/* =========================================================
   MPDD-AVG 2026 — Modern Academic Conference Theme
   Inspired by ACM, NeurIPS, CVPR & OpenAI Design Standards
   ========================================================= */

:root {
  /* 知性科技蓝主色调 */
  --primary:      #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #3b82f6;
  
  /* 现代化灰度系统 */
  --dark:         #1e293b;
  --mid:          #4b5563;
  --muted:        #6b7280;
  --light:        #f8fafc;
  --light-blue:   #eff6ff;
  --border:       #e2e8f0;
  --white:        #ffffff;
  
  /* 布局 */
  --max:          1200px;
  
  /* 高级弥散阴影系统 */
  --shadow-light: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-medium: 0 4px 6px rgba(0, 0, 0, 0.07), 0 10px 15px rgba(0, 0, 0, 0.1);
  --shadow-large: 0 10px 25px rgba(0, 0, 0, 0.1), 0 20px 40px rgba(0, 0, 0, 0.06);
  
  /* 现代过渡动画 */
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html { 
  scroll-behavior: smooth; 
  scroll-padding-top: 80px;
  width: 100%;
  overflow-x: hidden;
}

/* 现代无衬线字体系统 */
body {
  font-family: 'Inter', 'Source Sans 3', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--mid);
  background: var(--light);
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  width: 100%;
  overflow-x: hidden;
}
/* 现代化链接样式 */
a { 
  color: var(--primary); 
  text-decoration: none; 
  transition: var(--transition);
  font-weight: 500;
}
a:hover { 
  color: var(--primary-hover);
  text-decoration: none;
}

/* ── 现代化导航栏 ── */
header {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  position: sticky; 
  top: 0; 
  z-index: 100;
  box-shadow: var(--shadow-light);
}

.header-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 2rem;
  display: flex; 
  align-items: center;
  height: 64px;
}

.site-title {
  font-size: 1.25rem; 
  font-weight: 700;
  color: var(--dark);
  display: flex; 
  align-items: center;
  margin-right: 3rem;
  text-decoration: none;
  white-space: nowrap;
  flex-shrink: 0;
  letter-spacing: -0.025em;
}

nav { 
  display: flex; 
  align-items: center; 
  flex: 1; 
}

nav ul { 
  list-style: none; 
  display: flex; 
  align-items: center; 
  gap: 0; 
}

nav ul li { 
  position: relative; 
  display: flex; 
  align-items: center; 
}

nav ul li a {
  display: flex; 
  align-items: center;
  padding: 0 1.5rem;
  font-size: 0.95rem; 
  font-weight: 500;
  color: var(--mid);
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: var(--transition);
  white-space: nowrap;
}
nav ul li a:hover,
nav ul li a.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
  text-decoration: none;
}

/* 下拉菜单 */
nav ul li ul {
  display: none; 
  flex-direction: column;
  position: absolute; 
  top: 100%; 
  left: 0;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 8px;
  min-width: 260px;
  box-shadow: var(--shadow-medium);
  z-index: 200;
}

nav ul li:hover > ul { 
  display: flex; 
}

nav ul li ul li a {
  padding: 0.75rem 1.25rem;
  border-bottom: none;
  font-weight: 400;
  font-size: 0.9rem;
  border-left: 2px solid transparent;
}

nav ul li ul li a:hover {
  border-left-color: var(--primary);
  background: var(--light-blue);
  color: var(--primary);
}

.hamburger { 
  display: none; 
}

/* ── 现代化横幅 ── */
.banner {
  width: 100%;
  background-image: url('imgs/img.png');
  background-position: center;
  background-size: cover;
  background-repeat: no-repeat;
  background-color: #1e293b;
  padding: 6rem 2rem 5rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.banner::before {
  content: '';
  position: absolute; 
  inset: 0;
  background: transparent;
  display: none;
}
.banner-inner { 
  position: relative; 
  z-index: 1; 
  max-width: var(--max); 
  margin: 0 auto; 
}

