaHei", "Microsoft JhengHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: 1.7;
  color: var(--c-text);
  background: #FFFFFF;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; transition: color .2s; }
button { font: inherit; border: none; background: none; cursor: pointer; color: inherit; }
ul { list-style: none; }

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--pad-x);
}

/* ============= 通用按钮 ============= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: 0.85rem 1.75rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: .02em;
  transition: all .25s ease;
  cursor: pointer;
  white-space: nowrap;
  border: 1px solid transparent;
}
.btn-primary {
  background: var(--grad-cta);
  color: #fff;
  box-shadow: 0 8px 24px rgba(30,91,255,0.32);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 14px 32px rgba(30,91,255,0.45); }
.btn-ghost {
  background: rgba(255,255,255,0.08);
  color: #fff;
  border: 1px solid rgba(255,255,255,0.25);
  backdrop-filter: blur(8px);
}
.btn-ghost:hover { background: rgba(255,255,255,0.15); }
.btn-lg { padding: 1.05rem 2.25rem; font-size: 1rem; }
.btn-block { width: 100%; }

/* ============= 导航 ============= */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 1rem 0;
  background: transparent;
  transition: all .35s ease;
}
.nav.is-scrolled {
  background: rgba(255,255,255,0.85);
  backdrop-filter: saturate(180%) blur(18px);
  -webkit-backdrop-filter: saturate(180%) blur(18px);
  box-shadow: 0 4px 20px rgba(10,37,64,0.06);
  padding: .65rem 0;
}
.nav.is-scrolled .logo-text,
.nav.is-scrolled .nav-links a { color: var(--c-text); }
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}
.logo {
  display: flex; align-items: center; gap: .55rem;
  position: relative;
  height: 32px;
}
.logo-mark {
  display: inline-flex;
  align-items: center;
  height: 100%;
  transition: opacity .3s;
}
.logo-mark img {
  height: 100%;
  width: auto;
  display: block;
}
.logo-mark-dark { opacity: 1; }
.logo-mark-light { display: none; }
.logo-text {
  font-weight: 800;
  letter-spacing: .2em;
  color: #fff;
  font-size: 1.05rem;
  transition: color .3s;
}
.nav.is-scrolled .logo-mark-dark { display: none; }
.nav.is-scrolled .logo-mark-light { display: inline-flex; }
.nav-links {
  display: flex;
  align-items: center;
  gap: 1.85rem;
}
.nav-links a {
  color: rgba(255,255,255,0.88);
  font-size: 0.9rem;
  font-weight: 500;
  position: relative;
  padding: .35rem 0;
  transition: color .2s;
}
.nav-links a:hover { color: #fff; }
.nav-links a::after {
  content: '';
  position: absolute; left: 0; right: 100%; bottom: 0;
  height: 2px; background: #fff;
  transition: right .25s ease;
}
.nav-links a:hover::after { right: 0; }
.nav-cta {
  background: #fff;
  color: var(--c-brand-2) !important;
  padding: .55rem 1.25rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.88rem;
  transition: all .25s;
}
.nav.is-scrolled .nav-cta { background: var(--grad-cta); color: #fff !important; }
.nav.is-scrolled .nav-cta:hover { transform: translateY(-1px); box-shadow: var(--shadow-glow); }
.nav-cta:hover { transform: translateY(-1px); }
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: 8px;
}
.nav-toggle span {
  width: 24px; height: 2px;
  background: #fff;
  transition: all .25s;
  border-radius: 2px;
}
.nav.is-scrolled .nav-toggle span { background: var(--c-text); }

