/* ==========================================================================
   METAMI Learning OS — Premium Digital Interactive Stylesheet (RC4)
   Compliant with Visual System Specification v1, Fluid Typography &
   Child-First Responsive UX Standards (Tested 320px – 1440px+)
   ========================================================================== */

:root {
  /* Brand Palette */
  --color-primary: #1F4E5B;
  --color-primary-dark: #153842;
  --color-primary-light: #EAF4F3;
  --color-primary-subtle: #F2F8F7;
  
  --color-coral: #E06D53;
  --color-coral-dark: #B84A32;
  --color-coral-light: #FDEEEB;
  
  --color-yellow: #F4B236;
  --color-yellow-dark: #D99110;
  --color-yellow-light: #FFF8E7;
  --color-yellow-tint: #FFF4D6;
  
  --color-bg: #FFFDF8;
  --color-surface: #FFFFFF;
  --color-card-bg: #F4F9F8;
  --color-card-border: #DCECE9;
  
  --color-text-main: #222A29;
  --color-text-body: #2C3333;
  --color-text-muted: #5F7573;
  --color-line-stroke: #7A8C89;
  
  /* Typography Authority */
  --font-family-heading: 'Mitr', 'Thonburi', Tahoma, sans-serif;
  --font-family-body: 'IBM Plex Sans Thai Looped', 'Leelawadee UI', Tahoma, sans-serif;
  
  /* Fluid Typography Scale (Continuous Clamp) */
  --font-size-title: clamp(24px, 4.5vw, 34px);
  --font-size-passage-title: clamp(17px, 2.6vw, 20px);
  --font-size-passage: clamp(19px, 2.2vw, 22px);
  --font-size-question: clamp(18px, 2.1vw, 21px);
  --font-size-instruction: clamp(15.5px, 1.8vw, 17.5px);
  --font-size-body: clamp(15px, 1.7vw, 17px);
  --font-size-ui: clamp(14px, 1.5vw, 15px);
  --font-size-badge: clamp(12.5px, 1.3vw, 14px);
  
  /* Thai Line Heights (Carefully Tuned to Prevent Upper/Lower Tone Mark Clipping) */
  --line-height-thai: 1.8;
  --line-height-heading: 1.35;
  
  /* Layout & Spacing */
  --reading-max-width: 680px;
  --touch-target-min: 48px;
  --radius-xs: 6px;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 22px;
  --radius-pill: 9999px;
  
  --shadow-subtle: 0 2px 8px rgba(31, 78, 91, 0.04);
  --shadow-card: 0 6px 20px rgba(31, 78, 91, 0.06);
  --shadow-float: 0 10px 30px rgba(31, 78, 91, 0.12);
}

/* ==========================================================================
   Global Reset & Fluid Base
   ========================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

html, body {
  width: 100%;
  max-width: 100%;
  overflow-x: hidden;
  min-height: 100vh;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text-main);
  font-family: var(--font-family-body);
  font-size: var(--font-size-body);
  line-height: var(--line-height-thai);
  display: flex;
  flex-direction: column;
  overflow-wrap: break-word;
  word-break: break-word;
}

img, svg, canvas {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Base Icon Styling */
.icon-svg {
  display: inline-block;
  vertical-align: middle;
  flex-shrink: 0;
}

/* ==========================================================================
   Header & Utility Controls
   ========================================================================== */
.app-header {
  background: var(--color-surface);
  border-bottom: 1.5px solid var(--color-primary-light);
  padding: 10px clamp(12px, 3vw, 24px);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-subtle);
  width: 100%;
}

.brand-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  min-width: 0;
}

.brand-dots {
  display: flex;
  gap: 4px;
  flex-shrink: 0;
}

.brand-dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
}
.dot-coral { background-color: var(--color-coral); }
.dot-yellow { background-color: var(--color-yellow); }
.dot-teal { background-color: var(--color-primary); }

.brand-title {
  font-family: var(--font-family-heading);
  font-size: clamp(15px, 2.5vw, 19px);
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.3px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

/* Utility Header Button (Voice Settings) */
.btn-header-utility {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-card-border);
  background: var(--color-surface);
  color: var(--color-primary);
  font-family: var(--font-family-heading);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  min-height: 44px;
  min-width: 44px;
  transition: all 0.2s ease;
}

.btn-header-utility:hover {
  background: var(--color-primary-light);
  border-color: var(--color-primary);
}

