/**
 * Exercise Tracker - Mobile-first CSS
 * Built with CSS custom properties for theming
 */

/* ===== CSS Custom Properties ===== */
:root {
  /* Colors */
  --color-primary: #4CAF50;
  --color-primary-dark: #388E3C;
  --color-primary-light: #81C784;
  --color-secondary: #2196F3;
  --color-accent: #FF9800;

  --color-success: #4CAF50;
  --color-warning: #FF9800;
  --color-error: #F44336;
  --color-info: #2196F3;

  --color-bg: #F5F5F5;
  --color-bg-card: #FFFFFF;
  --color-bg-elevated: #FFFFFF;

  --color-text: #212121;
  --color-text-secondary: #757575;
  --color-text-hint: #9E9E9E;
  --color-text-inverse: #FFFFFF;

  --color-border: #E0E0E0;
  --color-divider: #EEEEEE;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-xxl: 48px;

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-md: 1rem;
  --font-size-lg: 1.25rem;
  --font-size-xl: 1.5rem;
  --font-size-xxl: 2rem;
  --font-size-display: 3rem;

  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-bold: 700;

  --line-height-tight: 1.2;
  --line-height-normal: 1.5;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 4px 8px rgba(0, 0, 0, 0.15);
  --shadow-xl: 0 8px 16px rgba(0, 0, 0, 0.2);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 350ms ease;

  /* Z-index layers */
  --z-base: 0;
  --z-elevated: 10;
  --z-sticky: 100;
  --z-nav: 200;
  --z-modal-backdrop: 300;
  --z-modal: 400;
  --z-toast: 500;

  /* Layout */
  --nav-height: 64px;
  --header-height: 48px;
  --max-width: 600px;

  /* Safe areas for mobile */
  --safe-area-inset-top: env(safe-area-inset-top, 0px);
  --safe-area-inset-bottom: env(safe-area-inset-bottom, 0px);
  --safe-area-inset-left: env(safe-area-inset-left, 0px);
  --safe-area-inset-right: env(safe-area-inset-right, 0px);
}

/* Dark mode */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #121212;
    --color-bg-card: #1E1E1E;
    --color-bg-elevated: #2D2D2D;

    --color-text: #FFFFFF;
    --color-text-secondary: #B0B0B0;
    --color-text-hint: #808080;

    --color-border: #404040;
    --color-divider: #333333;
  }
}

/* ===== Reset & Base Styles ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-md);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
  min-height: 100dvh;
  overscroll-behavior: none;
}

body.modal-open {
  overflow: hidden;
}

/* ===== App Shell ===== */
.app-shell {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  min-height: 100dvh;
  max-width: var(--max-width);
  margin: 0 auto;
}

/* ===== App Header ===== */
app-header {
  display: block;
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background: var(--color-bg-elevated);
  border-bottom: 1px solid var(--color-border);
}

.app-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  padding-top: calc(var(--space-sm) + var(--safe-area-inset-top));
  min-height: var(--header-height);
}

.header-left {
  flex: 1;
}

.page-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
}

.header-center {
  flex: 0 0 auto;
}

.header-right {
  flex: 1;
  display: flex;
  justify-content: flex-end;
}

.header-right .user-info {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-xs) var(--space-sm);
  background: var(--color-bg);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
}

.header-right .user-icon {
  display: flex;
  align-items: center;
  color: var(--color-text-secondary);
}

.header-right .user-icon svg {
  width: 18px;
  height: 18px;
}

.header-right .user-name {
  font-weight: var(--font-weight-medium);
  max-width: 80px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.header-right .logout-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  padding: 0;
  background: transparent;
  border: none;
  border-radius: var(--radius-full);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.header-right .logout-btn svg {
  width: 16px;
  height: 16px;
}

.header-right .logout-btn:hover {
  background: var(--color-error);
  color: var(--color-text-inverse);
}

.app-content {
  flex: 1;
  padding-bottom: calc(var(--nav-height) + var(--safe-area-inset-bottom));
  overflow-y: auto;
}

.view-container {
  min-height: 100%;
  transition: opacity var(--transition-normal);
}