/* ============= Hero ============= */
.hero {
  position: relative;
  min-height: min(100vh, 820px);
  background: var(--grad-hero);
  color: #fff;
  overflow: hidden;
  display: flex;
  align-items: center;
  padding: 7rem 0 4rem;
}
.hero-bg {
  position: absolute; inset: 0;
  z-index: 0;
  pointer-events: none;
}
.hero-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.55;
  animation: orb-float 14s ease-in-out infinite;
}
.hero-orb-1 {
  width: 480px; height: 480px;
  background: radial-gradient(circle, #4DA6FF 0%, transparent 70%);
  top: -120px; right: -80px;
}
.hero-orb-2 {
  width: 380px; height: 380px;
  background: radial-gradient(circle, #2563EB 0%, transparent 70%);
  bottom: -100px; left: -60px;
  animation-delay: -7s;
}
@keyframes orb-float {
  0%, 100% { transform: translate(0,0) scale(1); }
  50% { transform: translate(40px, -30px) scale(1.08); }
}
.hero-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at center, #000 30%, transparent 75%);
}
.hero-inner {
  position: relative; z-index: 1;
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 3rem;
  align-items: center;
}
.hero-tag {
  display: inline-flex; align-items: center; gap: .5rem;
  padding: .4rem 1rem;
  border: 1px solid rgba(255,255,255,0.2);
  background: rgba(255,255,255,0.06);
  backdrop-filter: blur(8px);
  border-radius: 999px;
  font-size: .85rem;
  color: rgba(255,255,255,0.85);
  margin-bottom: 1.5rem;
}
.hero-tag .dot {
  width: 6px; height: 6px;
  background: #4DA6FF;
  border-radius: 50%;
  box-shadow: 0 0 12px #4DA6FF;
  animation: pulse 1.6s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: .5; transform: scale(1.4); }
}
.hero-title {
  font-weight: 900;
  line-height: 1.05;
  margin-bottom: 1.5rem;
}
.hero-title-en {
  display: block;
  font-size: clamp(1.5rem, 2.5vw, 2rem);
  font-weight: 400;
  letter-spacing: .04em;
  color: rgba(255,255,255,0.7);
  margin-bottom: .5rem;
}
.hero-title-cn {
  display: block;
  font-size: clamp(1.85rem, 4.4vw, 3.4rem);
  background: linear-gradient(180deg, #fff 0%, #B0D0F0 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: .04em;
  white-space: nowrap;
}
.hero-sub {
  font-size: var(--fs-lead);
  color: rgba(255,255,255,0.78);
  margin-bottom: 2.25rem;
  max-width: 540px;
}
.hero-actions {
  display: flex; gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 3rem;
}
.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(255,255,255,0.12);
  max-width: 540px;
}
.stat { text-align: left; }
.stat-num {
  font-size: 1.85rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: .25rem;
  letter-spacing: -.02em;
}
.stat-label {
  font-size: .8rem;
  color: rgba(255,255,255,0.6);
  letter-spacing: .02em;
}

/* Hero 右侧视觉 */
.hero-visual {
  position: relative;
  height: 480px;
}
.hero-card {
  position: absolute;
  background: var(--grad-card-dark);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: var(--radius);
  backdrop-filter: blur(16px);
  box-shadow: 0 20px 60px rgba(0,0,0,0.35);
  color: #fff;
}
.hero-card-main {
  width: 100%;
  top: 0; right: 0;
  padding: 1.5rem 1.75rem;
  animation: card-float 6s ease-in-out infinite;
}
@keyframes card-float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}
.card-header {
  display: flex; align-items: center; gap: .75rem;
  padding-bottom: 1.25rem;
  margin-bottom: 1.25rem;
  border-bottom: 1px solid rgba(255,255,255,0.12);
}
.card-icon {
  width: 38px; height: 38px;
  background: var(--grad-blue);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-weight: 900;
  font-size: 1.2rem;
  box-shadow: 0 4px 12px rgba(30,91,255,0.5);
}
.card-title { font-weight: 700; font-size: 1rem; }
.card-steps {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: .65rem .85rem;
}
.card-steps li {
  display: flex; align-items: center; gap: .5rem;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.85);
}
.step-num {
  flex: 0 0 22px;
  width: 22px; height: 22px;
  background: rgba(77,166,255,0.2);
  color: #4DA6FF;
  border-radius: 6px;
  display: flex; align-items: center; justify-content: center;
  font-size: .72rem;
  font-weight: 700;
}
.card-pulse {
  position: absolute;
  top: -6px; right: -6px;
  width: 14px; height: 14px;
  background: #4DA6FF;
  border-radius: 50%;
  box-shadow: 0 0 0 0 rgba(77,166,255,0.7);
  animation: pulse-ring 1.8s ease-out infinite;
}
@keyframes pulse-ring {
  0% { box-shadow: 0 0 0 0 rgba(77,166,255,0.6); }
  100% { box-shadow: 0 0 0 16px rgba(77,166,255,0); }
}
.hero-card-mini {
  width: 180px;
  bottom: 30px; left: -20px;
  padding: 1.1rem 1.25rem;
  animation: card-float 6s ease-in-out infinite;
  animation-delay: -3s;
}
.mini-tag {
  font-size: .75rem;
  color: rgba(255,255,255,0.6);
  margin-bottom: .35rem;
}
.mini-title {
  font-size: 1.1rem;
  font-weight: 800;
  margin-bottom: .85rem;
}
.mini-line {
  height: 4px;
  width: 60%;
  background: var(--grad-blue);
  border-radius: 2px;
}
.hero-card-tag {
  width: 200px;
  top: -10px; left: -10px;
  padding: 0.85rem 1.1rem;
  display: flex; align-items: center; gap: .65rem;
  animation: card-float 6s ease-in-out infinite;
  animation-delay: -1.5s;
}
.tag-dot {
  width: 10px; height: 10px;
  background: #4DA6FF;
  border-radius: 50%;
  box-shadow: 0 0 8px #4DA6FF;
}
.tag-title { font-size: .85rem; font-weight: 700; }
.tag-sub { font-size: .72rem; color: rgba(255,255,255,0.6); }

