/* ============================================================
 * BioQuest — 布局与导航样式
 * ============================================================ */

/* ----- 顶部导航栏 ----- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(26, 58, 42, 0.94);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 32px;
  z-index: 100;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.header-brand {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-white);
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  transition: opacity var(--transition-fast);
}

.header-brand:hover {
  opacity: 0.85;
  color: var(--color-white);
}

.header-brand svg {
  flex-shrink: 0;
}

.header-nav {
  display: flex;
  gap: 4px;
}

.header-nav a {
  color: rgba(255, 255, 255, 0.68);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast),
              color var(--transition-fast);
}

.header-nav a:hover {
  color: var(--color-white);
  background: rgba(255, 255, 255, 0.08);
}

.header-nav a.active,
.header-nav a[aria-current="page"] {
  color: var(--color-white);
  background: rgba(255, 255, 255, 0.12);
}

.header-nav a:focus-visible {
  box-shadow: 0 0 0 2px rgba(196, 149, 106, 0.6);
  outline: none;
}

/* 主题切换按钮 */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(255, 255, 255, 0.2);
  background: transparent;
  color: rgba(255, 255, 255, 0.7);
  cursor: pointer;
  font-size: 1.1rem;
  transition: background-color var(--transition-fast),
              color var(--transition-fast),
              border-color var(--transition-fast);
  margin-left: 12px;
  flex-shrink: 0;
}

.theme-toggle:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--color-white);
  border-color: rgba(255, 255, 255, 0.4);
}

.theme-toggle:focus-visible {
  box-shadow: 0 0 0 2px rgba(196, 149, 106, 0.6);
  outline: none;
}

.theme-toggle svg {
  width: 18px;
  height: 18px;
  display: none;
}

html[data-theme="light"] .theme-toggle .icon-moon,
.theme-toggle .icon-moon { display: block; }
html[data-theme="light"] .theme-toggle .icon-sun { display: none; }
html[data-theme="dark"] .theme-toggle .icon-moon { display: none; }
html[data-theme="dark"] .theme-toggle .icon-sun { display: block; }

.header-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* ----- 汉堡菜单按钮 ----- */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  border: none;
  background: transparent;
  cursor: pointer;
  padding: 0;
  z-index: 110;
  transition: transform var(--transition-base);
}

.hamburger:hover {
  transform: scale(1.08);
}

.hamburger:active {
  transform: scale(0.95);
}

.hamburger-line {
  display: block;
  width: 22px;
  height: 2px;
  background-color: rgba(255, 255, 255, 0.8);
  border-radius: 2px;
  transition: transform var(--transition-base),
              opacity var(--transition-base),
              width var(--transition-base),
              background-color var(--transition-base);
  transform-origin: center;
}

/* 汉堡 → X 动画 */
.hamburger.active .hamburger-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
  width: 24px;
}

.hamburger.active .hamburger-line:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.hamburger.active .hamburger-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
  width: 24px;
}

/* 汉堡线呼吸动画（未激活时） */
@keyframes hamburgerBreathe {
  0%, 100% { opacity: 0.8; }
  50% { opacity: 1; }
}

.hamburger:not(.active):hover .hamburger-line {
  animation: hamburgerBreathe 1.2s ease-in-out infinite;
}

.hamburger:not(.active):hover .hamburger-line:nth-child(2) {
  animation-delay: 0.15s;
}

.hamburger:not(.active):hover .hamburger-line:nth-child(3) {
  animation-delay: 0.3s;
}

/* ----- 移动端导航覆盖层 ----- */
/* 样式由 debug-fix.css 统一管理（支持过渡动画） */
.mobile-nav-overlay {
  position: fixed;
  inset: 0;
  z-index: 95;
}

/* 移动端导航菜单 */
/* 基础定位由 debug-fix.css 管理，此处仅定义非动画相关样式 */
.mobile-nav {
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  background-color: var(--color-surface);
  background-image: none;
  z-index: 99;
  padding: 16px 20px 24px;
  flex-direction: column;
  gap: 4px;
  border-bottom: 1px solid var(--color-border-light, rgba(0, 0, 0, 0.08));
  box-shadow: var(--shadow-md, 0 4px 12px rgba(0, 0, 0, 0.1));
}

