:root {
    --nairobi-blue: #0066cc;
    --sunset-gold: #ff9900;
    --cloud-white: #ffffff;
    --savannah-green: #2e8b57;
    --acacia-brown: #8b4513;
    --mt-kenya-gray: #708090;
    --text-dark: #333333;
    --text-light: #f8f9fa;
    --background-light: #f5f5f5;
    --border-color: #e0e0e0;
    --footer-bg: #1a1a2e;
}

/* Universal Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Open Sans', sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--cloud-white);
    -webkit-font-smoothing: antialiased; /* Smoother font rendering */
    -moz-osx-font-smoothing: grayscale; /* Smoother font rendering */
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Poppins', sans-serif;
    font-weight: 600;
    color: var(--nairobi-blue); /* Apply brand color to headings */
}

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

ul {
    list-style: none;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 25px; /* Slightly larger for better touch targets */
    border-radius: 8px; /* More modern rounded corners */
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
    text-align: center;
    white-space: nowrap; /* Prevent text wrapping on smaller buttons */
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1); /* Subtle shadow */
}

.btn-primary {
    background-color: var(--nairobi-blue);
    color: var(--cloud-white);
}

.btn-primary:hover {
    background-color: #0052a3;
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15); /* Enhanced hover shadow */
}

.btn-outline {
    background-color: transparent;
    color: var(--nairobi-blue);
    border: 2px solid var(--nairobi-blue);
}

.btn-outline:hover {
    background-color: var(--nairobi-blue);
    color: var(--cloud-white);
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 102, 204, 0.2);
}

/* Header Styles */
header {
    background-color: #2c3e50;
    padding: 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    font-size: 1.6rem; /* Slightly larger logo text */
    font-weight: 700;
    color: var(--cloud-white);
}

.logo-img {
    height: 40px; /* Slightly larger logo image */
    width: auto;
    vertical-align: middle;
    margin-right: 10px; /* Increased margin for better spacing */
    border-radius: 50%; /* Make logo image circular */
}

.logo span {
    background: linear-gradient(45deg, var(--nairobi-blue), var(--sunset-gold));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Desktop Navigation */
.desktop-nav {
    display: block; /* Show by default on desktop */
}

.desktop-nav ul {
    display: flex;
    gap: 2.5rem; /* Increased gap for better readability */
}

.desktop-nav a {
    font-weight: 500;
    color: var(--cloud-white);
    transition: all 0.3s ease;
    position: relative;
    padding: 0.5rem 0;
}

.desktop-nav a:hover, .desktop-nav a.active {
    color: var(--sunset-gold);
}

.desktop-nav a.active::after {
    content: '';
    position: absolute;
    bottom: -8px; /* Adjusted position for a cleaner look */
    left: 0;
    width: 100%;
    height: 3px; /* Thicker underline */
    background-color: var(--sunset-gold);
    border-radius: 2px; /* Soften edges */
}

.desktop-nav a:hover::after {
    content: '';
    position: absolute;
    bottom: -8px; /* Adjusted position for a cleaner look */
    left: 0;
    width: 100%;
    height: 3px; /* Thicker underline */
    background-color: var(--sunset-gold);
    animation: slideIn 0.3s ease forwards; /* Added forwards to keep the state */
    border-radius: 2px;
}

@keyframes slideIn {
    from { width: 0; }
    to { width: 100%; }
}

.user-actions.desktop-actions {
    display: flex; /* Always show on desktop */
    align-items: center;
    gap: 1.2rem; /* Increased gap */
}

.sign-in-link {
    color: var(--cloud-white);
    transition: color 0.3s;
    display: flex;
    align-items: center;
    gap: 0.6rem; /* Adjusted gap */
    font-weight: 500;
}

.sign-in-link:hover {
    color: var(--sunset-gold);
}

.user-actions .btn.btn-outline {
    color: var(--cloud-white);
    border: 2px solid var(--cloud-white);
    background: transparent;
    border-radius: 25px;
    padding: 8px 20px;
    font-size: 0.95rem; /* Slightly larger font */
}

.user-actions .btn.btn-outline:hover {
    background: var(--cloud-white);
    color: var(--nairobi-blue);
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(255, 255, 255, 0.2);
}