.hero-scroll-hint {
  position: absolute;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: .65rem;
  font-size: .75rem;
  color: rgba(255,255,255,0.5);
  letter-spacing: .15em;
  text-transform: uppercase;
}
.scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(180deg, rgba(255,255,255,0.5), transparent);
  position: relative;
  overflow: hidden;
}
.scroll-line::after {
  content: '';
  position: absolute; top: 0; left: 0; right: 0;
  height: 12px;
  background: #fff;
  animation: scroll-down 2s ease-in-out infinite;
}
@keyframes scroll-down {
  0% { transform: translateY(-12px); opacity: 0; }
  50% { opacity: 1; }
  100% { transform: translateY(40px); opacity: 0; }
}

/* ============= 通用 section ============= */
.section {
  padding: clamp(4rem, 8vw, 7rem) 0;
  position: relative;
}
.section-light { background: #fff; }
.section-dark {
  background: var(--grad-hero);
  color: #fff;
}
.section-gradient {
  background: linear-gradient(180deg, #F0F7FF 0%, #E0F0F0 100%);
  color: var(--c-text);
}
.section-head {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 3.5rem;
}
.section-eyebrow {
  font-size: .8rem;
  letter-spacing: .3em;
  color: var(--c-brand-2);
  font-weight: 600;
  margin-bottom: 1rem;
  text-transform: uppercase;
}
.section-head.light .section-eyebrow { color: #4DA6FF; }
.section-title {
  font-size: var(--fs-h2);
  font-weight: 800;
  letter-spacing: -.01em;
  line-height: 1.2;
  margin-bottom: 1.25rem;
}
.section-lead {
  font-size: var(--fs-lead);
  color: var(--c-text-2);
  line-height: 1.8;
}
/* 渐变背景 section(痛点/生态)用深色文字,与浅色底图形成对比 */
.section-gradient .section-lead { color: var(--c-text-2); }
/* 暗色 section(核心技术)用浅色文字 */
.section-dark .section-lead { color: rgba(255,255,255,0.78); }

