/* ============================================================
   湖南健智安官网 - 全站样式
   主色：安全深蓝  辅助：科技青  强调：安全绿 / 活力橙
   ============================================================ */

:root {
  /* 配色 */
  --navy-900: #0A1F3A;
  --navy-800: #0F2A4A;
  --navy-700: #1A365D;
  --navy-600: #24497a;
  --cyan: #0EA5E9;
  --cyan-light: #38bdf8;
  --green: #10B981;
  --green-light: #34d399;
  --orange: #F97316;
  --indigo: #6366F1;
  --pink: #EC4899;

  --ink: #0F172A;
  --ink-2: #1F2937;
  --muted: #6B7280;
  --line: #E5E7EB;
  --bg: #FFFFFF;
  --bg-soft: #F6F8FB;
  --bg-mute: #EEF2F7;

  /* 字号 */
  --fs-xs: 13px;
  --fs-sm: 14px;
  --fs-base: 15px;
  --fs-lg: 17px;
  --fs-xl: 20px;
  --fs-2xl: 24px;
  --fs-3xl: 30px;
  --fs-4xl: 40px;
  --fs-5xl: 56px;

  /* 圆角 / 阴影 */
  --r-sm: 8px;
  --r-md: 14px;
  --r-lg: 20px;
  --r-xl: 28px;
  --shadow-sm: 0 2px 8px rgba(15, 42, 74, .06);
  --shadow-md: 0 8px 24px rgba(15, 42, 74, .08);
  --shadow-lg: 0 18px 48px rgba(15, 42, 74, .14);

  /* 容器 */
  --container: 1180px;
  --nav-h: 70px;

  /* 动效 */
  --ease: cubic-bezier(.4, 0, .2, 1);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  font-size: var(--fs-base);
  line-height: 1.7;
  color: var(--ink-2);
  background: var(--bg);
  overflow-x: hidden;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input, select, textarea { font-family: inherit; font-size: inherit; }

::selection { background: rgba(14, 165, 233, .2); color: var(--navy-800); }

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

/* ========== 通用组件 ========== */

.section {
  padding: 96px 0;
  position: relative;
}
.section--muted { background: var(--bg-soft); }
.section--dark {
  background: linear-gradient(160deg, var(--navy-800) 0%, var(--navy-900) 100%);
  color: #e6eef8;
}

.section__head {
  max-width: 760px;
  margin-bottom: 56px;
}
.section__head--center { text-align: center; margin-left: auto; margin-right: auto; }
.section__tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: var(--fs-xs);
  letter-spacing: .12em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--cyan);
  margin-bottom: 16px;
}
.section__tag::before {
  content: "";
  width: 28px; height: 2px;
  background: var(--cyan);
  border-radius: 2px;
}
.section__tag--light { color: var(--cyan-light); }
.section__tag--light::before { background: var(--cyan-light); }

.section__title {
  font-size: var(--fs-4xl);
  font-weight: 900;
  color: var(--navy-800);
  letter-spacing: -.02em;
  line-height: 1.2;
  margin-bottom: 16px;
}
.section--dark .section__title { color: #fff; }
.section__lead {
  font-size: var(--fs-lg);
  color: var(--muted);
  max-width: 720px;
}
.section--dark .section__lead { color: #a9bdd6; }
.section__lead strong { color: var(--navy-800); font-weight: 700; }
.section--dark .section__lead strong { color: var(--cyan-light); }

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 28px;
  font-size: var(--fs-sm);
  font-weight: 600;
  border-radius: 999px;
  transition: all .3s var(--ease);
  white-space: nowrap;
}
.btn--primary {
  background: linear-gradient(135deg, var(--cyan) 0%, var(--indigo) 100%);
  color: #fff;
  box-shadow: 0 10px 24px rgba(14, 165, 233, .32);
}
.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 32px rgba(14, 165, 233, .42);
}
.btn--ghost {
  background: rgba(255, 255, 255, .08);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, .22);
  backdrop-filter: blur(8px);
}
.btn--ghost:hover {
  background: rgba(255, 255, 255, .16);
  border-color: rgba(255, 255, 255, .4);
}
.btn--block { width: 100%; padding: 15px; font-size: var(--fs-base); }

