/* ═══ TETA COMPONENTS ═══ */

/* ── Theta Logo ── */
.theta-logo-container {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.theta-logo-container svg {
  overflow: visible;
}

.tl-glow {
  position: absolute;
  width: 150%;
  height: 150%;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(120, 130, 255, 0.07) 0%, transparent 65%);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -55%);
  pointer-events: none;
  opacity: 0;
}

/* ── Buttons ── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 14px var(--space-lg);
  background: linear-gradient(135deg, var(--theta-400), var(--theta-300));
  color: white;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.5px;
  border-radius: var(--radius-lg);
  width: 100%;
  transition: opacity 0.15s, transform 0.1s;
}

.btn-primary:active {
  opacity: 0.85;
  transform: scale(0.98);
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 14px var(--space-lg);
  background: transparent;
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 400;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
  width: 100%;
  transition: opacity 0.15s, border-color 0.15s;
}

.btn-ghost:active {
  opacity: 0.7;
  border-color: var(--border-medium);
}

/* ── Number Display ── */
.number-display {
  font-family: var(--font-mono);
  font-size: 42px;
  font-weight: 300;
  letter-spacing: 8px;
  text-align: center;
  color: var(--text-primary);
  min-height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.1s;
}

.number-display.hidden {
  opacity: 0;
}

.number-display.correct {
  color: var(--correct);
  text-shadow: 0 0 20px var(--correct-glow);
}

.number-display.error {
  color: var(--error);
  text-decoration: line-through;
}

/* ── Input Display (underscore placeholders) ── */
.input-display {
  display: flex;
  justify-content: center;
  gap: 10px;
  min-height: 44px;
  align-items: flex-end;
}

.input-digit {
  width: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 300;
  color: var(--text-ghost);
  border-bottom: 2px solid var(--border-light);
  padding-bottom: 4px;
  transition: all 0.1s;
}

.input-digit.filled {
  color: var(--text-primary);
  border-bottom-color: var(--theta-400);
}

.input-digit.active {
  border-bottom-color: var(--theta-500);
}

/* ── Numpad ── */
.numpad {
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: 100%;
  max-width: 320px;
  margin: 0 auto;
}

.numpad-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.numpad-key {
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 300;
  color: var(--text-primary);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  transition: all 0.1s;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

.numpad-key:active {
  transform: scale(0.95);
  background: var(--theta-50);
}

.numpad-empty {
  visibility: hidden;
}

.numpad-delete {
  color: var(--text-tertiary);
}

.numpad-delete:active {
  color: var(--error);
}

.numpad-disabled {
  opacity: 0.4;
  pointer-events: none;
}

.numpad-container {
  width: 100%;
}

/* ── Countdown Display ── */
.countdown-display {
  font-family: var(--font-mono);
  font-size: 72px;
  font-weight: 200;
  color: var(--theta-500);
  text-align: center;
  display: none;
}

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

/* ── Per-digit Feedback ── */
.feedback-digits {
  font-family: var(--font-mono);
  font-size: 36px;
  font-weight: 300;
  letter-spacing: 6px;
  text-align: center;
  min-height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.digit-compare-ok {
  color: var(--text-primary);
}

.digit-compare-wrong {
  color: var(--error);
  text-decoration: line-through;
}

.digit-compare-correct {
  color: var(--correct);
  text-shadow: 0 0 20px var(--correct-glow);
}

/* ── Progress Bar ── */
.progress-bar {
  width: 100%;
  height: 3px;
  background: var(--border-subtle);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--theta-400), var(--theta-500));
  border-radius: var(--radius-full);
  transition: width 0.3s ease-out;
  width: 0%;
}

/* ── Timer ── */
.timer {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-tertiary);
  text-align: center;
  letter-spacing: 1px;
}

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

/* ── Stat Card ── */
.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  text-align: center;
}

.stat-card-value {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 400;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

.stat-card-label {
  font-size: 11px;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* ── Streak Badge Button ── */
.streak-badge-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: var(--theta-50);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 500;
  color: var(--theta-500);
  transition: all 0.15s;
  -webkit-tap-highlight-color: transparent;
}

