@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,wght@0,400..700;1,400..700&family=JetBrains+Mono:wght@400;500&family=Lora:ital,wght@0,400..700;1,400..700&family=Sora:wght@400..800&display=swap');

:root {
  /* Colors */
  --bg-primary: #F8F7F2;
  --bg-secondary: #EEEDE6;
  --surface: #FFFFFF;
  --border: #E2E0D6;

  --text-primary: #1A1A2E;
  --text-secondary: #4A4A6A;
  --text-muted: #9090A8;

  --accent-primary: #2D6A4F;
  --accent-hover: #1B4332;
  --accent-pale: #D8F3DC;

  --gold-special: #C9A84C;
  --gold-pale: #FDF3D9;

  --danger: #E63946;
  --info: #2B6CB0;

  /* Typography */
  --font-display: 'Sora', sans-serif;
  --font-body: 'DM Sans', sans-serif;
  --font-content: 'Lora', serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 40px;
  --spacing-2xl: 80px;

  /* Border Radius */
  --radius-btn: 8px;
  --radius-card: 12px;
  --radius-panel: 16px;
  --radius-pill: 999px;

  /* Shadows */
  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.06), 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-card-hover: 0 4px 16px rgba(0, 0, 0, 0.10), 0 2px 6px rgba(0, 0, 0, 0.06);
  --shadow-panel: 0 8px 32px rgba(0, 0, 0, 0.12);
  --shadow-nav: 0 1px 0px #E2E0D6;
  
  /*pdf viedw*/
  --input-border: #D4D2C8;
  --btn-primary: #2D6A4F;
  --success: #2D6A4F;
  --warning: #C9A84C;
}




/* Reset & Base */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  width: 100%;
}

html {
  width: 100%;
}

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

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

::-webkit-scrollbar-thumb {
  background: var(--accent-primary);
  border-radius: 999px;
}

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

/* Firefox */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--accent-primary) var(--bg-secondary);
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
}

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
}

/* Typography Utilities */
.hero-title {
  font-weight: 800;
  font-size: 30px;
  letter-spacing: -0.5px;
}

@media (min-width: 768px) {
  .hero-title {
    font-size: 56px;
    letter-spacing: -1px;
  }
}

.page-title {
  font-weight: 700;
  font-size: 26px;
}

.section-title {
  font-weight: 600;
  font-size: 20px;
}

.card-title {
  font-weight: 600;
  font-size: 15px;
  margin-bottom: var(--spacing-xs);
}

.label {
  font-weight: 500;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
}

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

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

/* Layout Utilities */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  width: 100%;
  overflow-x: hidden;
}

.flex {
  display: flex;
}

.flex-col {
  display: flex;
  flex-direction: column;
}

.items-center {
  align-items: center;
}

.justify-between {
  justify-content: space-between;
}

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

.gap-xs {
  gap: var(--spacing-xs);
}

.gap-sm {
  gap: var(--spacing-sm);
}

.gap-md {
  gap: var(--spacing-md);
}

.gap-lg {
  gap: var(--spacing-lg);
}

.gap-xl {
  gap: var(--spacing-xl);
}

/* Components */
/* Navbar */
.navbar {
  height: 72px;
  box-shadow: var(--shadow-nav);
  background-color: var(--bg-primary);
  position: sticky !important;
  top: 0 !important;
  z-index: 1000 !important;
  display: flex;
  align-items: center;
}

.sticky-top {
  position: sticky !important;
  top: 0 !important;
  z-index: 1000 !important;
}

.logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  color: var(--accent-primary);
  white-space: nowrap;
}

@media (min-width: 768px) {
  .logo {
    font-size: 22px;
  }
}

.nav-links {
  display: none;
}

@media (min-width: 768px) {
  .nav-links {
    display: flex;
    gap: var(--spacing-lg);
    font-weight: 500;
    color: var(--text-secondary);
  }

  .nav-links a:hover {
    color: var(--accent-primary);
    transition: color 0.2s ease;
  }
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.nav-actions .btn {
  display: none;
}

@media (min-width: 480px) {
  .nav-actions {
    gap: var(--spacing-md);
  }
  .nav-actions .btn {
    display: inline-flex;
  }
}

.mobile-menu .btn {
  width: 100%;
  margin-bottom: var(--spacing-md);
  justify-content: center;
}