.view-container.loading {
  opacity: 0.5;
  pointer-events: none;
}

/* ===== Connection Status ===== */
.connection-status {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.status-indicator {
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
  background: var(--color-warning);
  transition: background var(--transition-normal);
}

.connection-status.connected .status-indicator {
  background: var(--color-success);
}

.connection-status.disconnected .status-indicator {
  background: var(--color-error);
  animation: pulse 1.5s infinite;
}

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

/* ===== Navigation Bar ===== */
nav-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: var(--z-nav);
}

.nav-bar {
  display: flex;
  justify-content: space-around;
  align-items: stretch;
  height: var(--nav-height);
  padding-bottom: var(--safe-area-inset-bottom);
  background: var(--color-bg-elevated);
  border-top: 1px solid var(--color-border);
  max-width: var(--max-width);
  margin: 0 auto;
}

.nav-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: var(--space-sm);
  background: none;
  border: none;
  color: var(--color-text-secondary);
  font-size: var(--font-size-xs);
  cursor: pointer;
  transition: color var(--transition-fast);
  -webkit-tap-highlight-color: transparent;
}

.nav-item:hover,
.nav-item:focus-visible {
  color: var(--color-primary);
}

.nav-item.active {
  color: var(--color-primary);
}

.nav-icon {
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-icon svg {
  width: 24px;
  height: 24px;
}

/* ===== View Headers ===== */
.view-header {
  padding: var(--space-md);
  background: var(--color-bg-elevated);
  border-bottom: 1px solid var(--color-border);
}

.view-title,
.app-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
}

/* ===== Dashboard View ===== */
.dashboard-view {
  display: flex;
  flex-direction: column;
  min-height: 100%;
}

.dashboard-view .view-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.gauge-section {
  padding: var(--space-lg);
  display: flex;
  justify-content: center;
}

.stats-section {
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

/* ===== Login View ===== */
.login-view {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-lg);
}

.login-form {
  width: 100%;
  max-width: 420px;
  background: var(--color-bg-card);
  padding: var(--space-lg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-border);
}

.login-form .form-row {
  margin-bottom: var(--space-md);
}

.login-form input[type="text"],
.login-form input[type="password"] {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-md);
  color: var(--color-text);
  background: transparent;
}

.form-actions {
  display: flex;
  gap: var(--space-sm);
  justify-content: space-between;
}

.login-btn,
.add-user-btn {
  flex: 1 1 0;
  padding: 10px 14px;
  border: none;
  border-radius: var(--radius-sm);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: transform var(--transition-fast);
}

.login-btn {
  background: linear-gradient(180deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-text-inverse);
}

.add-user-btn {
  background: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-border);
}

.login-btn:active,
.add-user-btn:active {
  transform: translateY(1px);
}

.logged-in-user {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
}

.selector-section {
  padding: var(--space-md);
  padding-bottom: var(--space-xl);
}

.action-buttons {
  padding: var(--space-md);
  display: flex;
  justify-content: center;
}

/* ===== Exercise Gauge ===== */
.gauge-wrapper {
  width: 100%;
  max-width: 300px;
}

.gauge-svg {
  width: 100%;
  height: auto;
}

.gauge-bg {
  fill: none;
  stroke: var(--color-border);
  stroke-width: 20;
  stroke-linecap: round;
}

.gauge-zone {
  fill: none;
  stroke-width: 20;
  stroke-linecap: round;
}

.gauge-zone-1 { stroke: var(--color-success); }
.gauge-zone-2 { stroke: var(--color-warning); }
.gauge-zone-3 { stroke: var(--color-error); }

.gauge-needle {
  stroke: var(--color-text);
  stroke-width: 3;
  stroke-linecap: round;
  transition: transform var(--transition-fast);
}

.gauge-center {
  fill: var(--color-text);
}

.gauge-label {
  font-size: 12px;
  fill: var(--color-text-secondary);
}

.gauge-value {
  font-size: 28px;
  font-weight: var(--font-weight-bold);
  fill: var(--color-text);
  text-anchor: middle;
}

.gauge-unit {
  font-size: 12px;
  fill: var(--color-text-secondary);
  text-anchor: middle;
}

/* ===== Session Stats ===== */
.session-stats {
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  box-shadow: var(--shadow-sm);
}

.stats-title {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-md);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

