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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #f7f9fc;
    color: #333;
    line-height: 1.6;
    padding-top: 90px; /* To avoid overlap with fixed header */
}

/* Header */
header {
    position: fixed;
    top: 0;
    right: 0;
    width: 100%;
    background: #fff;
    padding: 1rem 2rem;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
    transition: all 0.3s ease;
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo img {
    height: 40px;
    transition: transform 0.3s ease;
}

.logo img:hover {
    transform: scale(1.1);
}

.logo h1 {
    font-size: 2rem;
    font-weight: bold;
    color: rgb(0, 94, 255);
    transition: color 0.3s ease;
}

/* Nav container */
nav {
    position: relative;
    display: flex;
    align-items: center;
}

/* Nav menu (desktop) */
.nav-menu {
    list-style: none;
    display: flex;
    flex-direction: row;
    gap: 1.5rem;
    transition: max-height 0.3s ease, opacity 0.3s ease;
    align-items: center;
}

.nav-menu li {
    display: inline-block;
}

.nav-menu a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    transition: 0.3s;
    position: relative;
}

.nav-menu a:hover {
    background-color: rgba(0, 94, 255, 0.1);
    color: rgb(0, 94, 255);
}

/* Nav toggle (hamburger) */
.nav-toggle:hover {
    background-color: rgba(0, 94, 255, 0.1);
    color: rgb(0, 94, 255);
}

/* Settings menu */
.settings-menu {
    position: relative;
}

.settings-menu i {
    cursor: pointer;
    font-size: 1.4rem;
    color: #000;
    user-select: none;
    padding: 0.5rem;
    border-radius: 5px;
    transition: all 0.3s ease;
}

.settings-menu i:hover {
    background-color: rgba(0, 94, 255, 0.1);
    color: rgb(0, 94, 255);
    transform: rotate(180deg);
}

/* Settings dropdown */
.settings-dropdown {
    position: absolute;
    top: 30px;
    right: 0;
    background: white;
    border: 1px solid #ccc;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    list-style: none;
    padding: 0.5rem 0;
    min-width: 130px;
    display: none;
    z-index: 1001;
    text-align: center;
    transition: all 0.3s ease;
}

.settings-dropdown li {
    padding: 0.5rem 1rem;
}
      
  /* -------------------- DARK MODE START -------------------- */
body.dark-mode {
  background-color: #121212;
  color: #e0e0e0;
  transition: background 0.3s ease, color 0.3s ease;
}

body.dark-mode header {
  background-color: #1e1e1e;
  color: #ffffff;
  box-shadow: 0 2px 6px rgba(255, 255, 255, 0.1);
}

body.dark-mode .nav-menu li a {
  color: #eee !important;
}

body.dark-mode .nav-menu li a::after {
  background: #4c9aff;
}

body.dark-mode .logo-text {
  color: #66aaff;
}

body.dark-mode .kid-mode-button {
  background: linear-gradient(45deg, #e96443, #904e95);
  color: #fff !important;
  box-shadow: 0 0 12px rgba(255, 255, 255, 0.2);
}

body.dark-mode .kid-mode-button:hover {
  background: linear-gradient(45deg, #904e95, #e96443);
}

body.dark-mode .topic-card {
  background-color: #1f1f1f;
  color: #ddd;
  border: 1px solid #333;
  box-shadow: 0 2px 8px rgba(0,0,0,0.5);
}

body.dark-mode .topic-card h3,
body.dark-mode .topic-card p {
  color: #fff !important;
}

body.dark-mode .topic-card:hover {
  box-shadow: 0 10px 20px rgba(255, 255, 255, 0.1);
  background-color: #262626;
}

body.dark-mode .search-section {
  background: #1b1b1b;
  border-radius: 10px;
  padding: 5rem;
}

body.dark-mode #searchInput {
  background-color: #2b2b2b;
  color: #eee;
  border: 1px solid #555;
}

body.dark-mode #searchInput::placeholder {
  color: #aaa;
}

body.dark-mode #searchButton {
  background-color: #333;
  color: #eee;
  border: 1px solid #555;
}

body.dark-mode #searchButton:hover {
  background: #555;
  box-shadow: 0 0 10px rgba(255,255,255,0.2);
}

body.dark-mode .chat-window {
  background-color: #1c1c1c;
  
