@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');
@import url('https://fonts.cdnfonts.com/css/magic-yellow');

:root {
  --bg: #F8F3EA;
  --bg-card: rgba(255, 255, 255, 0.7);
  --bg-card-solid: rgba(255, 255, 255, 0.85);
  --text-primary: #5C4A3A;
  --text-secondary: #8B7355;
  --text-muted: #B8A38A;
  --text-soft: #C4B8A8;
  --border: rgba(255, 255, 255, 0.9);
  --border-light: rgba(196, 168, 130, 0.3);
  --border-key: rgba(196, 168, 130, 0.15);
  --key-bg: rgba(255, 255, 255, 0.75);
  --key-shadow: rgba(92, 74, 58, 0.05);
  --accent: #C4A882;
  --accent-dark: #B89A72;
  --btn-primary: #5C4A3A;
  --btn-primary-text: #F8F3EA;
  --btn-secondary: rgba(255, 255, 255, 0.6);
  --correct: #1B5E20;
  --correct-bg: rgba(27, 94, 32, 0.12);
  --incorrect: #B71C1C;
  --incorrect-bg: rgba(183, 28, 28, 0.15);
  --current-bg: rgba(196, 168, 130, 0.25);
  --current-text: #5C4A3A;
  --glow-spread: rgba(92, 74, 58, 0.06);
  --overlay-bg: rgba(248, 243, 234, 0.7);
  --voice-overlay: rgba(248, 243, 234, 0.9);
}

[data-theme="dark"] {
  --bg: #0a0a12;
  --bg-card: rgba(18, 18, 30, 0.75);
  --bg-card-solid: rgba(18, 18, 30, 0.9);
  --text-primary: #e0e0f0;
  --text-secondary: #9090b8;
  --text-muted: #606090;
  --text-soft: #505080;
  --border: rgba(100, 100, 200, 0.15);
  --border-light: rgba(100, 100, 200, 0.2);
  --border-key: rgba(100, 100, 200, 0.1);
  --key-bg: rgba(18, 18, 35, 0.8);
  --key-shadow: rgba(0, 0, 0, 0.3);
  --accent: #7c5cfc;
  --accent-dark: #6a4ae8;
  --btn-primary: #7c5cfc;
  --btn-primary-text: #fff;
  --btn-secondary: rgba(30, 30, 60, 0.6);
  --correct: #4ade80;
  --correct-bg: rgba(74, 222, 128, 0.15);
  --incorrect: #ff5555;
  --incorrect-bg: rgba(255, 85, 85, 0.15);
  --current-bg: rgba(124, 92, 252, 0.25);
  --current-text: #c8b8ff;
  --glow-spread: rgba(124, 92, 252, 0.08);
  --overlay-bg: rgba(0, 0, 0, 0.7);
  --voice-overlay: rgba(10, 10, 20, 0.9);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  overflow-x: hidden;
  transition: background 0.4s ease, color 0.4s ease;
}

body::before {
  content: '';
  position: fixed;
  top: -30%;
  left: -20%;
  width: 70%;
  height: 70%;
  background: radial-gradient(ellipse, rgba(196, 168, 130, 0.25), transparent 70%);
  pointer-events: none;
  z-index: 0;
  transition: opacity 0.4s ease;
}

[data-theme="dark"] body::before,
[data-theme="dark"] body::after {
  background: radial-gradient(ellipse, rgba(124, 92, 252, 0.12), transparent 70%);
}

body::after {
  content: '';
  position: fixed;
  bottom: -20%;
  right: -15%;
  width: 60%;
  height: 60%;
  background: radial-gradient(ellipse, rgba(212, 184, 150, 0.2), transparent 70%);
  pointer-events: none;
  z-index: 0;
  transition: opacity 0.4s ease;
}

.container {
  width: 100%;
  max-width: 900px;
  padding: 24px;
  position: relative;
  z-index: 1;
}

header {
  text-align: center;
  margin-bottom: 28px;
}

.header-top {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 20px;
  margin-bottom: 24px;
  position: relative;
}

header h1 {
  font-family: 'Magic Yellow', 'Inter', sans-serif;
  font-size: 30px;
  font-weight: 400;
  color: var(--text-primary);
  letter-spacing: 0.5px;
}

.theme-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
}

.theme-label {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.theme-toggle input {
  display: none;
}

.toggle-track {
  width: 44px;
  height: 24px;
  background: var(--text-muted);
  border-radius: 12px;
  position: relative;
  transition: background 0.3s ease;
}

.toggle-thumb {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 20px;
  height: 20px;
  background: #fff;
  border-radius: 50%;
  transition: transform 0.3s ease;
  box-shadow: 0 1px 4px rgba(0,0,0,0.15);
}

.theme-toggle input:checked + .toggle-track {
  background: linear-gradient(135deg, #7c5cfc, #ff5c9e, #5ce1ff);
  background-size: 200% 200%;
  animation: rgbGlow 2s ease infinite;
}