.mobile-nav a {
  display: block;
  color: var(--color-text, #2d2d2d);
  font-size: 1rem;
  font-weight: 500;
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: background-color var(--transition-fast),
              color var(--transition-fast),
              transform var(--transition-fast),
              opacity var(--transition-fast);
  opacity: 0;
  transform: translateX(-12px);
}

.mobile-nav.active a {
  opacity: 1;
  transform: translateX(0);
}

/* 导航链接交错入场 */
.mobile-nav.active a:nth-child(1) { transition-delay: 0.05s; }
.mobile-nav.active a:nth-child(2) { transition-delay: 0.08s; }
.mobile-nav.active a:nth-child(3) { transition-delay: 0.11s; }
.mobile-nav.active a:nth-child(4) { transition-delay: 0.14s; }
.mobile-nav.active a:nth-child(5) { transition-delay: 0.17s; }
.mobile-nav.active a:nth-child(6) { transition-delay: 0.20s; }
.mobile-nav.active a:nth-child(7) { transition-delay: 0.23s; }
.mobile-nav.active a:nth-child(8) { transition-delay: 0.26s; }
.mobile-nav.active .theme-toggle-row { transition-delay: 0.29s; }

.mobile-nav a:hover,
.mobile-nav a.active {
  color: var(--color-primary, #3a6b4a);
  background: rgba(90, 125, 92, 0.12);
}

.mobile-nav .theme-toggle-row {
  margin-top: 12px;
  padding: 14px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--color-text, #2d2d2d);
  font-size: 0.875rem;
  border-top: 1px solid var(--color-border-light, rgba(255, 255, 255, 0.1));
}

/* ----- 页面内容区域 ----- */
.page-content {
  padding-top: calc(var(--header-height) + 32px);
  padding-bottom: 48px;
  min-height: calc(100vh - var(--header-height) - 200px);
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding-left: var(--content-padding);
  padding-right: var(--content-padding);
}

.page-content--full {
  padding-top: var(--header-height);
  max-width: none;
  padding-left: 0;
  padding-right: 0;
}

.page-content--home {
  padding-top: 0;
  padding-left: 0;
  padding-right: 0;
  max-width: none;
}

/* ============================================================
 * layout.css 底部页脚之后添加布局辅助样式
 * ============================================================ */

/* ----- Stats Strip 布局辅助 ----- */
.stats-strip .container {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 0 var(--content-padding);
}

/* ----- Process Steps 布局辅助 ----- */
.process-steps {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
}

.process-connector {
  display: flex;
  align-items: flex-start;
  padding-top: 60px;
  color: var(--border-default);
}

@media (max-width: 1024px) {
  .process-connector {
    display: none;
  }
}

/* ----- Footer ----- */
.footer {
  background: var(--color-deep);
  padding: 44px 0;
  color: rgba(255, 255, 255, 0.6);
}

.footer-content {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 0 var(--content-padding);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-brand {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 700;
  color: rgba(255, 255, 255, 0.9);
}

.footer-links {
  display: flex;
  gap: 24px;
  align-items: center;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.45);
  text-decoration: none;
  font-size: 0.8rem;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--color-amber);
}

.footer-copyright {
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.25);
}

/* ============================================================
 * 响应式设计
 * ============================================================ */

/* 平板及以下 — 显示汉堡菜单 */
@media (max-width: 768px) {
  .header {
    padding: 0 20px;
  }

  .header-brand {
    font-size: 1.1rem;
  }

  .header-nav {
    display: none;
  }

  .theme-toggle {
    display: none;
  }

  .header-right {
    gap: 4px;
  }

  .hamburger {
    display: flex;
  }

  .mobile-nav-overlay {
    display: block;
  }

  .mobile-nav {
    display: flex;
  }

  .footer-content {
    padding: 0 20px;
    flex-direction: column;
    text-align: center;
  }

  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
  }
}

/* 手机 */
@media (max-width: 640px) {
  .page-content {
    padding-top: calc(var(--header-height) + 20px);
    padding-bottom: 32px;
  }
}