/* ========== 导航 ========== */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--nav-h);
  background: rgba(255, 255, 255, .72);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid rgba(15, 42, 74, .06);
  transition: all .3s var(--ease);
}
.nav.is-scrolled {
  box-shadow: var(--shadow-sm);
}
.nav__inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav__brand {
  display: flex;
  align-items: center;
  gap: 10px;
}
.nav__logo { height: 42px; width: auto; flex-shrink: 0; object-fit: contain; }
.nav__brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.nav__brand-text strong {
  font-size: 17px;
  font-weight: 900;
  color: var(--navy-800);
  letter-spacing: .02em;
}
.nav__brand-text small {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: .18em;
  color: var(--cyan);
  font-family: "Sora", sans-serif;
}
.nav__menu {
  display: flex;
  align-items: center;
  gap: 6px;
}
.nav__link {
  padding: 8px 16px;
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--ink-2);
  border-radius: 8px;
  transition: all .2s var(--ease);
  position: relative;
}
.nav__link:hover { color: var(--cyan); }
.nav__link.is-active { color: var(--navy-800); font-weight: 700; }
.nav__link.is-active::after {
  content: "";
  position: absolute;
  bottom: -2px; left: 50%;
  transform: translateX(-50%);
  width: 20px; height: 3px;
  background: linear-gradient(90deg, var(--cyan), var(--indigo));
  border-radius: 2px;
}
.nav__link--cta {
  margin-left: 12px;
  background: linear-gradient(135deg, var(--cyan), var(--indigo));
  color: #fff !important;
  padding: 9px 20px;
  border-radius: 999px;
  font-weight: 600;
  box-shadow: 0 6px 16px rgba(14, 165, 233, .28);
}
.nav__link--cta:hover { transform: translateY(-1px); box-shadow: 0 10px 22px rgba(14, 165, 233, .38); }
.nav__link--cta::after { display: none; }

.nav__toggle {
  display: none;
  width: 42px; height: 42px;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
}
.nav__toggle span {
  width: 22px; height: 2px;
  background: var(--navy-800);
  border-radius: 2px;
  transition: all .3s var(--ease);
}
.nav__toggle.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__toggle.is-open span:nth-child(2) { opacity: 0; }
.nav__toggle.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.nav__mask {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(10, 31, 58, .5);
  backdrop-filter: blur(2px);
  z-index: 99;
  opacity: 0;
  /* 未显示时必须放行指针事件，否则移动端透明遮罩会拦截全页点击（Tabs/表单/悬浮按钮） */
  pointer-events: none;
  transition: opacity .3s var(--ease);
}
.nav__mask.is-show {
  opacity: 1;
  pointer-events: auto;
}

/* ========== Hero ========== */
.hero {
  position: relative;
  min-height: 100vh;
  padding-top: var(--nav-h);
  display: flex;
  align-items: center;
  overflow: hidden;
  background: linear-gradient(135deg, #0A1F3A 0%, #0F2A4A 45%, #1A365D 100%);
  color: #fff;
}
.hero__bg { position: absolute; inset: 0; overflow: hidden; pointer-events: none; }
.hero__mesh {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 80% 30%, rgba(14, 165, 233, .28), transparent 60%),
    radial-gradient(ellipse 50% 45% at 20% 80%, rgba(16, 185, 129, .18), transparent 60%),
    radial-gradient(ellipse 40% 40% at 60% 60%, rgba(99, 102, 241, .16), transparent 60%);
}
.hero__grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 70% 70% at 50% 50%, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 70% 70% at 50% 50%, #000 30%, transparent 75%);
}
.hero__orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  opacity: .5;
  animation: float 9s ease-in-out infinite;
}
.hero__orb--1 { width: 360px; height: 360px; background: var(--cyan); top: 10%; right: 5%; }
.hero__orb--2 { width: 280px; height: 280px; background: var(--green); bottom: 5%; left: 8%; animation-delay: -4s; }

@keyframes float {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(20px, -28px); }
}

.hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  gap: 60px;
  align-items: center;
  padding-top: 40px;
  padding-bottom: 60px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 18px;
  background: rgba(14, 165, 233, .12);
  border: 1px solid rgba(14, 165, 233, .3);
  border-radius: 999px;
  font-size: var(--fs-xs);
  font-weight: 600;
  color: var(--cyan-light);
  letter-spacing: .04em;
  margin-bottom: 28px;
}
.eyebrow__dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 4px rgba(16, 185, 129, .25);
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 4px rgba(16, 185, 129, .25); }
  50% { box-shadow: 0 0 0 8px rgba(16, 185, 129, .1); }
}

.hero__title {
  font-size: var(--fs-5xl);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -.02em;
  margin-bottom: 24px;
}
.hero__title em {
  font-style: normal;
  color: #cfe3f7;
  font-weight: 300;
}
.hero__grad {
  background: linear-gradient(120deg, var(--cyan-light), var(--green-light));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-weight: 900;
}

.hero__sub {
  font-size: var(--fs-lg);
  color: #a9bdd6;
  max-width: 560px;
  margin-bottom: 36px;
  line-height: 1.7;
}

.hero__cta {
  display: flex;
  gap: 16px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.hero__badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.hero__badges li {
  padding: 6px 14px;
  background: rgba(255, 255, 255, .06);
  border: 1px solid rgba(255, 255, 255, .1);
  border-radius: 999px;
  font-size: var(--fs-xs);
  color: #cfe3f7;
}

/* Hero 右侧可视化卡片 */
.hero__visual {
  position: relative;
  height: 460px;
}
.hero__card {
  position: absolute;
  background: rgba(255, 255, 255, .96);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}
.hero__card--main {
  width: 100%;
  max-width: 380px;
  right: 0; top: 40px;
  animation: cardFloat 6s ease-in-out infinite;
}
@keyframes cardFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}
.hero__card-head {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 12px 18px;
  background: var(--bg-soft);
  border-bottom: 1px solid var(--line);
}
.hero__dot { width: 10px; height: 10px; border-radius: 50%; }
.hero__dot--r { background: #ff5f57; }
.hero__dot--y { background: #febc2e; }
.hero__dot--g { background: #28c840; }
.hero__card-title {
  margin-left: 8px;
  font-size: var(--fs-sm);
  font-weight: 700;
  color: var(--navy-800);
}
.hero__card-body { padding: 20px; }
.hero__row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: var(--fs-sm);
  color: var(--muted);
  margin-bottom: 4px;
}
.hero__row b {
  font-family: "Sora", sans-serif;
  font-size: var(--fs-xl);
  font-weight: 800;
  color: var(--navy-800);
}
.hero__bar {
  height: 8px;
  background: var(--bg-mute);
  border-radius: 4px;
  margin-bottom: 16px;
  overflow: hidden;
}
.hero__bar i {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--cyan), var(--indigo));
  border-radius: 4px;
  animation: barGrow 1.4s var(--ease) both;
}
.hero__bar--green i { background: linear-gradient(90deg, var(--green), var(--green-light)); }
@keyframes barGrow { from { width: 0 !important; } }

.hero__chip {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 18px;
  background: rgba(255, 255, 255, .95);
  border-radius: 999px;
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--navy-800);
  box-shadow: var(--shadow-md);
}
.hero__chip--1 { top: 0; left: 10px; color: var(--orange); animation: chipFloat 5s ease-in-out infinite; }
.hero__chip--2 { top: 180px; left: -20px; color: var(--green); animation: chipFloat 5s ease-in-out infinite -1.5s; }
.hero__chip--3 { bottom: 30px; right: 10px; color: var(--cyan); animation: chipFloat 5s ease-in-out infinite -3s; }
@keyframes chipFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.hero__scroll {
  position: absolute;
  bottom: 28px; left: 50%;
  transform: translateX(-50%);
  width: 28px; height: 46px;
  border: 2px solid rgba(255,255,255,.3);
  border-radius: 14px;
  z-index: 2;
}
.hero__scroll span {
  position: absolute;
  top: 8px; left: 50%;
  width: 4px; height: 8px;
  background: #fff;
  border-radius: 2px;
  transform: translateX(-50%);
  animation: scrollDot 1.6s ease-in-out infinite;
}
@keyframes scrollDot {
  0% { opacity: 0; transform: translate(-50%, 0); }
  50% { opacity: 1; }
  100% { opacity: 0; transform: translate(-50%, 14px); }
}

