/* =========================================================================
   layout.css — 页面骨架与响应式布局
   断点：0 / 480 / 768 / 1024 / 1280
   ========================================================================= */

/* ---------- 顶部导航 ---------- */
.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: var(--z-header);
  border-bottom: 1px solid transparent;
  transition: background-color var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

.site-header.is-scrolled {
  background: var(--bg-header);
  border-bottom-color: var(--bd-subtle);
  -webkit-backdrop-filter: blur(14px) saturate(150%);
  backdrop-filter: blur(14px) saturate(150%);
}

.header__inner {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  /* 固定值：不能用 --header-h，否则 JS 实测回写会和 ResizeObserver 形成自增循环 */
  min-height: 68px;
  transition: min-height var(--dur) var(--ease);
}

.site-header.is-scrolled .header__inner {
  min-height: 58px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 8px 6px 0;
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.brand__mark {
  width: 26px;
  height: 26px;
  color: var(--accent);
}

.brand__name {
  font-family: var(--font-serif);
  font-size: 1.0625rem;
}

.nav {
  display: none;
}

.nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 12px;
  border-radius: var(--r-full);
  color: var(--fg-muted);
  font-size: 0.9063rem;
  transition: color var(--dur) var(--ease);
}

.nav__link::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 6px;
  height: 1.5px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform var(--dur) var(--ease);
}

.nav__link:hover {
  color: var(--fg-primary);
}

.nav__link[aria-current="location"] {
  color: var(--fg-primary);
}

.nav__link[aria-current="location"]::after {
  transform: scaleX(1);
}

.header__tools {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}

.tool {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: var(--r-md);
  color: var(--fg-muted);
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.tool:hover {
  color: var(--fg-primary);
  background: var(--bg-subtle);
}

.tool svg {
  width: 18px;
  height: 18px;
}

.lang {
  position: relative;
}

.lang__label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

/* ---------- 语言下拉 ---------- */
.menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  z-index: 120;
  width: 216px;
  padding: 6px;
  border: 1px solid var(--bd-subtle);
  border-radius: 14px;
  background: var(--bg-raised);
  box-shadow: var(--shadow-3);
  visibility: hidden;
  opacity: 0;
  transform: translateY(-6px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease),
    visibility 0s linear var(--dur);
}

.menu.is-open {
  visibility: visible;
  opacity: 1;
  transform: none;
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease),
    visibility 0s;
}

.menu__item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  width: 100%;
  padding: 9px 10px;
  border-radius: 8px;
  color: var(--fg-secondary);
  font-size: 0.875rem;
  text-align: left;
}

.menu__item:hover {
  background: var(--bg-subtle);
  color: var(--fg-primary);
}

.menu__item[aria-checked="true"] {
  color: var(--fg-primary);
  font-weight: 600;
}

.menu__check {
  width: 14px;
  height: 14px;
  color: var(--accent);
  opacity: 0;
}

.menu__item[aria-checked="true"] .menu__check {
  opacity: 1;
}

.menu__native {
  display: block;
  color: var(--fg-muted);
  font-size: 0.6875rem;
  font-weight: 400;
  letter-spacing: 0.02em;
}

/* 窄屏下语言下拉改为贴视口右侧固定定位，避免从左侧溢出 */
@media (max-width: 1023.98px) {
  .menu {
    position: fixed;
    top: calc(var(--header-h) - 2px);
    right: var(--gutter);
    left: auto;
    width: min(280px, calc(100vw - var(--gutter) * 2));
  }
}

/* ---------- 移动端导航 ---------- */
.nav-toggle {
  display: grid;
}

.nav-toggle__bars,
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  display: block;
  width: 18px;
  height: 1.5px;
  border-radius: 2px;
  background: currentColor;
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.nav-toggle__bars {
  position: relative;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
}

.nav-toggle__bars::before {
  top: -6px;
}

.nav-toggle__bars::after {
  top: 6px;
}

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

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

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

.nav-panel {
  position: fixed;
  inset: 0;
  z-index: var(--z-overlay);
  display: flex;
  flex-direction: column;
  height: 100vh;
  padding: calc(var(--space-3) + env(safe-area-inset-top)) var(--gutter)
    calc(var(--space-6) + env(safe-area-inset-bottom));
  background: var(--bg-page);
  visibility: hidden;
  opacity: 0;
  transform: translateY(-10px);
  overflow-y: auto;
  overscroll-behavior: contain;
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease),
    visibility 0s linear var(--dur);
}

