:root {
  --bg: #000;
  --fg: #f5f5f7; /* Apple off-white */
  --dim: #86868b; /* Apple secondary grey */
  --accent: #4166f5; /* ultramarine blue */
  --accent-bright: #6f8cff;
  --link: var(--accent);
  --font: "SF Mono", "Menlo", "Monaco", "Courier New", monospace;
  --col: 80ch; /* capped line length */
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--bg);
}

body {
  font-family: var(--font);
  color: var(--fg);
  min-height: 100vh;
  min-height: 100dvh;
}

/* ---- Subtle phosphor glow / vignette ---- */
.glow {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 2;
  /* faint ultramarine bloom in the center, darkened toward the edges */
  background:
    radial-gradient(
      ellipse at center,
      rgba(65, 102, 245, 0.04) 0%,
      rgba(65, 102, 245, 0.012) 38%,
      rgba(0, 0, 0, 0) 70%
    ),
    radial-gradient(
      ellipse at center,
      rgba(0, 0, 0, 0) 55%,
      rgba(0, 0, 0, 0.55) 100%
    );
}

/* ---- Fullscreen scrolling screen ---- */
.screen {
  position: relative;
  z-index: 1;
  height: 100vh;
  height: 100dvh;
  overflow-y: auto;
  cursor: text;
  font-size: 16px;
  line-height: 1.55;
}

.screen::-webkit-scrollbar {
  width: 10px;
}
.screen::-webkit-scrollbar-track {
  background: transparent;
}
.screen::-webkit-scrollbar-thumb {
  background: #4166f544;
  border-radius: 6px;
}

/* capped, centered column */
.column {
  max-width: var(--col);
  margin: 0 auto;
  padding: 28px 24px 40px;
}

.output {
  white-space: pre-wrap;
  word-break: break-word;
}

/* ---- Output blocks ---- */
.block {
  margin: 0 0 14px;
}

.block .echo {
  color: var(--dim);
}

.block .echo .prompt {
  color: var(--dim);
}

/* login MOTD */
.login {
  white-space: pre-wrap;
  color: var(--dim);
  margin-bottom: 14px;
}
.login .ok {
  color: var(--fg);
}

/* ASCII time-series art */
.art {
  margin: 0 0 12px;
  color: var(--accent);
  font-family: var(--font);
  line-height: 1.15;
  white-space: pre;
  overflow-x: auto;
}

.section-title {
  color: var(--accent);
  font-weight: bold;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 4px;
}

.error {
  color: var(--accent);
}

.hint {
  color: var(--dim);
}

p {
  margin: 0 0 10px;
}

ul {
  margin: 6px 0;
  padding-left: 20px;
}

li {
  margin: 2px 0;
}

strong {
  color: var(--accent);
  font-weight: bold;
}

em {
  color: var(--fg);
  font-style: italic;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  color: var(--accent-bright);
  text-decoration: underline;
}

code {
  color: var(--accent);
}

/* help table */
.cmd-row {
  display: flex;
}
.cmd-name {
  color: var(--link);
  min-width: 150px;
  flex: 0 0 auto;
}
.cmd-desc {
  color: var(--dim);
}

/* ---- Prompt line ---- */
.prompt-line {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
}

.prompt-line.hidden {
  display: none;
}

.prompt {
  color: var(--accent);
  margin-right: 8px;
  white-space: nowrap;
}

.input-wrap {
  position: relative;
  flex: 1 1 auto;
  display: flex;
  align-items: baseline;
  min-width: 1ch;
}

#cmd {
  background: transparent;
  border: none;
  outline: none;
  color: var(--fg);
  font-family: var(--font);
  font-size: inherit;
  line-height: inherit;
  caret-color: transparent;
  flex: 1 1 auto;
  padding: 0;
  width: 100%;
  text-shadow: inherit;
}

.caret {
  position: absolute;
  color: var(--accent);
  animation: blink 1s steps(1) infinite;
  pointer-events: none;
}

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

/* boot cursor (typing animation) */
.boot-cursor {
  animation: blink 1s steps(1) infinite;
}

/* ---- Mobile ---- */
@media (max-width: 640px) {
  .screen {
    font-size: 14px;
  }
  .column {
    padding: 18px 16px 32px;
  }
  .cmd-name {
    min-width: 110px;
  }
}