/*
 * Math By Anoop - Main Styling Sheet
 */

/* --- GENERAL RESET & BASE --- */
* {
  box-sizing: border-box;
}

body {
  font-family: var(--font-body);
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* App Container */
.container {
  max-width: 1200px;
  width: 92%;
  margin: 0 auto;
  padding: 24px 0;
}

/* --- APP HEADER (STICKY NAVIGATION) --- */
.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(33, 29, 26, 0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--chalk-line);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.25);
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 0;
}

.brand-link {
  display: flex;
  align-items: center;
  text-decoration: none;
  gap: 12px;
}

.brand-logo {
  height: 38px;
  width: auto;
  border-radius: 6px;
  border: 1px solid var(--accent);
}

.brand-logo-fallback {
  width: 38px;
  height: 38px;
  background-color: var(--accent);
  color: var(--board-2);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 20px;
  box-shadow: inset 0 0 5px rgba(0,0,0,0.3);
}

.brand-name {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 22px;
  color: var(--chalk);
  margin: 0;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 16px;
}

.user-profile {
  display: flex;
  align-items: center;
  gap: 10px;
}

.user-name {
  color: var(--chalk-dim);
  font-size: 14px;
  font-weight: 500;
}

.role-badge {
  background-color: var(--accent-soft);
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 3px 8px;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.role-badge.student {
  background-color: rgba(242, 239, 233, 0.08);
  color: var(--chalk-dim);
  border: 1px solid rgba(242, 239, 233, 0.2);
}

/* --- BUTTONS --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 14px;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  border: none;
  outline: none;
}

.btn-primary {
  background-color: var(--accent);
  color: var(--board-2);
  box-shadow: 0 4px 15px rgba(201, 162, 75, 0.3);
}

.btn-primary:hover {
  background-color: #dcb35c;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(201, 162, 75, 0.4);
}

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

.btn-secondary {
  background-color: rgba(242, 239, 233, 0.06);
  color: var(--chalk);
  border: 1px solid rgba(242, 239, 233, 0.2);
}

.btn-secondary:hover {
  background-color: rgba(242, 239, 233, 0.12);
  border-color: var(--chalk-dim);
  transform: translateY(-2px);
}

.btn-danger {
  background-color: var(--danger);
  color: var(--chalk);
  box-shadow: 0 4px 15px rgba(195, 107, 92, 0.3);
}

.btn-danger:hover {
  background-color: #d17c6e;
  transform: translateY(-2px);
}

.btn-sm {
  padding: 6px 12px;
  font-size: 12px;
  border-radius: 6px;
}

.btn-icon {
  padding: 8px;
  border-radius: 50%;
  aspect-ratio: 1;
}

/* --- HERO BOARD PANEL --- */
.hero-board {
  margin-bottom: 32px;
  padding: 32px;
  min-height: 260px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.hero-content {
  flex: 1;
  max-width: 60%;
}

.hero-title {
  font-size: 38px;
  margin: 0 0 12px 0;
  line-height: 1.2;
}

.hero-tagline {
  font-size: 18px;
  color: var(--chalk-dim);
  margin: 0 0 20px 0;
  font-weight: 300;
}

.hero-doodle {
  width: 250px;
  height: auto;
  opacity: 0.15;
  pointer-events: none;
}

.hero-animation-container {
  width: 320px;
  height: 240px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: rgba(0, 0, 0, 0.15);
  border-radius: var(--radius-sm);
  border: 1px dashed var(--chalk-line);
}

/* --- CARDS GRID & CARDS --- */
.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
  margin-bottom: 40px;
}

.action-card {
  background-color: var(--board);
  border: 1px solid rgba(242, 239, 233, 0.08);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.2);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  overflow: hidden;
}

.action-card::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: transparent;
  transition: var(--transition);
}

.action-card:hover {
  transform: translateY(-6px);
  border-color: rgba(201, 162, 75, 0.3);
  box-shadow: var(--shadow);
}

