/* ==========================================================================
   NIHONGO BLITZ — DUOLINGO-STYLE TACTILE DESIGN SYSTEM
   Mobile-first, distraction-free Japanese micro-practice PWA
   ========================================================================== */

:root {
  /* Core Surfaces (Duolingo Dark / Slate Palette) */
  --bg-main: #131F24;
  --bg-elevated: #1B2B32;
  --bg-card-hover: #22363F;
  --bg-subtle: #16242A;
  --border-card: #37464F;
  --border-lip: #28373F;

  /* Text Hierarchy */
  --text-primary: #FFFFFF;
  --text-secondary: #AFBCC4;
  --text-muted: #778994;

  /* Tactile Brand Colors + 3D Bottom Lip Shades */
  --duo-green: #58CC02;
  --duo-green-lip: #46A302;
  --duo-green-bg: rgba(88, 204, 2, 0.14);

  --duo-blue: #1CB0F6;
  --duo-blue-lip: #1185BD;
  --duo-blue-bg: rgba(28, 176, 246, 0.15);

  --duo-red: #FF4B4B;
  --duo-red-lip: #CC3232;
  --duo-red-bg: rgba(255, 75, 75, 0.15);

  --duo-gold: #FFC800;
  --duo-gold-lip: #CCA000;
  --duo-gold-bg: rgba(255, 200, 0, 0.15);

  --duo-orange: #FF9600;
  --duo-orange-lip: #CC7800;
  --duo-orange-bg: rgba(255, 150, 0, 0.15);

  --duo-purple: #CE82FF;
  --duo-purple-lip: #A559D9;
  --duo-purple-bg: rgba(206, 130, 255, 0.15);

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
               'Hiragino Sans', 'Hiragino Kaku Gothic ProN', 'Noto Sans JP',
               'Yu Gothic UI', 'Meiryo', sans-serif;

  /* Layout */
  --max-width: 720px;
  --radius-sm: 12px;
  --radius-md: 16px;
  --radius-lg: 22px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

html, body {
  min-height: 100%;
  background-color: var(--bg-main);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.5;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

button, input, select, textarea {
  font-family: inherit;
  color: inherit;
}

.hidden {
  display: none !important;
}

/* ==========================================================================
   FULL-SCREEN FLASH FEEDBACK OVERLAY
   ========================================================================== */
.screen-flash {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 950;
  opacity: 0;
  transition: opacity 0.25s ease;
}

.screen-flash.flash-correct {
  background: radial-gradient(circle at center, rgba(88, 204, 2, 0.22) 0%, rgba(88, 204, 2, 0.04) 70%, transparent 100%);
  animation: screenFlashPulse 0.55s ease-out forwards;
}

.screen-flash.flash-wrong {
  background: radial-gradient(circle at center, rgba(255, 75, 75, 0.26) 0%, rgba(255, 75, 75, 0.05) 70%, transparent 100%);
  animation: screenFlashPulse 0.55s ease-out forwards;
}

@keyframes screenFlashPulse {
  0% { opacity: 1; }
  100% { opacity: 0; }
}

/* ==========================================================================
   TOP NAVIGATION BAR
   ========================================================================== */
.top-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(19, 31, 36, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 2px solid var(--border-card);
}

.top-nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 12px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.brand-group {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  user-select: none;
}

.brand-logo {
  width: 38px;
  height: 38px;
  border-radius: 11px;
  background: linear-gradient(135deg, #58CC02, #2B8A00);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 1.35rem;
  color: #fff;
  box-shadow: 0 3px 0 #1E6300;
  flex-shrink: 0;
}

.brand-title {
  font-weight: 800;
  font-size: 1.1rem;
  letter-spacing: -0.02em;
  line-height: 1.15;
}

.brand-subtitle {
  font-size: 0.72rem;
  color: var(--text-secondary);
  font-weight: 600;
  display: block;
}

.nav-stats {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: nowrap;
}

.stat-pill {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 6px 11px;
  border-radius: 999px;
  background: var(--bg-elevated);
  border: 2px solid var(--border-card);
  font-weight: 800;
  font-size: 0.88rem;
  user-select: none;
  white-space: nowrap;
}

.stat-pill.streak-pill {
  color: var(--duo-orange);
  border-color: rgba(255, 150, 0, 0.35);
  background: rgba(255, 150, 0, 0.1);
}