/* Parent Facilitation Toggle Button */
.mode-toggle-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  border: 1.5px solid var(--color-primary);
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-family: var(--font-family-heading);
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
  min-height: 44px;
  min-width: 44px;
  transition: all 0.2s ease;
}

.mode-toggle-btn:hover {
  background: #DCEDE9;
}

.mode-toggle-btn.parent-mode-active {
  background: var(--color-coral);
  border-color: var(--color-coral);
  color: #FFFFFF;
}

/* ==========================================================================
   Voice Settings Dialog Modal
   ========================================================================== */
.modal-dialog {
  border: none;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-float);
  padding: 0;
  max-width: 480px;
  width: 90%;
  margin: auto;
  background: var(--color-surface);
}

.modal-dialog::backdrop {
  background: rgba(31, 78, 91, 0.4);
  backdrop-filter: blur(2px);
}

.modal-content {
  padding: clamp(16px, 4vw, 24px);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1.5px solid var(--color-primary-light);
  padding-bottom: 12px;
}

.modal-title {
  font-family: var(--font-family-heading);
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary);
}

.btn-close-modal {
  background: transparent;
  border: none;
  font-size: 20px;
  font-weight: bold;
  color: var(--color-text-muted);
  cursor: pointer;
  padding: 6px 10px;
  min-width: 44px;
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-xs);
}

.btn-close-modal:hover {
  color: var(--color-coral);
  background: var(--color-coral-light);
}

.modal-desc {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-label {
  font-family: var(--font-family-heading);
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
}

.select-voice {
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--color-card-border);
  font-family: var(--font-family-body);
  font-size: 15px;
  color: var(--color-text-main);
  background: var(--color-surface);
  outline: none;
  min-height: var(--touch-target-min);
  width: 100%;
}

.select-voice:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(31, 78, 91, 0.12);
}

.btn-sample-voice {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-card-border);
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-family: var(--font-family-heading);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  min-height: var(--touch-target-min);
  transition: all 0.2s ease;
}

.btn-sample-voice:hover {
  background: #D5ECE9;
  border-color: var(--color-primary);
}

/* ==========================================================================
   Main Layout & Work Area
   ========================================================================== */
.main-container {
  flex: 1;
  max-width: 860px;
  width: 100%;
  margin: 0 auto;
  padding: clamp(12px, 3vw, 24px) clamp(10px, 3vw, 20px);
  display: flex;
  flex-direction: column;
  gap: clamp(14px, 2.5vw, 20px);
}

/* Parent Facilitation Collapsible Drawer */
.parent-mode-panel {
  background: var(--color-surface);
  border: 1.5px solid var(--color-coral);
  border-radius: var(--radius-md);
  padding: clamp(14px, 3vw, 20px) clamp(12px, 3vw, 22px);
  display: none;
  flex-direction: column;
  gap: 14px;
  box-shadow: var(--shadow-subtle);
  animation: slideDown 0.25s ease;
  width: 100%;
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

.parent-mode-panel.active {
  display: flex;
}

.parent-panel-title {
  font-family: var(--font-family-heading);
  font-size: 16px;
  font-weight: 700;
  color: var(--color-coral);
  display: flex;
  align-items: center;
  gap: 8px;
}

.parent-hint-box {
  background: var(--color-yellow-light);
  border-left: 4px solid var(--color-yellow);
  padding: 10px 14px;
  border-radius: var(--radius-xs);
  font-size: 14.5px;
  color: var(--color-primary);
  font-weight: 500;
  line-height: 1.6;
}

.parent-notes-wrap {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.parent-notes-label {
  font-family: var(--font-family-heading);
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-muted);
}

.obs-notes-input {
  width: 100%;
  padding: 10px 14px;
  border: 1.5px solid var(--color-card-border);
  border-radius: var(--radius-sm);
  font-family: var(--font-family-body);
  font-size: 15px;
  line-height: 1.6;
  resize: vertical;
  min-height: 64px;
  outline: none;
  background: var(--color-surface);
}

.obs-notes-input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(31, 78, 91, 0.1);
}

.parent-actions-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.btn-primary-summary, .btn-share-summary, .btn-copy-summary, .btn-export-evidence {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-family: var(--font-family-heading);
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
  min-height: var(--touch-target-min);
  transition: all 0.2s ease;
}

.btn-primary-summary {
  background: var(--color-primary);
  color: #FFFFFF;
  border: none;
}
.btn-primary-summary:hover {
  background: var(--color-primary-dark);
}

.btn-share-summary {
  background: var(--color-yellow);
  color: var(--color-primary);
  border: none;
}
.btn-share-summary:hover {
  background: #EAA023;
}