.streak-badge-label {
  font-size: 11px;
  font-weight: 400;
  color: var(--theta-400);
  opacity: 0.7;
}

.streak-badge-btn:active {
  transform: scale(0.95);
  opacity: 0.8;
}

/* Invite pulse animation — until first tap */
.streak-badge-invite {
  position: relative;
  animation: streakBadgeScale 1.8s ease-in-out infinite;
}
.streak-badge-invite::after {
  content: '';
  position: absolute;
  inset: -3px;
  border-radius: var(--radius-full);
  border: 2px solid var(--theta-400);
  opacity: 0;
  animation: streakRingPulse 1.8s ease-out infinite;
  pointer-events: none;
}

@keyframes streakBadgeScale {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.12); }
}

@keyframes streakRingPulse {
  0% {
    opacity: 0.7;
    inset: -3px;
  }
  70% {
    opacity: 0;
    inset: -12px;
  }
  100% {
    opacity: 0;
    inset: -12px;
  }
}

/* ── Streak 1% Popup ── */
.streak-popup-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  opacity: 0;
  transition: opacity 0.2s;
  padding: var(--space-md);
}

.streak-popup-overlay.visible {
  opacity: 1;
}

.streak-popup-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl, 20px);
  padding: var(--space-xl) var(--space-lg) var(--space-lg);
  width: 100%;
  max-width: 340px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
  position: relative;
  transform: translateY(20px) scale(0.95);
  transition: transform 0.25s ease-out;
}

.streak-popup-overlay.visible .streak-popup-card {
  transform: translateY(0) scale(1);
}

.streak-popup-close {
  position: absolute;
  top: 12px;
  right: 12px;
  background: none;
  color: var(--text-ghost);
  padding: 4px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
}

.streak-popup-close:active {
  opacity: 0.5;
}

.streak-popup-hero {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.streak-popup-days {
  font-family: var(--font-mono);
  font-size: 56px;
  font-weight: 200;
  color: var(--theta-500);
  line-height: 1;
}

.streak-popup-days-label {
  font-size: 14px;
  color: var(--text-secondary);
  letter-spacing: 0.5px;
}

.streak-popup-subtitle {
  font-size: 13px;
  color: var(--text-tertiary);
  margin-bottom: var(--space-sm);
}

.streak-popup-compound {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  padding: var(--space-md) 0;
}

.streak-compound-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.streak-compound-meta {
  display: flex;
  justify-content: center;
}

.streak-compound-formula {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 500;
  letter-spacing: 1px;
}

.streak-compound-formula.streak-good {
  color: var(--correct);
}

.streak-compound-formula.streak-bad {
  color: var(--error);
}

.streak-compound-bar {
  width: 100%;
  height: 8px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.streak-compound-fill {
  height: 100%;
  border-radius: var(--radius-full);
  transition: width 0.8s cubic-bezier(0.16, 1, 0.3, 1);
  width: 0%;
}

.streak-compound-fill-good {
  background: linear-gradient(90deg, var(--correct), #34d399);
}

.streak-compound-fill-bad {
  background: var(--error);
}

.streak-compound-label {
  font-size: 12px;
  line-height: 1.3;
}

.streak-compound-label.streak-good {
  color: var(--correct);
}

.streak-compound-label.streak-bad {
  color: var(--text-ghost);
}

.streak-popup-daily {
  font-size: 12px;
  color: var(--text-ghost);
  font-style: italic;
  text-align: center;
}

.streak-popup-btn {
  margin-top: var(--space-xs);
}

/* ── Feedback Overlay ── */
.feedback-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.15s;
  z-index: 10;
}

.feedback-overlay.visible {
  opacity: 1;
}

.feedback-overlay.correct {
  background: radial-gradient(ellipse at center, var(--correct-bg) 0%, transparent 70%);
}

.feedback-overlay.error {
  background: radial-gradient(ellipse at center, var(--error-bg) 0%, transparent 70%);
}

.feedback-label {
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 2px;
}

.feedback-label.correct {
  color: var(--correct);
}

.feedback-label.error {
  color: var(--error);
}

.feedback-speed {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-tertiary);
}

.feedback-correct-answer {
  font-family: var(--font-mono);
  font-size: 24px;
  color: var(--text-primary);
  letter-spacing: 6px;
  margin-top: var(--space-sm);
}

