:root {
  --blue: #126bff;
  --blue-dark: #0d47d9;
  --ink: #172033;
  --muted: #687386;
  --line: #e5ebf5;
  --soft: #f5f8fd;
  --card: rgba(255, 255, 255, 0.88);
  --shadow: 0 18px 42px rgba(31, 73, 125, 0.12);
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: "Inter", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  background:
    radial-gradient(circle at 16% 18%, rgba(18, 107, 255, 0.10), transparent 26%),
    radial-gradient(circle at 78% 16%, rgba(80, 130, 245, 0.12), transparent 24%),
    linear-gradient(180deg, #f8fbff 0%, #ffffff 46%, #f7faff 100%);
  letter-spacing: 0;
}

a {
  color: inherit;
  text-decoration: none;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(209, 218, 232, 0.85);
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: blur(14px);
}

.nav {
  max-width: 1180px;
  height: 72px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 24px;
  font-weight: 800;
}

.brand svg {
  width: 34px;
  height: 34px;
  color: var(--blue);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-links a {
  position: relative;
  min-width: 76px;
  padding: 26px 12px 24px;
  text-align: center;
  font-weight: 700;
  color: #4e5a6d;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--blue);
}

.nav-links a.active::after {
  content: "";
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: -1px;
  height: 4px;
  border-radius: 999px 999px 0 0;
  background: var(--blue);
}

.page {
  max-width: 1180px;
  margin: 0 auto;
  padding: 42px 24px 56px;
}

.hero {
  min-height: 356px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 420px;
  align-items: center;
  gap: 48px;
}

.hero-copy h1 {
  margin: 0 0 16px;
  font-size: clamp(42px, 5vw, 68px);
  line-height: 1.04;
  font-weight: 900;
}

.hero-copy .subtitle {
  margin: 0 0 22px;
  font-size: 21px;
  font-weight: 700;
  color: #566174;
}

.hero-copy p {
  max-width: 580px;
  margin: 0 0 28px;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.8;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.button {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 0 24px;
  border: 1px solid #d6dfed;
  border-radius: 7px;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 8px 20px rgba(30, 76, 130, 0.08);
  color: #233048;
  font-weight: 800;
}

.button svg {
  width: 20px;
  height: 20px;
}

.button.primary {
  border-color: var(--blue);
  background: linear-gradient(135deg, #1975ff, #075cf0);
  color: #fff;
  box-shadow: 0 14px 26px rgba(18, 107, 255, 0.28);
}

.portrait-wrap {
  position: relative;
  min-height: 330px;
  display: grid;
  place-items: center;
}

.portrait-ring {
  position: relative;
  width: min(330px, 78vw);
  aspect-ratio: 1;
  border-radius: 50%;
  padding: 10px;
  background: conic-gradient(from 18deg, var(--blue), #8db6ff 22%, transparent 22% 72%, #d7e6ff 72%, var(--blue));
  box-shadow: var(--shadow);
}

.portrait-ring img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
  border: 8px solid #fff;
  border-radius: 50%;
}

.float-badge {
  position: absolute;
  width: 58px;
  height: 58px;
  display: grid;
  place-items: center;
  border: 1px solid #e2e9f4;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 16px 32px rgba(32, 76, 126, 0.12);
  color: var(--blue);
}

.float-badge svg {
  width: 28px;
  height: 28px;
}

.badge-code {
  left: 12px;
  top: 56px;
}

.badge-terminal {
  left: 0;
  bottom: 78px;
  color: #1d293d;
}

.badge-cloud {
  right: 0;
  bottom: 76px;
}

.quick-grid,
.card-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
}

.quick-card,
.post-card,
.tool-card,
.repo-card,
.book-card,
.contact-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--card);
  box-shadow: 0 12px 26px rgba(30, 57, 93, 0.08);
}

.quick-card {
  min-height: 120px;
  padding: 20px;
  display: grid;
  grid-template-columns: 64px 1fr 22px;
  align-items: center;
  gap: 16px;
}

.icon-tile {
  width: 58px;
  height: 58px;
  display: grid;
  place-items: center;
  border-radius: 18px;
  color: #fff;
  background: linear-gradient(135deg, #477dff, #0d5cf2);
  box-shadow: inset 0 -10px 22px rgba(0, 0, 0, 0.12);
}

.icon-tile.green {
  background: linear-gradient(135deg, #61c991, #2fae69);
}

.icon-tile.purple {
  background: linear-gradient(135deg, #9369ee, #6745d6);
}

.icon-tile.orange {
  background: linear-gradient(135deg, #ff9844, #f36f22);
}

.icon-tile svg {
  width: 28px;
  height: 28px;
}

.quick-card h3,
.post-card h3,
.tool-card h3,
.repo-card h3,
.book-card h3 {
  margin: 0 0 8px;
  font-size: 20px;
}

