/* File Beacon: dark-tech radar system.
   Type: Archivo Expanded (display, the code) / Geist Mono (labels, data).
   One accent that only ever means connection state; the page earns its
   green when the peers link. Sharp corners everywhere, hairlines over cards. */

:root {
  /* dark graphite, slight green cast (default theme) */
  --bg: #0C0F0D;
  --bg-raise: #12161380;
  --ink: #E9EDEA;
  --soft: #96A19A;
  --line: #242B26;

  --accent: #4CC978;  /* linked; also the brand color */
  --amber: #D9A961;   /* seeking: hosting, joining, linking */
  --red: #DF6E5F;     /* failed, disconnected */
  --dust: #6E7770;    /* idle */

  --state: var(--dust);

  --font-d: "Archivo", "Arial Narrow", sans-serif;
  --font-m: "Geist Mono", ui-monospace, monospace;

  color-scheme: dark;
}

:root[data-theme="light"] {
  --bg: #F2F4F1;
  --bg-raise: #E9ECE880;
  --ink: #131714;
  --soft: #5A635C;
  --line: #D3D8D2;

  --accent: #177D43;
  --amber: #9A6414;
  --red: #B23B2E;
  --dust: #78827A;

  color-scheme: light;
}

body[data-state="hosting"],
body[data-state="joining"],
body[data-state="connecting"] { --state: var(--amber); }
body[data-state="connected"]  { --state: var(--accent); }
body[data-state="disconnected"],
body[data-state="error"]      { --state: var(--red); }

* { box-sizing: border-box; margin: 0; padding: 0; }

html { height: 100%; }

body {
  min-height: 100%;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-m);
  font-size: 0.9375rem;
  line-height: 1.55;
  display: flex;
  flex-direction: column;
  padding: clamp(1.25rem, 4vw, 3rem);
  -webkit-font-smoothing: antialiased;
}

[hidden] { display: none !important; }

/* ------------------------------------------------------------- masthead */
.masthead {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--line);
}

.wordmark {
  font-family: var(--font-d);
  font-stretch: 125%;
  font-weight: 700;
  font-size: 0.9375rem;
  letter-spacing: 0.18em;
}

.wordmark-glyph {
  display: inline-block;
  width: 0.55em;
  height: 0.55em;
  border-radius: 50%;
  border: 2px solid var(--accent);
  margin-right: 0.65em;
}

.masthead-side {
  display: flex;
  align-items: baseline;
  gap: 1.75rem;
}

.statusline {
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--state);
}

.status-dot {
  display: inline-block;
  width: 0.55em;
  height: 0.55em;
  border-radius: 50%;
  background: var(--state);
  margin-right: 0.6em;
}

body[data-state="hosting"] .status-dot,
body[data-state="joining"] .status-dot,
body[data-state="connecting"] .status-dot {
  animation: beacon 1.6s ease-out infinite;
}

@keyframes beacon {
  0%   { box-shadow: 0 0 0 0 color-mix(in srgb, var(--state) 45%, transparent); }
  100% { box-shadow: 0 0 0 0.7em transparent; }
}

.btn-theme {
  font: 500 0.6875rem/1 var(--font-m);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--soft);
  background: none;
  border: none;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 0.35em;
  padding: 0;
}
.btn-theme:hover { color: var(--ink); }

/* ---------------------------------------------------------------- views */
main { flex: 1; display: flex; }

.view {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  gap: 1.75rem;
  padding: clamp(2rem, 6vh, 4.5rem) 0;
  max-width: 72rem;
  width: 100%;
  margin: 0 auto;
}

.display {
  font-family: var(--font-d);
  font-stretch: 125%;
  font-weight: 700;
  font-size: clamp(2rem, 4.2vw, 3.4rem);
  line-height: 1.04;
  letter-spacing: -0.01em;
  text-transform: uppercase;
}

.display-small {
  font-size: clamp(1.6rem, 4vw, 2.6rem);
  text-transform: none;
}