.stat-pill.streak-pill.streak-active .streak-flame {
  display: inline-block;
  animation: flameBounce 1.8s infinite ease-in-out;
}

.stat-pill.xp-pill {
  color: var(--duo-gold);
  border-color: rgba(255, 200, 0, 0.35);
  background: rgba(255, 200, 0, 0.1);
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  height: 38px;
  padding: 0 12px;
  border-radius: 12px;
  background: var(--bg-elevated);
  border: 2px solid var(--border-card);
  border-bottom-width: 4px;
  font-weight: 700;
  font-size: 0.85rem;
  cursor: pointer;
  transition: transform 0.08s ease, border-bottom-width 0.08s ease, background 0.15s ease;
}

.icon-btn:hover {
  background: var(--bg-card-hover);
}

.icon-btn:active {
  transform: translateY(2px);
  border-bottom-width: 2px;
}

/* ==========================================================================
   HABITGATE MODE BANNER
   ========================================================================== */
.habitgate-banner {
  background: linear-gradient(90deg, rgba(28, 176, 246, 0.18), rgba(88, 204, 2, 0.18));
  border-bottom: 2px solid rgba(28, 176, 246, 0.4);
  padding: 8px 16px;
  text-align: center;
  font-size: 0.85rem;
  font-weight: 700;
  color: #E2F6FF;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.habitgate-badge {
  background: var(--duo-blue);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 800;
  padding: 2px 8px;
  border-radius: 99px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* ==========================================================================
   MAIN CONTAINER & DASHBOARD VIEW
   ========================================================================== */
.app-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 20px 16px 64px;
}

/* Hero Quick Start Card */
.hero-card {
  background: linear-gradient(135deg, #1E3540 0%, #172830 100%);
  border: 2px solid #2D4B5A;
  border-bottom-width: 5px;
  border-radius: var(--radius-lg);
  padding: 22px 20px;
  margin-bottom: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  position: relative;
  overflow: hidden;
}

.hero-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
}

.hero-title {
  font-size: 1.4rem;
  font-weight: 900;
  letter-spacing: -0.02em;
  margin-bottom: 4px;
}

.hero-desc {
  color: var(--text-secondary);
  font-size: 0.92rem;
}

.hero-controls-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-top: 8px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.length-selector {
  display: inline-flex;
  background: var(--bg-main);
  padding: 4px;
  border-radius: 12px;
  border: 2px solid var(--border-card);
  gap: 4px;
}

.length-btn {
  border: none;
  background: transparent;
  color: var(--text-secondary);
  padding: 7px 13px;
  border-radius: 8px;
  font-weight: 800;
  font-size: 0.82rem;
  cursor: pointer;
  transition: all 0.15s ease;
}

.length-btn.active {
  background: var(--duo-blue);
  color: #fff;
  box-shadow: 0 2px 0 var(--duo-blue-lip);
}

.length-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

/* Tactile 3D Primary / Secondary Buttons */
.btn-3d {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 22px;
  border-radius: var(--radius-md);
  font-weight: 800;
  font-size: 0.98rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  cursor: pointer;
  border: 2px solid transparent;
  border-bottom-width: 5px;
  transition: transform 0.08s ease, border-bottom-width 0.08s ease, filter 0.15s ease;
  user-select: none;
  text-decoration: none;
}

.btn-3d:hover {
  filter: brightness(1.06);
}

.btn-3d:active {
  transform: translateY(3px);
  border-bottom-width: 2px;
}

.btn-green {
  background: var(--duo-green);
  border-color: var(--duo-green-lip);
  color: #FFFFFF;
}

.btn-blue {
  background: var(--duo-blue);
  border-color: var(--duo-blue-lip);
  color: #FFFFFF;
}

.btn-gold {
  background: var(--duo-gold);
  border-color: var(--duo-gold-lip);
  color: #131F24;
}

.btn-purple {
  background: var(--duo-purple);
  border-color: var(--duo-purple-lip);
  color: #131F24;
}

.btn-red {
  background: var(--duo-red);
  border-color: var(--duo-red-lip);
  color: #FFFFFF;
}

.btn-outline {
  background: var(--bg-elevated);
  border-color: var(--border-card);
  color: var(--text-primary);
}

/* ==========================================================================
   SPACED REPETITION / WEAKNESS BANK BANNER CARD
   ========================================================================== */
.weakness-card {
  background: var(--bg-elevated);
  border: 2px solid var(--border-card);
  border-bottom-width: 5px;
  border-radius: var(--radius-md);
  padding: 16px 18px;
  margin-bottom: 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
}

