/* ========================================
   四川侨晟科技有限公司 官网
   布局样式 - Grid 响应式布局、容器、导航等
   ======================================== */

/* ========== 容器 ========== */
.container {
  width: 100%;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--spacing-4);
  padding-right: var(--spacing-4);
}

@media (min-width: 640px) {
  .container {
    max-width: var(--container-sm);
  }
}

@media (min-width: 768px) {
  .container {
    max-width: var(--container-md);
  }
}

@media (min-width: 1024px) {
  .container {
    max-width: var(--container-lg);
  }
}

@media (min-width: 1280px) {
  .container {
    max-width: var(--container-xl);
  }
}

@media (min-width: 1536px) {
  .container {
    max-width: var(--container-2xl);
  }
}

/* ========== Grid 布局系统 ========== */
.grid {
  display: grid;
  gap: var(--spacing-4);
}

/* 2 列布局 */
.grid-2 {
  grid-template-columns: repeat(2, 1fr);
}

/* 3 列布局 */
.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

/* 4 列布局 */
.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

/* 6 列布局 */
.grid-6 {
  grid-template-columns: repeat(6, 1fr);
}

/* 响应式 2 列 */
.grid-responsive-2 {
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .grid-responsive-2 {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* 响应式 3 列 */
.grid-responsive-3 {
  grid-template-columns: 1fr;
}

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

@media (min-width: 1024px) {
  .grid-responsive-3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* 响应式 4 列 */
.grid-responsive-4 {
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .grid-responsive-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .grid-responsive-4 {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* 响应式 6 列 */
.grid-responsive-6 {
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .grid-responsive-6 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .grid-responsive-6 {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1280px) {
  .grid-responsive-6 {
    grid-template-columns: repeat(6, 1fr);
  }
}

/* Grid 间距调整 */
.grid-gap-2 { gap: var(--spacing-2); }
.grid-gap-3 { gap: var(--spacing-3); }
.grid-gap-4 { gap: var(--spacing-4); }
.grid-gap-6 { gap: var(--spacing-6); }
.grid-gap-8 { gap: var(--spacing-8); }

/* ========== Flexbox 布局 ========== */
.flex {
  display: flex;
}

.flex-row {
  flex-direction: row;
}

.flex-col {
  flex-direction: column;
}

.flex-wrap {
  flex-wrap: wrap;
}

.flex-nowrap {
  flex-wrap: nowrap;
}

.flex-center {
  justify-content: center;
  align-items: center;
}

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

.flex-around {
  justify-content: space-around;
  align-items: center;
}

.flex-start {
  justify-content: flex-start;
  align-items: flex-start;
}

.flex-end {
  justify-content: flex-end;
  align-items: flex-end;
}

.flex-1 { flex: 1; }
.flex-2 { flex: 2; }
.flex-3 { flex: 3; }

/* ========== 固定导航栏 ========== */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(8, 10, 20, 0.65);
  border-bottom: 1px solid var(--color-surface-border);
  backdrop-filter: blur(14px);
  box-shadow: 0 12px 25px rgba(8, 10, 20, 0.55);
  z-index: var(--z-fixed);
  transition: all var(--transition-base);
}

header.scrolled {
  background: rgba(8, 10, 20, 0.85);
  box-shadow: 0 18px 40px rgba(8, 10, 20, 0.65);
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-4);
  height: 70px;
}

.navbar-brand {
  display: flex;
  align-items: center;
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-white);
  text-decoration: none;
  transition: color var(--transition-base);
  gap: var(--spacing-2);
  letter-spacing: var(--letter-spacing-wide);
  text-transform: uppercase;
}

.navbar-brand:hover {
  color: var(--color-secondary);
  text-shadow: 0 0 14px rgba(0, 188, 212, 0.45);
}

.navbar-brand img {
  height: 40px;
  margin-right: var(--spacing-3);
}

.navbar-menu {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: var(--spacing-6);
}

.navbar-item {
  position: relative;
}

.navbar-link {
  display: flex;
  align-items: center;
  color: var(--color-text-secondary);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  transition: all var(--transition-base);
  padding: var(--spacing-2) 0;
  position: relative;
}

.navbar-link::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -10px;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, rgba(124, 77, 255, 0.6), rgba(0, 188, 212, 0.6));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