.mobile-menu-toggle {
  display: block;
  background: none;
  border: none;
  cursor: pointer;
  padding: 10px;
  width: 44px;
  height: 44px;
  position: relative;
  z-index: 1001;
}

@media (min-width: 768px) {
  .mobile-menu-toggle {
    display: none;
  }
}

.mobile-menu-toggle span {
  display: block;
  width: 24px;
  height: 2.5px;
  background-color: var(--text-primary);
  margin: 5px 0;
  transition: 0.3s;
  border-radius: 2px;
}

/* Hamburger animation */
.mobile-menu-toggle.active span:nth-child(1) {
  transform: translateY(7.5px) rotate(45deg);
}

.mobile-menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
  transform: translateY(-7.5px) rotate(-45deg);
}

.mobile-menu {
  position: fixed;
  top: 0;
  right: -100%;
  width: 80%;
  max-width: 300px;
  height: 100vh;
  background-color: var(--surface);
  z-index: 1000;
  padding: 80px 24px 24px;
  box-shadow: -4px 0 16px rgba(0, 0, 0, 0.1);
  transition: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.mobile-menu.active {
  right: 0;
}

.mobile-nav-link {
  font-size: 18px;
  font-weight: 600;
  padding: 12px 16px;
  border-radius: var(--radius-btn);
  color: var(--text-primary);
  transition: 0.2s;
  border-left: 3px solid transparent;
}

.mobile-nav-link:hover {
  background-color: var(--bg-primary);
  color: var(--accent-primary);
  border-left-color: var(--accent-primary);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  border-radius: var(--radius-btn);
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  transition: all 0.2s ease;
  border: none;
}

.btn-primary {
  background-color: var(--accent-primary);
  color: #fff;
}

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

.btn-ghost {
  background-color: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border);
}

.btn-ghost:hover {
  background-color: var(--bg-secondary);
  border-color: var(--text-secondary);
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.5px;
}

.badge-gold {
  background-color: var(--gold-pale);
  color: #927521;
}

.badge-green {
  background-color: var(--accent-pale);
  color: var(--accent-hover);
}

.badge-blue {
  background-color: #EBF8FF;
  color: var(--info);
}

/* Cards */
.card {
  background-color: var(--surface);
  border-radius: var(--radius-card);
  padding: var(--spacing-md);
  box-shadow: var(--shadow-card);
  transition: all 0.2s ease;
  border: 1px solid transparent;
}

.card:hover {
  box-shadow: var(--shadow-card-hover);
  border-color: var(--border);
  transform: translateY(-2px);
}

/* Specific Sections */
.hero {
  padding: var(--spacing-xl) 0;
  position: relative;
  overflow: hidden;
  background-image: radial-gradient(var(--border) 1px, transparent 1px);
  background-size: 20px 20px;
}

@media (min-width: 768px) {
  .hero {
    padding: var(--spacing-2xl) 0;
  }
}

.stats-bar {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background-color: var(--surface);
  padding: var(--spacing-md) 0;
}

.stats-bar .container {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
}

@media (min-width: 768px) {
  .stats-bar .container {
    display: flex;
    justify-content: space-between;
  }
}

.stat-item {
  text-align: center;
  flex: 1;
}

.stat-number {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 700;
  color: var(--accent-primary);
}

.stat-label {
  font-size: 14px;
  color: var(--text-secondary);
}

/* Subject Grid */
.subject-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

@media (min-width: 768px) {
  .subject-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .subject-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.subject-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-btn);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--spacing-md);
  font-size: 24px;
}

.icon-physics {
  background-color: #EBF8FF;
  color: #2B6CB0;
}

.icon-chemistry {
  background-color: var(--accent-pale);
  color: var(--accent-primary);
}

.icon-maths {
  background-color: var(--gold-pale);
  color: var(--gold-special);
}

.icon-biology {
  background-color: #FDEDED;
  color: #C0392B;
}

/* How It Works */
.steps-container {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

@media (min-width: 768px) {
  .steps-container {
    grid-template-columns: repeat(3, 1fr);
  }
}

.step-card {
  text-align: center;
  padding: var(--spacing-lg);
  background-color: var(--bg-secondary);
  border-radius: var(--radius-card);
}

.step-number {
  width: 32px;
  height: 32px;
  background-color: var(--accent-primary);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  margin: 0 auto var(--spacing-md);
}

