/* ==========================================
   Roshan Study Stylesheet - Design System
   ========================================== */

@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap');

:root {
  /* Light Mode Variables */
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --card-bg: rgba(255, 255, 255, 0.85);
  --card-border: rgba(226, 232, 240, 0.8);
  --accent-color: #3b82f6;
  --accent-hover: #1d4ed8;
  --accent-light: #eff6ff;
  --shadow-color: rgba(148, 163, 184, 0.12);
  --success-color: #10b981;
  --danger-color: #ef4444;
  --warning-color: #f59e0b;
  --streak-color: #ff6b6b;
  --font-base: 'Plus Jakarta Sans', sans-serif;
  --font-heading: 'Outfit', sans-serif;
  --border-radius-lg: 20px;
  --border-radius-md: 12px;
  --border-radius-sm: 8px;
  --transition-speed: 0.3s;
}

/* Dark Mode Variables */
[data-theme="dark"] {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --card-bg: rgba(30, 41, 59, 0.85);
  --card-border: rgba(51, 65, 85, 0.8);
  --accent-color: #60a5fa;
  --accent-hover: #3b82f6;
  --accent-light: rgba(96, 165, 250, 0.1);
  --shadow-color: rgba(0, 0, 0, 0.3);
  --success-color: #34d399;
  --danger-color: #f87171;
  --warning-color: #fbbf24;
}

/* High Contrast Mode Variables */
[data-theme="high-contrast"] {
  --bg-primary: #000000;
  --bg-secondary: #000000;
  --text-primary: #ffffff;
  --text-secondary: #ffff00;
  --card-bg: #000000;
  --card-border: #ffffff;
  --accent-color: #ffff00;
  --accent-hover: #ffffff;
  --accent-light: #000000;
  --shadow-color: transparent;
  --success-color: #00ff00;
  --danger-color: #ff0000;
  --warning-color: #ffff00;
}

/* Accessibility: Large Font Mode */
[data-font-size="large"] {
  font-size: 1.2rem;
}
[data-font-size="large"] h1 { font-size: 2.8rem; }
[data-font-size="large"] h2 { font-size: 2.2rem; }
[data-font-size="large"] h3 { font-size: 1.8rem; }
[data-font-size="large"] .btn {
  padding: 0.75rem 1.5rem;
  font-size: 1.25rem;
}
[data-font-size="large"] .card-body {
  padding: 2rem;
}

/* Base Reset & Typography */
body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-base);
  transition: background-color var(--transition-speed), color var(--transition-speed);
  min-height: 100vh;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--text-primary);
}

/* Layout Elements */
.glass-header {
  background: var(--card-bg);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--card-border);
  position: sticky;
  top: 0;
  z-index: 1020;
}

.logo-text {
  font-family: var(--font-heading);
  font-weight: 800;
  background: linear-gradient(135deg, #3b82f6, #8b5cf6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Custom Cards */
.custom-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--border-radius-lg);
  box-shadow: 0 10px 30px var(--shadow-color);
  backdrop-filter: blur(10px);
  transition: transform var(--transition-speed), box-shadow var(--transition-speed), border-color var(--transition-speed);
}

.custom-card:hover {
  box-shadow: 0 15px 35px var(--shadow-color);
  border-color: var(--accent-color);
}

/* Subject Navigation Cards */
.subject-card {
  overflow: hidden;
  position: relative;
  height: 100%;
}

.subject-card-header {
  height: 8px;
  width: 100%;
}

/* Circular Progress Indicator */
.progress-ring {
  transform: rotate(-90deg);
}

.progress-ring__circle {
  transition: stroke-dashoffset 0.35s;
  transform-origin: 50% 50%;
}

/* Highlight border for speaking note in Text-To-Speech */
.speaking-note-active {
  border: 3px solid var(--warning-color) !important;
  box-shadow: 0 0 15px rgba(245, 158, 11, 0.4) !important;
  animation: border-pulse 1.5s infinite;
}

@keyframes border-pulse {
  0% { opacity: 0.8; }
  50% { opacity: 1; }
  100% { opacity: 0.8; }
}

/* Matching Game Layout & State styles */
.match-container {
  display: flex;
  flex-direction: row;
  gap: 20px;
}

.match-column {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.match-item {
  background: var(--bg-secondary);
  border: 2px solid var(--card-border);
  border-radius: var(--border-radius-md);
  padding: 15px;
  cursor: pointer;
  user-select: none;
  font-weight: 500;
  transition: all var(--transition-speed);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.match-item:hover {
  border-color: var(--accent-color);
  background: var(--accent-light);
}

.match-item.selected {
  border-color: var(--accent-color);
  background: var(--accent-light);
  transform: scale(1.02);
  box-shadow: 0 5px 15px var(--shadow-color);
}

