/* ============================================================
   style.css — Signal Memory Game
   Aesthetic: retro-terminal / signal grid
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Share+Tech+Mono&family=Barlow:wght@400;600;700;900&display=swap');

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

:root {
  --bg:          #0b0e14;
  --surface:     #111620;
  --surface2:    #1a2030;
  --border:      #2a3550;
  --accent:      #00e5ff;
  --accent2:     #ff3e6c;
  --accent3:     #ffe234;
  --text:        #cdd6f4;
  --text-dim:    #6c7a96;
  --mono:        'Share Tech Mono', monospace;
  --sans:        'Barlow', sans-serif;
  --radius:      6px;
  --glow:        0 0 16px rgba(0,229,255,.35);
  --glow-err:    0 0 16px rgba(255,62,108,.45);
}

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  overflow-x: hidden;
}

/* ---------- Scanline overlay ---------- */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0,0,0,.08) 2px,
    rgba(0,0,0,.08) 4px
  );
  pointer-events: none;
  z-index: 999;
}

/* ---------- Layout ---------- */
#app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.screen {
  display: none;
  flex-direction: column;
  align-items: center;
  width: 100%;
  max-width: 560px;
  animation: fadeIn .3s ease;
}
.screen.active { display: flex; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ---------- Header / logo ---------- */
.logo {
  font-family: var(--mono);
  font-size: 1.1rem;
  color: var(--accent);
  letter-spacing: .2em;
  text-transform: uppercase;
  margin-bottom: .25rem;
  text-shadow: var(--glow);
}
.tagline {
  font-size: .8rem;
  color: var(--text-dim);
  letter-spacing: .15em;
  text-transform: uppercase;
  margin-bottom: 2rem;
}

/* ---------- Card ---------- */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  width: 100%;
  text-align: center;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  font-family: var(--mono);
  font-size: .9rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  padding: .75rem 2rem;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  transition: transform .1s, box-shadow .2s, background .2s;
}
.btn:active { transform: scale(.97); }

.btn-primary {
  background: var(--accent);
  color: var(--bg);
  font-weight: 700;
  box-shadow: var(--glow);
}
.btn-primary:hover { box-shadow: 0 0 28px rgba(0,229,255,.6); }

.btn-ghost {
  background: transparent;
  color: var(--text-dim);
  border: 1px solid var(--border);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

/* ---------- Input ---------- */
input[type="text"] {
  font-family: var(--mono);
  font-size: 1rem;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  padding: .7rem 1rem;
  width: 100%;
  outline: none;
  transition: border-color .2s, box-shadow .2s;
}
input[type="text"]:focus {
  border-color: var(--accent);
  box-shadow: var(--glow);
}

/* ---------- HUD bar ---------- */
#hud {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  margin-bottom: 1.2rem;
  padding: .6rem 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-family: var(--mono);
  font-size: .85rem;
}
.hud-item span:first-child { color: var(--text-dim); margin-right: .4rem; }
.hud-item span:last-child  { color: var(--accent); font-weight: 700; }

/* ---------- Signal grid ---------- */
#signal-display {
  display: flex;
  gap: .75rem;
  justify-content: center;
  flex-wrap: wrap;
  min-height: 80px;
  align-items: center;
  margin: 1.5rem 0;
  padding: 1rem;
  background: var(--surface2);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  width: 100%;
}

.signal-arrow {
  font-size: 2.2rem;
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
  border: 2px solid var(--border);
  background: var(--surface);
  transition: all .15s;
  user-select: none;
}
.signal-arrow.lit {
  border-color: var(--accent);
  background: rgba(0,229,255,.12);
  box-shadow: var(--glow);
  color: var(--accent);
}
.signal-arrow.correct {
  border-color: #4ade80;
  background: rgba(74,222,128,.1);
  color: #4ade80;
}
.signal-arrow.wrong {
  border-color: var(--accent2);
  background: rgba(255,62,108,.1);
  color: var(--accent2);
  animation: shake .25s ease;
}

@keyframes shake {
  0%,100% { transform: translateX(0); }
  25%      { transform: translateX(-5px); }
  75%      { transform: translateX(5px); }
}

/* ---------- Input buttons (arrows) ---------- */
#arrow-pad {
  display: grid;
  grid-template-areas:
    ". up ."
    "left down right";
  gap: .5rem;
  margin: 1rem 0;
}
#arrow-pad .arrow-btn {
  font-size: 1.6rem;
  width: 64px;
  height: 64px;
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  cursor: pointer;
  transition: all .1s;
  display: flex;
  align-items: center;
  justify-content: center;
}
#arrow-pad .arrow-btn:hover,
#arrow-pad .arrow-btn:focus {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(0,229,255,.08);
  box-shadow: var(--glow);
  outline: none;
}
#arrow-pad .arrow-btn:active {
  transform: scale(.92);
  background: rgba(0,229,255,.2);
}
[data-dir="up"]    { grid-area: up; }
[data-dir="left"]  { grid-area: left; }
[data-dir="down"]  { grid-area: down; }
[data-dir="right"] { grid-area: right; }

