:root {
  --bg: #070a0f;
  --panel: rgba(255, 255, 255, 0.035);
  --panel-strong: rgba(255, 255, 255, 0.06);
  --line: rgba(255, 255, 255, 0.09);
  --line-bright: rgba(255, 255, 255, 0.16);
  --text: #e8edf5;
  --muted: #7b8698;
  --accent: #22d3ee;
  --accent-soft: rgba(34, 211, 238, 0.14);
  --accent-glow: rgba(34, 211, 238, 0.45);
  --danger: #f43f5e;
  --danger-soft: rgba(244, 63, 94, 0.14);
  --ok: #34d399;
  --radius: 16px;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, monospace;
}

* { box-sizing: border-box; }

html { background: var(--bg); }

body {
  margin: 0;
  min-height: 100vh;
  padding: 24px 16px calc(32px + env(safe-area-inset-bottom));
  color: var(--text);
  background: var(--bg);
  font-family: system-ui, -apple-system, "Hiragino Sans", "Noto Sans JP", sans-serif;
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -webkit-user-select: none;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  overflow-x: hidden;
}

/* 背景の光と細いグリッド */
.backdrop {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(90% 60% at 50% -10%, rgba(34, 211, 238, 0.16), transparent 65%),
    radial-gradient(70% 50% at 100% 100%, rgba(129, 140, 248, 0.10), transparent 70%),
    linear-gradient(transparent 0 39px, var(--line) 39px 40px) 0 0 / 100% 40px,
    linear-gradient(90deg, transparent 0 39px, var(--line) 39px 40px) 0 0 / 40px 100%;
  opacity: 0.9;
  mask-image: radial-gradient(120% 90% at 50% 0%, #000 30%, transparent 85%);
  -webkit-mask-image: radial-gradient(120% 90% at 50% 0%, #000 30%, transparent 85%);
}

main {
  position: relative;
  z-index: 1;
  max-width: 460px;
  margin: 0 auto;
  display: grid;
  gap: 14px;
}

/* ── ヘッダー ── */
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 0 4px 6px;
}

.brand { display: flex; align-items: center; gap: 12px; }

.mark {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 1.5px solid var(--accent);
  position: relative;
  flex: none;
  box-shadow: 0 0 18px var(--accent-soft), inset 0 0 12px var(--accent-soft);
}
.mark::after {
  content: "";
  position: absolute;
  inset: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 12px var(--accent-glow);
}

.brand-text h1 {
  margin: 0;
  font-size: 1.3rem;
  font-weight: 650;
  letter-spacing: 0.02em;
}
.brand-text p {
  margin: 1px 0 0;
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.22em;
  color: var(--muted);
}

.status {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 6px 12px 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--line-bright);
  background: var(--panel-strong);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--muted);
  white-space: nowrap;
}
.status .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: currentColor;
  flex: none;
}
.status[data-state="connected"] {
  color: var(--ok);
  border-color: rgba(52, 211, 153, 0.4);
  background: rgba(52, 211, 153, 0.1);
}
.status[data-state="connected"] .dot {
  box-shadow: 0 0 0 0 rgba(52, 211, 153, 0.6);
  animation: pulse 2s ease-out infinite;
}
.status[data-state="connecting"] {
  color: #fbbf24;
  border-color: rgba(251, 191, 36, 0.4);
  background: rgba(251, 191, 36, 0.1);
}
.status[data-state="connecting"] .dot { animation: blink 0.9s steps(2, end) infinite; }

@keyframes pulse {
  70% { box-shadow: 0 0 0 8px rgba(52, 211, 153, 0); }
  100% { box-shadow: 0 0 0 0 rgba(52, 211, 153, 0); }
}
@keyframes blink { 50% { opacity: 0.25; } }

/* ── パネル ── */
.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.panel h2 {
  margin: 0 0 12px;
  font-family: var(--mono);
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--muted);
  text-transform: uppercase;
}

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }

.hint {
  margin: 12px 0 0;
  font-size: 0.72rem;
  color: var(--muted);
  text-align: center;
  line-height: 1.6;
}

.notice {
  border-color: rgba(244, 63, 94, 0.35);
  background: var(--danger-soft);
  color: #fda4af;
  font-size: 0.85rem;
}

/* ── ボタン ── */
.btn {
  font: inherit;
  font-weight: 600;
  width: 100%;
  padding: 13px 16px;
  border-radius: 12px;
  border: 1px solid var(--line-bright);
  background: var(--panel-strong);
  color: var(--text);
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s, transform 0.08s, box-shadow 0.15s;
}
.btn:disabled { opacity: 0.3; cursor: not-allowed; }
.btn:not(:disabled):hover { border-color: var(--accent); }
.btn:not(:disabled):active { transform: scale(0.975); }