.lede { max-width: 30em; color: var(--soft); }

.label {
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--soft);
}

.hint { font-size: 0.8125rem; color: var(--soft); }

.error-line {
  color: var(--red);
  font-size: 0.875rem;
  border-left: 3px solid var(--red);
  padding-left: 0.75rem;
}

/* --------------------------------------------------------------- buttons */
.btn {
  font: 600 0.8125rem/1 var(--font-m);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--ink);
  padding: 0.95em 1.7em;
  cursor: pointer;
  transition: background-color 120ms ease, color 120ms ease, transform 80ms ease;
}

.btn:hover { background: var(--ink); color: var(--bg); }
.btn:active { transform: translateY(1px); }

.btn-primary { background: var(--ink); color: var(--bg); }
.btn-primary:hover { background: transparent; color: var(--ink); }

.btn-quiet {
  border-color: transparent;
  color: var(--soft);
  text-decoration: underline;
  text-underline-offset: 0.35em;
  padding-left: 0;
  padding-right: 0;
}
.btn-quiet:hover { background: transparent; color: var(--ink); }

.btn-small { padding: 0.55em 0.95em; font-size: 0.6875rem; }

:is(button, a, input, [tabindex]):focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* ----------------------------------------------------------------- hero */
.view-landing {
  justify-content: flex-start;
  gap: 0;
  padding-top: 0;
}

.hero {
  width: 100%;
  min-height: min(34rem, 74vh);
  display: grid;
  grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
  align-items: center;
  gap: clamp(2rem, 6vw, 5rem);
  padding: clamp(2rem, 5vh, 4rem) 0;
}

.hero-copy {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1.75rem;
}

.gate-actions {
  display: flex;
  align-items: flex-end;
  gap: 2.5rem;
  flex-wrap: wrap;
  border-top: 1px solid var(--line);
  padding-top: 1.75rem;
  width: 100%;
}

.gate-host { display: grid; gap: 0.6rem; }

.gate-join { display: grid; gap: 0.6rem; }
.gate-join label {
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--soft);
}

.join-row { display: flex; gap: 0.75rem; align-items: stretch; }

#join-code {
  font: 600 1.4rem/1 var(--font-m);
  letter-spacing: 0.35em;
  width: 6.5ch;
  padding: 0.45em 0 0.45em 0.35em;
  background: transparent;
  border: none;
  border-bottom: 2px solid var(--ink);
  color: var(--ink);
}
#join-code::placeholder { color: var(--line); }

/* ------------------------------------------------------------ the radar */
.radar {
  position: relative;
  width: 100%;
  max-width: 420px;
  aspect-ratio: 1;
  justify-self: end;
}

.radar-ring {
  position: absolute;
  border: 1px solid var(--line);
  border-radius: 50%;
}
.radar-ring.r1 { inset: 0; }
.radar-ring.r2 { inset: 16.5%; }
.radar-ring.r3 { inset: 33%; }

.radar-grid-h, .radar-grid-v {
  position: absolute;
  background: var(--line);
}
.radar-grid-h { left: 0; right: 0; top: 50%; height: 1px; }
.radar-grid-v { top: 0; bottom: 0; left: 50%; width: 1px; }

.radar-sweep {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: conic-gradient(
    from 0deg,
    transparent 0deg,
    transparent 290deg,
    color-mix(in srgb, var(--accent) 22%, transparent) 355deg,
    color-mix(in srgb, var(--accent) 55%, transparent) 360deg
  );
  animation: sweep 7s linear infinite;
}

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

.radar-core {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 8px;
  height: 8px;
  margin: -4px 0 0 -4px;
  border-radius: 50%;
  background: var(--accent);
  animation: beacon 2.4s ease-out infinite;
}

/* -------------------------------------------------------------- landing */
.landing-section {
  width: 100%;
  border-top: 1px solid var(--line);
  padding: clamp(2.5rem, 7vh, 4.5rem) 0;
  display: grid;
  gap: 2rem;
}

