/* glm对比网页/css/global.css */

/* ===== Base Layout & Typography ===== */
body {
  font-family: var(--font-family);
  background-color: var(--color-bg);
  color: var(--color-text);
  font-size: var(--fs-body);
  line-height: 1.7;
  overflow-x: hidden;
}

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

section {
  padding: var(--section-spacing) 0;
}

/* Section title component */
.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-header__tag {
  display: inline-block;
  color: var(--color-cta);
  font-size: var(--fs-small);
  font-weight: var(--font-weight-semibold);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section-header__title {
  font-size: var(--fs-section-title);
  font-weight: var(--font-weight-bold);
  line-height: 1.3;
  margin-bottom: 16px;
}

.section-header__desc {
  font-size: var(--fs-body);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* Breadcrumb */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: var(--fs-small);
  margin-bottom: 16px;
}

.breadcrumb a {
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

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

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

.breadcrumb__current {
  color: var(--color-text);
}

/* Sub-page hero banner */
.page-hero {
  min-height: 40vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: linear-gradient(135deg, var(--color-bg), var(--color-bg-card));
  position: relative;
  overflow: hidden;
  padding-top: 80px;
}

.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 40px 40px;
}

.page-hero::after {
  content: '';
  position: absolute;
  top: -80px;
  right: -80px;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: var(--color-primary);
  filter: blur(100px);
  opacity: 0.12;
  z-index: 0;
  animation: float-orb 20s ease-in-out infinite;
}

/* hero-banner alias — same styles as page-hero */
.hero-banner {
  min-height: 40vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: linear-gradient(135deg, var(--color-bg), var(--color-bg-card));
  position: relative;
  overflow: hidden;
  padding-top: 80px;
}

.hero-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 40px 40px;
}

.hero-banner::after {
  content: '';
  position: absolute;
  top: -80px;
  right: -80px;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: var(--color-primary);
  filter: blur(100px);
  opacity: 0.12;
  z-index: 0;
  animation: float-orb 20s ease-in-out infinite;
}

.hero-banner .container {
  position: relative;
  z-index: 1;
}

.hero-banner__title {
  font-size: var(--fs-section-title);
  font-weight: var(--font-weight-bold);
  line-height: 1.3;
}

.page-hero__content {
  position: relative;
  z-index: 1;
}

.page-hero__title {
  font-size: var(--fs-section-title);
  font-weight: var(--font-weight-bold);
  line-height: 1.3;
}

/* Responsive — Layout */
@media (max-width: 767px) {
  :root {
    --fs-hero: 32px;
    --fs-section-title: 28px;
    --fs-card-title: 18px;
    --fs-body: 15px;
    --section-spacing: 48px;
    --content-padding: 16px;
    --card-padding: 16px;
    --card-gap: 16px;
  }
}

@media (min-width: 768px) and (max-width: 1023px) {
  :root {
    --content-padding: 24px;
  }
}

/* ===== Navbar ===== */
.navbar {
  position: fixed;
  top: 16px;
  left: 16px;
  right: 16px;
  z-index: var(--z-navbar);
  background: var(--glass-bg);
  backdrop-filter: blur(var(--blur-amount));
  -webkit-backdrop-filter: blur(var(--blur-amount));
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  transition: background var(--transition-fast);
}

.navbar.is-scrolled {
  background: rgba(15, 23, 42, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.navbar__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
  white-space: nowrap;
}

.navbar__logo svg {
  width: 32px;
  height: 32px;
}

.navbar__links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.navbar__link {
  font-size: var(--fs-small);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
  position: relative;
  padding: 4px 0;
}

.navbar__link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width var(--transition-fast);
}

.navbar__link:hover,
.navbar__link.is-active {
  color: var(--color-text);
}

.navbar__link.is-active::after {
  width: 100%;
}

.navbar__cta {
  flex-shrink: 0;
}

/* Hamburger button (mobile) */
.navbar__hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 24px;
  height: 24px;
  cursor: pointer;
  z-index: calc(var(--z-drawer) + 1);
}

.navbar__hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition-normal),
              opacity var(--transition-normal);
}

.navbar__hamburger.is-open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.navbar__hamburger.is-open span:nth-child(2) {
  opacity: 0;
}

.navbar__hamburger.is-open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile drawer overlay */
.nav-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: var(--z-overlay);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.nav-overlay.is-visible {
  opacity: 1;
}

/* Mobile drawer */
.nav-drawer {
  position: fixed;
  top: 0;
  right: 0;
  width: 280px;
  height: 100%;
  background: var(--color-bg-card);
  z-index: var(--z-drawer);
  padding: 80px 32px 32px;
  transform: translateX(100%);
  transition: transform var(--transition-normal);
}

.nav-drawer.is-open {
  transform: translateX(0);
}

.nav-drawer__links {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.nav-drawer__link {
  font-size: var(--fs-body);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.nav-drawer__link:hover,
.nav-drawer__link.is-active {
  color: var(--color-text);
}

.nav-drawer__cta {
  margin-top: 32px;
  width: 100%;
}

/* Navbar mobile breakpoint */
@media (max-width: 767px) {
  .navbar__links,
  .navbar__cta {
    display: none;
  }

  .navbar__hamburger {
    display: flex;
  }

  .nav-overlay,
  .nav-drawer {
    display: block;
  }
}

/* ===== Footer ===== */
.footer {
  background-color: var(--color-footer-bg);
  padding: 64px 0 32px;
  margin-top: 0;
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer__company-name {
  font-size: 20px;
  font-weight: var(--font-weight-bold);
  margin-bottom: 12px;
}

.footer__company-desc {
  font-size: var(--fs-small);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.footer__heading {
  font-size: var(--fs-small);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 20px;
}

.footer__links {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer__link {
  font-size: var(--fs-small);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.footer__link:hover {
  color: var(--color-text);
}

.footer__contact-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 14px;
  font-size: var(--fs-small);
  color: var(--color-text-secondary);
}

.footer__contact-item svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  margin-top: 2px;
  color: var(--color-primary);
}

.footer__bottom {
  border-top: 1px solid var(--glass-border);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer__copyright {
  font-size: 13px;
  color: var(--color-text-muted);
}

.footer__socials {
  display: flex;
  gap: 16px;
}

.footer__social-link {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast),
              border-color var(--transition-fast);
}

.footer__social-link:hover {
  color: var(--color-text);
  border-color: var(--glass-border-hover);
}

.footer__social-link svg {
  width: 18px;
  height: 18px;
}

@media (max-width: 767px) {
  .footer__grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer__bottom {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }
}

@media (min-width: 768px) and (max-width: 1023px) {
  .footer__grid {
    grid-template-columns: 1fr 1fr;
  }
}

/* ===== Back to Top Button ===== */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  z-index: 40;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-primary);
  color: var(--color-text);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal), background var(--transition-fast);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.back-to-top:hover {
  background: var(--color-secondary);
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
}

@media (max-width: 767px) {
  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .back-to-top {
    transition: none;
  }
}

/* ===== Focus styles ===== */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}