.action-card:hover::after {
  background: var(--accent);
}

.card-header-icon {
  margin-bottom: 16px;
  color: var(--accent);
}

.card-header-icon svg {
  stroke-width: 1.5;
}

.card-title {
  font-size: 20px;
  margin: 0 0 8px 0;
}

.card-desc {
  font-size: 14px;
  color: var(--chalk-dim);
  margin: 0 0 20px 0;
  line-height: 1.5;
}

.card-meta {
  font-size: 13px;
  color: var(--chalk-dim);
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: auto;
  margin-bottom: 16px;
}

/* --- TABS SYSTEM --- */
.tabs-navigation {
  display: flex;
  border-bottom: 2px solid var(--chalk-line);
  margin-bottom: 24px;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 2px;
}

.tab-btn {
  background: none;
  border: none;
  outline: none;
  color: var(--chalk-dim);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 14px;
  padding: 12px 20px;
  cursor: pointer;
  transition: var(--transition);
  border-bottom: 3px solid transparent;
  white-space: nowrap;
}

.tab-btn:hover {
  color: var(--chalk);
}

.tab-btn.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.tab-content {
  display: none;
  animation: fadeIn 0.4s ease;
}

.tab-content.active {
  display: block;
}

/* --- FORMS & INPUTS --- */
.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--chalk-dim);
  margin-bottom: 8px;
}

.form-input {
  width: 100%;
  background-color: rgba(0, 0, 0, 0.25);
  border: 1px solid rgba(242, 239, 233, 0.15);
  color: var(--chalk);
  font-family: var(--font-body);
  font-size: 14px;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  outline: none;
  transition: var(--transition);
}

.form-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
  background-color: rgba(0, 0, 0, 0.4);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

select.form-input {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%23C9C3B8'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  background-size: 16px;
  padding-right: 40px;
}

/* --- LOGIN SCREEN SPECIFICS --- */
.login-body {
  background-color: var(--slate-bg);
  background-image: radial-gradient(var(--slate-deep) 1px, transparent 1px);
  background-size: 24px 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  margin: 0;
  padding: 20px;
}

.login-card {
  width: 100%;
  max-width: 440px;
  padding: 40px;
}

.login-logo-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-bottom: 32px;
  text-align: center;
}

.login-logo {
  height: 60px;
  width: auto;
  margin-bottom: 12px;
  border-radius: 8px;
  border: 2px solid var(--accent);
}

.login-title {
  font-size: 28px;
  margin: 0 0 6px 0;
}

.login-subtitle {
  color: var(--chalk-dim);
  font-size: 14px;
  margin: 0;
  font-weight: 300;
}

/* --- TABLES & REPORT CARDS --- */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(242, 239, 233, 0.08);
  background-color: var(--board);
  margin-bottom: 24px;
}

.custom-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 14px;
}

.custom-table th {
  background-color: rgba(0, 0, 0, 0.3);
  color: var(--chalk);
  font-weight: 600;
  padding: 14px 20px;
  border-bottom: 1px solid rgba(242, 239, 233, 0.15);
}

.custom-table td {
  padding: 14px 20px;
  border-bottom: 1px solid rgba(242, 239, 233, 0.06);
  color: var(--chalk-dim);
  vertical-align: middle;
}

.custom-table tr:hover td {
  background-color: rgba(242, 239, 233, 0.03);
  color: var(--chalk);
}

/* Ranks styling */
.rank-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  font-weight: 700;
  font-size: 12px;
  background-color: rgba(242, 239, 233, 0.08);
  color: var(--chalk-dim);
}

.rank-badge.rank-1 {
  background-color: #D4AF37; /* Gold */
  color: #211D1A;
  box-shadow: 0 0 10px rgba(212, 175, 55, 0.4);
}

.rank-badge.rank-2 {
  background-color: #C0C0C0; /* Silver */
  color: #211D1A;
}

.rank-badge.rank-3 {
  background-color: #CD7F32; /* Bronze */
  color: #211D1A;
}

.highlight-row td {
  background-color: rgba(201, 162, 75, 0.08) !important;
  color: var(--chalk) !important;
  border-top: 1px solid var(--accent-soft);
  border-bottom: 1px solid var(--accent-soft);
}

