:root {
  --bg: #0f1115;
  --panel: #181c24;
  --panel-2: #1f2430;
  --text: #e6e9f0;
  --muted: #8a93a6;
  --accent: #6ea8fe;
  --ok: #4ade80;
  --err: #f87171;
  --key: #262c3a;
  --key-border: #333b4d;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", "Hiragino Sans", "Noto Sans JP", sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 24px 16px 48px;
}

header {
  width: 100%;
  max-width: 900px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

h1 {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--accent);
}

.mode-toggle {
  display: flex;
  background: var(--panel);
  border-radius: 10px;
  padding: 4px;
  gap: 4px;
}

.mode-toggle button {
  border: none;
  background: transparent;
  color: var(--muted);
  font-size: 14px;
  padding: 8px 16px;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.mode-toggle button.active {
  background: var(--accent);
  color: #0b1020;
  font-weight: 600;
}

#categories {
  width: 100%;
  max-width: 900px;
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
}

#categories button {
  border: 1px solid var(--key-border);
  background: var(--panel);
  color: var(--muted);
  font-size: 13px;
  padding: 6px 14px;
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.15s;
}

#categories button.active {
  background: var(--panel-2);
  color: var(--text);
  border-color: var(--accent);
}

main {
  width: 100%;
  max-width: 900px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

#drill-card {
  background: var(--panel);
  border-radius: 16px;
  padding: 28px 32px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

#mode-line {
  display: flex;
  align-items: center;
  gap: 12px;
}

#mode-badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 14px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  user-select: none;
  background: rgba(110, 168, 254, 0.18);
  color: var(--accent);
  border: 1px solid var(--accent);
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}

#mode-badge.eisu {
  background: rgba(74, 222, 128, 0.15);
  color: var(--ok);
  border-color: var(--ok);
}

#mode-badge.warn {
  background: rgba(248, 113, 113, 0.18);
  color: var(--err);
  border-color: var(--err);
  animation: pulse 0.8s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.45; }
}

#mode-switch-hint {
  font-size: 12px;
  color: var(--muted);
}

#mode-switch-hint.warn {
  color: var(--err);
  font-weight: 600;
}

.mode-miss {
  color: var(--err);
  font-weight: 600;
  margin-bottom: 4px;
}

#jp-disp {
  font-size: 22px;
  color: var(--text);
  line-height: 1.6;
}

#target {
  font-family: "Consolas", "Cascadia Code", monospace;
  font-size: 24px;
  line-height: 1.8;
  word-break: break-all;
  transition: transform 0.1s;
}

#target.error-flash { animation: shake 0.15s; }

@keyframes shake {
  0% { transform: translateX(0); }
  25% { transform: translateX(-4px); }
  75% { transform: translateX(4px); }
  100% { transform: translateX(0); }
}

#target span { color: var(--muted); }
#target span.done { color: var(--ok); }
#target span.current {
  color: var(--text);
  background: rgba(110, 168, 254, 0.25);
  border-radius: 3px;
  outline: 1px solid var(--accent);
}
#target span.raw {
  text-decoration: underline;
  text-decoration-color: var(--accent);
  text-underline-offset: 5px;
}

#target span.current.err {
  background: rgba(248, 113, 113, 0.3);
  outline-color: var(--err);
}

#type-input {
  width: 100%;
  background: var(--panel-2);
  border: 1px solid var(--key-border);
  border-radius: 10px;
  padding: 12px 16px;
  color: var(--text);
  font-size: 18px;
  font-family: "Segoe UI", "Hiragino Sans", "Noto Sans JP", sans-serif;
  outline: none;
  transition: border-color 0.15s;
}

#type-input:focus { border-color: var(--accent); }
#type-input:disabled { opacity: 0.5; }
#type-input::placeholder { color: var(--muted); font-size: 14px; }

.raw-legend {
  text-decoration: underline;
  text-decoration-color: var(--accent);
  text-underline-offset: 3px;
}

#romaji-line {
  font-family: "Consolas", "Cascadia Code", monospace;
  font-size: 17px;
  letter-spacing: 0.05em;
  word-break: break-all;
}
#romaji-line .done { color: var(--ok); }
#romaji-line .rest { color: var(--muted); }

#hint { font-size: 12px; color: var(--muted); }

/* ---------- 苦手キーパネル ---------- */
#weak-panel {
  background: var(--panel);
  border-radius: 12px;
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  font-size: 13px;
}

.weak-title { color: var(--muted); }
.weak-empty { color: var(--muted); font-size: 12px; }

.weak-chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: var(--panel-2);
  border-radius: 6px;
  padding: 3px 8px;
  font-size: 12px;
  color: var(--text);
}

.weak-chip kbd {
  font-family: "Consolas", monospace;
  background: var(--key);
  border: 1px solid var(--key-border);
  border-radius: 4px;
  padding: 1px 5px;
  color: var(--err);
}

#weak-reset {
  margin-left: auto;
  border: 1px solid var(--key-border);
  background: transparent;
  color: var(--muted);
  font-size: 12px;
  padding: 4px 10px;
  border-radius: 6px;
  cursor: pointer;
}
#weak-reset:hover { color: var(--text); }

/* ---------- 結果オーバーレイ ---------- */
#result-overlay {
  position: fixed;
  inset: 0;
  background: rgba(10, 12, 18, 0.75);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
}

#result-card {
  background: var(--panel-2);
  border: 1px solid var(--key-border);
  border-radius: 16px;
  padding: 32px 40px;
  min-width: 380px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  text-align: center;
}

#result-card h2 { color: var(--accent); font-size: 22px; }

#result-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}

.r-stat {
  background: var(--panel);
  border-radius: 10px;
  padding: 10px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.r-stat span { font-size: 11px; color: var(--muted); }
.r-stat b { font-size: 18px; font-variant-numeric: tabular-nums; }

#result-miss-keys { font-size: 13px; color: var(--muted); line-height: 2; }

.result-buttons { display: flex; gap: 10px; justify-content: center; }

.result-buttons button {
  border: 1px solid var(--key-border);
  background: var(--panel);
  color: var(--text);
  font-size: 14px;
  padding: 10px 20px;
  border-radius: 10px;
  cursor: pointer;
}

.result-buttons button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #0b1020;
  font-weight: 600;
}

.hidden { display: none !important; }