/* ============================================
   BRAINBOOKMARK - Component Design System
   "Analog Signal" - Retro Telephone Aesthetic
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=DM+Mono:wght@400;500&family=Instrument+Sans:wght@400;500;600;700&display=swap');

/* ----------------------------------------
   CSS Custom Properties
   ---------------------------------------- */
:root {
  /* Base - Warm cream like aged phone plastic */
  --bg-primary: #F5F0E6;
  --bg-secondary: #EDE6D6;
  --bg-card: #FEFCF7;
  --bg-overlay: rgba(45, 42, 38, 0.85);

  /* Accent - Telephone switchboard green */
  --accent-primary: #4A5D4A;
  --accent-primary-hover: #3D4E3D;
  --accent-glow: #7CB87C;

  /* Warm accent - Vintage dial tone amber */
  --accent-warm: #C4956A;
  --accent-warm-light: #E8C9A8;
  --accent-warm-hover: #B5865B;

  /* Status colors */
  --color-success: #5A8A5A;
  --color-error: #B85C5C;
  --color-error-light: #F5E6E6;

  /* Text */
  --text-primary: #2C2C2C;
  --text-secondary: #6B6B6B;
  --text-muted: #9A9A9A;
  --text-inverse: #FEFCF7;

  /* Numpad specific */
  --key-bg: #FEFEFE;
  --key-bg-gradient: linear-gradient(180deg, #FFFFFF 0%, #F8F6F1 100%);
  --key-shadow: #D4CFC3;
  --key-shadow-deep: #B8B3A6;
  --key-border: #E8E3D9;
  --key-pressed: #F0EBE0;
  --trace-line: #4A5D4A;
  --trace-glow: rgba(122, 184, 122, 0.7);

  /* Typography */
  --font-display: 'DM Mono', monospace;
  --font-body: 'Instrument Sans', sans-serif;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;

  /* Border radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;

  /* Shadows */
  --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-card-hover: 0 4px 16px rgba(0, 0, 0, 0.08), 0 2px 4px rgba(0, 0, 0, 0.04);
  --shadow-key: 0 3px 0 var(--key-shadow), 0 4px 8px rgba(0, 0, 0, 0.1);
  --shadow-key-pressed: 0 1px 0 var(--key-shadow), 0 2px 4px rgba(0, 0, 0, 0.08);
  --shadow-button: 0 2px 0 var(--accent-primary-hover), 0 3px 6px rgba(0, 0, 0, 0.12);

  /* Transitions */
  --transition-fast: 120ms ease-out;
  --transition-normal: 200ms ease-out;
  --transition-slow: 350ms ease-out;
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  min-height: 100vh;
  touch-action: manipulation;
}

/* Subtle paper texture overlay */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  pointer-events: none;
  opacity: 0.03;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
  z-index: 9999;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 500;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

input {
  font-family: inherit;
  border: none;
  outline: none;
  -webkit-tap-highlight-color: transparent;
}

/* Global tap highlight removal */
* {
  -webkit-tap-highlight-color: transparent;
}

/* ----------------------------------------
   Component: Spacing Comparison
   ---------------------------------------- */
.spacing-comparison {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
  overflow-x: auto;
  padding-bottom: var(--space-sm);
}

.spacing-comparison__item {
  flex: 1;
  min-width: 140px;
  background: var(--bg-secondary);
  padding: var(--space-md);
  border-radius: var(--radius-lg);
  text-align: center;
}

.spacing-comparison__label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: var(--space-md);
}

.spacing-comparison__label--good {
  color: var(--color-success);
  font-weight: 600;
}

.spacing-comparison__preview {
  height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-md);
}

.spacing-comparison__preview svg {
  width: 100%;
  height: 100%;
  max-width: 80px;
}

.spacing-comparison__code {
  font-family: var(--font-display);
  font-size: 1.125rem;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
  letter-spacing: 0.1em;
}

.spacing-comparison__desc {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.spacing-comparison__arrow {
  color: var(--text-muted);
}