.match-item.matched-correct {
  border-color: var(--success-color);
  background: rgba(16, 185, 129, 0.1);
  cursor: default;
  pointer-events: none;
}

.match-item.matched-incorrect {
  border-color: var(--danger-color);
  background: rgba(239, 68, 68, 0.1);
}

/* Slide note cards styling */
.note-slider-container {
  overflow: hidden;
  position: relative;
  min-height: 250px;
}

.note-card {
  position: relative !important;
  width: 100%;
  opacity: 1 !important;
  pointer-events: auto !important;
  transform: none !important;
  margin-bottom: 20px !important;
  transition: box-shadow var(--transition-speed), border-color var(--transition-speed);
  scroll-margin-top: 100px;
}

/* Practice Formats */
.fib-input {
  display: inline-block;
  width: auto;
  min-width: 120px;
  border: none;
  border-bottom: 2px dashed var(--accent-color);
  background: transparent;
  color: var(--text-primary);
  text-align: center;
  font-weight: 600;
  padding: 0 5px;
}

.fib-input:focus {
  outline: none;
  border-bottom-style: solid;
}

.rearrange-word-badge {
  font-size: 1.1rem;
  padding: 10px 20px;
  margin: 5px;
  cursor: pointer;
  background-color: var(--accent-light);
  color: var(--accent-color);
  border: 1px solid var(--accent-color);
  border-radius: var(--border-radius-sm);
  display: inline-block;
  user-select: none;
  transition: all var(--transition-speed);
}

.rearrange-word-badge:hover {
  background-color: var(--accent-color);
  color: #fff;
}

.rearrange-word-badge.used {
  opacity: 0.4;
  pointer-events: none;
}

/* Sidebar and Settings Overlay Drawer */
.settings-drawer {
  position: fixed;
  top: 0;
  right: -350px;
  width: 350px;
  height: 100%;
  background: var(--bg-secondary);
  border-left: 1px solid var(--card-border);
  box-shadow: -10px 0 30px var(--shadow-color);
  z-index: 1050;
  transition: right 0.3s ease-in-out;
  overflow-y: auto;
  padding: 20px;
}

.settings-drawer.open {
  right: 0;
}

.drawer-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  z-index: 1040;
  display: none;
}

.drawer-backdrop.show {
  display: block;
}

/* High Contrast Adjustments */
[data-theme="high-contrast"] .custom-card {
  border-width: 2px;
}

[data-theme="high-contrast"] .btn-primary {
  background-color: #ffff00;
  color: #000000;
  border-color: #ffffff;
  font-weight: bold;
}

[data-theme="high-contrast"] .btn-primary:hover {
  background-color: #ffffff;
  color: #000000;
}

[data-theme="high-contrast"] .badge {
  border: 1px solid #fff;
}

/* Quick Utilities */
.streak-badge {
  background: linear-gradient(135deg, #ff6b6b, #ff8787);
  color: #fff;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.vocab-word-card {
  border-left: 5px solid var(--accent-color) !important;
}

.nav-tabs .nav-link {
  color: var(--text-secondary);
  font-weight: 600;
  border: none;
  border-bottom: 3px solid transparent;
  padding: 12px 20px;
}

.nav-tabs .nav-link:hover {
  border-bottom-color: var(--card-border);
}

.nav-tabs .nav-link.active {
  color: var(--accent-color) !important;
  background: transparent;
  border-bottom: 3px solid var(--accent-color);
}

/* Accessibility Focus Indicator */
*:focus-visible {
  outline: 3px solid var(--accent-color);
  outline-offset: 3px;
}

/* Interactive Word Highlighting */
.word-speak {
  display: inline-block;
  cursor: help;
  padding: 0 1px;
  border-radius: 4px;
  border-bottom: 2px dotted transparent;
  transition: all 0.2s ease-in-out;
  user-select: none;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
}

.word-speak:hover {
  background-color: var(--accent-light);
  border-bottom-color: var(--accent-color);
  color: var(--accent-hover);
}

/* High Contrast theme adaptation */
[data-theme="high-contrast"] .word-speak:hover {
  background-color: #ffff00;
  color: #000000;
  border-bottom-color: #ffffff;
}

/* Saved Vocabulary Word Style (Yellow Underline & Subtle Highlight) */
.word-speak.word-saved {
  border-bottom: 2px solid #f59e0b !important;
  background-color: rgba(245, 158, 11, 0.08);
}

[data-theme="dark"] .word-speak.word-saved {
  border-bottom-color: #fbbf24 !important;
  background-color: rgba(251, 191, 36, 0.12);
}

[data-theme="high-contrast"] .word-speak.word-saved {
  border-bottom-color: #ffff00 !important;
  background-color: transparent;
}