.banner-tag {
  display: inline-block;
  background: var(--primary);
  color: #fff;
  font-size: 0.75rem; 
  font-weight: 600;
  letter-spacing: 0.05em; 
  text-transform: uppercase;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  margin-bottom: 1.5rem;
}

.banner h1 {
  font-family: inherit;
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800;
  color: #fff;
  line-height: 1.1;
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
}

.banner h1 .accent { 
  color: #60a5fa; 
}

.banner p {
  font-size: clamp(1.1rem, 2.5vw, 1.3rem);
  color: rgba(255,255,255,0.85);
  font-style: italic;
  font-weight: 400;
  max-width: 700px;
  margin: 0 auto 2.5rem;
  line-height: 1.6;
}

.banner-btns { 
  display: flex; 
  gap: 1rem; 
  justify-content: center; 
  flex-wrap: wrap; 
  margin-top: 1rem;
}

/* 现代化按钮 */
.btn {
  display: inline-block;
  padding: 0.875rem 2rem;
  font-size: 0.95rem; 
  font-weight: 600;
  letter-spacing: 0.01em;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  border-radius: 8px;
  border: 2px solid transparent;
}
.btn-primary { 
  background: var(--primary); 
  color: #fff; 
  box-shadow: var(--shadow-light);
}

.btn-primary:hover { 
  background: var(--primary-hover); 
  color: #fff; 
  text-decoration: none; 
  transform: translateY(-2px);
  box-shadow: var(--shadow-medium);
}

.btn-outline-white { 
  background: transparent; 
  border: 2px solid rgba(255,255,255,0.7); 
  color: #fff; 
}

.btn-outline-white:hover { 
  border-color: #fff; 
  background: rgba(255,255,255,0.15); 
  text-decoration: none; 
  color: #fff; 
  transform: translateY(-2px);
}

/* ── 主内容区域 ── */
.page-wrap {
  max-width: var(--max);
  width: 100%;
  margin: 0 auto;
  padding: 4rem 2rem 5rem;
  background: var(--white);
  box-shadow: var(--shadow-light);
  border-radius: 12px;
  margin-top: -3rem;
  position: relative;
  z-index: 10;
  box-sizing: border-box;
}

/* 引言块 - 移除红色边框 */
.intro-block {
  padding: 2rem;
  background: var(--light-blue);
  margin-bottom: 3rem;
  border-radius: 12px;
  border: 1px solid #dbeafe;
  position: relative;
}

.intro-block p {
  font-size: 1.125rem;
  color: var(--dark);
  line-height: 1.7;
  margin: 0;
  font-weight: 500;
}

/* 现代化标题 - 移除衬线字体 */
h2 {
  font-family: inherit;
  font-size: 1.875rem;
  font-weight: 700;
  color: var(--dark);
  margin: 3rem 0 1.5rem;
  letter-spacing: -0.025em;
}

h2:first-child { 
  margin-top: 0; 
}
h3 {
  font-size: 1.25rem; 
  font-weight: 600;
  color: var(--dark);
  margin: 2rem 0 0.75rem;
  letter-spacing: -0.015em;
}

p { 
  margin-bottom: 1.2rem; 
  color: var(--mid); 
  font-size: 1rem;
  line-height: 1.7;
}

p:last-child { 
  margin-bottom: 0; 
}

ul, ol { 
  padding-left: 1.6rem; 
  margin-bottom: 1.2rem; 
  color: var(--mid); 
}

li { 
  margin-bottom: 0.4rem; 
  line-height: 1.7;
}

strong { 
  color: var(--dark); 
  font-weight: 700;
}

/* ── 现代化卡片 - 移除顶部红色边框 ── */
.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin: 3rem 0;
}

.card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2rem;
  transition: var(--transition);
  box-shadow: var(--shadow-light);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-medium);
  border-color: var(--primary);
}

