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

/* ── dark mode (default) ── */
:root {
  --bg: #1a1917;
  --surface: #15130d;
  --surface2: #2e2c29;
  --border: rgba(255,255,255,0.1);
  --border2: rgba(255,255,255,0.18);
  --text: #f0ede8;
  --text2: #9e9b95;
  --text3: #6b6963;
  --green: #5cba7d;
  --green-bg: #0d2e1a;
  --red: #e87070;
  --red-bg: #2e1010;
  --blue: #85b7eb;
  --blue-bg: #0c1f38;
  --amber: #ef9f27;
  --amber-bg: #2e1e05;
  --accent: #ef9f27;
  --purple: #A599E9;
}

/* ── light mode ── */
[data-theme="light"] {
  --bg: #eeece7;
  --surface: #f9f8f5;
  --surface2: #e4e1da;
  --border: rgba(0,0,0,0.2);
  --border2: rgba(0,0,0,0.35);
  --text: #1a1917;
  --text2: #6b6963;
  --text3: #9e9b95;
  --green: #2d7a45;
  --green-bg: #eaf5ee;
  --red: #c0392b;
  --red-bg: #fdecea;
  --blue: #185fa5;
  --blue-bg: #e6f1fb;
  --amber: #ba7517;
  --amber-bg: #faeeda;
  --accent: #d85a30;
  --purple: #7c6fd4;
}

body {
  font-family: 'Georgia', 'Times New Roman', serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 2rem 1rem 4rem;
  transition: background 0.2s, color 0.2s;
}

.container { width: 100%; max-width: 680px; }

/* ── header ── */
.header { text-align: center; margin-bottom: 1.75rem; position: relative; }
.header h1 {
  font-size: 28px;
  font-weight: normal;
  letter-spacing: -0.02em;
  margin-bottom: 6px;
  color: var(--text);
}
.header p { font-size: 14px; color: var(--text2); font-family: 'Helvetica Neue', sans-serif; }
.header .dot { color: var(--accent); }

.header-controls {
  position: absolute;
  top: 0; right: 0;
  display: flex;
  gap: 6px;
  align-items: center;
}
.ctrl-btn {
  cursor: pointer;
  border: 0.5px solid var(--border2);
  border-radius: 8px;
  background: transparent;
  color: var(--text2);
  font-size: 15px;
  width: 34px;
  height: 34px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.12s, color 0.12s;
}
.ctrl-btn:hover { background: var(--surface2); color: var(--text); }
.ctrl-btn.active { color: var(--amber); border-color: var(--amber); }

[data-theme="light"] .stat {
  background: #ffffff;
  border: 1px solid rgba(0,0,0,0.14);
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
}
.level-row {
  display: flex;
  gap: 8px;
  justify-content: center;
  margin-bottom: 1.5rem;
}
.level-btn {
  cursor: pointer;
  border: 0.5px solid var(--border2);
  border-radius: 20px;
  background: transparent;
  color: var(--text2);
  font-size: 13px;
  font-family: 'Helvetica Neue', sans-serif;
  padding: 6px 18px;
  transition: background 0.12s, color 0.12s, border-color 0.12s;
}
.level-btn:hover { background: var(--surface2); color: var(--text); }
.level-btn.active-easy   { background: var(--blue-bg);  color: var(--blue);  border-color: var(--blue);  }
.level-btn.active-medium { background: var(--amber-bg); color: var(--amber); border-color: var(--amber); }
.level-btn.active-hard   { background: var(--red-bg);   color: var(--red);   border-color: var(--red);   }

/* ── stats ── */
.stat-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 1.25rem;
}
.stat {
  background: var(--surface2);
  border-radius: 10px;
  padding: 0.85rem 1rem;
  text-align: center;
}
.stat-label {
  font-size: 11px;
  font-family: 'Helvetica Neue', sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text3);
  margin-bottom: 4px;
}
.stat-value { font-size: 26px; font-weight: normal; color: var(--text); }
.stat-unit  { font-size: 13px; color: var(--text3); margin-left: 2px; }
.stat.paused .stat-value { color: var(--amber); }

.progress-bg {
  height: 3px;
  background: var(--border);
  border-radius: 2px;
  margin-bottom: 1.25rem;
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  background: var(--green);
  border-radius: 2px;
  transition: width 0.1s ease;
}

