/* 武汉蓝硕电力科技 - 布局样式 */

/* Reset & Base ----------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  color: var(--color-text);
  background: linear-gradient(180deg, rgba(241, 245, 249, 0.75) 0%, rgba(248, 250, 252, 0.95) 26%, #ffffff 100%);
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-base), opacity var(--transition-base);
}

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

img {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: inherit;
}

main {
  display: block;
}

/* Header ----------------------------------------------------------------- */
.header {
  position: fixed;
  inset: 0 0 auto 0;
  height: var(--header-height);
  background: rgba(8, 58, 107, 0.85);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 12px 32px rgba(8, 58, 107, 0.18);
  z-index: var(--z-fixed);
  transition: background var(--transition-slow), box-shadow var(--transition-slow);
}

.header::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(10, 77, 140, 0.92), rgba(5, 150, 105, 0.82));
  z-index: -1;
}

.header.scrolled {
  background: rgba(8, 58, 107, 0.96);
  box-shadow: 0 18px 40px rgba(8, 58, 107, 0.25);
}

.header.scrolled::before {
  opacity: 0.95;
}

.header-container {
  max-width: var(--container-wide-width);
  margin: 0 auto;
  height: 100%;
  padding: 0 var(--spacing-xl);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-xl);
}

.navbar-logo,
.logo {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: #ffffff;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.logo > span,
.navbar-logo > span {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
  gap: 2px;
}

.navbar-logo span,
.logo span {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  opacity: 0.88;
}

.logo small {
  font-size: 12px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.75);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.logo-icon {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.14);
  border: 1px solid rgba(255, 255, 255, 0.25);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-bold);
  color: #ffffff;
  letter-spacing: 0.1em;
}

.nav,
.navbar-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-menu,
.navbar-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  list-style: none;
  padding: 0;
  margin: 0;
}

.nav-item,
.navbar-menu > li {
  position: relative;
}

.nav-link,
.navbar-menu > li > a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 12px 18px;
  font-size: 15px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.9);
  border-radius: var(--radius-md);
  transition: background var(--transition-base), color var(--transition-base), transform var(--transition-fast);
}

.nav-link:hover,
.navbar-menu > li > a:hover,
.nav-link:focus-visible,
.navbar-menu > li > a:focus-visible {
  background: rgba(255, 255, 255, 0.18);
  color: #ffffff;
}

.nav-link.active,
.navbar-menu > li > a.active {
  background: rgba(255, 255, 255, 0.24);
  color: #ffffff;
  font-weight: var(--font-weight-semibold);
}

.nav-arrow {
  width: 7px;
  height: 7px;
  border: solid rgba(255, 255, 255, 0.65);
  border-width: 0 1px 1px 0;
  transform: rotate(45deg);
  margin-top: 2px;
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.22);
  color: #ffffff;
  cursor: pointer;
  transition: background var(--transition-base), transform var(--transition-base);
}

.nav-toggle:hover,
.nav-toggle:focus-visible {
  background: rgba(255, 255, 255, 0.22);
}

.nav-toggle .bar {
  display: block;
  width: 22px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  position: relative;
}

.nav-toggle .bar::before,
.nav-toggle .bar::after {
  content: "";
  position: absolute;
  left: 0;
  width: 22px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.nav-toggle .bar::before {
  top: -6px;
}

.nav-toggle .bar::after {
  top: 6px;
}

.nav-toggle[aria-expanded="true"] .bar {
  background: transparent;
}

.nav-toggle[aria-expanded="true"] .bar::before {
  transform: translateY(6px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .bar::after {
  transform: translateY(-6px) rotate(-45deg);
}

/* Dropdown --------------------------------------------------------------- */
.dropdown-menu {
  position: absolute;
  inset: calc(100% + 12px) auto auto 0;
  min-width: 200px;
  background: #ffffff;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  border: 1px solid rgba(15, 23, 42, 0.08);
  padding: var(--spacing-sm) 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: opacity var(--transition-base), transform var(--transition-base), visibility var(--transition-base);
  z-index: var(--z-dropdown);
}

.nav-item:hover > .dropdown-menu,
.navbar-menu > li:hover > .dropdown-menu,
.nav-item:focus-within > .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-item,
.dropdown-menu a {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: 10px 18px;
  color: var(--color-text);
  font-size: 14px;
  transition: background var(--transition-fast), color var(--transition-fast), padding-left var(--transition-fast);
}

