/* ===== CSS Variables — Light Theme ===== */
:root {
  --bg-primary: #f5f7f9;
  --bg-secondary: #eef1f5;
  --bg-card: #ffffff;
  --bg-card-hover: #f8f9fb;
  --text-primary: #1a1a2e;
  --text-secondary: #4a5568;
  --text-muted: #8896a4;
  --accent-blue: #003153;
  --accent-blue-light: #1a5276;
  --accent-orange: #e87722;
  --accent-orange-hover: #d4651a;
  --accent-orange-light: rgba(232,119,34,.08);
  --border: #e2e8f0;
  --border-light: #edf2f7;
  --radius: 8px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --transition: 0.3s ease;
  --max-width: 1200px;
  --header-height: 72px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,.08);
  --shadow-lg: 0 8px 30px rgba(0,0,0,.1);
}

/* ===== Reset & Base ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:var(--header-height)}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  background:var(--bg-primary);
  color:var(--text-primary);
  line-height:1.7;-webkit-font-smoothing:antialiased;overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}

/* ===== Shared Components ===== */
.container{width:100%;max-width:var(--max-width);margin:0 auto;padding:0 24px}
.section{padding:80px 0;position:relative}
.section-alt{background:var(--bg-secondary)}
.section-bg{background:var(--bg-secondary)}
.section-label{
  display:inline-flex;align-items:center;gap:10px;
  font-size:15px;font-weight:600;letter-spacing:3px;text-transform:uppercase;
  color:var(--accent-orange);margin-bottom:16px;
}
.section-label::before{content:'';display:block;width:24px;height:1px;background:var(--accent-orange)}
.section-title{
  font-size:clamp(28px,5vw,48px);font-weight:700;letter-spacing:-1px;line-height:1.2;margin-bottom:16px;color:var(--text-primary);
}
.section-subtitle{font-size:18px;color:var(--text-secondary);max-width:600px;line-height:1.8}
.text-center{text-align:center}
.section-header{margin-bottom:60px}
.section-header .section-subtitle{margin:0 auto}

/* ===== Page Banner (with background image support) ===== */
.page-banner{
  margin-top:var(--header-height);
  min-height:260px;display:flex;align-items:center;justify-content:center;padding:40px 0;
  background:linear-gradient(135deg, #003153 0%, #1a5276 50%, #0d1b36 100%);
  text-align:center;position:relative;overflow:hidden;color:#fff;
}
/* Banner背景图片层 */
.page-banner-bg{
  position:absolute;top:0;left:0;width:100%;height:100%;
  object-fit:cover;z-index:0;
}
/* Banner渐变叠加层（保证文字可读性） */
.page-banner-overlay{
  position:absolute;top:0;left:0;width:100%;height:100%;
  background:linear-gradient(135deg, rgba(0,49,83,0.75) 0%, rgba(26,82,118,0.65) 50%, rgba(13,27,54,0.75) 100%);
  z-index:1;
}
.page-banner .container{position:relative;z-index:2}
.page-banner::after{
  content:'';position:absolute;bottom:0;left:0;right:0;height:1px;z-index:2;
  background:linear-gradient(90deg,transparent,rgba(255,255,255,.15),transparent);
}
.page-banner .section-title{color:#fff}
.page-banner .section-subtitle{color:rgba(255,255,255,.7)}
.page-banner .section-label{color:#fff}
.page-banner .section-label::before{background:#fff}

