:root {
  color-scheme: dark;
  --bg: #05080a;
  --bg-raised: #0a1012;
  --line: #16211f;
  --text: #e6f2ef;
  --muted: #6d8b86;
  --muted-2: #3f5652;
  --accent: #4dd8c0;
  --accent-dim: #1f6f63;
  --phosphor: #72f6b8;
  --phosphor-dim: #2d936f;
  --mono: "JetBrains Mono", ui-monospace, Menlo, Consolas, monospace;
  --sans: "Inter", system-ui, sans-serif;
  --persian: "Vazirmatn", Tahoma, var(--sans);
}

@font-face {
  font-family: "Vazirmatn";
  src: url("./fonts/Vazirmatn-Regular.woff2") format("woff2");
  font-display: swap;
  font-style: normal;
  font-weight: 400;
  unicode-range: U+0590-08FF, U+FB1D-FDFF, U+FE70-FEFF;
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: var(--bg);
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 12% 18%, rgb(77 216 192 / 7%), transparent 28rem),
    radial-gradient(circle at 86% 78%, rgb(31 111 99 / 9%), transparent 32rem),
    var(--bg);
  font-family: var(--sans);
}

body::before {
  position: fixed;
  z-index: 10;
  inset: 0;
  pointer-events: none;
  content: "";
  opacity: 0.045;
  background: repeating-linear-gradient(
    to bottom,
    transparent 0,
    transparent 3px,
    rgb(230 242 239 / 12%) 4px
  );
}

body::after {
  position: fixed;
  z-index: 0;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  width: auto;
  pointer-events: none;
  content: "";
  opacity: 0.55;
  background: radial-gradient(ellipse at center, transparent 42%, rgb(0 0 0 / 34%) 100%);
}

button,
textarea {
  font: inherit;
}

button:focus-visible,
a:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

.page-shell {
  position: relative;
  z-index: 1;
  width: min(100% - 2rem, 1180px);
  margin: 0 auto;
}

.landing {
  display: grid;
  min-height: 100vh;
  align-items: center;
  padding: 3rem 0;
}

.landing-card {
  width: min(100%, 760px);
  padding: clamp(1.5rem, 5vw, 4rem) 0;
}

.brand-lockup {
  display: flex;
  align-items: baseline;
  gap: 1rem;
}

.eyebrow,
.brand-subtitle,
.panel-bar,
.editor-footer,
.telemetry,
.status {
  font-family: var(--mono);
  text-transform: uppercase;
}

.eyebrow {
  margin: 0;
  color: var(--accent);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.18em;
}

.brand-subtitle {
  color: var(--muted-2);
  font-size: 0.64rem;
  letter-spacing: 0.14em;
}

.signal-rule {
  width: min(100%, 28rem);
  height: 1px;
  margin: 2rem 0 1.75rem;
  background: linear-gradient(90deg, var(--accent-dim), var(--line), transparent);
}

h1 {
  max-width: 10ch;
  margin: 0;
  color: var(--text);
  font-size: clamp(3.1rem, 9vw, 7rem);
  line-height: 0.94;
  letter-spacing: -0.08em;
  text-shadow: 0 0 2rem rgb(77 216 192 / 10%);
}

.lede {
  max-width: 38rem;
  margin: 2rem 0 2.25rem;
  color: var(--muted);
  font-size: clamp(1rem, 2vw, 1.2rem);
  line-height: 1.6;
}

.landing-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem 1.5rem;
}

.primary-button {
  border: 1px solid var(--accent-dim);
  border-radius: 0.2rem;
  padding: 0.9rem 1.15rem;
  color: var(--accent);
  background: rgb(10 16 18 / 92%);
  box-shadow: inset 0 0 0 1px rgb(77 216 192 / 5%), 0 0 1.5rem rgb(77 216 192 / 5%);
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  cursor: pointer;
  transition: border-color 160ms ease, background 160ms ease, box-shadow 160ms ease;
}

.primary-button::before {
  margin-right: 0.65rem;
  color: var(--muted);
  content: ">";
}

.primary-button:hover {
  border-color: var(--accent);
  background: rgb(31 111 99 / 22%);
  box-shadow: inset 0 0 0 1px rgb(77 216 192 / 12%), 0 0 2rem rgb(77 216 192 / 12%);
}

.primary-button:disabled {
  cursor: wait;
  opacity: 0.55;
}

.status {
  margin: 0;
  color: var(--muted);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
}

.status[data-state="connected"] {
  color: var(--accent);
}

.status[data-state="error"] {
  color: #e78686;
}

.telemetry {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  max-width: 36rem;
  margin: 5rem 0 0;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}