/* ── fact card ── */
.fact-card {
  background: var(--surface);
  border: 0.5px solid var(--border);
  border-radius: 14px;
  padding: 1.5rem 1.75rem;
  margin-bottom: 1rem;
  position: relative;
  overflow: hidden;
}
.pause-cover {
  display: none;
  position: absolute;
  inset: 0;
  background: var(--surface);
  align-items: center;
  justify-content: center;
  font-family: 'Helvetica Neue', sans-serif;
  font-size: 15px;
  color: var(--text3);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  z-index: 2;
}
.pause-cover.visible { display: flex; }

.fact-category {
  font-size: 11px;
  font-family: 'Helvetica Neue', sans-serif;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--purple);
  margin-bottom: 10px;
}
.fact-text {
  font-size: 17px;
  line-height: 1.7;
  color: var(--text);
  word-break: normal;
  overflow-wrap: break-word;
  white-space: normal;
}
.fact-text span { display: inline; word-break: normal; white-space: normal; }
.fact-text .correct { color: var(--green); }
.fact-text .wrong   { color: var(--red); background: var(--red-bg); border-radius: 2px; }
.fact-text .pending { color: var(--text3); }
.fact-text .active  {
  color: var(--text3);
  border-bottom: 2px solid var(--text);
  animation: blink-cursor 1s step-end infinite;
}
@keyframes blink-cursor { 50% { border-color: transparent; } }

.diff-badge {
  position: absolute;
  top: 12px; right: 14px;
  font-size: 10px;
  font-family: 'Helvetica Neue', sans-serif;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  border-radius: 20px;
  padding: 2px 9px;
  font-weight: 500;
}
.diff-badge.easy   { background: var(--blue-bg);  color: var(--blue);  }
.diff-badge.medium { background: var(--amber-bg); color: var(--amber); }
.diff-badge.hard   { background: var(--red-bg);   color: var(--red);   }

/* ── input ── */
textarea {
  width: 100%;
  padding: 12px 16px;
  font-size: 15px;
  font-family: 'Courier New', monospace;
  border: 0.5px solid var(--border2);
  border-radius: 10px;
  background: var(--surface);
  color: var(--text);
  resize: none;
  height: 54px;
  outline: none;
  line-height: 1.5;
  transition: border-color 0.15s, box-shadow 0.15s;
}
textarea:focus    { border-color: var(--text2); box-shadow: 0 0 0 3px rgba(128,128,128,0.1); }
textarea:disabled { background: var(--surface2); color: var(--text3); cursor: not-allowed; }

/* ── buttons ── */
.action-row {
  display: flex;
  gap: 8px;
  margin-top: 0.75rem;
  align-items: center;
  flex-wrap: wrap;
}
button {
  cursor: pointer;
  border: 0.5px solid var(--border2);
  border-radius: 8px;
  background: transparent;
  color: var(--text);
  font-size: 13px;
  font-family: 'Helvetica Neue', sans-serif;
  padding: 8px 18px;
  transition: background 0.12s, transform 0.1s;
}
button:hover   { background: var(--surface2); }
button:active  { transform: scale(0.97); }
button.primary { background: var(--text); color: var(--bg); border-color: var(--text); }
button.primary:hover { opacity: 0.82; }
button.pause-btn { width: 38px; height: 38px; padding: 0; font-size: 12px; text-align: center; flex-shrink: 0; }
button.pause-btn.is-paused { border-color: var(--amber); color: var(--amber); }
button.pause-btn.is-paused:hover { background: var(--amber-bg); }
button:disabled { opacity: 0.35; cursor: not-allowed; }

.hint { font-size: 12px; color: var(--text3); font-family: 'Helvetica Neue', sans-serif; margin-left: auto; }

/* tips button */
button.tips-btn {
  border-color: var(--border2);
  color: var(--text);
  transition: background 0.12s, color 0.15s, border-color 0.15s, box-shadow 0.15s;
}
button.tips-btn:hover {
  background: rgba(165, 153, 233, 0.12);
  color: var(--purple);
  border-color: var(--purple);
  box-shadow: 0 0 8px 2px rgba(165, 153, 233, 0.35);
}

/* ── result ── */
.result-banner {
  border: 0.5px solid var(--border);
  background: var(--green-bg);
  border-left: 3px solid var(--green);
  border-radius: 10px;
  padding: 1rem 1.25rem;
  margin-top: 1rem;
  display: none;
}
.result-banner.show { display: block; }
.result-title { font-size: 15px; color: var(--green); margin-bottom: 4px; }
.result-desc  { font-size: 13px; color: var(--text2); font-family: 'Helvetica Neue', sans-serif; }