}

body.dark-mode .user-message {
  background: #31465b;
  color: #fff;
}

body.dark-mode .ai-message {
  background: #292929;
  color: #ddd;
}

body.dark-mode .chat-input-container {
  background-color: #1e1e1e;
  border-top: 1px solid #333;
}

body.dark-mode #userInput {
  background: #2a2a2a;
  color: #fff;
  border: 1px solid #444;
}

body.dark-mode #sendBtn {
  background: #3a3a3a;
  color: #fff;
}

body.dark-mode #sendBtn:hover {
  background: #4a4a4a;
}

body.dark-mode footer {
  background: #0d0d0d;
  color: #aaa;
  box-shadow: 0 -2px 10px rgba(255,255,255,0.1);
}

body.dark-mode #contact {
  background-color: #101010 !important;
  color: #ccc;
}

body.dark-mode #contact nav a {
  color: #bbb !important;
}

body.dark-mode #contact nav a:hover {
  color: #66aaff !important;
}

body.dark-mode .nav-toggle-img {
  filter: brightness(5);
}

body.dark-mode .ai-avatar {
  background: #333;
  box-shadow: 0 0 10px rgba(255,255,255,0.1);
}

body.dark-mode .clear-chat-btn {
  color: #ccc;
}

body.dark-mode .clear-chat-btn:hover {
  background: #330000;
  color: #ff4c4c;
}

body.dark-mode .chat-bubble {
  background: #222;
  color: #eee;
  box-shadow: 0 1px 3px rgba(255,255,255,0.05);
}

body.dark-mode .chat-bubble.user {
  background: linear-gradient(90deg, #1f2f57, #31465b);
  color: #fff;
}

body.dark-mode .chat-bubble.ai {
  background: #292929;
  color: #eee;
  border-left: 5px solid #3c6fff;
}

body.dark-mode .copy-btn {
  background: #555;
  color: #eee;
}

body.dark-mode .copy-btn:hover {
  background: #777;
}

body.dark-mode .settings-dropdown {
  background-color: #222;
  border: 1px solid #444;
}

body.dark-mode .settings-dropdown li a {
  color: #ccc;
}

body.dark-mode .settings-dropdown li a:hover {
  background: #333;
  color: #66aaff;
}

body.dark-mode .ai-title {
  color: #4ca3ff;
}

body.dark-mode .ai-loading-spinner {
  border-top: 4px solid #66aaff;
  border-color: #333 #333 #333 #66aaff;
}

body.dark-mode .recommended-topics h2,
body.dark-mode .search-section h2,
body.dark-mode #contact h2 {
  color: #4ca3ff;
}

body.dark-mode .topic-card::after {
  background: linear-gradient(45deg, #0d6efd, #e83e8c, #ff9800, #0d6efd);
}

body.dark-mode .chat-input-bar input[type="text"] {
  background-color: #2e2e2e;
  border-color: #444;
  color: #eee;
}

body.dark-mode .chat-input-bar input[type="text"]:focus {
  background: #1f1f1f;
  border-color: #66aaff;
}

body.dark-mode .send-btn {
  background: #0056b3;
  color: white;
}

body.dark-mode .send-btn:hover {
  background: #007bff;
}


body.dark-mode .chat-header {
  background: linear-gradient(90deg, #002f4b, #005c97);
}

body.dark-mode .message {
  color: #ddd;
}

body.dark-mode #darkModeToggle {
  background: #ffffff;
  color: #ffffff;
  border: 1px solid #555;
  transition: 0.3s;
}

body.dark-mode #darkModeToggle:hover {
  background: #222;
  box-shadow: 0 0 10px rgba(255,255,255,0.2);
}

body.dark-mode section {
  background: transparent;
}

body.dark-mode .ai-label {
  color: #4ca3ff;
}

body.dark-mode .user-label {
  color: #66aaff;
}

/* Animations for dark mode */
body.dark-mode .topic-card {
  transition: background 0.3s ease, box-shadow 0.3s ease, transform 0.3s ease;
}

body.dark-mode .nav-menu li a::before {
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
}

body.dark-mode .nav-menu li a:hover {
  color: #66aaff !important;
}

body.dark-mode ::selection {
  background: #66aaff;
  color: #000;
}

body.dark-mode::-webkit-scrollbar {
  width: 8px;
}

body.dark-mode::-webkit-scrollbar-track {
  background: #1e1e1e;
}

body.dark-mode::-webkit-scrollbar-thumb {
  background: #555;
  border-radius: 4px;
}

body.dark-mode::-webkit-scrollbar-thumb:hover {
  background: #777;
}
body.dark-mode header {
  background-color: #0d0d0d !important;
  color: #ffffff !important;
  border-bottom: 1px solid #333;
}
body.dark-mode .settings-menu i {
  color: #ccc !important;
  transition: transform 0.3s ease, color 0.3s ease;
}

