/* style.css — PitchPerfect Design System */

/* ============================================
   CUSTOM TOKENS — PitchPerfect palette
   ============================================ */

:root {
  /* Type scale */
  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.9rem  + 0.5vw,  1.125rem);
  --text-lg:   clamp(1.125rem, 0.95rem + 0.85vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1rem    + 1.5vw,  2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.5rem);
  --text-3xl:  clamp(2.5rem,   1rem    + 4vw,    5rem);

  /* Spacing */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-spring: 400ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Content widths */
  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;

  /* Fonts */
  --font-display: 'Nunito', system-ui, sans-serif;
  --font-body: 'DM Sans', system-ui, sans-serif;
}

/* ============================================
   LIGHT THEME
   ============================================ */
:root, [data-theme="light"] {
  --color-bg:       #FFFFFF;
  --color-surface:  #F7F7F7;
  --color-surface-2: #EBEBEB;
  --color-border:   #E5E5E5;
  --color-divider:  #E5E5E5;

  --color-text:     #3C3C3C;
  --color-text-muted: #777777;
  --color-text-faint: #AAAAAA;
  --color-text-inverse: #FFFFFF;

  /* Brand */
  --color-primary:          #58CC02;
  --color-primary-hover:    #4db800;
  --color-primary-active:   #3d9200;
  --color-primary-highlight: #e8fad5;
  --color-primary-text:     #FFFFFF;

  --color-gold:             #FFC800;
  --color-gold-hover:       #e6b400;
  --color-gold-text:        #3C3C3C;

  --color-error:            #FF4B4B;
  --color-error-hover:      #e03c3c;
  --color-error-highlight:  #ffe5e5;

  --color-accent-purple:    #CE82FF;
  --color-accent-blue:      #1CB0F6;
  --color-accent-blue-hover: #0e9de0;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.07);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.10);
  --shadow-xl: 0 24px 48px rgba(0,0,0,0.12);
}

/* ============================================
   DARK THEME
   ============================================ */
[data-theme="dark"] {
  --color-bg:       #131F24;
  --color-surface:  #1B2B34;
  --color-surface-2: #243B4A;
  --color-border:   #2D4150;
  --color-divider:  #2D4150;

  --color-text:     #E0E0E0;
  --color-text-muted: #8899A6;
  --color-text-faint: #546E7A;
  --color-text-inverse: #131F24;

  --color-primary:          #58CC02;
  --color-primary-hover:    #6bdd15;
  --color-primary-active:   #7ee828;
  --color-primary-highlight: #1a3008;
  --color-primary-text:     #FFFFFF;

  --color-gold:             #FFC800;
  --color-gold-hover:       #ffd433;
  --color-gold-text:        #131F24;

  --color-error:            #FF4B4B;
  --color-error-hover:      #ff6b6b;
  --color-error-highlight:  #3d1010;

  --color-accent-purple:    #CE82FF;
  --color-accent-blue:      #1CB0F6;
  --color-accent-blue-hover: #4cc3f9;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.5);
  --shadow-xl: 0 24px 48px rgba(0,0,0,0.6);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg:       #131F24;
    --color-surface:  #1B2B34;
    --color-surface-2: #243B4A;
    --color-border:   #2D4150;
    --color-divider:  #2D4150;
    --color-text:     #E0E0E0;
    --color-text-muted: #8899A6;
    --color-text-faint: #546E7A;
    --color-text-inverse: #131F24;
    --color-primary:  #58CC02;
    --color-primary-hover: #6bdd15;
    --color-primary-active: #7ee828;
    --color-primary-highlight: #1a3008;
    --color-primary-text: #FFFFFF;
    --color-gold:     #FFC800;
    --color-gold-hover: #ffd433;
    --color-gold-text: #131F24;
    --color-error:    #FF4B4B;
    --color-error-hover: #ff6b6b;
    --color-error-highlight: #3d1010;
    --color-accent-purple: #CE82FF;
    --color-accent-blue: #1CB0F6;
    --color-accent-blue-hover: #4cc3f9;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
    --shadow-lg: 0 12px 32px rgba(0,0,0,0.5);
    --shadow-xl: 0 24px 48px rgba(0,0,0,0.6);
  }
}

/* ============================================
   LAYOUT
   ============================================ */

.app-wrapper {
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
}

/* ============================================
   NAV
   ============================================ */

.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-3) var(--space-6);
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  color: var(--color-text);
  cursor: pointer;
}