.section-title {
  font-family: var(--font-d);
  font-stretch: 125%;
  font-weight: 700;
  font-size: clamp(1.35rem, 3vw, 2rem);
  letter-spacing: 0.01em;
  text-transform: uppercase;
}

.section-title.statement {
  font-size: clamp(1.9rem, 4.5vw, 3.25rem);
  text-transform: none;
  max-width: 22ch;
  line-height: 1.05;
}

.steps {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(1.5rem, 4vw, 3.5rem);
}

.steps li {
  display: grid;
  gap: 0.65rem;
  align-content: start;
  border-top: 2px solid var(--ink);
  padding-top: 1.25rem;
}

.step-num {
  font-family: var(--font-d);
  font-stretch: 125%;
  font-weight: 300;
  font-size: clamp(2.75rem, 6vw, 4.5rem);
  line-height: 1;
  color: var(--soft);
}

.steps h3 {
  font-family: var(--font-d);
  font-stretch: 125%;
  font-weight: 600;
  font-size: 1rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.steps p { color: var(--soft); font-size: 0.875rem; max-width: 24em; }

.prose { max-width: 46em; color: var(--soft); }

.qa { display: grid; }

.qa-row {
  display: grid;
  grid-template-columns: minmax(12rem, 18rem) 1fr;
  gap: 1rem 3rem;
  padding: 1.5rem 0;
}
.qa-row + .qa-row { border-top: 1px solid var(--line); }

.qa-row dt {
  font-family: var(--font-d);
  font-stretch: 125%;
  font-weight: 600;
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.qa-row dd { color: var(--soft); max-width: 46em; }

/* ---------------------------------------------------------------- lobby */
.code {
  display: flex;
  gap: clamp(0.5rem, 2vw, 1.25rem);
}

.code .digit {
  font-family: var(--font-d);
  font-stretch: 125%;
  font-weight: 750;
  font-variant-numeric: tabular-nums;
  font-size: clamp(4rem, 17vw, 11rem);
  line-height: 1.1;
  padding: 0 clamp(0.75rem, 2.5vw, 2rem);
  border: 1px solid var(--line);
  border-bottom: 3px solid var(--state);
  background: var(--bg-raise);
}

.lobby-row {
  display: flex;
  align-items: center;
  gap: 2rem;
  flex-wrap: wrap;
}

.waiting { color: var(--state); font-size: 0.8125rem; }

.pulse {
  display: inline-block;
  width: 0.6em;
  height: 0.6em;
  border-radius: 50%;
  background: var(--state);
  margin-right: 0.6em;
  animation: beacon 1.6s ease-out infinite;
}

.ttl { color: var(--soft); margin-left: 1em; font-variant-numeric: tabular-nums; }

/* -------------------------------------------------------------- session */
.session-head { display: grid; gap: 0.4rem; }

.peer-desc {
  font-family: var(--font-d);
  font-stretch: 125%;
  font-weight: 700;
  font-size: clamp(1.5rem, 3.5vw, 2.4rem);
  line-height: 1.1;
  text-transform: uppercase;
}

/* radar-target corner brackets, colored by connection state */
.dropzone {
  position: relative;
  width: 100%;
  border: 1px solid var(--line);
  padding: clamp(1.75rem, 5vh, 3.5rem) clamp(1.25rem, 4vw, 2.5rem);
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  transition: background-color 120ms ease;
}

.dropzone::before {
  content: "";
  position: absolute;
  inset: -1px;
  pointer-events: none;
  --tick: var(--state);
  background:
    linear-gradient(var(--tick) 0 0) 0 0 / 20px 2px,
    linear-gradient(var(--tick) 0 0) 0 0 / 2px 20px,
    linear-gradient(var(--tick) 0 0) 100% 0 / 20px 2px,
    linear-gradient(var(--tick) 0 0) 100% 0 / 2px 20px,
    linear-gradient(var(--tick) 0 0) 0 100% / 20px 2px,
    linear-gradient(var(--tick) 0 0) 0 100% / 2px 20px,
    linear-gradient(var(--tick) 0 0) 100% 100% / 20px 2px,
    linear-gradient(var(--tick) 0 0) 100% 100% / 2px 20px;
  background-repeat: no-repeat;
}

body.dragging .dropzone {
  background: color-mix(in srgb, var(--state) 9%, var(--bg));
}
body.dragging .dropzone::before { --tick: var(--state); inset: -3px; }