.weakness-card.has-weaknesses {
  border-color: var(--duo-orange);
  background: linear-gradient(90deg, rgba(255, 150, 0, 0.12) 0%, var(--bg-elevated) 100%);
}

.weakness-info {
  display: flex;
  align-items: center;
  gap: 13px;
  flex: 1;
  min-width: 210px;
}

.weakness-icon {
  width: 46px;
  height: 46px;
  border-radius: 13px;
  background: var(--duo-orange-bg);
  border: 2px solid rgba(255, 150, 0, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  flex-shrink: 0;
}

.weakness-title {
  font-weight: 800;
  font-size: 1rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

.weakness-count-badge {
  background: var(--duo-orange);
  color: #131F24;
  font-size: 0.76rem;
  font-weight: 900;
  padding: 2px 8px;
  border-radius: 99px;
}

.weakness-sub {
  font-size: 0.84rem;
  color: var(--text-secondary);
  margin-top: 2px;
}

/* ==========================================================================
   DIFFICULTY FILTER PILLS & SECTION HEADERS
   ========================================================================== */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}

.section-title {
  font-size: 1.12rem;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.level-filters {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.filter-chip {
  background: var(--bg-elevated);
  border: 2px solid var(--border-card);
  color: var(--text-secondary);
  padding: 5px 12px;
  border-radius: 99px;
  font-size: 0.78rem;
  font-weight: 800;
  cursor: pointer;
  transition: all 0.15s ease;
}

.filter-chip:hover {
  border-color: var(--duo-blue);
  color: var(--text-primary);
}

.filter-chip.active {
  background: var(--duo-blue-bg);
  border-color: var(--duo-blue);
  color: var(--duo-blue);
}

/* ==========================================================================
   CATEGORY GRID CARDS
   ========================================================================== */
.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(295px, 1fr));
  gap: 14px;
}

.category-card {
  background: var(--bg-elevated);
  border: 2px solid var(--border-card);
  border-bottom-width: 5px;
  border-radius: var(--radius-md);
  padding: 18px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 14px;
  transition: transform 0.12s ease, border-color 0.15s ease, background 0.15s ease;
  cursor: pointer;
}

.category-card:hover {
  border-color: var(--duo-blue);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
}

.category-card:active {
  transform: translateY(2px);
  border-bottom-width: 2px;
}

.cat-header {
  display: flex;
  align-items: flex-start;
  gap: 13px;
}

.cat-icon {
  width: 50px;
  height: 50px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 900;
  flex-shrink: 0;
  border: 2px solid rgba(255, 255, 255, 0.12);
}

.cat-meta {
  flex: 1;
}

.cat-badges {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 4px;
}

.level-tag {
  font-size: 0.7rem;
  font-weight: 900;
  padding: 2px 7px;
  border-radius: 6px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.level-N5 { background: rgba(88, 204, 2, 0.18); color: #78E822; }
.level-N4 { background: rgba(28, 176, 246, 0.18); color: #49C5FF; }
.level-N3 { background: rgba(206, 130, 255, 0.2); color: #DDA4FF; }
.level-N2 { background: rgba(255, 150, 0, 0.2); color: #FFB443; }

.cat-count-tag {
  font-size: 0.73rem;
  color: var(--text-muted);
  font-weight: 700;
}

.cat-title {
  font-size: 1.04rem;
  font-weight: 800;
  line-height: 1.25;
}

.cat-desc {
  font-size: 0.84rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

.cat-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-top: 6px;
}

.cat-progress-wrap {
  flex: 1;
}

.cat-progress-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-secondary);
  margin-bottom: 5px;
}

.cat-progress-track {
  height: 9px;
  background: var(--bg-main);
  border-radius: 99px;
  overflow: hidden;
}

.cat-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--duo-green), #89E219);
  border-radius: 99px;
  transition: width 0.35s ease;
}

.cat-start-pill {
  padding: 8px 14px;
  border-radius: 11px;
  background: var(--duo-blue);
  box-shadow: 0 3px 0 var(--duo-blue-lip);
  color: #fff;
  font-weight: 800;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  flex-shrink: 0;
}

