/* 企业级专业设计样式表 - 扁平化、层次感、呼吸感 */

:root {
  /* 品牌色系 - 水动力科研社：深海蓝与极光青 */
  --primary-color: #003366;    /* 深海蓝 */
  --primary-light: #004d99;
  --primary-dark: #002244;
  --accent-color: #00f2fe;     /* 极光青 */
  --accent-hover: #00d8e4;
  
  /* 辅助色系 */
  --secondary-color: #64748b;
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --danger-color: #ef4444;
  
  /* 背景与中性色 */
  --bg-light: #f8fafc;
  --bg-white: #ffffff;
  --bg-section: #f1f5f9;
  --bg-dark: #0f172a;          /* 深蓝背景 */
  --text-main: #1e293b;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  
  /* 边框与阴影 */
  --border-color: #e2e8f0;
  --shadow-flat: 0 1px 3px rgba(0,0,0,0.05);
  --shadow-breath: 0 10px 40px rgba(0,0,0,0.08);
  --shadow-glow: 0 0 15px rgba(0, 242, 254, 0.3); /* 极光青发光 */
  
  /* 间距系统 - 增强呼吸感 */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 6rem;
  
  --container-max: 1200px;
  --transition-base: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body {
  overflow-x: hidden;
  padding-top: 70px;
}

body {
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  color: var(--text-main);
  background-color: var(--bg-white);
  line-height: 1.7;
}

/* 选中文字样式 - 使用高对比度 */
::selection {
  background-color: var(--accent-color);
  color: var(--primary-dark);
}

::-moz-selection {
  background-color: var(--accent-color);
  color: var(--primary-dark);
}

/* ==================== 排版 ==================== */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  margin-bottom: 1rem;
  line-height: 1.25;
  color: var(--text-main);
}

h1 { font-size: 3rem; letter-spacing: -0.02em; }
h2 { font-size: 2.25rem; position: relative; padding-bottom: 0.75rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.25rem; }

/* 扁平化的标题下划线装饰 */
.section-title {
  text-align: center;
  margin-bottom: var(--space-lg);
}

.section-title::after {
  content: '';
  display: block;
  width: 40px;
  height: 3px;
  background: var(--primary-color);
  margin: 1.5rem auto 0;
}

p {
  margin-bottom: 1.25rem;
  color: var(--text-muted);
}

/* ==================== 通用页面头部 (Hero) ==================== */
.news-hero, .page-hero {
    background: linear-gradient(rgba(0, 51, 102, 0.9), rgba(0, 51, 102, 0.8)), url('https://news.sicau.edu.cn/__local/5/2B/B9/8F17795D30E0C713D911758509B_40ECE630_DE2A3.png?e=.png');
    background-size: cover;
    background-position: center;
    padding: 6rem 0;
    color: white;
    text-align: center;
    margin-bottom: 4rem;
}

.news-hero h1, .page-hero h1 {
    font-size: 3.5rem;
    color: white;
    margin-bottom: 1rem;
}

.news-hero p, .page-hero p {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.1rem;
    max-width: 800px;
    margin: 0 auto;
}

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: var(--transition-base);
}

a:hover {
  color: var(--primary-light);
}

/* ==================== 容器和布局 ==================== */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 40px;
}

.row {
  display: flex;
  flex-wrap: wrap;
  margin: 0 -1rem;
}

.col {
  padding: 0 1rem;
}

.col-12 { width: 100%; }
.col-6 { width: 50%; }
.col-4 { width: 33.333%; }
.col-3 { width: 25%; }

/* ==================== 按钮与表单 ==================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.75rem;
  border-radius: 4px;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition-base);
  border: 1px solid transparent;
  font-size: 0.95rem;
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--primary-color);
  color: white;
}

.btn-primary:hover {
  background-color: var(--primary-light);
  color: white;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(45, 106, 79, 0.2);
}

.btn-outline {
  background-color: transparent;
  border-color: var(--primary-color);
  color: var(--primary-color);
}

.btn-outline:hover {
  background-color: var(--primary-color);
  color: white;
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

.form-control {
  width: 100%;
  padding: 0.875rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  background-color: var(--bg-light);
  color: var(--text-main);
  transition: var(--transition-base);
}

.form-control:focus {
  outline: none;
  border-color: var(--primary-color);
  background-color: var(--bg-white);
  box-shadow: 0 0 0 3px rgba(45, 106, 79, 0.1);
}

/* ==================== 导航栏 ==================== */
.navbar {
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  box-shadow: 0 2px 15px rgba(0, 0, 0, 0.03);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 0.75rem 0;
  transition: var(--transition-base);
}

.navbar-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.brand-logo {
    width: 48px;
    height: 48px;
    object-fit: contain;
}

.brand-text-logo {
    height: 40px;
    width: auto;
    object-fit: contain;
}

.brand-text {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--primary-color);
    line-height: 1.2;
    font-family: "SimSun", "宋体", "STKaiti", "KaiTi", serif;
    letter-spacing: 2px;
}

