:root {
  --brand-navy: #0b2f6b;
  --brand-navy-deep: #071f48;
  --brand-green: #8cc63f;
  --brand-green-dark: #6fa32e;
  --text: #1a2332;
  --text-muted: #5c6b7a;
  --bg: #ffffff;
  --bg-soft: #f3f6f9;
  --line: rgba(11, 47, 107, 0.08);
  --shadow: 0 18px 50px rgba(7, 31, 72, 0.1);
  --radius: 4px;
  --font-sans: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-display: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --header-h: 78px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

.container {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: background .3s, border-color .3s, box-shadow .3s;
}

.site-header.is-scrolled {
  border-bottom-color: var(--line);
  box-shadow: 0 8px 24px rgba(7, 31, 72, 0.06);
}

.header-inner {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand img {
  width: 48px;
  height: 48px;
  object-fit: contain;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand-text strong {
  font-family: var(--font-display);
  font-size: 1.15rem;
  color: var(--brand-navy);
  letter-spacing: 0.04em;
}

.brand-text span {
  font-size: 0.68rem;
  color: var(--text-muted);
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.nav {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav a {
  font-size: 0.95rem;
  color: var(--brand-navy);
  position: relative;
  padding: 6px 0;
}

.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--brand-green), var(--brand-navy));
  transition: width .25s ease;
}

.nav a:hover::after,
.nav a.is-active::after {
  width: 100%;
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: var(--radius);
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 4px auto;
  background: var(--brand-navy);
}

.site-main {
  padding-top: var(--header-h);
}

.hero {
  position: relative;
  min-height: calc(100vh - var(--header-h));
  display: flex;
  align-items: center;
  overflow: hidden;
  color: #fff;
  background:
    radial-gradient(circle at 18% 20%, rgba(140, 198, 63, 0.28), transparent 36%),
    radial-gradient(circle at 82% 10%, rgba(140, 198, 63, 0.12), transparent 28%),
    linear-gradient(135deg, var(--brand-navy-deep) 0%, var(--brand-navy) 48%, #134a8c 100%);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, transparent 55%, rgba(7, 31, 72, 0.35)),
    repeating-linear-gradient(-45deg, rgba(255, 255, 255, 0.03) 0 2px, transparent 2px 14px);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 1;
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  padding: 72px 0 88px;
}

.hero-brand {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-bottom: 28px;
  opacity: 0;
  transform: translateY(18px);
  animation: rise .8s ease forwards;
}

.hero-brand img {
  width: 86px;
  height: 86px;
  object-fit: contain;
  filter: drop-shadow(0 10px 24px rgba(0, 0, 0, 0.25));
}

.hero-brand h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  font-weight: 700;
  letter-spacing: 0.08em;
  line-height: 1.15;
}

.hero-brand small {
  display: block;
  margin-top: 8px;
  font-size: 0.85rem;
  letter-spacing: 0.28em;
  color: rgba(255, 255, 255, 0.72);
}

.hero-lead {
  max-width: 36rem;
  margin: 0 0 32px;
  font-size: 1.1rem;
  color: rgba(255, 255, 255, 0.88);
  opacity: 0;
  transform: translateY(18px);
  animation: rise .8s ease .15s forwards;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  opacity: 0;
  transform: translateY(18px);
  animation: rise .8s ease .28s forwards;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  border-radius: var(--radius);
  font-size: 0.95rem;
  border: 1px solid transparent;
  transition: transform .2s ease, background .2s ease, border-color .2s ease, color .2s ease;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: var(--brand-green);
  color: var(--brand-navy-deep);
  font-weight: 600;
}

.btn-primary:hover {
  background: var(--brand-green-dark);
  color: #fff;
}

.btn-ghost {
  border-color: rgba(255, 255, 255, 0.45);
  color: #fff;
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.1);
}

.btn-outline {
  border-color: rgba(11, 47, 107, 0.25);
  color: var(--brand-navy);
}