/* Footer */
.footer {
  background-color: var(--bg-secondary);
  padding: var(--spacing-xl) 0 var(--spacing-lg);
  margin-top: var(--spacing-2xl);
  border-top: 1px solid var(--border);
}

.footer .container {
  flex-direction: column;
  text-align: center;
  gap: var(--spacing-lg);
}

@media (min-width: 768px) {
  .footer .container {
    flex-direction: row;
    text-align: left;
  }
}

.footer .nav-links {
  display: flex !important;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--spacing-md) !important;
}

@media (min-width: 768px) {
  .footer .nav-links {
    justify-content: flex-end;
  }
}

/* VIEWER PAGE SPECIFIC */
.viewer-layout {
  display: flex;
  min-height: calc(100vh - 72px);
  flex-direction: column;
  max-width: 100vw;
  overflow-x: hidden;
}

.content-body img, 
.content-body video, 
.content-body table {
  max-width: 100% !important;
  height: auto !important;
}

.content-body table {
  display: block;
  overflow-x: auto;
}

.content-body {
  word-wrap: break-word;
  overflow-wrap: break-word;
}

@media (min-width: 768px) {
  .viewer-layout {
    flex-direction: row;
  }
}

.mobile-sidebar-header {
  display: none;
}

.sidebar {
  width: 100%;
  background-color: var(--surface);
  border-right: 1px solid var(--border);
  padding: var(--spacing-md);
  overflow-y: auto;
  padding-top:10px;
}

.main-area {
  flex: 1;
  padding: var(--spacing-lg);
  background-color: var(--bg-primary);
  min-height: 100%;
  display: flex;
  flex-direction: column;
}

@media (min-width: 768px) {
  .sidebar {
    width: 340px;
    min-width: 340px;
    flex-shrink: 0;
    position: sticky;
    top: 72px;
    height: calc(100vh - 72px);
  }
}

.file-cards-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
}

@media (min-width: 768px) {
  .file-cards-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Tree Nav */
.tree-nav {
  margin-top: var(--spacing-md);
}

.tree-item {
  padding: 10px 12px;
  cursor: pointer;
  color: var(--text-secondary);
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  align-items: center;
  gap: 8px;
  border-radius: var(--radius-btn);
  user-select: none;
  margin: 2px 0;
}

.tree-item:hover {
  background-color: var(--bg-secondary);
  color: var(--accent-primary);
}

.tree-item.active {
  background-color: var(--accent-pale);
  color: var(--accent-primary);
  font-weight: 700;
}

.tree-item .icon {
  width: 14px;
  display: inline-block;
  text-align: center;
  transition: transform 0.2s ease;
}

.tree-children {
  padding-left: 20px;
  display: none;
  overflow: hidden;
  border-left: 1px solid var(--border);
  margin-left: 18px;
}

.tree-children.open {
  display: block;
}

.tree-item+.tree-children.open {
  margin-top: 4px;
  margin-bottom: 8px;
}

/* Topic links inside the tree */
a.tree-leaf {
  display: block;
  text-decoration: none;
  font-size: 15px; /* Increased from 14px */
  color: var(--text-secondary);
}

a.tree-leaf.active {
  color: var(--accent-primary);
  font-weight: 700;
  background-color: var(--accent-pale);
}

/* Viewer Panel */
.viewer-wrapper {
  display: flex;
  justify-content: center;
  padding: var(--spacing-lg) 0;
}

.viewer-panel {
  width: 100%;
  max-width: 780px;
  background-color: #fff;
  box-shadow: var(--shadow-panel);
  border-radius: var(--radius-panel);
  padding: 24px 20px;
  font-family: var(--font-content);
  font-size: 16px; /* Increased from 15px */
  line-height: 1.8;
  color: #000;
}

@media (min-width: 768px) {
  .viewer-panel {
    padding: 60px 80px;
  }
}

.material-tabs::-webkit-scrollbar {
  display: none;
}

.material-tabs {
  -ms-overflow-style: none;
  scrollbar-width: none;
}

.viewer-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  border-bottom: 2px solid #000;
  padding-bottom: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.viewer-meta {
  font-family: var(--font-body);
  font-size: 14px;
  color: #333;
  margin-bottom: var(--spacing-xl);
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.viewer-section-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  margin: var(--spacing-lg) 0 var(--spacing-md);
  border-bottom: 1px solid #ccc;
  padding-bottom: var(--spacing-xs);
}