@supports (height: 100dvh) {
  .nav-panel {
    height: 100dvh;
  }
}

.nav-panel.is-open {
  visibility: visible;
  opacity: 1;
  transform: none;
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease),
    visibility 0s;
}

.nav-panel__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 56px;
}

.nav-panel__links {
  display: flex;
  flex-direction: column;
  margin-top: var(--space-5);
  border-top: 1px solid var(--bd-subtle);
}

.nav-panel__links a {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 14px 0;
  border-bottom: 1px solid var(--bd-subtle);
  font-family: var(--font-serif);
  font-size: 1.5rem;
  letter-spacing: -0.02em;
}

.nav-panel__links a span:last-child {
  color: var(--fg-muted);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.nav-panel__tools {
  margin-top: auto;
  padding-top: var(--space-7);
  display: grid;
  gap: var(--space-5);
}

.nav-panel__group > p {
  margin-bottom: 10px;
  color: var(--fg-muted);
  font-size: 0.75rem;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
}

.segmented {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.segmented button {
  flex: 1 1 auto;
  min-height: 40px;
  padding: 0 14px;
  border: 1px solid var(--bd-subtle);
  border-radius: var(--r-full);
  color: var(--fg-muted);
  font-size: 0.8125rem;
  white-space: nowrap;
}

.segmented button[aria-checked="true"],
.segmented button[aria-pressed="true"] {
  border-color: var(--accent);
  background: var(--accent-weak);
  color: var(--accent);
  font-weight: 600;
}

/* ---------- Hero ---------- */
.hero {
  padding-top: calc(72px + clamp(40px, 9vh, 84px));
  padding-bottom: var(--section-pad);
}

@media (max-width: 767.98px) {
  .hero {
    padding-top: 104px;
  }
}

/* 吸顶导航下，锚点跳转要留出头部高度；--header-h 由 nav.js 实测写入 */
.hero,
.section,
.closing {
  scroll-margin-top: calc(var(--header-h) + 16px);
}

.hero__grid {
  display: grid;
  gap: var(--space-7);
  align-items: center;
}

.hero__text {
  min-width: 0;
}

.hero__media {
  order: -1;
  max-width: 360px;
  width: 100%;
}

.hero h1 {
  font-size: var(--fs-h1);
  line-height: var(--lh-tight);
  margin-bottom: var(--space-3);
}

.hero__role {
  margin-bottom: var(--space-5);
  color: var(--fg-secondary);
  font-size: clamp(1rem, 0.95rem + 0.25vw, 1.1875rem);
  letter-spacing: 0.01em;
}

.hero__summary {
  max-width: 44ch;
  color: var(--fg-muted);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-6);
}

.stats {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-6);
  margin-top: var(--space-7);
  padding-top: var(--space-5);
  border-top: 1px solid var(--bd-subtle);
}

.stats > div {
  display: flex;
  flex-direction: column-reverse;
  gap: 2px;
  min-width: 96px;
}

.stats dt {
  color: var(--fg-muted);
  font-size: 0.8125rem;
}

.stats dd {
  font-family: var(--font-serif);
  font-size: 1.875rem;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.avatar {
  overflow: hidden;
  border: 1px solid var(--bd-subtle);
  border-radius: var(--r-xl);
  background: var(--bg-subtle);
  box-shadow: var(--shadow-3);
}

.avatar img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
}

.hero__status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: var(--space-4);
  color: var(--fg-secondary);
  font-size: 0.8125rem;
}

.pulse {
  position: relative;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
}

.pulse::after {
  content: "";
  position: absolute;
  inset: -4px;
  border: 1px solid var(--accent);
  border-radius: 50%;
  opacity: 0;
  animation: pulse 2.6s var(--ease) infinite;
}

@keyframes pulse {
  0% {
    transform: scale(0.6);
    opacity: 0.7;
  }
  70%,
  100% {
    transform: scale(1.5);
    opacity: 0;
  }
}

/* ---------- 近况条 ---------- */
.now {
  background: var(--bg-subtle);
  border-block: 1px solid var(--bd-subtle);
}

.now__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3) var(--space-5);
  padding-block: 14px;
}

.now__label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--fg-muted);
  font-size: 0.75rem;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
}

.now__list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px var(--space-5);
}

.now__list li {
  display: flex;
  gap: 8px;
  align-items: baseline;
  font-size: 0.8125rem;
  min-width: 0;
}

.now__k {
  color: var(--fg-muted);
  white-space: nowrap;
}

.now__v {
  color: var(--fg-secondary);
}

.now__toggle {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
  padding: 6px 0;
  color: var(--fg-muted);
  font-size: 0.75rem;
}