/* 滚动浮现动效 - 默认可见,JS 启动后才隐藏并通过 IO 显示 */
.reveal {
  opacity: 1;
  transform: none;
  transition: opacity .8s ease, transform .8s ease;
}
.reveal.is-pending {
  opacity: 0;
  transform: translateY(30px);
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============= 时代趋势 ============= */
.trend-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}
.trend-card {
  padding: 2rem 1.75rem;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  background: #fff;
  transition: all .3s ease;
  position: relative;
  overflow: hidden;
}
.trend-card::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--grad-blue);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .4s ease;
}
.trend-card:hover {
  border-color: transparent;
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}
.trend-card:hover::before { transform: scaleX(1); }
.trend-num {
  font-size: 2.2rem;
  font-weight: 900;
  background: var(--grad-blue);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 1rem;
  letter-spacing: -.02em;
}
.trend-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: .75rem;
  color: var(--c-text);
}
.trend-card p {
  font-size: .92rem;
  color: var(--c-text-3);
  line-height: 1.7;
}

/* ============= 痛点 ============= */
.pain-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
  margin-bottom: 3rem;
}
.pain-card {
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,0.6);
  border-radius: var(--radius);
  padding: 2rem 1.75rem;
  transition: all .3s ease;
}
.pain-card:hover {
  background: #fff;
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}
.pain-icon {
  width: 56px; height: 56px;
  border-radius: 14px;
  background: linear-gradient(135deg, #EAF3FB 0%, #B0D0F0 100%);
  color: var(--c-brand-2);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 1.25rem;
}
.pain-icon svg { width: 28px; height: 28px; }
.pain-tag {
  font-size: .75rem;
  color: var(--c-brand-2);
  font-weight: 700;
  letter-spacing: .15em;
  margin-bottom: .35rem;
}
.pain-card h3 {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: .65rem;
  color: var(--c-text);
}
.pain-card p {
  font-size: .9rem;
  color: var(--c-text-3);
  line-height: 1.7;
}
.pain-conclusion {
  text-align: center;
  padding: 1.5rem 2rem;
  background: rgba(10,37,64,0.85);
  color: #fff;
  border-radius: var(--radius);
  font-size: 1.05rem;
  max-width: 720px;
  margin: 0 auto;
}
.pain-conclusion strong { color: #4DA6FF; }

/* ============= 产品 ============= */
.product-flow {
  margin-bottom: 4rem;
}
.flow-track {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: linear-gradient(135deg, #EAF3FB 0%, #fff 100%);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-lg);
  padding: 2rem 1.5rem;
  overflow-x: auto;
  scrollbar-width: thin;
}
.flow-item {
  display: flex; flex-direction: column;
  align-items: center;
  text-align: center;
  min-width: 76px;
  flex: 0 0 auto;
}
.flow-num {
  width: 44px; height: 44px;
  background: var(--grad-cta);
  color: #fff;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-weight: 800;
  font-size: .9rem;
  margin-bottom: .65rem;
  box-shadow: 0 6px 16px rgba(30,91,255,0.3);
}
.flow-text {
  font-size: .82rem;
  font-weight: 600;
  color: var(--c-text);
  white-space: nowrap;
}
.flow-line {
  flex: 1;
  height: 2px;
  background: linear-gradient(90deg, #4DA6FF, #B0D0F0);
  margin: 0 .35rem;
  min-width: 14px;
}

.product-features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}
.feature-card {
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 1.85rem 1.75rem;
  transition: all .3s ease;
  position: relative;
  overflow: hidden;
}
.feature-card::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 3px;
  background: var(--grad-blue);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .35s ease;
}
.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: transparent;
}
.feature-card:hover::after { transform: scaleX(1); }
.feature-icon {
  font-size: 2rem;
  margin-bottom: 1rem;
}
.feature-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: .65rem;
  color: var(--c-text);
}
.feature-card p {
  font-size: .9rem;
  color: var(--c-text-3);
  line-height: 1.7;
}

/* ============= 核心技术 ============= */
.section-dark .tech-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1.25rem;
}
.tech-card {
  padding: 1.65rem 1.35rem;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius);
  backdrop-filter: blur(8px);
  transition: all .3s ease;
}
.tech-card:hover {
  background: rgba(255,255,255,0.08);
  border-color: rgba(77,166,255,0.4);
  transform: translateY(-4px);
}
.tech-num {
  font-size: 1.35rem;
  font-weight: 900;
  color: #4DA6FF;
  margin-bottom: .85rem;
  letter-spacing: .04em;
}
.tech-card h3 {
  font-size: 1.02rem;
  font-weight: 700;
  margin-bottom: .55rem;
  color: #fff;
  line-height: 1.35;
}
.tech-card p {
  font-size: .85rem;
  color: rgba(255,255,255,0.7);
  line-height: 1.65;
}