.btn-copy-summary {
  background: var(--color-primary-light);
  color: var(--color-primary);
  border: 1px solid var(--color-card-border);
}
.btn-copy-summary:hover {
  background: #D5ECE9;
}

.btn-export-evidence {
  background: var(--color-surface);
  color: var(--color-text-muted);
  border: 1.5px solid var(--color-card-border);
}
.btn-export-evidence:hover {
  background: var(--color-primary-subtle);
  color: var(--color-primary);
}

/* ==========================================================================
   Navigation & Progress Bar (Responsive Auto-Fit)
   ========================================================================== */
.progress-bar-container {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  padding: 10px 14px;
  border: 1px solid var(--color-card-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  box-shadow: var(--shadow-subtle);
  width: 100%;
  flex-wrap: wrap;
}

.nav-progress-badge {
  font-family: var(--font-family-heading);
  font-size: 13.5px;
  font-weight: 700;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  white-space: nowrap;
  flex-shrink: 0;
}

.nav-select-wrap {
  flex: 1;
  min-width: 180px;
  max-width: 360px;
}

.nav-page-select {
  width: 100%;
  padding: 8px 12px;
  border: 1.5px solid var(--color-card-border);
  border-radius: var(--radius-sm);
  font-family: var(--font-family-heading);
  font-size: 14px;
  color: var(--color-primary);
  background: var(--color-surface);
  min-height: var(--touch-target-min);
  cursor: pointer;
  outline: none;
}

.nav-page-select:focus {
  border-color: var(--color-primary);
}

.nav-buttons {
  display: flex;
  gap: 8px;
  flex-shrink: 0;
}

.btn-nav {
  min-height: var(--touch-target-min);
  min-width: var(--touch-target-min);
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  border: none;
  background: var(--color-primary);
  color: #FFFFFF;
  font-family: var(--font-family-heading);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: background 0.2s, transform 0.1s;
}

.btn-nav:hover:not(:disabled) {
  background: var(--color-primary-dark);
}

.btn-nav:active:not(:disabled) {
  transform: translateY(1px);
}

.btn-nav:disabled {
  background: #C8D6D4;
  cursor: not-allowed;
  opacity: 0.6;
}

/* ==========================================================================
   Page Surface Card & Visual Hierarchy
   ========================================================================== */
.page-view-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1.5px solid var(--color-card-border);
  box-shadow: var(--shadow-card);
  padding: clamp(18px, 4vw, 36px) clamp(14px, 3.5vw, 36px);
  display: flex;
  flex-direction: column;
  gap: clamp(16px, 3vw, 24px);
  animation: fadeIn 0.3s ease;
  width: 100%;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Page Badge & Header */
.page-badge-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
}

.family-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  font-family: var(--font-family-heading);
  font-size: var(--font-size-badge);
  font-weight: 600;
  color: var(--color-primary);
  background: var(--color-yellow-light);
  border: 1px solid var(--color-yellow);
  white-space: nowrap;
}

.page-num-pill {
  font-family: var(--font-family-heading);
  font-size: var(--font-size-badge);
  font-weight: 700;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  white-space: nowrap;
}

.page-title {
  font-family: var(--font-family-heading);
  font-size: var(--font-size-title);
  font-weight: 700;
  color: var(--color-primary);
  line-height: var(--line-height-heading);
  word-break: break-word;
}

/* Instruction Banner */
.instruction-box {
  background: var(--color-yellow-light);
  border-left: 4px solid var(--color-yellow);
  border-radius: var(--radius-sm);
  padding: clamp(10px, 2vw, 14px) clamp(12px, 2.5vw, 18px);
  font-family: var(--font-family-body);
  font-size: var(--font-size-instruction);
  font-weight: 500;
  color: #273332;
  line-height: 1.65;
}

/* Visual Anchor Container (Natural Fluid Scaling) */
.visual-anchor-wrap {
  width: 100%;
  max-width: 100%;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-primary-subtle);
  border: 1px solid var(--color-card-border);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 4px;
}

.visual-anchor-img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: contain;
  max-height: clamp(180px, 35vw, 300px);
}

/* ==========================================================================
   Passage & Story Card
   ========================================================================== */
.passage-container {
  background: var(--color-card-bg);
  border: 1.5px solid var(--color-card-border);
  border-radius: var(--radius-md);
  padding: clamp(16px, 3vw, 24px) clamp(14px, 3vw, 26px);
  position: relative;
  max-width: var(--reading-max-width);
  width: 100%;
}