.card-icon { 
  font-size: 2.2rem; 
  margin-bottom: 1rem; 
  display: block;
  opacity: 0.8;
}

.card h3 { 
  font-size: 1.1rem; 
  font-weight: 700; 
  color: var(--dark); 
  margin: 0 0 0.8rem; 
  line-height: 1.3;
}

.card p { 
  font-size: 0.95rem; 
  color: var(--muted); 
  line-height: 1.6; 
  margin: 0; 
}
/* ── 现代化统计栏 ── */
.stats-bar {
  display: flex;
  border: 1px solid var(--border);
  margin: 3rem 0;
  background: var(--white);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow-light);
}

.stat-item {
  flex: 1; 
  text-align: center;
  padding: 2rem 0.8rem;
  border-right: 1px solid var(--border);
  transition: var(--transition);
  position: relative;
}

.stat-item:last-child { 
  border-right: none; 
}

.stat-item:hover {
  background: var(--light);
  transform: scale(1.05);
}

.stat-num {
  font-family: inherit;
  font-size: 2.25rem; 
  font-weight: 800;
  color: var(--primary); 
  line-height: 1;
  display: block;
  margin-bottom: 0.5rem;
  letter-spacing: -0.025em;
}

.stat-lbl {
  font-size: 0.8rem; 
  font-weight: 600;
  color: var(--muted); 
  text-transform: uppercase;
  letter-spacing: 0.08em;
  display: block;
}

/* ── 现代化表格 - 移除黑色表头 ── */
.dates-table {
  width: 100%; 
  border-collapse: collapse;
  margin: 2rem 0; 
  font-size: 1rem;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--shadow-light);
}

.dates-table th {
  text-align: left; 
  padding: 1rem 1.2rem;
  background: var(--light); 
  color: var(--dark);
  font-size: 0.9rem; 
  font-weight: 700;
  letter-spacing: 0.025em; 
  text-transform: uppercase;
  border-bottom: 2px solid var(--border);
}
.dates-table td {
  padding: 0.8rem 1.2rem;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
  background: var(--white);
}

.dates-table td:first-child { 
  color: var(--dark); 
  font-weight: 700; 
}

.dates-table td:last-child { 
  color: var(--muted); 
}

.dates-table tr:last-child td { 
  border-bottom: none; 
}

.dates-table tr:hover td { 
  background: var(--light); 
  transform: scale(1.01);
  transition: var(--transition);
}

/* ── 现代化比较表格 ── */
.compare-table {
  width: 100%;
  min-width: 700px;
  border-collapse: collapse;
  font-size: 0.9rem; 
  margin: 2rem 0;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--shadow-light);
}

.compare-table th {
  background: var(--light); 
  color: var(--dark);
  padding: 0.8rem 0.9rem;
  font-size: 0.8rem; 
  font-weight: 700;
  text-align: center; 
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 2px solid var(--border);
}

.compare-table th:first-child { 
  text-align: left; 
}

.compare-table td {
  padding: 0.7rem 0.9rem;
  border-bottom: 1px solid var(--border);
  text-align: center; 
  color: var(--muted);
  background: var(--white);
  transition: var(--transition);
}

.compare-table td:first-child { 
  text-align: left; 
  font-weight: 700; 
  color: var(--dark); 
}

.compare-table tr.ours td { 
  background: var(--light-blue); 
}

.compare-table tr.ours td:first-child { 
  color: var(--primary); 
  font-weight: 800; 
}
.compare-table tr:hover td { 
  background: var(--light); 
  transform: scale(1.01);
}

.compare-table tr.ours:hover td { 
  background: #dbeafe; 
}

.ck { 
  color: var(--primary); 
  font-weight: 700; 
}

.cx { 
  color: #d1d5db; 
}

/* ── 组织者网格 ── */
.org-section { 
  margin: 2rem 0 0.5rem; 
}

.org-label {
  font-size: 0.75rem; 
  font-weight: 700;
  letter-spacing: 0.1em; 
  text-transform: uppercase;
  color: var(--muted); 
  margin-bottom: 1rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border);
}