body.dark-mode .settings-menu i:hover {
  color: #4ca3ff !important;
  transform: rotate(180deg);
}
/* Fancy fume-to-line nav link effect (dark mode only) */
body.dark-mode .nav-menu li a {
  position: relative;
  color: #e0e0e0;
  font-weight: 600;
  transition: color 0.4s ease;
  z-index: 1;
}

body.dark-mode .nav-menu li a::before,
body.dark-mode .nav-menu li a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 0.4s ease, opacity 0.4s ease;
}

body.dark-mode .nav-menu li a::before {
  height: 160%;
  top: -30%;
  background: radial-gradient(closest-side, rgba(255, 255, 255, 0.08), transparent);
  filter: blur(10px);
  opacity: 1;
  z-index: -1;
}

body.dark-mode .nav-menu li a::after {
  background: linear-gradient(to right, #66ccff, #3399ff);
  height: 2px;
  z-index: 2;
}

body.dark-mode .nav-menu li a:hover::before {
  opacity: 0;
}

body.dark-mode .nav-menu li a:hover::after {
  transform: scaleX(1);
}
/* Dark mode styles for search bar */
body.dark-mode #searchInput {
  background-color: #1e1e1e;
  color: #eee;
  border: 1px solid #444;
  padding: 0.6rem 1rem;
  border-radius: 6px;
}

body.dark-mode #searchInput::placeholder {
  color: #aaa;
}

body.dark-mode #searchInput:focus {
  border-color: #66aaff;
  outline: none;
  box-shadow: 0 0 8px rgba(102, 170, 255, 0.3);
}

/* Search button in dark mode */
body.dark-mode #searchButton {
  background-color: #333;
  color: #fff;
  border: 1px solid #555;
  border-radius: 6px;
  padding: 0.6rem 1.2rem;
  transition: background 0.3s ease, box-shadow 0.3s ease;
}

body.dark-mode #searchButton:hover {
  background-color: #444;
  box-shadow: 0 0 10px rgba(102, 170, 255, 0.4);
}
/* Search results container */
body.dark-mode #searchResults {
  background: transparent;
  color: #e0e0e0;
}

/* Individual result card */
body.dark-mode .search-result {
  background: #1e1e1e;
  border-left: 5px solid #4ca3ff;
  box-shadow: 0 4px 16px rgba(255, 255, 255, 0.05);
}

/* Title link */
body.dark-mode .search-result a {
  color: #66ccff !important;
}

body.dark-mode .search-result a:hover {
  color: #9c4be7 !important;
}

/* Description text */
body.dark-mode .search-result p {
  color: #ccc;
}

/* Subtopic label */
body.dark-mode .search-result span[style*='background'] {
  background: #2a2a2a !important;
  color: #66ccff !important;
}

/* "Ask AI" button in dark mode */
body.dark-mode #askAIButton {
  background: linear-gradient(90deg, #5A65EA, #9C4BE7);
  color: #fff;
  border: none;
}

body.dark-mode #askAIButton:hover {
  filter: brightness(1.1);
}

/* === Dark Mode Manual Toggle === */
body.dark-mode {
  background: #000;
  color: #e2e8f0;
}

/* Buttons */
body.dark-mode #askAIButton {
  background: linear-gradient(90deg,#3b82f6,#8b5cf6);
  color: #fff;
  border: none;
}
body.dark-mode #askAIButton:hover {
  filter: brightness(1.1);
}

/* Planner */
body.dark-mode #planner {
  background: #000;
  color: #f1f5f9;
  border-radius: 0.6rem;
}

/* Chat Section */
body.dark-mode .chat-app-card {
  background: #000;
  border: 1px solid #334155;
  color: #f1f5f9;
}
body.dark-mode .chat-window {
  background: #000;
}
body.dark-mode .ai-message {
  background: #334155;
  color: #f8fafc;
}
body.dark-mode .chat-input-container {
  background: #1e293b;
  border-top: 1px solid #334155;
}
body.dark-mode .chat-input-container input {
  background: #000;
  color: #f8fafc;
  border: 1px solid #475569;
}
body.dark-mode .chat-input-container button {
  background: #3b82f6;
  color: #fff;
}

/* Stat Cards */
body.dark-mode .stat-card {
  background: #000;
  border: 1px solid #334155;
  color: #f8fafc;
}

/* Subjects Grid */
body.dark-mode .subjects-grid .subject-card {
  background: #000;
  border: 1px solid #334155;
  color: #e2e8f0;
}

