:root {
  color-scheme: light;
  --ink: #17202a;
  --muted: #657282;
  --quiet: #8b97a6;
  --line: rgba(23, 32, 42, 0.12);
  --surface: rgba(255, 255, 255, 0.78);
  --paper: #fbfbf8;
  --blue: #2563eb;
  --cyan: #14b8a6;
  --amber: #d97706;
  --rose: #e11d48;
  --shadow: 0 28px 80px rgba(23, 32, 42, 0.12);
  --ease-snap: cubic-bezier(0.19, 1, 0.22, 1);
  --ease-loop: cubic-bezier(0.68, -0.55, 0.27, 1.55);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(ellipse at 16% -12%, rgba(20, 184, 166, 0.17), transparent 32rem),
    radial-gradient(ellipse at 90% 12%, rgba(37, 99, 235, 0.12), transparent 30rem),
    linear-gradient(180deg, #ffffff 0%, var(--paper) 100%);
  font-size: 16px;
  line-height: 1.65;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -3;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(23, 32, 42, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23, 32, 42, 0.045) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.85), transparent 78%);
}

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

button,
input {
  font: inherit;
}

.ambient {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}

.beam {
  position: absolute;
  width: 56vw;
  height: 9rem;
  border: 1px solid rgba(37, 99, 235, 0.12);
  background: linear-gradient(90deg, transparent, rgba(20, 184, 166, 0.13), transparent);
  transform-origin: center;
  animation: beamDrift 18s var(--ease-snap) infinite alternate;
}

.beam-one {
  top: 9vh;
  left: -16vw;
  rotate: -18deg;
}

.beam-two {
  right: -18vw;
  top: 45vh;
  rotate: 16deg;
  animation-duration: 23s;
  background: linear-gradient(90deg, transparent, rgba(37, 99, 235, 0.11), transparent);
}

.beam-three {
  left: 20vw;
  bottom: -4rem;
  rotate: -8deg;
  animation-duration: 28s;
  background: linear-gradient(90deg, transparent, rgba(217, 119, 6, 0.1), transparent);
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 80;
  width: 100%;
  height: 3px;
  transform-origin: left;
  transform: scaleX(0);
  background: linear-gradient(90deg, var(--cyan), var(--blue), var(--amber));
  box-shadow: 0 0 22px rgba(20, 184, 166, 0.35);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  border-bottom: 1px solid rgba(23, 32, 42, 0.08);
  background: rgba(255, 255, 255, 0.78);
  backdrop-filter: blur(22px) saturate(130%);
}

.nav {
  width: min(1120px, calc(100% - 36px));
  min-height: 68px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 22px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 850;
}

.brand-mark {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.82);
  box-shadow: inset 0 0 16px rgba(37, 99, 235, 0.06), 0 10px 24px rgba(23, 32, 42, 0.08);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 0.95rem;
}

.nav-links a {
  position: relative;
  min-height: 38px;
  display: inline-flex;
  align-items: center;
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 7px 13px;
  overflow: hidden;
  transition: color 320ms var(--ease-snap), border-color 320ms var(--ease-snap), background 320ms var(--ease-snap);
}

.nav-links a::before {
  content: "";
  position: absolute;
  inset: auto 12px 5px;
  height: 1px;
  transform: scaleX(0);
  transform-origin: left;
  background: currentColor;
  transition: transform 420ms var(--ease-snap);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--ink);
  border-color: var(--line);
  background: rgba(255, 255, 255, 0.78);
}

.nav-links a:hover::before,
.nav-links a.active::before {
  transform: scaleX(1);
}

.container {
  width: min(1120px, calc(100% - 36px));
  margin: 0 auto;
}

.hero {
  min-height: calc(100vh - 68px);
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(310px, 0.72fr);
  gap: clamp(30px, 6vw, 76px);
  align-items: center;
  padding: clamp(58px, 9vw, 112px) 0 72px;
}

.eyebrow {
  margin: 0 0 18px;
  color: var(--cyan);
  font-size: 0.78rem;
  font-weight: 850;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  line-height: 1.05;
  letter-spacing: 0;
}

h1 {
  margin: 0;
  max-width: 10ch;
  font-size: clamp(4.2rem, 15vw, 11rem);
  font-weight: 950;
  background:
    linear-gradient(120deg, #111827 0%, #2563eb 32%, #14b8a6 62%, #111827 100%);
  background-size: 240% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: titleSheen 8s var(--ease-snap) infinite alternate;
}