.nav-logo-text {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-base);
  letter-spacing: -0.02em;
  color: var(--color-text);
}

.nav-logo-text span {
  color: var(--color-primary);
}

.nav-tabs {
  display: flex;
  gap: var(--space-1);
  flex: 1;
  justify-content: center;
}

.nav-tab {
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 600;
  font-family: var(--font-body);
  color: var(--color-text-muted);
  transition: all var(--transition-interactive);
  cursor: pointer;
  background: none;
  border: none;
}

.nav-tab:hover {
  background: var(--color-surface-2);
  color: var(--color-text);
}

.nav-tab.active {
  background: var(--color-primary-highlight);
  color: var(--color-primary);
}

.nav-stats {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.nav-stat {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-sm);
  font-weight: 600;
  font-family: var(--font-body);
  color: var(--color-text);
}

.nav-stat .icon {
  font-size: 1em;
}

.nav-stat.streak { color: #FF9600; }
.nav-stat.xp { color: var(--color-accent-blue); }
.nav-stat.day-badge {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.nav-btn {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  transition: all var(--transition-interactive);
  border: 1px solid transparent;
}

.nav-btn:hover {
  background: var(--color-surface-2);
  color: var(--color-text);
  border-color: var(--color-border);
}

/* ============================================
   MAIN CONTENT
   ============================================ */

.page {
  display: none;
  flex: 1;
  padding: var(--space-8) var(--space-6);
  max-width: var(--content-default);
  width: 100%;
  margin: 0 auto;
}

.page.active {
  display: block;
}

/* Session page — full width */
.page.session-page {
  max-width: 100%;
  padding: 0;
}

/* ============================================
   HOME PAGE
   ============================================ */

.home-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  max-width: 680px;
  margin: 0 auto;
}

/* Today Card */
.today-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-2xl);
  padding: var(--space-8);
  box-shadow: var(--shadow-md);
}

.today-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: var(--space-6);
}

.phase-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: var(--color-primary-highlight);
  color: var(--color-primary);
  border-radius: var(--radius-full);
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: 700;
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.today-day {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-weight: 500;
  text-align: right;
}

.today-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-xl);
  color: var(--color-text);
  margin-bottom: var(--space-2);
  letter-spacing: -0.02em;
}

.today-desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-6);
}

/* Phase progress */
.phase-progress-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-2);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-weight: 500;
}

.progress-bar {
  height: 8px;
  background: var(--color-surface-2);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-bottom: var(--space-6);
}

.progress-bar-fill {
  height: 100%;
  background: var(--color-primary);
  border-radius: var(--radius-full);
  transition: width var(--transition-spring);
}

/* Block indicators */
.blocks-row {
  display: flex;
  gap: var(--space-3);
  margin-bottom: var(--space-8);
}

.block-indicator {
  flex: 1;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-lg);
  border: 1.5px solid var(--color-border);
  background: var(--color-bg);
  font-size: var(--text-xs);
  font-weight: 600;
  font-family: var(--font-body);
  color: var(--color-text-muted);
  transition: all var(--transition-interactive);
}

.block-indicator.completed {
  border-color: var(--color-primary);
  background: var(--color-primary-highlight);
  color: var(--color-primary);
}

.block-indicator.active {
  border-color: var(--color-accent-blue);
  background: color-mix(in oklab, var(--color-accent-blue) 12%, transparent);
  color: var(--color-accent-blue);
}

.block-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: currentColor;
  opacity: 0.5;
  flex-shrink: 0;
}

.block-indicator.completed .block-dot { opacity: 1; }

/* Start button */
.btn-start {
  width: 100%;
  padding: var(--space-4) var(--space-6);
  border-radius: var(--radius-xl);
  background: var(--color-primary);
  color: white;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-lg);
  letter-spacing: -0.01em;
  border: none;
  cursor: pointer;
  transition: all var(--transition-interactive);
  box-shadow: 0 4px 16px color-mix(in oklab, var(--color-primary) 40%, transparent);
}

.btn-start:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 6px 20px color-mix(in oklab, var(--color-primary) 50%, transparent);
}

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

.btn-start:disabled {
  background: var(--color-surface-2);
  color: var(--color-text-muted);
  box-shadow: none;
  cursor: not-allowed;
  transform: none;
}

.btn-start.done {
  background: var(--color-surface-2);
  color: var(--color-text-muted);
  box-shadow: none;
  font-size: var(--text-base);
}

