/* ===== Color Scheme ===== */
:root {
  /* Background colors */
  --bg-primary: #eef2f7;
  --bg-card: #ffffff;
  --bg-active: #e3f0ff;
  --bg-header: #0d47a1;
  --bg-total: #e3f0ff;
  --bg-success: #e8f5e9;
  --bg-warning: #fff3e0;
  --bg-danger: #fce4ec;

  /* Border colors */
  --border-card: #b8c9dc;
  --border-active: #1565c0;
  --border-total: #1565c0;

  /* Text colors */
  --text-primary: #1a1a2e;
  --text-secondary: #556680;
  --text-header: #ffffff;
  --text-total: #0d47a1;

  /* Accent colors */
  --accent-primary: #0d47a1;
  --accent-light: #1565c0;
  --success: #2e7d32;
  --warning: #e65100;
  --danger: #c62828;

  /* Button colors */
  --btn-plus-bg: #1565c0;
  --btn-plus-text: #ffffff;
  --btn-minus-bg: #c62828;
  --btn-minus-text: #ffffff;

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

  /* Touch targets */
  --touch-target-min: 44px;
  --touch-target-button: 56px;

  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-normal: 300ms ease-in-out;

  /* Border radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  /* Font */
  --font-system: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  --font-size-base: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 20px;
  --font-size-2xl: 24px;
  --font-size-3xl: 28px;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-bold: 700;

  /* Line height */
  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;

  /* Shadow */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
}

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

html,
body {
  height: 100%;
  width: 100%;
  -webkit-user-select: none;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  -webkit-touch-callout: none;
}

body {
  font-family: var(--font-system);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--text-primary);
  background-color: var(--bg-primary);
  padding-top: env(safe-area-inset-top);
  padding-bottom: env(safe-area-inset-bottom);
  padding-left: env(safe-area-inset-left);
  padding-right: env(safe-area-inset-right);
  overflow-x: hidden;
}

/* ===== Typography ===== */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  margin-bottom: var(--spacing-md);
}

h1 {
  font-size: var(--font-size-3xl);
}

h2 {
  font-size: var(--font-size-2xl);
}

h3 {
  font-size: var(--font-size-xl);
}

p {
  margin-bottom: var(--spacing-md);
}

/* ===== Links ===== */
a {
  color: var(--accent-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:active {
  color: var(--accent-light);
}

/* ===== Header Bar ===== */
.header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: var(--bg-header);
  color: var(--text-header);
  padding: var(--spacing-md) var(--spacing-lg);
  padding-top: max(var(--spacing-md), env(safe-area-inset-top));
  padding-bottom: var(--spacing-md);
  box-shadow: var(--shadow-md);
  position: relative;
  z-index: 100;
  min-height: max(56px, calc(56px + env(safe-area-inset-top)));
}

.header-bar h1 {
  margin-bottom: 0;
  font-size: var(--font-size-2xl);
  color: var(--text-header);
}

.header-bar .title {
  flex: 1;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.sync-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  background-color: rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-base);
  color: var(--text-header);
  animation: pulse 1.5s ease-in-out infinite;
}

.sync-badge.synced {
  animation: none;
}

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

/* ===== Badge Styles ===== */
.badge {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: var(--font-weight-medium);
  line-height: var(--line-height-tight);
}

.badge-success {
  background-color: var(--bg-success);
  color: var(--success);
}

.badge-warning {
  background-color: var(--bg-warning);
  color: var(--warning);
}

.badge-danger {
  background-color: var(--bg-danger);
  color: var(--danger);
}

/* ===== Button Styles ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: var(--touch-target-min);
  min-width: var(--touch-target-min);
  padding: var(--spacing-sm) var(--spacing-md);
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-system);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--transition-fast);
  touch-action: manipulation;
  -webkit-user-select: none;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.btn:active {
  transform: scale(0.98);
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-primary {
  background-color: var(--accent-light);
  color: white;
}

.btn-primary:active:not(:disabled) {
  background-color: var(--accent-primary);
}

.btn-danger {
  background-color: var(--danger);
  color: white;
}

.btn-danger:active:not(:disabled) {
  background-color: #a81919;
}

.btn-outline {
  background-color: transparent;
  color: var(--accent-primary);
  border: 2px solid var(--accent-primary);
}

.btn-outline:active:not(:disabled) {
  background-color: var(--bg-active);
}

.btn-large {
  min-height: var(--touch-target-button);
  padding: var(--spacing-md) var(--spacing-lg);
  font-size: var(--font-size-lg);
}

