/* ============================================================
   区块样式：导航 / Hero / 关于 / 技能 / 项目 / 经历 / 联系 / 页脚
   ============================================================ */

/* ---------------- 顶部导航 ---------------- */

.nav {
  position: fixed;
  top: 0;
  right: 0;
  left: 0;
  z-index: 50;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  border-bottom: 1px solid transparent;
  transition:
    background-color var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

.nav.is-scrolled {
  background-color: rgba(10, 11, 15, 0.75);
  border-bottom-color: var(--border);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-2);
}

.nav__brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.nav__mark {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border: 1px solid var(--accent-line);
  border-radius: var(--r-sm);
  background-color: var(--accent-soft);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.02em;
}

.nav__list {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav__link {
  display: block;
  padding: 0.4rem 0.75rem;
  border-radius: var(--r-pill);
  color: var(--text-muted);
  font-size: var(--fs-sm);
  transition:
    color var(--dur) var(--ease),
    background-color var(--dur) var(--ease);
}

.nav__link:hover {
  color: var(--text);
  background-color: var(--surface-hover);
}

.nav__link[aria-current="true"] {
  color: var(--accent);
  background-color: var(--accent-soft);
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.lang-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.75rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--r-pill);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  transition:
    color var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    background-color var(--dur) var(--ease);
}

.lang-toggle:hover {
  color: var(--text);
  border-color: var(--accent-line);
  background-color: var(--surface-hover);
}

.nav__burger {
  display: none;
  place-items: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--border-strong);
  border-radius: var(--r-sm);
}

.nav__burger-bars,
.nav__burger-bars::before,
.nav__burger-bars::after {
  display: block;
  width: 16px;
  height: 2px;
  border-radius: 1px;
  background-color: var(--text);
  transition: transform var(--dur) var(--ease);
}

.nav__burger-bars::before,
.nav__burger-bars::after {
  content: "";
  position: relative;
}

.nav__burger-bars::before {
  top: 5px;
}

.nav__burger-bars::after {
  top: -7px;
}

.nav__burger[aria-expanded="true"] .nav__burger-bars {
  background-color: transparent;
}

.nav__burger[aria-expanded="true"] .nav__burger-bars::before {
  transform: translateY(-5px) rotate(45deg);
}

.nav__burger[aria-expanded="true"] .nav__burger-bars::after {
  transform: translateY(7px) rotate(-45deg);
}

/* ---------------- Hero ---------------- */

.hero {
  display: flex;
  align-items: center;
  min-height: 88vh;
  min-height: 88svh;
  padding-top: calc(var(--nav-h) + clamp(2.5rem, 7vw, 5rem));
  padding-bottom: clamp(3rem, 7vw, 5rem);
}

.hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  align-items: center;
  gap: clamp(2rem, 5vw, 4.5rem);
}

.hero__status {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: var(--sp-3);
  padding: 0.3rem 0.8rem 0.3rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  background-color: var(--surface);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  line-height: 1.5;
}

.dot {
  width: 7px;
  height: 7px;
  flex-shrink: 0;
  border-radius: 50%;
  background-color: var(--success);
  animation: pulse 2.4s var(--ease) infinite;
}

@keyframes pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(61, 220, 151, 0.55);
  }
  70% {
    box-shadow: 0 0 0 9px rgba(61, 220, 151, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(61, 220, 151, 0);
  }
}

.hero__name {
  display: block;
  font-size: var(--fs-display);
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1.04;
  color: var(--text);
  background-image: linear-gradient(175deg, #ffffff 30%, #a9b6cc 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* 浏览器不支持 background-clip: text 时，上面声明的 color 仍然可见 */
.hero__role {
  display: block;
  margin-top: 0.5rem;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: clamp(1.05rem, 2.2vw, 1.4rem);
  font-weight: 500;
}

.hero__lead {
  max-width: 54ch;
  margin-top: var(--sp-3);
  color: var(--text-muted);
  font-size: var(--fs-lead);
}

.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: var(--sp-4);
}

.social {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: var(--sp-4);
}

.social--center {
  justify-content: center;
}

.social__link {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background-color: var(--surface);
  color: var(--text-muted);
  transition:
    color var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    background-color var(--dur) var(--ease);
}