/* --- ATTENDANCE HISTORY LIST --- */
.attendance-timeline {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-height: 350px;
  overflow-y: auto;
  padding-right: 8px;
}

.attendance-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: rgba(0,0,0,0.15);
  border: 1px solid rgba(242, 239, 233, 0.05);
  padding: 12px 16px;
  border-radius: var(--radius-sm);
}

/* Custom Scrollbars */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: var(--board-2);
}

::-webkit-scrollbar-thumb {
  background: var(--bronze-light);
  border-radius: 3px;
}

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

/* --- WHATSAPP FAB BUTTON --- */
.whatsapp-fab {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 56px;
  height: 56px;
  background-color: var(--accent);
  color: var(--board-2);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.35);
  cursor: pointer;
  z-index: 1000;
  transition: var(--transition);
  text-decoration: none;
  animation: fabBounce 3s infinite ease-in-out;
}

.whatsapp-fab:hover {
  transform: scale(1.1);
  background-color: #dcb35c;
  box-shadow: 0 6px 25px rgba(201, 162, 75, 0.5);
}

.whatsapp-fab svg {
  width: 28px;
  height: 28px;
  fill: currentColor;
}

@keyframes fabBounce {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-8px);
  }
}

/* --- TOAST NOTIFICATIONS --- */
.toast-container {
  position: fixed;
  top: 24px;
  right: 24px;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 12px;
  pointer-events: none;
}

.toast {
  background-color: var(--board);
  color: var(--chalk);
  border-left: 4px solid var(--accent);
  padding: 16px 24px;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 280px;
  max-width: 400px;
  animation: slideIn 0.3s cubic-bezier(0.4, 0, 0.2, 1) forwards;
  pointer-events: auto;
}

.toast.toast-success {
  border-left-color: var(--success);
}

.toast.toast-error {
  border-left-color: var(--danger);
}

/* --- MODALS --- */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(4px);
  z-index: 1500;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal-overlay.active {
  display: flex;
  animation: fadeIn 0.3s ease;
}

.modal-box {
  width: 100%;
  max-width: 500px;
  padding: 32px;
  position: relative;
}

.modal-close {
  position: absolute;
  top: 20px;
  right: 20px;
  background: none;
  border: none;
  color: var(--chalk-dim);
  font-size: 24px;
  cursor: pointer;
  transition: var(--transition);
}

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

/* --- LOADERS & SPINNERS --- */
.loader-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(33, 29, 26, 0.8);
  backdrop-filter: blur(4px);
  z-index: 3000;
  display: none;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 16px;
}

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

.spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--chalk-line);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 1s infinite linear;
}

.loader-text {
  font-family: var(--font-head);
  font-style: italic;
  font-size: 16px;
  color: var(--chalk-dim);
}

/* --- EXAM WRAPPERS --- */
.exam-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 32px;
}

.exam-main {
  flex: 1;
}

.exam-sidebar {
  position: sticky;
  top: 86px;
  align-self: start;
}

.question-card {
  background-color: var(--board);
  border: 1px solid rgba(242, 239, 233, 0.06);
  border-radius: var(--radius);
  padding: 32px;
  margin-bottom: 24px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.question-meta {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 12px;
}

.question-text {
  font-size: 18px;
  line-height: 1.6;
  margin: 0 0 24px 0;
  color: var(--chalk);
}

.options-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.option-item {
  display: flex;
  align-items: center;
  background-color: rgba(0, 0, 0, 0.15);
  border: 1px solid rgba(242, 239, 233, 0.08);
  border-radius: var(--radius-sm);
  padding: 14px 20px;
  cursor: pointer;
  transition: var(--transition);
}

.option-item:hover {
  background-color: rgba(242, 239, 233, 0.04);
  border-color: rgba(242, 239, 233, 0.2);
}

.option-item.selected {
  border-color: var(--accent);
  background-color: rgba(201, 162, 75, 0.05);
}

.option-radio {
  display: none;
}

.option-letter {
  font-weight: 700;
  color: var(--accent);
  margin-right: 16px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 1px solid var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  background-color: rgba(201, 162, 75, 0.1);
  transition: var(--transition);
}