/* ========== 关于我们 卡片 ========== */
.about__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}
.about__intro {
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  gap: 48px;
  align-items: center;
  margin-bottom: 56px;
}
.about__intro-text .section__title { margin-bottom: 18px; }
.about__intro-img {
  position: relative;
  border-radius: var(--r-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.about__intro-img::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(14,165,233,.12), transparent 60%);
  pointer-events: none;
}
.about__intro-img img {
  width: 100%;
  height: 320px;
  object-fit: cover;
  display: block;
  transition: transform .6s var(--ease);
}
.about__intro-img:hover img { transform: scale(1.04); }
.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 30px 26px;
  transition: all .35s var(--ease);
  position: relative;
  overflow: hidden;
}
.card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--c, var(--cyan));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .35s var(--ease);
}
.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}
.card:hover::before { transform: scaleX(1); }
.card__icon {
  width: 54px; height: 54px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: color-mix(in srgb, var(--c, var(--cyan)) 12%, transparent);
  color: var(--c, var(--cyan));
  margin-bottom: 20px;
}
.card h3 {
  font-size: var(--fs-lg);
  font-weight: 700;
  color: var(--navy-800);
  margin-bottom: 10px;
}
.card p { color: var(--muted); font-size: var(--fs-sm); line-height: 1.7; }

/* ========== AI+培训服务系统 能力矩阵 ========== */
.platform__matrix {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.platform__hero {
  position: relative;
  margin-bottom: 48px;
  border-radius: var(--r-lg);
  overflow: hidden;
  box-shadow: 0 24px 60px rgba(0, 0, 0, .35);
}
.platform__hero img {
  width: 100%;
  height: auto;
  display: block;
}
.platform__hero-caption {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  padding: 16px 28px;
  background: linear-gradient(transparent, rgba(10, 31, 58, .85));
  color: #cfe3f7;
  font-size: var(--fs-sm);
  font-weight: 500;
  letter-spacing: .04em;
}
.matrix {
  background: rgba(255, 255, 255, .04);
  border: 1px solid rgba(255, 255, 255, .1);
  border-radius: var(--r-md);
  padding: 28px;
  transition: all .3s var(--ease);
}
.matrix:hover {
  background: rgba(255, 255, 255, .08);
  border-color: rgba(14, 165, 233, .4);
  transform: translateY(-4px);
}
.matrix__head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 14px;
}
.matrix__num {
  font-family: "Sora", sans-serif;
  font-size: var(--fs-xl);
  font-weight: 800;
  color: var(--cyan-light);
  opacity: .6;
}
.matrix h3 { font-size: var(--fs-lg); font-weight: 700; color: #fff; }
.matrix p { color: #a9bdd6; font-size: var(--fs-sm); line-height: 1.7; }
.matrix--wide { grid-column: span 1; }
.matrix__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.matrix__tags span {
  padding: 6px 12px;
  background: rgba(14, 165, 233, .12);
  border: 1px solid rgba(14, 165, 233, .3);
  border-radius: 999px;
  font-size: 12px;
  color: var(--cyan-light);
}

/* ========== 亮点 Tabs ========== */
.tabs { }
.tabs__nav {
  display: flex;
  gap: 8px;
  margin-bottom: 32px;
  border-bottom: 2px solid var(--line);
  overflow-x: auto;
  scrollbar-width: none;
}
.tabs__nav::-webkit-scrollbar { display: none; }
.tabs__btn {
  padding: 14px 22px;
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--muted);
  white-space: nowrap;
  position: relative;
  transition: color .2s var(--ease);
}
.tabs__btn:hover { color: var(--navy-800); }
.tabs__btn.is-active { color: var(--navy-800); }
.tabs__btn.is-active::after {
  content: "";
  position: absolute;
  bottom: -2px; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan), var(--indigo));
  border-radius: 3px 3px 0 0;
}
.tabs__panel {
  display: none;
  animation: fadeUp .4s var(--ease);
}
.tabs__panel.is-active { display: block; }
.tabs__panel h3 {
  font-size: var(--fs-xl);
  font-weight: 800;
  color: var(--navy-800);
  margin-bottom: 24px;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