.social__link:hover {
  color: var(--accent);
  border-color: var(--accent-line);
  background-color: var(--accent-soft);
}

/* ---- 终端卡片 ---- */

.terminal {
  border: 1px solid var(--border-strong);
  border-radius: var(--r-lg);
  background-image: linear-gradient(180deg, rgba(23, 26, 36, 0.96), rgba(11, 13, 18, 0.96));
  box-shadow:
    var(--shadow),
    0 0 60px -40px var(--accent-glow);
  overflow: hidden;
}

.terminal__bar {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.7rem 0.9rem;
  border-bottom: 1px solid var(--border);
  background-color: var(--surface);
}

.terminal__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: #2b3140;
}

.terminal__title {
  margin-left: auto;
  color: var(--text-faint);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.terminal__body {
  padding: 1.1rem 1.2rem 1.4rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.9;
}

.terminal__prompt {
  margin-right: 0.5rem;
  color: var(--accent);
}

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

.terminal__out {
  padding-left: 1.1rem;
  color: var(--text-muted);
}

.terminal__cursor {
  display: inline-block;
  width: 8px;
  height: 1em;
  vertical-align: -0.15em;
  background-color: var(--accent);
  animation: blink 1.1s steps(1) infinite;
}

@keyframes blink {
  50% {
    opacity: 0;
  }
}

/* ---------------- 关于 ---------------- */

.about__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 4rem);
  align-items: start;
}

.facts {
  padding: 0.25rem 1.1rem;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background-color: var(--surface);
}

.facts__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--sp-2);
  padding: 0.8rem 0;
  border-bottom: 1px solid var(--border);
  font-size: var(--fs-sm);
}

.facts__row:last-child {
  border-bottom: 0;
}

.facts dt {
  color: var(--text-faint);
  white-space: nowrap;
}

.facts dd {
  margin: 0;
  color: var(--text);
  text-align: right;
}

/* ---------------- 技能 ---------------- */

.skills__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: clamp(1.5rem, 3vw, 2.5rem);
}

.skills__group-title {
  margin-bottom: var(--sp-2);
  font-size: var(--fs-h3);
  font-weight: 600;
}

/* ---------------- 项目 ---------------- */

.projects__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr));
  gap: var(--sp-3);
}

.card {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  background-color: var(--surface);
  overflow: hidden;
  transition:
    transform var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease);
}

.card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-line);
  box-shadow: 0 26px 50px -32px var(--accent-glow);
}

.card__thumb {
  position: relative;
  display: grid;
  place-items: center;
  aspect-ratio: 16 / 9;
  color: rgba(255, 255, 255, 0.72);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.card__thumb::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.06) 1px, transparent 1px);
  background-size: 26px 26px;
}

.card__thumb span {
  position: relative;
  z-index: 1;
}

.card__thumb--1 {
  background-image: linear-gradient(135deg, #16304f, #0a1120);
}

.card__thumb--2 {
  background-image: linear-gradient(135deg, #123a37, #08131a);
}

.card__thumb--3 {
  background-image: linear-gradient(135deg, #2c2450, #0d0a1c);
}

.card__thumb--4 {
  background-image: linear-gradient(135deg, #4a2b1c, #160d09);
}

.card__thumb--5 {
  background-image: linear-gradient(135deg, #1b2b4d, #0a0e18);
}

.card__thumb--6 {
  background-image: linear-gradient(135deg, #3a1f38, #130a14);
}

.card__body {
  display: flex;
  flex-direction: column;
  flex: 1;
  gap: var(--sp-2);
  padding: var(--sp-3);
}

.card__title {
  font-size: var(--fs-h3);
  font-weight: 600;
}

.card__desc {
  color: var(--text-muted);
  font-size: var(--fs-sm);
}

.card__links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-3);
  margin-top: auto;
  padding-top: var(--sp-1);
}

.card__link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--accent);
  font-size: var(--fs-sm);
}

.card__link:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------------- 经历时间线 ---------------- */

.timeline {
  position: relative;
  display: grid;
  gap: clamp(1.75rem, 4vw, 2.5rem);
  /* 限制单行长度：桌面端不设限时英文一行会超过 120 个字符 */
  max-width: 72ch;
}