.option-item.selected .option-letter {
  background-color: var(--accent);
  color: var(--board-2);
}

.option-text {
  font-size: 15px;
  color: var(--chalk-dim);
}

.option-item.selected .option-text {
  color: var(--chalk);
}

/* Timer display styling */
.timer-box {
  background-color: var(--board);
  border: 1px solid rgba(242, 239, 233, 0.08);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.timer-value {
  font-family: var(--font-math);
  font-size: 36px;
  font-weight: 700;
  color: var(--accent);
  margin: 12px 0 6px 0;
  letter-spacing: 0.05em;
}

.timer-value.danger {
  color: var(--danger);
  animation: pulseLive 1s infinite;
}

/* --- ANIMATIONS KEYFRAMES --- */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

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

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* --- FOOTER --- */
.app-footer {
  margin-top: auto;
  border-top: 1px solid var(--chalk-line);
  background-color: var(--board-2);
  padding: 24px 0;
  text-align: center;
  font-size: 13px;
  color: var(--chalk-dim);
}

.footer-doodle-line {
  display: block;
  height: 10px;
  margin: 16px auto 0 auto;
  max-width: 150px;
  opacity: 0.15;
}

/* --- RESPONSIVENESS SYSTEM --- */
@media (max-width: 900px) {
  .exam-layout {
    grid-template-columns: 1fr;
  }
  .exam-sidebar {
    position: static;
    margin-bottom: 24px;
  }
}

@media (max-width: 768px) {
  .hero-board {
    flex-direction: column;
    padding: 24px;
    align-items: stretch;
  }
  .hero-content {
    max-width: 100%;
    text-align: center;
  }
  .hero-animation-container {
    width: 100%;
    max-width: 320px;
    margin: 0 auto;
  }
  .header-nav {
    gap: 8px;
  }
  .user-name {
    display: none;
  }
  .form-row {
    grid-template-columns: 1fr;
    gap: 0;
  }
}

/* --- MOBILE FIRST EXTENSIONS & ACCESSIBILITY --- */
@media (max-width: 480px) {
  .container {
    width: 94%;
    padding: 16px 0;
  }
  .hero-title {
    font-size: 28px !important;
  }
  .hero-tagline {
    font-size: 14px !important;
  }
  .board-frame {
    border-width: 8px !important;
    outline-width: 1px !important;
  }
  .btn {
    padding: 12px 18px !important; /* Larger touch coordinates on small screens */
    width: 100%;
  }
  .form-input {
    padding: 14px 16px !important; /* 48px touch guidelines */
  }
}

/* Ensure all buttons, selectors, and form elements fulfill min 48px touch targets for mobile accessibility */
.btn, .form-input, select.form-input, .tab-btn, .class-select-btn {
  min-height: 48px;
}

/* --- PUBLIC BRAND LANDING HERO & USP SECTIONS --- */
.public-hero-board {
  text-align: center;
  min-height: auto;
  padding: 48px 24px;
  flex-direction: column;
  align-items: center;
}

.public-hero-badge {
  background-color: var(--accent-soft);
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 16px;
  display: inline-block;
}

.doodle-divider {
  max-width: 250px;
  margin: 32px auto;
  opacity: 0.15;
}

.usp-section-title {
  text-align: center;
  font-size: 28px;
  margin-bottom: 8px;
}

.usp-section-subtitle {
  text-align: center;
  color: var(--chalk-dim);
  font-size: 15px;
  margin-bottom: 32px;
  font-weight: 300;
}

.usp-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-bottom: 56px;
  perspective: 1000px;
}

.usp-card {
  background-color: rgba(33, 29, 26, 0.8);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(201, 162, 75, 0.12);
  border-radius: var(--radius);
  padding: 24px 20px;
  text-align: center;
  transition: transform 0.15s ease-out, box-shadow 0.3s ease, border-color 0.3s ease;
  box-shadow: 0 10px 30px rgba(0,0,0,0.2);
  position: relative;
  overflow: hidden;
  cursor: pointer;
  transform-style: preserve-3d;
  transform: perspective(1000px) rotateX(var(--rx, 0deg)) rotateY(var(--ry, 0deg));
}