.question {
  margin-bottom: var(--spacing-lg);
}

.options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xs);
  margin-top: var(--spacing-sm);
}

/* Print CSS */
@media print {
  body * {
    visibility: hidden;
  }

  .viewer-panel,
  .viewer-panel * {
    visibility: visible;
  }

  .viewer-panel {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    max-width: none;
    box-shadow: none;
    border-radius: 0;
    padding: 0;
    margin: 0;
  }

  @page {
    size: A4;
    margin: 2cm;
  }
}

/* Lead Popup Modal */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: var(--spacing-md);
}

.modal-overlay.active {
  display: flex;
}

.modal-container {
  background: #fff;
  width: 100%;
  max-width: 900px;
  overflow: hidden;
  display: flex;
  box-shadow: var(--shadow-panel);
  animation: modalScale 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  position: relative;
}

@keyframes modalScale {
  from { opacity: 0; transform: scale(0.9); }
  to { opacity: 1; transform: scale(1); }
}

.modal-left {
  flex: 1;
  display: none;
  background-size: cover;
  background-position: center;
}

@media (min-width: 768px) {
  .modal-left {
    display: block;
  }
}

.modal-right {
  flex: 1;
  padding: 32px 24px;
  position: relative;
}

.modal-close {
  position: absolute;
  top: 20px;
  right: 20px;
  font-size: 24px;
  color: #999;
  cursor: pointer;
  z-index: 10;
  transition: color 0.2s;
}

.modal-close:hover {
  color: var(--text-primary);
}

.form-badge {
  display: inline-block;
  background: #E8EEFF;
  color: #3F6AD8;
  padding: 6px 16px;
  border-radius: 50px;
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 24px;
  text-transform: uppercase;
}

.popup-form .form-group {
  margin-bottom: 16px;
}

.popup-form input, 
.popup-form select {
  width: 100%;
  padding: 14px 16px;
  border: 1px solid #E1E6F0;
  border-radius: 8px;
  font-size: 15px;
  transition: all 0.2s;
  background: #fff;
}

.popup-form input:focus, 
.popup-form select:focus {
  border-color: #3F6AD8;
  outline: none;
  box-shadow: 0 0 0 3px rgba(63, 106, 216, 0.1);
}

.popup-form .error-msg {
  color: var(--danger);
  font-size: 12px;
  margin-top: 4px;
  display: none;
}

.submit-btn {
  width: 100%;
  background: #2563EB;
  color: #fff;
  border: none;
  padding: 16px;
  border-radius: 8px;
  font-weight: 700;
  font-size: 16px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: all 0.2s;
}

.submit-btn:hover {
  background: #1D4ED8;
  transform: translateY(-1px);
}

.submit-btn:disabled {
  background: #94A3B8;
  cursor: not-allowed;
}

/* Modal specific print styles */
@media print {
  .modal-overlay {
    display: none !important;
  }
}

/* Special Editor Blocks */
.mcq-block {
    border: 1px dashed var(--input-border);
    background: #f9f9f9;
    padding: 20px 24px;
    border-left: 4px solid var(--primary);
    margin: 16px 0;
    border-radius: 4px;
}
.mcq-block ol {
    margin: 0;
    padding-left: 0;
    list-style-position: inside;
}

.mcq-block li {
    margin-bottom: 8px;
}

.question-block {
    background: #f0f4f8;
    padding: 16px;
    border-left: 4px solid var(--primary);
    margin: 16px 0;
    border-radius: 4px;
}

.section-header-block {
    border-bottom: 2px solid var(--text-primary);
    padding-bottom: 8px;
    font-family: var(--font-heading);
    font-weight: 600;
    text-transform: uppercase;
    background: #333;
    color: white;
    padding: 8px 16px;
    display: inline-block;
    margin-top: 20px;
    border-radius: 4px;
}

.answer-box-block {
    background: #e8f5e9;
    padding: 12px;
    border: 1px dashed #2e7d32;
    margin: 12px 0;
    border-radius: 4px;
}

.tip-box-block {
    font-style: italic;
    background: #fffde7;
    padding: 12px;
    border: 1px solid #fbc02d;
    margin: 12px 0;
    border-radius: 4px;
}