/* GCSE Revision Hub - Base Styles */
/* Reset, variables, typography */

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

/* CSS Variables */
:root {
  /* Colors - Dark mode (default) */
  --bg-primary: #121820;
  --bg-secondary: #1a222d;
  --bg-card: rgba(255, 255, 255, 0.05);
  --bg-hover: rgba(255, 255, 255, 0.07);
  --border: #1e293b;
  --border-light: #334155;
  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --success: #22c55e;
  --warning: #eab308;
  --error: #ef4444;

  /* Subject colours */
  --color-physics: #6366f1;
  --color-chemistry: #ec4899;
  --color-biology: #22c55e;
  --color-history: #f59e0b;

  /* Content type colours */
  --color-story: #a855f7;
  --color-deepdive: #3b82f6;
  --color-facts: #22c55e;
  --color-tips: #f59e0b;
  --color-questions: #ef4444;
  --color-equations: #06b6d4;

  /* Touch targets */
  --touch-target-min: 44px;

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

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  --font-mono: 'SF Mono', Monaco, 'Cascadia Code', monospace;
  --font-xs: 12px;
  --font-sm: 13px;
  --font-base: 15px;
  --font-lg: 18px;
  --font-xl: 24px;
  --font-2xl: 32px;
  --line-height: 1.6;
  --line-height-tight: 1.3;

  /* Layout */
  --sidebar-width: 260px;
  --header-height: 48px;
  --breadcrumb-height: 36px;
  --content-max: 800px;
  --radius-xs: 3px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  /* Standard Gradients */
  --gradient-primary: linear-gradient(135deg, #3b82f6, #8b5cf6);
  --gradient-accent: linear-gradient(90deg, var(--accent), #8b5cf6);

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.3);
  --shadow-accent: 0 4px 12px rgba(59, 130, 246, 0.4);
  --shadow-accent-sm: 0 4px 8px rgba(59, 130, 246, 0.3);
  --shadow-purple: 0 4px 12px rgba(139, 92, 246, 0.4);
  --shadow-success: 0 4px 12px rgba(34, 197, 94, 0.4);
  --shadow-warning: 0 4px 12px rgba(245, 158, 11, 0.4);
  --shadow-error: 0 4px 12px rgba(239, 68, 68, 0.4);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
}

/* Light mode - triggered by #theme-toggle checkbox */
body:has(#theme-toggle:checked),
body:has(#theme-toggle:checked) .sidebar,
[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #f1f5f9;
  --bg-card: #ffffff;
  --bg-hover: rgba(0, 0, 0, 0.03);
  --border: #e2e8f0;
  --border-light: #cbd5e1;
  --text-primary: #1e293b;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --shadow-accent: 0 4px 12px rgba(59, 130, 246, 0.2);
  --shadow-accent-sm: 0 4px 8px rgba(59, 130, 246, 0.15);
  --shadow-purple: 0 4px 12px rgba(139, 92, 246, 0.2);
  --shadow-success: 0 4px 12px rgba(34, 197, 94, 0.2);
  --shadow-warning: 0 4px 12px rgba(245, 158, 11, 0.2);
  --shadow-error: 0 4px 12px rgba(239, 68, 68, 0.2);
}

/* ==============================================
   Theme Toggle Component
   ============================================== */

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  min-width: var(--touch-target-min);
  min-height: var(--touch-target-min);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
  padding: 0;
}

.theme-toggle:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.theme-toggle:active {
  transform: scale(0.96);
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.theme-toggle-icon {
  position: absolute;
  transition: opacity 200ms ease, transform 200ms ease;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

/* Default (dark) before theme attribute loads - show action (sun) */
.theme-toggle-sun {
  opacity: 1;
  transform: translate(-50%, -50%) rotate(0deg);
}

.theme-toggle-moon {
  opacity: 0;
  transform: translate(-50%, -50%) rotate(180deg);
}

/* Dark (default) shows sun (action: switch to light) */
[data-theme="dark"] .theme-toggle-sun {
  opacity: 1;
  transform: translate(-50%, -50%) rotate(0deg);
}

[data-theme="dark"] .theme-toggle-moon {
  opacity: 0;
  transform: translate(-50%, -50%) rotate(180deg);
}

/* Light shows moon (action: switch to dark) */
[data-theme="light"] .theme-toggle-sun {
  opacity: 0;
  transform: translate(-50%, -50%) rotate(180deg);
}

[data-theme="light"] .theme-toggle-moon {
  opacity: 1;
  transform: translate(-50%, -50%) rotate(0deg);
}

