/* ---------- 导航 ---------- */

.nav {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  height: var(--nav-height);
  background: rgba(251, 251, 253, 0.6);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  backdrop-filter: saturate(180%) blur(20px);
  transition: background-color 0.4s ease, box-shadow 0.4s ease;
}

.nav.is-scrolled {
  background: rgba(251, 251, 253, 0.85);
  box-shadow: 0 1px 0 var(--color-hairline);
}

.nav__inner {
  max-width: var(--container-text);
  height: 100%;
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 4vw, 2rem);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.nav__brand {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--color-text);
}

.nav__brand:hover {
  text-decoration: none;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 2.5vw, 2rem);
  list-style: none;
}

.nav__links a {
  font-size: 0.875rem;
  color: rgba(29, 29, 31, 0.8);
  transition: color 0.2s ease;
}

.nav__links a:hover {
  color: var(--color-text);
  text-decoration: none;
}

.nav__github svg {
  width: 18px;
  height: 18px;
  fill: rgba(29, 29, 31, 0.8);
  transition: fill 0.2s ease;
}

.nav__github:hover svg {
  fill: var(--color-text);
}

@media (max-width: 768px) {
  .nav__links li:not(.nav__contact-li):not(.nav__github-li) {
    display: none;
  }
}

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

.hero {
  padding-top: calc(var(--nav-height) + clamp(4rem, 10vh, 8rem));
  padding-bottom: clamp(4rem, 8vh, 7rem);
  text-align: center;
  background: linear-gradient(180deg, #fbfbfd 0%, #ffffff 70%);
}

.hero__eyebrow {
  font-size: clamp(1rem, 0.9rem + 0.5vw, 1.3125rem);
  font-weight: 600;
  color: var(--color-text-secondary);
  letter-spacing: 0.02em;
  margin-bottom: 1.5rem;
}

.hero__title {
  font-size: var(--text-hero);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.05;
}

.hero__sub {
  font-size: var(--text-sub);
  color: var(--color-text-secondary);
  max-width: 34em;
  margin: 1.75rem auto 0;
  line-height: 1.55;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
  margin-top: 2.5rem;
}

/* ---------- 数据条 ---------- */

.stats {
  padding-block: clamp(3rem, 5vw, 5rem);
  border-top: 1px solid var(--color-hairline);
  border-bottom: 1px solid var(--color-hairline);
}

.stats__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  text-align: center;
}

.stat__value {
  font-size: clamp(2.25rem, 1.5rem + 3vw, 3.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  background: var(--gradient-soft);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.stat__label {
  margin-top: 0.4rem;
  font-size: var(--text-caption);
  color: var(--color-text-secondary);
}

@media (max-width: 768px) {
  .stats__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ---------- 职业旅程 ---------- */

.journey__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.journey-card {
  background: var(--color-bg-alt);
  border-radius: var(--radius-card);
  padding: clamp(1.75rem, 3vw, 2.5rem);
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
  transition: transform 0.5s var(--ease-out-expo), box-shadow 0.5s var(--ease-out-expo);
}

.journey-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.08);
}

.journey-card__step {
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
}

.journey-card__title {
  font-size: clamp(1.375rem, 1.2rem + 0.8vw, 1.75rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.2;
}

.journey-card__body {
  color: var(--color-text-secondary);
  line-height: 1.65;
}

.journey-card__tags {
  margin-top: auto;
  padding-top: 0.75rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-pill);
  padding: 0.3em 0.85em;
  white-space: nowrap;
}

@media (max-width: 920px) {
  .journey__grid {
    grid-template-columns: 1fr;
  }
}

/* ---------- 暗色 bento（媒体 / AI） ---------- */

.bento {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 1.25rem;
}

.bento-card {
  grid-column: span 3;
  background: var(--color-surface-dark);
  border: 1px solid var(--color-hairline-on-dark);
  border-radius: var(--radius-card);
  padding: clamp(1.75rem, 3vw, 2.5rem);
  transition: transform 0.5s var(--ease-out-expo), border-color 0.5s ease;
}

