/* ==========================================================================
   USC Theme — 严格对齐 usc.edu.ph 真实设计
   2026-10-13 v1

   真实设计系统 (从 usc.edu.ph 提取):
   - 主色: deep forest green #015E2F (h2 标题, button hover, 顶栏点缀)
   - 辅色: warm gold       #FCBF16 (CTA 填充, eyebrow, 拉丁箴言)
   - 背景: white + warm cream #F4F4F4 (section--alt bg)
   - 字体: Inter (heading) + Montserrat (body) + PingFang/Microsoft YaHei 中文
   - 风格: 现代 clean, 深绿 CSS 渐变 hero, pill 胶囊按钮 (border-radius: 50px)
   ========================================================================== */

:root {
  --usc-primary:        #015E2F;
  --usc-primary-dark:   #01431F;
  --usc-accent:         #FCBF16;
  --usc-accent-dark:    #D9A100;
  --usc-bg:             #FFFFFF;
  --usc-bg-alt:         #F4F4F4;
  --usc-bg-dark:        #1a1a1a;
  --usc-ink:            #191919;
  --usc-muted:          #4E4B66;
  --usc-border:         #EBEBEB;
  --usc-green-2:        #00763A;
  --usc-green-3:        #22944D;

  --usc-font-heading:   "Inter", "Helvetica Neue", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --usc-font-body:      "Montserrat", "Inter", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;

  --usc-s-xxs: .25rem; --usc-s-xs: .5rem;  --usc-s-s:  1rem;
  --usc-s-m:  1.5rem; --usc-s-l:  2rem;   --usc-s-xl: 2.5rem;
  --usc-s-xxl: 3rem;  --usc-s-xxxl: 4rem;  --usc-s-xxxxl: 5rem;

  --usc-radius:         4px;
  --usc-radius-pill:    50px;
  --usc-t:              200ms ease;
  --usc-container:      1280px;
}

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

body {
  margin: 0;
  font-family: var(--usc-font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--usc-ink);
  background: var(--usc-bg);
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: var(--usc-primary); text-decoration: none; transition: color var(--usc-t); }
a:hover { color: var(--usc-accent-dark); }

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 var(--usc-s-s);
  font-family: var(--usc-font-heading);
  font-weight: 700;
  line-height: 1.2;
  color: var(--usc-primary);
  letter-spacing: -0.02em;
}
h1 { font-size: clamp(2.25rem, 5vw, 3.75rem); font-weight: 800; }
h2 { font-size: clamp(1.75rem, 3.5vw, 2.75rem); font-weight: 700; }
h3 { font-size: 1.25rem; color: var(--usc-ink); }
p { margin: 0 0 var(--usc-s-s); }

.container { max-width: var(--usc-container); margin: 0 auto; padding: 0 var(--usc-s-m); }
.section { padding: var(--usc-s-xxxl) 0; }
.section--alt { background: var(--usc-bg-alt); }

.section__head { margin-bottom: var(--usc-s-xl); max-width: 720px; }
.section__eyebrow {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--usc-accent-dark);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--usc-s-s);
}
.section__eyebrow::before {
  content: '';
  display: inline-block;
  width: 32px;
  height: 2px;
  background: var(--usc-accent);
  margin-right: var(--usc-s-s);
  vertical-align: middle;
}
.section__head h2 { margin-bottom: var(--usc-s-s); }
.section__head p { font-size: 1.05rem; color: var(--usc-muted); margin: 0; }

/* ===== Site Header (USC 真实: 白色 utility + 白色 main) ===== */
.site-header {
  background: var(--usc-bg);
  position: relative;
  z-index: 10;
}
.site-header__utility {
  background: var(--usc-bg-alt);
  border-bottom: 1px solid var(--usc-border);
}
.site-header__utility-inner {
  max-width: var(--usc-container);
  margin: 0 auto;
  padding: var(--usc-s-xs) var(--usc-s-m);
  display: flex;
  justify-content: flex-end;
  gap: var(--usc-s-m);
  font-size: 0.8rem;
}
.site-header__utility a { color: var(--usc-ink-soft, #555); }
.site-header__utility a:hover { color: var(--usc-primary); }

.site-header__main {
  border-bottom: 1px solid var(--usc-border);
}
.site-header__main-inner {
  max-width: var(--usc-container);
  margin: 0 auto;
  padding: var(--usc-s-s) var(--usc-s-m);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--usc-s-m);
}
.site-brand {
  display: flex;
  align-items: center;
  gap: var(--usc-s-xs);
}
.site-brand__img { height: 48px; width: auto; display: block; }
.site-brand__text strong {
  display: block;
  font-family: var(--usc-font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--usc-primary);
  line-height: 1.2;
}
.site-brand__text em {
  display: block;
  font-style: normal;
  font-size: 0.72rem;
  color: var(--usc-muted);
  letter-spacing: 0.04em;
  margin-top: 2px;
}

