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

:root {
  --bg: #0b1121;
  --bg-card: rgba(17, 25, 40, 0.85);
  --bg-hover: rgba(30, 41, 59, 0.6);
  --accent: #38bdf8;
  --accent-glow: rgba(56, 189, 248, 0.25);
  --accent-secondary: #818cf8;
  --success: #4ade80;
  --success-glow: rgba(74, 222, 128, 0.2);
  --error: #f87171;
  --error-bg: rgba(248, 113, 113, 0.12);
  --text: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-dim: #64748b;
  --border: rgba(148, 163, 184, 0.12);
  --border-hover: rgba(148, 163, 184, 0.25);
  --font-body: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Consolas', 'Courier New', monospace;
  --sidebar-width: 200px;
  --sidebar-collapsed: 56px;
  --topbar-height: 56px;
  --bottombar-height: 52px;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(0,0,0,0.3);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.4);
}

html { scroll-behavior: smooth; font-size: 16px; }

body {
  background: var(--bg);
  min-height: 100vh;
  font-family: var(--font-body);
  color: var(--text);
  overflow-x: hidden;
  line-height: 1.6;
}

.sidebar {
  position: fixed;
  left: 0; top: 0; bottom: 0;
  width: var(--sidebar-width);
  background: rgba(11, 17, 33, 0.98);
  backdrop-filter: blur(24px);
  border-right: 1px solid var(--border);
  z-index: 100;
  display: flex;
  flex-direction: column;
  padding: 16px 12px;
  transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 4px 0 24px rgba(0,0,0,0.25);
}

.sidebar.collapsed {
  width: var(--sidebar-collapsed);
  padding: 16px 8px;
}

.sidebar-toggle {
  position: absolute;
  right: -12px;
  top: 50%;
  transform: translateY(-50%);
  width: 24px;
  height: 44px;
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  border: none;
  border-radius: 0 8px 8px 0;
  color: #0b1121;
  cursor: pointer;
  font-size: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 101;
  box-shadow: 2px 0 12px var(--accent-glow);
  transition: all 0.2s ease;
}

.sidebar-toggle:hover {
  width: 28px;
  right: -14px;
}

.sidebar-header {
  text-align: center;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

.sidebar-logo {
  font-size: 1.8rem;
  margin-bottom: 4px;
}

.sidebar-header h2 {
  font-size: 1rem;
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 700;
}

.sidebar-header p {
  font-size: 0.7rem;
  color: var(--text-dim);
  margin-top: 2px;
}

.sidebar.collapsed .sidebar-header h2,
.sidebar.collapsed .sidebar-header p,
.sidebar.collapsed .stat-label,
.sidebar.collapsed .progress-header span:first-child {
  display: none;
}

.sidebar-stats {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.stat-card {
  text-align: center;
  padding: 12px 6px;
  background: var(--bg-hover);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  transition: all 0.2s ease;
}

.stat-card:hover {
  border-color: var(--border-hover);
  background: rgba(30, 41, 59, 0.8);
}

.stat-value {
  font-size: 1.4rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--accent);
  line-height: 1.2;
}

.sidebar.collapsed .stat-value {
  font-size: 0.9rem;
}

.stat-label {
  font-size: 0.65rem;
  color: var(--text-dim);
  margin-top: 4px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.timer-card.warning .stat-value {
  color: var(--error);
  animation: pulse 1s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.sidebar-progress {
  margin-top: auto;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

.progress-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
  font-size: 0.75rem;
  color: var(--text-dim);
}

.progress-track {
  width: 100%;
  height: 6px;
  background: rgba(148, 163, 184, 0.08);
  border-radius: 3px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-secondary));
  border-radius: 3px;
  transition: width 0.3s ease;
  width: 0%;
  box-shadow: 0 0 8px var(--accent-glow);
}

.main {
  margin-left: var(--sidebar-width);
  min-height: 100vh;
  transition: margin-left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  padding-bottom: var(--bottombar-height);
}

.main.sidebar-collapsed {
  margin-left: var(--sidebar-collapsed);
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 90;
  background: rgba(11, 17, 33, 0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 10px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  height: var(--topbar-height);
  flex-wrap: wrap;
}

.topbar-left, .topbar-right {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.mode-group, .setting-group {
  display: flex;
  align-items: center;
  gap: 6px;
}

.mode-group label, .setting-group label {
  font-size: 0.7rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  white-space: nowrap;
}

.btn {
  padding: 7px 14px;
  border: 1px solid var(--border);
  background: var(--bg-hover);
  color: var(--text);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.8rem;
  transition: all 0.2s ease;
  font-family: inherit;
  white-space: nowrap;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.btn:hover {
  border-color: var(--accent);
  background: rgba(56, 189, 248, 0.1);
  transform: translateY(-1px);
}

.btn.active {
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  color: #0b1121;
  border-color: transparent;
  font-weight: 600;
  box-shadow: 0 4px 16px var(--accent-glow);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  color: #0b1121;
  border: none;
  font-weight: 600;
  padding: 8px 18px;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px var(--accent-glow);
}