.dropzone-hint { color: var(--soft); font-size: 0.8125rem; }

/* ------------------------------------------------------------ transfers */
.transfers { list-style: none; width: 100%; }

.transfer {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  padding: 1rem 0;
}
.transfer + .transfer { border-top: 1px solid var(--line); }

.ring-wrap { position: relative; width: 48px; height: 48px; flex-shrink: 0; }

.ring { width: 48px; height: 48px; transform: rotate(-90deg); }

.ring-track { fill: none; stroke: var(--line); stroke-width: 3; }

.ring-fill {
  fill: none;
  stroke: var(--state);
  stroke-width: 3;
  stroke-linecap: butt;
  stroke-dasharray: 125.664;
  stroke-dashoffset: 125.664;
  transition: stroke-dashoffset 150ms linear;
}

.transfer[data-status="complete"] .ring-fill { stroke: var(--accent); }
.transfer[data-status="failed"] .ring-fill,
.transfer[data-status="cancelled"] .ring-fill { stroke: var(--red); }

.ring-pct {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-size: 0.6875rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.transfer-body { flex: 1; min-width: 0; display: grid; gap: 0.15rem; }

.transfer-name {
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.transfer-meta {
  font-size: 0.75rem;
  color: var(--soft);
  display: flex;
  gap: 1em;
  flex-wrap: wrap;
}

.transfer-dir { letter-spacing: 0.12em; text-transform: uppercase; }

.transfer[data-status="complete"] .transfer-dir::after   { content: " / done"; color: var(--accent); }
.transfer[data-status="failed"] .transfer-dir::after     { content: " / failed"; color: var(--red); }
.transfer[data-status="cancelled"] .transfer-dir::after  { content: " / cancelled"; color: var(--red); }
.transfer[data-status="queued"] .transfer-dir::after     { content: " / queued"; }

.transfer-actions { display: flex; gap: 0.5rem; align-items: center; }

.transfer-save {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 0.35em;
}

/* ------------------------------------------------------------- colophon */
.colophon {
  border-top: 1px solid var(--line);
  padding-top: 1rem;
  font-size: 0.75rem;
  color: var(--soft);
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 2rem;
  flex-wrap: wrap;
}

.colophon p { max-width: 44em; }

.credit {
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--soft);
  text-decoration: underline;
  text-underline-offset: 0.35em;
  white-space: nowrap;
}
.credit:hover { color: var(--accent); }

/* ---------------------------------------------------------------- a11y */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

@media (prefers-reduced-motion: reduce) {
  .status-dot, .pulse, .radar-core { animation: none !important; }
  .radar-sweep { animation: none; }
  .ring-fill { transition: none; }
  .btn { transition: none; }
}

/* --------------------------------------------------------------- mobile */
@media (max-width: 52rem) {
  .hero { grid-template-columns: 1fr; min-height: auto; }
  .radar { max-width: 190px; justify-self: start; order: -1; margin-top: 1.5rem; }
}

@media (max-width: 40rem) {
  .masthead { flex-direction: column; gap: 0.5rem; align-items: flex-start; }
  .masthead-side { width: 100%; justify-content: space-between; }

  .gate-actions { flex-direction: column; align-items: flex-start; gap: 1.5rem; }

  .steps { grid-template-columns: 1fr; }
  .qa-row { grid-template-columns: 1fr; gap: 0.5rem; }

  .code .digit { padding: 0 4vw; }

  .dropzone-hint { display: none; }  /* drag and drop is not a mobile pattern */
  #btn-browse { width: 100%; text-align: center; padding: 1.2em; }

  .transfer { flex-wrap: wrap; }
  .transfer-actions { width: 100%; justify-content: flex-end; }
}