.hero-subtitle {
  max-width: 700px;
  margin: 20px 0 0;
  color: var(--muted);
  font-size: clamp(1.05rem, 1.7vw, 1.3rem);
}

.hero-actions,
.contact-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.button {
  position: relative;
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 10px 18px;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.86);
  overflow: hidden;
  font-weight: 780;
  box-shadow: 0 10px 24px rgba(23, 32, 42, 0.06);
  transition: transform 520ms var(--ease-loop), border-color 420ms var(--ease-snap), box-shadow 420ms var(--ease-snap);
}

.button::before {
  content: "";
  position: absolute;
  inset: 0;
  transform: translateX(-110%) skewX(-18deg);
  background: linear-gradient(90deg, transparent, rgba(37, 99, 235, 0.12), transparent);
  transition: transform 780ms var(--ease-snap);
}

.button:hover {
  transform: translateY(-4px);
  border-color: rgba(37, 99, 235, 0.28);
  box-shadow: 0 18px 48px rgba(37, 99, 235, 0.11);
}

.button:hover::before {
  transform: translateX(110%) skewX(-18deg);
}

.button.primary {
  color: white;
  border-color: var(--ink);
  background: var(--ink);
}

.tag {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 5px 11px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.72);
  font-size: 0.88rem;
  font-weight: 720;
}

.signal-stage {
  position: relative;
  min-height: 560px;
  perspective: 1200px;
  transform-style: preserve-3d;
}

.signal-stage::before,
.signal-stage::after {
  content: "";
  position: absolute;
  inset: 10%;
  border: 1px solid rgba(23, 32, 42, 0.1);
  border-radius: 24px;
  transform: rotate(-8deg) skew(-5deg);
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.86), rgba(255, 255, 255, 0.3)),
    rgba(255, 255, 255, 0.68);
  box-shadow: var(--shadow), inset 0 0 40px rgba(255, 255, 255, 0.8);
}

.signal-stage::after {
  inset: 17% 1% 19% 17%;
  transform: rotate(13deg) skew(7deg);
  border-color: rgba(20, 184, 166, 0.25);
  animation: framePulse 6s var(--ease-snap) infinite alternate;
}

.signal-grid {
  position: absolute;
  inset: 0;
  transform: rotate(-11deg) translateZ(-20px);
  opacity: 0.9;
  background:
    linear-gradient(90deg, rgba(37, 99, 235, 0.11) 1px, transparent 1px),
    linear-gradient(rgba(37, 99, 235, 0.11) 1px, transparent 1px);
  background-size: 34px 34px;
  mask-image: radial-gradient(ellipse, #000 0%, transparent 72%);
  animation: gridSlip 11s steps(9) infinite;
}

.signal-grid span {
  position: absolute;
  width: 10px;
  height: 10px;
  border-radius: 2px;
  background: var(--cyan);
  box-shadow: 0 0 20px rgba(20, 184, 166, 0.42);
  animation: nodeJump 4.5s var(--ease-loop) infinite;
}

.signal-grid span:nth-child(1) { top: 15%; left: 18%; }
.signal-grid span:nth-child(2) { top: 34%; right: 12%; animation-delay: -1.2s; background: var(--amber); }
.signal-grid span:nth-child(3) { right: 28%; bottom: 24%; animation-delay: -2.1s; background: var(--rose); }
.signal-grid span:nth-child(4) { left: 10%; bottom: 16%; animation-delay: -3.4s; background: var(--blue); }

.signal-core {
  position: absolute;
  left: 50%;
  top: 49%;
  width: min(74%, 390px);
  aspect-ratio: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  place-items: center;
  transform: translate(-50%, -50%) rotate(-4deg);
  border: 1px solid rgba(23, 32, 42, 0.12);
  border-radius: 30px;
  background:
    conic-gradient(from 90deg, rgba(20, 184, 166, 0.14), rgba(217, 119, 6, 0.12), rgba(37, 99, 235, 0.14), rgba(20, 184, 166, 0.14)),
    rgba(255, 255, 255, 0.76);
  box-shadow: inset 0 0 50px rgba(255, 255, 255, 0.85), 0 32px 80px rgba(23, 32, 42, 0.14);
  overflow: hidden;
  animation: coreFloat 9s var(--ease-snap) infinite alternate;
}

.signal-core::before {
  content: "";
  position: absolute;
  inset: -40%;
  background:
    repeating-conic-gradient(from 0deg, rgba(37, 99, 235, 0.12) 0 2deg, transparent 2deg 13deg);
  animation: rotateLong 24s linear infinite;
}