.telemetry div {
  display: grid;
  gap: 0.35rem;
}

.telemetry dt,
.telemetry dd {
  margin: 0;
}

.telemetry dt {
  color: var(--muted-2);
  font-size: 0.6rem;
  letter-spacing: 0.14em;
}

.telemetry dd {
  color: var(--muted);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
}

.editor-shell {
  display: grid;
  min-height: 100vh;
  grid-template-rows: auto 1fr auto;
  gap: 1rem;
  padding: 1.25rem 0 1rem;
}

.editor-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--line);
}

.wordmark {
  color: var(--text);
  font-family: var(--mono);
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-decoration: none;
}

.connection-cluster {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.connection-indicator {
  width: 0.45rem;
  height: 0.45rem;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0.8rem var(--accent);
}

.editor-panel {
  display: grid;
  grid-template-rows: auto 1fr;
  min-height: 0;
  border: 1px solid var(--line);
  background: rgb(10 16 18 / 72%);
  box-shadow: inset 0 0 0 1px rgb(77 216 192 / 3%), 0 1.5rem 4rem rgb(0 0 0 / 25%);
}

.editor-stage {
  position: relative;
  min-height: 0;
}

.panel-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.7rem 1rem;
  border-bottom: 1px solid var(--line);
  color: var(--muted-2);
  font-size: 0.6rem;
  letter-spacing: 0.12em;
}

.presence-cluster,
.presence-list,
.presence-user,
.direction-control {
  display: flex;
  align-items: center;
}

.presence-cluster {
  gap: 0.8rem;
  min-width: 0;
}

.presence-list {
  gap: 0.35rem;
  overflow: hidden;
}

.presence-user {
  gap: 0.3rem;
  max-width: 10rem;
  color: var(--phosphor);
  font-size: 0.58rem;
  letter-spacing: 0.04em;
  text-transform: none;
}

.presence-user > span:last-child {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.user-avatar {
  display: block;
  flex: 0 0 auto;
  border: 1px solid rgb(114 246 184 / 25%);
  border-radius: 0.15rem;
  shape-rendering: crispEdges;
}

.direction-control {
  gap: 0.4rem;
  color: var(--muted-2);
  white-space: nowrap;
}

.direction-control select {
  border: 1px solid var(--line);
  border-radius: 0.15rem;
  padding: 0.25rem 0.35rem;
  color: var(--phosphor);
  background: var(--bg-raised);
  font: 0.58rem var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.remote-cursors {
  position: absolute;
  z-index: 2;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.remote-cursor {
  position: absolute;
  width: 2px;
  height: 1.8em;
  background: var(--cursor-color);
  box-shadow: 0 0 0.8rem var(--cursor-color);
}

.remote-cursor-label {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  position: absolute;
  top: -1.35rem;
  left: 0;
  padding: 0.2rem 0.35rem;
  color: var(--bg);
  background: var(--cursor-color);
  font: 0.58rem/1 var(--mono);
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.remote-cursor-label .user-avatar {
  width: 0.9rem;
  height: 0.9rem;
  border-color: currentColor;
}

.editor {
  width: 100%;
  min-height: 70vh;
  resize: vertical;
  border: 0;
  padding: clamp(1rem, 3vw, 2rem);
  color: var(--text);
  background: transparent;
  caret-color: var(--accent);
  font: 1rem/1.8 var(--mono);
  tab-size: 4;
  unicode-bidi: plaintext;
}

.editor[data-resolved-direction="rtl"] {
  font-family: var(--persian), var(--mono);
  text-align: right;
}

.editor[data-resolved-direction="ltr"] {
  text-align: left;
}

.editor::placeholder {
  color: var(--muted-2);
}

.editor::selection {
  color: var(--text);
  background: var(--accent-dim);
}

.editor:focus {
  outline: 0;
  box-shadow: inset 0 0 0 1px rgb(77 216 192 / 18%), inset 0 0 3rem rgb(77 216 192 / 3%);
}

.editor:disabled {
  cursor: wait;
  opacity: 0.72;
}

.editor-footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 0.25rem;
  color: var(--muted-2);
  font-size: 0.58rem;
  letter-spacing: 0.12em;
}

@media (max-width: 640px) {
  .brand-lockup,
  .editor-header,
  .editor-footer,
  .panel-bar {
    align-items: flex-start;
    flex-direction: column;
  }

  .telemetry {
    gap: 0.65rem;
  }

  .telemetry dd {
    font-size: 0.58rem;
  }

  .editor-footer {
    gap: 0.35rem;
  }
}

@media (prefers-reduced-motion: reduce), (prefers-contrast: more) {
  body::before,
  body::after {
    display: none;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}