.passage-header-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.passage-title {
  font-family: var(--font-family-heading);
  font-size: var(--font-size-passage-title);
  font-weight: 700;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  display: inline-block;
}

.tts-btn {
  background: var(--color-surface);
  border: 1.5px solid var(--color-card-border);
  border-radius: var(--radius-pill);
  padding: 6px 14px;
  font-family: var(--font-family-heading);
  font-size: 13px;
  font-weight: 600;
  color: var(--color-primary);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 44px;
  min-width: 44px;
  transition: all 0.2s ease;
}

.tts-btn:hover {
  background: var(--color-primary-light);
  border-color: var(--color-primary);
}

.tts-btn.speaking {
  background: var(--color-coral);
  border-color: var(--color-coral);
  color: #FFFFFF;
}

.passage-body {
  font-family: var(--font-family-body);
  font-size: var(--font-size-passage);
  font-weight: 400;
  line-height: var(--line-height-thai);
  color: var(--color-text-body);
}

.passage-sentence {
  transition: background 0.2s;
  padding: 2px 3px;
  border-radius: 4px;
  display: inline;
  line-height: inherit;
}

.passage-sentence.interactive-clickable:hover {
  background: #D5ECE9;
  cursor: pointer;
}

.passage-sentence.selected-evidence {
  background: #FEE7B8;
  border-bottom: 3px solid var(--color-yellow);
  font-weight: 600;
}

/* ==========================================================================
   Question Interactive Blocks
   ========================================================================== */
.questions-list {
  display: flex;
  flex-direction: column;
  gap: clamp(16px, 2.5vw, 22px);
  max-width: var(--reading-max-width);
  width: 100%;
}

.question-card {
  background: var(--color-surface);
  border: 1.5px solid var(--color-card-border);
  border-radius: var(--radius-md);
  padding: clamp(16px, 3vw, 22px) clamp(14px, 3vw, 22px);
  display: flex;
  flex-direction: column;
  gap: 14px;
  box-shadow: var(--shadow-subtle);
  width: 100%;
}

.question-header {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.q-badge {
  width: 36px;
  height: 36px;
  min-width: 36px;
  border-radius: 50%;
  background: var(--color-coral);
  color: #FFFFFF;
  font-family: var(--font-family-heading);
  font-size: 16.5px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.q-badge.q-2 { background: var(--color-primary); }
.q-badge.q-3 { background: var(--color-yellow); color: var(--color-primary); }

.q-prompt-text {
  font-family: var(--font-family-body);
  font-size: var(--font-size-question);
  font-weight: 600;
  color: #1F2928;
  line-height: 1.55;
  padding-top: 2px;
}

/* Child Text Input & Controls */
.input-interactive-row {
  display: flex;
  gap: 10px;
  align-items: stretch;
  width: 100%;
}

.child-text-input {
  flex: 1;
  width: 100%;
  padding: 10px 14px;
  border: 1.5px solid var(--color-card-border);
  border-radius: var(--radius-sm);
  font-family: var(--font-family-body);
  font-size: 16.5px;
  color: var(--color-text-main);
  outline: none;
  min-height: var(--touch-target-min);
  background: var(--color-surface);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.child-text-input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(31, 78, 91, 0.12);
}

.input-buttons-group {
  display: flex;
  gap: 8px;
  flex-shrink: 0;
}

.btn-mic, .btn-check-answer {
  min-height: var(--touch-target-min);
  padding: 0 16px;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  font-family: var(--font-family-heading);
  font-size: 14px;
  font-weight: 600;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.btn-mic {
  background: var(--color-primary-light);
  color: var(--color-primary);
  border: 1.5px solid var(--color-card-border);
  min-width: var(--touch-target-min);
}

.btn-mic:hover {
  background: #D5ECE9;
  border-color: var(--color-primary);
}

.btn-mic.listening {
  background: var(--color-coral);
  color: #FFFFFF;
  border-color: var(--color-coral);
  animation: pulse 1s infinite alternate;
}

@keyframes pulse {
  from { box-shadow: 0 0 0 0 rgba(224, 109, 83, 0.5); }
  to { box-shadow: 0 0 0 8px rgba(224, 109, 83, 0); }
}

.btn-check-answer {
  background: var(--color-yellow);
  color: var(--color-primary);
}

.btn-check-answer:hover {
  background: #EAA023;
}

.btn-check-answer:active {
  transform: translateY(1px);
}

.answer-feedback-box {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  line-height: 1.6;
  display: none;
}