@keyframes rgbGlow {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

.theme-toggle input:checked + .toggle-track .toggle-thumb {
  transform: translateX(20px);
}

.stats {
  display: flex;
  justify-content: center;
  gap: 40px;
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: 24px;
  padding: 16px 32px;
  box-shadow: 0 2px 20px var(--glow-spread);
  border: 1px solid var(--border);
  transition: background 0.4s ease, border 0.4s ease, box-shadow 0.4s ease;
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.stat span {
  font-size: 26px;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.5px;
}

.stat small {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1.2px;
  font-weight: 500;
}

.mode-selector {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-bottom: 20px;
  background: var(--bg-card);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-radius: 16px;
  padding: 4px;
  width: fit-content;
  margin-left: auto;
  margin-right: auto;
  border: 1px solid var(--border);
  transition: background 0.4s ease, border 0.4s ease;
}

.mode-btn {
  padding: 8px 20px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  border-radius: 12px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 500;
  transition: all 0.25s ease;
  font-family: 'Inter', sans-serif;
}

.mode-btn.active {
  background: var(--bg-card-solid);
  color: var(--text-primary);
  box-shadow: 0 2px 8px var(--glow-spread);
}

.mode-btn:hover:not(.active) {
  color: var(--text-secondary);
}

.text-display {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-radius: 24px;
  padding: 28px 32px;
  margin-bottom: 16px;
  border: 1px solid var(--border);
  box-shadow: 0 4px 30px var(--glow-spread);
  min-height: 120px;
  max-height: 260px;
  overflow-y: auto;
  position: relative;
  transition: background 0.4s ease, border 0.4s ease, box-shadow 0.4s ease;
}

.text-display::-webkit-scrollbar { width: 4px; }
.text-display::-webkit-scrollbar-track { background: transparent; }
.text-display::-webkit-scrollbar-thumb { background: var(--text-muted); border-radius: 4px; }

#paragraph {
  font-family: 'JetBrains Mono', monospace;
  font-size: 18px;
  line-height: 1.9;
  color: var(--text-muted);
  letter-spacing: 0.2px;
  word-wrap: break-word;
  word-break: break-word;
  white-space: pre-wrap;
  transition: color 0.4s ease;
}

#paragraph .correct {
  color: var(--correct);
  background: var(--correct-bg);
  border-radius: 3px;
}

#paragraph .incorrect {
  color: var(--incorrect);
  background: var(--incorrect-bg);
  border-radius: 3px;
}

#paragraph .current {
  background: var(--current-bg);
  border-radius: 3px;
  animation: blink 0.8s ease-in-out infinite;
  color: var(--current-text);
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

.text-input-area { margin-bottom: 16px; }

#userInput {
  width: 100%;
  height: 56px;
  padding: 16px 20px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 16px;
  background: var(--bg-card);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1.5px solid var(--border-light);
  border-radius: 20px;
  color: var(--text-primary);
  resize: none;
  outline: none;
  transition: all 0.25s ease, background 0.4s ease, border 0.4s ease, color 0.4s ease;
  box-shadow: 0 2px 12px var(--glow-spread);
}

#userInput:focus {
  border-color: var(--accent);
  background: var(--bg-card-solid);
  box-shadow: 0 4px 20px var(--glow-spread);
}

#userInput::placeholder {
  color: var(--text-soft);
  font-family: 'Inter', sans-serif;
  font-size: 14px;
}

.controls {
  display: flex;
  gap: 10px;
  justify-content: center;
  margin-bottom: 24px;
}

.controls button {
  padding: 10px 28px;
  border: none;
  border-radius: 16px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.25s ease;
  font-family: 'Inter', sans-serif;
  letter-spacing: -0.2px;
}

#generateBtn {
  background: var(--btn-primary);
  color: var(--btn-primary-text);
  box-shadow: 0 2px 12px var(--glow-spread);
  transition: background 0.3s ease, color 0.3s ease, transform 0.25s ease, box-shadow 0.3s ease;
}

#resetBtn, #replayBtn {
  background: var(--btn-secondary);
  color: var(--text-secondary);
  border: 1px solid var(--border-light);
  transition: background 0.3s ease, color 0.3s ease, transform 0.25s ease, border 0.3s ease;
}

#generateBtn:hover { opacity: 0.9; transform: translateY(-1px); }
#resetBtn:hover, #replayBtn:hover { background: var(--bg-card-solid); transform: translateY(-1px); }

#replayBtn { display: none; }

.voice-overlay {
  display: none;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  flex-direction: column;
  align-items: center;
  gap: 10px;
  background: var(--voice-overlay);
  backdrop-filter: blur(8px);
  padding: 16px 28px;
  border-radius: 24px;
  z-index: 2;
  transition: background 0.4s ease;
}

.text-display.voice-mode .voice-overlay { display: flex; }

.voice-label {
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.3px;
}

.voice-speak-btn {
  padding: 8px 24px;
  border: none;
  background: var(--btn-primary);
  color: var(--btn-primary-text);
  border-radius: 14px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  font-family: 'Inter', sans-serif;
  transition: all 0.2s ease;
  box-shadow: 0 2px 8px var(--glow-spread);
}

