:root {
  --c-bg:       #0a1628;
  --c-bg-alt:   #0f1e38;
  --c-fg:       #e8f4f8;
  --c-muted:    #6b8fa8;
  --c-accent:   #00d4ff;
  --c-accent-d: #0099bb;
  --c-border:   #1a2e4a;
  --c-surface:  #112240;

  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2.5rem;
  --space-5: 4rem;
  --space-6: 7rem;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;

  --font-display: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body:    'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;

  --fw-normal: 400;
  --fw-bold:   700;
}

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

html { background-color: var(--c-bg); }

body {
  font-family: var(--font-body);
  font-weight: var(--fw-normal);
  background-color: var(--c-bg);
  color: var(--c-fg);
  line-height: 1.6;
  font-size: clamp(0.9rem, 1vw + 0.75rem, 1.05rem);
}

a { color: var(--c-accent); text-decoration: none; }
a:hover { text-decoration: underline; }

ul, ol { list-style: none; }

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

.container {
  width: 100%;
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: var(--space-4);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(10, 22, 40, 0.95);
  border-bottom: 1px solid var(--c-border);
  backdrop-filter: blur(8px);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-2);
}

.site-header__brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  color: var(--c-fg);
}

.site-header__brand:hover { text-decoration: none; }

.site-header__logo { width: 36px; height: 36px; flex-shrink: 0; }

.site-header__name {
  font-family: var(--font-display);
  font-weight: var(--fw-bold);
  font-size: 1.1rem;
  color: var(--c-fg);
  letter-spacing: 0.02em;
}

.site-header__back {
  font-size: 0.85rem;
  color: var(--c-muted);
  display: flex;
  align-items: center;
  gap: 6px;
  text-decoration: none;
}

.site-header__back:hover { color: var(--c-accent); text-decoration: none; }

.site-header__back svg {
  width: 14px;
  height: 14px;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.page-hero {
  padding-block: var(--space-5);
  border-bottom: 1px solid var(--c-border);
  background-color: var(--c-bg-alt);
}

.page-hero__label {
  display: inline-block;
  font-family: var(--font-display);
  font-weight: var(--fw-bold);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-accent);
  margin-bottom: var(--space-2);
}

.page-hero__title {
  font-family: var(--font-display);
  font-weight: var(--fw-bold);
  font-size: clamp(1.8rem, 3vw + 0.75rem, 3rem);
  line-height: 1.2;
  margin-bottom: var(--space-2);
}

.page-hero__meta { font-size: 0.85rem; color: var(--c-muted); }

.about-intro {
  padding-block: var(--space-5);
  border-bottom: 1px solid var(--c-border);
}

.about-intro__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-6);
  align-items: center;
}

.about-intro__img-box {
  width: 100%;
  aspect-ratio: 4/3;
  border-radius: var(--radius-lg);
  border: 1px solid var(--c-border);
  overflow: hidden;
}

.about-intro__img-box img { width: 100%; height: 100%; object-fit: cover; }

.about-intro__content { display: flex; flex-direction: column; gap: var(--space-3); }

.about-intro__label {
  font-family: var(--font-display);
  font-weight: var(--fw-bold);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-accent);
}

.about-intro__title {
  font-family: var(--font-display);
  font-weight: var(--fw-bold);
  font-size: clamp(1.4rem, 2vw + 0.5rem, 2rem);
  line-height: 1.25;
  color: var(--c-fg);
}

.about-intro__body {
  color: var(--c-muted);
  line-height: 1.8;
  font-size: 0.95rem;
}

.about-values {
  padding-block: var(--space-5);
  border-bottom: 1px solid var(--c-border);
  background-color: var(--c-bg-alt);
}

.about-values__header {
  text-align: center;
  margin-bottom: var(--space-5);
}

.about-values__eyebrow {
  font-family: var(--font-display);
  font-weight: var(--fw-bold);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-accent);
  display: block;
  margin-bottom: var(--space-2);
}

.about-values__title {
  font-family: var(--font-display);
  font-weight: var(--fw-bold);
  font-size: clamp(1.4rem, 2vw + 0.5rem, 2rem);
  line-height: 1.2;
  color: var(--c-fg);
}

.about-values__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
}

.value-card {
  background-color: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.25);
}

.value-card__num {
  font-family: var(--font-display);
  font-weight: var(--fw-bold);
  font-size: 2rem;
  color: var(--c-border);
  line-height: 1;
  margin-bottom: var(--space-2);
}