@media (max-width: 480px) {
  /* Remove stacking for spacing comparison, keep it horizontal */
  .spacing-comparison {
    flex-direction: row;
    gap: var(--space-xs);
  }
  
  .spacing-comparison__item {
    min-width: 0; /* Allow shrinking */
    padding: var(--space-sm);
  }

  .spacing-comparison__label {
    font-size: 0.625rem;
    margin-bottom: var(--space-sm);
  }

  .spacing-comparison__code {
    font-size: 0.875rem;
  }

  .spacing-comparison__desc {
    font-size: 0.625rem;
    line-height: 1.2;
  }

  .spacing-comparison__preview {
    height: 60px;
    margin-bottom: var(--space-sm);
  }
  
  .spacing-comparison__preview svg {
    max-width: 50px;
  }

  .spacing-comparison__arrow svg {
    width: 16px;
    height: 16px;
  }
  
  .modal__body {
    padding: var(--space-lg) var(--space-md); /* Reduce side padding on mobile modal */
  }
}

/* ----------------------------------------
   Component: Header / Navigation
   ---------------------------------------- */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  background: var(--bg-card);
  border-bottom: 1px solid var(--bg-secondary);
}

.header__logo {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--text-primary);
  letter-spacing: 0.02em;
}

.header__logo span {
  color: var(--accent-primary);
}

.header__actions {
  display: flex;
  gap: var(--space-sm);
}

.header__btn {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: var(--bg-secondary);
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.header__btn:hover {
  background: var(--key-shadow);
}

.header__btn svg {
  width: 20px;
  height: 20px;
}

/* ----------------------------------------
   Component: Password Entry Screen
   ---------------------------------------- */
.password-screen {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--bg-primary);
  z-index: 1000;
  padding: var(--space-lg);
  overflow-y: auto;
}

.password-card {
  width: 100%;
  max-width: 380px;
  padding: var(--space-2xl);
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-card);
  text-align: center;
  margin-bottom: var(--space-xl);
  flex-shrink: 0;
}

/* ----------------------------------------
   Component: Site Context (Details)
   ---------------------------------------- */
.site-context {
  width: 100%;
  max-width: 420px;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--bg-secondary);
  overflow: hidden;
  transition: all var(--transition-normal);
}

.site-context[open] {
  box-shadow: var(--shadow-card);
}

.site-context__summary {
  list-style: none;
  padding: var(--space-md) var(--space-lg);
  cursor: pointer;
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--accent-primary);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  background: var(--bg-secondary);
  user-select: none;
}

.site-context__summary::-webkit-details-marker {
  display: none;
}

.site-context__summary:hover {
  background: var(--key-shadow);
}

.site-context__summary svg {
  color: var(--accent-warm);
}

.site-context__content {
  padding: var(--space-lg);
  border-top: 1px solid var(--bg-secondary);
  max-height: 40vh;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--key-shadow) transparent;
}

.site-context__content::-webkit-scrollbar {
  width: 4px;
}

.site-context__content::-webkit-scrollbar-track {
  background: transparent;
}

.site-context__content::-webkit-scrollbar-thumb {
  background: var(--key-shadow);
  border-radius: 2px;
}

.site-context__section {
  margin-bottom: var(--space-lg);
}

.site-context__section:last-child {
  margin-bottom: 0;
}

.site-context__section h3 {
  font-family: var(--font-display);
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
  border-bottom: 1px solid var(--bg-secondary);
  padding-bottom: 4px;
}

.site-context__section p {
  font-size: 0.875rem;
  color: var(--text-primary);
  line-height: 1.5;
}

.site-context__section ul {
  padding-left: var(--space-md);
  margin-top: var(--space-sm);
}

.site-context__section li {
  font-size: 0.8125rem;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

.site-context__section code {
  font-family: var(--font-display);
  background: var(--bg-secondary);
  padding: 2px 4px;
  border-radius: 4px;
  font-size: 0.75rem;
  color: var(--accent-primary);
}

.password-card__icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-secondary);
  border-radius: 50%;
  color: var(--accent-primary);
}