/* ==============================================
   Mastery Badge Component
   ============================================== */

.mastery-badge-component {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  position: relative;
  cursor: pointer;
  user-select: none;
}

.mastery-badge-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.mastery-badge-svg {
  width: 18px;
  height: 18px;
}

.mastery-badge-icon-only {
  gap: 0;
  padding: 0;
}

.mastery-badge-tooltip {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translate(-50%, -4px);
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 6px 10px;
  border-radius: 8px;
  font-size: var(--font-xs);
  white-space: nowrap;
  box-shadow: var(--shadow-sm);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
  z-index: 10;
}

.mastery-badge-component.is-open .mastery-badge-tooltip {
  opacity: 1;
  pointer-events: auto;
  transform: translate(-50%, 0);
}

/* ==============================================
   Streak Badge Component
   ============================================== */

.streak-badge-component {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  position: relative;
  cursor: pointer;
  user-select: none;
  color: var(--text-muted);
}

.streak-badge-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.streak-badge-svg {
  width: 18px;
  height: 18px;
}

.streak-badge-icon-only {
  gap: 0;
  padding: 0;
}

.streak-badge-tooltip {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translate(-50%, -4px);
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 6px 10px;
  border-radius: 8px;
  font-size: var(--font-xs);
  white-space: nowrap;
  box-shadow: var(--shadow-sm);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
  z-index: 10;
}

.streak-badge-component.is-open .streak-badge-tooltip {
  opacity: 1;
  pointer-events: auto;
  transform: translate(-50%, 0);
}

.streak-tier-muted {
  color: var(--text-muted);
}

.streak-tier-warm {
  color: #f59e0b;
}

.streak-tier-hot {
  color: #f97316;
}

.streak-tier-inferno {
  color: #ef4444;
  filter: drop-shadow(0 0 6px rgba(239, 68, 68, 0.45));
}

/* ==============================================
   XP Badge Component
   ============================================== */

.xp-badge-component {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  position: relative;
  cursor: pointer;
  user-select: none;
  color: var(--accent);
}

.xp-badge-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.xp-badge-svg {
  width: 18px;
  height: 18px;
}

.xp-badge-icon-only {
  gap: 0;
  padding: 0;
}

.xp-badge-tooltip {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translate(-50%, -4px);
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 6px 10px;
  border-radius: 8px;
  font-size: var(--font-xs);
  white-space: nowrap;
  box-shadow: var(--shadow-sm);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
  z-index: 10;
}

.xp-badge-component.is-open .xp-badge-tooltip {
  opacity: 1;
  pointer-events: auto;
  transform: translate(-50%, 0);
}

.xp-badge-gain {
  position: absolute;
  top: -8px;
  left: 50%;
  transform: translate(-50%, 0);
  font-size: var(--font-xs);
  color: var(--accent);
  opacity: 0;
  pointer-events: none;
  animation: xpBadgeFloat 1200ms ease-out forwards;
}

.xp-badge-pulse .xp-badge-svg {
  animation: xpBadgePulse 400ms ease-out;
}

/* ==============================================
   App Icon + Title Components
   ============================================== */

.app-icon-button {
  width: 56px;
  height: 56px;
  border-radius: 0;
  border: none;
  background: transparent;
  color: var(--text-primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  cursor: pointer;
}

.app-icon-button img {
  display: block;
}

.header-line1 .app-icon-button svg,
.header-line1 .app-icon-button img {
  width: 56px;
  height: 56px;
}

.app-title-button {
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-size: 22px;
  font-weight: 700;
  font-family: 'Poppins', 'Inter', 'Segoe UI', system-ui, sans-serif;
  letter-spacing: 0.4px;
  cursor: pointer;
  padding: 0;
}

.header-icon-plain {
  background: transparent !important;
  border: none !important;
  box-shadow: none !important;
  width: 32px;
  height: 32px;
  min-width: 32px;
  min-height: 32px;
  padding: 0;
}

.header-icon-plain:hover {
  background: transparent !important;
}

.header-icon-plain.theme-toggle {
  color: var(--text-secondary);
}

.header-icon-plain.theme-toggle:hover {
  color: var(--text-primary);
}

.app-title-prep {
  color: #203852 !important;
  font-weight: 700;
}

.app-title-wise {
  color: #2A6A54 !important;
  font-weight: 600;
  margin-left: 2px;
}