.feat-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
.feat-list li {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 20px;
  align-items: start;
  padding: 18px 22px;
  background: var(--bg-soft);
  border-radius: var(--r-sm);
  border-left: 3px solid var(--cyan);
}
.feat-list b {
  font-weight: 700;
  color: var(--navy-800);
  font-size: var(--fs-sm);
}
.feat-list span { color: var(--muted); font-size: var(--fs-sm); }
.feat-list--grid {
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}
.feat-list--grid li {
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 18px 20px;
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.chip {
  padding: 8px 16px;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: var(--fs-sm);
  color: var(--navy-700);
  font-weight: 500;
}
.chip-row--green .chip {
  background: rgba(16, 185, 129, .08);
  border-color: rgba(16, 185, 129, .25);
  color: #047857;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}
.form-col h4 {
  font-size: var(--fs-base);
  font-weight: 700;
  color: var(--navy-800);
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.effect-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.effect-card {
  padding: 28px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  transition: all .3s var(--ease);
}
.effect-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: transparent;
}
.effect-card__icon {
  width: 48px; height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: color-mix(in srgb, var(--c) 12%, transparent);
  color: var(--c);
  margin-bottom: 16px;
}
.effect-card h4 {
  font-size: var(--fs-base);
  font-weight: 700;
  color: var(--navy-800);
  margin-bottom: 8px;
}
.effect-card p { color: var(--muted); font-size: var(--fs-sm); }

/* ========== 解决方案 ========== */
.sol__block { margin-bottom: 56px; }
.sol__block:last-child { margin-bottom: 0; }
.sol__banner {
  margin-bottom: 48px;
  border-radius: var(--r-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}
.sol__banner img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform .6s var(--ease);
}
.sol__banner:hover img { transform: scale(1.02); }
.sol__subtitle {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: var(--fs-xl);
  font-weight: 800;
  color: var(--navy-800);
  margin-bottom: 24px;
}
.sol__bar {
  width: 4px; height: 22px;
  background: linear-gradient(180deg, var(--cyan), var(--indigo));
  border-radius: 2px;
}

.industry-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.industry {
  padding: 28px 24px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  transition: all .3s var(--ease);
  text-align: center;
}
.industry:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
  border-color: transparent;
}
.industry__icon {
  width: 64px; height: 64px;
  margin: 0 auto 16px;
  border-radius: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: color-mix(in srgb, var(--c) 12%, transparent);
  color: var(--c);
  transition: transform .3s var(--ease);
}
.industry:hover .industry__icon { transform: scale(1.08) rotate(-4deg); }
.industry h4 {
  font-size: var(--fs-lg);
  font-weight: 700;
  color: var(--navy-800);
  margin-bottom: 6px;
}
.industry p { color: var(--muted); font-size: var(--fs-sm); }

.audience-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.audience {
  padding: 20px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  text-align: center;
  font-weight: 600;
  color: var(--navy-800);
  transition: all .25s var(--ease);
}
.audience:hover {
  background: linear-gradient(135deg, rgba(14,165,233,.08), rgba(99,102,241,.08));
  border-color: var(--cyan);
  color: var(--navy-800);
}
.audience--wide { grid-column: span 1; }

.mode-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.mode {
  padding: 28px;
  border-radius: var(--r-md);
  position: relative;
  overflow: hidden;
}
.mode--online {
  background: linear-gradient(135deg, rgba(14, 165, 233, .08), rgba(99, 102, 241, .06));
  border: 1px solid rgba(14, 165, 233, .25);
}
.mode--offline {
  background: linear-gradient(135deg, rgba(16, 185, 129, .08), rgba(249, 115, 22, .05));
  border: 1px solid rgba(16, 185, 129, .25);
}
.mode__label {
  display: inline-block;
  padding: 5px 14px;
  border-radius: 999px;
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: .06em;
  margin-bottom: 18px;
}
.mode--online .mode__label { background: var(--cyan); color: #fff; }
.mode--offline .mode__label { background: var(--green); color: #fff; }
.mode ul { display: flex; flex-wrap: wrap; gap: 10px; }
.mode li {
  padding: 8px 16px;
  background: #fff;
  border-radius: 999px;
  font-size: var(--fs-sm);
  color: var(--navy-700);
  font-weight: 500;
  box-shadow: var(--shadow-sm);
}
.mode__visual {
  margin-top: 24px;
  position: relative;
  border-radius: var(--r-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.mode__visual img {
  width: 100%;
  height: 320px;
  object-fit: cover;
  display: block;
  transition: transform .6s var(--ease);
}
.mode__visual:hover img { transform: scale(1.04); }
.mode__visual-overlay {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  padding: 20px 28px;
  background: linear-gradient(transparent, rgba(10, 31, 58, .82));
  color: #fff;
  font-size: var(--fs-base);
  font-weight: 600;
}