.usp-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at var(--mx, 50%) var(--my, 50%), rgba(201, 162, 75, 0.08) 0%, transparent 60%);
  opacity: 0;
  transition: opacity 0.4s ease;
  pointer-events: none;
  z-index: 1;
}

.usp-card:hover::before {
  opacity: 1;
}

.usp-card:hover {
  border-color: rgba(201, 162, 75, 0.4);
  box-shadow: 0 20px 45px rgba(201, 162, 75, 0.2), 0 0 15px rgba(201, 162, 75, 0.08);
}

.demo-screen {
  width: 100%;
  height: 125px;
  background-color: var(--board-2);
  border: 1px solid rgba(242, 239, 233, 0.08);
  border-radius: 8px;
  margin-bottom: 16px;
  position: relative;
  overflow: hidden;
  font-family: var(--font-body);
  display: flex;
  flex-direction: column;
  box-shadow: inset 0 0 15px rgba(0,0,0,0.6);
  transform: translateZ(10px);
  user-select: none;
}

/* --- LIBRARY MOCKUP DEMO --- */
.lib-demo {
  position: relative;
  width: 100%;
  height: 100%;
  padding: 8px 10px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}
.lib-folder {
  font-size: 10.5px;
  font-weight: 600;
  color: var(--chalk);
  display: flex;
  align-items: center;
  gap: 5px;
  margin-bottom: 2px;
}
.lib-list {
  width: 100%;
  padding-left: 12px;
  display: flex;
  flex-direction: column;
  gap: 3px;
  transform: scaleY(0);
  transform-origin: top;
  animation: folderExpand 7s infinite ease-in-out;
}
.lib-item {
  font-size: 9.5px;
  color: var(--chalk-dim);
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 1px 4px;
  border-radius: 3px;
  border: 1px solid transparent;
}
.lib-item.active {
  animation: itemHighlight 7s infinite ease-in-out;
}
.lib-cursor {
  position: absolute;
  width: 8px;
  height: 8px;
  background-color: #fff;
  border-radius: 50%;
  box-shadow: 0 0 6px #fff;
  pointer-events: none;
  z-index: 10;
  top: 90px;
  left: 80px;
  animation: cursorMoveLibrary 7s infinite ease-in-out;
}
.lib-preview {
  position: absolute;
  top: 4px;
  left: 4px;
  right: 4px;
  bottom: 4px;
  background-color: rgba(33, 29, 26, 0.95);
  border: 1px solid rgba(201, 162, 75, 0.3);
  border-radius: 5px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-size: 10.5px;
  color: var(--chalk);
  opacity: 0;
  transform: scale(0.85);
  transition: all 0.3s ease;
  animation: previewFade 7s infinite ease-in-out;
}

@keyframes folderExpand {
  0%, 15% { transform: scaleY(0); opacity: 0; }
  22%, 75% { transform: scaleY(1); opacity: 1; }
  82%, 100% { transform: scaleY(0); opacity: 0; }
}
@keyframes itemHighlight {
  0%, 35% { background-color: transparent; border-color: transparent; }
  40%, 75% { background-color: rgba(201, 162, 75, 0.12); border-color: rgba(201, 162, 75, 0.3); color: var(--chalk); }
  82%, 100% { background-color: transparent; border-color: transparent; }
}
@keyframes cursorMoveLibrary {
  0% { top: 90px; left: 80px; opacity: 1; }
  12% { top: 10px; left: 20px; }
  15% { top: 10px; left: 20px; transform: scale(0.8); }
  18% { top: 10px; left: 20px; transform: scale(1); }
  30% { top: 34px; left: 40px; }
  35% { top: 34px; left: 40px; transform: scale(0.8); }
  38% { top: 34px; left: 40px; transform: scale(1); }
  42%, 75% { opacity: 0; }
  82% { opacity: 1; top: 90px; left: 80px; }
  100% { top: 90px; left: 80px; }
}
@keyframes previewFade {
  0%, 42% { opacity: 0; transform: scale(0.8); pointer-events: none; }
  48%, 73% { opacity: 1; transform: scale(1); pointer-events: auto; }
  79%, 100% { opacity: 0; transform: scale(0.8); pointer-events: none; }
}