@media (max-width: 480px) {
  .stats-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-sm);
  }
}

.stat-item {
  text-align: center;
}

.stat-value {
  display: block;
  font-size: var(--font-size-xxl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  line-height: var(--line-height-tight);
}

.stat-label {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

/* ===== User Stats ===== */
.user-stats {
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  box-shadow: var(--shadow-sm);
}

.stats-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--color-divider);
}

.user-icon {
  font-size: 1.5rem;
}

.user-name {
  font-weight: var(--font-weight-medium);
}

.stats-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

.stat-card {
  background: var(--color-bg);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  text-align: center;
}

.card-title {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xs);
}

.card-value {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
}

.card-unit {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.card-secondary {
  font-size: var(--font-size-xs);
  color: var(--color-text-hint);
  margin-top: var(--space-xs);
}

/* ===== Exercise Selector ===== */
.exercise-selector {
  width: 100%;
}

.exercise-buttons {
  display: flex;
  gap: var(--space-sm);
  overflow-x: auto;
  padding: var(--space-xs);
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.exercise-buttons::-webkit-scrollbar {
  display: none;
}

.exercise-btn {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  min-width: 72px;
  padding: var(--space-sm) var(--space-md);
  background: var(--color-bg-card);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
  scroll-snap-align: start;
  -webkit-tap-highlight-color: transparent;
}

.exercise-btn:hover,
.exercise-btn:focus-visible {
  border-color: var(--exercise-color, var(--color-primary));
}

.exercise-btn.active {
  background: var(--exercise-color, var(--color-primary));
  border-color: var(--exercise-color, var(--color-primary));
  color: var(--color-text-inverse);
}

.exercise-icon {
  font-size: 1.5rem;
}

.exercise-name {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
}

/* ===== User Login ===== */
.user-login {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.user-select-wrapper {
  position: relative;
}

.user-select {
  appearance: none;
  padding: var(--space-sm) var(--space-xl) var(--space-sm) var(--space-md);
  font-size: var(--font-size-sm);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
}

.select-arrow {
  position: absolute;
  right: var(--space-sm);
  top: 50%;
  transform: translateY(-50%);
  pointer-events: none;
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
}

.password-group {
  display: flex;
  gap: var(--space-xs);
}

.password-input {
  padding: var(--space-sm);
  font-size: var(--font-size-sm);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  width: 120px;
}

.login-btn {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border: none;
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.login-btn:hover,
.login-btn:focus-visible {
  background: var(--color-primary-dark);
}

.logged-in-user {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-xs) var(--space-sm);
  background: var(--color-bg);
  border-radius: var(--radius-full);
}

.user-avatar {
  font-size: 1.25rem;
}

.logout-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  background: var(--color-border);
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.logout-btn:hover {
  background: var(--color-error);
  color: var(--color-text-inverse);
}

/* ===== Modal ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal-backdrop);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  background: rgba(0, 0, 0, 0.5);
  padding: var(--space-md);
  padding-bottom: calc(var(--space-md) + var(--safe-area-inset-bottom));
  animation: fadeIn var(--transition-normal) ease;
}

@media (min-width: 480px) {
  .modal-overlay {
    align-items: center;
  }
}

.modal-container {
  width: 100%;
  max-width: var(--max-width);
  max-height: 90vh;
  max-height: 90dvh;
  background: var(--color-bg-elevated);
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  animation: slideUp var(--transition-normal) ease;
}

@media (min-width: 480px) {
  .modal-container {
    border-radius: var(--radius-xl);
  }
}

.modal-small { max-width: 360px; }
.modal-large { max-width: 720px; }
.modal-fullscreen {
  max-width: 100%;
  max-height: 100%;
  height: 100%;
  border-radius: 0;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md);
  border-bottom: 1px solid var(--color-border);
}

.modal-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
}

.modal-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.modal-close:hover {
  background: var(--color-bg);
}

.close-icon {
  font-size: 1.5rem;
  color: var(--color-text-secondary);
}

.modal-body {
  flex: 1;
  padding: var(--space-lg);
  overflow-y: auto;
}

.modal-footer {
  padding: var(--space-md);
  border-top: 1px solid var(--color-border);
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideUp {
  from { transform: translateY(100%); }
  to { transform: translateY(0); }
}