/* ========== 核心数据 ========== */
.stats {
  background: linear-gradient(135deg, var(--navy-800), var(--navy-900));
  color: #fff;
  padding: 72px 0;
  position: relative;
  overflow: hidden;
}
.stats__bg {
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse 50% 80% at 20% 50%, rgba(14,165,233,.15), transparent 60%),
    radial-gradient(ellipse 50% 80% at 80% 50%, rgba(16,185,129,.12), transparent 60%);
}
.stats__inner {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}
.stat {
  padding: 20px;
}
.stat__num {
  font-family: "Sora", sans-serif;
  font-size: 64px;
  font-weight: 800;
  line-height: 1;
  background: linear-gradient(120deg, var(--cyan-light), var(--green-light));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  display: inline-block;
}
.stat__plus {
  font-family: "Sora", sans-serif;
  font-size: 40px;
  font-weight: 800;
  color: var(--cyan-light);
}
.stat__label {
  margin-top: 12px;
  font-size: var(--fs-sm);
  color: #a9bdd6;
}

/* ========== 联系我们 ========== */
.contact__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}
.contact__form {
  max-width: 720px;
  margin: 0 auto;
  width: 100%;
}
.contact__info {
  background: linear-gradient(160deg, var(--navy-800), var(--navy-900));
  color: #fff;
  border-radius: var(--r-lg);
  padding: 40px;
}
.contact__info h3 {
  font-size: var(--fs-2xl);
  font-weight: 800;
  margin-bottom: 28px;
}
.contact__list { display: flex; flex-direction: column; gap: 22px; margin-bottom: 32px; }
.contact__list li {
  display: flex;
  align-items: flex-start;
  gap: 16px;
}
.contact__ico {
  width: 40px; height: 40px;
  flex-shrink: 0;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(14, 165, 233, .15);
  color: var(--cyan-light);
}
.contact__list b {
  display: block;
  font-size: var(--fs-sm);
  color: #a9bdd6;
  margin-bottom: 2px;
}
.contact__list span {
  font-size: var(--fs-base);
  color: #fff;
  font-weight: 500;
}
.contact__qr {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 20px;
  background: rgba(255, 255, 255, .06);
  border-radius: var(--r-md);
}
.qr {
  width: 88px; height: 88px;
  flex-shrink: 0;
  border-radius: 8px;
  overflow: hidden;
  background: #fff;
  padding: 4px;
}
.qr svg { width: 100%; height: 100%; }
.contact__qr b { display: block; font-size: var(--fs-base); margin-bottom: 4px; }
.contact__qr small { color: #a9bdd6; font-size: var(--fs-xs); }