/* --- EXAM MOCKUP DEMO --- */
.exam-demo {
  position: relative;
  width: 100%;
  height: 100%;
  padding: 6px 10px;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  justify-content: space-between;
}
.exam-demo-header {
  display: flex;
  justify-content: space-between;
  font-size: 8px;
  color: var(--chalk-dim);
  border-bottom: 1px solid rgba(242,239,233,0.06);
  padding-bottom: 2px;
}
.exam-demo-timer {
  color: var(--danger);
  font-weight: 700;
  animation: examTimerBlink 1s infinite alternate;
}
@keyframes examTimerBlink {
  from { opacity: 0.5; }
  to { opacity: 1; }
}
.exam-demo-q {
  font-size: 10.5px;
  color: var(--chalk);
  margin-top: 2px;
  font-family: var(--font-math);
  font-style: italic;
  text-align: center;
}
.exam-demo-options {
  display: flex;
  gap: 6px;
  justify-content: center;
  margin-top: 2px;
}
.exam-demo-opt {
  font-size: 8.5px;
  padding: 2px 6px;
  background-color: var(--board);
  border: 1px solid rgba(242,239,233,0.1);
  border-radius: 3px;
  color: var(--chalk-dim);
  transition: all 0.2s ease;
}
.exam-demo-opt.active {
  animation: optSelect 6s infinite ease-in-out;
}
.exam-demo-btn {
  font-size: 8.5px;
  font-weight: 600;
  padding: 3px;
  background-color: var(--accent);
  color: var(--board-2);
  border-radius: 3px;
  text-align: center;
  margin-top: 2px;
  animation: btnClickExam 6s infinite ease-in-out;
}
.exam-demo-cursor {
  position: absolute;
  width: 8px;
  height: 8px;
  background-color: #fff;
  border-radius: 50%;
  box-shadow: 0 0 6px #fff;
  pointer-events: none;
  z-index: 10;
  top: 110px;
  left: 120px;
  animation: cursorMoveExam 6s infinite ease-in-out;
}
.exam-demo-rank {
  position: absolute;
  top: 4px;
  left: 4px;
  right: 4px;
  bottom: 4px;
  background: radial-gradient(circle, var(--board) 0%, var(--board-2) 100%);
  border: 2px solid var(--accent);
  border-radius: 5px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: scale(0.85);
  animation: rankBadgeFade 6s infinite ease-in-out;
  box-shadow: 0 4px 12px rgba(201, 162, 75, 0.2);
}
.rank-star {
  font-size: 16px;
  color: var(--accent);
  animation: starPulse 1.2s infinite alternate;
}

@keyframes optSelect {
  0%, 20% { border-color: rgba(242,239,233,0.1); background-color: var(--board); color: var(--chalk-dim); }
  25%, 70% { border-color: var(--accent); background-color: var(--accent-soft); color: var(--accent); }
  80%, 100% { border-color: rgba(242,239,233,0.1); background-color: var(--board); color: var(--chalk-dim); }
}
@keyframes btnClickExam {
  0%, 38% { background-color: var(--accent); color: var(--board-2); }
  40%, 42% { background-color: #dcb35c; transform: scale(0.96); }
  43%, 70% { background-color: var(--success); color: #fff; transform: scale(1); }
  80%, 100% { background-color: var(--accent); color: var(--board-2); }
}
@keyframes cursorMoveExam {
  0% { top: 110px; left: 120px; opacity: 1; }
  18% { top: 52px; left: 75px; }
  22% { top: 52px; left: 75px; transform: scale(0.8); }
  25% { top: 52px; left: 75px; transform: scale(1); }
  34% { top: 88px; left: 95px; }
  38% { top: 88px; left: 95px; transform: scale(0.8); }
  41% { top: 88px; left: 95px; transform: scale(1); }
  45%, 70% { opacity: 0; }
  75% { opacity: 1; top: 110px; left: 120px; }
  100% { top: 110px; left: 120px; }
}
@keyframes rankBadgeFade {
  0%, 46% { opacity: 0; transform: scale(0.8) rotate(-3deg); }
  52%, 73% { opacity: 1; transform: scale(1) rotate(0deg); }
  79%, 100% { opacity: 0; transform: scale(0.8) rotate(3deg); }
}
@keyframes starPulse {
  from { transform: scale(0.95); }
  to { transform: scale(1.15); }
}