.voice-speak-btn:hover { opacity: 0.9; transform: translateY(-1px); }

.keyboard {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: 24px;
  padding: 16px;
  border: 1px solid var(--border);
  box-shadow: 0 4px 30px var(--glow-spread);
  user-select: none;
  transition: background 0.4s ease, border 0.4s ease, box-shadow 0.4s ease;
}

.keyboard-row {
  display: flex;
  justify-content: center;
  gap: 5px;
  margin-bottom: 5px;
}
.keyboard-row:last-child { margin-bottom: 0; }

.key {
  padding: 11px 0;
  width: 50px;
  text-align: center;
  background: var(--key-bg);
  border-radius: 12px;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  text-transform: lowercase;
  transition: all 0.08s ease, background 0.4s ease, color 0.4s ease;
  border: 1px solid var(--border-key);
  box-shadow: 0 1px 3px var(--key-shadow), inset 0 1px 0 rgba(255, 255, 255, 0.8);
  font-family: 'Inter', sans-serif;
  cursor: default;
}

[data-theme="dark"] .key {
  box-shadow: 0 1px 3px var(--key-shadow), inset 0 1px 0 rgba(255, 255, 255, 0.03);
}

.key-wide { width: 76px; }
.key-space { width: 360px; }

.key.active {
  background: var(--accent);
  color: #fff;
  transform: scale(0.93);
  border-color: var(--accent-dark);
  box-shadow: 0 1px 6px var(--glow-spread), inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

[data-theme="dark"] .key.active {
  background: linear-gradient(135deg, #7c5cfc, #ff5c9e);
  border-color: transparent;
  box-shadow: 0 0 16px rgba(124, 92, 252, 0.3), 0 0 32px rgba(255, 92, 158, 0.15);
}

.key.shift-active {
  background: var(--correct);
  color: #fff;
  border-color: transparent;
}

[data-theme="dark"] .key.shift-active {
  background: linear-gradient(135deg, #4ade80, #22d3ee);
  box-shadow: 0 0 12px rgba(74, 222, 128, 0.2);
}

.results-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--overlay-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  justify-content: center;
  align-items: center;
  z-index: 100;
  transition: background 0.4s ease;
}

.results-overlay.show { display: flex; }

.results-card {
  background: var(--bg-card-solid);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  border-radius: 28px;
  padding: 44px 48px;
  text-align: center;
  max-width: 480px;
  width: 90%;
  animation: slideUp 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: 0 20px 60px var(--glow-spread);
  transition: background 0.4s ease, border 0.4s ease, box-shadow 0.4s ease;
}

@keyframes slideUp {
  from { transform: translateY(24px) scale(0.97); opacity: 0; }
  to { transform: translateY(0) scale(1); opacity: 1; }
}

.results-card h2 {
  font-size: 28px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 28px;
  letter-spacing: -0.3px;
}

.results-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 32px;
}

.results-grid div span {
  display: block;
  font-size: 34px;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: -0.5px;
}

.results-grid div small {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1.2px;
  font-weight: 500;
}

#closeResults {
  padding: 12px 40px;
  background: var(--btn-primary);
  color: var(--btn-primary-text);
  border: none;
  border-radius: 16px;
  font-size: 15px;
  cursor: pointer;
  font-weight: 500;
  transition: all 0.25s ease;
  font-family: 'Inter', sans-serif;
  box-shadow: 0 2px 12px var(--glow-spread);
}

#closeResults:hover { opacity: 0.9; transform: translateY(-1px); }

.seo-content {
  margin-top: 24px;
  padding: 20px 24px;
  background: var(--bg-card);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-radius: 20px;
  border: 1px solid var(--border);
  box-shadow: 0 2px 16px var(--glow-spread);
  transition: background 0.4s ease, border 0.4s ease;
}

.seo-content h2 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.seo-content p {
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-muted);
}

.seo-content strong {
  color: var(--text-secondary);
  font-weight: 600;
}

@media (max-width: 768px) {
  .container { padding: 16px; }
  .header-top { flex-direction: column; gap: 12px; }
  .theme-toggle { position: static; transform: none; }
  .stats { gap: 20px; padding: 14px 20px; flex-wrap: wrap; }
  .stat span { font-size: 22px; }
  .key { width: 38px; font-size: 10px; padding: 9px 0; }
  .key-wide { width: 58px; }
  .key-space { width: 240px; }
  #paragraph { font-size: 15px; }
  .text-display { padding: 20px; }
  .results-card { padding: 32px 24px; }
  .mode-selector { flex-wrap: wrap; width: 100%; justify-content: center; }
}

@media (max-width: 480px) {
  .key { width: 30px; font-size: 9px; padding: 8px 0; }
  .key-wide { width: 46px; }
  .key-space { width: 180px; }
  .keyboard { padding: 10px; }
  .keyboard-row { gap: 3px; margin-bottom: 3px; }
}