/* ============= 核心优势 ============= */
.adv-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-bottom: 4rem;
}
.adv-card {
  padding: 2.25rem 2rem;
  border-radius: var(--radius-lg);
  background: #fff;
  border: 1px solid var(--c-line);
  position: relative;
  overflow: hidden;
  transition: all .3s ease;
}
.adv-card-1 {
  background: linear-gradient(160deg, #061A40 0%, #0F2E5C 100%);
  color: #fff;
  border-color: transparent;
}
.adv-card-2 {
  background: linear-gradient(160deg, #1E5BFF 0%, #2563EB 100%);
  color: #fff;
  border-color: transparent;
}
.adv-card-3 {
  background: linear-gradient(160deg, #EAF3FB 0%, #fff 100%);
  color: var(--c-text);
}
.adv-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}
.adv-num {
  display: inline-block;
  padding: .3rem .85rem;
  border-radius: 999px;
  background: rgba(255,255,255,0.18);
  font-size: .75rem;
  letter-spacing: .15em;
  margin-bottom: 1.5rem;
  font-weight: 600;
}
.adv-card-3 .adv-num {
  background: rgba(30,91,255,0.1);
  color: var(--c-brand-2);
}
.adv-card h3 {
  font-size: 1.4rem;
  font-weight: 800;
  margin-bottom: 1rem;
  letter-spacing: -.01em;
}
.adv-hl {
  font-size: 1.5rem;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 1rem;
  letter-spacing: -.01em;
}
.adv-card-1 .adv-hl { color: #4DA6FF; }
.adv-card-2 .adv-hl { color: #B0D0F0; }
.adv-card-3 .adv-hl { color: var(--c-brand-2); }
.adv-card p {
  font-size: .92rem;
  margin-bottom: 1.5rem;
  opacity: .9;
}
.adv-list {
  border-top: 1px solid rgba(255,255,255,0.15);
  padding-top: 1rem;
}
.adv-card-3 .adv-list { border-color: rgba(10,37,64,0.1); }
.adv-list li {
  font-size: .85rem;
  padding: .35rem 0;
  position: relative;
  padding-left: 1.4rem;
  opacity: .88;
}
.adv-list li::before {
  content: '✓';
  position: absolute; left: 0; top: .35rem;
  color: #4DA6FF;
  font-weight: 800;
}
.adv-card-3 .adv-list li::before { color: var(--c-brand-2); }

/* 成本对比 */
.cost-compare {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: stretch;
  gap: 1rem;
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
}
.cost-col {
  padding: 1.5rem;
  border-radius: var(--radius);
  text-align: center;
}
.cost-old {
  background: #F5F7FA;
  color: var(--c-text-3);
}
.cost-new {
  background: var(--grad-cta);
  color: #fff;
  box-shadow: 0 12px 30px rgba(30,91,255,0.3);
}
.cost-tag {
  font-size: .8rem;
  letter-spacing: .2em;
  font-weight: 700;
  margin-bottom: .65rem;
}
.cost-old .cost-tag { color: var(--c-text-3); }
.cost-new .cost-tag { color: #B0D0F0; }
.cost-title {
  font-size: .95rem;
  margin-bottom: 1rem;
  font-weight: 600;
}
.cost-num {
  font-size: 2.6rem;
  font-weight: 900;
  margin-bottom: 1rem;
  letter-spacing: -.02em;
}
.cost-num small { font-size: 1rem; font-weight: 500; }
.cost-col ul li {
  font-size: .85rem;
  padding: .25rem 0;
  opacity: .85;
}
.cost-vs {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--c-brand-2);
  padding: 0 1rem;
}