/* --- ATTENDANCE MOCKUP DEMO --- */
.att-demo {
  position: relative;
  width: 100%;
  height: 100%;
  padding: 8px;
  display: flex;
  align-items: center;
  justify-content: space-around;
}
.att-demo-grid {
  display: grid;
  grid-template-columns: repeat(2, 24px);
  grid-template-rows: repeat(2, 24px);
  gap: 5px;
}
.att-demo-cell {
  background-color: var(--board);
  border: 1px dashed rgba(242,239,233,0.15);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  font-weight: 700;
  color: var(--success);
}
.att-demo-cell.checked {
  border-style: solid;
  border-color: rgba(127, 168, 107, 0.4);
  background-color: rgba(127, 168, 107, 0.08);
}
.att-demo-cell.animate-check {
  opacity: 0;
  transform: scale(0.5);
  animation: cellCheckAnimate 7s infinite ease-in-out;
}
.att-demo-panel {
  display: flex;
  flex-direction: column;
  gap: 6px;
  align-items: center;
  width: 100px;
}
.att-demo-btn {
  width: 100%;
  font-size: 7.5px;
  font-weight: 700;
  padding: 5px 3px;
  background-color: var(--accent);
  color: var(--board-2);
  border-radius: 3px;
  text-align: center;
  box-shadow: 0 2px 6px rgba(201,162,75,0.15);
  animation: btnCheckinClick 7s infinite ease-in-out;
}
.att-demo-streak {
  font-size: 8px;
  font-weight: 600;
  color: var(--accent);
  opacity: 0;
  transform: translateY(3px);
  animation: streakReveal 7s infinite ease-in-out;
}
.att-demo-cursor {
  position: absolute;
  width: 8px;
  height: 8px;
  background-color: #fff;
  border-radius: 50%;
  box-shadow: 0 0 6px #fff;
  pointer-events: none;
  z-index: 10;
  top: 90px;
  left: 140px;
  animation: cursorMoveAttendance 7s infinite ease-in-out;
}

@keyframes cellCheckAnimate {
  0%, 32% { border-style: dashed; border-color: rgba(242,239,233,0.15); background-color: var(--board); opacity: 0; transform: scale(0.5); }
  38%, 76% { border-style: solid; border-color: var(--success); background-color: rgba(127, 168, 107, 0.15); opacity: 1; transform: scale(1); }
  84%, 100% { border-style: dashed; border-color: rgba(242,239,233,0.15); background-color: var(--board); opacity: 0; transform: scale(0.5); }
}
@keyframes btnCheckinClick {
  0%, 26% { background-color: var(--accent); color: var(--board-2); transform: scale(1); }
  28%, 30% { background-color: #dcb35c; transform: scale(0.95); }
  31%, 76% { background-color: var(--success); color: #fff; transform: scale(1); }
  84%, 100% { background-color: var(--accent); color: var(--board-2); transform: scale(1); }
}
@keyframes streakReveal {
  0%, 32% { opacity: 0; transform: translateY(3px); }
  38%, 75% { opacity: 1; transform: translateY(0); }
  82%, 100% { opacity: 0; transform: translateY(3px); }
}
@keyframes cursorMoveAttendance {
  0% { top: 90px; left: 140px; opacity: 1; }
  22% { top: 38px; left: 110px; }
  26% { top: 38px; left: 110px; transform: scale(0.8); }
  29% { top: 38px; left: 110px; transform: scale(1); }
  34%, 75% { opacity: 0; }
  82% { opacity: 1; top: 90px; left: 140px; }
  100% { top: 90px; left: 140px; }
}