.value-card__title {
  font-family: var(--font-display);
  font-weight: var(--fw-bold);
  font-size: 1.05rem;
  color: var(--c-fg);
  margin-bottom: var(--space-2);
}

.value-card__desc { font-size: 0.88rem; color: var(--c-muted); line-height: 1.7; }

.about-team {
  padding-block: var(--space-5);
}

.about-team__header {
  text-align: center;
  margin-bottom: var(--space-5);
}

.about-team__eyebrow {
  font-family: var(--font-display);
  font-weight: var(--fw-bold);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-accent);
  display: block;
  margin-bottom: var(--space-2);
}

.about-team__title {
  font-family: var(--font-display);
  font-weight: var(--fw-bold);
  font-size: clamp(1.4rem, 2vw + 0.5rem, 2rem);
  line-height: 1.2;
  color: var(--c-fg);
}

.about-team__text {
  max-width: 640px;
  margin-inline: auto;
  margin-top: var(--space-2);
  color: var(--c-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
  margin-top: var(--space-5);
}

.team-card {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
}

.team-card__avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background-color: var(--c-surface);
  border: 2px solid var(--c-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-weight: var(--fw-bold);
  font-size: 1.4rem;
  color: var(--c-accent);
}

.team-card__name {
  font-family: var(--font-display);
  font-weight: var(--fw-bold);
  font-size: 0.95rem;
  color: var(--c-fg);
}

.team-card__role { font-size: 0.82rem; color: var(--c-muted); }

.legal-content {
  padding-block: var(--space-5);
  max-width: 820px;
  margin-inline: auto;
}

.legal-content h2 {
  font-family: var(--font-display);
  font-weight: var(--fw-bold);
  font-size: 1.2rem;
  color: var(--c-fg);
  margin-top: var(--space-4);
  margin-bottom: var(--space-2);
  padding-bottom: var(--space-1);
  border-bottom: 1px solid var(--c-border);
}

.legal-content p {
  color: var(--c-muted);
  line-height: 1.8;
  font-size: 0.95rem;
  margin-bottom: var(--space-2);
}

.legal-content ul {
  list-style: disc;
  padding-left: var(--space-4);
  color: var(--c-muted);
  font-size: 0.95rem;
  line-height: 1.8;
  margin-bottom: var(--space-2);
}

.legal-content ul li { margin-bottom: var(--space-1); }

.legal-notice {
  background-color: var(--c-surface);
  border: 1px solid var(--c-border);
  border-left: 3px solid var(--c-accent);
  border-radius: var(--radius-sm);
  padding: var(--space-3) var(--space-4);
  font-size: 0.9rem;
  color: var(--c-muted);
  line-height: 1.7;
  margin-bottom: var(--space-3);
}

.site-footer {
  background-color: var(--c-bg);
  border-top: 1px solid var(--c-border);
  padding-block: var(--space-4);
}

.site-footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.site-footer__copy { font-size: 0.82rem; color: var(--c-muted); }

.site-footer__legal { display: flex; gap: var(--space-3); flex-wrap: wrap; }

.site-footer__legal a { font-size: 0.82rem; color: var(--c-muted); }

.site-footer__legal a:hover { color: var(--c-accent); text-decoration: none; }

@media (max-width: 1024px) {
  .container { padding-inline: var(--space-3); }
  .about-values__grid { grid-template-columns: 1fr 1fr; }
  .team-grid { grid-template-columns: repeat(2, 1fr); }
  .about-intro__inner { grid-template-columns: 1fr; gap: var(--space-4); }
}

.about-section {
  margin-bottom: var(--space-6);
  padding: var(--space-5) 0;
}

.about-section__label {
  display: block;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--c-accent);
  margin-bottom: var(--space-2);
}

.about-section__title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 5vw, 2.5rem);
  font-weight: 700;
  color: var(--c-fg);
  margin-bottom: var(--space-4);
  line-height: 1.2;
}

.about-section__title--centered {
  text-align: center;
  margin-inline: auto;
  max-width: 700px;
}

.about-section__body {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--c-muted);
  margin-bottom: var(--space-3);
}

.about-section__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-5);
  align-items: center;
}

.about-section__grid--reverse {
  grid-auto-flow: dense;
}

.about-section__grid--reverse .about-section__image {
  grid-column: 1;
}

.about-section__grid--reverse .about-section__content {
  grid-column: 2;
}

.about-section__image {
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--c-surface);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.about-section__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.about-section__content {
  padding: var(--space-2);
}