.dropdown-item::before,
.dropdown-menu a::before {
  content: "›";
  font-size: 12px;
  color: var(--color-primary-light);
  opacity: 0;
  transform: translateX(-6px);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.dropdown-item:hover,
.dropdown-menu a:hover {
  background: var(--color-bg-secondary);
  color: var(--color-primary);
  padding-left: 22px;
}

.dropdown-item:hover::before,
.dropdown-menu a:hover::before {
  opacity: 1;
  transform: translateX(0);
}

/* Main ------------------------------------------------------------------- */
.main-content {
  margin-top: calc(var(--header-height) + var(--spacing-lg));
  min-height: calc(100vh - var(--header-height));
}

.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.container-wide {
  width: 100%;
  max-width: var(--container-wide-width);
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
}

.section {
  padding: var(--section-padding-y) 0;
}

.section-compact {
  padding: calc(var(--section-padding-y) * 0.65) 0;
}

/* Footer ----------------------------------------------------------------- */
.footer {
  background: linear-gradient(145deg, #0f1f2f 0%, #102a43 45%, #0a4d8c 100%);
  color: rgba(255, 255, 255, 0.86);
  padding: var(--spacing-4xl) 0 var(--spacing-xl);
  position: relative;
  overflow: hidden;
}

.footer::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at top left, rgba(59, 130, 246, 0.25), transparent 55%);
  opacity: 0.6;
  pointer-events: none;
}

.footer::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at bottom right, rgba(20, 184, 166, 0.25), transparent 50%);
  opacity: 0.5;
  pointer-events: none;
}

.footer-content {
  position: relative;
  display: grid;
  grid-template-columns: 2.2fr repeat(3, 1fr);
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
}

.footer-section {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.footer-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: #ffffff;
  margin-bottom: var(--spacing-sm);
}

.footer-text {
  font-size: var(--font-size-sm);
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.72);
}

.footer-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-link {
  color: rgba(255, 255, 255, 0.68);
  font-size: var(--font-size-sm);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.footer-link::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  transition: background var(--transition-base);
}

.footer-link:hover::before {
  background: var(--color-accent);
}

.footer-contact {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.78);
}

.footer-contact li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.footer-contact strong {
  color: #ffffff;
  min-width: 72px;
  font-weight: var(--font-weight-semibold);
}

.footer-bottom {
  position: relative;
  padding-top: var(--spacing-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  text-align: center;
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.65);
}

.footer-bottom a {
  color: rgba(255, 255, 255, 0.78);
}

/* Responsive ------------------------------------------------------------- */
@media (max-width: 1200px) {
  .header-container {
    padding: 0 var(--spacing-lg);
  }

  .footer-content {
    grid-template-columns: repeat(2, minmax(220px, 1fr));
  }
}

@media (max-width: 992px) {
  .header-container {
    gap: var(--spacing-md);
  }

  .nav,
  .navbar-menu {
    gap: 4px;
  }
}

@media (max-width: 840px) {
  .header {
    height: auto;
  }

  .header-container {
    flex-wrap: wrap;
    padding: var(--spacing-sm) var(--spacing-lg);
    gap: var(--spacing-md);
  }

  .nav-toggle {
    display: inline-flex;
    order: 3;
    margin-left: auto;
  }

  .nav,
  .navbar-menu {
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    background: rgba(15, 31, 47, 0.92);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-md);
    display: none;
  }

  .nav[aria-expanded="true"],
  .navbar-menu[aria-expanded="true"] {
    display: flex;
  }

  .nav-item,
  .navbar-menu > li {
    width: 100%;
  }

  .nav-link,
  .navbar-menu > li > a {
    width: 100%;
    justify-content: space-between;
  }

  .dropdown-menu {
    position: static;
    inset: auto;
    transform: none;
    opacity: 1;
    visibility: visible;
    box-shadow: none;
    border: none;
    background: rgba(15, 31, 47, 0.65);
    margin-top: var(--spacing-sm);
  }

  .dropdown-item,
  .dropdown-menu a {
    color: rgba(255, 255, 255, 0.9);
  }

  .dropdown-item:hover,
  .dropdown-menu a:hover {
    background: rgba(255, 255, 255, 0.1);
    color: #ffffff;
  }

  .footer-content {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .container,
  .container-wide {
    padding: 0 var(--spacing-md);
  }

  .footer {
    padding: var(--spacing-3xl) 0 var(--spacing-lg);
  }

  .footer-content {
    gap: var(--spacing-xl);
  }
}