.password-card__icon svg {
  width: 28px;
  height: 28px;
}

.password-card__title {
  font-size: 1.5rem;
  margin-bottom: var(--space-sm);
}

.password-card__subtitle {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  margin-bottom: var(--space-xl);
}

.password-input {
  position: relative;
  margin-bottom: var(--space-lg);
}

.password-input__field {
  width: 100%;
  padding: var(--space-md) var(--space-lg);
  font-family: var(--font-display);
  font-size: 1.25rem;
  letter-spacing: 0.15em;
  text-align: center;
  background: var(--bg-secondary);
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.password-input__field:focus {
  background: var(--bg-card);
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 4px rgba(74, 93, 74, 0.1);
}

.password-input__field::placeholder {
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

/* ----------------------------------------
   Component: Buttons
   ---------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.btn--primary {
  width: 100%;
  background: var(--accent-primary);
  color: var(--text-inverse);
  box-shadow: var(--shadow-button);
}

.btn--primary:hover {
  background: var(--accent-primary-hover);
  transform: translateY(-1px);
}

.btn--primary:active {
  transform: translateY(1px);
  box-shadow: 0 1px 0 var(--accent-primary-hover);
}

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

.btn--secondary:hover {
  background: var(--key-shadow);
}

.btn--warm {
  background: var(--accent-warm);
  color: var(--text-inverse);
  box-shadow: 0 2px 0 var(--accent-warm-hover), 0 3px 6px rgba(0, 0, 0, 0.12);
}

.btn--warm:hover {
  background: var(--accent-warm-hover);
}

.btn--ghost {
  background: transparent;
  color: var(--text-secondary);
  padding: var(--space-sm) var(--space-md);
}

.btn--ghost:hover {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.btn--small {
  padding: var(--space-sm) var(--space-md);
  font-size: 0.75rem;
}

/* ----------------------------------------
   Component: Category Pills
   ---------------------------------------- */
.category-pill {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-sm);
  font-family: var(--font-display);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border-radius: var(--radius-sm);
  border: 1px solid currentColor;
}

.category-pill--credit {
  color: var(--accent-warm);
  background: rgba(196, 149, 106, 0.08);
}

.category-pill--id {
  color: var(--accent-primary);
  background: rgba(74, 93, 74, 0.08);
}

.category-pill--custom {
  color: var(--text-secondary);
  background: rgba(107, 107, 107, 0.08);
}

.category-pill__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}

/* ----------------------------------------
   Component: Number Cards
   ---------------------------------------- */
.number-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow-card);
  transition: all var(--transition-normal);
}

.number-card:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-2px);
}

.number-card__header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.number-card__name {
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-primary);
  flex: 1;
}

.number-card__number {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  color: var(--text-primary);
  margin-bottom: var(--space-lg);
  word-break: break-all;
}

.number-card__number span {
  color: var(--text-muted);
}

.number-card__actions {
  display: flex;
  gap: var(--space-sm);
}

.number-card__btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.number-card__btn--play {
  background: var(--accent-primary);
  color: var(--text-inverse);
}

.number-card__btn--play:hover {
  background: var(--accent-primary-hover);
}

.number-card__btn--practice {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.number-card__btn--practice:hover {
  background: var(--key-shadow);
}

.number-card__btn svg {
  width: 14px;
  height: 14px;
}

/* ----------------------------------------
   Component: The Numpad (Hero)
   ---------------------------------------- */
.numpad {
  position: relative;
  display: inline-block;
  padding: var(--space-lg);
  background: var(--bg-secondary);
  border-radius: var(--radius-xl);
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.04);
}

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

.numpad__key {
  position: relative;
  width: 64px;
  height: 64px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--key-bg-gradient);
  border: 1px solid var(--key-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-key);
  transition: all var(--transition-fast);
  user-select: none;
}

.numpad__key:hover {
  background: var(--key-bg);
}

/* Active state handled by Anime.js for elastic effect */
.numpad__key:active {
  background: var(--key-pressed);
}