.brand-text small {
    display: block;
    font-size: 0.6rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--text-muted);
}

.navbar-menu {
  display: flex;
  list-style: none;
  gap: 2rem;
  align-items: center;
}

/* 汉堡菜单按钮 */
.navbar-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-around;
  width: 30px;
  height: 24px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
  z-index: 1100;
}

.navbar-toggle span {
  width: 100%;
  height: 3px;
  background-color: var(--primary-color);
  border-radius: 2px;
  transition: all 0.3s ease;
}

.navbar-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.navbar-toggle.active span:nth-child(2) {
  opacity: 0;
}

.navbar-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -6px);
}

.navbar-item a {
  color: var(--text-main);
  font-weight: 500;
  font-size: 0.95rem;
  position: relative;
}

.navbar-item a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--primary-color);
  transition: var(--transition-base);
}

.navbar-item a:hover::after,
.navbar-item a.active::after {
  width: 100%;
}

.navbar-item a.btn::after {
  display: none;
}

/* ==================== 页脚 ==================== */
.footer {
  background-color: #1a1a1a;
  color: #e5e5e5;
  padding: var(--space-xl) 0 var(--space-md);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
}

.footer-links {
  text-align: right;
}

.footer-brand h1 {
  color: var(--primary-color);
  margin-bottom: var(--space-md);
  font-size: 1.5rem;
}

.footer-links h3 {
  color: var(--primary-color);
  font-size: 1.1rem;
  margin-bottom: 1.5rem;
}

.footer-links ul {
  list-style: none;
}

.footer-links li {
  margin-bottom: 0.75rem;
}

.footer-links a {
  color: #94a3b8;
}

.footer-links a:hover {
  color: var(--accent-color);
  padding-left: 0.25rem;
}

.footer-bottom {
  border-top: 1px solid #333;
  padding-top: var(--space-md);
  text-align: center;
  font-size: 0.9rem;
  color: #666;
}

/* ==================== 其他通用组件 ==================== */
.breadcrumb {
  padding: 1.5rem 0 0.5rem;
  background-color: transparent;
  margin-bottom: 2rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.breadcrumb a {
  color: var(--text-muted);
}

.breadcrumb a:hover {
  color: var(--primary-color);
}

.pagination {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin-top: var(--space-lg);
}

.pagination .page-item {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-color);
  color: var(--text-main);
  transition: var(--transition-base);
}

.pagination .page-item.active {
  background-color: var(--primary-color);
  border-color: var(--primary-color);
  color: white;
}

.pagination .page-item:hover:not(.active) {
  background-color: var(--bg-section);
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 992px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
  }

  .footer-links {
    text-align: left;
  }
}

@media (max-width: 768px) {
  body {
    padding-top: 60px;
  }
  
  .navbar-toggle {
    display: flex;
  }
  
  .navbar-menu {
    display: none;
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    background: white;
    flex-direction: column;
    padding: 1rem;
    gap: 0;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    z-index: 1000;
  }
  
  .navbar-menu.active {
    display: flex;
  }
  
  .navbar-item {
    width: 100%;
    border-bottom: 1px solid var(--border-color);
  }
  
  .navbar-item:last-child {
    border-bottom: none;
  }
  
  .navbar-item a {
    display: block;
    padding: 1rem;
    text-align: center;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
  }

  h1 { font-size: 1.875rem; }
  h2 { font-size: 1.5rem; }
  h3 { font-size: 1.25rem; }

  .container {
    padding: 0 1rem;
  }

  .col-6 { width: 100%; }
  .col-4 { width: 50%; }
  .col-3 { width: 100%; }
}

.btn-primary {
  background-color: var(--primary-color);
  color: #fff;
}

.btn-primary:hover {
  background-color: #1d4ed8;
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background-color: var(--secondary-color);
  color: var(--white);
}

.btn-outline {
  background-color: transparent;
  border: 1px solid var(--primary-color);
  color: var(--primary-color);
}

.btn-outline:hover {
  background-color: var(--primary-color);
  color: var(--white);
}

.btn-lg {
  padding: 1rem 2rem;
  font-size: 1.125rem;
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

/* ==================== 表格 ==================== */
table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 2rem;
}

th {
  background-color: var(--light-bg);
  padding: 1rem;
  text-align: left;
  font-weight: 600;
  border-bottom: 2px solid var(--border-color);
}

td {
  padding: 1rem;
  border-bottom: 1px solid var(--border-color);
}

tr:hover {
  background-color: var(--light-bg);
}

/* ==================== 表单 ==================== */
.form-group {
  margin-bottom: 1.5rem;
}

.form-label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--text-dark);
}

.form-control {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: 0.375rem;
  font-size: 1rem;
  transition: border-color 0.3s ease;
}

