/* ==========================================================================
   全局样式：基础排版 / 容器 / 按钮 / 导航 / 页脚 / 通用组件
   ========================================================================== */

body {
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  color: var(--color-text);
  background: var(--color-bg);
}

/* ---------- 容器 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 2.4rem;
}

.container-wide {
  max-width: var(--container-wide);
}

/* ---------- 区块通用 ---------- */
.section {
  padding-block: var(--section-pad);
}

.section--soft {
  background: var(--color-bg-soft);
}

.section--dark {
  background: var(--grad-dark);
  color: var(--color-dark-copy);
}

.section__head {
  max-width: 72rem;
  margin: 0 auto var(--space-5);
  text-align: center;
}

.section__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  font-size: var(--fs-sm);
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--color-accent);
  text-transform: uppercase;
  margin-bottom: var(--space-2);
}

.section__eyebrow::before {
  content: "";
  width: 2.4rem;
  height: 2px;
  background: var(--grad-accent);
  border-radius: 2px;
}

.section__title {
  font-size: var(--fs-h2);
  color: var(--color-ink);
  letter-spacing: 0;
}

.section--dark .section__title {
  color: var(--color-text-inverse);
}

.section__desc {
  margin-top: var(--space-2);
  font-size: var(--fs-lg);
  color: var(--color-text-muted);
}

.section--dark .section__desc {
  color: var(--color-dark-copy-subtle);
}

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

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.8rem;
  padding: 1.3rem 2.6rem;
  font-size: var(--fs-base);
  font-weight: 600;
  border-radius: var(--radius-pill);
  transition: transform var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease), background var(--dur) var(--ease),
    color var(--dur) var(--ease);
  white-space: nowrap;
}

.btn svg {
  width: 1.8rem;
  height: 1.8rem;
}

.btn--primary {
  background: var(--grad-accent);
  color: var(--color-cta-text);
  box-shadow: var(--shadow-accent);
}

@media (hover: hover) {
  .btn--primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 1.8rem 4rem rgba(0, 200, 150, 0.4);
  }
}

.btn--ghost {
  background: var(--glass-bg-strong);
  color: var(--color-text-inverse);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

@media (hover: hover) {
  .btn--ghost:hover {
    background: rgba(255, 255, 255, 0.22);
    transform: translateY(-3px);
  }
}

.btn--outline {
  background: transparent;
  color: var(--color-primary);
  border: 1.5px solid var(--color-line);
}

@media (hover: hover) {
  .btn--outline:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
    transform: translateY(-3px);
  }
}

.btn--lg {
  padding: 1.6rem 3.4rem;
  font-size: var(--fs-lg);
}

.btn--block {
  width: 100%;
}

/* 文本链接箭头 */
.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 600;
  color: var(--color-cta);
  transition: gap var(--dur) var(--ease), color var(--dur) var(--ease);
}

.link-arrow svg {
  width: 1.6rem;
  height: 1.6rem;
  transition: transform var(--dur) var(--ease);
}

@media (hover: hover) {
  .link-arrow:hover {
    color: var(--color-accent);
  }

  .link-arrow:hover svg {
    transform: translateX(4px);
  }
}

.link-arrow:active {
  color: var(--color-accent);
}

/* ==========================================================================
   顶部导航（玻璃悬浮）
   ========================================================================== */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  transition: background var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease), backdrop-filter var(--dur) var(--ease);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2.4rem;
  width: 100%;
}

/* 默认透明叠在 hero 上，滚动后玻璃化 */
.site-header--scrolled {
  background: var(--glass-nav);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  box-shadow: 0 0.4rem 2rem rgba(6, 24, 41, 0.25);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

/* Logo */
.brand {
  display: flex;
  align-items: center;
  gap: 1.1rem;
  color: var(--color-text-inverse);
}

