/* ============================================================
   Sync Start — Dark High-Tech Gaming UI
   ============================================================ */

/* ----- Design tokens ----- */
:root {
  --bg:         #0a0c10;
  --bg-card:    #111520;
  --bg-card2:   #181e2e;
  --border:     #1e2a40;
  --cyan:       #00d4ff;
  --cyan-dim:   #00a0c0;
  --cyan-glow:  rgba(0, 212, 255, 0.18);
  --purple:     #8b5cf6;
  --purple-dim: #6d44d4;
  --green:      #22c55e;
  --green-glow: rgba(34, 197, 94, 0.25);
  --red:        #ef4444;
  --red-dim:    #dc2626;
  --text:       #e2e8f0;
  --text-dim:   #64748b;
  --text-muted: #334155;
  --radius:     12px;
  --radius-sm:  8px;
  --transition: 200ms ease;
}

@media (prefers-color-scheme: light) {
  /* Force dark — this app is dark-only by design */
  :root { color-scheme: dark; }
}

/* ----- Reset ----- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html { color-scheme: dark; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', 'Segoe UI', system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  min-height: 100dvh;
  overflow-x: hidden;
}

/* ----- Typography ----- */
h1, h2, h3 { line-height: 1.2; }
a { color: var(--cyan); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ----- Utility ----- */
.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;
}

/* ----- Screen management ----- */
.screen { min-height: 100dvh; display: flex; flex-direction: column; }
.screen[hidden] { display: none !important; }

/* ----- Scrollbar ----- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

/* ============================================================
   UNSUPPORTED BROWSER SCREEN
   ============================================================ */
#screen-unsupported {
  align-items: center;
  justify-content: center;
  padding: 2rem 1rem;
  text-align: center;
}

.unsupported-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  max-width: 380px;
  gap: 0.75rem;
}

.unsupported-title {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--red);
}

.unsupported-body {
  color: var(--text-dim);
  font-size: 0.9rem;
  line-height: 1.6;
}

.unsupported-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  text-align: left;
  width: 100%;
}

.unsupported-list li {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.5rem 0.8rem;
  font-size: 0.85rem;
  color: var(--red);
  border-left: 3px solid var(--red);
}

/* ============================================================
   LANDING SCREEN
   ============================================================ */
#screen-landing {
  align-items: center;
  justify-content: center;
  padding: 2rem 1rem;
  position: relative;
  overflow: hidden;
}

#screen-landing::before {
  content: '';
  position: absolute;
  top: -30%;
  left: 50%;
  width: clamp(300px, 80vw, 600px);
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle, var(--cyan-glow) 0%, transparent 70%);
  transform: translateX(-50%);
  pointer-events: none;
}

.landing-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

/* Arc Raiders–inspired diagonal-stripe logo mark */
.logo-mark {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
}

.logo-mark-sm {
  width: 24px;
  height: 24px;
}

.logo-text {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--cyan);
}

.landing-hero {
  text-align: center;
  margin-bottom: 2.5rem;
}

.landing-hero h1 {
  font-size: clamp(1.8rem, 6vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.01em;
  background: linear-gradient(135deg, var(--text) 0%, var(--cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.5rem;
}

.landing-hero p {
  color: var(--text-dim);
  font-size: 0.95rem;
  max-width: 28ch;
  margin: 0 auto;
}

/* Cards */
.landing-cards {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  width: 100%;
  max-width: 360px;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
}

.card-title {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 0.75rem;
}

/* Inputs */
.input-group {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.input-field {
  flex: 1;
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 1rem;
  padding: 0.6rem 0.9rem;
  transition: border-color var(--transition);
  outline: none;
  font-family: inherit;
}

.input-field::placeholder { color: var(--text-muted); }

.input-field:focus {
  border-color: var(--cyan-dim);
  box-shadow: 0 0 0 2px var(--cyan-glow);
}

.input-field.code-input {
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-weight: 700;
  font-size: 1.1rem;
  text-align: center;
}

.field-error {
  color: var(--red);
  font-size: 0.8rem;
  margin-top: 0.25rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  border: none;
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background var(--transition), box-shadow var(--transition), opacity var(--transition);
  padding: 0.65rem 1.2rem;
  min-height: 44px;
  user-select: none;
  white-space: nowrap;
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--cyan);
  color: #000;
}
.btn-primary:hover:not(:disabled) {
  background: var(--cyan-dim);
  box-shadow: 0 0 12px var(--cyan-glow);
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--cyan);
  color: var(--cyan);
}
.btn-outline:hover:not(:disabled) {
  background: var(--cyan-glow);
}

.btn-danger {
  background: var(--red);
  color: #fff;
}
.btn-danger:hover:not(:disabled) {
  background: var(--red-dim);
}

