/* ========================================
   components.css — 导航、页脚、光标等通用组件
   ======================================== */

/* ---------- 自定义光标 ---------- */
.cursor-dot {
  position: fixed;
  top: 0;
  left: 0;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-ivory);
  pointer-events: none;
  z-index: 10000;
  mix-blend-mode: difference;
  transform: translate(-50%, -50%);
  transition: width 0.3s var(--ease-out), height 0.3s var(--ease-out),
    background 0.3s var(--ease-out);
}

.cursor-dot.is-hovering {
  width: 48px;
  height: 48px;
  background: var(--color-accent);
}

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

/* ---------- 顶部导航 ---------- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  padding: 1.75rem var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background var(--transition-base), padding var(--transition-base),
    backdrop-filter var(--transition-base);
}

.nav.is-scrolled {
  background: rgba(14, 14, 14, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  padding: 1.25rem var(--gutter);
  border-bottom: 1px solid var(--color-line);
}

.nav__logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  display: flex;
  align-items: baseline;
  gap: 0.25rem;
}

.nav__logo .logo-en {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-stone-light);
  font-weight: 400;
}

.nav__menu {
  display: flex;
  align-items: center;
  gap: 2.5rem;
}

.nav__link {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-stone-light);
  padding: 0.5rem 1.1rem;
  border-radius: 999px;
  transition: all var(--transition-fast);
  position: relative;
}

.nav__link:hover {
  color: var(--color-ivory);
  background: rgba(255, 255, 255, 0.06);
}

.nav__link.is-active {
  color: var(--color-ink);
  background: var(--color-accent);
  box-shadow: 0 0 24px var(--color-accent-glow);
}

.nav__link.is-active:hover {
  background: var(--color-accent);
  color: var(--color-ink);
}

.nav__link-num {
  color: var(--color-accent);
  margin-right: 0.35rem;
  font-size: 0.6em;
  vertical-align: super;
}

.nav__link.is-active .nav__link-num {
  color: var(--color-ink);
}

/* 汉堡菜单按钮 */
.nav__toggle {
  display: none;
  width: 32px;
  height: 32px;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 6px;
  z-index: 101;
}

.nav__toggle span {
  display: block;
  width: 24px;
  height: 1.5px;
  background: var(--color-ivory);
  transition: all var(--transition-fast);
}

.nav__toggle.is-open span:nth-child(1) {
  transform: translateY(7.5px) rotate(45deg);
}

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

.nav__toggle.is-open span:nth-child(3) {
  transform: translateY(-7.5px) rotate(-45deg);
}

/* 移动端菜单 */
@media (max-width: 768px) {
  .nav__menu {
    position: fixed;
    inset: 0;
    background: var(--color-ink);
    flex-direction: column;
    justify-content: center;
    gap: 2rem;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-base);
  }

  .nav__menu.is-open {
    opacity: 1;
    pointer-events: auto;
  }

  .nav__link {
    font-family: var(--font-display);
    font-size: 2rem;
    text-transform: none;
    letter-spacing: 0;
  }

  .nav__toggle {
    display: flex;
  }
}

/* ---------- 页脚 ---------- */
.footer {
  background: var(--color-ink-soft);
  padding: var(--space-xl) var(--gutter) var(--space-lg);
  border-top: 1px solid var(--color-line);
}

.footer__inner {
  max-width: var(--container);
  margin: 0 auto;
}

.footer__top {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--color-line);
}

.footer__brand {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3.5rem);
  line-height: 1.1;
  font-weight: 500;
}

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

.footer__brand-tag {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  letter-spacing: 0.12em;
  color: var(--color-stone);
  margin-top: var(--space-sm);
}

.footer__col h4 {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  letter-spacing: 0.15em;
  color: var(--color-stone-light);
  margin-bottom: var(--space-sm);
  font-weight: 400;
}

.footer__col ul li {
  margin-bottom: 0.5rem;
  font-size: var(--fs-small);
  color: var(--color-stone-light);
}

.footer__col a {
  font-size: var(--fs-small);
  color: var(--color-stone-light);
  transition: color var(--transition-fast);
}

.footer__col a:hover {
  color: var(--color-accent);
}

.footer__col .text-muted {
  color: var(--color-stone-light);
}

.footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  letter-spacing: 0.08em;
  color: var(--color-stone);
  gap: var(--space-md);
}

.footer__bottom a {
  color: var(--color-stone);
}

.footer__bottom a:hover {
  color: var(--color-accent);
}

@media (max-width: 768px) {
  .footer__top {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .footer__bottom {
    flex-direction: column;
    gap: var(--space-sm);
    text-align: center;
  }
}

/* ---------- 区段标题 ---------- */
.section-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.section-header__label {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.section-header__label::before {
  content: "";
  display: block;
  width: 32px;
  height: 1px;
  background: var(--color-accent);
}

.section-header__title {
  font-size: var(--fs-h2);
  max-width: 60%;
}

.section-header__index {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  color: var(--color-stone);
  letter-spacing: 0.1em;
}

@media (max-width: 768px) {
  .section-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .section-header__title {
    max-width: 100%;
  }
}

/* ---------- 加载状态 ---------- */
.loader {
  position: fixed;
  inset: 0;
  background: var(--color-ink);
  z-index: 10001;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: var(--space-sm);
  transition: opacity 0.8s var(--ease-out), visibility 0.8s var(--ease-out);
}

.loader.is-hidden {
  opacity: 0;
  visibility: hidden;
}

.loader__text {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-stone-light);
}

.loader__bar {
  width: 120px;
  height: 1px;
  background: var(--color-line);
  overflow: hidden;
  position: relative;
}

.loader__bar::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--color-accent);
  transform: translateX(-100%);
  animation: loaderProgress 1.5s var(--ease-in-out) infinite;
}

@keyframes loaderProgress {
  0% { transform: translateX(-100%); }
  50% { transform: translateX(0); }
  100% { transform: translateX(100%); }
}