.contact__form {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 40px;
  box-shadow: var(--shadow-md);
}
.contact__form h3 {
  font-size: var(--fs-2xl);
  font-weight: 800;
  color: var(--navy-800);
  margin-bottom: 8px;
}
.form__intro {
  font-size: var(--fs-sm);
  color: var(--muted);
  margin-bottom: 24px;
}
.field { margin-bottom: 20px; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.field label {
  display: block;
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--ink-2);
  margin-bottom: 8px;
}
.field label i { color: #ef4444; font-style: normal; margin-left: 2px; }
.field input,
.field select,
.field textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: #fff;
  color: var(--ink);
  transition: all .2s var(--ease);
  outline: none;
}
.field input:focus,
.field select:focus,
.field textarea:focus {
  border-color: var(--cyan);
  box-shadow: 0 0 0 3px rgba(14, 165, 233, .12);
}
.field input.is-error,
.field select.is-error {
  border-color: #ef4444;
  box-shadow: 0 0 0 3px rgba(239, 68, 68, .12);
}
.field textarea { resize: vertical; min-height: 100px; }
.field__err {
  display: block;
  min-height: 18px;
  font-size: 12px;
  color: #ef4444;
  margin-top: 4px;
}
.radio-row { display: flex; flex-wrap: wrap; gap: 12px; }
.radio {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  cursor: pointer;
  font-size: var(--fs-sm);
  color: var(--ink-2);
  transition: all .2s var(--ease);
}
.radio input { display: none; }
.radio span { transition: color .2s; }
.radio:has(input:checked) {
  border-color: var(--cyan);
  background: rgba(14, 165, 233, .08);
  color: var(--navy-800);
  font-weight: 600;
}
.form__tip {
  margin-top: 14px;
  font-size: 12px;
  color: var(--muted);
  text-align: center;
}

/* ========== Footer ========== */
.footer {
  background: var(--navy-900);
  color: #a9bdd6;
}
.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 48px 24px;
  gap: 32px;
  flex-wrap: wrap;
}
.footer__brand {
  display: flex;
  align-items: center;
  gap: 14px;
}
.footer__logo { height: 56px; width: auto; object-fit: contain; }
.footer__links { display: flex; gap: 28px; flex-wrap: wrap; }
.footer__links a {
  font-size: var(--fs-sm);
  color: #a9bdd6;
  transition: color .2s;
}
.footer__links a:hover { color: var(--cyan-light); }
.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, .08);
  padding: 20px 0;
}
.footer__bottom .container {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 12px;
  color: #7a92ad;
}
.footer__bottom a { color: #a9bdd6; transition: color .2s; }
.footer__bottom a:hover { color: var(--cyan-light); }
.footer__bottom p span { margin: 0 6px; }

/* ========== 浮动咨询按钮 ========== */
.fab {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 90;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 12px 20px;
  background: linear-gradient(135deg, var(--cyan), var(--indigo));
  color: #fff;
  border-radius: 999px;
  font-weight: 600;
  font-size: var(--fs-sm);
  box-shadow: 0 12px 28px rgba(14, 165, 233, .4);
  transition: all .3s var(--ease);
}
.fab:hover { transform: translateY(-3px) scale(1.03); box-shadow: 0 16px 36px rgba(14, 165, 233, .5); }

/* ========== Toast ========== */
.toast {
  position: fixed;
  top: 90px;
  left: 50%;
  transform: translateX(-50%) translateY(-20px);
  padding: 12px 24px;
  background: var(--navy-800);
  color: #fff;
  border-radius: 999px;
  font-size: var(--fs-sm);
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  pointer-events: none;
  transition: all .35s var(--ease);
  z-index: 200;
}
.toast.is-show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}
.toast.is-success { background: var(--green); }
.toast.is-error { background: #ef4444; }

/* ========== 滚动渐显动画 ========== */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity .7s var(--ease), transform .7s var(--ease);
  transition-delay: var(--d, 0s);
}
.reveal.is-show {
  opacity: 1;
  transform: translateY(0);
}

/* ========== 响应式 ========== */
/* 桌面 ≥1024px 默认样式 */

/* 平板 768 ~ 1023px */
@media (max-width: 1023px) {
  :root {
    --fs-4xl: 34px;
    --fs-5xl: 44px;
  }
  .section { padding: 72px 0; }
  .about__intro { grid-template-columns: 1fr; gap: 32px; margin-bottom: 44px; }
  .about__intro-img img { height: 280px; }
  .about__grid { grid-template-columns: repeat(2, 1fr); }
  .platform__matrix { grid-template-columns: repeat(2, 1fr); }
  .industry-grid { grid-template-columns: repeat(2, 1fr); }
  .audience-grid { grid-template-columns: repeat(2, 1fr); }
  .effect-grid { grid-template-columns: 1fr; }
  .stats__inner { grid-template-columns: repeat(2, 1fr); gap: 32px; }
  .stat__num { font-size: 52px; }
  .contact__grid { grid-template-columns: 1fr; }
}