.btn-ghost {
  background: transparent;
  color: var(--text-dim);
  border: 1px solid var(--border);
}
.btn-ghost:hover:not(:disabled) {
  background: var(--bg-card2);
  color: var(--text);
}

.btn-full { width: 100%; }

.landing-footer {
  position: absolute;
  bottom: 1rem;
  font-size: 0.7rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

/* ============================================================
   JOIN ROOM SCREEN
   ============================================================ */
#screen-join {
  align-items: center;
  justify-content: center;
  padding: 2rem 1rem;
}

.join-card {
  width: 100%;
  max-width: 360px;
}

.join-card .room-code-large {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: 0.3em;
  color: var(--cyan);
  text-align: center;
  margin: 0.5rem 0 1.5rem;
}

/* ============================================================
   ROOM SCREEN
   ============================================================ */
#screen-room {
  padding: 0;
  justify-content: flex-start;
}

/* Header */
.room-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
  background: var(--bg-card);
  gap: 0.75rem;
  flex-wrap: wrap;
}

.room-header-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.room-code-badge {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.3rem 0.7rem;
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: 0.2em;
  color: var(--cyan);
  font-feature-settings: "tnum";
}

.host-badge,
.host-label {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  background: var(--purple);
  color: #fff;
  border-radius: 4px;
  padding: 0.15rem 0.4rem;
}

.you-label {
  color: var(--text-dim);
  font-size: 0.85em;
}

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

/* Connection status */
#connection-status {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  padding: 0.2rem 0.5rem;
  border-radius: 999px;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text-dim);
}
#connection-status[data-status="connected"] {
  color: var(--green);
  border-color: var(--green);
}
#connection-status[data-status="disconnected"] {
  color: var(--red);
  border-color: var(--red);
  animation: pulse 1.2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.5; }
}

/* ----- Main layout ----- */
.room-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 1.5rem 1rem;
  gap: 1.5rem;
}

/* ----- Countdown display ----- */
.countdown-wrap {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.countdown-svg {
  width: clamp(180px, 50vw, 280px);
  height: clamp(180px, 50vw, 280px);
}

.countdown-track {
  fill: none;
  stroke: var(--bg-card2);
  stroke-width: 6;
}

.countdown-arc {
  fill: none;
  stroke: url(#arcGradient);
  stroke-width: 6;
  stroke-linecap: round;
  stroke-dasharray: 753.98; /* 2 * π * 120 */
  stroke-dashoffset: 0;
  transform: rotate(-90deg);
  transform-origin: center;
  transition: stroke-dashoffset 50ms linear;
}

@media (prefers-reduced-motion: reduce) {
  .countdown-arc { transition: none; }
}

.countdown-center {
  position: absolute;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
}

.countdown-label {
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-dim);
}

#countdown-timer {
  font-size: clamp(1.6rem, 6vw, 2.8rem);
  font-weight: 800;
  font-feature-settings: "tnum";
  letter-spacing: -0.02em;
  color: var(--cyan);
  text-shadow: 0 0 20px var(--cyan-glow);
  font-variant-numeric: tabular-nums;
}

/* ----- Controls ----- */
.controls {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  width: 100%;
  max-width: 360px;
}

#host-controls,
#player-controls {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  width: 100%;
}

/* ----- Schedule section ----- */
.schedule-section {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  width: 100%;
}

/* ----- Sound controls ----- */
.sound-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-top: 0.25rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--border);
  width: 100%;
}

/* Red until audio is active; then a plain outlined button with a green check */
.btn-sound-off {
  background: var(--red);
  color: #fff;
  border: 1px solid var(--red);
}
.btn-sound-off:hover:not(:disabled) { background: var(--red-dim); }
.btn-sound-off:not(:disabled) { animation: soundAttention 1.4s ease-in-out infinite; }

@keyframes soundAttention {
  0%, 100% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0); opacity: 1; }
  50%      { box-shadow: 0 0 10px 3px rgba(239, 68, 68, 0.55); opacity: 0.75; }
}

@media (prefers-reduced-motion: reduce) {
  .btn-sound-off:not(:disabled) { animation: none; }
}

.btn-sound-on {
  background: transparent;
  color: var(--text-dim);
  border: 1px solid var(--border);
  cursor: default;
}
.btn-sound-on::before {
  content: '✓';
  color: var(--green);
  font-size: 1rem;
  line-height: 1;
}

.btn-sm {
  min-height: 32px;
  padding: 0.3rem 0.7rem;
  font-size: 0.75rem;
}

/* Clock offset warning */
#clock-offset-warning {
  font-size: 0.78rem;
  color: #f59e0b;
  background: rgba(245,158,11,0.1);
  border: 1px solid rgba(245,158,11,0.3);
  border-radius: var(--radius-sm);
  padding: 0.4rem 0.6rem;
  width: 100%;
  text-align: center;
}