/* ==========================================================================
   ACTIVE DRILL VIEW (SESSION SCREEN)
   ========================================================================== */
.drill-view {
  min-height: calc(100vh - 80px);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding-bottom: 130px; /* space for feedback sheet */
}

/* Progress Header */
.drill-top-bar {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 24px;
}

.close-drill-btn {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: transparent;
  border: 2px solid var(--border-card);
  color: var(--text-secondary);
  font-size: 1.2rem;
  font-weight: 800;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all 0.15s ease;
}

.close-drill-btn:hover {
  background: var(--bg-elevated);
  color: var(--text-primary);
}

.progress-track {
  flex: 1;
  height: 16px;
  background: var(--bg-elevated);
  border-radius: 99px;
  overflow: hidden;
  position: relative;
  border: 2px solid var(--border-card);
}

.progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, #58CC02, #78E822);
  border-radius: 99px;
  transition: width 0.38s cubic-bezier(0.34, 1.56, 0.64, 1);
  position: relative;
}

/* Duolingo-style glossy highlight bar inside progress fill */
.progress-fill::after {
  content: '';
  position: absolute;
  top: 3px;
  left: 8px;
  right: 8px;
  height: 3px;
  background: rgba(255, 255, 255, 0.35);
  border-radius: 99px;
}

.progress-counter {
  font-weight: 800;
  font-size: 0.9rem;
  color: var(--text-secondary);
  min-width: 44px;
  text-align: right;
}

.combo-pill {
  background: var(--duo-gold-bg);
  border: 2px solid var(--duo-gold);
  color: var(--duo-gold);
  font-weight: 900;
  font-size: 0.78rem;
  padding: 4px 10px;
  border-radius: 99px;
  animation: popIn 0.25s ease;
}

/* Question Prompt Card */
.question-card {
  background: var(--bg-elevated);
  border: 2px solid var(--border-card);
  border-bottom-width: 5px;
  border-radius: var(--radius-lg);
  padding: 26px 22px;
  margin-bottom: 22px;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.question-card.card-correct {
  border-color: var(--duo-green);
  background: linear-gradient(180deg, rgba(88, 204, 2, 0.14), var(--bg-elevated));
  animation: correctPop 0.38s ease;
}

.question-card.card-wrong {
  border-color: var(--duo-red);
  background: linear-gradient(180deg, rgba(255, 75, 75, 0.14), var(--bg-elevated));
  animation: wrongShake 0.42s ease;
}

.question-tags-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}

.question-cat-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  font-weight: 800;
  color: var(--duo-blue);
  background: var(--duo-blue-bg);
  padding: 4px 11px;
  border-radius: 99px;
}

.weakness-review-tag {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.75rem;
  font-weight: 800;
  color: var(--duo-orange);
  background: var(--duo-orange-bg);
  border: 1px solid rgba(255, 150, 0, 0.45);
  padding: 4px 10px;
  border-radius: 99px;
}

.question-prompt {
  font-size: 1.35rem;
  font-weight: 800;
  line-height: 1.45;
  color: var(--text-primary);
  word-break: break-word;
}

/* Highlight Japanese script inside questions for extra legibility */
.jp-highlight {
  display: inline-block;
  color: #72D6FF;
  font-size: 1.14em;
  font-weight: 900;
  padding: 0 3px;
}

/* Big Tap-Friendly Option Buttons */
.options-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

@media (min-width: 560px) {
  .options-grid {
    grid-template-columns: 1fr 1fr;
    gap: 14px;
  }
}

.option-btn {
  min-height: 68px;
  padding: 15px 18px;
  border-radius: var(--radius-md);
  background: var(--bg-elevated);
  border: 2px solid var(--border-card);
  border-bottom-width: 5px;
  color: var(--text-primary);
  font-size: 1.06rem;
  font-weight: 700;
  text-align: left;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  cursor: pointer;
  transition: transform 0.08s ease, border-bottom-width 0.08s ease, border-color 0.15s ease, background 0.15s ease;
  user-select: none;
}

.option-btn:hover:not(:disabled) {
  background: var(--bg-card-hover);
  border-color: var(--duo-blue);
}

.option-btn:active:not(:disabled) {
  transform: translateY(3px);
  border-bottom-width: 2px;
}

.option-key-hint {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  border: 2px solid var(--border-card);
  color: var(--text-muted);
  font-size: 0.8rem;
  font-weight: 800;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.option-text {
  flex: 1;
  line-height: 1.35;
}