.bento-card:hover {
  transform: translateY(-6px);
  border-color: rgba(255, 255, 255, 0.3);
}

.bento-card--wide {
  grid-column: span 6;
}

.bento-card--third {
  grid-column: span 2;
}

.bento-card__kicker {
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-link-on-dark);
  margin-bottom: 0.9rem;
}

.bento-card__title {
  font-size: clamp(1.375rem, 1.2rem + 1vw, 1.875rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.25;
  color: var(--color-text-on-dark);
}

.bento-card__body {
  margin-top: 0.8rem;
  color: var(--color-text-secondary-on-dark);
  line-height: 1.65;
}

.bento-card__brands {
  margin-top: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.bento-card__brands .tag {
  color: var(--color-text-secondary-on-dark);
  border-color: var(--color-hairline-on-dark);
}

@media (max-width: 920px) {
  .bento-card,
  .bento-card--third,
  .bento-card--wide {
    grid-column: span 6;
  }
}

/* ---------- 开源作品 ---------- */

.repos__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.repo-card {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  background: var(--color-bg-alt);
  border-radius: 20px;
  padding: 1.75rem;
  color: inherit;
  transition: transform 0.5s var(--ease-out-expo), box-shadow 0.5s var(--ease-out-expo);
}

.repo-card:hover {
  text-decoration: none;
  transform: translateY(-5px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08);
}

.repo-card__name {
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--color-text);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.repo-card__name::after {
  content: "↗";
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
}

.repo-card__desc {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  line-height: 1.6;
  flex: 1;
}

.repo-card__lang {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-accent);
}

@media (max-width: 920px) {
  .repos__grid {
    grid-template-columns: 1fr;
  }
}

/* ---------- 技术栈 ---------- */

.stack__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

.stack-card {
  background: var(--color-bg);
  border-radius: var(--radius-card);
  padding: clamp(1.75rem, 3vw, 2.5rem);
}

.stack-card__title {
  font-size: 1.3125rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 1.1rem;
}

.stack-card__list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.stack-card__list .tag {
  font-size: 0.8125rem;
  background: var(--color-bg-alt);
  border-color: transparent;
  color: var(--color-text);
}

@media (max-width: 768px) {
  .stack__grid {
    grid-template-columns: 1fr;
  }
}

/* ---------- 理念 ---------- */

.philosophy__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(1.5rem, 3vw, 3rem);
  margin-top: var(--space-headline-gap);
}

.philosophy-item__num {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--color-link-on-dark);
  margin-bottom: 0.8rem;
}

.philosophy-item__title {
  font-size: 1.3125rem;
  font-weight: 700;
  color: var(--color-text-on-dark);
  margin-bottom: 0.6rem;
}

.philosophy-item__body {
  color: var(--color-text-secondary-on-dark);
  line-height: 1.7;
}

.philosophy__quote {
  margin-top: var(--space-headline-gap);
  padding-top: var(--space-headline-gap);
  border-top: 1px solid var(--color-hairline-on-dark);
  text-align: center;
  font-size: clamp(1.375rem, 1.1rem + 1.5vw, 2rem);
  font-weight: 600;
  letter-spacing: 0.02em;
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

@media (max-width: 920px) {
  .philosophy__grid {
    grid-template-columns: 1fr;
  }
}

/* ---------- 联系 ---------- */

.contact {
  text-align: center;
}

.contact__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
  margin-top: 2.5rem;
}

.contact__meta {
  margin-top: 2rem;
  font-size: var(--text-caption);
  color: var(--color-text-secondary);
}

/* ---------- 页脚 ---------- */

.footer {
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-hairline);
  padding-block: 1.5rem;
  font-size: 0.75rem;
  color: var(--color-text-secondary);
}

.footer__inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem;
}

.footer a {
  color: var(--color-text-secondary);
  text-decoration: underline;
}

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