/* ===== Buttons ===== */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:12px 28px;border-radius:100px;font-size:15px;font-weight:600;
  cursor:pointer;border:none;transition:all var(--transition);white-space:nowrap;
}
.btn-lg{padding:14px 36px;font-size:16px}
.btn-sm{padding:8px 20px;font-size:15px}
.btn-primary{
  background:var(--accent-orange);color:#fff;text-shadow:0 1px 2px rgba(0,0,0,.15);
}
.btn-primary:hover{background:var(--accent-orange-hover);transform:translateY(-2px);box-shadow:0 6px 20px rgba(232,119,34,.25)}
.btn-outline{
  background:transparent;color:var(--text-primary);border:1px solid var(--border);
}
.btn-outline:hover{border-color:var(--text-muted);background:var(--bg-secondary)}
.btn-ghost{
  background:transparent;color:var(--accent-orange);border:1px solid transparent;
}
.btn-ghost:hover{background:var(--accent-orange-light)}

/* ===== Cards ===== */
.card{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius-lg);transition:all var(--transition);overflow:hidden;
  position:relative;box-shadow:var(--shadow-sm);
}
.card:hover{background:var(--bg-card-hover);border-color:var(--border);transform:translateY(-2px);box-shadow:var(--shadow-md)}
.card-body{padding:28px}

/* ===== Placeholder Image ===== */
.placeholder-img{
  background:var(--bg-secondary);
  display:flex;align-items:center;justify-content:center;
  position:relative;overflow:hidden;
  color:var(--text-muted);
  font-size:14px;
}
/* placeholder-img ::before removed - no emoji on frontend */
.placeholder-img-inner{
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  padding:20px;
  text-align:center;
}
.placeholder-img-inner .icon{display:none}
.placeholder-img-inner .text{display:none}

/* ===== Section Divider ===== */
.section-divider{
  width:40px;height:3px;background:var(--accent-orange);border-radius:2px;
  margin:0 auto 60px;opacity:.5;
}

/* ===== Header ===== */
.header{
  position:fixed;top:0;left:0;right:0;height:var(--header-height);
  background:rgba(255,255,255,.92);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);
  border-bottom:1px solid var(--border);z-index:1000;transition:all var(--transition);
}
.header.scrolled{background:rgba(255,255,255,.98);box-shadow:var(--shadow-sm)}
.header .container{height:100%;display:flex;align-items:center;justify-content:space-between}
.logo{display:flex;align-items:center;gap:10px}
.logo-icon{
  width:40px;height:40px;background:var(--accent-blue);border-radius:var(--radius);
  display:flex;align-items:center;justify-content:center;color:#fff;font-size:18px;font-weight:800;letter-spacing:-1px;
}
.logo-text{font-size:18px;font-weight:700;color:var(--text-primary);letter-spacing:1px}
.logo-text span{font-weight:400;color:var(--text-secondary);font-size:14px;display:block;letter-spacing:2px}
.logo-img{height:40px;width:auto;display:block}
.footer-logo-img{height:36px;width:auto;display:block;filter:brightness(0) invert(1)}
.nav{display:flex;align-items:center;gap:2px}
.nav a{
  color:var(--text-secondary);font-size:16px;font-weight:500;padding:8px 16px;border-radius:var(--radius);transition:all var(--transition);
}
.nav a:hover{color:var(--text-primary);background:var(--bg-secondary)}
.nav a.active{color:var(--accent-blue);background:rgba(0,49,83,.06);font-weight:600}

/* ===== Nav Dropdown ===== */
.nav-dropdown{position:relative}
.nav-dropdown-trigger{cursor:pointer;display:flex;align-items:center;gap:2px}
.dropdown-arrow{font-size:12px;opacity:.6;transition:all var(--transition)}
.nav-dropdown:hover .dropdown-arrow{opacity:1;transform:rotate(0deg)}
.nav-dropdown.active .nav-dropdown-trigger{color:var(--accent-blue);font-weight:600}
.nav-dropdown-menu{
  position:absolute;top:100%;left:0;
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius);box-shadow:var(--shadow-md);
  padding:8px;min-width:160px;z-index:100;
  opacity:0;visibility:hidden;transform:translateY(8px);
  transition:all .25s ease;
}
.nav-dropdown:hover .nav-dropdown-menu{
  opacity:1;visibility:visible;transform:translateY(0);
}
.nav-dropdown-menu a{
  display:block;padding:10px 16px;font-size:15px;font-weight:400;
  color:var(--text-secondary);border-radius:var(--radius);
  transition:all var(--transition);white-space:nowrap;
}
.nav-dropdown-menu a:hover{background:var(--bg-secondary);color:var(--accent-blue)}