/* 移动 <768px */
@media (max-width: 767px) {
  :root {
    --fs-3xl: 24px;
    --fs-4xl: 28px;
    --fs-5xl: 34px;
  }
  .container { padding: 0 18px; }
  .section { padding: 60px 0; }
  .section__head { margin-bottom: 36px; }

  /* 导航 */
  .nav__menu {
    position: fixed;
    top: 0; right: 0;
    width: 78%;
    max-width: 300px;
    height: 100vh;
    background: #fff;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: calc(var(--nav-h) + 16px) 20px 32px;
    box-shadow: -8px 0 32px rgba(15, 42, 74, .16);
    transform: translateX(100%);
    transition: transform .35s var(--ease);
    overflow-y: auto;
  }
  .nav__menu.is-open { transform: translateX(0); }
  .nav__mask { display: block; }
  .nav__mask.is-show { display: block; }
  .nav__toggle { display: flex; }
  .nav__link {
    padding: 14px 16px;
    font-size: var(--fs-base);
    border-radius: 10px;
  }
  .nav__link.is-active { background: rgba(14, 165, 233, .08); }
  .nav__link.is-active::after { display: none; }
  .nav__link--cta {
    margin: 12px 0 0;
    text-align: center;
    justify-content: center;
  }

  /* Hero */
  .hero { min-height: auto; padding: calc(var(--nav-h) + 24px) 0 60px; }
  .hero__inner { grid-template-columns: 1fr; gap: 40px; padding-top: 0; }
  .hero__visual { height: 320px; max-width: 360px; margin: 0 auto; }
  .hero__cta { gap: 12px; }
  .hero__cta .btn { flex: 1; }
  .hero__scroll { display: none; }

  /* 卡片网格 */
  .about__intro { gap: 24px; margin-bottom: 36px; }
  .about__intro-img img { height: 220px; }
  .about__grid { grid-template-columns: 1fr; }
  .platform__hero-caption { padding: 12px 18px; font-size: var(--fs-xs); }
  .platform__matrix { grid-template-columns: 1fr; }
  .industry-grid { grid-template-columns: 1fr; }
  .audience-grid { grid-template-columns: 1fr; }
  .mode-grid { grid-template-columns: 1fr; }
  .mode__visual img { height: 220px; }
  .mode__visual-overlay { padding: 14px 18px; font-size: var(--fs-sm); }
  .form-grid { grid-template-columns: 1fr; }
  .effect-grid { grid-template-columns: 1fr; }

  /* 亮点列表 */
  .feat-list li { grid-template-columns: 1fr; gap: 6px; padding: 16px; }
  .feat-list--grid { grid-template-columns: 1fr; }
  .field-row { grid-template-columns: 1fr; }

  /* 统计 */
  .stats__inner { grid-template-columns: repeat(2, 1fr); gap: 24px; }
  .stat__num { font-size: 44px; }

  /* 联系 */
  .contact__info, .contact__form { padding: 28px 22px; }
  .contact__qr { flex-direction: column; text-align: center; }

  /* Footer */
  .footer__inner { flex-direction: column; align-items: flex-start; padding: 36px 18px; }
  .footer__logo { height: 44px; }
  .footer__bottom .container { flex-direction: column; text-align: center; }

  /* 浮动按钮 */
  .fab { bottom: 18px; right: 18px; padding: 12px 16px; }
  .fab span { display: inline; }
}

@media (max-width: 420px) {
  .hero__cta { flex-direction: column; }
  .hero__cta .btn { width: 100%; }
  .stats__inner { grid-template-columns: 1fr; }
}

/* 减少动画偏好 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
    scroll-behavior: auto !important;
  }
  .reveal { opacity: 1; transform: none; }
}

/* ========== 浮动咨询按钮：进入联系区时隐藏，避免遮挡 ========== */
.fab--hidden { opacity: 0; pointer-events: none; transform: scale(.85); }

/* ========== 表单内链接 ========== */
.form__link { color: var(--cyan-light, #0EA5E9); text-decoration: underline; }
.form__link:hover { opacity: .8; }