.brand__mark {
  width: 3.8rem;
  height: 3.8rem;
  min-width: 3.8rem;
  max-width: 3.8rem;
  aspect-ratio: 1 / 1;
  flex-shrink: 0;
  border-radius: 1rem;
  display: grid;
  place-items: center;
  background: transparent;
  box-shadow: none;
  overflow: hidden;
}

.brand__mark img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: none;
  object-fit: cover;
}

.brand__text {
  line-height: 1.15;
}

.brand__name {
  font-size: 1.9rem;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.brand__sub {
  font-size: 1.1rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--color-accent-soft);
  text-transform: uppercase;
}

/* 主导航 */
.nav {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.nav__list {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 0.8rem 1.4rem;
  font-size: var(--fs-base);
  font-weight: 500;
  letter-spacing: 0.02em;
  color: rgba(255, 255, 255, 0.85);
  border-radius: var(--radius-pill);
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.nav__link[aria-current="page"],
.current-menu-item > .nav__link {
  color: var(--color-text-inverse);
  background: rgba(255, 255, 255, 0.1);
}

@media (hover: hover) {
  .nav__link:hover {
    color: var(--color-text-inverse);
    background: rgba(255, 255, 255, 0.1);
  }
}

/* 右侧操作区 */
.header-actions {
  display: flex;
  align-items: center;
  gap: 1.6rem;
}

.header-tel {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--color-text-inverse);
  font-weight: 600;
}

.header-tel svg {
  width: 1.8rem;
  height: 1.8rem;
  color: var(--color-accent);
}

.header-tel__num {
  font-size: 1.7rem;
  letter-spacing: 0.02em;
}

/* 汉堡按钮 */
.nav-toggle {
  display: none;
  width: 4.4rem;
  height: 4.4rem;
  border-radius: var(--radius-sm);
  background: var(--glass-bg-strong);
  border: 1px solid var(--glass-border);
}

.nav-toggle span {
  display: block;
  width: 2rem;
  height: 2px;
  margin: 0.4rem auto;
  background: var(--color-text-inverse);
  border-radius: 2px;
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

/* ==========================================================================
   页脚
   ========================================================================== */
.site-footer {
  background: var(--color-primary-deep);
  color: var(--color-dark-copy-soft);
  padding-top: var(--space-7);
}

.footer-top {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1.4fr;
  gap: 4rem;
  padding-bottom: var(--space-6);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-brand .brand {
  margin-bottom: var(--space-3);
}

.footer-brand__desc {
  font-size: var(--fs-sm);
  line-height: 1.8;
  color: var(--color-dark-copy-weaker);
  max-width: 34rem;
}

.footer-col__title {
  font-size: var(--fs-base);
  font-weight: 700;
  color: var(--color-text-inverse);
  margin-bottom: var(--space-3);
}

.footer-links li {
  margin-bottom: 1.2rem;
}

.footer-links a {
  font-size: var(--fs-sm);
  color: var(--color-dark-copy-muted);
  transition: color var(--dur) var(--ease);
}

@media (hover: hover) {
  .footer-links a:hover {
    color: var(--color-accent);
  }
}

.footer-links a:active {
  color: var(--color-accent);
}

.footer-contact li {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.4rem;
  font-size: var(--fs-sm);
  color: var(--color-dark-copy-muted);
}

.footer-contact svg {
  width: 1.8rem;
  height: 1.8rem;
  flex-shrink: 0;
  color: var(--color-accent);
  margin-top: 0.2rem;
}

.footer-contact__cta {
  margin-top: 1.2rem;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.6rem;
  padding-block: var(--space-3);
  font-size: var(--fs-xs);
  color: var(--color-dark-copy-faint);
}

.footer-bottom__links {
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
}

@media (hover: hover) {
  .footer-bottom__links a:hover {
    color: var(--color-accent);
  }
}