.timeline::before {
  content: "";
  position: absolute;
  top: 10px;
  bottom: 10px;
  left: 7px;
  width: 1px;
  background-image: linear-gradient(
    180deg,
    rgba(79, 140, 255, 0.55),
    rgba(255, 255, 255, 0.06)
  );
}

.timeline__item {
  position: relative;
  padding-left: 2.25rem;
}

.timeline__item::before {
  content: "";
  position: absolute;
  top: 0.45rem;
  left: 0;
  width: 15px;
  height: 15px;
  border: 2px solid var(--accent);
  border-radius: 50%;
  background-color: var(--bg);
  box-shadow: 0 0 0 4px rgba(79, 140, 255, 0.12);
}

.timeline__period {
  color: var(--text-faint);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.06em;
}

.timeline__role {
  margin-top: 0.15rem;
  font-size: var(--fs-h3);
  font-weight: 600;
}

.timeline__org {
  color: var(--text-muted);
  font-size: var(--fs-sm);
}

.timeline__points {
  display: grid;
  gap: 0.5rem;
  margin-top: var(--sp-2);
}

.timeline__points li {
  position: relative;
  padding-left: 1.15rem;
  color: var(--text-muted);
  font-size: var(--fs-sm);
}

.timeline__points li::before {
  content: "";
  position: absolute;
  top: 0.62em;
  left: 0;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background-color: var(--accent);
  opacity: 0.75;
}

/* ---------------- 联系 ---------------- */

.contact {
  display: grid;
  justify-items: center;
  gap: var(--sp-2);
  padding: clamp(2.5rem, 6vw, 4rem) var(--gutter);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  background-image:
    radial-gradient(120% 130% at 50% 0%, rgba(79, 140, 255, 0.1), transparent 62%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0.01));
  text-align: center;
}

.contact__title {
  font-size: var(--fs-h2);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.contact__lead {
  max-width: 56ch;
  color: var(--text-muted);
  font-size: var(--fs-lead);
}

.contact .btn {
  margin-top: var(--sp-2);
}

.contact .social {
  margin-top: var(--sp-2);
}

/* ---------------- 页脚 ---------------- */

.footer {
  margin-top: clamp(3rem, 6vw, 5rem);
  padding-block: var(--sp-4);
  border-top: 1px solid var(--border);
}

.footer__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem var(--sp-3);
  color: var(--text-faint);
  font-size: var(--fs-sm);
}

.footer__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.footer__top {
  color: var(--text-muted);
  transition: color var(--dur) var(--ease);
}

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

/* ---------------- 响应式 ---------------- */

@media (max-width: 900px) {
  .nav__menu {
    position: fixed;
    top: var(--nav-h);
    right: 0;
    left: 0;
    padding: var(--sp-2) var(--gutter) var(--sp-3);
    border-bottom: 1px solid var(--border);
    background-color: rgba(10, 11, 15, 0.97);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    opacity: 0;
    transform: translateY(-12px);
    pointer-events: none;
    transition:
      opacity var(--dur) var(--ease),
      transform var(--dur) var(--ease);
  }

  .nav__menu.is-open {
    opacity: 1;
    transform: none;
    pointer-events: auto;
  }

  .nav__list {
    flex-direction: column;
    align-items: stretch;
  }

  .nav__link {
    padding: 0.7rem 0.75rem;
    border-radius: var(--r-sm);
    font-size: var(--fs-body);
  }

  .nav__burger {
    display: grid;
  }

  .hero {
    min-height: auto;
  }

  .hero__grid,
  .about__grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero__aside {
    order: -1;
  }

  .hero__lead {
    max-width: none;
  }

  .facts dd {
    text-align: left;
  }

  .facts__row {
    flex-direction: column;
    gap: 0.15rem;
  }
}

@media (max-width: 560px) {
  :root {
    --nav-h: 58px;
  }

  .nav__brand-text {
    display: none;
  }

  .hero__cta .btn {
    flex: 1 1 auto;
  }

  .timeline__item {
    padding-left: 1.85rem;
  }
}