/* Option Feedback States */
.option-btn.correct-choice {
  background: rgba(88, 204, 2, 0.2) !important;
  border-color: var(--duo-green) !important;
  border-bottom-color: var(--duo-green-lip) !important;
  color: #99F747 !important;
  animation: correctPop 0.35s ease;
}

.option-btn.correct-choice .option-key-hint {
  background: var(--duo-green);
  border-color: var(--duo-green);
  color: #131F24;
}

.option-btn.wrong-choice {
  background: rgba(255, 75, 75, 0.2) !important;
  border-color: var(--duo-red) !important;
  border-bottom-color: var(--duo-red-lip) !important;
  color: #FF8E8E !important;
  animation: wrongShake 0.4s ease;
}

.option-btn.wrong-choice .option-key-hint {
  background: var(--duo-red);
  border-color: var(--duo-red);
  color: #FFFFFF;
}

.option-btn.dimmed-choice {
  opacity: 0.48;
  cursor: default;
}

/* ==========================================================================
   BOTTOM SLIDE-UP FEEDBACK SHEET
   ========================================================================== */
.feedback-sheet {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 300;
  background: #1B2B32;
  border-top: 3px solid var(--border-card);
  padding: 18px 16px 22px;
  transform: translateY(110%);
  transition: transform 0.24s cubic-bezier(0.22, 1, 0.36, 1);
  box-shadow: 0 -10px 30px rgba(0, 0, 0, 0.45);
}

.feedback-sheet.visible {
  transform: translateY(0);
}

.feedback-sheet.sheet-correct {
  background: #142E1B;
  border-top-color: var(--duo-green);
}

.feedback-sheet.sheet-wrong {
  background: #2F181D;
  border-top-color: var(--duo-red);
}

.feedback-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.feedback-content {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  flex: 1;
  min-width: 240px;
}

.feedback-status-icon {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.35rem;
  font-weight: 900;
  flex-shrink: 0;
}

.sheet-correct .feedback-status-icon {
  background: var(--duo-green);
  color: #131F24;
}

.sheet-wrong .feedback-status-icon {
  background: var(--duo-red);
  color: #FFFFFF;
}

.feedback-headline {
  font-size: 1.12rem;
  font-weight: 900;
  margin-bottom: 3px;
}

.sheet-correct .feedback-headline {
  color: #89E219;
}

.sheet-wrong .feedback-headline {
  color: #FF7878;
}

.feedback-explanation {
  font-size: 0.92rem;
  color: #E3EDF2;
  line-height: 1.4;
}

.feedback-srs-note {
  display: inline-block;
  margin-top: 6px;
  font-size: 0.76rem;
  font-weight: 800;
  padding: 2px 8px;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.1);
  color: var(--duo-gold);
}

.feedback-next-btn {
  min-width: 155px;
}

@media (max-width: 520px) {
  .feedback-next-btn {
    width: 100%;
  }
}

/* ==========================================================================
   SESSION COMPLETION & HABITGATE UNLOCK SCREEN
   ========================================================================== */
.complete-view {
  text-align: center;
  padding: 18px 4px 40px;
  animation: popIn 0.35s ease;
}

.complete-badge-icon {
  width: 92px;
  height: 92px;
  margin: 0 auto 16px;
  border-radius: 28px;
  background: linear-gradient(135deg, var(--duo-gold), #FF9600);
  box-shadow: 0 6px 0 #CC7800;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.9rem;
  animation: correctPop 0.55s ease;
}

.complete-title {
  font-size: 1.85rem;
  font-weight: 900;
  letter-spacing: -0.02em;
  margin-bottom: 6px;
}

.complete-subtitle {
  color: var(--text-secondary);
  font-size: 1rem;
  margin-bottom: 24px;
}

/* HabitGate Unlock Box */
.habitgate-unlock-box {
  background: linear-gradient(135deg, rgba(88, 204, 2, 0.2), rgba(28, 176, 246, 0.18));
  border: 2px solid var(--duo-green);
  border-bottom-width: 5px;
  border-radius: var(--radius-lg);
  padding: 22px 20px;
  margin: 0 auto 24px;
  max-width: 540px;
}

.unlock-pill {
  display: inline-block;
  background: var(--duo-green);
  color: #131F24;
  font-weight: 900;
  font-size: 0.78rem;
  padding: 4px 12px;
  border-radius: 99px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 10px;
}