.about-section__centered {
  margin-inline: auto;
  max-width: 800px;
  text-align: center;
}

.about-section__split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
  margin-top: var(--space-4);
}

.about-section__mission-block {
  padding: var(--space-4);
  background-color: rgba(0, 212, 255, 0.05);
  border-radius: var(--radius-md);
  border: 1px solid rgba(0, 212, 255, 0.1);
}

.about-section__mission-block h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--c-accent);
  margin-bottom: var(--space-2);
}

.about-section__mission-block p {
  font-size: 0.95rem;
  color: var(--c-muted);
  line-height: 1.6;
}

.about-section__values-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
  margin-top: var(--space-4);
}

.about-section__value-card {
  padding: var(--space-4);
  background-color: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.about-section__value-card h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--c-accent);
  margin-bottom: var(--space-2);
}

.about-section__value-card p {
  font-size: 0.9rem;
  color: var(--c-muted);
  line-height: 1.5;
}

.about-section__timeline {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
  margin-top: var(--space-5);
}

.about-section__timeline-item {
  padding: var(--space-4);
  background-color: rgba(0, 212, 255, 0.05);
  border-left: 3px solid var(--c-accent);
  border-radius: var(--radius-sm);
}

.about-section__timeline-year {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--c-accent);
  margin-bottom: var(--space-2);
}

.about-section__timeline-item h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--c-fg);
  margin-bottom: var(--space-2);
}

.about-section__timeline-item p {
  font-size: 0.9rem;
  color: var(--c-muted);
  line-height: 1.5;
}

.about-section__trust-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
  margin-top: var(--space-5);
}

.about-section__trust-item {
  padding: var(--space-4);
  background-color: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  text-align: center;
}

.about-section__trust-stat {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--c-accent);
  margin-bottom: var(--space-2);
}

.about-section__trust-label {
  display: block;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--c-fg);
  margin-bottom: var(--space-2);
}

.about-section__trust-item p {
  font-size: 0.9rem;
  color: var(--c-muted);
  line-height: 1.5;
}

.about-section__cta-box {
  margin-inline: auto;
  max-width: 800px;
  padding: var(--space-5);
  background-color: rgba(0, 212, 255, 0.08);
  border: 1px solid rgba(0, 212, 255, 0.2);
  border-radius: var(--radius-lg);
  text-align: center;
}

.about-section__cta-box p {
  font-size: 1rem;
  color: var(--c-muted);
  margin-bottom: var(--space-4);
  line-height: 1.6;
}

.about-section__contact-details {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
  margin-bottom: var(--space-5);
  text-align: left;
}

.about-section__contact-item {
  padding: var(--space-3);
  background-color: var(--c-surface);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  color: var(--c-muted);
  line-height: 1.6;
}

.about-section__contact-item strong {
  color: var(--c-fg);
  display: block;
  margin-bottom: var(--space-1);
}

.about-section__cta-buttons {
  display: flex;
  justify-content: center;
  gap: var(--space-3);
}

@media (max-width: 1024px) {
  .about-section__grid {
    grid-template-columns: 1fr;
  }

  .about-section__grid--reverse .about-section__image,
  .about-section__grid--reverse .about-section__content {
    grid-column: auto;
  }

  .about-section__split {
    grid-template-columns: 1fr;
  }

  .about-section__values-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .about-section__timeline {
    grid-template-columns: repeat(2, 1fr);
  }

  .about-section__trust-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .about-section__contact-details {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .container { padding-inline: var(--space-2); }

  .about-section {
    padding: var(--space-4) 0;
    margin-bottom: var(--space-4);
  }

  .about-section__title {
    font-size: clamp(1.25rem, 4vw, 1.75rem);
  }

  .about-section__split {
    grid-template-columns: 1fr;
  }

  .about-section__values-grid {
    grid-template-columns: 1fr;
  }

  .about-section__timeline {
    grid-template-columns: 1fr;
  }

  .about-section__trust-grid {
    grid-template-columns: 1fr;
  }

  .about-section__contact-details {
    grid-template-columns: 1fr;
  }

  .about-section__cta-buttons {
    flex-direction: column;
  }

  .about-section__cta-buttons .btn {
    width: 100%;
  }

  .site-footer__bottom { flex-direction: column; align-items: flex-start; }
  .site-footer__legal { flex-wrap: wrap; }
}

.about-section__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* wh-img-fill */
.about-section__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}