:root {
  color-scheme: light;
  --bg: #f4fbff;
  --paper: #ffffff;
  --paper-soft: #eef8f6;
  --ink: #142333;
  --muted: #667789;
  --line: rgba(20, 35, 51, 0.12);
  --teal: #2eb8a6;
  --blue: #4f8cff;
  --amber: #ff9f45;
  --rose: #d45d79;
  --shadow: 0 18px 42px rgba(39, 76, 108, 0.13);
  font-family: Inter, "Microsoft YaHei", "PingFang SC", "Hiragino Sans GB", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(115deg, rgba(46, 184, 166, 0.14) 0 18%, transparent 18% 100%),
    linear-gradient(165deg, transparent 0 58%, rgba(255, 159, 69, 0.12) 58% 100%),
    var(--bg);
  line-height: 1.7;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  content: "";
  background-image:
    linear-gradient(rgba(20, 35, 51, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(20, 35, 51, 0.045) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: linear-gradient(to bottom, black, transparent 78%);
}

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

img {
  display: block;
  max-width: 100%;
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 50;
  width: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--teal), var(--amber), var(--rose));
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(1160px, calc(100% - 32px));
  min-height: 68px;
  margin: 0 auto;
  padding: 12px 0;
  backdrop-filter: blur(16px);
}

.brand,
.nav-links {
  display: flex;
  align-items: center;
}

.brand {
  gap: 10px;
  font-weight: 800;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--paper);
  box-shadow: var(--shadow);
}

.nav-links {
  gap: 6px;
  padding: 6px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.72);
}

.nav-links a {
  padding: 8px 12px;
  border-radius: 6px;
  color: var(--muted);
  font-size: 14px;
  transition: color 180ms ease, background-color 180ms ease;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--ink);
  background: rgba(79, 140, 255, 0.1);
  outline: none;
}

.section-shell {
  width: min(1160px, calc(100% - 32px));
  margin: 0 auto;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(360px, 0.9fr);
  gap: 42px;
  align-items: center;
  min-height: calc(100vh - 68px);
  padding: 42px 0 58px;
}

.eyebrow,
.kicker,
.post-meta {
  margin: 0;
  color: var(--teal);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 12px 0 0;
  font-size: clamp(48px, 8vw, 94px);
  line-height: 1.02;
  letter-spacing: 0;
}

.hero-text {
  max-width: 640px;
  margin: 22px 0 28px;
  color: var(--muted);
  font-size: clamp(17px, 2vw, 20px);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border-radius: 8px;
  border: 1px solid var(--line);
  font-weight: 800;
  transition: transform 180ms ease, box-shadow 180ms ease, background-color 180ms ease;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-2px);
  outline: none;
}

.button.primary {
  color: #ffffff;
  background: #19364d;
  box-shadow: 0 16px 34px rgba(25, 54, 77, 0.18);
}

.button.secondary {
  background: rgba(255, 255, 255, 0.72);
}

.card-link {
  position: relative;
  display: block;
  color: inherit;
}

.card-link:focus-visible {
  outline: 3px solid rgba(79, 140, 255, 0.32);
  outline-offset: 3px;
}

.read-more {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  margin-top: 18px;
  color: var(--blue);
  font-size: 14px;
  font-weight: 800;
}

.sky-board {
  position: relative;
  min-height: 500px;
  overflow: hidden;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: #d7edf4;
  box-shadow: var(--shadow);
}

.sky-board img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.9) contrast(1.04);
}

.sky-board::after {
  position: absolute;
  inset: 0;
  content: "";
  background:
    linear-gradient(180deg, rgba(244, 251, 255, 0.16), rgba(20, 35, 51, 0.28)),
    repeating-linear-gradient(135deg, rgba(255, 255, 255, 0.18) 0 1px, transparent 1px 16px);
}

.signal-card {
  position: absolute;
  z-index: 2;
  width: min(250px, calc(100% - 32px));
  padding: 16px;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.5);
  background: rgba(255, 255, 255, 0.82);
  box-shadow: 0 16px 36px rgba(20, 35, 51, 0.16);
  backdrop-filter: blur(12px);
  animation: floatPanel 5.5s ease-in-out infinite;
}

.signal-card span {
  display: block;
  color: var(--rose);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.signal-card strong {
  display: block;
  margin-top: 8px;
  line-height: 1.45;
}

.card-a {
  top: 28px;
  left: 28px;
}

.card-b {
  right: 28px;
  bottom: 28px;
  animation-delay: 1.4s;
}

.radar-lines {
  position: absolute;
  right: 18px;
  top: 18px;
  z-index: 2;
  width: 86px;
  height: 86px;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.65);
  background:
    linear-gradient(90deg, transparent 49%, rgba(255, 255, 255, 0.6) 50%, transparent 51%),
    linear-gradient(0deg, transparent 49%, rgba(255, 255, 255, 0.6) 50%, transparent 51%);
  animation: rotateRadar 12s linear infinite;
}

.intro-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 180px 180px;
  gap: 14px;
  padding: 26px 0 62px;
}

.feature-card,
.metric-card,
.post-card,
.model-row,
.note-card {
  border-radius: 8px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.82);
  box-shadow: var(--shadow);
}

.feature-card {
  padding: 26px;
}

.feature-card h2,
.section-title h2 {
  margin: 8px 0 0;
  font-size: clamp(28px, 4vw, 46px);
  line-height: 1.14;
  letter-spacing: 0;
}

.feature-card p:last-child,
.section-title p:last-child,
.post-card p,
.model-row p,
.note-card p {
  color: var(--muted);
}