.org-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 1.5rem; 
  margin-bottom: 2rem;
}

.org-grid.org-grid-center {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: nowrap;
  grid-template-columns: none;
}

.org-grid-center {
  display: flex !important;
  flex-direction: row !important;
  justify-content: center;
  align-items: stretch;
  gap: 1.5rem;
  flex-wrap: nowrap !important;
  margin-bottom: 2rem;
}

.org-grid-center .org-card {
  width: 140px !important;
  flex-shrink: 0 !important;
  flex-grow: 0 !important;
  display: flex;
  flex-direction: column;
  min-height: 100%;
}

.org-card {
  text-align: center;
  padding: 1.5rem 0.8rem 1.2rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--white);
  transition: var(--transition);
  box-shadow: var(--shadow-light);
}

.org-card:hover { 
  box-shadow: var(--shadow-medium); 
  transform: translateY(-4px);
  border-color: var(--primary);
}

.org-pic {
  width: 80px; 
  height: 80px;
  border-radius: 50%;
  margin: 0 auto 0.8rem;
  overflow: hidden;
  border: 3px solid var(--border);
  background: var(--light);
  display: flex; 
  align-items: center; 
  justify-content: center;
  font-size: 0.9rem; 
  font-weight: 700; 
  color: var(--primary);
  transition: var(--transition);
}
.org-card:hover .org-pic {
  border-color: var(--primary);
  transform: scale(1.1);
}

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

.org-name { 
  font-size: 0.85rem; 
  font-weight: 700; 
  color: var(--dark); 
  line-height: 1.3; 
  margin-bottom: 0.3rem; 
}

.org-aff { 
  font-size: 0.75rem; 
  color: var(--muted); 
  line-height: 1.4; 
}

/* ── 注册步骤 ── */
.steps { 
  counter-reset: step; 
  display: flex; 
  flex-direction: column; 
  gap: 1.5rem; 
  margin: 1.5rem 0; 
}

.step {
  display: flex; 
  gap: 1.5rem;
  padding: 1.8rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--white);
  box-shadow: var(--shadow-light);
  transition: var(--transition);
}

.step:hover {
  transform: translateX(8px);
  box-shadow: var(--shadow-medium);
  border-color: var(--primary);
}

.step-num {
  font-family: inherit;
  font-size: 2.5rem; 
  font-weight: 800;
  color: rgba(37, 99, 235, 0.2);
  line-height: 1; 
  flex-shrink: 0; 
  width: 3rem;
}

.step-body h3 { 
  font-size: 1.1rem; 
  font-weight: 700; 
  color: var(--dark); 
  margin: 0 0 0.6rem; 
}
.step-body p { 
  font-size: 0.95rem; 
  color: var(--muted); 
  margin: 0 0 0.6rem; 
  line-height: 1.7; 
}

.step-body a { 
  color: var(--primary); 
  font-weight: 700; 
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: var(--transition);
}

.step-body a:hover {
  border-bottom-color: var(--primary);
}

/* ── 表单包装 ── */
.form-wrap {
  border: 1px solid var(--border);
  border-radius: 12px;
  margin: 2rem 0;
  background: var(--white);
  box-shadow: var(--shadow-light);
  overflow: hidden;
}

.form-header {
  padding: 1rem 1.5rem;
  background: var(--light);
  border-bottom: 1px solid var(--border);
  display: flex; 
  align-items: center; 
  justify-content: space-between;
  flex-wrap: wrap; 
  gap: 0.8rem;
}

.form-header span { 
  font-size: 0.9rem; 
  color: var(--muted); 
  font-weight: 500;
}

.form-header a { 
  font-size: 0.85rem; 
  font-weight: 700; 
  color: var(--primary); 
  text-decoration: none;
  padding: 0.3rem 0.6rem;
  border-radius: 4px;
  transition: var(--transition);
}