.btn.primary {
  border-color: transparent;
  color: #04222a;
  background: linear-gradient(180deg, #67e8f9, var(--accent));
  box-shadow: 0 6px 24px -8px var(--accent-glow);
}
.btn.primary:not(:disabled):hover { box-shadow: 0 8px 30px -8px var(--accent-glow); }

.btn.ghost { color: var(--danger); border-color: rgba(244, 63, 94, 0.4); }
.btn.ghost:not(:disabled):hover { background: var(--danger-soft); border-color: var(--danger); }

.connect-panel { display: grid; gap: 0; }

/* オン・オフの2択 */
.switch { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.seg-btn { padding: 12px 8px; font-size: 0.9rem; }
.seg-btn:not(:disabled):active {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
}

/* ── 速度 ── */
.speed { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; }
.speed input { position: absolute; opacity: 0; pointer-events: none; }
.speed label { display: block; cursor: pointer; }
.seg {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  padding: 10px 2px;
  border: 1px solid var(--line-bright);
  border-radius: 12px;
  background: var(--panel-strong);
  transition: background 0.15s, border-color 0.15s, box-shadow 0.15s;
}
.seg b { font-size: 0.74rem; font-weight: 650; }
.seg em {
  font-family: var(--mono);
  font-style: normal;
  font-size: 0.6rem;
  color: var(--muted);
  letter-spacing: 0.03em;
}
.speed label:hover .seg { border-color: var(--line-bright); background: rgba(255, 255, 255, 0.09); }
.speed input:checked + .seg {
  border-color: var(--accent);
  background: var(--accent-soft);
  box-shadow: 0 0 20px -6px var(--accent-glow), inset 0 0 20px -14px var(--accent);
}
.speed input:checked + .seg b { color: var(--accent); }
.speed input:checked + .seg em { color: rgba(34, 211, 238, 0.75); }
.speed input:focus-visible + .seg { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ── 十字キー ── */
.pad-wrap { position: relative; display: grid; place-items: center; padding: 6px 0; }

.pad-ring {
  position: absolute;
  width: 258px;
  height: 258px;
  max-width: 92vw;
  max-height: 92vw;
  border-radius: 50%;
  border: 1px dashed var(--line-bright);
  opacity: 0.55;
}

.dpad {
  position: relative;
  display: grid;
  grid-template-columns: repeat(3, 72px);
  grid-template-rows: repeat(3, 72px);
  gap: 6px;
}
.dpad .up { grid-area: 1 / 2; }
.dpad .left { grid-area: 2 / 1; }
.dpad .stop { grid-area: 2 / 2; }
.dpad .right { grid-area: 2 / 3; }
.dpad .down { grid-area: 3 / 2; }

.pad {
  display: grid;
  place-items: center;
  padding: 0;
  border-radius: 50%;
  border: 1px solid var(--line-bright);
  background: radial-gradient(120% 120% at 50% 0%, rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0.02));
  color: var(--text);
  cursor: pointer;
  touch-action: none;
  transition: background 0.12s, border-color 0.12s, color 0.12s, transform 0.08s, box-shadow 0.12s;
}
.pad svg { width: 30px; height: 30px; fill: currentColor; }
.pad:disabled { opacity: 0.28; cursor: not-allowed; }
.pad:not(:disabled):hover { border-color: rgba(34, 211, 238, 0.5); }

.pad.active,
.pad:not(:disabled):active {
  color: #04222a;
  border-color: var(--accent);
  background: linear-gradient(180deg, #67e8f9, var(--accent));
  box-shadow: 0 0 28px -4px var(--accent-glow);
  transform: scale(0.95);
}

.pad.stop {
  color: var(--danger);
  border-color: rgba(244, 63, 94, 0.45);
  background: radial-gradient(120% 120% at 50% 0%, rgba(244, 63, 94, 0.16), rgba(244, 63, 94, 0.04));
}
.pad.stop svg { width: 26px; height: 26px; }
.pad.stop:not(:disabled):hover { border-color: var(--danger); }
.pad.stop:not(:disabled):active {
  color: #fff;
  background: linear-gradient(180deg, #fb7185, var(--danger));
  box-shadow: 0 0 28px -4px rgba(244, 63, 94, 0.6);
}

/* ── ログ ── */
.log {
  font-family: var(--mono);
  font-size: 0.7rem;
  line-height: 1.75;
  color: var(--muted);
  max-height: 150px;
  overflow-y: auto;
  overscroll-behavior: contain;
  white-space: pre-wrap;
  word-break: break-all;
  -webkit-user-select: text;
  user-select: text;
}
.log div { border-bottom: 1px solid rgba(255, 255, 255, 0.045); padding: 2px 0; }
.log div:first-child { color: var(--accent); }
.log:empty::before { content: "まだ何も送っていません"; opacity: 0.5; }

@media (max-width: 380px) {
  .dpad { grid-template-columns: repeat(3, 64px); grid-template-rows: repeat(3, 64px); }
  .pad-ring { width: 232px; height: 232px; }
  .seg b { font-size: 0.68rem; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}