[data-theme="light"] .app-title-prep {
  color: #203852 !important;
}

[data-theme="light"] .app-title-wise {
  color: #2A6A54 !important;
}

[data-theme="dark"] .app-title-prep {
  color: #EAF2FF !important;
}

[data-theme="dark"] .app-title-wise {
  color: #90A58F !important;
}

.notifications-btn {
  position: relative;
  width: 32px;
  height: 32px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
}

.notifications-btn[disabled] {
  opacity: 0.5;
  cursor: not-allowed;
}

.notifications-dot {
  position: absolute;
  top: 6px;
  right: 6px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--text-muted);
}

/* ==============================================
   Header Line 1 Component
   ============================================== */

.header-line1 {
  width: 100%;
}

.header-line1-inner {
  display: grid;
  grid-template-columns: minmax(64px, auto) 1fr minmax(64px, auto);
  align-items: center;
  gap: 12px;
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
}

.header-line1-left,
.header-line1-center,
.header-line1-right {
  display: flex;
  align-items: center;
}

.header-line1-center {
  justify-content: center;
}

.header-line1-right {
  justify-content: flex-end;
  gap: 10px;
}

/* ==============================================
   Header Two Line Component
   ============================================== */

.header-two-line {
  width: 100%;
  max-width: 800px;
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border);
  border-radius: 0;
  box-shadow: none;
  padding: 6px 16px 4px;
  margin: 0 auto 10px;
  box-sizing: border-box;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-two-line-inner {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 100%;
}

.header-two-line-row2 {
  /* border-top: 1px solid var(--border); - Removed separator between row1 and row2 */
  padding-top: 4px;
}

.header-row2 {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 12px;
  width: 100%;
}

.header-row2-left,
.header-row2-center,
.header-row2-right {
  display: flex;
  align-items: center;
  gap: 10px;
}

.header-row2-center {
  justify-content: center;
  justify-self: center;
  text-align: center;
}

.header-row2-right {
  justify-content: flex-end;
  justify-self: end;
}

.task-context-label {
  font-family: 'Poppins', 'Inter', 'Segoe UI', system-ui, sans-serif;
  font-weight: 600;
  font-size: 18px;
  color: var(--text-primary);
  letter-spacing: 0.2px;
  white-space: nowrap;
  text-align: center;
}

.task-context-label .task-context-muted {
  color: var(--text-secondary);
}

/* Shared width constraint utility */
.page-width-800 {
  max-width: 800px;
  margin: 0 auto;
  width: 100%;
}

.page-width-800.session-scroll-wrapper {
  margin: 0 auto;
}

/* Offset homepage content for sticky header height */
.homepage .homepage-content {
  padding-top: calc(var(--space-6) + var(--header-two-line-height, 0px));
}

/* Normalize legacy site-header when using header-two-line */
.site-header.header-two-line {
  display: block;
}

.site-header.header-two-line .site-header-inner {
  padding: 0;
  max-width: 100%;
}

@keyframes xpBadgeFloat {
  0% {
    opacity: 0;
    transform: translate(-50%, 4px);
  }
  20% {
    opacity: 1;
  }
  100% {
    opacity: 0;
    transform: translate(-50%, -14px);
  }
}

@keyframes xpBadgePulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.18); }
  100% { transform: scale(1); }
}

/* ==============================================
   ROLE-BASED VIEW SWITCHING
   Used by AppState to show/hide content by role
   ============================================== */

/* Base: hide all role-specific content */
.guest-only,
.student-only,
.parent-only {
  display: none !important;
}

/* Show content based on body class */
body.guest .guest-only { display: block !important; }
body.student .student-only { display: block !important; }
body.parent .parent-only { display: block !important; }

/* For inline elements that need role switching */
body.guest .guest-only-inline { display: inline !important; }
body.student .student-only-inline { display: inline !important; }
body.parent .parent-only-inline { display: inline !important; }

/* For flex elements that need role switching */
body.guest .guest-only-flex { display: flex !important; }
body.student .student-only-flex { display: flex !important; }
body.parent .parent-only-flex { display: flex !important; }

/* Complete view switching (for index.html) */
#guest-view,
#student-view {
  display: none;
}

body.guest #guest-view { display: block; }
body.student #student-view { display: block; }

/* Mastery disabled (temporary refactor) */
.mastery-disabled .mastery-badge,
.mastery-disabled .mastery-badge-component,
.mastery-disabled [data-component="mastery-badge"],
.mastery-disabled #mastery-badge,
.mastery-disabled .subject-card-mastery,
.mastery-disabled .flow-achievement--mastery {
  display: none !important;
}