.nav .btn-cta{
  background:var(--accent-orange);color:#fff;font-weight:700;margin-left:12px;padding:10px 24px;
  border-radius:100px;text-shadow:0 1px 2px rgba(0,0,0,.15);
}
.nav .btn-cta:hover{background:var(--accent-orange-hover);transform:translateY(-1px)}
.mobile-menu-btn{display:none;background:none;border:none;color:var(--text-primary);cursor:pointer;padding:8px;font-size:22px}

/* ===== Footer ===== */
.footer{
  background:var(--accent-blue);color:#fff;padding:60px 0 30px;
}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:60px;margin-bottom:48px}
.footer-logo{display:flex;align-items:center;gap:10px}
.footer-logo .logo-icon{background:rgba(255,255,255,.15);border-radius:var(--radius)}
.footer-logo span{font-size:16px;font-weight:600}
.footer-logo .logo-text{color:#fff}
.footer-desc{color:rgba(255,255,255,.6);font-size:14px;line-height:1.8;max-width:280px;margin-top:16px}
.footer-col-title{font-size:14px;font-weight:600;color:#fff;margin-bottom:16px;text-transform:uppercase;letter-spacing:1px}
.footer-col a,.footer-links a{display:block;color:rgba(255,255,255,.6);font-size:14px;margin-bottom:10px;transition:all var(--transition)}
.footer-col a:hover,.footer-links a:hover{color:#fff}
.footer-links h4{font-size:14px;font-weight:600;color:#fff;margin-bottom:16px;text-transform:uppercase;letter-spacing:1px}
.footer-contact h4{font-size:14px;font-weight:600;color:#fff;margin-bottom:16px;text-transform:uppercase;letter-spacing:1px}
.footer-contact p{color:rgba(255,255,255,.6);font-size:14px;margin-bottom:8px}
.footer-bottom{
  display:flex;justify-content:space-between;align-items:center;
  padding-top:24px;border-top:1px solid rgba(255,255,255,.15);
  font-size:14px;color:rgba(255,255,255,.5);
}
.footer-bottom a{color:rgba(255,255,255,.5)}.footer-bottom a:hover{color:rgba(255,255,255,.8)}

/* ===== Hero (with background image support) ===== */
.hero{
  min-height:560px;display:flex;align-items:center;
  background:linear-gradient(135deg, #003153 0%, #1a5276 40%, #2c3e50 100%);
  color:#fff;padding:100px 0 60px;margin-top:var(--header-height);
  position:relative;overflow:hidden;
}
/* Hero背景图片层 */
.hero-bg{
  position:absolute;top:0;left:0;width:100%;height:100%;
  object-fit:cover;z-index:0;
}
/* Hero渐变叠加层（保证文字可读性） */
.hero-overlay{
  position:absolute;top:0;left:0;width:100%;height:100%;
  background:linear-gradient(135deg, rgba(0,49,83,0.82) 0%, rgba(26,82,118,0.72) 40%, rgba(44,62,80,0.75) 100%);
  z-index:1;
}
.hero::after{
  content:'';position:absolute;top:0;right:0;width:50%;height:100%;z-index:1;
  background:radial-gradient(circle at 70% 50%, rgba(232,119,34,.15) 0%, transparent 60%);
}
.hero .container{position:relative;z-index:2}
.hero-title{font-size:clamp(32px,6vw,56px);font-weight:700;line-height:1.15;margin-bottom:24px;letter-spacing:-1px}
.hero-subtitle{font-size:clamp(16px,2.5vw,20px);color:rgba(255,255,255,.75);line-height:1.6;max-width:560px;margin-bottom:40px}
.hero-stats{
  display:grid;grid-template-columns:repeat(4,1fr);gap:24px;
  max-width:600px;margin-bottom:40px;
}
.hero-stat{text-align:center;padding:16px;background:rgba(255,255,255,.1);border-radius:var(--radius);border:1px solid rgba(255,255,255,.15)}
.hero-stat-value{font-size:clamp(20px,3vw,32px);font-weight:700;color:#fff;display:block}
.hero-stat-label{font-size:14px;color:rgba(255,255,255,.6);letter-spacing:1px;text-transform:uppercase}
.hero-cta{display:flex;gap:12px;flex-wrap:wrap}
.hero-cta .btn-outline{color:#fff;border-color:rgba(255,255,255,.3)}
.hero-cta .btn-outline:hover{background:rgba(255,255,255,.1);border-color:rgba(255,255,255,.5)}