/* ============================================
   COMPLETED STATE
   ============================================ */

.session-complete-card {
  text-align: center;
}

.complete-icon {
  font-size: 3rem;
  margin-bottom: var(--space-4);
  display: block;
}

.complete-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--text-xl);
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.complete-subtitle {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  margin-bottom: var(--space-6);
}

.complete-stats {
  display: flex;
  justify-content: center;
  gap: var(--space-6);
  margin-bottom: var(--space-6);
}

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

.complete-stat-value {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-lg);
  color: var(--color-primary);
  display: block;
}

.complete-stat-label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-weight: 500;
}

/* ============================================
   OVERALL PROGRESS SECTION
   ============================================ */

.section-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-base);
  color: var(--color-text);
  margin-bottom: var(--space-4);
  letter-spacing: -0.01em;
}

.overall-progress {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
}

.overall-progress-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: var(--space-3);
}

.overall-progress-label {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
}

.overall-progress-pct {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.progress-bar.overall {
  height: 12px;
  margin-bottom: var(--space-4);
}

.progress-bar.overall .progress-bar-fill {
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent-blue));
}

.overall-stats {
  display: flex;
  gap: var(--space-6);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.overall-stats strong {
  color: var(--color-text);
  font-weight: 600;
}

/* Phase cards */
.phases-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-3);
}

@media (max-width: 480px) {
  .phases-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.phase-card {
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  text-align: center;
}

.phase-card.completed {
  border-color: var(--color-primary);
  background: var(--color-primary-highlight);
}

.phase-card.current {
  border-color: var(--color-accent-blue);
  background: color-mix(in oklab, var(--color-accent-blue) 8%, var(--color-surface));
}

.phase-card.locked {
  opacity: 0.5;
}

.phase-card-icon {
  font-size: 1.5rem;
  margin-bottom: var(--space-2);
  display: block;
}

.phase-card-name {
  font-size: var(--text-xs);
  font-weight: 700;
  font-family: var(--font-display);
  color: var(--color-text);
  display: block;
}

.phase-card-status {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-1);
  display: block;
}

.phase-card.completed .phase-card-status { color: var(--color-primary); }
.phase-card.current .phase-card-status { color: var(--color-accent-blue); }

/* ============================================
   SESSION PAGE
   ============================================ */

.session-wrapper {
  min-height: calc(100dvh - 57px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-6);
}

/* Interstitial */
.interstitial {
  max-width: 480px;
  width: 100%;
  text-align: center;
}

.interstitial-checkmark {
  width: 64px;
  height: 64px;
  background: var(--color-primary-highlight);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-6);
  font-size: 1.75rem;
}

.interstitial-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-xl);
  color: var(--color-text);
  margin-bottom: var(--space-2);
  letter-spacing: -0.02em;
}

.interstitial-subtitle {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
}

.interstitial-score {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-lg);
  color: var(--color-primary);
  margin-bottom: var(--space-8);
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-8);
  border-radius: var(--radius-xl);
  background: var(--color-primary);
  color: white;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-base);
  border: none;
  cursor: pointer;
  transition: all var(--transition-interactive);
  box-shadow: 0 4px 16px color-mix(in oklab, var(--color-primary) 40%, transparent);
}

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

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-xl);
  background: var(--color-surface-2);
  color: var(--color-text);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-sm);
  border: 1px solid var(--color-border);
  cursor: pointer;
  transition: all var(--transition-interactive);
}

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

/* Session header */
.session-header {
  width: 100%;
  max-width: 680px;
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.session-back-btn {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  flex-shrink: 0;
  transition: all var(--transition-interactive);
}

.session-back-btn:hover {
  background: var(--color-surface-2);
  color: var(--color-text);
}

.session-progress-bar {
  flex: 1;
  height: 8px;
  background: var(--color-surface-2);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.session-progress-fill {
  height: 100%;
  background: var(--color-primary);
  border-radius: var(--radius-full);
  transition: width 300ms ease;
}

.session-progress-text {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  white-space: nowrap;
  font-weight: 600;
}

/* Block container */
.block-container {
  width: 100%;
  max-width: 680px;
}

/* ============================================
   LEARN BLOCK
   ============================================ */

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

.learn-label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: color-mix(in oklab, var(--color-accent-purple) 15%, transparent);
  color: var(--color-accent-purple);
  border-radius: var(--radius-full);
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: 700;
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-4);
}