/* ============= 生态闭环 ============= */
.eco-cycle {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 4rem;
  padding: 2.5rem 1rem;
  background: rgba(255,255,255,0.7);
  backdrop-filter: blur(8px);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255,255,255,0.6);
}
.eco-step {
  text-align: center;
  padding: 1.25rem 1.1rem;
  background: #fff;
  border-radius: var(--radius);
  min-width: 130px;
  box-shadow: var(--shadow-sm);
  transition: all .3s ease;
}
.eco-step:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.eco-step-ai {
  background: var(--grad-cta);
  color: #fff;
}
.eco-step-ai h4 { color: #fff; }
.eco-icon { font-size: 1.85rem; margin-bottom: .5rem; }
.eco-step h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: .35rem;
}
.eco-step p { font-size: .78rem; color: var(--c-text-3); }
/* AI 反哺卡片用浅色文字(覆盖 .eco-step p 的深色) */
.eco-step.eco-step-ai p { color: rgba(255,255,255,0.85); }
.eco-arrow {
  font-size: 1.3rem;
  color: var(--c-brand-2);
  font-weight: 700;
}
.eco-arrow-back { color: var(--c-brand-2); }

.eco-targets {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
  margin-bottom: 3rem;
}
.target-card {
  padding: 2rem 1.75rem;
  background: rgba(255,255,255,0.8);
  border: 1px solid rgba(255,255,255,0.6);
  border-radius: var(--radius);
  text-align: center;
  transition: all .3s ease;
}
.target-card:hover {
  background: #fff;
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.target-hot {
  background: linear-gradient(160deg, rgba(30,91,255,0.12) 0%, rgba(10,37,64,0.04) 100%);
  border: 1px solid rgba(30,91,255,0.3);
  position: relative;
}
.target-hot::before {
  content: '重点';
  position: absolute;
  top: 1rem; right: 1rem;
  background: var(--c-brand-2);
  color: #fff;
  font-size: .7rem;
  padding: .15rem .55rem;
  border-radius: 999px;
  font-weight: 700;
  letter-spacing: .05em;
}
.target-phase {
  font-size: .8rem;
  color: var(--c-brand-2);
  font-weight: 700;
  letter-spacing: .2em;
  margin-bottom: .5rem;
}
.target-num {
  font-size: 3rem;
  font-weight: 900;
  background: var(--grad-blue);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -.02em;
  line-height: 1;
}
.target-unit {
  font-size: .85rem;
  color: var(--c-text-3);
  margin-bottom: 1rem;
}
.target-card p { font-size: .88rem; color: var(--c-text-3); line-height: 1.6; }

.eco-quote {
  text-align: center;
  max-width: 720px;
  margin: 0 auto;
  padding: 2.5rem 2rem;
  background: rgba(10,37,64,0.85);
  color: #fff;
  border-radius: var(--radius-lg);
  font-size: 1.1rem;
  line-height: 1.9;
}
.eco-quote strong { color: #4DA6FF; }

/* ============= 联系 + 公司 ============= */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}
.contact-list {
  margin: 2rem 0 2.5rem;
}
.contact-list li {
  display: flex;
  gap: 1rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--c-line);
}
.contact-list li:last-child { border-bottom: 0; }
.contact-icon {
  flex: 0 0 40px;
  width: 40px; height: 40px;
  background: linear-gradient(135deg, #EAF3FB 0%, #B0D0F0 100%);
  color: var(--c-brand-2);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem;
}
.contact-label {
  font-size: .8rem;
  color: var(--c-text-3);
  margin-bottom: .25rem;
  letter-spacing: .05em;
}
.contact-value {
  font-size: 1rem;
  font-weight: 600;
  color: var(--c-text);
}
.contact-value a { color: var(--c-brand-2); }
.contact-value a:hover { text-decoration: underline; }