.now__toggle:hover {
  color: var(--fg-primary);
}

.now__toggle svg {
  width: 14px;
  height: 14px;
  transition: transform var(--dur) var(--ease);
}

.now.is-collapsed .now__list {
  display: none;
}

.now.is-collapsed .now__toggle svg {
  transform: rotate(180deg);
}

/* ---------- 技能 ---------- */
.marquee {
  position: relative;
  overflow: hidden;
  margin-bottom: var(--space-8);
  padding-block: 10px;
  border-block: 1px solid var(--bd-subtle);
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 6%, #000 94%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 6%, #000 94%, transparent);
}

.marquee__track {
  display: flex;
  width: max-content;
  gap: var(--space-6);
  animation: marquee 46s linear infinite;
}

.marquee:hover .marquee__track,
.marquee:focus-within .marquee__track {
  animation-play-state: paused;
}

.marquee__group {
  display: flex;
  gap: var(--space-6);
  color: var(--fg-muted);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  white-space: nowrap;
}

.marquee__group span::after {
  content: "/";
  margin-left: var(--space-6);
  color: var(--bd-strong);
}

@keyframes marquee {
  from {
    transform: translateX(0);
  }
  to {
    transform: translateX(-50%);
  }
}

@media (prefers-reduced-motion: reduce) {
  .marquee__track {
    animation: none;
    flex-wrap: wrap;
    width: 100%;
  }

  .marquee__group:nth-child(2) {
    display: none;
  }

  .marquee__group {
    flex-wrap: wrap;
    white-space: normal;
  }
}

.skills__grid {
  display: grid;
  gap: var(--space-6);
}

.skill-group {
  min-width: 0;
}

.skill-group__title {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--bd-subtle);
  color: var(--fg-secondary);
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.skill-group__count {
  color: var(--fg-muted);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 400;
}

/* ---------- 作品 ---------- */
.work__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-5);
}

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: var(--space-6);
}

.cards {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-5);
}

.work__note {
  margin-top: var(--space-5);
  color: var(--fg-muted);
  font-size: 0.8125rem;
}

/* ---------- 笔记 ---------- */
.notes {
  border-top: 1px solid var(--bd-subtle);
}

.note {
  border-bottom: 1px solid var(--bd-subtle);
}

/* ---------- 时间线 ---------- */
.timeline {
  position: relative;
  display: grid;
  gap: var(--space-7);
}

.timeline::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 7px;
  width: 1px;
  background: var(--bd-subtle);
}

.tl {
  position: relative;
  padding-left: 32px;
  min-width: 0;
}

.tl::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 9px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--bg-page);
}

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

.tl__period {
  color: var(--fg-muted);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.02em;
}

.tl__org {
  margin-top: 2px;
  color: var(--fg-muted);
  font-size: 0.8125rem;
}

.tl__role {
  font-size: var(--fs-h3);
  margin-bottom: var(--space-3);
}

.tl__list {
  display: grid;
  gap: 6px;
  color: var(--fg-secondary);
  font-size: 0.9375rem;
  line-height: 1.7;
}

.tl__list li {
  position: relative;
  padding-left: 16px;
}

.tl__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 5px;
  height: 1px;
  background: var(--bd-strong);
}

.tl__result {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: var(--space-4);
  padding: 10px 12px;
  border-left: 2px solid var(--accent);
  background: var(--accent-weak);
  color: var(--fg-secondary);
  font-size: 0.875rem;
}

.tl__result-label {
  color: var(--accent);
  font-weight: 600;
  white-space: nowrap;
}

.badge-now {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  margin-left: 6px;
  padding: 1px 7px;
  border: 1px solid var(--accent);
  border-radius: var(--r-full);
  color: var(--accent);
  font-family: var(--font-sans);
  font-size: 0.6875rem;
  vertical-align: 1px;
}

/* ---------- 联系 ---------- */
.contact__grid {
  display: grid;
  gap: var(--space-7);
}

.contact__intro {
  min-width: 0;
}

.contact__mail {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
  margin-top: var(--space-5);
}

.mailto {
  font-family: var(--font-serif);
  font-size: clamp(1.25rem, 1.1rem + 0.7vw, 1.625rem);
  letter-spacing: -0.01em;
  border-bottom: 1px solid var(--bd-strong);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.mailto:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.contact__label {
  margin-top: var(--space-6);
  margin-bottom: var(--space-3);
  color: var(--fg-muted);
  font-size: 0.75rem;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
}