/* ==============================================
   BASE ELEMENTS
   ============================================== */

/* Base Elements */
html {
  font-size: var(--font-base);
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-base);
  line-height: var(--line-height);
  color: var(--text-primary);
  background-color: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: var(--line-height-tight);
  color: var(--text-primary);
}

h1 { font-size: var(--font-2xl); }
h2 { font-size: var(--font-xl); }
h3 { font-size: var(--font-lg); }
h4 { font-size: var(--font-base); }

p {
  margin-bottom: var(--space-md);
  color: var(--text-secondary);
}

p:last-child {
  margin-bottom: 0;
}

/* Links */
a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--accent-hover);
}

/* Lists */
ul, ol {
  padding-left: var(--space-lg);
  margin-bottom: var(--space-md);
  color: var(--text-secondary);
}

li {
  margin-bottom: var(--space-xs);
}

li:last-child {
  margin-bottom: 0;
}

/* Code */
code {
  font-family: var(--font-mono);
  font-size: var(--font-sm);
  background: var(--bg-hover);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
}

pre {
  font-family: var(--font-mono);
  font-size: var(--font-sm);
  background: var(--bg-secondary);
  padding: var(--space-md);
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin-bottom: var(--space-md);
}

pre code {
  background: none;
  padding: 0;
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--space-md);
  font-size: var(--font-sm);
}

th, td {
  padding: var(--space-sm) var(--space-md);
  text-align: left;
  border-bottom: 1px solid var(--border);
}

th {
  font-weight: 600;
  color: var(--text-primary);
  background: var(--bg-card);
}

td {
  color: var(--text-secondary);
}

tr:hover td {
  background: var(--bg-hover);
}

/* Strong and emphasis */
strong, b {
  font-weight: 600;
  color: var(--text-primary);
}

em, i {
  font-style: italic;
}

/* Horizontal rule */
hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: var(--space-xl) 0;
}

/* Selection */
::selection {
  background: var(--accent);
  color: white;
}

/* Focus styles */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--border-light);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

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

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

.text-accent {
  color: var(--accent);
}

/* ==================== CONFIDENCE RATING MODAL ==================== */

.confidence-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10000;
  padding: var(--space-lg);
  animation: fadeIn 0.2s ease;
}

.confidence-modal {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  max-width: 500px;
  width: 100%;
  padding: var(--space-xl);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  animation: slideUp 0.3s ease;
}

.confidence-header {
  text-align: center;
  margin-bottom: var(--space-xl);
}

.confidence-header h3 {
  font-size: var(--font-lg);
  font-weight: 700;
  color: var(--text-primary);
  margin: 0 0 var(--space-sm) 0;
}

.confidence-header p {
  font-size: var(--font-md);
  color: var(--text-muted);
  margin: 0;
}

.confidence-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.confidence-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-lg);
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: center;
}

.confidence-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

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

.confidence-icon {
  width: 48px;
  height: 48px;
  margin-bottom: var(--space-xs);
}

.confidence-label {
  font-size: var(--font-md);
  font-weight: 700;
  color: var(--text-primary);
}

.confidence-desc {
  font-size: var(--font-sm);
  color: var(--text-muted);
}

/* Confidence levels */
.confidence-low {
  border-color: #ef4444;
}

.confidence-low:hover {
  background: linear-gradient(135deg, rgba(239, 68, 68, 0.1), rgba(220, 38, 38, 0.05));
  border-color: #dc2626;
}

.confidence-low .confidence-icon {
  color: #ef4444;
}

.confidence-medium {
  border-color: #f59e0b;
}

.confidence-medium:hover {
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.1), rgba(217, 119, 6, 0.05));
  border-color: #d97706;
}

.confidence-medium .confidence-icon {
  color: #f59e0b;
}

.confidence-high {
  border-color: #22c55e;
}

.confidence-high:hover {
  background: linear-gradient(135deg, rgba(34, 197, 94, 0.1), rgba(22, 163, 74, 0.05));
  border-color: #16a34a;
}

.confidence-high .confidence-icon {
  color: #22c55e;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Mobile adjustments */
@media (max-width: 600px) {
  .confidence-modal {
    padding: var(--space-lg);
  }

  .confidence-btn {
    padding: var(--space-md);
  }

  .confidence-icon {
    width: 36px;
    height: 36px;
  }

  .confidence-label {
    font-size: var(--font-sm);
  }

  .confidence-desc {
    font-size: var(--font-xs);
  }
}