:root {
  --paper: #f2f0e8;
  --paper-deep: #e7e3d8;
  --ink: #111313;
  --muted: #6f716d;
  --line: rgba(17, 19, 19, 0.18);
  --cyan: #00e5c0;
  --cyan-dark: #007d6d;
  --white: #fffef9;
  --radius: 3px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "PingFang SC", "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
  overflow-x: hidden;
}

::selection {
  color: var(--ink);
  background: var(--cyan);
}

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

.noise {
  position: fixed;
  inset: 0;
  z-index: 20;
  opacity: 0.045;
  pointer-events: none;
  background-image:
    repeating-radial-gradient(circle at 20% 30%, #111 0 0.4px, transparent 0.7px 4px),
    repeating-radial-gradient(circle at 80% 70%, #111 0 0.35px, transparent 0.65px 5px);
  background-size: 7px 7px, 9px 9px;
}

.cursor-glow {
  position: fixed;
  width: 360px;
  height: 360px;
  border-radius: 50%;
  pointer-events: none;
  z-index: -1;
  transform: translate(-50%, -50%);
  background: radial-gradient(circle, rgba(0, 229, 192, 0.14), transparent 68%);
  transition: opacity 0.3s ease;
}

.topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10;
  height: 72px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding: 0 4vw;
  border-bottom: 1px solid var(--line);
  background: rgba(242, 240, 232, 0.88);
  backdrop-filter: blur(16px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font: 700 12px/1 "SFMono-Regular", Consolas, monospace;
  letter-spacing: 0.16em;
}

.brand-mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  color: var(--paper);
  background: var(--ink);
}

.topbar nav {
  display: flex;
  gap: clamp(20px, 4vw, 54px);
  font-size: 13px;
}

.topbar nav a {
  position: relative;
}

.topbar nav a::after {
  position: absolute;
  right: 0;
  bottom: -6px;
  left: 0;
  height: 1px;
  content: "";
  background: var(--ink);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.25s ease;
}

.topbar nav a:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

.status {
  justify-self: end;
  font: 600 11px/1 "SFMono-Regular", Consolas, monospace;
  letter-spacing: 0.12em;
}

.status i {
  display: inline-block;
  width: 7px;
  height: 7px;
  margin-right: 8px;
  border-radius: 50%;
  background: var(--cyan-dark);
  box-shadow: 0 0 0 5px rgba(0, 125, 109, 0.1);
}

main {
  padding-top: 72px;
}

.hero {
  position: relative;
  min-height: calc(100vh - 72px);
  padding: 42px 4vw 70px;
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(90deg, transparent calc(50% - 1px), rgba(17, 19, 19, 0.07) 50%, transparent calc(50% + 1px)),
    linear-gradient(rgba(17, 19, 19, 0.04) 1px, transparent 1px);
  background-size: 100% 100%, 100% 84px;
}

.hero-kicker {
  display: flex;
  justify-content: space-between;
  font: 500 10px/1 "SFMono-Regular", Consolas, monospace;
  letter-spacing: 0.18em;
  color: var(--muted);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(320px, 0.65fr);
  gap: 8vw;
  align-items: center;
  min-height: 72vh;
}

.eyebrow {
  margin: 0 0 28px;
  font-size: 14px;
  font-weight: 600;
}

.hero h1 {
  max-width: 950px;
  margin: 0;
  font-family: "Songti SC", "STSong", "Noto Serif CJK SC", serif;
  font-size: clamp(58px, 8.3vw, 138px);
  font-weight: 800;
  line-height: 0.98;
  letter-spacing: -0.055em;
}

.hero h1 em {
  position: relative;
  font-style: normal;
  color: var(--paper);
  text-shadow:
    -1px -1px 0 var(--ink),
    1px -1px 0 var(--ink),
    -1px 1px 0 var(--ink),
    1px 1px 0 var(--ink);
}

.hero h1 em::after {
  position: absolute;
  right: -12px;
  bottom: 10px;
  left: 2px;
  z-index: -1;
  height: 18%;
  content: "";
  background: var(--cyan);
  transform: rotate(-1deg);
}

.hero-intro {
  max-width: 650px;
  margin: 36px 0 0;
  padding-left: 26px;
  border-left: 3px solid var(--ink);
  color: #454744;
  font-size: clamp(15px, 1.25vw, 18px);
}

.hero-actions {
  display: flex;
  gap: 12px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  min-width: 188px;
  padding: 15px 18px;
  border: 1px solid var(--ink);
  font-size: 13px;
  font-weight: 600;
  transition: 0.25s ease;
}

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

.button.primary:hover {
  color: var(--ink);
  background: var(--cyan);
}

.button.ghost:hover {
  background: var(--white);
  transform: translateY(-3px);
}

.hero-console {
  overflow: hidden;
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  box-shadow: 14px 14px 0 var(--cyan);
  transform: rotate(1.2deg);
}

.console-top {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 12px 14px;
  color: var(--paper);
  background: #222524;
}