/* ── Tab Bar ── */
.tab-bar {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  display: flex;
  justify-content: space-around;
  align-items: center;
  height: 60px;
  background: var(--bg-deep);
  border-top: 1px solid var(--border-subtle);
  z-index: 100;
  padding-bottom: env(safe-area-inset-bottom, 0);
  transform: translateY(100%);
  transition: transform 0.25s ease-out;
}

.tab-bar.visible {
  transform: translateY(0);
}

.tab-bar-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  padding: 8px 16px;
  color: var(--text-ghost);
  font-size: 10px;
  letter-spacing: 0.5px;
  transition: color 0.15s;
  -webkit-tap-highlight-color: transparent;
}

.tab-bar-item.active {
  color: var(--theta-500);
}

.tab-bar-item:active {
  opacity: 0.6;
}

.tab-bar-item svg {
  transition: transform 0.15s;
}

.tab-bar-item:active svg {
  transform: scale(0.9);
}

.tab-bar-start {
  color: var(--text-secondary);
}

.tab-bar-start svg {
  filter: drop-shadow(0 0 6px var(--theta-glow));
}

.tab-bar-start.active {
  color: var(--theta-400);
}

/* Invite pulse on play button — until first session */
.tab-bar-start-invite svg {
  animation: playGlow 2s ease-in-out infinite;
  filter: drop-shadow(0 0 8px var(--theta-400));
}

@keyframes playGlow {
  0%, 100% {
    filter: drop-shadow(0 0 4px var(--theta-400));
    transform: scale(1);
  }
  50% {
    filter: drop-shadow(0 0 14px var(--theta-400)) drop-shadow(0 0 24px rgba(99, 102, 241, 0.3));
    transform: scale(1.12);
  }
}

/* ── PRO Modal ── */
.pro-modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  opacity: 0;
  transition: opacity 0.2s;
  padding: var(--space-md);
}

.pro-modal-overlay.visible {
  opacity: 1;
}

.pro-modal-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl, 20px);
  padding: var(--space-xl) var(--space-lg);
  width: 100%;
  max-width: 340px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
  position: relative;
  transform: translateY(20px) scale(0.95);
  transition: transform 0.25s ease-out;
}

.pro-modal-overlay.visible .pro-modal-card {
  transform: translateY(0) scale(1);
}

.pro-modal-close {
  position: absolute;
  top: 12px;
  right: 12px;
  background: none;
  color: var(--text-ghost);
  padding: 4px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
}

.pro-modal-close:active {
  opacity: 0.5;
}

.pro-modal-icon {
  color: var(--theta-500);
  margin-bottom: var(--space-xs);
}

.pro-modal-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  text-align: center;
  letter-spacing: 0.5px;
}

.pro-modal-features {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  width: 100%;
  padding: var(--space-sm) 0;
}

.pro-modal-feature {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--text-secondary);
  font-size: 14px;
}

.pro-modal-feature svg {
  color: var(--theta-500);
  flex-shrink: 0;
}

.pro-modal-buy {
  margin-top: var(--space-sm);
}

.pro-modal-later {
  background: none;
  color: var(--text-ghost);
  font-size: 13px;
  padding: 8px;
}

.pro-modal-later:active {
  opacity: 0.5;
}

/* ── Swipe Slider ── */
.swipe-slider {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  width: 100%;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.swipe-slider-arrow {
  background: none;
  color: var(--text-ghost);
  padding: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.15s;
}

.swipe-slider-arrow:active {
  color: var(--theta-500);
}

.swipe-slider-arrow.disabled {
  opacity: 0.2;
  pointer-events: none;
}

.swipe-slider-track {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  min-height: 64px;
  justify-content: center;
}

.swipe-slider-item {
  font-family: var(--font-mono);
  text-align: center;
  transition: all 0.15s;
  line-height: 1.2;
}

.swipe-slider-prev,
.swipe-slider-next {
  font-size: 14px;
  color: var(--text-ghost);
  min-height: 18px;
}

.swipe-slider-current {
  font-size: 28px;
  font-weight: 400;
  color: var(--theta-500);
  min-height: 34px;
}