@font-face {
  font-family: "LXGW WenKai Screen";
  src: url("./fonts/LXGWWenKaiScreen.ttf") format("truetype");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

:root {
  --paper: #ffffff;
  --paper-soft: #fbfbfb;
  --line-fine: rgba(14, 18, 22, 0.048);
  --line-bold: rgba(14, 18, 22, 0.075);
  --text: #121417;
  --text-soft: rgba(18, 20, 23, 0.52);
  --button-bg: rgba(255, 255, 255, 0.92);
  --button-line: rgba(18, 20, 23, 0.12);
  --shadow: 0 32px 90px rgba(18, 20, 23, 0.05);
  --font-display: "LXGW WenKai Screen", "Kaiti SC", "STKaiti", serif;
  --font-ui:
    ui-monospace, "SFMono-Regular", "SF Mono", "JetBrains Mono", "IBM Plex Mono",
    "Roboto Mono", "Courier New", monospace;
  --pointer-x: 50vw;
  --pointer-y: 50vh;
  --aura-opacity: 0;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  min-height: 100%;
}

body {
  position: relative;
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  overflow: hidden;
  color: var(--text);
  font-family: var(--font-display);
  background-color: var(--paper);
  background-image:
    linear-gradient(var(--paper-soft), var(--paper-soft)),
    linear-gradient(var(--line-bold) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-bold) 1px, transparent 1px),
    linear-gradient(var(--line-fine) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-fine) 1px, transparent 1px);
  background-size:
    100% 100%,
    144px 144px,
    144px 144px,
    24px 24px,
    24px 24px;
  background-position:
    center center,
    -1px -1px,
    -1px -1px,
    -1px -1px,
    -1px -1px;
  isolation: isolate;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body::before,
body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
}

body::before {
  background:
    radial-gradient(circle at 22% 16%, rgba(255, 255, 255, 0.98), transparent 28%),
    radial-gradient(circle at 80% 18%, rgba(18, 20, 23, 0.03), transparent 26%),
    radial-gradient(circle at 50% 82%, rgba(18, 20, 23, 0.03), transparent 34%);
}

body::after {
  opacity: 0.12;
  background-image: radial-gradient(rgba(18, 20, 23, 0.18) 0.35px, transparent 0.72px);
  background-size: 10px 10px;
  mask-image: linear-gradient(rgba(0, 0, 0, 0.36), transparent 85%);
}

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

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

.interaction-layer::before {
  content: "";
  position: absolute;
  left: calc(var(--pointer-x) - 18rem);
  top: calc(var(--pointer-y) - 18rem);
  width: 36rem;
  height: 36rem;
  border-radius: 999px;
  opacity: var(--aura-opacity);
  background:
    radial-gradient(circle, rgba(134, 155, 178, 0.16), rgba(18, 20, 23, 0.05) 33%, transparent 72%),
    radial-gradient(circle, rgba(255, 255, 255, 0.96), transparent 54%);
  filter: blur(18px);
  transition:
    opacity 240ms ease,
    left 120ms linear,
    top 120ms linear;
}

.download-button {
  position: fixed;
  top: 1.35rem;
  right: 1.35rem;
  z-index: 4;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 5.8rem;
  min-height: 2.9rem;
  padding: 0 1.15rem;
  border: 1px solid var(--button-line);
  border-radius: 999px;
  background: var(--button-bg);
  box-shadow: 0 8px 24px rgba(18, 20, 23, 0.04);
  font-family: var(--font-display);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  transition:
    transform 220ms ease,
    box-shadow 220ms ease,
    border-color 220ms ease,
    background 220ms ease;
}

.download-button:hover {
  transform: translateY(-1px);
  box-shadow: 0 14px 30px rgba(18, 20, 23, 0.08);
  border-color: rgba(18, 20, 23, 0.18);
}

.download-button:focus-visible {
  outline: 2px solid rgba(18, 20, 23, 0.22);
  outline-offset: 3px;
}

.page-shell {
  position: relative;
  z-index: 2;
  display: grid;
  min-height: 100vh;
  min-height: 100dvh;
  place-items: center;
  padding: 5.5rem 1.5rem 2rem;
}

.typewriter-stage {
  position: relative;
  width: 80vw;
  min-height: clamp(18rem, 50vh, 32rem);
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 1rem;
  padding: clamp(0.8rem, 2vw, 1.45rem) 0;
  text-align: center;
  transform: translate3d(0, var(--stage-lift, 0px), 0);
  transition: transform 280ms cubic-bezier(0.22, 1, 0.36, 1);
}

.typewriter-stage > * {
  position: relative;
  z-index: 1;
}

.prompt-line {
  display: inline-flex;
  align-items: center;
  justify-content: flex-start;
  width: 100%;
  margin: 0;
  padding-left: clamp(0.1rem, 0.8vw, 0.5rem);
  font-family: var(--font-display);
  color: rgba(18, 20, 23, 0.82);
  font-size: clamp(1.22rem, 1.5vw, 1.56rem);
  letter-spacing: 0.12em;
  text-align: left;
}