/* Hamburger Menu */
/* Hamburger Menu */
.hamburger-menu {
    display: none; /* Hidden by default on desktop */
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 25px;
    cursor: pointer;
    z-index: 110;
    padding: 5px;
    background: transparent;
    border: none;
}

.hamburger-menu .bar {
    width: 100%;
    height: 3px;
    background-color: var(--cloud-white); /* White color */
    border-radius: 5px;
    transition: all 0.3s ease;
    transform-origin: center;
}

/* Hamburger to X transformation */
.hamburger-menu.open .bar:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

.hamburger-menu.open .bar:nth-child(2) {
    opacity: 0;
    transform: scale(0);
}

.hamburger-menu.open .bar:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

/* Mobile Menu Overlay */
.mobile-menu-overlay {
    display: none; /* Hidden by default */
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    z-index: 105;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.mobile-menu-overlay.active {
    display: flex;
    opacity: 1;
    visibility: visible;
}

.mobile-menu-content {
    background-color: #2c3e50;
    width: 70%;
    max-width: 300px;
    height: 100%;
    position: fixed;
    right: 0;
    top: 0;
    padding: 2rem;
    box-shadow: -5px 0 15px rgba(0, 0, 0, 0.2);
    transform: translateX(100%);
    transition: transform 0.3s ease-out;
}

.mobile-menu-overlay.active .mobile-menu-content {
    transform: translateX(0);
}

/* Close button inside mobile menu */
.mobile-menu-close {
    position: absolute;
    top: 20px;
    right: 20px;
    color: var(--cloud-white);
    font-size: 1.5rem;
    cursor: pointer;
    transition: color 0.3s;
}

.mobile-menu-close:hover {
    color: var(--sunset-gold);
}

/* Media Queries */
@media (max-width: 767px) {
    .hamburger-menu {
        display: flex; /* Show hamburger menu on mobile */
    }
    
    /* Ensure the hamburger menu is visible when not open */
    .hamburger-menu:not(.open) {
        display: flex;
    }
    
    /* Hide the hamburger menu when mobile menu is open */
    .mobile-menu-overlay.active ~ .hamburger-menu {
        display: none;
    }
}
/* Removed .close-mobile-menu styles as it's no longer a separate element */

.mobile-nav ul {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    width: 100%;
    margin-top: 2rem;
}

.mobile-nav a {
    color: var(--cloud-white);
    font-size: 1.2rem;
    font-weight: 500;
    display: block;
    padding: 0.5rem 0;
    transition: color 0.3s;
}

.mobile-nav a:hover, .mobile-nav a.active {
    color: var(--sunset-gold);
}

.user-actions.mobile-actions {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    width: 100%;
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.user-actions.mobile-actions .sign-in-link,
.user-actions.mobile-actions .btn-outline {
    width: 100%;
    justify-content: center; /* Center text in buttons */
    padding: 10px 0; /* Adjust padding for full width */
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--nairobi-blue) 0%, var(--savannah-green) 100%);
    color: var(--cloud-white);
    padding: 6rem 2rem; /* Increased padding */
    text-align: center;
    min-height: 85vh; /* Taller hero section */
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-content {
    max-width: 900px; /* Wider content area */
    margin: 0 auto;
}

.hero h1 {
    font-size: 3.5rem; /* Larger hero heading */
    margin-bottom: 1.2rem;
    font-weight: 700;
    line-height: 1.2;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2); /* Text shadow for emphasis */
    color: var(--cloud-white); /* White text for hero heading */
}

.hero p {
    font-size: 1.4rem; /* Larger hero paragraph */
    margin-bottom: 3.5rem;
    opacity: 0.95;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.1);
}

.selector-container {
    background-color: var(--cloud-white);
    border-radius: 15px; /* More rounded corners */
    padding: 3rem; /* Increased padding */
    margin-top: 3rem; /* Increased margin */
    color: var(--text-dark);
    box-shadow: 0 15px 45px rgba(0, 0, 0, 0.15); /* Stronger shadow */
}

.selector-container h3 {
    margin-bottom: 2rem; /* Increased margin */
    color: var(--nairobi-blue);
    font-size: 1.8rem; /* Larger heading */
}

