/* ═══ Focus Tracker — Dark Blue, Full Layout ═════════════════════
   Palette: Deep navy + electric blue accents
   ════════════════════════════════════════════════════════════════ */

:root {
  --bg: #0a0e1a;
  --bg-card: #111726;
  --bg-elevated: #161d30;
  --bg-hover: #1c2540;
  --border: #1e2a45;
  --border-subtle: #161e33;
  --text: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-tertiary: #64748b;
  --accent: #3b82f6;
  --accent-bright: #60a5fa;
  --accent-soft: #3b82f620;
  --accent-glow: #3b82f640;
  --focus-color: #3b82f6;
  --break-color: #f59e0b;
  --danger: #ef4444;
  --success: #22c55e;
  --radius: 14px;
  --radius-sm: 10px;
  --transition: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --sidebar-w: 200px;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow: hidden;
  background-image:
    radial-gradient(ellipse 80% 60% at 20% 0%, #0d1525 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 80% 100%, #0a1220 0%, transparent 60%);
}

/* ═══ App Shell ═══ */
#app-shell {
  display: flex;
  height: 100vh;
  width: 100vw;
}

/* ═══ Sidebar ═══ */
.sidebar {
  width: var(--sidebar-w);
  min-width: var(--sidebar-w);
  background: var(--bg-card);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 20px 12px;
}

.sidebar-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px 24px;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 16px;
}

.logo-icon {
  font-size: 22px;
  color: var(--accent-bright);
  animation: spin 8s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.logo-text {
  font-weight: 700;
  font-size: 17px;
  letter-spacing: 0.5px;
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
}

.nav-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  text-align: left;
}

.nav-btn:hover {
  background: var(--bg-elevated);
  color: var(--text);
}

.nav-btn.active {
  background: var(--accent-soft);
  color: var(--accent-bright);
}

.nav-btn.active svg {
  color: var(--accent-bright);
}

.sidebar-footer {
  padding-top: 12px;
  border-top: 1px solid var(--border-subtle);
}

/* Connection Status */
.conn-status {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  font-size: 12px;
  color: var(--text-tertiary);
}

.conn-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 6px #22c55e60;
}

.conn-status.disconnected .conn-dot {
  background: var(--danger);
  box-shadow: 0 0 6px #ef444460;
}

/* ═══ Main Content ═══ */
.main-content {
  flex: 1;
  overflow-y: auto;
  padding: 32px 48px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* ═══ Content Sections ═══ */
.content-section {
  display: none;
  width: 100%;
  max-width: 760px;
}

.content-section.active {
  display: block;
}

/* Timer section centers content */
#timer-section {
  align-items: center;
}

/* ═══ Cards ═══ */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  margin-bottom: 20px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.3);
}

.card-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 20px;
  letter-spacing: 0.3px;
}

/* ═══ Setup Card ═══ */
.setup-card {
  max-width: 560px;
  margin: 0 auto;
}

/* Mode Toggle */
.mode-toggle {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 22px;
}

.mode-btn {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  color: var(--text-secondary);
}

.mode-btn.active {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--text);
}

.mode-label {
  font-size: 14px;
  font-weight: 600;
}

.mode-desc {
  font-size: 11px;
  color: var(--text-tertiary);
}

.mode-btn.active .mode-desc { color: var(--text-secondary); }

/* Input Groups */
.input-group {
  margin-bottom: 20px;
}

.input-group label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.optional {
  font-size: 11px;
  color: var(--text-tertiary);
  font-weight: 400;
}

.value-badge {
  background: var(--accent-soft);
  color: var(--accent-bright);
  padding: 2px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  font-family: 'JetBrains Mono', monospace;
}

/* Duration inputs */
.duration-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

input[type="number"] {
  width: 90px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 11px 14px;
  color: var(--text);
  font-size: 17px;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 500;
  text-align: center;
  transition: var(--transition);
}

input[type="number"]:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.unit {
  font-size: 13px;
  color: var(--text-tertiary);
}

/* Time input */
.time-input {
  width: 100%;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 11px 16px;
  color: var(--text);
  font-size: 17px;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 500;
  transition: var(--transition);
  color-scheme: dark;
}

.time-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

/* Select */
.select-input {
  width: 100%;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 11px 16px;
  color: var(--text);
  font-size: 14px;
  transition: var(--transition);
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M3 5l3 3 3-3' stroke='%2394a3b8' stroke-width='1.5' fill='none'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 36px;
}