.site-header__nav {
  display: flex;
  gap: var(--usc-s-l);
  align-items: center;
}
.site-header__nav-item {
  color: var(--usc-ink);
  font-size: 0.95rem;
  font-weight: 500;
  padding: var(--usc-s-xs) 0;
  border-bottom: 2px solid transparent;
  transition: all var(--usc-t);
}
.site-header__nav-item:hover {
  color: var(--usc-primary);
  border-bottom-color: var(--usc-accent);
}

.site-header__action-apply {
  background: var(--usc-accent);
  color: var(--usc-primary-dark);
  padding: var(--usc-s-xs) var(--usc-s-l);
  border-radius: var(--usc-radius-pill);
  font-weight: 700;
  font-size: 0.9rem;
  transition: background var(--usc-t);
}
.site-header__action-apply:hover {
  background: var(--usc-accent-dark);
  color: var(--usc-primary-dark);
}

/* ===== Hero (USC 现代: 深绿 CSS 渐变 + 大字标题) ===== */
.home-hero {
  position: relative;
  height: 68vh;
  min-height: 480px;
  max-height: 720px;
  overflow: hidden;
  background: linear-gradient(135deg, var(--usc-primary) 0%, var(--usc-primary-dark) 100%);
}
.home-hero__pattern {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 20% 30%, rgba(252,194,16,0.08) 0%, transparent 40%),
    radial-gradient(circle at 80% 70%, rgba(252,194,16,0.06) 0%, transparent 50%);
  z-index: 0;
}
.home-hero__inner {
  position: relative;
  z-index: 2;
  max-width: var(--usc-container);
  margin: 0 auto;
  padding: var(--usc-s-xxxl) var(--usc-s-m);
  color: var(--usc-bg);
}
.home-hero__eyebrow {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  padding: var(--usc-s-xxs) var(--usc-s-s);
  background: var(--usc-accent);
  color: var(--usc-primary-dark);
  margin-bottom: var(--usc-s-m);
  border-radius: var(--usc-radius-pill);
}
.home-hero__title {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  color: var(--usc-bg);
  margin: 0 0 var(--usc-s-m);
  max-width: 14ch;
  font-weight: 800;
  text-shadow: 0 2px 16px rgba(0,0,0,0.3);
}
.home-hero__sub {
  font-size: 1.1rem;
  color: rgba(255,255,255,0.92);
  max-width: 580px;
  margin-bottom: var(--usc-s-l);
  text-shadow: 0 1px 8px rgba(0,0,0,0.3);
}

/* ===== Buttons (USC 现代: pill 胶囊) ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--usc-s-xs);
  padding: var(--usc-s-s) var(--usc-s-l);
  border-radius: var(--usc-radius-pill);
  font-size: 0.95rem;
  font-weight: 700;
  text-decoration: none;
  transition: all var(--usc-t);
  cursor: pointer;
  border: 1.5px solid transparent;
}
.btn--primary { background: var(--usc-accent); color: var(--usc-primary-dark); }
.btn--primary:hover { background: var(--usc-accent-dark); color: var(--usc-primary-dark); }
.btn--ghost {
  background: transparent;
  color: var(--usc-primary);
  border: 1.5px solid var(--usc-primary);
}
.btn--ghost:hover {
  background: var(--usc-primary);
  color: var(--usc-bg);
}

/* ===== Programas Grid (6 大学科方向) ===== */
.programas-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--usc-s-m);
}
@media (max-width: 900px) { .programas-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .programas-grid { grid-template-columns: 1fr; } }

.programa-card {
  display: block;
  background: var(--usc-bg);
  border-radius: var(--usc-radius);
  padding: var(--usc-s-l);
  text-decoration: none;
  transition: all var(--usc-t);
  border: 1px solid var(--usc-border);
}
.programa-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(1,94,47,0.10);
  border-color: var(--usc-primary);
}
.programa-card__head {
  margin-bottom: var(--usc-s-s);
}
.programa-card__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: var(--usc-primary);
  color: var(--usc-accent);
  border-radius: var(--usc-radius);
  font-weight: 700;
  font-size: 0.85rem;
}
.programa-card h3 {
  font-size: 1.1rem;
  color: var(--usc-ink);
  margin-bottom: var(--usc-s-xs);
}
.programa-card h3 span {
  display: block;
  font-size: 0.9rem;
  color: var(--usc-primary);
  font-weight: 600;
  margin-top: 2px;
}
.programa-card p {
  font-size: 0.9rem;
  color: var(--usc-muted);
  margin: 0;
}