.console-top span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #6b706e;
}

.console-top span:first-child {
  background: var(--cyan);
}

.console-top b {
  margin-left: auto;
  font: 400 10px/1 "SFMono-Regular", Consolas, monospace;
  letter-spacing: 0.08em;
}

.console-body {
  min-height: 345px;
  padding: 24px;
  color: #f1f0e9;
  background: var(--ink);
  font: 13px/1.75 "SFMono-Regular", Consolas, monospace;
}

.console-body p {
  margin: 0 0 5px;
}

.console-body .output {
  margin: 0 0 16px 18px;
  color: #9b9e9a;
}

.console-body .cyan,
.prompt {
  color: var(--cyan);
}

.typing-line i {
  display: inline-block;
  width: 8px;
  height: 15px;
  margin-left: 3px;
  vertical-align: -2px;
  background: var(--cyan);
  animation: blink 0.8s steps(1) infinite;
}

.scroll-note {
  position: absolute;
  right: 4vw;
  bottom: 24px;
  display: flex;
  align-items: center;
  gap: 15px;
  font: 500 9px/1 "SFMono-Regular", Consolas, monospace;
  letter-spacing: 0.18em;
}

.scroll-note i {
  width: 65px;
  height: 1px;
  background: var(--ink);
  animation: stretch 2s ease-in-out infinite;
}

.manifesto,
.learning,
.now,
.closing {
  padding: 110px 4vw;
}

.manifesto {
  display: grid;
  grid-template-columns: 1fr 4fr;
  gap: 7vw;
  background: var(--ink);
  color: var(--paper);
}

.section-index {
  margin: 0;
  font: 600 10px/1.3 "SFMono-Regular", Consolas, monospace;
  letter-spacing: 0.16em;
  color: var(--cyan-dark);
}

.manifesto .section-index {
  color: var(--cyan);
}

.quote {
  max-width: 1000px;
  margin: 0;
  font-family: "Songti SC", "STSong", serif;
  font-size: clamp(30px, 4.2vw, 68px);
  font-weight: 700;
  line-height: 1.28;
  letter-spacing: -0.04em;
}

.about-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4vw;
  max-width: 900px;
  margin-top: 70px;
  color: #aeb1ac;
  font-size: 15px;
}

.learning {
  border-bottom: 1px solid var(--line);
}

.section-heading {
  display: grid;
  grid-template-columns: 1fr 2fr;
  align-items: end;
  margin-bottom: 76px;
}

.section-heading h2 {
  margin: 0;
  font-family: "Songti SC", "STSong", serif;
  font-size: clamp(44px, 6vw, 86px);
  line-height: 1.05;
  letter-spacing: -0.05em;
}

.learning-list {
  border-top: 1px solid var(--ink);
}

.learning-row {
  display: grid;
  grid-template-columns: 55px minmax(280px, 1fr) minmax(240px, 0.7fr) 32px;
  gap: 30px;
  align-items: center;
  min-height: 158px;
  border-bottom: 1px solid var(--line);
  transition: 0.35s ease;
}

.learning-row:hover {
  padding-right: 18px;
  padding-left: 18px;
  background: var(--white);
}

.row-number {
  font: 500 11px/1 "SFMono-Regular", Consolas, monospace;
  color: var(--muted);
}

.learning-row h3 {
  margin: 0 0 8px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(22px, 2.1vw, 33px);
  line-height: 1.1;
}

.learning-row p {
  max-width: 620px;
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.tags span {
  padding: 6px 9px;
  border: 1px solid var(--line);
  font: 500 9px/1 "SFMono-Regular", Consolas, monospace;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.arrow {
  font-size: 24px;
  transition: transform 0.3s ease;
}

.learning-row:hover .arrow {
  transform: translate(5px, -5px);
}

.now {
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(320px, 0.75fr);
  gap: 5vw;
  background: var(--paper-deep);
}

.now-card {
  position: relative;
  overflow: hidden;
  min-height: 620px;
  padding: clamp(32px, 5vw, 78px);
  color: var(--paper);
  background: var(--ink);
}

.now-card::before {
  position: absolute;
  top: -120px;
  right: -120px;
  width: 430px;
  height: 430px;
  border: 1px solid rgba(0, 229, 192, 0.35);
  border-radius: 50%;
  content: "";
  box-shadow:
    0 0 0 55px rgba(0, 229, 192, 0.05),
    0 0 0 110px rgba(0, 229, 192, 0.025);
}

.now-label {
  display: flex;
  align-items: center;
  gap: 10px;
  font: 600 10px/1 "SFMono-Regular", Consolas, monospace;
  letter-spacing: 0.16em;
}

.pulse {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 0 rgba(0, 229, 192, 0.6);
  animation: pulse 2s infinite;
}

.now-card h2 {
  position: relative;
  margin: 75px 0 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(90px, 14vw, 210px);
  line-height: 0.8;
  letter-spacing: -0.08em;
}