.select-input:focus {
  outline: none;
  border-color: var(--accent);
}

.select-input option {
  background: var(--bg-elevated);
  color: var(--text);
}

.select-input.compact {
  padding: 9px 30px 9px 14px;
  font-size: 13px;
}

/* Slider */
.slider-container {
  position: relative;
}

.slider {
  -webkit-appearance: none;
  width: 100%;
  height: 6px;
  background: var(--bg-elevated);
  border-radius: 3px;
  outline: none;
  margin-bottom: 8px;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  background: var(--accent-bright);
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 0 12px var(--accent-glow);
  transition: var(--transition);
}

.slider::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}

.slider::-moz-range-thumb {
  width: 20px;
  height: 20px;
  background: var(--accent-bright);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 0 12px var(--accent-glow);
}

.slider-labels {
  display: flex;
  justify-content: space-between;
  font-size: 10px;
  color: var(--text-tertiary);
  font-family: 'JetBrains Mono', monospace;
}

/* Schedule Preview */
.schedule-preview {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 22px;
}

.preview-title {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: var(--text-tertiary);
  margin-bottom: 12px;
  font-weight: 600;
}

.timeline {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.timeline-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  font-family: 'JetBrains Mono', monospace;
}

.timeline-bar {
  height: 8px;
  border-radius: 4px;
  transition: width 300ms ease;
}

.timeline-bar.focus {
  background: linear-gradient(90deg, var(--accent), var(--accent-bright));
}

.timeline-bar.break {
  background: linear-gradient(90deg, var(--break-color), #fbbf24);
}

.timeline-time {
  color: var(--text-secondary);
  width: 64px;
  font-size: 12px;
}

.timeline-label {
  color: var(--text-tertiary);
  font-size: 11px;
  min-width: 40px;
  text-align: right;
}

/* Start Button */
.start-btn {
  width: 100%;
  background: linear-gradient(135deg, var(--accent), #2563eb);
  border: none;
  border-radius: var(--radius);
  padding: 16px;
  color: white;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  box-shadow: 0 4px 24px var(--accent-glow);
}

.start-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 32px var(--accent-glow);
}

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

/* ═══ Timer Card ═══ */
.timer-card {
  max-width: 560px;
  margin: 0 auto;
  text-align: center;
}

.phase-indicator {
  margin-bottom: 20px;
}

.phase-dots {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-bottom: 12px;
}

.phase-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--border);
  transition: var(--transition);
}

.phase-dot.active {
  background: var(--accent-bright);
  box-shadow: 0 0 10px var(--accent-glow);
}

.phase-dot.done {
  background: var(--text-tertiary);
}

.phase-label {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 0.5px;
}

.phase-sub {
  font-size: 13px;
  color: var(--text-tertiary);
  margin-top: 3px;
}

/* Timer Ring */
.timer-ring-container {
  position: relative;
  width: 320px;
  height: 320px;
  margin: 0 auto 24px;
}

.timer-ring {
  transform: rotate(-90deg);
}

.ring-bg {
  fill: none;
  stroke: var(--border);
  stroke-width: 5;
}

.ring-progress {
  fill: none;
  stroke: var(--accent-bright);
  stroke-width: 5;
  stroke-linecap: round;
  transition: stroke-dashoffset 1s linear, stroke 300ms;
  filter: drop-shadow(0 0 8px var(--accent-glow));
}

.ring-progress.break-phase {
  stroke: var(--break-color);
  filter: drop-shadow(0 0 8px #f59e0b40);
}

.timer-display {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
}

.timer-time {
  font-family: 'JetBrains Mono', monospace;
  font-size: 52px;
  font-weight: 600;
  letter-spacing: -1px;
  color: var(--text);
  line-height: 1;
}

.timer-phase-label {
  font-size: 13px;
  color: var(--text-tertiary);
  margin-top: 8px;
  text-transform: uppercase;
  letter-spacing: 2px;
}

/* Session Meta */
.session-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
  justify-content: center;
}

.quality-rating {
  display: flex;
  align-items: center;
  gap: 8px;
}

.quality-label {
  font-size: 13px;
  color: var(--text-tertiary);
}

.stars {
  display: flex;
  gap: 3px;
}

.star {
  background: none;
  border: none;
  color: var(--border);
  font-size: 16px;
  cursor: pointer;
  transition: var(--transition);
  padding: 2px;
}

.star.active {
  color: var(--accent-bright);
  text-shadow: 0 0 8px var(--accent-glow);
}

.star:hover { color: var(--text-secondary); }

/* Controls */
.controls {
  display: flex;
  justify-content: center;
  gap: 16px;
}

.ctrl-btn {
  width: 54px;
  height: 54px;
  border-radius: 50%;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.ctrl-btn:hover {
  background: var(--bg-hover);
  color: var(--text);
  border-color: var(--text-tertiary);
}