.btn-icon-only {
  min-width: var(--touch-target-button);
  min-height: var(--touch-target-button);
  padding: 0;
  border-radius: var(--radius-md);
}

/* ===== Card Styles ===== */
.card {
  background-color: var(--bg-card);
  border: 2px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
  margin-bottom: var(--spacing-md);
  position: relative;
}

.card:active {
  box-shadow: var(--shadow-md);
}

.card-paused {
  border-left: 6px solid var(--warning);
}

/* ===== Filter Tabs ===== */
.filter-tabs {
  display: flex;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-lg);
  background-color: var(--bg-primary);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scroll-behavior: smooth;
}

.filter-tab {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: var(--touch-target-min);
  padding: var(--spacing-sm) var(--spacing-md);
  border: 2px solid var(--border-card);
  border-radius: var(--radius-md);
  background-color: var(--bg-card);
  color: var(--text-secondary);
  font-weight: var(--font-weight-medium);
  white-space: nowrap;
  cursor: pointer;
  transition: all var(--transition-fast);
  touch-action: manipulation;
}

.filter-tab:active {
  border-color: var(--accent-light);
}

.filter-tab.active {
  background-color: var(--bg-active);
  border-color: var(--border-active);
  color: var(--accent-primary);
}

/* ===== Diameter Grid ===== */
.diameter-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--spacing-md);
  padding: var(--spacing-md) var(--spacing-lg);
  background-color: var(--bg-primary);
  margin-bottom: 120px;
}

.diameter-tile {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md);
  background-color: var(--bg-card);
  border: 2px solid var(--border-card);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  min-height: 140px;
}

.diameter-tile:active {
  border-color: var(--accent-light);
  box-shadow: var(--shadow-md);
}

.diameter-label {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--text-primary);
  text-align: center;
  word-break: break-word;
}

.count-display {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--accent-primary);
  min-height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.plus-btn,
.minus-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: var(--touch-target-min);
  min-width: var(--touch-target-min);
  border: none;
  border-radius: var(--radius-md);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  cursor: pointer;
  transition: all var(--transition-fast);
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

.plus-btn {
  background-color: var(--btn-plus-bg);
  color: var(--btn-plus-text);
}

.plus-btn:active {
  background-color: #0d47a1;
  transform: scale(0.95);
}

.minus-btn {
  background-color: var(--btn-minus-bg);
  color: var(--btn-minus-text);
}

.minus-btn:active {
  background-color: #a81919;
  transform: scale(0.95);
}

.plus-btn:disabled,
.minus-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ===== Total Bar (Fixed Bottom) ===== */
.total-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: var(--bg-total);
  border-top: 3px solid var(--border-total);
  padding: var(--spacing-md) var(--spacing-lg);
  padding-bottom: max(var(--spacing-md), env(safe-area-inset-bottom));
  box-shadow: var(--shadow-lg);
  z-index: 50;
}

.total-bar-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-lg);
  max-width: 100%;
}

.total-bar-label {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--text-secondary);
  white-space: nowrap;
}

.total-bar-value {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--text-total);
  min-width: 80px;
  text-align: right;
}

/* ===== Input History ===== */
.input-history {
  background-color: var(--bg-primary);
  padding: var(--spacing-md) var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

.input-history-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

.history-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 4px 10px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-sm);
  margin-bottom: 3px;
  font-size: 13px;
}

.history-item-detail {
  flex: 1;
  color: var(--text-secondary);
}

.undo-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 28px;
  min-width: 28px;
  padding: 2px 6px;
  background-color: var(--danger);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-size: 14px;
}

.undo-btn:active {
  background-color: #a81919;
  transform: scale(0.95);
}

/* ===== Form Styles ===== */
.form-group {
  margin-bottom: var(--spacing-lg);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

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

.form-input,
.form-select {
  min-height: var(--touch-target-min);
  padding: var(--spacing-sm) var(--spacing-md);
  border: 2px solid var(--border-card);
  border-radius: var(--radius-md);
  font-family: var(--font-system);
  font-size: var(--font-size-base);
  color: var(--text-primary);
  background-color: var(--bg-card);
  transition: all var(--transition-fast);
  -webkit-appearance: none;
  appearance: none;
}

.form-input:active,
.form-input:focus,
.form-select:active,
.form-select:focus {
  outline: none;
  border-color: var(--accent-light);
  box-shadow: 0 0 0 3px rgba(21, 101, 192, 0.1);
}

.form-select {
  background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%231565c0'%3e%3cpath d='M7 10l5 5 5-5z'/%3e%3c/svg%3e");
  background-repeat: no-repeat;
  background-position: right var(--spacing-md) center;
  background-size: 24px;
  padding-right: 44px;
}