.btn-outline:hover {
  border-color: var(--brand-navy);
  background: rgba(11, 47, 107, 0.04);
}

.section {
  padding: 88px 0;
}

.section-soft {
  background: var(--bg-soft);
}

.section-head {
  max-width: 40rem;
  margin-bottom: 42px;
}

.section-head .eyebrow {
  display: inline-block;
  margin-bottom: 10px;
  color: var(--brand-green-dark);
  font-size: 0.8rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.section-head h2 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3vw, 2.3rem);
  color: var(--brand-navy);
  letter-spacing: 0.04em;
}

.section-head p {
  margin: 0;
  color: var(--text-muted);
}

.about-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

.about-copy p {
  color: var(--text-muted);
  margin: 0 0 18px;
}

.about-visual {
  min-height: 320px;
  border-radius: 8px;
  background:
    linear-gradient(145deg, rgba(140, 198, 63, 0.18), transparent 40%),
    linear-gradient(160deg, var(--brand-navy), #1a5aa8);
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}

.about-visual::after {
  content: "EV";
  position: absolute;
  right: 24px;
  bottom: 18px;
  font-size: 4rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: rgba(255, 255, 255, 0.16);
}

.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
  counter-reset: step;
}

.step-item {
  position: relative;
  padding: 28px 22px 24px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
}

.step-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: rgba(140, 198, 63, 0.45);
}

.step-item::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  display: block;
  margin-bottom: 16px;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--brand-green);
  letter-spacing: 0.08em;
}

.step-item h3 {
  margin: 0 0 10px;
  font-size: 1.15rem;
  color: var(--brand-navy);
}

.step-item p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.people-grid,
.case-grid,
.video-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.video-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 32px;
}

.video-cats {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.video-cat {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--brand-navy);
  font-size: 0.92rem;
  transition: border-color .2s, background .2s, color .2s;
}

.video-cat:hover,
.video-cat.is-active {
  border-color: var(--brand-green);
  background: rgba(140, 198, 63, 0.12);
  color: var(--brand-navy-deep);
}

.video-search {
  display: flex;
  gap: 8px;
  align-items: center;
}

.video-search input {
  min-width: 200px;
  height: 40px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font: inherit;
}

.video-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  transition: transform .25s ease, box-shadow .25s ease;
}

.video-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.video-cover {
  position: relative;
  aspect-ratio: 16/9;
  background:
    linear-gradient(160deg, rgba(140, 198, 63, 0.35), transparent 50%),
    linear-gradient(145deg, #0b2f6b, #2a6bb8);
}

.video-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.video-play-badge {
  position: absolute;
  right: 12px;
  bottom: 12px;
  padding: 4px 10px;
  background: rgba(11, 47, 107, 0.88);
  color: #fff;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
}

.video-body {
  padding: 16px 18px 20px;
}

.video-body h3 {
  margin: 0 0 8px;
  font-size: 1.05rem;
  color: var(--brand-navy);
}

.video-body p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.9rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.video-empty {
  color: var(--text-muted);
  text-align: center;
  padding: 48px 0;
}

.video-pagination {
  margin-top: 36px;
  text-align: center;
}

.video-pagination .pagination {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 6px;
  list-style: none;
  padding: 0;
  margin: 0;
}

.video-pagination .pagination > li > a,
.video-pagination .pagination > li > span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 36px;
  height: 36px;
  padding: 0 10px;
  border: 1px solid var(--line);
  color: var(--brand-navy);
  border-radius: var(--radius);
}

.video-pagination .pagination > .active > span,
.video-pagination .pagination > .active > a {
  background: var(--brand-navy);
  border-color: var(--brand-navy);
  color: #fff;
}

.video-player-wrap {
  max-width: 960px;
}

.video-player {
  width: 100%;
  aspect-ratio: 16/9;
  background: #000;
  border-radius: 8px;
}

.video-external {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 16px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--bg-soft);
}