/* ----- Participant list ----- */
.participants-section {
  width: 100%;
  max-width: 500px;
}

.participants-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
  padding: 0 0.25rem;
}

.participants-title {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.all-ready {
  font-size: 0.75rem;
  color: var(--green);
  font-weight: 600;
  opacity: 0;
  transition: opacity var(--transition);
}

.all-ready.visible { opacity: 1; }

#participant-list {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.participant-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.85rem;
  transition: opacity var(--transition);
}

.participant-item.disconnected { opacity: 0.45; }

.avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 700;
}

.avatar-cyan   { background: rgba(0,212,255,0.2);   color: var(--cyan);   border: 1.5px solid var(--cyan);   }
.avatar-purple { background: rgba(139,92,246,0.2);  color: var(--purple); border: 1.5px solid var(--purple); }
.avatar-green  { background: rgba(34,197,94,0.2);   color: var(--green);  border: 1.5px solid var(--green);  }
.avatar-orange { background: rgba(251,146,60,0.2);  color: #fb923c;       border: 1.5px solid #fb923c;       }
.avatar-pink   { background: rgba(236,72,153,0.2);  color: #ec4899;       border: 1.5px solid #ec4899;       }
.avatar-host   { background: rgba(139,92,246,0.25); color: var(--purple); border: 1.5px solid var(--purple); }
.avatar-disconnected { background: var(--bg); color: var(--text-muted); border: 1.5px solid var(--text-muted); }

.participant-info {
  flex: 1;
  min-width: 0;
}

.participant-name {
  font-size: 0.9rem;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.participant-stats {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.15rem;
  flex-shrink: 0;
}

.participant-rtt {
  font-size: 0.75rem;
  color: var(--text-dim);
  font-feature-settings: "tnum";
  white-space: nowrap;
}

.participant-offset {
  font-size: 0.7rem;
  font-feature-settings: "tnum";
  white-space: nowrap;
}

.offset-unknown { color: var(--text-muted); }
.offset-good    { color: var(--green); }
.offset-warn    { color: #f59e0b; }
.offset-bad     { color: var(--red); }

.ready-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}
.dot-ready        { background: var(--green); box-shadow: 0 0 6px var(--green); }
.dot-waiting      { background: var(--text-muted); }
.dot-disconnected { background: var(--red); }

/* ============================================================
   GO! OVERLAY
   ============================================================ */
#overlay-go {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: #051a08;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  animation: fadeInGo 300ms ease forwards;
}

#overlay-go[hidden] { display: none !important; }

@keyframes fadeInGo {
  from { opacity: 0; transform: scale(0.95); }
  to   { opacity: 1; transform: scale(1); }
}

@media (prefers-reduced-motion: reduce) {
  #overlay-go { animation: none; }
}

.go-glow {
  position: absolute;
  width: 70vmin;
  height: 70vmin;
  border-radius: 50%;
  background: radial-gradient(circle, var(--green-glow) 0%, transparent 70%);
  animation: pulseGlow 1s ease-in-out infinite alternate;
}

@keyframes pulseGlow {
  from { transform: scale(0.9); opacity: 0.7; }
  to   { transform: scale(1.1); opacity: 1; }
}

@media (prefers-reduced-motion: reduce) {
  .go-glow { animation: none; }
}

.go-text {
  position: relative;
  font-size: clamp(5rem, 28vmin, 14rem);
  font-weight: 900;
  color: var(--green);
  letter-spacing: -0.02em;
  text-shadow:
    0 0 30px rgba(34,197,94,0.8),
    0 0 80px rgba(34,197,94,0.4),
    0 0 160px rgba(34,197,94,0.2);
  user-select: none;
  line-height: 1;
}

.go-subtext {
  position: relative;
  color: var(--green);
  opacity: 0.6;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-top: 1rem;
}

/* Prevent scroll during GO */
body.overlay-active { overflow: hidden; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (min-width: 640px) {
  .room-body {
    padding: 2rem;
  }

  .participant-item {
    padding: 0.75rem 1rem;
  }

  .landing-cards {
    flex-direction: row;
    max-width: 700px;
  }

  .card { flex: 1; }
}

@media (min-width: 1024px) {
  #screen-room .room-body {
    flex-direction: row;
    align-items: flex-start;
    justify-content: center;
    gap: 3rem;
    max-width: 960px;
    margin: 0 auto;
    width: 100%;
  }

  .countdown-column {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    min-width: 320px;
  }

  .participants-section {
    flex: 1;
    max-width: 400px;
  }
}