/* ===== Valores (历史时间轴 5 节点) ===== */
.valores-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--usc-s-l);
}
@media (max-width: 1100px) { .valores-grid { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 768px) { .valores-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 500px) { .valores-grid { grid-template-columns: 1fr; } }

.valor {
  text-align: left;
}
.valor__num {
  display: inline-block;
  font-family: var(--usc-font-heading);
  font-size: 2rem;
  font-weight: 800;
  color: var(--usc-accent-dark);
  margin-bottom: var(--usc-s-s);
  line-height: 1;
  letter-spacing: -0.02em;
}
.valor h3 {
  font-size: 1rem;
  color: var(--usc-primary);
  margin-bottom: var(--usc-s-xs);
  line-height: 1.3;
}
.valor h3 span {
  display: block;
  font-size: 0.85rem;
  color: var(--usc-green-2);
  font-weight: 500;
  margin-top: 2px;
}
.valor h3::after {
  content: '';
  display: block;
  width: 24px;
  height: 2px;
  background: var(--usc-accent);
  margin-top: var(--usc-s-xs);
}
.valor p {
  font-size: 0.85rem;
  color: var(--usc-muted);
  margin: 0;
  line-height: 1.55;
}

/* ===== Sedes (宿务校园 3 节点) ===== */
.sedes-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--usc-s-m);
}
@media (max-width: 900px) { .sedes-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .sedes-grid { grid-template-columns: 1fr; } }

.sede {
  background: var(--usc-bg);
  border: 1px solid var(--usc-border);
  border-left: 4px solid var(--usc-accent);
  border-radius: var(--usc-radius);
  padding: var(--usc-s-l);
}
.sede h3 {
  font-size: 1.15rem;
  color: var(--usc-primary);
  margin-bottom: var(--usc-s-s);
  line-height: 1.3;
}
.sede p {
  font-size: 0.9rem;
  color: var(--usc-muted);
  margin-bottom: var(--usc-s-s);
}
.sede__tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--usc-primary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* ===== CTA 申请 (金色背景) ===== */
.home-cta {
  background: linear-gradient(135deg, var(--usc-accent) 0%, var(--usc-accent-dark) 100%);
  color: var(--usc-primary-dark);
  padding: var(--usc-s-xxxxl) 0;
  text-align: center;
}
.home-cta h2 {
  color: var(--usc-primary-dark);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  margin-bottom: var(--usc-s-s);
}
.home-cta p {
  color: rgba(25,25,25,0.78);
  max-width: 640px;
  margin: 0 auto var(--usc-s-l);
  font-size: 1.05rem;
}
.home-cta__actions {
  display: flex;
  gap: var(--usc-s-s);
  justify-content: center;
  flex-wrap: wrap;
}
.home-cta .btn--primary {
  background: var(--usc-primary);
  color: var(--usc-bg);
}
.home-cta .btn--primary:hover {
  background: var(--usc-primary-dark);
  color: var(--usc-bg);
}
.home-cta .btn--ghost {
  background: transparent;
  color: var(--usc-primary-dark);
  border-color: var(--usc-primary-dark);
}
.home-cta .btn--ghost:hover {
  background: var(--usc-primary-dark);
  color: var(--usc-accent);
}

/* ===== Site Footer (深色 + 4 列) ===== */
.site-footer {
  background: var(--usc-bg-dark);
  color: rgba(255,255,255,0.7);
  padding: var(--usc-s-xxxxl) 0 var(--usc-s-m);
}
.site-footer__grid {
  max-width: var(--usc-container);
  margin: 0 auto;
  padding: 0 var(--usc-s-m);
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: var(--usc-s-l);
}
@media (max-width: 900px) { .site-footer__grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 600px) { .site-footer__grid { grid-template-columns: 1fr; } }

.site-footer h4 {
  color: var(--usc-bg);
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: var(--usc-s-s);
  letter-spacing: 0.04em;
}
.site-footer p {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.6);
  line-height: 1.7;
}
.site-footer a { color: rgba(255,255,255,0.7); }
.site-footer a:hover { color: var(--usc-accent); }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin-bottom: var(--usc-s-xs); }
.site-footer li a { font-size: 0.9rem; }

.site-footer__bottom {
  max-width: var(--usc-container);
  margin: var(--usc-s-l) auto 0;
  padding: var(--usc-s-m) var(--usc-s-m) 0;
  border-top: 1px solid rgba(255,255,255,0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--usc-s-s);
  font-size: 0.8rem;
  color: rgba(255,255,255,0.5);
}
.site-footer__bottom a { color: rgba(255,255,255,0.6); }
.site-footer__bottom a:hover { color: var(--usc-accent); }