.selector-row {
    display: flex;
    gap: 2rem; /* Increased gap */
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 2rem; /* Increased margin */
}

.selector-group {
    flex: 1;
    min-width: 280px; /* Min-width for selectors */
    text-align: left;
}

.selector-group label {
    display: block;
    margin-bottom: 0.7rem; /* Adjusted margin */
    font-weight: 700; /* Bolder label */
    color: var(--text-dark);
    font-size: 1.05rem;
}

.custom-select {
    position: relative;
    width: 100%;
}

.custom-select select {
    width: 100%;
    padding: 14px 20px; /* Increased padding */
    border: 1px solid var(--border-color);
    border-radius: 8px; /* More rounded input */
    background-color: var(--cloud-white);
    font-size: 1.05rem;
    appearance: none;
    cursor: pointer;
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.05); /* Inner shadow for depth */
    transition: border-color 0.3s, box-shadow 0.3s;
}

.custom-select select:focus {
    outline: none;
    border-color: var(--nairobi-blue);
    box-shadow: 0 0 0 4px rgba(0, 102, 204, 0.1);
}

.custom-select::after {
    content: '\f078'; /* Font Awesome chevron-down */
    font-family: 'Font Awesome 5 Free';
    font-weight: 900;
    position: absolute;
    right: 20px; /* Adjusted position */
    top: 50%;
    transform: translateY(-50%);
    pointer-events: none;
    color: var(--nairobi-blue);
}

#find-resources {
    margin-top: 2rem; /* Increased margin */
    padding: 18px 50px; /* Larger button */
    font-size: 1.2rem; /* Larger font */
    background-color: var(--sunset-gold);
    color: var(--text-dark);
    border-radius: 30px; /* Pill-shaped button */
    font-weight: 700; /* Bolder text */
    letter-spacing: 0.5px;
    box-shadow: 0 5px 15px rgba(255, 153, 0, 0.2);
}

#find-resources:hover {
    background-color: #e68900;
    transform: translateY(-3px); /* More pronounced hover effect */
    box-shadow: 0 8px 20px rgba(255, 153, 0, 0.4);
}

/* Revision Papers Slider Section */
.revision-section {
    padding: 6rem 2rem; /* Increased padding */
    background: var(--background-light);
    text-align: center;
}

.revision-section .section-title {
    position: relative;
    margin-bottom: 4rem; /* Increased margin */
    font-size: 2.8rem; /* Larger section title */
    color: var(--nairobi-blue);
}

.revision-section .section-title::after {
    content: '';
    position: absolute;
    bottom: -15px; /* Adjusted position */
    left: 50%;
    transform: translateX(-50%);
    width: 100px; /* Wider underline */
    height: 4px; /* Thicker underline */
    background: linear-gradient(to right, var(--nairobi-blue) 40%, var(--sunset-gold) 60%);
    border-radius: 2px;
}

.revision-slider {
    position: relative;
    max-width: 1200px;
    margin: 0 auto;
    overflow: hidden;
    border-radius: 20px; /* More rounded */
    box-shadow: 0 20px 50px rgba(0, 102, 204, 0.2); /* Deeper shadow */
    background: linear-gradient(135deg, var(--nairobi-blue), #4a90e2);
    min-height: 550px; /* Ensure a minimum height for the slider */
    display: flex;
    align-items: center; /* Vertically center slider content */
}

.slider-container {
    display: flex;
    transition: transform 0.6s ease-in-out; /* Slower, smoother transition */
    width: 100%;
}

.slider-item {
    min-width: 100%;
    position: relative;
    display: flex; /* Use flex for internal content alignment */
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 2rem; /* Add some padding */
}

.slider-image {
    width: 100%;
    height: 450px; /* Fixed height for consistency */
    max-height: 450px;
    object-fit: contain; /* Use 'contain' to ensure full image visibility within the space */
    display: block;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    background-color: rgba(255,255,255,0.1); /* Slight background for images */
    padding: 10px; /* Padding around image if object-fit is contain */
}

.slider-caption {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(0,0,0,0.9)); /* Darker gradient */
    color: white;
    padding: 2.5rem; /* More padding */
    text-align: center;
    border-radius: 0 0 20px 20px; /* Match slider border radius */
}

