/* ==========================================================================
   USP Theme v2 — 严格对齐 usp.ac.fj 真实设计
   2026-10-11

   真实色彩 (从 archive.org HTML 提取):
   - #002432 (主深蓝绿)    -rgb(0, 36, 50)
   - #33A3AA (青绿)         -rgb(51, 163, 170)
   - #0AB7D9 (亮青)         -rgb(10, 183, 217)
   - #008C95 (深青)         -rgb(0, 140, 149)
   - #4F5051 (深灰文字)     -rgb(79, 80, 81)
   - #EBEBEC (浅灰)         -rgb(235, 235, 236)

   真实字体: Arial, Helvetica, sans-serif (无衬线)
   ========================================================================== */

:root {
  --usp-dark:        #002432;
  --usp-teal:        #33A3AA;
  --usp-cyan:        #0AB7D9;
  --usp-cyan-dark:   #008C95;
  --usp-gray-50:     #f7f9fa;
  --usp-gray-100:    #ebebec;
  --usp-gray-200:    #d0d4d7;
  --usp-gray-700:    #4f5051;
  --usp-gray-900:    #1a1f2e;
  --usp-white:        #ffffff;
  --usp-accent:      #e8a93c;

  --font-sans:       Arial, "Helvetica Neue", Helvetica, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;

  --space-1: 0.25rem;  --space-2: 0.5rem;   --space-3: 0.75rem;
  --space-4: 1rem;     --space-5: 1.5rem;   --space-6: 2rem;
  --space-8: 3rem;     --space-10: 4rem;    --space-12: 6rem;
  --space-16: 8rem;    --space-20: 10rem;

  --transition: 200ms ease;
}

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  color: var(--usp-gray-700);
  background: var(--usp-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img { max-width: 100%; display: block; }
a { color: var(--usp-dark); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--usp-cyan); }
h1, h2, h3, h4, h5, h6 {
  margin: 0 0 var(--space-4);
  font-weight: 700;
  font-family: var(--font-sans);
  color: var(--usp-dark);
  line-height: 1.3;
}
ul, ol { margin: 0 0 var(--space-4); padding-left: 1.5rem; }
p { margin: 0 0 var(--space-4); }


/* ===== Site Header (Bootstrap 风格顶栏) ===== */
.site-header {
  background: var(--usp-white);
  border-bottom: 1px solid var(--usp-gray-200);
  position: relative;
}
.site-header__top {
  background: var(--usp-dark);
  color: var(--usp-white);
  font-size: 0.8125rem;
}
.site-header__top-inner {
  max-width: 1320px;
  margin: 0 auto;
  padding: 0.5rem 1.5rem;
  display: flex;
  justify-content: flex-end;
  gap: 1rem;
}
.site-header__top a {
  color: var(--usp-white);
  opacity: 0.9;
}
.site-header__top a:hover { opacity: 1; color: var(--usp-white); }

.site-header__main {
  max-width: 1320px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}
.site-brand {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
}
.site-brand__img {
  height: 56px;
  width: auto;
}
.site-header__nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}
.site-header__nav-item {
  padding: 0.5rem 1rem;
  color: var(--usp-dark);
  font-weight: 500;
  font-size: 0.9375rem;
  white-space: nowrap;
  transition: background var(--transition);
}
.site-header__nav-item:hover {
  background: var(--usp-gray-50);
  color: var(--usp-cyan);
}


/* ===== Hero (USP 真实 carousel 风格) ===== */
.home-hero {
  position: relative;
  background: var(--usp-dark);
  color: var(--usp-white);
  overflow: hidden;
}
.home-hero__image {
  width: 100%;
  height: 60vh;
  min-height: 400px;
  max-height: 600px;
  object-fit: cover;
  display: block;
}
.home-hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(0,36,50,0.3) 0%, rgba(0,36,50,0.7) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 2rem;
}
.home-hero__content {
  max-width: 48rem;
  position: relative;
  z-index: 1;
}
.home-hero__eyebrow {
  display: inline-block;
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--usp-cyan);
  margin: 0 0 1rem;
  padding: 0.5rem 1rem;
  border: 2px solid var(--usp-cyan);
}
.home-hero__title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--usp-white);
  margin: 0 0 1rem;
  text-shadow: 0 2px 8px rgba(0,0,0,0.4);
}
.home-hero__sub {
  font-size: 1.125rem;
  color: rgba(255,255,255,0.92);
  margin: 0 0 1.5rem;
  text-shadow: 0 1px 4px rgba(0,0,0,0.3);
}
.home-hero__actions {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  flex-wrap: wrap;
}


/* ===== Buttons (USP 真实 Bootstrap 风格) ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: 4px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  letter-spacing: 0.02em;
}
.btn--primary {
  background: var(--usp-cyan);
  color: var(--usp-white);
  border-color: var(--usp-cyan);
}
.btn--primary:hover {
  background: var(--usp-cyan-dark);
  border-color: var(--usp-cyan-dark);
  color: var(--usp-white);
}
.btn--secondary {
  background: var(--usp-white);
  color: var(--usp-dark);
  border-color: var(--usp-dark);
}
.btn--secondary:hover {
  background: var(--usp-dark);
  color: var(--usp-white);
}
.btn--outline {
  background: transparent;
  color: var(--usp-white);
  border-color: var(--usp-white);
}
.btn--outline:hover {
  background: var(--usp-white);
  color: var(--usp-dark);
}