.form-control:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

textarea.form-control {
  resize: vertical;
  min-height: 120px;
}

select.form-control {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3E%3Cpath stroke='%23334155' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3E%3C/svg%3E");
  background-position: right 0.75rem center;
  background-repeat: no-repeat;
  background-size: 1.5em 1.5em;
  padding-right: 2.5rem;
}

/* ==================== 卡片 ==================== */
.card {
  background-color: var(--white);
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
}

.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.card-header {
  padding: 1.5rem;
  border-bottom: 1px solid var(--border-color);
  background-color: var(--light-bg);
}

.card-body {
  padding: 1.5rem;
}

.card-footer {
  padding: 1rem 1.5rem;
  background-color: var(--light-bg);
  border-top: 1px solid var(--border-color);
}

/* ==================== 导航 (DEPRECATED: 移至上方统一配置) ==================== */

/* ==================== 英雄区域 ==================== */
.hero:not(.ripple-effect) {
  background: linear-gradient(135deg, var(--primary-color), #1e40af);
  color: var(--white);
  padding: 6rem 0;
  text-align: center;
}

.hero:not(.ripple-effect) h1 {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.hero:not(.ripple-effect) p {
  font-size: 1.25rem;
  margin-bottom: 2rem;
  opacity: 0.9;
  color: var(--white);
}

/* ==================== 网格系统 ==================== */
.grid {
  display: grid;
  gap: 2rem;
}

.grid-2 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }

@media (max-width: 768px) {
  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
  }
}

/* ==================== 分页 ==================== */
.pagination {
  display: flex;
  list-style: none;
  gap: 0.5rem;
  justify-content: center;
  margin-top: 2rem;
}

.pagination a,
.pagination span {
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: 0.375rem;
  color: var(--text-dark);
  cursor: pointer;
  transition: all 0.3s ease;
}

.pagination a:hover {
  background-color: var(--primary-color);
  color: var(--white);
  border-color: var(--primary-color);
}

.pagination .active span {
  background-color: var(--primary-color);
  color: var(--white);
  border-color: var(--primary-color);
}

/* ==================== 提示信息 ==================== */
.alert {
  padding: 1rem 1.5rem;
  border-radius: 0.375rem;
  margin-bottom: 1rem;
}

.alert-success {
  background-color: #d1fae5;
  color: #065f46;
  border-left: 4px solid var(--success-color);
}

.alert-danger {
  background-color: #fee2e2;
  color: #7f1d1d;
  border-left: 4px solid var(--danger-color);
}

.alert-warning {
  background-color: #fef3c7;
  color: #92400e;
  border-left: 4px solid var(--warning-color);
}

.alert-info {
  background-color: #dbeafe;
  color: #0c2340;
  border-left: 4px solid var(--primary-color);
}

/* ==================== 页脚 ==================== */
.footer {
  background-color: var(--text-dark);
  color: var(--white);
  padding: 3rem 0 1rem;
  margin-top: 4rem;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-section h4 {
  color: var(--white);
}

.footer-section a {
  color: rgba(255, 255, 255, 0.7);
}

.footer-section a:hover {
  color: var(--white);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 2rem;
  text-align: center;
  color: rgba(255, 255, 255, 0.6);
}

/* ==================== 加载状态 ==================== */
.loading {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid var(--border-color);
  border-top-color: var(--primary-color);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* 统一的“加载中”占位样式：旋转圆环 + 呼吸文字 */
.loading-text {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
  padding: 2.5rem 1rem;
  color: var(--text-muted);
  font-size: 0.95rem;
  letter-spacing: 0.05em;
  animation: loading-blink 1.4s ease-in-out infinite;
}

.loading-text::before {
  content: "";
  width: 1.15rem;
  height: 1.15rem;
  flex-shrink: 0;
  border: 2px solid var(--border-color);
  border-top-color: var(--primary-color);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.loading-text.compact {
  padding: 0.75rem 0;
}

@keyframes loading-blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.55; }
}

/* 空状态 / 错误状态：与加载占位同样的排版，但不显示转圈 */
.loading-text.no-spin,
.empty-state,
.error-message {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2.5rem 1rem;
  color: var(--text-muted);
  font-size: 0.95rem;
  letter-spacing: 0.05em;
}

.loading-text.no-spin::before,
.empty-state::before,
.error-message::before {
  content: none;
}

.error-message {
  color: var(--danger-color);
}

/* ==================== 实用类 ==================== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

.p-1 { padding: 0.5rem; }
.p-2 { padding: 1rem; }
.p-3 { padding: 1.5rem; }
.p-4 { padding: 2rem; }

.text-muted { color: var(--text-light); }
.text-primary { color: var(--primary-color); }
.text-success { color: var(--success-color); }

.d-none { display: none; }
.d-block { display: block; }
.d-flex { display: flex; }
.d-grid { display: grid; }

.justify-content-center { justify-content: center; }
.justify-content-between { justify-content: space-between; }

.align-items-center { align-items: center; }

.gap-1 { gap: 0.5rem; }
.gap-2 { gap: 1rem; }
.gap-3 { gap: 1.5rem; }