.prompt-line::after {
  content: "";
  flex: 1;
  min-width: 4rem;
  height: 1px;
  margin-left: 0.95rem;
  background: linear-gradient(90deg, rgba(18, 20, 23, 0.34), rgba(18, 20, 23, 0.1) 72%, transparent);
}

.prompt-mark {
  color: rgba(18, 20, 23, 0.96);
  font-weight: 800;
  text-shadow: 0 0 1px rgba(18, 20, 23, 0.14);
}

.terminal-output {
  flex: 1;
  width: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 1.15rem;
  min-height: clamp(16rem, 44vh, 28rem);
}

.typewriter-copy {
  margin: 0;
  width: min(80vw, 100%);
  min-height: calc(1.36em * 4);
  font-family: var(--font-display);
  font-size: clamp(2.05rem, 4.8vw, 4.9rem);
  font-weight: 400;
  line-height: 1.36;
  letter-spacing: 0.01em;
  text-wrap: pretty;
}

.typed-output {
  white-space: pre-wrap;
}

.interaction-hint {
  margin: 0;
  max-width: min(100%, 30rem);
  color: rgba(18, 20, 23, 0.52);
  font-family: var(--font-display);
  font-size: clamp(0.72rem, 0.92vw, 0.84rem);
  letter-spacing: 0.04em;
}

.caret {
  display: inline-block;
  width: 0.09em;
  min-width: 0.09em;
  height: 1em;
  margin-left: 0.16em;
  vertical-align: -0.09em;
  border-radius: 999px;
  background: currentColor;
  animation: blink 1s steps(1, end) infinite;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.particle,
.interaction-ripple,
.nudge-bubble {
  position: absolute;
  left: 0;
  top: 0;
  pointer-events: none;
  will-change: transform, opacity;
}

.particle {
  display: inline-grid;
  place-items: center;
  min-width: 1.15ch;
  color: rgba(70, 94, 120, 0.88);
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 0.94;
  letter-spacing: -0.04em;
  mix-blend-mode: multiply;
  text-shadow: 0 8px 24px rgba(18, 20, 23, 0.1);
  user-select: none;
  white-space: pre;
}

.particle--trail {
  color: rgba(18, 20, 23, 0.36);
}

.particle--sweep {
  color: rgba(94, 118, 142, 0.62);
}

.particle--burst {
  color: rgba(56, 80, 102, 0.86);
}

.interaction-ripple {
  width: 1.15rem;
  height: 1.15rem;
  border: 1px solid rgba(18, 20, 23, 0.15);
  border-radius: 999px;
}

.nudge-bubble {
  width: min(18rem, calc(100vw - 2rem));
  padding: 0.8rem 1rem;
  border: 1px solid rgba(18, 20, 23, 0.11);
  border-radius: 1.2rem;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 18px 42px rgba(18, 20, 23, 0.08);
  color: rgba(18, 20, 23, 0.78);
  font-family: var(--font-display);
  font-size: clamp(0.95rem, 1.1vw, 1.06rem);
  line-height: 1.45;
  text-align: center;
  text-wrap: pretty;
}

@keyframes blink {
  0%,
  49% {
    opacity: 1;
  }

  50%,
  100% {
    opacity: 0;
  }
}

@media (max-width: 720px) {
  .download-button {
    top: 1rem;
    right: 1rem;
    min-width: 5.1rem;
    min-height: 2.7rem;
  }

  .page-shell {
    padding: 4.8rem 1rem 1rem;
  }

  .typewriter-stage {
    width: min(94vw, 36rem);
    min-height: min(34rem, calc(100vh - 6.4rem));
    min-height: min(34rem, calc(100dvh - 6.4rem));
    gap: 0.82rem;
    padding: 0.5rem 0;
  }

  .terminal-output {
    min-height: min(28rem, calc(100vh - 7.8rem));
    min-height: min(28rem, calc(100dvh - 7.8rem));
  }

  .typewriter-copy {
    width: min(80vw, 100%);
    min-height: calc(1.42em * 5);
    font-size: clamp(1.85rem, 8vw, 3rem);
    line-height: 1.42;
  }

  .prompt-line {
    font-size: 1.08rem;
    padding-left: 0.2rem;
  }

  .interaction-hint {
    letter-spacing: 0.03em;
  }

  .nudge-bubble {
    width: min(15rem, calc(100vw - 1.4rem));
    padding: 0.72rem 0.88rem;
    border-radius: 1rem;
    font-size: 0.92rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .interaction-layer::before,
  .download-button {
    transition: none;
  }

  .typewriter-stage {
    transition: none;
    transform: none;
  }

  .caret {
    animation: none;
  }
}