/* ===== Courses Grid ===== */
.courses-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.course-card{display:flex;flex-direction:column}
.course-card.featured{border:2px solid rgba(232,119,34,.2);grid-column:span 2}.course-card.featured .course-card-image{height:300px}
.course-card-image{
  height:180px;display:flex;align-items:center;justify-content:center;
  background:var(--bg-secondary);overflow:hidden;
}
.course-badge{
  position:absolute;top:12px;left:12px;
  background:var(--accent-orange);color:#fff;
  padding:4px 12px;border-radius:100px;font-size:14px;font-weight:600;
}
.course-card-name{font-size:18px;font-weight:600;margin-bottom:4px}
.course-card-age{font-size:15px;color:var(--text-muted);margin-bottom:8px}
.course-card-desc{font-size:14px;color:var(--text-secondary);line-height:1.6}
.course-card-footer{
  display:flex;justify-content:space-between;align-items:center;
  margin-top:16px;padding-top:16px;border-top:1px solid var(--border-light);
}
.course-card-price{font-size:15px;font-weight:600;color:var(--accent-orange)}
.course-card-arrow{font-size:15px;color:var(--accent-orange);font-weight:500}

/* ===== News Grid ===== */
.news-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:24px}
.news-card{display:flex;flex-direction:column}
.news-card-image{
  height:180px;display:flex;align-items:center;justify-content:center;
  background:var(--bg-secondary);overflow:hidden;
}
.news-card-date{font-size:14px;color:var(--text-muted);margin-bottom:8px}
.news-card-title{font-size:16px;font-weight:600;margin-bottom:8px;line-height:1.4}
.news-card-summary{font-size:14px;color:var(--text-secondary);line-height:1.6}
.read-more{font-size:15px;color:var(--accent-orange);font-weight:500;margin-top:12px}

/* ===== Features Grid ===== */
.features-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.feature-card{
  padding:32px;background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);
  transition:all var(--transition);
}
.feature-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-md)}
.feature-icon{font-size:36px;margin-bottom:16px}
.feature-card h3{font-size:16px;font-weight:600;margin-bottom:8px}
.feature-card p{font-size:14px;color:var(--text-secondary);line-height:1.6}

/* ===== Stat Card ===== */
.stat-card{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius-lg);padding:24px;text-align:center;
  box-shadow:var(--shadow-sm);
}
.stat-card-value{font-size:28px;font-weight:700;color:var(--accent-orange)}
.stat-card-label{font-size:15px;color:var(--text-muted);margin-top:4px}

/* ===== Team Grid ===== */
.team-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:24px}
.team-card{display:flex;flex-direction:column}
.team-avatar{
  height:220px;display:flex;align-items:center;justify-content:center;
  background:var(--bg-secondary);overflow:hidden;
}
.team-avatar img{width:100%;height:100%;object-fit:cover}
.team-name{font-size:18px;font-weight:600;margin-bottom:4px}
.team-title{font-size:14px;color:var(--accent-orange);margin-bottom:8px}
.team-bio{font-size:14px;color:var(--text-secondary);line-height:1.6}