/* ===== Modal Overlay ===== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  padding: var(--spacing-md);
  animation: fadeIn var(--transition-fast);
}

.modal-content {
  background-color: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  max-width: 90%;
  max-height: 90%;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  box-shadow: var(--shadow-lg);
  animation: slideUp var(--transition-normal);
}

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

@keyframes slideUp {
  from {
    transform: translateY(20px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

/* ===== Settings Page ===== */
.settings-card {
  background-color: var(--bg-card);
  border: 2px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
}

.settings-card h3 {
  margin-bottom: var(--spacing-md);
  color: var(--accent-primary);
}

.driver-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.driver-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 120px;
  padding: var(--spacing-md);
  background-color: var(--bg-primary);
  border: 2px solid var(--border-card);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--text-primary);
  touch-action: manipulation;
}

.driver-btn:active {
  border-color: var(--accent-light);
  background-color: var(--bg-active);
  box-shadow: var(--shadow-md);
}

.driver-btn.selected {
  background-color: var(--bg-active);
  border-color: var(--accent-light);
  color: var(--accent-primary);
}

/* ===== Notification Bar ===== */
.notification-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background-color: var(--warning);
  color: var(--text-primary);
  padding: var(--spacing-md) var(--spacing-lg);
  padding-top: max(var(--spacing-md), env(safe-area-inset-top));
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  text-align: center;
  z-index: 150;
  animation: slideDown var(--transition-normal);
}

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

/* ===== Update Overlay ===== */
.update-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--bg-card);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 300;
  gap: var(--spacing-lg);
  padding: var(--spacing-lg);
  text-align: center;
}

.update-overlay-icon {
  font-size: 64px;
  animation: spin 2s linear infinite;
}

@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

.update-overlay h2 {
  color: var(--accent-primary);
}

.update-overlay p {
  color: var(--text-secondary);
  max-width: 300px;
}

/* ===== Action Bar (Bottom Buttons) ===== */
.action-bar {
  display: flex;
  gap: var(--spacing-md);
  padding: var(--spacing-md) var(--spacing-lg);
  background-color: var(--bg-primary);
  margin-bottom: max(120px, calc(120px + env(safe-area-inset-bottom)));
  flex-wrap: wrap;
}

.action-bar .btn {
  flex: 1;
  min-height: var(--touch-target-button);
  font-size: var(--font-size-lg);
}

/* ===== Info Panel ===== */
.info-panel {
  background-color: var(--bg-active);
  border: 2px solid var(--border-active);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.info-panel-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid var(--border-active);
}

.info-panel-row:last-child {
  border-bottom: none;
}

.info-panel-label {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--text-secondary);
}

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

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

.visible {
  display: block !important;
}

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

.mt-lg {
  margin-top: var(--spacing-lg);
}

.mb-lg {
  margin-bottom: var(--spacing-lg);
}

.p-lg {
  padding: var(--spacing-lg);
}

.gap-md {
  gap: var(--spacing-md);
}

.flex {
  display: flex;
}

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

.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.flex-col {
  display: flex;
  flex-direction: column;
}

/* ===== Responsive Design ===== */
@media (max-width: 600px) {
  .header-bar {
    padding: var(--spacing-sm) var(--spacing-md);
  }

  .header-bar h1 {
    font-size: var(--font-size-xl);
  }

  .diameter-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
  }

  .total-bar-content {
    flex-direction: column;
    gap: var(--spacing-sm);
  }

  .filter-tabs {
    padding: var(--spacing-sm) var(--spacing-md);
  }

  .action-bar {
    flex-direction: column;
  }

  .action-bar .btn {
    min-width: 100%;
  }
}

/* ===== Dark Mode Support (Optional) ===== */
@media (prefers-color-scheme: dark) {
  :root {
    --bg-primary: #1a1a2e;
    --bg-card: #2d2d44;
    --bg-active: #1e3a5f;
    --bg-header: #0d47a1;
    --bg-total: #1e3a5f;

    --border-card: #3d3d54;
    --border-active: #1565c0;
    --border-total: #1565c0;

    --text-primary: #f5f5f5;
    --text-secondary: #b0b0c0;
  }

  body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
  }

  .form-input,
  .form-select {
    background-color: var(--bg-card);
    color: var(--text-primary);
  }
}

/* ===== Print Styles ===== */
@media print {
  body {
    padding: 0;
  }

  .header-bar,
  .total-bar,
  .notification-bar,
  .action-bar {
    display: none;
  }

  .diameter-grid {
    margin-bottom: var(--spacing-lg);
  }
}