.numpad__key--pressed {
  background: var(--key-pressed);
}

.numpad__key--highlighted {
  background: rgba(74, 93, 74, 0.1);
  border-color: var(--accent-primary);
}

.numpad__key-number {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1;
}

.numpad__key-letters {
  font-family: var(--font-body);
  font-size: 0.5625rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  margin-top: 2px;
}

/* Special keys */
.numpad__key--wide {
  grid-column: span 2;
  width: auto;
}

.numpad__key--action {
  background: var(--accent-primary);
  border-color: var(--accent-primary-hover);
  box-shadow: 0 3px 0 var(--accent-primary-hover), 0 4px 8px rgba(0, 0, 0, 0.15);
}

.numpad__key--action .numpad__key-number {
  color: var(--text-inverse);
}

.numpad__key--action:hover {
  background: var(--accent-primary);
}

.numpad__key--action:active {
  background: var(--accent-primary-hover);
  box-shadow: 0 1px 0 var(--accent-primary-hover);
}

/* Trace Line SVG Overlay */
.numpad__trace {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 10;
  overflow: visible;
  /* Force GPU acceleration for Safari mobile */
  -webkit-transform: translateZ(0);
  transform: translateZ(0);
}

.numpad__trace-path {
  fill: none;
  stroke: var(--trace-line);
  stroke-width: 4;
  stroke-linecap: round;
  stroke-linejoin: round;
  filter: drop-shadow(0 0 6px var(--trace-glow));
  -webkit-filter: drop-shadow(0 0 6px var(--trace-glow));
  will-change: stroke-dashoffset, opacity;
}

/* Trace animation */
.numpad__trace-path--animated {
  stroke-dasharray: 1000;
  stroke-dashoffset: 1000;
  animation: trace-draw 1.5s ease-out forwards;
}

@keyframes trace-draw {
  to {
    stroke-dashoffset: 0;
  }
}

/* Dot at current position */
.numpad__trace-dot {
  fill: var(--accent-glow);
  filter: drop-shadow(0 0 8px var(--trace-glow));
}

/* History paths (faded previous segments) */
/* Note: stroke color is preserved from inline style set during active phase */
.numpad__trace-path--history {
  fill: none;
  stroke-width: 4;
  stroke-linecap: round;
  stroke-linejoin: round;
  /* Opacity controlled via JS animation for Safari compatibility */
  -webkit-filter: none;
  filter: none;
}

/* Active path (current segment) - inherits base trace-path styles */
.numpad__trace-path--active {
  fill: none;
  stroke-width: 4;
  stroke-linecap: round;
  stroke-linejoin: round;
  opacity: 1;
  -webkit-filter: drop-shadow(0 0 6px var(--trace-glow));
  will-change: stroke-dashoffset;
}

/* Large numpad variant for play/practice modes */
.numpad--large {
  padding: var(--space-xl);
}

.numpad--large .numpad__key {
  width: 80px;
  height: 80px;
}

.numpad--large .numpad__key-number {
  font-size: 2rem;
}

.numpad--large .numpad__key-letters {
  font-size: 0.625rem;
}

/* ----------------------------------------
   Component: Play Mode Overlay
   ---------------------------------------- */
.play-overlay {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--bg-overlay);
  z-index: 100;
  padding: var(--space-md);
}

.play-overlay__close {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  color: var(--text-inverse);
  transition: all var(--transition-fast);
}

.play-overlay__close:hover {
  background: rgba(255, 255, 255, 0.2);
}

.play-overlay__replay {
  position: absolute;
  top: var(--space-md);
  right: calc(var(--space-md) + 54px);
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  color: var(--text-inverse);
  transition: all var(--transition-fast);
}

.play-overlay__replay:hover {
  background: rgba(255, 255, 255, 0.2);
}

.play-overlay__display {
  margin-bottom: var(--space-md);
  text-align: center;
  width: 100%;
  max-width: 320px;
}