/* Modals */
body.dark-mode .modal-content,
body.dark-mode .alert-content,
body.dark-mode .congrats-content {
  background: #1e293b;
  color: #f1f5f9;
  border: 1px solid #334155;
}
body.dark-mode .modal-title,
body.dark-mode .modal-subtitle {
  color: #f8fafc;
}
body.dark-mode .form-label {
  color: #e2e8f0;
}
body.dark-mode .form-select,
body.dark-mode #modalSubjectName,
body.dark-mode #modalChapters {
  background: #000;
  color: #f1f5f9;
  border: 1px solid #475569;
}
body.dark-mode .btn-cancel {
  background: #000;
  color: #e2e8f0;
}
body.dark-mode .btn-confirm {
  background: #3b82f6;
  color: #fff;
}
/* -------------------- DARK MODE END -------------------- */

@media (max-width: 828px) {
.stats-bar{
  display: none;
}
}
        /* Navigation and Kid Mode Button styles */
        .nav-menu {
            list-style: none;
            margin: 0;
            padding: 0;
            display: flex;
            align-items: center;
            gap: 3.5rem;
        }

        .nav-menu li {
            padding: 0;
            margin: 0;
        }

        .nav-menu li a {
            text-decoration: none;
            color: inherit;
            padding: 0.5rem 0;
            position: relative;
            transition: color 0.3s ease;
        }

        .nav-menu li a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: #195acd;
            transition: width 0.3s ease;
        }

        .nav-menu li a:hover::after {
            width: 100%;
        }



.settings-dropdown li a {
    color: #333;
    text-decoration: none;
    display: block;
    transition: all 0.3s ease;
}

.settings-dropdown li a:hover {
    background-color: #f0f0f0;
    color: rgb(0, 94, 255);
}

.settings-dropdown li a#logoutLink {
    color: red;
}

.settings-dropdown li a#logoutLink:hover {
    background-color: #ffebee;
    color: #d32f2f;
}

.settings-dropdown.show {
    display: block;
    animation: fadeInDown 0.3s ease;
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Footer */
footer {
    width: 100%;
    padding: 20px 0;
    font-family: 'Franklin Gothic Medium', 'Arial Narrow', Arial, sans-serif;
    text-align: center;
    background: #fff;
    border-top: 1px solid #e3e8f0;
}

/* Kid mode button */
.kid-mode-btn {
    background: linear-gradient(45deg, #ff2200, #ff769d, #e5b397);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 25px;
    font-weight: bold;
    cursor: pointer;
    margin-top: 0px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
    transition: all 0.3s ease;
    animation: pulse 2s infinite;
    display: flex;
    align-items: center;
    font-size: 1rem;
    text-decoration: none;
}

.kid-mode-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0,0,0,0.3);
}

.kid-mode-btn i {
    margin-right: 8px;
    font-size: 1.2rem;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

/* Off-canvas menu container */
.offcanvas-menu {
    position: fixed;
    top: 0;
    right: -300px;
    width: 300px;
    height: 100%;
    background-color: white;
    box-shadow: -2px 0 8px rgba(0,0,0,0.15);
    z-index: 1500;
    transition: right 0.3s ease;
    padding: 2rem 1rem;
}

/* When menu is open */
.offcanvas-menu.open {
    right: 0;
}

/* Close button inside menu */
.close-btn {
    position: absolute;
    top: 1rem;
    right: 1rem;
    font-size: 2rem;
    background: none;
    border: none;
    cursor: pointer;
    color: #333;
    transition: all 0.3s ease;
}

.close-btn:hover {
    color: rgb(0, 94, 255);
    transform: scale(1.1);
}

/* Off-canvas nav list */
.offcanvas-menu ul {
    list-style: none;
    margin-top: 60px;
    padding: 0;
}

.offcanvas-menu li {
    margin: 1.5rem 0;
    text-align: left;
}

.offcanvas-menu a {
    text-decoration: none;
    color: #333;
    font-size: 1.2rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.offcanvas-menu a:hover {
    color: rgb(0, 94, 255);
    padding-left: 10px;
}

/* Comprehensive Responsive Design */

/* Large Desktop (1200px and up) */
@media (min-width: 1200px) {
    header {
        padding: 1.2rem 3rem;
    }
    
    .logo h1 {
        font-size: 2.2rem;
    }
    
    .nav-menu {
        gap: 2rem;
    }
    
    .nav-menu a {
        padding: 0.6rem 1.2rem;
        font-size: 1.1rem;
    }
}

/* Desktop (992px - 1199px) */
@media (max-width: 1199px) and (min-width: 992px) {
    header {
        padding: 1rem 2rem;
    }
    