/* ===== Campus Card ===== */
.campus-card{display:flex;flex-direction:column}
.campus-card-image{
  height:180px;display:flex;align-items:center;justify-content:center;
  background:var(--bg-secondary);overflow:hidden;
}
.campus-name{font-size:18px;font-weight:600;margin-bottom:16px}
.campus-info{display:flex;flex-direction:column;gap:12px}
.campus-info-item{display:flex;gap:8px}
.campus-info-label{font-size:15px;color:var(--text-muted);min-width:40px;font-weight:500}
.campus-info-value{font-size:14px;color:var(--text-secondary)}

/* ===== Case Card ===== */
.case-card{display:flex;flex-direction:column}
.case-card-image{
  height:200px;display:flex;align-items:center;justify-content:center;
  background:var(--bg-secondary);overflow:hidden;
}

/* ===== Tab Navigation ===== */
.tab-nav{display:flex;justify-content:center;gap:8px;margin-bottom:48px}
.tab-btn{
  padding:10px 24px;border-radius:100px;font-size:14px;font-weight:600;
  border:1px solid var(--border);background:var(--bg-card);color:var(--text-secondary);
  cursor:pointer;transition:all var(--transition);
}
.tab-btn.active{background:var(--accent-orange);color:#fff;border-color:var(--accent-orange)}
.tab-btn:hover:not(.active){background:var(--bg-secondary);color:var(--text-primary)}

/* ===== Philosophy Card ===== */
.philosophy-card{border-left:3px solid var(--accent-orange)}

/* ===== Honor Card ===== */
.honor-card{text-align:center}
.honor-card h3{color:var(--accent-orange);font-size:20px;font-weight:700}
.honor-card p{color:var(--text-secondary);margin-top:8px;font-size:14px}

/* ===== Info Box (Course Detail) ===== */
.info-box{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius-lg);padding:28px;margin-bottom:48px;
  box-shadow:var(--shadow-sm);
}
.info-box-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:20px;text-align:center}
.info-box-item{padding:16px}
.info-box-item.highlight{background:var(--accent-orange-light);border-radius:var(--radius)}
.info-box-label{font-size:14px;color:var(--text-muted);letter-spacing:1px;text-transform:uppercase}
.info-box-value{font-size:18px;font-weight:600;color:var(--text-primary);margin-top:4px}
.info-box-value.big{font-size:28px;color:var(--accent-orange)}

/* ===== FAQ ===== */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius-lg);margin-bottom:12px;overflow:hidden;transition:all var(--transition);
  box-shadow:var(--shadow-sm);
}
.faq-item:hover{border-color:var(--border)}
.faq-item.open{border-color:rgba(232,119,34,.3);box-shadow:var(--shadow-md)}
.faq-question{
  display:flex;justify-content:space-between;align-items:center;
  width:100%;padding:20px 24px;background:none;border:none;color:var(--text-primary);
  font-size:16px;font-weight:500;cursor:pointer;text-align:left;font-family:inherit;
  line-height:1.5;gap:16px;
}
.faq-question:hover{color:var(--accent-orange)}
.faq-arrow{
  flex-shrink:0;width:24px;height:24px;display:flex;align-items:center;justify-content:center;
  border-radius:50%;border:1px solid var(--border);transition:all var(--transition);font-size:12px;color:var(--text-muted);
}
.faq-item.open .faq-arrow{transform:rotate(45deg);border-color:var(--accent-orange);color:var(--accent-orange)}
.faq-answer{
  max-height:0;overflow:hidden;transition:max-height .4s ease,padding .4s ease;
}
.faq-item.open .faq-answer{max-height:500px}
.faq-answer-inner{
  padding:0 24px 20px;font-size:15px;color:var(--text-secondary);line-height:1.9;
}