.answer-feedback-box.show {
  display: block;
}

.feedback-success {
  background: #E8F5E9;
  color: #2E7D32;
  border: 1px solid #A5D6A7;
}

.feedback-support {
  background: var(--color-yellow-light);
  color: #9C640C;
  border: 1px solid #FFE082;
}

/* ==========================================================================
   Sequence Interactive Widget (Page 12)
   ========================================================================== */
.sequence-interactive-wrap {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: var(--reading-max-width);
  width: 100%;
}

.seq-item-card {
  background: var(--color-surface);
  border: 1.5px solid var(--color-card-border);
  border-radius: var(--radius-sm);
  padding: clamp(12px, 2.5vw, 16px) clamp(12px, 2.5vw, 18px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  box-shadow: var(--shadow-subtle);
  transition: transform 0.15s ease;
  width: 100%;
}

.seq-order-badge {
  width: 38px;
  height: 38px;
  min-width: 38px;
  border-radius: 50%;
  border: 2px solid var(--color-primary);
  font-family: var(--font-family-heading);
  font-size: 17px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  background: var(--color-primary-light);
  flex-shrink: 0;
}

.seq-text {
  flex: 1;
  font-size: clamp(16px, 2vw, 18.5px);
  font-weight: 600;
  color: var(--color-text-main);
  line-height: 1.5;
}

.seq-btn-group {
  display: flex;
  gap: 6px;
  flex-shrink: 0;
}

.btn-move {
  min-width: var(--touch-target-min);
  min-height: var(--touch-target-min);
  border: 1px solid var(--color-card-border);
  background: var(--color-primary-light);
  color: var(--color-primary);
  border-radius: var(--radius-xs);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: bold;
}

.btn-move:hover:not(:disabled) {
  background: #D5ECE9;
}

.btn-move:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

/* ==========================================================================
   Drawing Canvas & Reflection (Page 32)
   ========================================================================== */
.drawing-canvas-wrap {
  border: 2px dashed var(--color-card-border);
  border-radius: var(--radius-md);
  padding: clamp(10px, 2.5vw, 16px);
  background: var(--color-surface);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  margin-top: 10px;
  width: 100%;
}

.canvas-container {
  width: 100%;
  max-width: 560px;
  aspect-ratio: 16 / 9;
  position: relative;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: #FFFFFF;
  border: 1px solid #E2E8E7;
}

#reflectionCanvas {
  width: 100%;
  height: 100%;
  touch-action: none;
  cursor: crosshair;
  display: block;
}

.canvas-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.btn-canvas {
  padding: 8px 16px;
  min-height: 44px;
  border-radius: var(--radius-xs);
  border: 1px solid var(--color-card-border);
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-family: var(--font-family-heading);
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.btn-canvas:hover {
  background: #D5ECE9;
}

/* ==========================================================================
   Field Trial Completion Card & Parent-Friendly Summary UI (Page 32)
   ========================================================================== */
.trial-completion-form-card {
  background: var(--color-surface);
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-lg);
  padding: clamp(18px, 4vw, 28px) clamp(14px, 3.5vw, 28px);
  margin-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  box-shadow: var(--shadow-card);
  width: 100%;
}

.trial-completion-title {
  font-family: var(--font-family-heading);
  font-size: clamp(18px, 2.5vw, 21px);
  font-weight: 700;
  color: var(--color-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.trial-meta-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 10px;
  background: var(--color-primary-subtle);
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 14px;
}

.trial-form-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
  width: 100%;
}

.trial-form-label {
  font-family: var(--font-family-heading);
  font-size: 14.5px;
  font-weight: 600;
  color: var(--color-primary);
}

.trial-select, .trial-textarea {
  padding: 10px 14px;
  border: 1.5px solid var(--color-card-border);
  border-radius: var(--radius-sm);
  font-family: var(--font-family-body);
  font-size: 15px;
  color: var(--color-text-main);
  background: var(--color-surface);
  outline: none;
  min-height: var(--touch-target-min);
  width: 100%;
}

.trial-privacy-notice {
  font-size: 13.5px;
  color: var(--color-text-muted);
  line-height: 1.6;
  background: var(--color-yellow-light);
  padding: 12px 14px;
  border-radius: var(--radius-xs);
  border-left: 3px solid var(--color-yellow);
}

/* Primary and Secondary Action Button Layout */
.trial-export-cta-row {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 6px;
  width: 100%;
}