.slider-caption h3 {
    margin: 0 0 0.7rem 0;
    font-size: 1.8rem; /* Larger caption heading */
    font-weight: 700;
    color: var(--sunset-gold);
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.3);
}

.slider-caption p {
    margin: 0;
    font-size: 1.1rem; /* Larger caption text */
    opacity: 0.95;
}

.slider-nav {
    display: flex;
    justify-content: center;
    margin-top: 2rem; /* Increased margin */
    padding-bottom: 1.5rem; /* Increased padding */
}

.slider-dot {
    width: 15px; /* Larger dots */
    height: 15px; /* Larger dots */
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.4); /* Lighter background for inactive dots */
    margin: 0 7px; /* More space between dots */
    cursor: pointer;
    transition: all 0.3s;
    border: 2px solid var(--cloud-white);
}

.slider-dot.active {
    background: var(--sunset-gold);
    border-color: var(--sunset-gold);
    transform: scale(1.2); /* Active dot pops out slightly */
}

.slider-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: var(--cloud-white);
    border: 3px solid var(--nairobi-blue);
    width: 50px; /* Slightly smaller arrows for sleeker look */
    height: 50px; /* Slightly smaller arrows */
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem; /* Adjusted icon size */
    cursor: pointer;
    color: var(--nairobi-blue);
    transition: all 0.3s;
    z-index: 10;
    box-shadow: 0 6px 20px rgba(0, 102, 204, 0.25); /* Stronger shadow */
}

.slider-arrow:hover {
    background: var(--nairobi-blue);
    color: var(--cloud-white);
    border-color: var(--sunset-gold);
    transform: translateY(-50%) scale(1.05); /* Slight scale on hover */
}

.slider-arrow.prev {
    left: 25px; /* Adjusted position */
}

.slider-arrow.next {
    right: 25px; /* Adjusted position */
}

.revision-cta {
    margin-top: 3rem; /* Increased margin */
}

.revision-cta .btn {
    padding: 1rem 2.5rem; /* Larger CTA button */
    font-size: 1.2rem; /* Larger font */
    font-weight: 700;
    background: var(--sunset-gold);
    color: var(--text-dark);
    border: none;
    border-radius: 35px; /* More rounded */
    box-shadow: 0 4px 15px rgba(255, 153, 0, 0.2);
}

.revision-cta .btn:hover {
    background: var(--nairobi-blue);
    color: var(--cloud-white);
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

/* Books Section (General styles for Popular, Papers, Setbooks) */
.books-section {
    padding: 6rem 2rem; /* Consistent padding */
    background-color: var(--cloud-white);
}

.section-title {
    text-align: center;
    margin-bottom: 4rem; /* Consistent margin */
    color: var(--nairobi-blue);
    font-size: 2.8rem; /* Consistent title size */
    font-weight: 700;
    letter-spacing: 0.5px;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 4px;
    background: linear-gradient(to right, var(--nairobi-blue) 40%, var(--sunset-gold) 60%);
    border-radius: 2px;
}

.books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2.5rem; /* Increased gap for better spacing */
    max-width: 1200px;
    margin: 0 auto;
}

.book-card {
    background-color: var(--cloud-white);
    border-radius: 16px; /* More rounded corners */
    overflow: hidden;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1); /* Deeper shadow */
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid var(--border-color);
    display: flex; /* Use flexbox for card content */
    flex-direction: column;
}

.book-card:hover {
    transform: translateY(-12px); /* More pronounced hover effect */
    box-shadow: 0 20px 45px rgba(0, 0, 0, 0.2);
}

.book-header {
    position: relative;
    height: 220px; /* Taller header for images */
    background: linear-gradient(135deg, var(--nairobi-blue), var(--savannah-green));
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden; /* Ensure images don't overflow border-radius */
    border-radius: 16px 16px 0 0; /* Apply border-radius only to top */
}

.book-image {
    width: 100%;
    height: 100%;
    object-fit: cover; /* Cover the entire area */
    display: block;
    transition: transform 0.3s ease; /* Smooth image zoom */
}

.book-card:hover .book-image {
    transform: scale(1.05); /* Slight zoom on hover */
}