.signal-core::after {
  content: "";
  position: absolute;
  inset: 12px;
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.88);
}

.signal-core span {
  position: relative;
  z-index: 1;
  font-size: clamp(5.4rem, 11vw, 9rem);
  font-weight: 950;
  line-height: 1;
}

.signal-core span:last-child {
  color: var(--blue);
  transform: translateY(0.2em);
}

.signal-band {
  position: absolute;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, transparent, var(--cyan), var(--blue), transparent);
  filter: drop-shadow(0 0 10px rgba(20, 184, 166, 0.38));
  transform-origin: left;
}

.band-a {
  width: 74%;
  left: 2%;
  top: 22%;
  rotate: 18deg;
  animation: bandRace 3.8s var(--ease-snap) infinite;
}

.band-b {
  width: 82%;
  right: -6%;
  top: 57%;
  rotate: -23deg;
  animation: bandRace 4.6s var(--ease-snap) infinite reverse;
}

.band-c {
  width: 62%;
  left: 17%;
  bottom: 15%;
  rotate: 9deg;
  animation: bandRace 5.2s var(--ease-snap) infinite;
}

.signal-card {
  position: absolute;
  z-index: 3;
  width: 168px;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 15px 16px;
  background: rgba(255, 255, 255, 0.78);
  box-shadow: 0 18px 48px rgba(23, 32, 42, 0.1);
  backdrop-filter: blur(18px);
  animation: cardOrbit 8s var(--ease-snap) infinite alternate;
}

.signal-card strong {
  display: block;
  color: var(--ink);
  font-size: 1.55rem;
  line-height: 1;
}

.signal-card span {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  font-size: 0.86rem;
}

.card-a { top: 9%; right: 3%; }
.card-b { left: 0; bottom: 18%; animation-delay: -2.2s; }
.card-c { right: 8%; bottom: 6%; animation-delay: -4s; }

.section {
  padding: clamp(70px, 10vw, 132px) 0;
}

.page-shell {
  min-height: calc(100vh - 68px);
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 28px;
}

.section h2 {
  margin: 0;
  font-size: clamp(2.1rem, 6vw, 5.2rem);
  font-weight: 930;
}

.section-kicker {
  max-width: 700px;
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 1.06rem;
}

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

.topic-chip {
  position: relative;
  min-height: 54px;
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 12px 20px;
  background: rgba(255, 255, 255, 0.76);
  color: var(--ink);
  font-weight: 850;
  box-shadow: 0 12px 30px rgba(23, 32, 42, 0.06);
  animation: laneShift 7s var(--ease-snap) infinite alternate;
  animation-delay: calc(var(--i) * -0.8s);
}

.blog-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 20px;
}

.search {
  width: min(410px, 100%);
  min-height: 48px;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 10px 16px;
  color: var(--ink);
  outline: none;
  background: rgba(255, 255, 255, 0.86);
  transition: border-color 320ms var(--ease-snap), box-shadow 320ms var(--ease-snap);
}

.search:focus {
  border-color: rgba(37, 99, 235, 0.42);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.08);
}

.post-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.post-card {
  position: relative;
  min-height: 246px;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 24px;
  background: rgba(255, 255, 255, 0.8);
  overflow: hidden;
  box-shadow: 0 16px 46px rgba(23, 32, 42, 0.07);
  transition: transform 680ms var(--ease-snap), border-color 420ms var(--ease-snap), box-shadow 420ms var(--ease-snap);
}

.post-card::before {
  content: "";
  position: absolute;
  left: 24px;
  right: 24px;
  top: 20px;
  height: 2px;
  transform: scaleX(0.2);
  transform-origin: left;
  background: linear-gradient(90deg, var(--cyan), var(--blue), var(--amber));
  transition: transform 720ms var(--ease-snap);
}

.post-card:hover {
  transform: translateY(-8px) rotate(-0.35deg);
  border-color: rgba(37, 99, 235, 0.24);
  box-shadow: 0 24px 70px rgba(23, 32, 42, 0.12);
}

.post-card:hover::before {
  transform: scaleX(1);
}

.post-card time,
.post-meta {
  color: var(--quiet);
  font-size: 0.92rem;
}

.post-card h3 {
  margin: 18px 0 12px;
  font-size: clamp(1.35rem, 2.5vw, 1.85rem);
}