.navbar-link:hover {
  color: var(--color-white);
}

.navbar-link:hover::after,
.navbar-link.active::after {
  transform: scaleX(1);
}

.navbar-link.active {
  color: var(--color-white);
}

/* ========== 二级下拉菜单 ========== */
.dropdown {
  position: relative;
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  background: var(--color-surface);
  border: 1px solid var(--color-surface-border);
  border-radius: var(--radius-lg);
  box-shadow: 0 18px 40px rgba(6, 10, 26, 0.55);
  min-width: 200px;
  list-style: none;
  margin: 0;
  padding: var(--spacing-2) 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--transition-base);
  z-index: var(--z-dropdown);
}

.dropdown:hover .dropdown-menu,
.dropdown.active .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-item {
  padding: var(--spacing-3) var(--spacing-4);
  color: var(--color-text-secondary);
  text-decoration: none;
  display: block;
  transition: all var(--transition-base);
  border-left: 3px solid transparent;
}

.dropdown-item:hover {
  background: rgba(124, 77, 255, 0.18);
  color: var(--color-white);
  border-left-color: var(--color-secondary);
  padding-left: calc(var(--spacing-4) + 2px);
}

/* ========== 移动菜单 ========== */
.navbar-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  width: 30px;
  height: 30px;
}

.navbar-toggle span {
  display: block;
  width: 100%;
  height: 3px;
  background-color: var(--color-white);
  margin: 5px 0;
  transition: all var(--transition-base);
  border-radius: var(--radius-sm);
}

.navbar-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(8px, 8px);
}

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

.navbar-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(8px, -8px);
}

@media (max-width: 768px) {
  .navbar-toggle {
    display: block;
  }

  .navbar-menu {
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(8, 10, 20, 0.95);
    border-top: 1px solid var(--color-surface-border);
    gap: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base);
  }

  .navbar-menu.active {
    max-height: 500px;
  }

  .navbar-item {
    width: 100%;
  }

  .navbar-link {
    padding: var(--spacing-4);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  }

  .dropdown-menu {
    position: static;
    opacity: 0;
    visibility: hidden;
    max-height: 0;
    overflow: hidden;
    transform: none;
    border: none;
    box-shadow: none;
    background: transparent;
    transition: all var(--transition-base);
  }

  .dropdown.active .dropdown-menu {
    opacity: 1;
    visibility: visible;
    max-height: 500px;
  }

  .dropdown-item {
    padding-left: var(--spacing-8);
  }
}

/* ========== 主内容区域 ========== */
main {
  margin-top: 90px;
  min-height: calc(100vh - 90px);
}

/* ========== 页脚 ========== */
footer {
  background: linear-gradient(135deg, rgba(12, 14, 30, 0.95), rgba(6, 9, 24, 0.95));
  color: var(--color-text-primary);
  padding: var(--spacing-16) var(--spacing-4);
  margin-top: var(--spacing-20);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

footer a {
  color: var(--color-secondary);
}

footer a:hover {
  color: var(--color-primary-light);
  text-shadow: 0 0 10px rgba(124, 77, 255, 0.35);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-8);
  margin-bottom: var(--spacing-8);
}

.footer-section h3 {
  color: var(--color-white);
  margin-bottom: var(--spacing-4);
  font-size: var(--font-size-lg);
}

.footer-section ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-section li {
  margin-bottom: var(--spacing-2);
  color: var(--color-text-secondary);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--spacing-6);
  text-align: center;
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
}

/* ========== 响应式调整 ========== */
@media (max-width: 768px) {
  .navbar {
    height: 60px;
    padding: var(--spacing-3);
  }

  main {
    margin-top: 60px;
  }

  .container {
    padding-left: var(--spacing-3);
    padding-right: var(--spacing-3);
  }

  .grid-gap-8 {
    gap: var(--spacing-4);
  }
}

@media (max-width: 640px) {
  .navbar-brand {
    font-size: var(--font-size-lg);
  }

  .navbar-brand img {
    height: 30px;
    margin-right: var(--spacing-2);
  }

  .navbar-menu {
    gap: 0;
  }

  .grid-responsive-4,
  .grid-responsive-3,
  .grid-responsive-2 {
    grid-template-columns: 1fr;
  }
}