.book-badge {
    position: absolute;
    top: 15px; /* Adjusted position */
    right: 15px; /* Adjusted position */
    background-color: var(--sunset-gold);
    color: var(--text-dark);
    padding: 6px 15px; /* Larger padding */
    border-radius: 20px; /* More rounded */
    font-size: 0.9rem; /* Slightly larger font */
    font-weight: 700; /* Bolder text */
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    z-index: 5; /* Ensure badge is on top */
}

.book-info {
    padding: 1.8rem; /* More padding */
    flex-grow: 1; /* Allow info section to grow */
    display: flex;
    flex-direction: column;
}

.book-info h3 {
    margin-bottom: 0.6rem;
    color: var(--nairobi-blue);
    font-size: 1.5rem; /* Larger heading */
    line-height: 1.3;
}

.book-meta {
    display: flex;
    justify-content: space-between;
    color: var(--mt-kenya-gray);
    font-size: 0.95rem; /* Slightly larger font */
    margin-bottom: 1.2rem;
    align-items: center;
    flex-wrap: wrap; /* Allow meta items to wrap */
    gap: 0.5rem; /* Gap for wrapped items */
}

.book-meta-left, .book-meta-right {
    display: flex;
    align-items: center;
    gap: 0.6rem; /* Adjusted gap */
}

.book-meta-right {
    color: var(--nairobi-blue);
    font-weight: 600;
}

.book-desc {
    margin-bottom: 1.8rem; /* Increased margin */
    font-size: 1rem; /* Slightly larger font */
    line-height: 1.6;
    color: var(--text-dark);
    flex-grow: 1; /* Allow description to grow */
}

.book-actions {
    display: flex;
    justify-content: center;
    margin-top: auto; /* Push actions to the bottom */
}

.btn-download {
    background-color: var(--savannah-green);
    color: white;
    padding: 12px 25px; /* Consistent button padding */
    border-radius: 8px; /* Consistent button radius */
    font-size: 1rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.6rem; /* Adjusted gap */
    transition: all 0.3s ease;
    width: 100%; /* Make button full width of card action area */
    justify-content: center;
}

.btn-download:hover {
    background-color: #26734d;
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(46, 139, 87, 0.4);
}

/* About Section */
.about-section {
    background: var(--background-light);
    padding: 6rem 2rem; /* Consistent padding */
    text-align: center;
}

.about-container {
    max-width: 900px;
    margin: 0 auto;
}

.about-container h2 {
    color: var(--nairobi-blue);
    font-size: 2.8rem; /* Consistent title size */
    margin-bottom: 2rem; /* Increased margin */
    position: relative;
}

.about-container h2::after {
    content: '';
    position: absolute;
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(to right, var(--nairobi-blue) 40%, var(--sunset-gold) 60%);
    border-radius: 2px;
}

.about-container p {
    font-size: 1.15rem; /* Larger paragraph text */
    margin: 2rem 0; /* Increased margin */
    line-height: 1.8;
    color: var(--text-dark);
}

.about-container ul {
    list-style: none;
    padding: 0;
    font-size: 1.1rem; /* Larger list items */
    margin-top: 2.5rem; /* Increased margin */
    text-align: left; /* Align list to left */
    display: inline-block; /* Allow alignment */
}

.about-container li {
    margin-bottom: 1rem; /* Increased margin */
    color: var(--text-dark);
    display: flex;
    align-items: center;
    gap: 1rem;
}

.about-container li::before {
    content: '\f00c'; /* Font Awesome checkmark icon */
    font-family: 'Font Awesome 5 Free';
    font-weight: 900;
    color: var(--savannah-green);
    font-size: 1.2em;
}

/* Contact Section */
.contact-section {
    background: var(--cloud-white);
    padding: 6rem 2rem; /* Consistent padding */
}

.contact-container {
    max-width: 1000px;
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    gap: 4rem; /* Increased gap */
    align-items: flex-start;
}

.contact-form-section {
    flex: 2; /* Allow form to take more space */
    min-width: 320px; /* Increased min-width */
}

.contact-form-section h2 {
    color: var(--nairobi-blue);
    font-size: 2.8rem; /* Consistent title size */
    margin-bottom: 2rem; /* Increased margin */
    position: relative;
}