.usp-title {
  font-size: 18px;
  margin: 0 0 8px 0;
  color: var(--chalk);
  transform: translateZ(15px);
  transition: var(--transition);
}

.usp-card:hover .usp-title {
  color: var(--accent);
  transform: translateZ(25px);
}

.usp-desc {
  font-size: 13px;
  color: var(--chalk-dim);
  line-height: 1.5;
  margin: 0;
  transform: translateZ(10px);
  transition: var(--transition);
}

.usp-card:hover .usp-desc {
  color: var(--chalk);
  transform: translateZ(18px);
}

/* --- GLASSMORPHIC SLIDING OVERLAY MODAL --- */
.glass-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(33, 29, 26, 0.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.glass-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.sliding-modal-box {
  width: 100%;
  max-width: 440px;
  background: rgba(43, 38, 34, 0.95);
  border: 1px solid rgba(242, 239, 233, 0.15);
  border-radius: var(--radius);
  box-shadow: 0 20px 50px rgba(0,0,0,0.5);
  padding: 32px;
  transform: translateY(30px);
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
}

.glass-overlay.active .sliding-modal-box {
  transform: translateY(0);
}

/* --- STUDENT PORTAL COLLAPSIBLE ACCORDION CHAPTERS --- */
.class-selector-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 20px;
  overflow-x: auto;
  padding-bottom: 4px;
}

.class-select-btn {
  background-color: rgba(0, 0, 0, 0.2);
  border: 1px solid rgba(242, 239, 233, 0.1);
  color: var(--chalk-dim);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 13px;
  padding: 10px 18px;
  border-radius: 20px;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

.class-select-btn:hover {
  border-color: var(--accent);
  color: var(--chalk);
}

.class-select-btn.active {
  background-color: var(--accent);
  color: var(--board-2);
  border-color: var(--accent);
  box-shadow: 0 4px 12px rgba(201, 162, 75, 0.3);
}

.chapter-accordion {
  border: 1px solid rgba(242, 239, 233, 0.05);
  border-radius: var(--radius-sm);
  background-color: rgba(0, 0, 0, 0.15);
  margin-bottom: 12px;
  overflow: hidden;
}

.chapter-accordion-header {
  padding: 16px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  transition: var(--transition);
  user-select: none;
}

.chapter-accordion-header:hover {
  background-color: rgba(242, 239, 233, 0.02);
}

.chapter-accordion-header h4 {
  margin: 0;
  font-size: 15px;
  font-family: var(--font-body);
  font-weight: 600;
}

.chapter-accordion-icon {
  transition: transform 0.3s ease;
  color: var(--accent);
}

.chapter-accordion.open .chapter-accordion-icon {
  transform: rotate(180deg);
}

.chapter-accordion-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
  border-top: 0px solid transparent;
  background-color: rgba(0, 0, 0, 0.25);
}

.chapter-accordion.open .chapter-accordion-content {
  max-height: 1000px; /* high value to expand */
  transition: max-height 0.3s cubic-bezier(0.86, 0, 0.07, 1);
  border-top: 1px solid rgba(242, 239, 233, 0.05);
}

.chapter-resource-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 20px;
  border-bottom: 1px solid rgba(242, 239, 233, 0.03);
  font-size: 13px;
}

.chapter-resource-row:last-child {
  border-bottom: none;
}

/* --- INLINE MEDIA PREVIEW OVERLAYS --- */
.preview-overlay-box {
  width: 100%;
  max-width: 720px;
  background-color: var(--board);
  padding: 24px;
}

.preview-media-container {
  width: 100%;
  background-color: #000;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(242, 239, 233, 0.1);
  overflow: hidden;
  margin-bottom: 16px;
}

.video-responsive-wrapper {
  position: relative;
  padding-bottom: 56.25%; /* 16:9 aspect ratio */
  height: 0;
  overflow: hidden;
}

.video-responsive-wrapper iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
}

.document-preview-wrapper {
  width: 100%;
  height: 420px;
}

.document-preview-wrapper iframe {
  width: 100%;
  height: 100%;
  border: none;
}