/* ===== Sections (USP 真实网格) ===== */
.section {
  width: 100%;
  padding: 4rem 1.5rem;
}
.section--grey { background: var(--usp-gray-50); }
.section--dark { background: var(--usp-dark); color: var(--usp-white); }
.section--dark h2, .section--dark h3 { color: var(--usp-white); }
.section__container {
  max-width: 1320px;
  margin: 0 auto;
}
.section__head {
  text-align: center;
  margin-bottom: 3rem;
}
.section__head--left { text-align: left; }
.section__title {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 700;
  color: var(--usp-dark);
  margin: 0 0 0.5rem;
}
.section--dark .section__title { color: var(--usp-white); }
.section__sub {
  font-size: 1.0625rem;
  color: var(--usp-gray-700);
  max-width: 48rem;
  margin: 0 auto;
}
.section--dark .section__sub { color: rgba(255,255,255,0.85); }


/* ===== Cards / Grid (Bootstrap 风格) ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
.card-grid--2 { grid-template-columns: repeat(2, 1fr); }
.card-grid--4 { grid-template-columns: repeat(4, 1fr); }
.card {
  background: var(--usp-white);
  border: 1px solid var(--usp-gray-200);
  border-radius: 6px;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  text-decoration: none;
  color: inherit;
  transition: all var(--transition);
}
.card:hover {
  border-color: var(--usp-cyan);
  box-shadow: 0 4px 12px rgba(10,183,217,0.12);
  transform: translateY(-2px);
}
.card--dark {
  background: var(--usp-dark);
  color: var(--usp-white);
  border-color: var(--usp-dark);
}
.card__title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--usp-dark);
  margin: 0;
}
.card--dark .card__title { color: var(--usp-cyan); }
.card__body {
  font-size: 0.9375rem;
  color: var(--usp-gray-700);
  line-height: 1.5;
  flex: 1;
}
.card--dark .card__body { color: rgba(255,255,255,0.85); }
.card__cta {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--usp-cyan);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: 0.5rem;
}
.card__cta::after { content: " →"; }
.card__icon {
  width: 48px;
  height: 48px;
  background: var(--usp-cyan);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--usp-white);
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}


/* ===== Page Hero (内页) ===== */
.page-hero {
  background: var(--usp-gray-50);
  padding: 3rem 1.5rem;
  border-bottom: 1px solid var(--usp-gray-200);
}
.page-hero__container {
  max-width: 1320px;
  margin: 0 auto;
}
.page-hero__breadcrumb {
  font-size: 0.875rem;
  color: var(--usp-gray-700);
  margin: 0 0 0.5rem;
}
.page-hero__breadcrumb a { color: var(--usp-cyan); }
.page-hero__title {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 700;
  color: var(--usp-dark);
  margin: 0 0 0.5rem;
}
.page-hero__sub {
  font-size: 1.125rem;
  color: var(--usp-gray-700);
  max-width: 48rem;
  margin: 0;
}


/* ===== Content (prose) ===== */
.page-content {
  max-width: 1320px;
  margin: 0 auto;
  padding: 3rem 1.5rem;
}
.prose {
  max-width: 56rem;
  font-size: 1.0625rem;
  line-height: 1.75;
  color: var(--usp-gray-700);
}
.prose h2 {
  font-size: 1.625rem;
  color: var(--usp-dark);
  margin: 2.5rem 0 1rem;
  border-left: 4px solid var(--usp-cyan);
  padding-left: 0.75rem;
}
.prose h3 {
  font-size: 1.25rem;
  color: var(--usp-dark);
  margin: 1.5rem 0 0.5rem;
}
.prose a { color: var(--usp-cyan); text-decoration: underline; }
.prose blockquote {
  border-left: 4px solid var(--usp-cyan);
  padding: 0.75rem 1.5rem;
  margin: 1.5rem 0;
  background: var(--usp-gray-50);
  font-style: italic;
}


/* ===== Footer ===== */
.site-footer {
  background: var(--usp-dark);
  color: var(--usp-white);
  padding: 3rem 1.5rem 1.5rem;
}
.site-footer__grid {
  max-width: 1320px;
  margin: 0 auto 2rem;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
  gap: 2rem;
}
.site-footer__col h4 {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--usp-cyan);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin: 0 0 0.75rem;
}
.site-footer__col ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.site-footer__col li {
  font-size: 0.875rem;
  margin: 0 0 0.5rem;
}
.site-footer__col a {
  color: rgba(255,255,255,0.85);
  transition: color var(--transition);
}
.site-footer__col a:hover { color: var(--usp-cyan); }
.site-footer__bottom {
  max-width: 1320px;
  margin: 0 auto;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255,255,255,0.15);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.8125rem;
  color: rgba(255,255,255,0.65);
}


/* ===== Network (站群内链) ===== */
.site-footer__network {
  max-width: 1320px;
  margin: 1.5rem auto 0;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255,255,255,0.15);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 1.5rem;
}
.site-footer__network-label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--usp-cyan);
  letter-spacing: 0.1em;
}
.site-footer__network ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
}
.site-footer__network a {
  color: rgba(255,255,255,0.85);
  font-size: 0.8125rem;
}


/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .site-header__nav { display: none; }
  .card-grid, .card-grid--4 { grid-template-columns: 1fr 1fr; }
  .site-footer__grid { grid-template-columns: 1fr 1fr; }
  .home-hero__image { height: 50vh; }
}
@media (max-width: 640px) {
  .site-header__main { flex-direction: column; padding: 0.75rem 1rem; }
  .site-brand__img { height: 40px; }
  .card-grid, .card-grid--2, .card-grid--4 { grid-template-columns: 1fr; }
  .site-footer__grid { grid-template-columns: 1fr; }
  .home-hero__image { height: 40vh; }
  .section { padding: 2.5rem 1rem; }
}