.contact-form-section h2::after {
    content: '';
    position: absolute;
    bottom: -15px;
    left: 0;
    width: 80px;
    height: 4px;
    background: linear-gradient(to right, var(--nairobi-blue) 40%, var(--sunset-gold) 60%);
    border-radius: 2px;
}

#contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.2rem; /* Increased gap */
}

#contact-form input,
#contact-form textarea {
    padding: 14px 18px; /* Increased padding */
    border: 1px solid var(--border-color);
    border-radius: 8px; /* More rounded */
    font-size: 1.05rem;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
    width: 100%; /* Ensure full width */
}

#contact-form input:focus,
#contact-form textarea:focus {
    outline: none;
    border-color: var(--nairobi-blue);
    box-shadow: 0 0 0 4px rgba(0, 102, 204, 0.1);
}

#contact-form textarea {
    resize: vertical; /* Allow vertical resizing */
    min-height: 120px; /* Minimum height for textarea */
}

#contact-form button {
    padding: 14px 30px; /* Larger button */
    font-size: 1.1rem;
    border-radius: 8px;
    margin-top: 1rem;
}

.contact-info-section {
    flex: 1;
    min-width: 280px; /* Increased min-width */
}

.contact-info-section h3 {
    color: var(--nairobi-blue);
    font-size: 2rem; /* Larger heading */
    margin-bottom: 2rem; /* Increased margin */
    position: relative;
}

.contact-info-section h3::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 60px;
    height: 3px;
    background-color: var(--sunset-gold);
    border-radius: 2px;
}

.contact-info-list {
    list-style: none;
    padding: 0;
}

.contact-info-list li {
    display: flex;
    align-items: flex-start; /* Align icon and text at the top */
    gap: 1.2rem; /* Increased gap */
    margin-bottom: 1.5rem; /* Increased margin */
    font-size: 1.05rem;
    color: var(--text-dark);
}

.contact-info-list i {
    color: var(--nairobi-blue);
    font-size: 1.3em; /* Larger icons */
    width: 25px; /* Ensure consistent icon width */
    text-align: center;
    flex-shrink: 0; /* Prevent icon from shrinking */
}

/* Footer */
footer {
    background-color: var(--footer-bg);
    color: var(--cloud-white);
    padding: 5rem 0 0; /* Adjusted padding */
}

.footer-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); /* Adjusted minmax */
    gap: 3rem; /* Increased gap */
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.footer-logo {
    font-size: 2rem; /* Larger logo */
    font-weight: 700;
    margin-bottom: 1.2rem;
    color: var(--sunset-gold);
}

.footer-section p {
    color: rgba(255, 255, 255, 0.85); /* Slightly less transparent */
    line-height: 1.7;
    margin-bottom: 1.8rem;
}

.social-links {
    display: flex;
    gap: 1.2rem; /* Increased gap */
    margin-top: 2rem; /* Increased margin */
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 45px; /* Larger social icons */
    height: 45px; /* Larger social icons */
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.15); /* Slightly less transparent */
    transition: background-color 0.3s, transform 0.2s;
    color: rgba(255, 255, 255, 0.8);
    font-size: 1.1rem;
}

.social-links a:hover {
    background-color: var(--sunset-gold);
    color: var(--text-dark);
    transform: translateY(-3px); /* Pop effect on hover */
}

.footer-section h3 {
    margin-bottom: 1.8rem; /* Increased margin */
    position: relative;
    padding-bottom: 0.8rem; /* Increased padding */
    color: var(--sunset-gold);
    font-size: 1.6rem; /* Larger heading */
}

.footer-section h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px; /* Wider underline */
    height: 3px;
    background-color: var(--sunset-gold);
    border-radius: 2px;
}

.footer-links li {
    margin-bottom: 1rem;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.85);
    transition: color 0.3s, transform 0.2s;
    position: relative;
    padding-left: 20px; /* More space for the bullet */
    font-size: 1rem;
}

.footer-links a::before {
    content: '\f0da'; /* Font Awesome angle-right icon as bullet */
    font-family: 'Font Awesome 5 Free';
    font-weight: 900;
    position: absolute;
    left: 0;
    color: var(--sunset-gold);
    font-size: 0.9em;
}