/* ===== Structured Summary ===== */
.summary-box{
  background:var(--bg-card);border:1px solid rgba(232,119,34,.15);
  border-radius:var(--radius-lg);padding:28px 32px;margin-bottom:48px;
  box-shadow:var(--shadow-sm);
}
.summary-box-title{
  font-size:15px;font-weight:600;letter-spacing:2px;text-transform:uppercase;color:var(--accent-orange);margin-bottom:16px;
}
.summary-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:16px}
.summary-item{display:flex;flex-direction:column;gap:4px}
.summary-item-label{font-size:14px;color:var(--text-muted);text-transform:uppercase;letter-spacing:1px}
.summary-item-value{font-size:15px;font-weight:500;color:var(--text-primary)}

/* ===== Related Links ===== */
.related-section{margin-top:60px}
.related-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:16px}
.related-card{
  display:flex;flex-direction:column;gap:8px;padding:24px;
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius-lg);transition:all var(--transition);
  box-shadow:var(--shadow-sm);text-decoration:none;color:inherit;
}
.related-card:hover{background:var(--bg-card-hover);border-color:var(--accent-orange);transform:translateY(-2px);box-shadow:var(--shadow-md)}
.related-card-arrow{color:var(--accent-orange);font-size:15px;font-weight:500}

/* ===== Timeline ===== */
.timeline{max-width:800px;margin:0 auto;position:relative;padding-left:32px}
.timeline::before{content:'';position:absolute;left:7px;top:8px;bottom:8px;width:2px;background:var(--border)}
.timeline-item{position:relative;margin-bottom:24px}
.timeline-dot{
  position:absolute;left:-32px;top:24px;width:16px;height:16px;
  border-radius:50%;background:var(--bg-card);border:2px solid var(--border);
  z-index:1;transition:all var(--transition);
}
.timeline-dot.highlight{border-color:var(--accent-orange);background:var(--accent-orange);box-shadow:0 0 0 4px rgba(232,119,34,.15)}
.timeline-item.highlight .timeline-content{border-color:rgba(232,119,34,.2)}
.timeline-year{display:inline-block;font-size:15px;font-weight:600;color:var(--accent-orange);margin-bottom:4px;letter-spacing:1px}
.timeline-month{display:inline-block;font-size:15px;font-weight:600;color:var(--accent-orange);margin-bottom:4px;letter-spacing:1px}
.timeline-phase{font-size:18px;font-weight:600;color:var(--text-primary);margin-bottom:8px}
.timeline-desc{font-size:14px;color:var(--text-secondary);line-height:1.7}
.timeline-content{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-sm)}

/* ===== FAQ Nav (FAQ page category quick links) ===== */
.faq-nav .btn-sm:hover{border-color:var(--accent-orange);color:var(--accent-orange)}

/* ===== Article Detail ===== */
.article-meta{display:flex;gap:12px;align-items:center;margin-bottom:16px}
.article-category{
  display:inline-block;padding:4px 12px;background:var(--accent-orange-light);
  color:var(--accent-orange);font-size:14px;font-weight:600;border-radius:100px;
}
.article-date{font-size:14px;color:var(--text-muted)}
.article-title{font-size:clamp(24px,4vw,36px);font-weight:700;line-height:1.3}

/* ===== Pagination ===== */
.page-btn{
  display:inline-flex;align-items:center;justify-content:center;
  width:40px;height:40px;border-radius:var(--radius);
  border:1px solid var(--border);background:var(--bg-card);color:var(--text-secondary);
  font-size:14px;font-weight:500;transition:all var(--transition);margin:0 4px;
}
.page-btn.active{background:var(--accent-orange);color:#fff;border-color:var(--accent-orange)}
.page-btn:hover:not(.active){background:var(--bg-secondary);color:var(--text-primary)}