.contact-card {
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: var(--radius-lg);
  padding: 2.25rem 2rem;
  box-shadow: var(--shadow-md);
}
.contact-card h3 {
  font-size: 1.4rem;
  font-weight: 800;
  margin-bottom: .5rem;
}
.contact-card-lead {
  font-size: .9rem;
  color: var(--c-text-3);
  margin-bottom: 1.5rem;
}
.contact-form { display: flex; flex-direction: column; gap: 1rem; }
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
.contact-form label {
  display: flex;
  flex-direction: column;
  gap: .35rem;
}
.contact-form span {
  font-size: .82rem;
  font-weight: 600;
  color: var(--c-text-2);
}
.contact-form input,
.contact-form select,
.contact-form textarea {
  padding: .8rem 1rem;
  border: 1px solid var(--c-line);
  border-radius: 10px;
  font: inherit;
  background: #F8FAFC;
  color: var(--c-text);
  transition: all .2s;
}
.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--c-brand-2);
  background: #fff;
  box-shadow: 0 0 0 3px rgba(30,91,255,0.12);
}
.contact-form textarea { resize: vertical; min-height: 80px; }
.form-feedback {
  font-size: .85rem;
  text-align: center;
  margin-top: .5rem;
  min-height: 1.4em;
}
.form-feedback.success { color: #16A34A; }
.form-feedback.error { color: #DC2626; }

/* ============= 页脚 ============= */
.footer {
  background: var(--c-deep-1);
  color: rgba(255,255,255,0.7);
  padding: 4rem 0 0;
}
.footer-inner {
  display: grid;
  grid-template-columns: 1.5fr 2fr;
  gap: 3rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer-brand { max-width: 360px; }
.footer-logo { height: 56px; width: auto; margin-bottom: 1.25rem; }
.footer-brand p { font-size: .9rem; line-height: 1.7; }
.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}
.footer-col h5 {
  color: #fff;
  font-size: .9rem;
  font-weight: 700;
  margin-bottom: 1rem;
  letter-spacing: .05em;
}
.footer-col a {
  display: block;
  font-size: .85rem;
  padding: .35rem 0;
  transition: color .2s;
}
.footer-col a:hover { color: #4DA6FF; }
.footer-bottom {
  padding: 1.5rem 0;
  font-size: .8rem;
  color: rgba(255,255,255,0.5);
}
.footer-bottom a { color: rgba(255,255,255,0.5); transition: color .2s; }
.footer-bottom a:hover { color: #4DA6FF; }
.footer-bottom .container {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

/* ============= 响应式 ============= */
@media (max-width: 1100px) {
  .section-dark .tech-grid { grid-template-columns: repeat(3, 1fr); }
  .section-dark .tech-grid .tech-card:nth-child(4),
  .section-dark .tech-grid .tech-card:nth-child(5) { grid-column: span 1; }
}

@media (max-width: 960px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-visual { height: 360px; margin-top: 2rem; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; }
  .footer-cols { grid-template-columns: repeat(3, 1fr); }
  .cost-compare { grid-template-columns: 1fr; }
  .cost-vs { transform: rotate(90deg); padding: .5rem 0; }
  .nav-links {
    position: fixed;
    top: 0; right: 0;
    height: 100vh;
    width: 80%;
    max-width: 320px;
    background: var(--c-deep-1);
    flex-direction: column;
    align-items: flex-start;
    padding: 6rem 2rem 2rem;
    gap: 1.25rem;
    transform: translateX(100%);
    transition: transform .35s ease;
    box-shadow: -10px 0 30px rgba(0,0,0,0.3);
  }
  .nav-links.is-open { transform: translateX(0); }
  .nav-links a { font-size: 1rem; color: #fff !important; }
  .nav-cta { display: none; }
  .nav-toggle { display: flex; }
}

@media (max-width: 640px) {
  .hero { padding-top: 6rem; min-height: auto; }
  .hero-visual { height: 320px; }
  .hero-card-main { padding: 1.25rem 1.4rem; }
  .card-steps { grid-template-columns: 1fr; gap: .5rem; }
  .flow-track { padding: 1.5rem 1rem; gap: .25rem; }
  .form-row { grid-template-columns: 1fr; }
  .footer-cols { grid-template-columns: 1fr 1fr; }
  .section { padding: 3.5rem 0; }
  .nav-cta, .logo-text { display: none; }
  .nav.is-scrolled .nav-cta { display: inline-flex; }
  .section-dark .tech-grid { grid-template-columns: repeat(2, 1fr); }
}