.social {
  display: flex;
  gap: 8px;
}

.social a {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border: 1px solid var(--bd-subtle);
  border-radius: var(--r-full);
  color: var(--fg-muted);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease),
    background-color var(--dur) var(--ease);
}

.social a:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-weak);
}

.social svg {
  width: 18px;
  height: 18px;
}

/* ---------- FAQ ---------- */
.faq {
  margin-top: var(--space-8);
  padding-top: var(--space-6);
  border-top: 1px solid var(--bd-subtle);
}

.faq__title {
  margin-bottom: var(--space-5);
  font-size: var(--fs-h3);
}

.faq__list {
  max-width: 78ch;
}

/* ---------- 结尾宣言 ---------- */
.closing {
  padding-block: var(--section-pad);
  border-top: 1px solid var(--bd-subtle);
}

.closing__title {
  max-width: 20ch;
  margin-block: var(--space-4) var(--space-5);
  font-size: var(--fs-display);
  line-height: 1.18;
}

.closing__lead {
  max-width: 64ch;
  color: var(--fg-muted);
}

.closing__actions {
  margin-top: var(--space-6);
}

.closing__deco {
  margin-top: var(--space-8);
  color: var(--bd-subtle);
}

.closing__deco svg {
  width: 100%;
  height: 44px;
}

/* ---------- 页脚 ---------- */
.site-footer {
  border-top: 1px solid var(--bd-subtle);
  padding-block: var(--space-6);
  font-size: 0.8125rem;
  color: var(--fg-muted);
}

.footer__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3) var(--space-5);
}

.footer__meta {
  display: grid;
  gap: 4px;
}

.footer__note {
  color: var(--fg-muted);
  opacity: 0.85;
}

.to-top {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 40px;
  padding: 0 12px;
  border: 1px solid var(--bd-subtle);
  border-radius: var(--r-full);
  color: var(--fg-muted);
  font-size: 0.8125rem;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.to-top:hover {
  color: var(--fg-primary);
  border-color: var(--bd-strong);
}

.to-top svg {
  width: 14px;
  height: 14px;
}

/* ---------- 回到顶部浮钮 ---------- */
.fab {
  position: fixed;
  right: clamp(16px, 3vw, 28px);
  bottom: clamp(16px, 3vw, 28px);
  z-index: 90;
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border: 1px solid var(--bd-subtle);
  border-radius: var(--r-full);
  background: var(--bg-surface);
  color: var(--fg-secondary);
  box-shadow: var(--shadow-2);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease),
    visibility var(--dur), color var(--dur) var(--ease);
}

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

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

.fab svg {
  width: 16px;
  height: 16px;
}

/* =========================================================================
   断点
   ========================================================================= */

@media (min-width: 480px) {
  .now__toggle {
    margin-left: 0;
  }

  .hero__media {
    max-width: 400px;
  }
}

@media (min-width: 768px) {
  .skills__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--space-5);
  }

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

  .now__toggle {
    margin-left: auto;
  }

  .footer__inner {
    flex-wrap: nowrap;
  }
}

@media (min-width: 1024px) {
  .nav {
    display: block;
    margin-left: var(--space-5);
  }

  .nav-toggle {
    display: none;
  }

  .nav-panel {
    display: none;
  }

  .hero__grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    gap: clamp(40px, 6vw, 88px);
  }

  .hero__media {
    order: 0;
    max-width: none;
    justify-self: end;
    width: 100%;
  }

  .cards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .contact__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    gap: clamp(40px, 6vw, 80px);
    align-items: start;
  }

  .timeline::before {
    left: 50%;
  }

  .tl {
    display: grid;
    grid-template-columns: 1fr 1fr;
    padding-left: 0;
  }

  .tl::before {
    left: 50%;
    top: 10px;
    transform: translateX(-50%);
  }

  .tl__side {
    grid-column: 1;
    grid-row: 1;
    margin-bottom: 0;
    padding-right: var(--space-7);
    text-align: right;
  }

  .tl__body {
    grid-column: 2;
    grid-row: 1;
    padding-left: var(--space-7);
  }

  .tl:nth-child(even) .tl__side {
    grid-column: 2;
    padding-right: 0;
    padding-left: var(--space-7);
    text-align: left;
  }

  .tl:nth-child(even) .tl__body {
    grid-column: 1;
    padding-left: 0;
    padding-right: var(--space-7);
  }
}

@media (min-width: 1280px) {
  .hero {
    padding-top: 168px;
  }
}

/* ---------- 触控设备不触发 hover 位移 ---------- */
@media (hover: none) {
  .card:hover {
    transform: none;
    box-shadow: none;
  }
}