.play-overlay__number {
  font-family: var(--font-display);
  font-size: 2.5rem;
  color: var(--text-inverse);
  background: #1C1C1C;
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-lg);
  box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.4);
  letter-spacing: 0.12em;
  white-space: nowrap;
  overflow: hidden;
}

.play-overlay__number span {
  opacity: 0.3;
}

.play-overlay__number .current {
  opacity: 1;
  color: var(--accent-glow);
}

.play-overlay__progress {
  display: flex;
  gap: var(--space-sm);
  margin-top: var(--space-md);
}

.play-overlay__progress-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  transition: all var(--transition-fast);
}

.play-overlay__progress-dot--active {
  background: var(--accent-glow);
  box-shadow: 0 0 8px var(--trace-glow);
}

.play-overlay__progress-dot--complete {
  background: var(--text-inverse);
}

/* ----------------------------------------
   Component: Trace Previews
   ---------------------------------------- */
.trace-previews {
  display: flex;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-sm);
  margin-top: var(--space-sm);
  margin-bottom: var(--space-sm);
  overflow-x: auto;
  max-width: 100%;
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, 0.3) transparent;
}

.trace-previews::-webkit-scrollbar {
  height: 4px;
}

.trace-previews::-webkit-scrollbar-track {
  background: transparent;
}

.trace-previews::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.3);
  border-radius: 2px;
}

.trace-preview {
  flex-shrink: 0;
  width: 56px;
  height: 72px;
  background: var(--bg-secondary);
  border: 1px solid var(--bg-secondary);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
}

.trace-preview:hover {
  border-color: var(--accent-warm-light);
  transform: scale(1.05);
}

.trace-preview:active {
  transform: scale(0.98);
}

.trace-preview--active {
  border-color: var(--accent-glow);
  box-shadow: 0 0 8px var(--trace-glow);
}

.trace-preview__svg {
  width: 44px;
  height: 60px;
}

.trace-preview__path {
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* ----------------------------------------
   Component: Practice Mode
   ---------------------------------------- */
.practice-display {
  background: #1C1C1C;
  border-radius: var(--radius-lg);
  padding: var(--space-lg) var(--space-xl);
  margin-bottom: var(--space-xl);
  min-width: 280px;
  text-align: center;
  box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.4);
}

.practice-display__input {
  font-family: var(--font-display);
  font-size: 2rem;
  letter-spacing: 0.15em;
  color: #7CB87C;
  background: transparent;
  width: 100%;
  text-align: left;
  text-shadow: 0 0 10px rgba(124, 184, 124, 0.5);
}

.practice-display__input::placeholder {
  color: #3A3A3A;
  text-shadow: none;
}

.practice-display--error {
  background: #2C1C1C;
}

.practice-display--error .practice-display__input {
  color: #B85C5C;
  text-shadow: 0 0 10px rgba(184, 92, 92, 0.5);
}

.practice-display--success {
  background: #1C2C1C;
}

.practice-display--success .practice-display__input {
  color: #7CB87C;
  animation: success-pulse 0.5s ease-out;
}

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

.practice-hint {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  margin-top: var(--space-lg);
  padding: var(--space-md);
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  color: var(--text-inverse);
  font-size: 0.875rem;
}

.practice-hint svg {
  width: 18px;
  height: 18px;
  color: var(--accent-warm-light);
}

/* ----------------------------------------
   Component: Modal / Add Number Form
   ---------------------------------------- */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: var(--bg-overlay);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-lg);
  z-index: 200;
}

/* Native Dialog Styles */
.modal-dialog {
  border: none;
  background: transparent;
  padding: 0;
  width: 100%;
  max-width: 420px;
  margin: auto;
}

.modal-dialog::backdrop {
  background: var(--bg-overlay);
}

.modal-dialog[open] {
  display: flex; /* Helps center content if needed, though margin:auto usually works */
  animation: fade-in 0.2s ease-out;
}

@keyframes fade-in {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.modal {
  width: 100%;
  max-width: 420px;
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.2);
}

.modal__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-lg) var(--space-xl);
  border-bottom: 1px solid var(--bg-secondary);
}