.ctrl-btn.stop:hover {
  border-color: var(--danger);
  color: var(--danger);
}

/* Mini Toggle */
.mini-toggle {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 14px;
  color: var(--text-secondary);
  font-size: 13px;
  cursor: pointer;
  transition: var(--transition);
}

.toggle-row {
  display: flex;
  gap: 10px;
  margin: 20px auto 0;
  justify-content: center;
}

.mini-toggle:hover {
  background: var(--bg-elevated);
  color: var(--text);
}

.sound-toggle.active {
  color: var(--accent-bright);
}

/* ═══ Stats View ═══ */
.kpi-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 20px;
}

.kpi-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
}

.kpi-value {
  font-family: 'JetBrains Mono', monospace;
  font-size: 28px;
  font-weight: 700;
  color: var(--accent-bright);
  line-height: 1;
  margin-bottom: 6px;
}

.kpi-label {
  font-size: 12px;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.8px;
}

.chart-card {
  min-height: 200px;
}

.chart-container {
  width: 100%;
  position: relative;
}

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

/* SVG Chart Styles */
.chart-svg {
  width: 100%;
  height: auto;
  display: block;
}

.chart-axis {
  stroke: var(--border);
  stroke-width: 1;
}

.chart-grid {
  stroke: var(--border-subtle);
  stroke-width: 1;
  stroke-dasharray: 4 4;
}

.chart-label {
  fill: var(--text-tertiary);
  font-size: 10px;
  font-family: 'JetBrains Mono', monospace;
}

.chart-bar {
  transition: opacity 200ms;
}

.chart-bar:hover { opacity: 0.8; }

.chart-line {
  fill: none;
  stroke: var(--accent-bright);
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-linejoin: round;
  filter: drop-shadow(0 0 4px var(--accent-glow));
}

.chart-area {
  fill: url(#chart-gradient);
  opacity: 0.3;
}

.chart-dot {
  fill: var(--accent-bright);
  r: 3;
}

.chart-dot:hover { r: 5; }

/* Fach distribution bars */
.fach-bar-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.fach-bar-label {
  font-size: 13px;
  color: var(--text-secondary);
  min-width: 80px;
}

.fach-bar-track {
  flex: 1;
  height: 24px;
  background: var(--bg-elevated);
  border-radius: 6px;
  overflow: hidden;
}

.fach-bar-fill {
  height: 100%;
  border-radius: 6px;
  transition: width 500ms ease;
}

.fach-bar-value {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--text-tertiary);
  min-width: 50px;
  text-align: right;
}

/* Recent sessions list */
.recent-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 300px;
  overflow-y: auto;
}

.recent-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  background: var(--bg-elevated);
  border-radius: var(--radius-sm);
  font-size: 13px;
  transition: var(--transition);
}

.recent-item:hover {
  background: var(--bg-hover);
}

.recent-fach {
  display: flex;
  align-items: center;
  gap: 8px;
}

.fach-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.recent-time {
  font-family: 'JetBrains Mono', monospace;
  color: var(--text-secondary);
}

.recent-quality {
  display: flex;
  gap: 1px;
}

.recent-quality .star {
  font-size: 10px;
  cursor: default;
}

/* ═══ Mini View ═══ */
.mini-container {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  box-shadow: 0 12px 40px rgba(0,0,0,0.5);
  z-index: 9999;
  cursor: pointer;
}

.mini-ring svg { transform: rotate(-90deg); }
.mini-ring .ring-bg { stroke: var(--border); }
.mini-ring .ring-progress {
  stroke: var(--accent-bright);
  stroke-width: 3;
  fill: none;
  stroke-linecap: round;
  transition: stroke-dashoffset 1s linear;
}

.mini-time {
  font-family: 'JetBrains Mono', monospace;
  font-size: 20px;
  font-weight: 600;
  color: var(--text);
  min-width: 60px;
}

.mini-expand {
  background: none;
  border: none;
  color: var(--text-tertiary);
  cursor: pointer;
  font-size: 18px;
  padding: 2px;
  transition: var(--transition);
}

.mini-expand:hover { color: var(--text); }

/* ═══ Responsive ═══ */
@media (max-width: 768px) {
  .sidebar { display: none; }
  .main-content { padding: 20px 16px; }
  .kpi-row { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: 1fr; }
  .timer-ring-container { width: 260px; height: 260px; }
  .timer-ring { width: 260px; height: 260px; }
  .timer-time { font-size: 40px; }
  .ring-progress { r: 120; }
  .timer-ring-container svg { width: 260px; height: 260px; }
}

@media (max-width: 480px) {
  .main-content { padding: 16px 12px; }
  .card { padding: 20px; }
  .kpi-row { grid-template-columns: 1fr 1fr; gap: 10px; }
  .kpi-value { font-size: 22px; }
}