.form-header a:hover {
  background: var(--light-blue);
}

/* ── 规则 ── */
.rules { 
  display: grid; 
  grid-template-columns: 1fr 1fr; 
  gap: 0.6rem 2.5rem; 
  margin: 2rem 0; 
}
.rule { 
  font-size: 0.95rem; 
  color: var(--muted); 
  padding: 0.5rem 0; 
  border-bottom: 1px solid rgba(226, 232, 240, 0.5); 
  line-height: 1.6;
  transition: var(--transition);
}

.rule:nth-last-child(-n+2) { 
  border-bottom: none; 
}

.rule strong { 
  color: var(--dark); 
  font-weight: 700;
}

.rule:hover {
  color: var(--dark);
  padding-left: 0.5rem;
}

/* ── 引用框 ── */
.cite {
  background: var(--light);
  border-radius: 8px;
  padding: 1.2rem 1.5rem;
  font-size: 0.95rem; 
  color: var(--mid);
  margin: 2rem 0;
  box-shadow: var(--shadow-light);
  position: relative;
}

/* ── 通知 ── */
.notice {
  background: #fef3c7;
  border: 1px solid #fbbf24;
  border-radius: 8px;
  padding: 1rem 1.5rem;
  font-size: 0.95rem; 
  color: #92400e;
  margin: 1.5rem 0;
  box-shadow: var(--shadow-light);
}

/* ── 联系栏 ── */
.contact-bar {
  margin-top: 4rem;
  padding: 0;
  background: transparent;
  border-radius: 0;
  border: none;
  font-size: 0.95rem; 
  color: var(--mid);
  text-align: center;
  box-shadow: none;
}

.contact-bar a { 
  color: var(--primary); 
  font-weight: 700; 
  text-decoration: none;
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
  transition: var(--transition);
}
.contact-bar a:hover {
  background: rgba(37, 99, 235, 0.1);
  text-decoration: none;
}

/* ── 现代化页脚 ── */
footer {
  background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
  padding: 2rem 1.5rem;
  text-align: center;
  margin-top: 3rem;
}

footer p { 
  font-size: 0.85rem; 
  color: rgba(255,255,255,0.6); 
  margin: 0; 
  line-height: 1.6;
}

footer a { 
  color: rgba(255,255,255,0.8); 
  transition: var(--transition);
}

footer a:hover { 
  color: #fff; 
  text-decoration: none;
}

footer .red { 
  color: var(--primary); 
  font-weight: 700;
}

/* ── 工具类 ── */
.overflow-x { 
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 2rem -2rem;
  padding: 0 2rem;
}

@media (max-width: 768px) {
  .overflow-x {
    margin: 2rem -1rem;
    padding: 0 1rem;
  }
}

.mt-1 { 
  margin-top: 0.5rem; 
}

.mt-2 { 
  margin-top: 1rem; 
}

.mb-0 { 
  margin-bottom: 0; 
}

code {
  font-family: 'Source Code Pro', 'SF Mono', Monaco, 'Cascadia Code', monospace;
  font-size: 0.9em;
  background: var(--light);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.2em 0.5em;
  color: var(--primary);
  font-weight: 600;
}

/* ── 轨道表格 ── */
.tracks { 
  display: grid; 
  grid-template-columns: 1fr 1fr; 
  gap: 2rem; 
  margin: 3rem 0; 
}
.track-box {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.8rem;
  background: var(--white);
  box-shadow: var(--shadow-light);
  transition: var(--transition);
}

.track-box:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-medium);
  border-color: var(--primary);
}

.track-box h3 {
  color: var(--primary); 
  font-size: 1.1rem;
  font-weight: 700;
  margin: 0 0 0.8rem; 
  padding: 0;
}

.track-box p { 
  font-size: 0.95rem; 
  color: var(--muted); 
  margin: 0 0 1rem; 
  line-height: 1.6; 
}