.modal__title {
  font-size: 1.125rem;
}

.modal__close {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  transition: all var(--transition-fast);
}

.modal__close:hover {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.modal__body {
  padding: var(--space-xl);
}

.modal__footer {
  display: flex;
  gap: var(--space-sm);
  padding: var(--space-lg) var(--space-xl);
  background: var(--bg-secondary);
}

.modal__footer .btn {
  flex: 1;
}

/* Form elements */
.form-group {
  margin-bottom: var(--space-lg);
}

.form-group:last-child {
  margin-bottom: 0;
}

.form-label {
  display: block;
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
}

.form-input {
  width: 100%;
  padding: var(--space-md);
  font-size: 1rem;
  background: var(--bg-secondary);
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.form-input:focus {
  background: var(--bg-card);
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 4px rgba(74, 93, 74, 0.1);
}

.form-input--mono {
  font-family: var(--font-display);
  letter-spacing: 0.08em;
}

.form-select {
  width: 100%;
  padding: var(--space-md);
  font-size: 1rem;
  background: var(--bg-secondary);
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%236B6B6B' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-md) center;
  padding-right: var(--space-2xl);
  transition: all var(--transition-fast);
}

.form-select:focus {
  background-color: var(--bg-card);
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 4px rgba(74, 93, 74, 0.1);
}

.form-hint {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-top: var(--space-xs);
}

/* Number preview */
.number-preview {
  padding: var(--space-md);
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  margin-top: var(--space-sm);
}

.number-preview__label {
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: var(--space-xs);
}

.number-preview__value {
  font-family: var(--font-display);
  font-size: 1.25rem;
  letter-spacing: 0.1em;
  color: var(--text-primary);
}

/* ----------------------------------------
   Component: Empty State
   ---------------------------------------- */
.empty-state {
  text-align: center;
  padding: var(--space-2xl);
}

.empty-state__icon {
  width: 80px;
  height: 80px;
  margin: 0 auto var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-secondary);
  border-radius: 50%;
  color: var(--text-muted);
}

.empty-state__icon svg {
  width: 36px;
  height: 36px;
}

.empty-state__title {
  font-size: 1.125rem;
  margin-bottom: var(--space-sm);
}

.empty-state__text {
  color: var(--text-secondary);
  margin-bottom: var(--space-xl);
  max-width: 280px;
  margin-left: auto;
  margin-right: auto;
}

/* ----------------------------------------
   Component: Toast / Notifications
   ---------------------------------------- */
.toast {
  position: fixed;
  bottom: var(--space-xl);
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  padding: var(--space-md) var(--space-xl);
  background: var(--text-primary);
  color: var(--text-inverse);
  border-radius: var(--radius-lg);
  font-size: 0.9375rem;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
  opacity: 0;
  transition: all var(--transition-normal);
  z-index: 300;
}

.toast--visible {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

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

.toast--error {
  background: var(--color-error);
}

/* ----------------------------------------
   Layout: Container
   ---------------------------------------- */
.container {
  width: 100%;
  max-width: 480px;
  margin: 0 auto;
  padding: var(--space-lg);
}

/* ----------------------------------------
   Layout: Card Grid
   ---------------------------------------- */
.card-grid {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

/* ----------------------------------------
   Section Headers
   ---------------------------------------- */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-md);
}

.section-title {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
}

/* ----------------------------------------
   Demo Page Specific Styles
   ---------------------------------------- */
.demo-section {
  margin-bottom: var(--space-2xl);
  padding-bottom: var(--space-2xl);
  border-bottom: 1px dashed var(--key-shadow);
}

.demo-section:last-child {
  border-bottom: none;
}

.demo-title {
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-primary);
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-sm);
  border-bottom: 2px solid var(--accent-primary);
  display: inline-block;
}

.demo-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  align-items: flex-start;
}

.demo-numpad-container {
  display: flex;
  justify-content: center;
  padding: var(--space-xl) 0;
}

/* ----------------------------------------
   Utility Classes
   ---------------------------------------- */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

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

.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }
.mt-2xl { margin-top: var(--space-2xl); }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }

/* ----------------------------------------
   Responsive Adjustments
   ---------------------------------------- */
@media (max-width: 480px) {
  :root {
    --space-lg: 20px;
    --space-xl: 28px;
    --space-2xl: 40px;
  }

  .numpad__key {
    width: 56px;
    height: 56px;
  }

  .numpad__key-number {
    font-size: 1.25rem;
  }

  .numpad--large .numpad__key {
    width: 72px;
    height: 72px;
  }

  .numpad--large .numpad__key-number {
    font-size: 1.75rem;
  }

  .modal {
    max-width: 100%;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
  }

  .play-overlay__number {
    font-size: 2rem;
  }
}

/* Larger screens */
@media (min-width: 768px) {
  .container {
    max-width: 600px;
  }

  .card-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ----------------------------------------
   Component: Password Error
   ---------------------------------------- */
.password-error {
  color: var(--color-error);
  font-size: 0.875rem;
  margin-bottom: var(--space-md);
  display: none;
}

.password-input__field.error {
  border-color: var(--color-error);
  background: var(--color-error-light);
}

/* ----------------------------------------
   Component: Filter Pills
   ---------------------------------------- */
.filter-container {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.filter-pill {
  display: inline-flex;
  align-items: center;
  padding: var(--space-sm) var(--space-md);
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border-radius: var(--radius-md);
  background: var(--bg-secondary);
  color: var(--text-secondary);
  border: 1px solid transparent;
  transition: all var(--transition-fast);
  cursor: pointer;
}

.filter-pill:hover {
  background: var(--key-shadow);
  color: var(--text-primary);
}

.filter-pill--active {
  background: var(--accent-primary);
  color: var(--text-inverse);
}

.filter-pill--active:hover {
  background: var(--accent-primary-hover);
  color: var(--text-inverse);
}

/* ----------------------------------------
   Component: Number Card Menu
   ---------------------------------------- */
.number-card {
  position: relative;
}

.number-card__menu {
  position: relative;
  flex-shrink: 0;
}

.number-card__menu-btn {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  transition: all var(--transition-fast);
}

.number-card__menu-btn:hover {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.number-card__menu-btn svg {
  width: 16px;
  height: 16px;
}

.number-card__dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  margin-top: var(--space-xs);
  min-width: 120px;
  background: var(--bg-card);
  border: 1px solid var(--bg-secondary);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card-hover);
  z-index: 50;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--transition-fast);
}

.number-card__dropdown--visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.number-card__dropdown-item {
  display: block;
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  font-family: var(--font-body);
  font-size: 0.875rem;
  text-align: left;
  color: var(--text-primary);
  transition: background var(--transition-fast);
}

.number-card__dropdown-item:hover {
  background: var(--bg-secondary);
}

.number-card__dropdown-item:first-child {
  border-radius: var(--radius-md) var(--radius-md) 0 0;
}

.number-card__dropdown-item:last-child {
  border-radius: 0 0 var(--radius-md) var(--radius-md);
}

.number-card__dropdown-item--danger {
  color: var(--color-error);
}

.number-card__dropdown-item--danger:hover {
  background: var(--color-error-light);
}

/* ----------------------------------------
   Component: Practice Hint Button
   ---------------------------------------- */
.practice-hint-btn {
  margin-top: var(--space-xl);
  color: var(--text-inverse);
}

/* ----------------------------------------
   Component: Play Replay Button
   ---------------------------------------- */
.play-replay-btn {
  margin-top: var(--space-xl);
  color: var(--text-inverse);
}

.play-replay-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-inverse);
}

.play-replay-btn svg {
  color: var(--accent-warm-light);
}

.practice-hint-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-inverse);
}

.practice-hint-btn svg {
  color: var(--accent-warm-light);
}

/* ----------------------------------------
   Play Overlay Number Segments
   ---------------------------------------- */
.play-overlay__number .completed {
  opacity: 0.4;
}

.play-overlay__number .current {
  color: var(--accent-glow);
  opacity: 1;
}