.btn-sm { padding: 5px 10px; font-size: 0.75rem; }

.btn-home {
  background: rgba(74, 222, 128, 0.1);
  color: var(--success);
  border-color: rgba(74, 222, 128, 0.2);
}

.btn-home:hover {
  background: rgba(74, 222, 128, 0.2);
  border-color: var(--success);
  box-shadow: 0 4px 16px var(--success-glow);
}

.btn-doc {
  background: rgba(129, 140, 248, 0.1);
  color: var(--accent-secondary);
  border-color: rgba(129, 140, 248, 0.2);
}

.btn-doc:hover {
  background: rgba(129, 140, 248, 0.2);
  border-color: var(--accent-secondary);
}

input[type="number"] {
  width: 60px;
  padding: 5px 8px;
  background: rgba(11, 17, 33, 0.6);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  outline: none;
  text-align: center;
}

input[type="number"]:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-glow);
}

.unit {
  font-size: 0.75rem;
  color: var(--text-dim);
}

.file-label input { display: none; }

.content {
  padding: 16px 20px;
  max-width: 100%;
}

.doc-info {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
  padding: 10px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  backdrop-filter: blur(12px);
}

.doc-name {
  font-weight: 600;
  color: var(--accent);
  font-size: 0.95rem;
}

.doc-meta {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-left: auto;
}

.action-bar {
  display: flex;
  gap: 10px;
  margin-bottom: 16px;
  flex-wrap: wrap;
  align-items: center;
}

.typing-area {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  min-height: calc(100vh - var(--topbar-height) - 200px);
}

.text-display {
  padding: 16px 20px;
  font-family: var(--font-body);
  font-size: clamp(1.1rem, 1.8vw, 1.4rem);
  line-height: 2;
  color: var(--text-dim);
  word-break: break-all;
  user-select: none;
  letter-spacing: 0.5px;
  white-space: pre-wrap;
  min-height: 120px;
  max-height: 50vh;
  overflow-y: auto;
  border-bottom: 1px solid var(--border);
}

.text-display .char {
  display: inline-block;
  transition: all 0.06s ease;
  border-radius: 3px;
  padding: 0 1px;
  min-width: 1ch;
}

.text-display .char.correct {
  color: var(--success);
  text-shadow: 0 0 6px var(--success-glow);
}

.text-display .char.incorrect {
  color: var(--error);
  background: var(--error-bg);
  text-decoration: underline wavy var(--error);
  text-underline-offset: 4px;
}

.text-display .char.current {
  background: var(--accent);
  color: #0b1121;
  padding: 0 4px;
  border-radius: 4px;
  font-weight: 700;
  box-shadow: 0 0 12px var(--accent-glow);
  animation: cursorBlink 1s infinite;
}

@keyframes cursorBlink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

.input-wrapper {
  flex: 1;
  min-height: 120px;
}

.typing-input {
  width: 100%;
  height: 100%;
  min-height: 120px;
  padding: 16px 20px;
  background: rgba(11, 17, 33, 0.4);
  border: none;
  color: var(--text);
  font-family: var(--font-body);
  font-size: clamp(1.1rem, 1.8vw, 1.4rem);
  line-height: 2;
  outline: none;
  caret-color: var(--accent);
  letter-spacing: 0.5px;
  resize: none;
  white-space: pre-wrap;
  word-break: break-all;
}

.typing-input::placeholder {
  color: var(--text-dim);
  font-size: 0.9rem;
}

.typing-input:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.typing-input:focus {
  background: rgba(11, 17, 33, 0.6);
}

.history-panel {
  margin-top: 20px;
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
}

.history-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.history-header h3 {
  font-size: 1rem;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 6px;
}

.history-list {
  max-height: 300px;
  overflow-y: auto;
}

.history-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  font-size: 0.85rem;
  transition: background 0.2s;
}

.history-item:hover {
  background: var(--bg-hover);
  border-radius: var(--radius-sm);
}

.history-item:last-child { border-bottom: none; }

.history-time {
  color: var(--text-dim);
  font-size: 0.75rem;
  min-width: 130px;
  font-family: var(--font-mono);
}

.history-mode {
  color: var(--accent-secondary);
  font-size: 0.75rem;
  min-width: 50px;
}

.history-wpm {
  color: var(--accent);
  font-weight: 700;
  font-family: var(--font-mono);
  min-width: 70px;
}

.history-acc {
  color: var(--text-secondary);
  min-width: 60px;
}

.history-badge {
  padding: 2px 8px;
  border-radius: 10px;
  font-size: 0.7rem;
  font-weight: 600;
  margin-left: auto;
}

.badge-high { background: rgba(74, 222, 128, 0.15); color: var(--success); }
.badge-mid { background: rgba(250, 204, 21, 0.15); color: #facc15; }
.badge-low { background: rgba(248, 113, 113, 0.15); color: var(--error); }