.footer-bottom__links a:active {
  color: var(--color-accent);
}

/* ==========================================================================
   移动端底部固定操作条
   ========================================================================== */
.mobile-bar {
  display: none;
  position: fixed;
  inset: auto 0 0 0;
  z-index: 90;
  background: rgba(8, 18, 32, 0.96);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 0.8rem;
}

.mobile-bar__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.8rem;
}

.mobile-bar a {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 1.2rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: var(--fs-sm);
}

.mobile-bar a svg {
  width: 1.8rem;
  height: 1.8rem;
}

.mobile-bar__tel {
  background: var(--glass-bg-strong);
  color: var(--color-text-inverse);
  border: 1px solid var(--glass-border);
}

.mobile-bar__cta {
  background: var(--grad-accent);
  color: var(--color-cta-text);
}

/* ---------- 回到顶部 ---------- */
.to-top {
  position: fixed;
  right: 2.4rem;
  bottom: 3.2rem;
  z-index: 80;
  width: 4.8rem;
  height: 4.8rem;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--color-primary);
  color: var(--color-text-inverse);
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(1.2rem);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease),
    background var(--dur) var(--ease);
}

.to-top svg {
  width: 2rem;
  height: 2rem;
}

.to-top--show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

@media (hover: hover) {
  .to-top:hover {
    background: var(--color-cta);
  }
}

.to-top--pressed,
.to-top:active {
  background: var(--color-cta);
}

/* ==========================================================================
   滚动渐入动画基类
   ========================================================================== */
.reveal {
  opacity: 0;
  transform: translateY(2.4rem);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

.reveal[data-delay="1"] {
  transition-delay: 0.08s;
}
.reveal[data-delay="2"] {
  transition-delay: 0.16s;
}
.reveal[data-delay="3"] {
  transition-delay: 0.24s;
}
.reveal[data-delay="4"] {
  transition-delay: 0.32s;
}
.reveal[data-delay="5"] {
  transition-delay: 0.4s;
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
  html {
    scroll-behavior: auto;
  }
}

/* ==========================================================================
   响应式：导航折叠
   ========================================================================== */
@media (max-width: 1120px) {
  .nav,
  .header-tel {
    display: none;
  }

  .nav-toggle {
    display: block;
  }

  /* 移动端展开菜单 */
  .nav.is-open {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    position: fixed;
    inset: var(--header-h) 0 auto 0;
    padding: 1.6rem 2.4rem 2.4rem;
    gap: 0.4rem;
    background: var(--glass-nav-solid);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: var(--shadow-lg);
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
  }

  .nav.is-open .nav__list {
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 0.4rem;
  }

  .nav.is-open .nav__link {
    display: flex;
    width: 100%;
    padding: 1.3rem 1.4rem;
    font-size: var(--fs-lg);
    border-radius: var(--radius-sm);
  }

  .nav.is-open .nav__link[aria-current="page"],
  .nav.is-open .current-menu-item > .nav__link {
    background: rgba(255, 255, 255, 0.1);
  }

  @media (hover: hover) {
    .nav.is-open .nav__link:hover {
      background: rgba(255, 255, 255, 0.1);
    }
  }

  .nav-toggle.is-active span:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
  }
  .nav-toggle.is-active span:nth-child(2) {
    opacity: 0;
  }
  .nav-toggle.is-active span:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
  }

  .header-actions .btn {
    display: none;
  }
}

@media (max-width: 960px) {
  .footer-top {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 3.2rem;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 768px) {
  .container {
    padding-inline: 2rem;
  }

  .footer-top {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer-top > .footer-col:last-child {
    grid-column: 1 / -1;
  }

  .mobile-bar {
    display: block;
  }

  .site-footer {
    padding-bottom: 8rem; /* 给底部操作条留位 */
  }

  .to-top {
    bottom: 9rem;
    right: 1.6rem;
  }
}

@media (max-width: 560px) {
  .footer-top {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 2.8rem;
  }
}

@media (max-width: 360px) {
  .footer-top {
    grid-template-columns: 1fr;
  }
}