/* ===== Contact Form ===== */
.form-group{margin-bottom:20px}
.form-label{display:block;font-size:14px;font-weight:500;margin-bottom:8px;color:var(--text-secondary)}
.form-input,.form-select,.form-textarea{
  width:100%;padding:12px 16px;background:var(--bg-card);
  border:1px solid var(--border);border-radius:var(--radius);
  color:var(--text-primary);font-size:15px;transition:all var(--transition);font-family:inherit;
}
.form-input:focus,.form-select:focus,.form-textarea:focus{
  outline:none;border-color:var(--accent-orange);box-shadow:0 0 0 3px rgba(232,119,34,.1);
}
.form-textarea{min-height:120px;resize:vertical}
.form-select{appearance:none;cursor:pointer}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.form-submit{
  width:100%;padding:16px;background:var(--accent-orange);color:#fff;border:none;
  border-radius:var(--radius);font-size:16px;font-weight:600;cursor:pointer;transition:all var(--transition);
}
.form-submit:hover{background:var(--accent-orange-hover)}
.contact-form-card{box-shadow:var(--shadow-md)}

/* ===== About Stats ===== */
.about-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:60px}

/* ===== Stats Strip (Cases page) ===== */
.stats-strip{
  display:grid;grid-template-columns:repeat(4,1fr);gap:0;
  margin-bottom:60px;background:var(--bg-card);border-radius:var(--radius-lg);
  overflow:hidden;border:1px solid var(--border);box-shadow:var(--shadow-sm);
}
.stats-strip > div{padding:28px;text-align:center;border-right:1px solid var(--border-light)}
.stats-strip > div:last-child{border-right:none}
.stats-strip .big{font-size:36px;font-weight:700;color:var(--accent-orange)}
.stats-strip .label{font-size:15px;color:var(--text-muted)}

/* ===== Campuses List ===== */
.campuses-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:24px}

/* ===== Env Grid ===== */
.env-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.env-card{text-align:center}
.env-card-img{
  height:180px;display:flex;align-items:center;justify-content:center;
  background:var(--bg-secondary);
}
.env-card h4{font-size:15px;font-weight:600;margin-top:4px}
.env-card p{font-size:15px;color:var(--text-muted)}

/* ===== Mobile Menu ===== */
.mobile-menu{
  position:fixed;top:0;left:0;right:0;bottom:0;background:rgba(255,255,255,.98);
  z-index:1001;display:none;overflow-y:auto;
}
.mobile-menu.active{display:block}
.mobile-menu-inner{
  padding:24px;display:flex;flex-direction:column;gap:8px;
}
.mobile-menu-close{
  background:none;border:none;font-size:24px;color:var(--text-primary);
  cursor:pointer;padding:8px;align-self:flex-end;
}
.mobile-menu-inner a{
  font-size:16px;padding:12px;color:var(--text-secondary);
  border-radius:var(--radius);transition:all var(--transition);
}
.mobile-menu-inner a:hover{background:var(--bg-secondary);color:var(--text-primary)}
.mobile-main-link{font-weight:600;color:var(--text-primary)}
.mobile-menu-group{margin:4px 0 8px;padding-left:16px;border-left:2px solid var(--border)}
.mobile-group-title{font-size:14px;font-weight:600;color:var(--accent-orange);padding:4px 0;display:block;letter-spacing:1px}
.mobile-menu-group a{font-size:15px;padding:8px 12px;color:var(--text-muted)}

/* ===== Back to Top ===== */
.back-to-top{
  position:fixed;bottom:32px;right:32px;
  width:44px;height:44px;background:var(--bg-card);border:1px solid var(--border);
  border-radius:50%;display:flex;align-items:center;justify-content:center;
  color:var(--text-secondary);cursor:pointer;z-index:99;opacity:0;transform:translateY(20px);
  transition:all var(--transition);font-size:18px;box-shadow:var(--shadow-md);
}
.back-to-top.visible{opacity:1;transform:translateY(0)}
.back-to-top:hover{background:var(--accent-orange);color:#fff;border-color:var(--accent-orange)}