.sub-list { 
  list-style: none; 
  padding: 0; 
}

.sub-list li {
  font-size: 0.9rem;
  padding: 0.5rem 0;
  border-bottom: 1px solid rgba(226, 232, 240, 0.5);
  color: var(--mid);
  transition: var(--transition);
}

.sub-list li:last-child { 
  border-bottom: none; 
}

.sub-list li:hover {
  color: var(--dark);
  padding-left: 0.5rem;
}

.sub-tag {
  display: inline-block;
  font-family: 'Source Code Pro', monospace;
  font-size: 0.8rem; 
  font-weight: 700;
  color: var(--primary);
  background: var(--light-blue);
  border: 1px solid #bfdbfe;
  border-radius: 4px;
  padding: 0.2rem 0.6rem;
  margin-right: 0.5rem;
}
/* ── 响应式设计 ── */
@media (max-width: 1024px) {
  .cards {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  body { 
    font-size: 15px; 
  }
  
  .header-inner { 
    position: relative; 
    padding: 0 1rem;
  }
  
  nav { 
    display: none; 
  }
  
  nav.open { 
    display: flex; 
    flex-direction: column; 
    position: absolute; 
    top: 64px; 
    left: 0; 
    right: 0; 
    background: rgba(255,255,255,0.98); 
    backdrop-filter: blur(20px); 
    border-bottom: 1px solid var(--border); 
    padding: 0.5rem 0; 
    z-index: 200; 
    box-shadow: var(--shadow-medium); 
  }
  
  nav.open ul { 
    flex-direction: column; 
  }
  
  nav.open ul li a { 
    padding: 0.8rem 1.5rem; 
    border-bottom: 1px solid var(--border) !important; 
    border-left: none; 
    font-size: 1rem; 
  }
  
  nav ul li ul { 
    position: static; 
    border: none; 
    box-shadow: none; 
    padding-left: 1rem; 
  }
  
  .hamburger { 
    display: flex; 
    flex-direction: column; 
    gap: 5px; 
    cursor: pointer; 
    background: none; 
    border: none; 
    margin-left: auto; 
    padding: 4px; 
  }
  
  .hamburger span { 
    display: block; 
    width: 22px; 
    height: 2px; 
    background: var(--dark); 
    border-radius: 2px; 
    transition: var(--transition); 
  }
  
  .banner { 
    padding: 4rem 1rem 3rem; 
  }
  .page-wrap { 
    padding: 2rem 1rem 3rem; 
    margin-top: -2rem; 
  }
  
  .cards { 
    grid-template-columns: 1fr; 
    gap: 1.2rem; 
  }
  
  .tracks { 
    grid-template-columns: 1fr; 
  }
  
  .rules { 
    grid-template-columns: 1fr; 
  }
  
  .stats-bar { 
    flex-wrap: wrap; 
  }
  
  .stat-item { 
    min-width: 50%; 
    border-right: none; 
    border-bottom: 1px solid var(--border); 
    padding: 1.5rem 0.5rem; 
  }
  
  .stat-item:nth-child(odd):last-child { 
    border-bottom: none; 
  }
  
  .org-grid { 
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); 
  }
  
  h2 { 
    font-size: 1.5rem; 
    margin: 2rem 0 1rem; 
  }
  
  h3 { 
    font-size: 1.1rem; 
  }
  
  .intro-block { 
    padding: 1.5rem; 
    margin-bottom: 2rem; 
  }
  
  .intro-block p { 
    font-size: 1.05rem; 
  }
  
  .banner-btns {
    flex-direction: column;
    align-items: center;
  }
  
  .btn {
    min-width: 200px;
    text-align: center;
  }
}

/* ── 现代化选择样式 ── */
::selection {
  background: rgba(37, 99, 235, 0.2);
  color: var(--dark);
}

/* ── 焦点状态 ── */
a:focus,
button:focus,
.btn:focus {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}