:root {
  --bg: #0b1020;
  --bg-soft: #121933;
  --card: rgba(17, 24, 49, 0.75);
  --text: #e9eeff;
  --muted: #9aa6d1;
  --accent: #6d7cff;
  --accent-2: #40e0d0;
  --border: rgba(255, 255, 255, 0.12);
  --shadow: 0 12px 30px rgba(0, 0, 0, 0.35);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Inter", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 20% 20%, #1a2a66 0%, transparent 35%),
    radial-gradient(circle at 80% 0%, #1f6b85 0%, transparent 30%),
    linear-gradient(145deg, #070b17 0%, var(--bg) 45%, var(--bg-soft) 100%);
}

.app {
  width: min(1000px, 92%);
  margin: 32px auto;
  display: grid;
  gap: 18px;
}

.app-header {
  text-align: center;
}

.app-header h1 {
  margin: 0;
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 700;
  letter-spacing: 0.4px;
}

.app-header p {
  margin-top: 8px;
  color: var(--muted);
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(8px);
}

.typing-panel {
  padding: 20px;
}

.section-title {
  margin: 0 0 12px;
  font-size: 1.05rem;
  font-weight: 600;
}

.difficulty-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.difficulty-controls label {
  color: var(--muted);
  font-size: 0.9rem;
}

.mode-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.mode-controls label {
  color: var(--muted);
  font-size: 0.9rem;
}

.difficulty-select {
  background: rgba(4, 8, 20, 0.8);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 10px;
  font: inherit;
}

.symbols-toggle-btn {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 12px;
  background: rgba(4, 8, 20, 0.8);
  color: #d0d8f5;
  font: inherit;
  cursor: pointer;
}

.symbols-toggle-btn.active {
  background: rgba(64, 224, 208, 0.2);
  border-color: rgba(64, 224, 208, 0.45);
  color: #9ef8ee;
}

.mode-panel {
  margin-bottom: 12px;
}

.mode-extra {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
  color: #d0d8f5;
}

.mode-extra.hidden {
  display: none;
}

.lives-hearts {
  display: inline-flex;
  gap: 6px;
}

.life-heart {
  font-size: 1.1rem;
  line-height: 1;
}

.life-heart.lost {
  opacity: 0.25;
  filter: grayscale(0.9);
  animation: heart-blink 0.7s steps(2, end) infinite;
}

@keyframes heart-blink {
  0%,
  100% {
    opacity: 0.25;
  }
  50% {
    opacity: 0.75;
  }
}

.text-display {
  margin: 0 0 14px;
  padding: 14px;
  line-height: 1.7;
  border-radius: 12px;
  background: rgba(0, 0, 0, 0.22);
  border: 1px solid var(--border);
  color: #d9e0ff;
  word-wrap: break-word;
}

.text-display.memory-hidden {
  color: transparent;
  text-shadow: 0 0 10px rgba(210, 220, 255, 0.75);
  user-select: none;
}

.text-display .char.memory-obscured {
  color: transparent !important;
  text-shadow: 0 0 8px rgba(210, 220, 255, 0.75) !important;
}

.char.correct {
  color: #67f7a1;
}

.char.incorrect {
  color: #ff6f91;
  background: rgba(255, 111, 145, 0.16);
  border-radius: 4px;
}

.char.current {
  background: rgba(109, 124, 255, 0.25);
  border-radius: 4px;
}

.typing-input {
  width: 100%;
  resize: vertical;
  min-height: 120px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(4, 8, 20, 0.8);
  color: var(--text);
  font: inherit;
  line-height: 1.6;
  padding: 14px;
  outline: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.typing-input:focus {
  border-color: var(--accent-2);
  box-shadow: 0 0 0 3px rgba(64, 224, 208, 0.18);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
}

.stat-card {
  padding: 14px;
}

.stat-card h3 {
  margin: 0;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--muted);
}

.stat-card p {
  margin: 8px 0 0;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text);
}

.actions {
  display: flex;
  justify-content: flex-end;
}

.restart-btn {
  border: 0;
  border-radius: 12px;
  padding: 11px 20px;
  background: linear-gradient(120deg, var(--accent) 0%, var(--accent-2) 100%);
  color: #041022;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  box-shadow: 0 8px 20px rgba(64, 224, 208, 0.24);
}

.restart-btn:hover {
  transform: translateY(-1px);
}

.restart-btn:active {
  transform: translateY(0);
}

.result-section,
.difficult-section,
.coach-section {
  padding: 18px;
}

.result-section p,
.coach-section p {
  margin: 0;
  color: #d0d8f5;
}

.coach-list {
  display: grid;
  gap: 8px;
}

.coach-tip {
  margin: 0;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.18);
  color: #d0d8f5;
}

.result-section.hidden {
  display: none;
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 10px;
}

.result-item {
  background: rgba(0, 0, 0, 0.18);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px;
}

.result-item span {
  display: block;
}

.result-item .label {
  color: var(--muted);
  font-size: 0.82rem;
}

.result-item .value {
  margin-top: 4px;
  font-weight: 700;
}

.heatmap-wrap {
  margin-top: 10px;
  padding: 10px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.16);
}

.heatmap-title {
  margin: 0 0 8px;
  font-size: 0.9rem;
  color: var(--muted);
}

.keyboard-heatmap {
  display: grid;
  gap: 6px;
}

.keyboard-row {
  display: flex;
  gap: 6px;
  justify-content: center;
}

.heat-key {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.82rem;
  font-weight: 700;
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: #eaf0ff;
  position: relative;
  cursor: help;
  transition: background-color 0.42s ease, color 0.35s ease, transform 0.2s ease;
}

.heat-key:hover {
  transform: translateY(-1px);
}

.heat-key::after {
  content: attr(data-tooltip);
  position: absolute;
  left: 50%;
  bottom: calc(100% + 8px);
  transform: translateX(-50%) translateY(4px);
  min-width: 190px;
  max-width: 260px;
  padding: 6px 8px;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  background: rgba(5, 10, 24, 0.95);
  color: #e9eeff;
  font-size: 0.74rem;
  font-weight: 500;
  line-height: 1.35;
  letter-spacing: 0.1px;
  text-align: left;
  white-space: normal;
  box-shadow: 0 10px 22px rgba(0, 0, 0, 0.35);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s ease, transform 0.2s ease;
  z-index: 8;
}

.heat-key:hover::after {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.heat-key-space {
  width: 180px;
}

.difficult-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
  gap: 10px;
}

.difficult-item {
  background: rgba(0, 0, 0, 0.18);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px;
}

.difficult-letter {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 28px;
  height: 28px;
  border-radius: 8px;
  background: rgba(109, 124, 255, 0.2);
  font-weight: 700;
}

.difficult-count {
  margin-top: 6px;
  color: var(--muted);
  font-size: 0.86rem;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}