.primary-cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  width: 100%;
}

.btn-hero-png {
  flex: 2;
  min-width: 220px;
  padding: 14px 24px;
  background: var(--color-primary);
  color: #FFFFFF;
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font-family-heading);
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 52px;
  box-shadow: 0 4px 12px rgba(31, 78, 91, 0.15);
  transition: all 0.2s ease;
}

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

.btn-action-share, .btn-action-copy {
  flex: 1;
  min-width: 130px;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-family: var(--font-family-heading);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 52px;
  transition: all 0.2s ease;
}

.btn-action-share {
  background: var(--color-yellow);
  color: var(--color-primary);
  border: none;
}
.btn-action-share:hover {
  background: #EAA023;
}

.btn-action-copy {
  background: var(--color-primary-light);
  color: var(--color-primary);
  border: 1.5px solid var(--color-primary);
}
.btn-action-copy:hover {
  background: #D5ECE9;
}

.secondary-json-group {
  padding-top: 10px;
  border-top: 1px dashed var(--color-card-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
}

.json-desc-label {
  font-size: 13.5px;
  color: var(--color-text-muted);
}

.btn-json-evidence {
  padding: 8px 16px;
  background: var(--color-surface);
  color: var(--color-primary);
  border: 1.5px solid var(--color-card-border);
  border-radius: var(--radius-sm);
  font-family: var(--font-family-heading);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 44px;
  transition: all 0.2s ease;
}

.btn-json-evidence:hover {
  background: var(--color-primary-subtle);
  border-color: var(--color-primary);
}

/* ==========================================================================
   Toast Notification
   ========================================================================== */
.toast-notification {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--color-primary);
  color: #FFFFFF;
  padding: 12px 24px;
  border-radius: var(--radius-pill);
  font-family: var(--font-family-heading);
  font-size: 14.5px;
  font-weight: 600;
  box-shadow: var(--shadow-float);
  opacity: 0;
  pointer-events: none;
  transition: all 0.3s cubic-bezier(0.18, 0.89, 0.32, 1.28);
  z-index: 1000;
  text-align: center;
  max-width: 90vw;
}

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

/* ==========================================================================
   Responsive Breakpoints for Mobile, Tablet & Desktop
   (Ensures 0 Horizontal Overflow and Auto-Fit from 320px to 1440px)
   ========================================================================== */

/* Mobile Stack for Questions & Controls (<= 580px) */
@media (max-width: 580px) {
  .input-interactive-row {
    flex-direction: column;
    gap: 8px;
  }
  
  .input-buttons-group {
    width: 100%;
    display: flex;
    gap: 8px;
  }
  
  .btn-mic {
    flex: 1;
  }
  
  .btn-check-answer {
    flex: 2;
  }

  .nav-select-wrap {
    min-width: 100%;
    order: 3;
    max-width: 100%;
  }

  .progress-bar-container {
    padding: 8px 10px;
  }

  .primary-cta-group {
    flex-direction: column;
  }

  .btn-hero-png, .btn-action-share, .btn-action-copy {
    width: 100%;
    min-width: 100%;
  }

  .secondary-json-group {
    flex-direction: column;
    align-items: stretch;
  }

  .btn-json-evidence {
    width: 100%;
    justify-content: center;
  }
}

/* Narrow Mobile Viewport Adjustments (<= 400px, e.g. 320px, 360px, 375px, 390px) */
@media (max-width: 400px) {
  .app-header {
    padding: 8px 10px;
  }
  
  .brand-title {
    font-size: 14.5px;
  }

  .utility-label {
    display: none;
  }

  .mode-toggle-btn {
    padding: 6px 10px;
    font-size: 12.5px;
  }

  .page-view-card {
    padding: 16px 12px;
    border-radius: var(--radius-md);
  }

  .trial-completion-form-card {
    padding: 16px 12px;
  }
}

/* Tablet & Desktop Refinements (>= 768px) */
@media (min-width: 768px) {
  .main-container {
    padding: 24px 20px;
  }
  
  .progress-bar-container {
    padding: 12px 18px;
  }
}

/* ==========================================================================
   Accessibility: Focus Visibility, High Contrast & Reduced Motion
   ========================================================================== */
:focus-visible {
  outline: 3px solid var(--color-coral);
  outline-offset: 3px;
}

button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
.interactive-clickable:focus-visible {
  outline: 3px solid var(--color-coral);
  outline-offset: 3px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (prefers-reduced-motion: reduce) {
  *, ::before, ::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}