.video-external img {
  width: 100%;
  max-width: 640px;
  aspect-ratio: 16/9;
  object-fit: cover;
  border-radius: 6px;
}

.video-external-tip {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.person,
.case-item {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  transition: transform .25s ease, box-shadow .25s ease;
}

.person:hover,
.case-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.person-photo,
.case-cover {
  aspect-ratio: 4/3;
  background:
    linear-gradient(160deg, rgba(140, 198, 63, 0.35), transparent 50%),
    linear-gradient(145deg, #0b2f6b, #2a6bb8);
}

.person-photo img,
.case-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.person-body,
.case-body {
  padding: 18px 18px 22px;
}

.person-body h3,
.case-body h3 {
  margin: 0 0 6px;
  font-size: 1.1rem;
  color: var(--brand-navy);
}

.person-body .role,
.case-body .meta {
  margin: 0 0 10px;
  color: var(--brand-green-dark);
  font-size: 0.88rem;
}

.person-body p,
.case-body p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.92rem;
}

.section-cta {
  margin-top: 36px;
}

.page-banner {
  padding: 72px 0 56px;
  background:
    radial-gradient(circle at 85% 20%, rgba(140, 198, 63, 0.22), transparent 30%),
    linear-gradient(120deg, var(--brand-navy-deep), var(--brand-navy) 60%, #16539a);
  color: #fff;
}

.page-banner h1 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 3.5vw, 2.8rem);
  letter-spacing: 0.06em;
}

.page-banner p {
  margin: 0;
  max-width: 36rem;
  color: rgba(255, 255, 255, 0.82);
}

.rich-content {
  max-width: 760px;
}

.rich-content p {
  color: var(--text-muted);
  margin: 0 0 1em;
}

.detail-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 40px;
  align-items: start;
}

.detail-side {
  aspect-ratio: 3/4;
  border-radius: 8px;
  overflow: hidden;
  background: linear-gradient(145deg, #0b2f6b, #2a6bb8);
}

.detail-side img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.detail-main h1 {
  margin: 0 0 10px;
  color: var(--brand-navy);
}

.detail-main .meta {
  margin: 0 0 20px;
  color: var(--brand-green-dark);
}

.site-footer {
  background: var(--brand-navy-deep);
  color: rgba(255, 255, 255, 0.78);
  padding: 56px 0 28px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 40px;
  margin-bottom: 36px;
}

.footer-brand {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}

.footer-brand img {
  width: 56px;
  height: 56px;
  object-fit: contain;
}

.footer-brand h3 {
  margin: 0 0 8px;
  color: #fff;
  font-size: 1.2rem;
}

.footer-brand p {
  margin: 0;
  max-width: 28rem;
  font-size: 0.92rem;
}

.footer-contact p {
  margin: 0 0 8px;
}

.footer-contact strong {
  color: var(--brand-green);
  font-weight: 600;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 18px;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.5);
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .7s ease, transform .7s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

@keyframes rise {
  to {
    opacity: 1;
    transform: none;
  }
}

@media (max-width: 960px) {
  .steps,
  .people-grid,
  .case-grid,
  .video-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .about-grid,
  .detail-layout,
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-toggle {
    display: block;
  }

  .nav {
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 12px 20px 20px;
    background: #fff;
    border-bottom: 1px solid var(--line);
    box-shadow: 0 12px 30px rgba(7, 31, 72, 0.08);
  }

  .nav.is-open {
    display: flex;
  }

  .nav li {
    width: 100%;
  }

  .nav a {
    display: block;
    padding: 12px 0;
  }

  .hero-brand {
    flex-direction: column;
    align-items: flex-start;
  }

  .steps,
  .people-grid,
  .case-grid,
  .video-grid {
    grid-template-columns: 1fr;
  }

  .video-toolbar {
    flex-direction: column;
    align-items: stretch;
  }

  .video-search input {
    min-width: 0;
    flex: 1;
  }

  .brand-text span {
    display: none;
  }
}