    .nav-menu {
        gap: 1.5rem;
    }
    
    .nav-menu a {
        padding: 0.5rem 1rem;
        font-size: 1rem;
    }
}

/* Tablet Landscape (768px - 991px) */
@media (max-width: 991px) and (min-width: 768px) {
    header {
        padding: 0.8rem 1.5rem;
    }
    
    .logo h1 {
        font-size: 1.8rem;
    }
    
    .logo img {
        height: 35px;
    }
    
    .nav-menu {
        gap: 1.2rem;
    }
    
    .nav-menu a {
        padding: 0.4rem 0.8rem;
        font-size: 0.95rem;
    }
    
    .kid-mode-btn {
        padding: 6px 12px;
        font-size: 0.9rem;
    }
    
    .kid-mode-btn i {
        font-size: 1rem;
        margin-right: 6px;
    }
}

/* Tablet Portrait (600px - 767px) */
@media (max-width: 767px) and (min-width: 600px) {
    header {
        padding: 0.7rem 1.2rem;
    }
    
    .logo h1 {
        font-size: 1.6rem;
    }
    
    .logo img {
        height: 32px;
    }
    
    .nav-menu {
        gap: 1rem;
    }
    
    .nav-menu a {
        padding: 0.3rem 0.7rem;
        font-size: 0.9rem;
    }
    
    .kid-mode-btn {
        padding: 5px 10px;
        font-size: 0.85rem;
    }
    
    .kid-mode-btn i {
        font-size: 0.9rem;
        margin-right: 5px;
    }
}

/* Mobile Large (480px - 599px) */
@media (max-width: 599px) and (min-width: 480px) {
    header {
        padding: 0.6rem 1rem;
    }
    
    .logo h1 {
        font-size: 1.4rem;
    }
    
    .logo img {
        height: 30px;
    }
    
    .nav-menu {
        gap: 0.8rem;
    }
    
    .nav-menu a {
        padding: 0.25rem 0.6rem;
        font-size: 0.85rem;
    }
    
    .kid-mode-btn {
        padding: 4px 8px;
        font-size: 0.8rem;
    }
    
    .kid-mode-btn i {
        font-size: 0.8rem;
        margin-right: 4px;
    }
}

/* Mobile Small (320px - 479px) */
@media (max-width: 479px) {
    header {
        padding: 0.5rem 0.8rem;
    }
    
    .logo h1 {
        font-size: 1.2rem;
    }
    
    .logo img {
        height: 28px;
    }
    
    .nav-menu {
        gap: 0.6rem;
    }
    
    .nav-menu a {
        padding: 0.2rem 0.5rem;
        font-size: 0.8rem;
    }
    
    .kid-mode-btn {
        padding: 3px 6px;
        font-size: 0.75rem;
    }
    
    .kid-mode-btn i {
        font-size: 0.75rem;
        margin-right: 3px;
    }
    
    .settings-menu i {
        font-size: 1.2rem;
        padding: 0.3rem;
    }
}

/* Extra Small Mobile (below 320px) */
@media (max-width: 319px) {
    header {
        padding: 0.4rem 0.6rem;
    }
    
    .logo h1 {
        font-size: 1rem;
    }
    
    .logo img {
        height: 24px;
    }
    
    .nav-menu {
        gap: 0.4rem;
    }
    
    .nav-menu a {
        padding: 0.15rem 0.4rem;
        font-size: 0.75rem;
    }
    
    .kid-mode-btn {
        padding: 2px 4px;
        font-size: 0.7rem;
    }
    
    .kid-mode-btn i {
        font-size: 0.7rem;
        margin-right: 2px;
    }
    
    .settings-menu i {
        font-size: 1rem;
        padding: 0.2rem;
    }
}

/* Mobile Navigation Styles */
@media (max-width: 880px) {
    .logo-text {
        display: none;
    }


    @keyframes slideIn {
        from { transform: translateX(100%); opacity: 0; }
        to { transform: translateX(0); opacity: 1; }
    }

}

/* Landscape Orientation Adjustments */
@media (max-height: 500px) and (orientation: landscape) {
    header {
        padding: 0.4rem 1rem;
    }
    
    .logo h1 {
        font-size: 1.2rem;
    }
    
    .logo img {
        height: 24px;
    }
    
    .nav-menu a {
        padding: 0.2rem 0.5rem;
        font-size: 0.8rem;
    }
    
    .kid-mode-btn {
        padding: 3px 6px;
        font-size: 0.75rem;
    }
}

/* Optional: Smooth scroll */
html {
    scroll-behavior: smooth;
}