/* ===== Scrollbar ===== */
::-webkit-scrollbar{width:8px}
::-webkit-scrollbar-track{background:var(--bg-primary)}
::-webkit-scrollbar-thumb{background:var(--border);border-radius:4px}
::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}

/* ===== Fade-in ===== */
.fade-in{opacity:0;transform:translateY(30px);transition:opacity .8s ease,transform .8s ease}
.fade-in.visible{opacity:1;transform:translateY(0)}

/* ===== Breadcrumb ===== */
.breadcrumb{display:flex;gap:8px;align-items:center;font-size:14px;color:var(--text-muted);margin-bottom:24px;flex-wrap:wrap}
.breadcrumb a{color:var(--text-muted);transition:color var(--transition)}
.breadcrumb a:hover{color:var(--text-primary)}
.breadcrumb .sep{color:var(--text-muted)}
.breadcrumb [aria-current="page"]{color:var(--text-primary)}

/* 深色 banner 上的面包屑需要白色 */
.page-banner .breadcrumb{color:rgba(255,255,255,.6);margin-bottom:16px}
.page-banner .breadcrumb a{color:rgba(255,255,255,.7)}
.page-banner .breadcrumb a:hover{color:#fff}
.page-banner .breadcrumb .sep{color:rgba(255,255,255,.4)}
.page-banner .breadcrumb [aria-current="page"]{color:rgba(255,255,255,.9)}

/* ===== Skip to content (accessibility) ===== */
.skip-link{
  position:absolute;top:-100px;left:24px;z-index:9999;
  background:var(--accent-orange);color:#fff;padding:12px 20px;border-radius:var(--radius);
  font-size:14px;font-weight:600;transition:top .3s;
}
.skip-link:focus{top:16px}

/* ===== Responsive ===== */
@media(max-width:1024px){
  .footer-grid{grid-template-columns:1fr 1fr}
  .features-grid{grid-template-columns:1fr 1fr}
  .about-stats{grid-template-columns:1fr 1fr}
  .hero-stats{grid-template-columns:1fr 1fr}
  .stats-strip{grid-template-columns:1fr 1fr}
  .env-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:768px){
  .section{padding:60px 0}
  .nav{display:none}
  .mobile-menu-btn{display:block}
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column;gap:12px;text-align:center}
  .form-row{grid-template-columns:1fr}
  .page-banner{min-height:200px;padding:30px 0}
  .hero{min-height:auto;padding:80px 0 40px}
  .hero-stats{grid-template-columns:1fr 1fr}
  .features-grid{grid-template-columns:1fr 1fr}
  .about-stats{grid-template-columns:1fr 1fr}
  .stats-strip{grid-template-columns:1fr 1fr}
  .env-grid{grid-template-columns:1fr}
  .contact-layout{grid-template-columns:1fr!important}
}
@media(max-width:480px){
  .section-title{font-size:28px;letter-spacing:-.5px}
  .summary-grid{grid-template-columns:1fr 1fr}
  .related-grid{grid-template-columns:1fr}
  .features-grid{grid-template-columns:1fr}
  .about-stats{grid-template-columns:1fr 1fr}
  .hero-stats{grid-template-columns:1fr 1fr}
  .hero-cta{flex-direction:column}
  .hero-cta .btn{width:100%;justify-content:center}
}

/* ===== 移动端课程网格 ===== */
@media(max-width:768px){
  .courses-grid{grid-template-columns:1fr}
  .course-card.featured{grid-column:span 1}
  .course-card.featured .course-card-image{height:180px}
}
@media(min-width:769px) and (max-width:1024px){
  .courses-grid{grid-template-columns:repeat(2,1fr)}
  .course-card.featured{grid-column:span 2}
}