/* ===== Toast Notifications ===== */
.toast-container {
  position: fixed;
  top: calc(var(--header-height) + var(--safe-area-inset-top) + var(--space-md));
  left: 50%;
  transform: translateX(-50%);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  width: calc(100% - var(--space-md) * 2);
  max-width: 400px;
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md);
  background: var(--color-bg-elevated);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  pointer-events: auto;
  opacity: 0;
  transform: translateY(-20px);
  transition: opacity var(--transition-normal), transform var(--transition-normal);
}

.toast-visible {
  opacity: 1;
  transform: translateY(0);
}

.toast-hiding {
  opacity: 0;
  transform: translateY(-20px);
}

.toast-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
}

.toast-info .toast-icon { background: var(--color-info); color: white; }
.toast-success .toast-icon { background: var(--color-success); color: white; }
.toast-warning .toast-icon { background: var(--color-warning); color: white; }
.toast-error .toast-icon { background: var(--color-error); color: white; }

.toast-message {
  flex: 1;
  font-size: var(--font-size-sm);
}

.toast-close {
  background: none;
  border: none;
  color: var(--color-text-secondary);
  cursor: pointer;
  padding: var(--space-xs);
  font-size: var(--font-size-lg);
}

/* ===== User Create Form ===== */
.user-create-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.form-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-sm);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.form-label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
}

.form-input {
  padding: var(--space-md);
  font-size: var(--font-size-md);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast);
  color: var(--color-text);
}

.form-input:focus {
  outline: none;
  border-color: var(--color-primary);
}

.form-submit {
  padding: var(--space-md);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border: none;
  border-radius: var(--radius-md);
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-bold);
  cursor: pointer;
  transition: background var(--transition-fast);
  margin-top: var(--space-sm);
}

.form-submit:hover,
.form-submit:focus-visible {
  background: var(--color-primary-dark);
}

/* ===== History View ===== */
.history-view {
  min-height: 100%;
}

.history-view .view-content {
  padding: var(--space-md);
}

.history-summary {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.summary-card {
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  text-align: center;
  box-shadow: var(--shadow-sm);
}

.summary-label {
  display: block;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xs);
}

.summary-value {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
}

.section-title {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
}

.activity-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.activity-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-md);
  background: var(--color-bg-card);
  border-radius: var(--radius-md);
}

.activity-date {
  font-weight: var(--font-weight-medium);
}

.activity-stats {
  text-align: right;
}

.activity-count {
  display: block;
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
}

.activity-distance {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.empty-state {
  text-align: center;
  padding: var(--space-xl);
  color: var(--color-text-hint);
}

/* ===== Settings View ===== */
.settings-view .view-content {
  padding: var(--space-md);
}

.settings-section {
  margin-bottom: var(--space-xl);
}

.settings-section .section-title {
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--color-border);
}

.setting-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--color-divider);
}

.setting-label {
  flex: 1;
  cursor: pointer;
}

.setting-name {
  display: block;
  font-weight: var(--font-weight-medium);
}

.setting-desc {
  display: block;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.setting-toggle {
  width: 48px;
  height: 28px;
  appearance: none;
  background: var(--color-border);
  border-radius: var(--radius-full);
  cursor: pointer;
  position: relative;
  transition: background var(--transition-fast);
}

.setting-toggle::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 24px;
  height: 24px;
  background: white;
  border-radius: var(--radius-full);
  transition: transform var(--transition-fast);
}

.setting-toggle:checked {
  background: var(--color-primary);
}

.setting-toggle:checked::after {
  transform: translateX(20px);
}

.setting-select {
  padding: var(--space-sm) var(--space-md);
  font-size: var(--font-size-sm);
  background: var(--color-bg);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.account-info {
  padding: var(--space-md) 0;
}

.account-label {
  color: var(--color-text-secondary);
  margin-right: var(--space-sm);
}

.account-user {
  font-weight: var(--font-weight-medium);
}

.about-info {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-medium);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  -webkit-tap-highlight-color: transparent;
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: var(--color-primary-dark);
}

.btn-secondary {
  background: var(--color-bg);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover,
.btn-secondary:focus-visible {
  background: var(--color-border);
}