/* ---------- Phase label ---------- */
#phase-label {
  font-family: var(--mono);
  font-size: .8rem;
  letter-spacing: .15em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: .5rem;
  min-height: 1.2em;
}
#phase-label.active-phase { color: var(--accent3); }

/* ---------- Progress dots ---------- */
#progress-dots {
  display: flex;
  gap: .4rem;
  justify-content: center;
  margin-top: .5rem;
}
.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--border);
  transition: background .2s;
}
.dot.done    { background: var(--accent); }
.dot.pending { background: var(--text-dim); }

/* ---------- Score screen ---------- */
.score-big {
  font-family: var(--mono);
  font-size: 4rem;
  color: var(--accent);
  text-shadow: var(--glow);
  line-height: 1;
  margin: .5rem 0;
}
.score-label {
  font-size: .8rem;
  text-transform: uppercase;
  letter-spacing: .15em;
  color: var(--text-dim);
  margin-bottom: 1.5rem;
}
.score-detail {
  font-family: var(--mono);
  font-size: .85rem;
  color: var(--text-dim);
  margin-bottom: 1.5rem;
}

/* ---------- Name form ---------- */
.name-form {
  display: flex;
  gap: .5rem;
  width: 100%;
  margin-bottom: 1rem;
}
.name-form input { flex: 1; }

/* ---------- Server status badge ---------- */
#server-status {
  font-family: var(--mono);
  font-size: .7rem;
  letter-spacing: .1em;
  padding: .25rem .6rem;
  border-radius: 999px;
  margin-top: .75rem;
  display: inline-block;
}
#server-status.ok   { background: rgba(74,222,128,.15); color: #4ade80; border: 1px solid rgba(74,222,128,.3); }
#server-status.fail { background: rgba(255,62,108,.1);  color: var(--accent2); border: 1px solid rgba(255,62,108,.3); }
#server-status.idle { background: var(--surface2); color: var(--text-dim); border: 1px solid var(--border); }

/* ---------- Leaderboard mini ---------- */
.lb-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--mono);
  font-size: .82rem;
  margin-top: 1rem;
}
.lb-table th {
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--text-dim);
  font-size: .7rem;
  padding: .4rem .6rem;
  border-bottom: 1px solid var(--border);
  text-align: left;
}
.lb-table td {
  padding: .45rem .6rem;
  border-bottom: 1px solid rgba(42,53,80,.5);
}
.lb-table tr:first-child td { color: var(--accent3); }
.rank-num { color: var(--text-dim); }

/* ---------- Countdown ---------- */
#countdown-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(11,14,20,.85);
  align-items: center;
  justify-content: center;
  z-index: 100;
  flex-direction: column;
  gap: .5rem;
}
#countdown-overlay.visible { display: flex; }
#countdown-num {
  font-family: var(--mono);
  font-size: 6rem;
  color: var(--accent);
  text-shadow: var(--glow);
  animation: pulse .8s ease infinite alternate;
}
#countdown-text {
  font-size: .85rem;
  text-transform: uppercase;
  letter-spacing: .2em;
  color: var(--text-dim);
}
@keyframes pulse {
  from { opacity: .7; transform: scale(1); }
  to   { opacity: 1; transform: scale(1.08); }
}

/* ---------- Noise effect ---------- */
.noise {
  opacity: .4;
  filter: blur(0px);
  animation: noiseAnim .12s steps(1) infinite;
}
@keyframes noiseAnim {
  0%,100% { letter-spacing: .1em; }
  50%     { letter-spacing: .14em; opacity: .6; }
}

/* ---------- Utilities ---------- */
.mt1 { margin-top: .5rem; }
.mt2 { margin-top: 1rem; }
.mt3 { margin-top: 1.5rem; }
.gap { display: flex; gap: .75rem; justify-content: center; flex-wrap: wrap; }
h2 { font-size: 1.1rem; font-weight: 700; margin-bottom: 1rem; color: var(--text); }
p  { font-size: .88rem; color: var(--text-dim); line-height: 1.6; }

/* ---------- Responsive ---------- */
@media (max-width: 480px) {
  .score-big { font-size: 3rem; }
  .signal-arrow { width: 48px; height: 48px; font-size: 1.8rem; }
  #arrow-pad .arrow-btn { width: 56px; height: 56px; font-size: 1.4rem; }
  .card { padding: 1.25rem; }
}