.quick-card p,
.post-card p,
.tool-card p,
.repo-card p,
.book-card p,
.contact-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
}

.arrow {
  color: #334057;
  font-size: 28px;
}

.section-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin: 28px 0 14px;
}

.section-title h2 {
  position: relative;
  margin: 0;
  padding-left: 16px;
  font-size: 22px;
}

.section-title h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 4px;
  border-radius: 99px;
  background: var(--blue);
}

.section-title a {
  color: var(--blue);
  font-weight: 800;
}

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

.post-card,
.tool-card,
.repo-card,
.book-card,
.contact-card {
  padding: 22px;
}

.meta {
  margin-top: 20px;
  display: flex;
  align-items: center;
  gap: 8px;
  color: #7b8798;
  font-weight: 600;
}

.about-band {
  margin-top: 20px;
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(300px, 0.8fr);
  gap: 34px;
  align-items: center;
}

.about-line {
  display: grid;
  grid-template-columns: 90px minmax(0, 1fr);
  gap: 20px;
  align-items: center;
}

.avatar-small {
  width: 78px;
  height: 78px;
  border-radius: 50%;
  object-fit: cover;
  border: 5px solid #fff;
  box-shadow: 0 10px 20px rgba(32, 76, 126, 0.15);
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.tag {
  min-width: 70px;
  padding: 8px 14px;
  border: 1px solid #d7e2ef;
  border-radius: 8px;
  background: #edf5ff;
  color: #216ee7;
  text-align: center;
  font-weight: 800;
}

.tag.green {
  background: #edf9f2;
  color: #2c995b;
}

.tag.orange {
  background: #fff4e7;
  color: #e4811d;
}

.info-strip {
  margin-top: 28px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--card);
  box-shadow: 0 10px 24px rgba(30, 57, 93, 0.08);
}

.info-item {
  min-height: 84px;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px 24px;
}

.info-item + .info-item {
  border-left: 1px solid var(--line);
}

.round-icon {
  width: 46px;
  height: 46px;
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  border-radius: 50%;
  color: var(--blue);
  background: #eaf2ff;
}

.round-icon svg {
  width: 22px;
  height: 22px;
}

.page-heading {
  margin: 8px 0 26px;
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 30px;
}

.page-heading h1 {
  margin: 0 0 10px;
  font-size: 42px;
}

.page-heading p {
  max-width: 680px;
  margin: 0;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.7;
}

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

.tool-card .icon-tile,
.repo-card .icon-tile,
.book-card .icon-tile {
  margin-bottom: 18px;
}

.repo-card footer,
.tool-card footer,
.book-card footer {
  margin-top: 18px;
  display: flex;
  justify-content: space-between;
  gap: 14px;
  color: var(--blue);
  font-weight: 800;
}

.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.contact-card strong {
  display: block;
  margin-bottom: 8px;
  font-size: 20px;
}

.footer {
  margin-top: 8px;
  padding: 24px;
  color: #7b8798;
  text-align: center;
}

.beian {
  margin-top: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  color: #7b8798;
  font-size: 14px;
}

.beian img {
  width: 20px;
  height: 20px;
  object-fit: contain;
}

.to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.92);
  color: #7d8aa0;
  box-shadow: 0 12px 24px rgba(30, 57, 93, 0.12);
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px);
  transition: opacity 0.18s ease, transform 0.18s ease;
}

.to-top.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

@media (max-width: 920px) {
  .nav {
    height: auto;
    padding-top: 12px;
    padding-bottom: 0;
    flex-direction: column;
    align-items: stretch;
  }

  .brand {
    justify-content: center;
  }

  .nav-links {
    overflow-x: auto;
    justify-content: flex-start;
  }

  .hero,
  .about-band,
  .contact-layout {
    grid-template-columns: 1fr;
  }

  .portrait-wrap {
    order: -1;
  }

  .quick-grid,
  .posts,
  .wide-grid,
  .info-strip {
    grid-template-columns: 1fr 1fr;
  }

  .info-item + .info-item {
    border-left: 0;
    border-top: 1px solid var(--line);
  }
}

@media (max-width: 620px) {
  .page {
    padding: 28px 16px 42px;
  }

  .hero-copy h1,
  .page-heading h1 {
    font-size: 38px;
  }

  .quick-grid,
  .posts,
  .wide-grid,
  .info-strip {
    grid-template-columns: 1fr;
  }

  .quick-card {
    grid-template-columns: 56px 1fr 18px;
  }

  .actions .button {
    width: 100%;
  }
}