.now-subtitle {
  margin: 28px 0 0;
  color: var(--cyan);
  font: 500 11px/1 "SFMono-Regular", Consolas, monospace;
  letter-spacing: 0.2em;
}

.now-description {
  max-width: 680px;
  margin: 48px 0;
  color: #bdc0ba;
  font-size: 16px;
}

.architecture {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  padding-top: 28px;
  border-top: 1px solid #3b3e3c;
}

.architecture div {
  flex: 1;
  min-width: 112px;
}

.architecture small,
.architecture strong {
  display: block;
}

.architecture small {
  margin-bottom: 6px;
  color: #717570;
  font: 500 8px/1 "SFMono-Regular", Consolas, monospace;
  letter-spacing: 0.12em;
}

.architecture strong {
  font-size: 13px;
}

.architecture > span {
  color: var(--cyan);
}

.principles {
  padding: 25px 0;
}

.principles ol {
  padding: 0;
  margin: 70px 0 0;
  list-style: none;
}

.principles li {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 18px;
  padding: 25px 0;
  border-top: 1px solid var(--line);
}

.principles li > span {
  font: 500 10px/1 "SFMono-Regular", Consolas, monospace;
  color: var(--cyan-dark);
}

.principles p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.principles b {
  display: block;
  margin-bottom: 7px;
  color: var(--ink);
  font-family: "Songti SC", "STSong", serif;
  font-size: 22px;
}

.closing {
  text-align: center;
}

.closing > p {
  font: 500 9px/1 "SFMono-Regular", Consolas, monospace;
  letter-spacing: 0.2em;
  color: var(--cyan-dark);
}

.closing h2 {
  margin: 32px 0 45px;
  font-family: "Songti SC", "STSong", serif;
  font-size: clamp(48px, 7vw, 104px);
  line-height: 1.02;
  letter-spacing: -0.06em;
}

.closing a {
  display: inline-block;
  padding-bottom: 5px;
  border-bottom: 1px solid var(--ink);
  font-size: 13px;
}

footer {
  display: flex;
  justify-content: space-between;
  padding: 24px 4vw;
  color: #aeb1ac;
  background: var(--ink);
  font: 500 9px/1 "SFMono-Regular", Consolas, monospace;
  letter-spacing: 0.12em;
}

.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition:
    opacity 0.8s cubic-bezier(0.2, 0.75, 0.25, 1),
    transform 0.8s cubic-bezier(0.2, 0.75, 0.25, 1);
}

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

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

@keyframes stretch {
  50% { transform: scaleX(0.45); transform-origin: right; }
}

@keyframes pulse {
  70% { box-shadow: 0 0 0 10px rgba(0, 229, 192, 0); }
  100% { box-shadow: 0 0 0 0 rgba(0, 229, 192, 0); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .reveal { opacity: 1; transform: none; }
}

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

  .topbar nav {
    display: none;
  }

  .hero {
    padding-top: 30px;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 60px;
    padding: 65px 0;
  }

  .hero-console {
    width: min(100%, 520px);
  }

  .manifesto {
    grid-template-columns: 1fr;
  }

  .section-heading {
    grid-template-columns: 1fr;
    gap: 25px;
  }

  .learning-row {
    grid-template-columns: 36px 1fr 24px;
    padding: 28px 0;
  }

  .learning-row .tags {
    display: none;
  }

  .now {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 600px) {
  .topbar,
  .hero,
  .manifesto,
  .learning,
  .now,
  .closing,
  footer {
    padding-right: 22px;
    padding-left: 22px;
  }

  .topbar {
    height: 62px;
  }

  main {
    padding-top: 62px;
  }

  .brand {
    font-size: 10px;
  }

  .status {
    font-size: 9px;
  }

  .hero-kicker span:last-child {
    display: none;
  }

  .hero h1 {
    font-size: clamp(52px, 17vw, 78px);
  }

  .hero-intro {
    padding-left: 16px;
  }

  .hero-actions {
    flex-direction: column;
  }

  .button {
    width: 100%;
  }

  .hero-console {
    box-shadow: 8px 8px 0 var(--cyan);
  }

  .console-body {
    min-height: 320px;
    padding: 18px;
    font-size: 11px;
  }

  .manifesto,
  .learning,
  .now,
  .closing {
    padding-top: 80px;
    padding-bottom: 80px;
  }

  .about-columns {
    grid-template-columns: 1fr;
    margin-top: 48px;
  }

  .learning-row {
    grid-template-columns: 28px 1fr;
    gap: 12px;
  }

  .learning-row .arrow {
    display: none;
  }

  .now-card {
    min-height: 560px;
  }

  .now-card h2 {
    margin-top: 65px;
    font-size: 27vw;
  }

  .architecture {
    display: grid;
    grid-template-columns: 1fr 18px 1fr;
  }

  .architecture > span:nth-of-type(2) {
    display: none;
  }

  footer {
    flex-direction: column;
    gap: 12px;
  }

  footer span:nth-child(2) {
    display: none;
  }
}