.btn-create-user {
  background: var(--color-bg-card);
  color: var(--color-primary);
  border: 2px dashed var(--color-primary);
  border-radius: var(--radius-lg);
  padding: var(--space-md) var(--space-xl);
}

.btn-create-user:hover,
.btn-create-user:focus-visible {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border-style: solid;
}

.btn-icon {
  font-size: 1.25rem;
}

/* ===== Utility Classes ===== */
[hidden] {
  display: none !important;
}

/* Focus visible for keyboard navigation */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Disable outline for mouse users */
:focus:not(:focus-visible) {
  outline: none;
}

/* ===== Exercise View ===== */
.exercise-view {
  min-height: 100%;
}

.exercise-view .view-content {
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.exercise-picker .section-title {
  margin-bottom: var(--space-md);
}

.exercise-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

@media (min-width: 400px) {
  .exercise-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.exercise-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-lg);
  background: rgba(0, 0, 0, 0.2);
  border: 2px solid var(--exercise-color, var(--color-border));
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
  -webkit-tap-highlight-color: transparent;
  color: var(--color-text);
}

.exercise-card:hover,
.exercise-card:focus-visible {
  border-color: var(--exercise-color, var(--color-primary));
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.exercise-card.selected {
  background: rgba(0, 0, 0, 0.3);
  border-color: var(--exercise-color, var(--color-primary));
  color: var(--color-text);
}

.exercise-card .card-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--exercise-color, var(--color-primary));
}

.exercise-card .card-icon svg {
  width: 32px;
  height: 32px;
}

.exercise-card .card-name {
  font-weight: var(--font-weight-medium);
}

/* Exercise Entry Section */
.exercise-entry {
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow-sm);
  color: var(--color-text);
}

.selected-exercise-header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--color-divider);
  color: var(--color-text);
}

.selected-exercise-header .selected-icon {
  display: flex;
  color: var(--color-text);
}

.selected-exercise-header .selected-icon svg {
  width: 24px;
  height: 24px;
}

.selected-exercise-header .selected-name {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
}

.today-total {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.today-total .total-label {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.today-total .total-value {
  font-size: var(--font-size-xxl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
}

.today-total .total-unit {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

/* Amount Input */
.amount-input {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.amount-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: var(--color-bg);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-full);
  color: var(--color-text);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.amount-btn svg {
  width: 24px;
  height: 24px;
}

.amount-btn:hover,
.amount-btn:focus-visible {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-text-inverse);
}

.amount-field {
  width: 100px;
  padding: var(--space-md);
  font-size: var(--font-size-xxl);
  font-weight: var(--font-weight-bold);
  text-align: center;
  background: var(--color-bg);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  appearance: textfield;
  -webkit-appearance: textfield;
  -moz-appearance: textfield;
}

.amount-field::-webkit-outer-spin-button,
.amount-field::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.amount-field:focus {
  outline: none;
  border-color: var(--color-primary);
}

/* Quick Amount Buttons */
.quick-amounts {
  display: flex;
  justify-content: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.quick-btn {
  padding: var(--space-sm) var(--space-md);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.quick-btn:hover,
.quick-btn:focus-visible {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-text-inverse);
}

/* Add Exercise Button */
.add-exercise-btn {
  display: block;
  width: 100%;
  padding: var(--space-md);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border: none;
  border-radius: var(--radius-md);
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-bold);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.add-exercise-btn:hover,
.add-exercise-btn:focus-visible {
  background: var(--color-primary-dark);
}

/* Create Exercise Button */
.create-exercise {
  display: flex;
  justify-content: center;
}

.create-exercise-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  background: var(--color-bg-card);
  color: var(--color-primary);
  border: 2px dashed var(--color-primary);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.create-exercise-btn svg {
  width: 18px;
  height: 18px;
}

.create-exercise-btn:hover,
.create-exercise-btn:focus-visible {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border-style: solid;
}

/* Edit Selected Button - styled similarly to create but solid border */
.edit-selected-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-md);
  background: var(--color-bg-card);
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--transition-fast);
  margin-left: var(--space-sm);
}

.edit-selected-btn svg {
  width: 18px;
  height: 18px;
}

.edit-selected-btn:hover,
.edit-selected-btn:focus-visible {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}