.unlock-headline {
  font-size: 1.5rem;
  font-weight: 900;
  color: #99F747;
  margin-bottom: 6px;
}

.unlock-desc {
  color: #D9F2E0;
  font-size: 0.94rem;
  margin-bottom: 18px;
}

/* Summary Stat Cards Grid */
.summary-stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  max-width: 540px;
  margin: 0 auto 22px;
}

.summary-stat-card {
  background: var(--bg-elevated);
  border: 2px solid var(--border-card);
  border-bottom-width: 4px;
  border-radius: var(--radius-md);
  overflow: hidden;
}

.summary-stat-card.stat-xp { border-color: var(--duo-gold); }
.summary-stat-card.stat-acc { border-color: var(--duo-green); }
.summary-stat-card.stat-streak { border-color: var(--duo-orange); }

.summary-stat-header {
  padding: 6px 8px;
  font-size: 0.72rem;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: #131F24;
}

.stat-xp .summary-stat-header { background: var(--duo-gold); }
.stat-acc .summary-stat-header { background: var(--duo-green); }
.stat-streak .summary-stat-header { background: var(--duo-orange); }

.summary-stat-value {
  padding: 14px 8px;
  font-size: 1.45rem;
  font-weight: 900;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
}

.stat-xp .summary-stat-value { color: var(--duo-gold); }
.stat-acc .summary-stat-value { color: var(--duo-green); }
.stat-streak .summary-stat-value { color: var(--duo-orange); }

.srs-summary-banner {
  max-width: 540px;
  margin: 0 auto 24px;
  padding: 13px 16px;
  border-radius: var(--radius-md);
  background: var(--bg-elevated);
  border: 2px solid var(--border-card);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-secondary);
}

.complete-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  max-width: 540px;
  margin: 0 auto;
}

.complete-actions .btn-3d {
  flex: 1;
  min-width: 200px;
}

/* ==========================================================================
   CURRICULUM MANAGER MODAL (PROGRESSION & CUSTOM PACKS)
   ========================================================================== */
.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 500;
  background: rgba(10, 18, 22, 0.82);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.modal-card {
  width: 100%;
  max-width: 620px;
  max-height: 90vh;
  overflow-y: auto;
  background: var(--bg-elevated);
  border: 2px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 22px 20px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 14px;
  border-bottom: 2px solid var(--border-card);
  margin-bottom: 16px;
}

.modal-title {
  font-size: 1.2rem;
  font-weight: 900;
}

.modal-section {
  background: var(--bg-main);
  border: 2px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 16px;
  margin-bottom: 16px;
}

.modal-section h4 {
  font-size: 0.98rem;
  font-weight: 800;
  margin-bottom: 6px;
  color: var(--duo-blue);
}

.modal-section p {
  font-size: 0.84rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.form-grid {
  display: grid;
  gap: 10px;
}

.form-row-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.input-field {
  width: 100%;
  padding: 10px 12px;
  border-radius: 10px;
  background: var(--bg-elevated);
  border: 2px solid var(--border-card);
  color: var(--text-primary);
  font-size: 0.9rem;
  font-weight: 600;
}

.input-field:focus {
  outline: none;
  border-color: var(--duo-blue);
}

.status-toast {
  margin-top: 10px;
  padding: 10px 12px;
  border-radius: 10px;
  font-size: 0.85rem;
  font-weight: 700;
}

.status-toast.success {
  background: var(--duo-green-bg);
  color: #89E219;
  border: 1px solid var(--duo-green);
}

.status-toast.error {
  background: var(--duo-red-bg);
  color: #FF8E8E;
  border: 1px solid var(--duo-red);
}

/* ==========================================================================
   KEYFRAME ANIMATIONS
   ========================================================================== */
@keyframes correctPop {
  0% { transform: scale(1); }
  40% { transform: scale(1.035); }
  100% { transform: scale(1); }
}

@keyframes wrongShake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-8px); }
  40% { transform: translateX(8px); }
  60% { transform: translateX(-6px); }
  80% { transform: translateX(5px); }
}

@keyframes flameBounce {
  0%, 100% { transform: scale(1) rotate(0deg); }
  50% { transform: scale(1.18) rotate(-5deg); }
}

@keyframes popIn {
  0% { opacity: 0; transform: translateY(10px) scale(0.97); }
  100% { opacity: 1; transform: translateY(0) scale(1); }
}