.footer-links a:hover {
    color: var(--sunset-gold);
    transform: translateX(5px); /* Slide effect on hover */
}

.newsletter-section {
    grid-column: span 1;
}

.newsletter-form {
    display: flex;
    flex-direction: column;
    gap: 1.2rem; /* Increased gap */
}

.newsletter-input {
    padding: 14px 18px; /* Increased padding */
    border: 1px solid rgba(255, 255, 255, 0.3); /* Slightly more visible border */
    border-radius: 8px; /* More rounded */
    background-color: rgba(255, 255, 255, 0.15); /* Slightly less transparent */
    color: var(--cloud-white);
    font-size: 1rem;
}

.newsletter-input::placeholder {
    color: rgba(255, 255, 255, 0.7); /* More visible placeholder */
}

.newsletter-input:focus {
    outline: none;
    border-color: var(--sunset-gold);
    box-shadow: 0 0 0 3px rgba(255, 153, 0, 0.2);
}

.newsletter-btn {
    padding: 14px 30px; /* Larger button */
    font-size: 1.1rem;
    border-radius: 8px;
    background-color: var(--sunset-gold);
    color: var(--text-dark);
}

.newsletter-btn:hover {
    background-color: #e68900;
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(255, 153, 0, 0.2);
}

.copyright {
    text-align: center;
    padding: 2rem 0; /* Increased padding */
    margin-top: 4rem; /* Increased margin */
    border-top: 1px solid rgba(255, 255, 255, 0.15); /* Slightly more visible border */
    font-size: 0.95rem;
    color: rgba(255, 255, 255, 0.75);
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    z-index: 10000;
    left: 0; top: 0; width: 100vw; height: 100vh;
    background: rgba(0,0,0,0.5); /* Darker overlay for better focus */
    align-items: center;
    justify-content: center;
    padding: 15px; /* Add padding for small screens */
    animation: fadeIn 0.3s ease-out forwards;
}

.modal[style*="display: flex"] {
    display: flex !important; /* Ensure visibility */
}

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

.modal-content {
    background: #fff;
    border-radius: 20px;
    padding: 3rem 3.5rem; /* Increased padding */
    box-shadow: 0 15px 50px rgba(0,0,0,0.2); /* Stronger shadow */
    min-width: 380px; /* Increased min-width */
    max-width: 90vw; /* Keep it within viewport */
    position: relative;
    text-align: center;
    animation: slideInUp 0.4s cubic-bezier(0.68, -0.55, 0.27, 1.55) forwards; /* Spring-like animation */
}

@keyframes slideInUp {
    from { transform: translateY(50px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.close-modal {
    position: absolute;
    top: 20px; /* Adjusted position */
    right: 25px; /* Adjusted position */
    font-size: 1.8rem; /* Larger close icon */
    color: #888;
    cursor: pointer;
    font-weight: bold;
    transition: color 0.2s, transform 0.2s;
}

.close-modal:hover {
    color: var(--nairobi-blue); /* Use primary color on hover */
    transform: rotate(90deg); /* Spin effect on close */
}

.modal-content h2 {
    font-size: 2.2rem; /* Larger modal heading */
    margin-bottom: 1.8rem; /* Increased margin */
    color: var(--nairobi-blue);
}

.modal-content form {
    display: flex;
    flex-direction: column;
    gap: 1.2rem; /* Increased gap */
    margin-bottom: 1.5rem; /* Increased margin */
}

.modal-content input,
.modal-content textarea { /* Apply to textarea in modals too */
    padding: 12px 15px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    font-size: 1.05rem;
    transition: border-color 0.3s, box-shadow 0.3s;
}

.modal-content input:focus,
.modal-content textarea:focus {
    outline: none;
    border-color: var(--nairobi-blue);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

.modal-content button {
    margin-top: 1rem;
    width: 100%; /* Full width button */
}

.modal-content p {
    font-size: 0.95rem;
    color: var(--text-dark);
}

.modal-content p a {
    color: var(--nairobi-blue);
    font-weight: 600;
    transition: color 0.2s;
}

.modal-content p a:hover {
    color: var(--sunset-gold);
    text-decoration: underline;
}

#download-modal-message {
    margin-top: 1rem;
    font-weight: 600;
    color: var(--savannah-green);
}