.learn-item-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-2xl);
  padding: var(--space-8);
  margin-bottom: var(--space-6);
}

.learn-note-name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--text-3xl);
  letter-spacing: -0.04em;
  color: var(--color-text);
  margin-bottom: var(--space-2);
  display: block;
}

.learn-note-subtitle {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-6);
}

.learn-reference-song {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}

.learn-quality-tag {
  display: inline-block;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 600;
  margin-bottom: var(--space-4);
}

.btn-listen {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-8);
  border-radius: var(--radius-xl);
  background: color-mix(in oklab, var(--color-accent-blue) 15%, transparent);
  border: 2px solid var(--color-accent-blue);
  color: var(--color-accent-blue);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-base);
  cursor: pointer;
  transition: all var(--transition-interactive);
  margin-bottom: var(--space-6);
}

.btn-listen:hover {
  background: color-mix(in oklab, var(--color-accent-blue) 25%, transparent);
}

.btn-listen.playing {
  background: var(--color-accent-blue);
  color: white;
}

/* Piano Keyboard */
.piano-keyboard {
  display: flex;
  justify-content: center;
  position: relative;
  margin: var(--space-4) auto;
  height: 80px;
  max-width: 420px;
  user-select: none;
}

.piano-keys {
  display: flex;
  gap: 2px;
  align-items: flex-start;
  position: relative;
}

.key-white {
  width: 28px;
  height: 76px;
  background: var(--color-bg);
  border: 1.5px solid var(--color-border);
  border-radius: 0 0 4px 4px;
  position: relative;
  cursor: default;
  transition: background var(--transition-interactive);
  flex-shrink: 0;
}

.key-black {
  width: 18px;
  height: 48px;
  background: var(--color-text);
  border-radius: 0 0 3px 3px;
  position: absolute;
  z-index: 2;
  top: 0;
  cursor: default;
  transition: background var(--transition-interactive);
}

.key-white.highlighted {
  background: var(--color-accent-blue);
  border-color: var(--color-accent-blue);
}

.key-white.correct {
  background: var(--color-primary);
  border-color: var(--color-primary);
}

.key-black.highlighted {
  background: var(--color-accent-blue);
}

.key-black.correct {
  background: var(--color-primary);
}

.key-label {
  position: absolute;
  bottom: 4px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 9px;
  font-weight: 700;
  color: var(--color-text-muted);
  pointer-events: none;
}

/* Learn nav */
.learn-nav {
  display: flex;
  gap: var(--space-3);
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
}

.learn-counter {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-weight: 500;
}

/* ============================================
   TRAIN / TEST BLOCK
   ============================================ */

.quiz-block {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
}

.quiz-stats-row {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  width: 100%;
  margin-bottom: var(--space-4);
}

.quiz-trial-count {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  white-space: nowrap;
}

.quiz-accuracy {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-primary);
  white-space: nowrap;
}

.timer-bar {
  flex: 1;
  height: 6px;
  background: var(--color-surface-2);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.timer-bar-fill {
  height: 100%;
  background: var(--color-accent-blue);
  border-radius: var(--radius-full);
  transition: width 100ms linear, background 200ms;
}

.timer-bar-fill.warning {
  background: var(--color-error);
}

/* Play button */
.play-btn-wrapper {
  margin: var(--space-4) 0 var(--space-6);
  text-align: center;
}

.btn-play {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  background: var(--color-surface);
  border: 3px solid var(--color-border);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-interactive);
  box-shadow: var(--shadow-md);
  margin: 0 auto;
}

.btn-play:hover {
  border-color: var(--color-primary);
  transform: scale(1.05);
}

.btn-play:active {
  transform: scale(0.97);
}

.btn-play.playing {
  border-color: var(--color-primary);
  background: var(--color-primary-highlight);
}

.btn-play svg {
  color: var(--color-primary);
}

.btn-play-replay {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-2);
  font-weight: 500;
}

/* Answer grid */
.answer-grid {
  display: grid;
  gap: var(--space-3);
  width: 100%;
  margin-bottom: var(--space-4);
}

.answer-grid.small {
  grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
}

.answer-grid.medium {
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
}

.answer-grid.large {
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
}

.answer-btn {
  padding: var(--space-4) var(--space-3);
  border-radius: var(--radius-xl);
  border: 2px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-base);
  cursor: pointer;
  transition: all var(--transition-interactive);
  text-align: center;
  min-height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: var(--space-1);
}