.metric-card {
  display: grid;
  align-content: center;
  min-height: 180px;
  padding: 22px;
}

.metric-card span {
  color: var(--amber);
  font-size: 56px;
  font-weight: 900;
  line-height: 1;
}

.metric-card p {
  margin: 10px 0 0;
  color: var(--muted);
}

.section-title {
  max-width: 760px;
  padding-top: 34px;
}

.post-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 14px;
  margin-top: 26px;
}

.post-card {
  grid-column: span 2;
  min-height: 250px;
  padding: 22px;
  border-top: 4px solid var(--accent);
  transition: transform 190ms ease, box-shadow 190ms ease;
}

.post-card:nth-child(4),
.post-card:nth-child(5) {
  grid-column: span 3;
}

.post-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 24px 54px rgba(39, 76, 108, 0.19);
}

.post-card h3,
.model-row h3,
.note-card h3 {
  margin: 12px 0 0;
  font-size: 21px;
  line-height: 1.35;
  letter-spacing: 0;
}

.post-card p,
.model-row p,
.note-card p {
  margin: 12px 0 0;
}

.model-section {
  padding-top: 42px;
}

.model-list {
  display: grid;
  gap: 12px;
  margin-top: 28px;
}

.model-row {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 20px;
  align-items: start;
  padding: 22px;
  transition: transform 190ms ease, border-color 190ms ease;
}

.model-row:hover {
  transform: translateX(5px);
  border-color: rgba(46, 184, 166, 0.45);
}

.model-row > span {
  color: var(--blue);
  font-size: 30px;
  font-weight: 900;
  line-height: 1;
}

.notes-section {
  padding: 52px 0 72px;
}

.note-columns {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 26px;
}

.note-card {
  min-height: 210px;
  padding: 22px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.86), rgba(238, 248, 246, 0.86));
}

.site-footer {
  width: min(1160px, calc(100% - 32px));
  margin: 0 auto;
  padding: 28px 0 42px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  text-align: center;
}

.site-footer p {
  margin: 4px 0;
}

.site-footer a {
  color: var(--blue);
}

.article-main {
  padding: 42px 0 70px;
}

.article-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 24px;
  align-items: end;
  width: min(980px, calc(100% - 32px));
  margin: 0 auto;
  padding: 34px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.92), rgba(238, 248, 246, 0.86)),
    var(--paper);
  box-shadow: var(--shadow);
}

.article-hero h1 {
  margin: 10px 0 0;
  font-size: clamp(34px, 6vw, 64px);
  line-height: 1.08;
  letter-spacing: 0;
}

.article-summary {
  margin: 18px 0 0;
  max-width: 680px;
  color: var(--muted);
  font-size: 18px;
}

.article-aside {
  display: grid;
  gap: 10px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.66);
}

.article-aside span {
  color: var(--muted);
  font-size: 13px;
}

.article-aside strong {
  font-size: 20px;
  line-height: 1.3;
}

.article-content {
  display: grid;
  gap: 16px;
  width: min(880px, calc(100% - 32px));
  margin: 22px auto 0;
}

.article-content section,
.article-nav {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.86);
  box-shadow: var(--shadow);
}

.article-content section {
  padding: 28px;
}

.article-content h2 {
  margin: 0;
  font-size: 26px;
  line-height: 1.3;
  letter-spacing: 0;
}

.article-content p {
  margin: 14px 0 0;
  color: var(--muted);
}

.article-content ul {
  margin: 14px 0 0;
  padding-left: 20px;
  color: var(--muted);
}

.article-content li + li {
  margin-top: 8px;
}

.article-quote {
  padding: 20px 22px;
  border-left: 4px solid var(--teal);
  border-radius: 8px;
  background: rgba(46, 184, 166, 0.1);
  color: var(--ink);
  font-weight: 700;
}

.article-nav {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 16px;
}

.article-nav a {
  color: var(--blue);
  font-weight: 800;
}

.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 700ms ease, transform 700ms ease;
}

.reveal.appear {
  opacity: 1;
  transform: translateY(0);
}

@keyframes floatPanel {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-12px);
  }
}

@keyframes rotateRadar {
  to {
    transform: rotate(360deg);
  }
}

@media (max-width: 920px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
    gap: 10px;
  }

  .nav-links {
    width: 100%;
    overflow-x: auto;
  }

  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .sky-board {
    min-height: 390px;
  }

  .intro-grid,
  .note-columns {
    grid-template-columns: 1fr;
  }

  .metric-card {
    min-height: 130px;
  }

  .post-card,
  .post-card:nth-child(4),
  .post-card:nth-child(5) {
    grid-column: span 6;
  }

  .article-hero {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .section-shell,
  .site-header,
  .site-footer {
    width: min(100% - 24px, 1160px);
  }

  .hero {
    padding-top: 28px;
  }

  .hero-actions {
    display: grid;
  }

  .button {
    width: 100%;
  }

  .sky-board {
    min-height: 330px;
  }

  .signal-card {
    width: calc(100% - 24px);
  }

  .card-a {
    top: 12px;
    left: 12px;
  }

  .card-b {
    right: 12px;
    bottom: 12px;
  }

  .radar-lines {
    display: none;
  }

  .feature-card,
  .metric-card,
  .post-card,
  .model-row,
  .note-card {
    padding: 18px;
  }

  .model-row {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .article-main {
    padding-top: 22px;
  }

  .article-hero,
  .article-content section {
    padding: 20px;
  }

  .article-nav {
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.001ms !important;
  }
}