.edit-selected-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  background: var(--color-bg-card);
  color: var(--color-text-secondary);
  border-color: var(--color-border);
}

/* ===== History View Updates ===== */
.history-summary {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.summary-card {
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  text-align: center;
  box-shadow: var(--shadow-sm);
}

/* Exercise Selector Dropdown */
.exercise-selector {
  position: relative;
  margin-bottom: var(--space-lg);
}

.selector-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: var(--space-md);
  background: var(--color-bg-card);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--font-size-md);
  cursor: pointer;
  transition: border-color var(--transition-fast);
}

.selector-btn:hover,
.selector-btn:focus-visible {
  border-color: var(--color-primary);
}

.selector-btn[aria-expanded="true"] {
  border-color: var(--color-primary);
  border-bottom-left-radius: 0;
  border-bottom-right-radius: 0;
}

.selector-icon,
.selector-chevron {
  display: flex;
  align-items: center;
}

.selector-icon svg,
.selector-chevron svg {
  width: 20px;
  height: 20px;
}

.selector-name {
  flex: 1;
  text-align: left;
  margin-left: var(--space-sm);
  font-weight: var(--font-weight-medium);
}

.selector-chevron {
  color: var(--color-text-secondary);
  transition: transform var(--transition-fast);
}

.selector-btn[aria-expanded="true"] .selector-chevron {
  transform: rotate(180deg);
}

.selector-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--color-bg-card);
  border: 1px solid var(--color-primary);
  border-top: none;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  list-style: none;
  max-height: 240px;
  overflow-y: auto;
  z-index: var(--z-elevated);
  box-shadow: var(--shadow-lg);
}

.selector-option {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md);
  cursor: pointer;
  color: var(--color-text);
  transition: background var(--transition-fast);
}

.selector-option:hover {
  background: var(--color-bg);
}

.selector-option.selected {
  background: var(--color-bg);
  color: var(--color-primary);
  font-weight: var(--font-weight-medium);
}

.option-icon {
  display: flex;
  align-items: center;
}

.option-icon svg {
  width: 20px;
  height: 20px;
}

.option-name {
  flex: 1;
}

.selector-option svg:last-child {
  width: 18px;
  height: 18px;
  color: var(--color-primary);
}

/* Bar Chart */
.chart-section {
  margin-bottom: var(--space-lg);
}

.bar-chart-container {
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.bar-chart {
  display: flex;
  align-items: flex-end;
  gap: 1px;
  height: 120px;
  width: 100%;
}

.chart-bar {
  flex: 1;
  min-width: 1px;
  max-width: 4px;
  height: var(--bar-height, 0%);
  min-height: 1px;
  background: var(--bar-color, var(--color-primary));
  border-radius: 1px 1px 0 0;
  transition: height var(--transition-fast);
}

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

.chart-legend {
  display: flex;
  justify-content: space-between;
  padding: var(--space-sm) var(--space-md) 0;
  font-size: var(--font-size-xs);
  color: var(--color-text-hint);
}

/* ===== Exercise Create Form ===== */
.exercise-create-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.form-hint {
  display: block;
  font-size: var(--font-size-xs);
  color: var(--color-text-hint);
  margin-top: var(--space-xs);
}

/* Icon Picker */
.icon-picker {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.icon-option {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: var(--color-bg);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.icon-option svg {
  width: 24px;
  height: 24px;
}

.icon-option {
  color: var(--color-text);
}

.icon-option:hover,
.icon-option:focus-visible {
  border-color: var(--color-primary);
}

.icon-option.selected {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-text-inverse);
  box-shadow: 0 2px 8px rgba(0,0,0,0.25);
}

.icon-option.selected svg {
  fill: currentColor;
}

/* Color Picker */
.color-picker {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.color-option {
  width: 32px;
  height: 32px;
  border: 2px solid transparent;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
}

.color-option:hover,
.color-option:focus-visible {
  transform: scale(1.1);
}

.color-option.selected {
  border-color: var(--color-text);
  box-shadow: 0 0 0 2px var(--color-bg-card);
}

.color-option.selected::after {
  content: '✓';
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  text-shadow: 0 1px 2px rgba(0,0,0,0.3);
}