.answer-btn:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-highlight);
  transform: translateY(-1px);
}

.answer-btn.selected {
  border-color: var(--color-accent-blue);
  background: color-mix(in oklab, var(--color-accent-blue) 12%, var(--color-surface));
  color: var(--color-accent-blue);
}

.answer-btn.correct {
  border-color: var(--color-primary);
  background: var(--color-primary-highlight);
  color: var(--color-primary);
  animation: correct-pulse 400ms ease;
}

.answer-btn.wrong {
  border-color: var(--color-error);
  background: var(--color-error-highlight);
  color: var(--color-error);
  animation: wrong-shake 300ms ease;
}

.answer-btn:disabled {
  cursor: not-allowed;
  opacity: 0.7;
}

.answer-btn-sub {
  font-size: var(--text-xs);
  font-weight: 400;
  color: var(--color-text-muted);
  font-family: var(--font-body);
}

@keyframes correct-pulse {
  0% { transform: scale(1); }
  40% { transform: scale(1.07); }
  100% { transform: scale(1); }
}

@keyframes wrong-shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-6px); }
  60% { transform: translateX(6px); }
}

/* XP float animation */
.xp-float {
  position: fixed;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--text-lg);
  color: var(--color-gold);
  pointer-events: none;
  z-index: 999;
  animation: xp-rise 1200ms cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes xp-rise {
  0% { opacity: 1; transform: translateY(0) scale(1); }
  60% { opacity: 1; transform: translateY(-40px) scale(1.2); }
  100% { opacity: 0; transform: translateY(-70px) scale(0.9); }
}

/* ============================================
   TEST SCORE SCREEN
   ============================================ */

.test-score-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-2xl);
  padding: var(--space-8);
  width: 100%;
  max-width: 480px;
}

.test-score-header {
  text-align: center;
  margin-bottom: var(--space-6);
}

.test-score-num {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--text-2xl);
  letter-spacing: -0.04em;
  color: var(--color-primary);
  display: block;
}

.test-score-label {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  font-weight: 500;
}

.test-breakdown {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
}

.test-breakdown-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-sm);
}

.test-breakdown-name {
  width: 48px;
  font-weight: 700;
  font-family: var(--font-display);
  color: var(--color-text);
  flex-shrink: 0;
  font-size: var(--text-xs);
}

.test-breakdown-bar {
  flex: 1;
  height: 8px;
  background: var(--color-surface-2);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.test-breakdown-fill {
  height: 100%;
  border-radius: var(--radius-full);
  transition: width 600ms cubic-bezier(0.16, 1, 0.3, 1);
}

.test-breakdown-fill.good { background: var(--color-primary); }
.test-breakdown-fill.ok { background: var(--color-gold); }
.test-breakdown-fill.poor { background: var(--color-error); }

.test-breakdown-pct {
  width: 36px;
  font-size: var(--text-xs);
  font-weight: 600;
  text-align: right;
  color: var(--color-text-muted);
}

/* ============================================
   DAY COMPLETE SCREEN
   ============================================ */

.day-complete {
  max-width: 480px;
  width: 100%;
  text-align: center;
}

.confetti-wrapper {
  position: relative;
  height: 60px;
  margin-bottom: var(--space-4);
  overflow: hidden;
}

.day-complete-icon {
  font-size: 3.5rem;
}

.day-complete-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--text-2xl);
  letter-spacing: -0.04em;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.day-complete-subtitle {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-8);
}

.day-complete-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}

.day-stat {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  text-align: center;
}

.day-stat-value {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-lg);
  color: var(--color-primary);
  display: block;
}

.day-stat-label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-weight: 500;
}

.block-scores-row {
  display: flex;
  gap: var(--space-3);
  justify-content: center;
  margin-bottom: var(--space-8);
}

.block-score {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-muted);
}

.block-score .score-val {
  color: var(--color-primary);
  font-family: var(--font-display);
}

/* ============================================
   PROGRESS PAGE
   ============================================ */

.progress-page-grid {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
  max-width: 680px;
  margin: 0 auto;
}

.stats-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
}

@media (min-width: 480px) {
  .stats-row {
    grid-template-columns: repeat(4, 1fr);
  }
}

.stat-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-5);
  text-align: center;
}

.stat-card-value {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-xl);
  letter-spacing: -0.03em;
  display: block;
  margin-bottom: var(--space-1);
}

.stat-card-label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-weight: 500;
}