.post-card p {
  margin: 0 0 18px;
  color: var(--muted);
}

.post-card .tags {
  margin-top: auto;
}

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

.article {
  max-width: 840px;
  min-height: calc(100vh - 68px);
  padding: clamp(72px, 10vw, 120px) 0;
}

.article h1 {
  max-width: 13ch;
  font-size: clamp(2.8rem, 8vw, 5.8rem);
}

.article-body {
  margin-top: 36px;
  color: #2f3a46;
  font-size: 1.08rem;
}

.article-body h2 {
  margin-top: 42px;
  color: var(--ink);
  font-size: 1.7rem;
}

.article-body pre {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 18px;
  color: #f8fafc;
  background: #17202a;
}

.site-footer {
  padding: 42px 0 54px;
  border-top: 1px solid rgba(23, 32, 42, 0.08);
  color: var(--muted);
  background: rgba(255, 255, 255, 0.5);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.empty {
  display: none;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 14px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.76);
}

.reveal,
.reveal-item {
  opacity: 0;
  transform: translateY(34px) scale(0.985);
  transition:
    opacity 900ms var(--ease-snap),
    transform 900ms var(--ease-snap);
}

.reveal.is-visible,
.reveal-item.is-visible {
  opacity: 1;
  transform: translateY(0) scale(1);
}

@keyframes titleSheen {
  0% { background-position: 0% 50%; filter: drop-shadow(0 0 0 rgba(37, 99, 235, 0)); }
  100% { background-position: 100% 50%; filter: drop-shadow(0 0 20px rgba(37, 99, 235, 0.12)); }
}

@keyframes beamDrift {
  0% { transform: translate3d(-3vw, -2vh, 0) scaleX(0.86); opacity: 0.36; }
  58% { transform: translate3d(8vw, 7vh, 0) scaleX(1.18); opacity: 0.66; }
  100% { transform: translate3d(2vw, -5vh, 0) scaleX(0.94); opacity: 0.42; }
}

@keyframes framePulse {
  0% { transform: rotate(13deg) skew(7deg) translate3d(-8px, 12px, 0); }
  100% { transform: rotate(18deg) skew(2deg) translate3d(10px, -6px, 0); }
}

@keyframes gridSlip {
  0% { background-position: 0 0; }
  100% { background-position: 136px 68px; }
}

@keyframes nodeJump {
  0%, 100% { transform: translate3d(0, 0, 0) scale(1); }
  35% { transform: translate3d(28px, -18px, 0) scale(1.7); }
  70% { transform: translate3d(-16px, 24px, 0) scale(0.82); }
}

@keyframes coreFloat {
  0% { transform: translate(-50%, -50%) rotate(-4deg) translate3d(-10px, 12px, 0); }
  46% { transform: translate(-50%, -50%) rotate(2deg) translate3d(16px, -8px, 0); }
  100% { transform: translate(-50%, -50%) rotate(-8deg) translate3d(4px, 18px, 0); }
}

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

@keyframes bandRace {
  0% { clip-path: inset(0 92% 0 0); opacity: 0.35; }
  38% { clip-path: inset(0 12% 0 16%); opacity: 1; }
  100% { clip-path: inset(0 0 0 92%); opacity: 0.2; }
}

@keyframes cardOrbit {
  0% { transform: translate3d(-8px, 14px, 80px) rotate(-2deg); }
  55% { transform: translate3d(18px, -12px, 120px) rotate(3deg); }
  100% { transform: translate3d(4px, 18px, 100px) rotate(-1deg); }
}

@keyframes laneShift {
  0% { transform: translateX(0) skewX(0deg); }
  100% { transform: translateX(calc((var(--i) - 1) * 5px)) skewX(-1deg); }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 1ms !important;
  }
}

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

  .hero {
    min-height: auto;
  }

  .signal-stage {
    min-height: 500px;
  }

  .nav {
    align-items: flex-start;
    flex-direction: column;
    padding: 14px 0;
  }

  .nav-links {
    width: 100%;
    overflow-x: auto;
    padding-bottom: 2px;
  }
}

@media (max-width: 620px) {
  .container,
  .nav {
    width: min(100% - 24px, 1120px);
  }

  .section-head,
  .blog-toolbar {
    display: flex;
    align-items: flex-start;
    flex-direction: column;
  }

  .signal-stage {
    min-height: 410px;
  }

  .signal-card {
    width: 142px;
  }

  .card-a { right: 0; }
  .card-b { left: 0; bottom: 14%; }
  .card-c { right: 0; bottom: 0; }
}