.bottom-bar {
  position: fixed;
  bottom: 0;
  left: var(--sidebar-width);
  right: 0;
  background: rgba(11, 17, 33, 0.95);
  backdrop-filter: blur(20px);
  border-top: 1px solid var(--border);
  padding: 10px 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  z-index: 95;
  transition: left 0.3s;
}

.main.sidebar-collapsed ~ .bottom-bar {
  left: var(--sidebar-collapsed);
}

.bottom-bar .btn-home {
  padding: 8px 20px;
  font-size: 0.85rem;
}

.back-to-top {
  position: fixed;
  right: 20px;
  bottom: calc(var(--bottombar-height) + 16px);
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  border: none;
  border-radius: 50%;
  color: #0b1121;
  font-size: 1.2rem;
  cursor: pointer;
  box-shadow: 0 4px 20px var(--accent-glow);
  opacity: 0;
  transform: translateY(16px) scale(0.9);
  transition: all 0.3s ease;
  z-index: 99;
  display: flex;
  align-items: center;
  justify-content: center;
}

.back-to-top.show {
  opacity: 1;
  transform: translateY(0) scale(1);
}

.back-to-top:hover {
  transform: translateY(-3px) scale(1.05);
  box-shadow: 0 8px 32px var(--accent-glow);
}

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(11, 17, 33, 0.92);
  backdrop-filter: blur(8px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 200;
  padding: 20px;
}

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

.modal-content {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 32px;
  text-align: center;
  max-width: 420px;
  width: 100%;
  animation: modalIn 0.3s ease-out;
  box-shadow: var(--shadow-lg);
}

.modal-wide { max-width: 560px; }

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

.modal-icon {
  font-size: 3rem;
  margin-bottom: 8px;
}

.modal-content h2 {
  margin-bottom: 4px;
  font-size: 1.3rem;
}

.modal-sub {
  color: var(--text-dim);
  font-size: 0.85rem;
  margin-bottom: 20px;
}

.final-wpm {
  font-size: 3.5rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--accent);
  line-height: 1;
  text-shadow: 0 0 24px var(--accent-glow);
}

.final-unit {
  color: var(--text-dim);
  font-size: 0.85rem;
  margin-top: 4px;
  margin-bottom: 20px;
}

.modal-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin: 20px 0;
}

.modal-stat {
  padding: 14px;
  background: rgba(11, 17, 33, 0.5);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.modal-value {
  font-size: 1.3rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--text);
}

.modal-label {
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-top: 4px;
}

.modal-actions {
  display: flex;
  gap: 10px;
  margin-top: 20px;
}

.modal-actions .btn {
  flex: 1;
  justify-content: center;
  padding: 10px;
}

.doc-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
  justify-content: center;
}

.doc-list {
  max-height: 320px;
  overflow-y: auto;
  text-align: left;
  margin-bottom: 16px;
}

.doc-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  transition: background 0.2s;
  cursor: pointer;
}

.doc-item:hover {
  background: var(--bg-hover);
  border-radius: var(--radius-sm);
}

.doc-item.active {
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid var(--accent);
  border-radius: var(--radius-sm);
}

.doc-item-name {
  flex: 1;
  font-size: 0.9rem;
  color: var(--text);
}

.doc-item-meta {
  font-size: 0.75rem;
  color: var(--text-dim);
  font-family: var(--font-mono);
}

.doc-item-actions {
  display: flex;
  gap: 6px;
}

.doc-item-actions .btn {
  padding: 4px 8px;
  font-size: 0.7rem;
}

.doc-empty {
  text-align: center;
  color: var(--text-dim);
  padding: 40px;
  font-size: 0.9rem;
}

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-dim); }

@media (max-width: 768px) {
  :root { --sidebar-width: 0px; }
  .sidebar {
    transform: translateX(-100%);
    width: 200px;
  }
  .sidebar.show-mobile { transform: translateX(0); }
  .sidebar-toggle {
    right: -28px;
    transform: none;
    top: 16px;
  }
  .main { margin-left: 0; }
  .topbar {
    padding: 8px 12px;
    height: auto;
  }
  .content { padding: 12px; }
  .text-display, .typing-input {
    font-size: 1.05rem;
    padding: 12px 14px;
  }
  .typing-area {
    min-height: calc(100vh - 180px);
  }
  .modal-stats { grid-template-columns: 1fr 1fr; }
  .bottom-bar {
    left: 0;
    padding: 8px 12px;
    gap: 8px;
  }
  .bottom-bar .btn-home span { display: none; }
  .back-to-top {
    right: 12px;
    bottom: calc(var(--bottombar-height) + 12px);
  }
}

@media (max-width: 480px) {
  .mode-group label, .setting-group label { display: none; }
  .btn {
    padding: 6px 10px;
    font-size: 0.75rem;
  }
  .history-item {
    flex-wrap: wrap;
    gap: 4px;
  }
  .history-time {
    min-width: auto;
    width: 100%;
  }
}