.stat-card.green .stat-card-value { color: var(--color-primary); }
.stat-card.gold .stat-card-value { color: var(--color-gold); }
.stat-card.blue .stat-card-value { color: var(--color-accent-blue); }
.stat-card.purple .stat-card-value { color: var(--color-accent-purple); }

.accuracy-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
}

.accuracy-bars {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.accuracy-bar-row {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.accuracy-bar-name {
  width: 48px;
  font-size: var(--text-xs);
  font-weight: 700;
  font-family: var(--font-display);
  color: var(--color-text);
  flex-shrink: 0;
}

.accuracy-bar-track {
  flex: 1;
  height: 10px;
  background: var(--color-surface-2);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.accuracy-bar-fill {
  height: 100%;
  border-radius: var(--radius-full);
  transition: width 800ms cubic-bezier(0.16, 1, 0.3, 1);
}

.accuracy-bar-fill.high { background: var(--color-primary); }
.accuracy-bar-fill.mid { background: var(--color-gold); }
.accuracy-bar-fill.low { background: var(--color-error); }

.accuracy-bar-pct {
  width: 40px;
  font-size: var(--text-xs);
  font-weight: 600;
  text-align: right;
  color: var(--color-text-muted);
}

.history-table {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
}

.history-row {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-6);
  border-bottom: 1px solid var(--color-divider);
  font-size: var(--text-sm);
}

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

.history-row.header {
  background: var(--color-surface-2);
  font-weight: 600;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.history-day { width: 60px; font-weight: 700; color: var(--color-text); }
.history-phase { flex: 1; color: var(--color-text-muted); }
.history-acc { width: 60px; text-align: right; font-weight: 600; color: var(--color-primary); }
.history-xp { width: 60px; text-align: right; color: var(--color-gold); font-weight: 600; }

/* ============================================
   SETTINGS MODAL
   ============================================ */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-6);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-interactive);
}

.modal-overlay.open {
  opacity: 1;
  pointer-events: all;
}

.modal {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-2xl);
  padding: var(--space-8);
  max-width: 480px;
  width: 100%;
  box-shadow: var(--shadow-xl);
  transform: translateY(8px);
  transition: transform var(--transition-spring);
}

.modal-overlay.open .modal {
  transform: translateY(0);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-6);
}

.modal-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-lg);
  color: var(--color-text);
}

.modal-close {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  transition: all var(--transition-interactive);
}

.modal-close:hover {
  background: var(--color-surface-2);
  color: var(--color-text);
}

.modal-section {
  margin-bottom: var(--space-6);
}

.modal-section-title {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-3);
}

.modal-text {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: var(--space-3);
}

.modal-text a {
  color: var(--color-accent-blue);
  text-decoration: none;
}

.modal-text a:hover { text-decoration: underline; }

.btn-danger {
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-lg);
  background: var(--color-error-highlight);
  border: 1px solid var(--color-error);
  color: var(--color-error);
  font-weight: 600;
  font-size: var(--text-sm);
  cursor: pointer;
  transition: all var(--transition-interactive);
  font-family: var(--font-body);
}

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

.data-note {
  background: color-mix(in oklab, var(--color-gold) 12%, transparent);
  border: 1px solid color-mix(in oklab, var(--color-gold) 40%, transparent);
  border-radius: var(--radius-lg);
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}

/* ============================================
   CONFETTI
   ============================================ */

.confetti-piece {
  position: fixed;
  width: 10px;
  height: 10px;
  opacity: 0;
  pointer-events: none;
  z-index: 500;
  border-radius: 2px;
}

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 600px) {
  .nav {
    padding: var(--space-3) var(--space-4);
  }

  .nav-tabs {
    display: none;
  }

  .page {
    padding: var(--space-6) var(--space-4);
  }

  .session-wrapper {
    padding: var(--space-4);
    justify-content: flex-start;
    padding-top: var(--space-6);
  }

  .today-card {
    padding: var(--space-6);
  }

  .complete-stats {
    gap: var(--space-4);
  }

  .day-complete-stats {
    grid-template-columns: repeat(3, 1fr);
  }

  .nav-stat.day-badge {
    display: none;
  }
}

/* ============================================
   FOOTER
   ============================================ */

footer {
  text-align: center;
  padding: var(--space-6);
  border-top: 1px solid var(--color-border);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

footer a {
  color: var(--color-text-muted);
  text-decoration: none;
}

footer a:hover {
  color: var(--color-text);
}