/* ── leaderboard ── */
.leaderboard {
  margin-top: 2rem;
  background: var(--surface);
  border: 0.5px solid var(--border);
  border-radius: 14px;
  padding: 1.25rem 1.5rem;
}
.lb-title {
  font-size: 11px;
  font-family: 'Helvetica Neue', sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text3);
  margin-bottom: 12px;
}
.lb-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 0;
  border-bottom: 0.5px solid var(--border);
  font-family: 'Helvetica Neue', sans-serif;
  font-size: 14px;
}
.lb-row:last-child { border-bottom: none; }
.lb-rank  { width: 20px; color: var(--text3); font-size: 12px; }
.lb-wpm   { font-size: 16px; color: var(--text); min-width: 52px; }
.lb-acc   { color: var(--text3); font-size: 12px; min-width: 44px; }
.lb-diff  { font-size: 11px; border-radius: 20px; padding: 1px 8px; min-width: 52px; text-align: center; }
.lb-diff.easy   { background: var(--blue-bg);  color: var(--blue);  }
.lb-diff.medium { background: var(--amber-bg); color: var(--amber); }
.lb-diff.hard   { background: var(--red-bg);   color: var(--red);   }
.lb-fact  { color: var(--text2); font-size: 12px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; flex: 1; }
.lb-empty { color: var(--text3); font-size: 13px; font-family: 'Helvetica Neue', sans-serif; text-align: center; padding: 1rem 0; }

/* ── tips modal ── */
.modal-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  z-index: 100;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}
.modal-backdrop.open { display: flex; }
.modal {
  background: var(--surface);
  border: 0.5px solid var(--border2);
  border-radius: 16px;
  width: 100%;
  max-width: 520px;
  max-height: 80vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.1rem 1.4rem;
  border-bottom: 0.5px solid var(--border);
  flex-shrink: 0;
}
.modal-title {
  font-family: 'Helvetica Neue', sans-serif;
  font-size: 15px;
  font-weight: 500;
  color: var(--text);
}
.modal-close {
  background: transparent;
  border: none;
  color: var(--text3);
  font-size: 16px;
  cursor: pointer;
  padding: 4px 6px;
  line-height: 1;
  border-radius: 6px;
}
.modal-close:hover { background: var(--surface2); color: var(--text); }
.modal-body {
  overflow-y: auto;
  padding: 1.25rem 1.4rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}
.tip-section-label {
  font-family: 'Helvetica Neue', sans-serif;
  font-size: 11px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--purple);
  margin-bottom: 8px;
}
.tip-item {
  display: flex;
  gap: 10px;
  font-family: 'Helvetica Neue', sans-serif;
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--text2);
  padding: 4px 0;
}
.tip-icon {
  color: var(--purple);
  font-size: 9px;
  margin-top: 5px;
  flex-shrink: 0;
}

/* ── focus mode overlay ── */
.focus-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--bg);
  z-index: 200;
  align-items: center;
  justify-content: center;
  padding: 2rem 1rem;
  transition: background 0.2s;
}
.focus-overlay.open { display: flex; }

.focus-box {
  width: 100%;
  max-width: 640px;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.focus-header {
  display: flex;
  align-items: center;
  gap: 12px;
}
.focus-cat {
  font-size: 11px;
  font-family: 'Helvetica Neue', sans-serif;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--purple);
}
.focus-stats {
  display: flex;
  gap: 16px;
  margin-left: auto;
  font-family: 'Helvetica Neue', sans-serif;
  font-size: 13px;
  color: var(--text3);
}
.focus-stats .stat-unit { font-size: 11px; color: var(--text3); margin-left: 2px; }
.focus-exit {
  font-size: 14px;
}

.focus-progress-bg {
  height: 2px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
}
.focus-progress-fill {
  height: 100%;
  background: var(--green);
  border-radius: 2px;
  transition: width 0.1s ease;
  width: 0%;
}

.focus-text {
  font-size: 22px;
  line-height: 1.8;
}

#focus-input {
  font-size: 15px;
  height: auto;
  min-height: 54px;
  overflow-y: hidden;
  background: var(--surface);
}

.focus-actions {
  display: flex;
  gap: 8px;
  align-items: center;
}