#download-pesapal-btn {
    margin-top: 1.5rem;
    background-color: #34b7a7; /* PesaPal brand color */
    color: white;
}

#download-pesapal-btn:hover {
    background-color: #2da193;
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(52, 183, 167, 0.3);
}

/* Responsive Styles */
@media (max-width: 992px) { /* Tablet size */
    .header-container {
        padding: 1rem 1.5rem;
    }
    .desktop-nav {
        display: block; /* Keep desktop nav for larger tablets */
    }
    .desktop-nav ul {
        gap: 1.5rem;
    }
    .user-actions.desktop-actions {
        display: flex; /* Keep desktop actions for larger tablets */
    }
    .hamburger-menu {
        display: none; /* Still hidden on larger tablets */
    }

    .hero h1 {
        font-size: 2.8rem;
    }
    .hero p {
        font-size: 1.2rem;
    }
    .selector-container {
        padding: 2.5rem;
    }
    .selector-row {
        gap: 1rem;
        flex-direction: column; /* Stack selectors */
    }
    .revision-section, .books-section, .about-section, .contact-section {
        padding: 5rem 1.5rem;
    }
    .section-title {
        font-size: 2.5rem;
    }
    .revision-slider {
        min-height: 450px; /* Adjust slider height */
    }
    .slider-image {
        height: 400px;
    }
    .slider-arrow {
        width: 45px;
        height: 45px;
        font-size: 1.2rem;
    }
    .slider-arrow.prev {
        left: 15px;
    }
    .slider-arrow.next {
        right: 15px;
    }
    .books-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
        gap: 2rem;
    }
    .contact-container {
        gap: 3rem;
        flex-direction: column; /* Stack contact sections */
    }
    .contact-form-section, .contact-info-section {
        min-width: unset; /* Remove min-width for stacking */
        width: 100%;
    }
    .footer-container {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        padding: 0 1.5rem;
    }
}

@media (max-width: 767px) { /* Mobile devices */
    .header-container {
        flex-direction: row; /* Keep logo and hamburger on one row */
        justify-content: space-between;
        padding: 1rem 1.5rem;
    }
    .desktop-nav, .user-actions.desktop-actions {
        display: none; /* Hide desktop nav and actions */
    }
    .hamburger-menu {
        display: flex; /* Show hamburger menu */
    }

    .hero {
        padding: 4rem 1.5rem;
        min-height: 70vh;
    }
    .hero h1 {
        font-size: 2.2rem;
    }
    .hero p {
        font-size: 1rem;
        margin-bottom: 2rem;
    }
    .selector-container {
        padding: 2rem;
    }
    .selector-container h3 {
        font-size: 1.6rem;
    }
    #find-resources {
        padding: 15px 35px;
        font-size: 1rem;
    }
    .revision-section, .books-section, .about-section, .contact-section {
        padding: 4rem 1rem;
    }
    .section-title {
        font-size: 2.2rem;
        margin-bottom: 3rem;
    }
    .revision-slider {
        min-height: 380px;
        border-radius: 15px;
        box-shadow: 0 10px 30px rgba(0, 102, 204, 0.1);
    }
    .slider-image {
        height: 300px;
    }
    .slider-caption {
        padding: 1.5rem;
        border-radius: 0 0 15px 15px;
    }
    .slider-caption h3 {
        font-size: 1.5rem;
    }
    .slider-caption p {
        font-size: 0.9rem;
    }
    .slider-arrow {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }
    .slider-arrow.prev {
        left: 10px;
    }
    .slider-arrow.next {
        right: 10px;
    }
    .revision-cta .btn {
        padding: 0.8rem 2rem;
        font-size: 1.1rem;
    }
    .books-grid {
        grid-template-columns: 1fr; /* Single column layout */
        gap: 1.5rem;
    }
    .book-card {
        border-radius: 12px;
        box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
    }
    .book-header {
        height: 180px;
        border-radius: 12px 12px 0 0;
    }
    .book-info {
        padding: 1.2rem;
    }
    .book-info h3 {
        font-size: 1.3rem;
    }
    .book-desc {
        font-size: 0.95rem;
        margin-bottom: 1.2rem;
    }
    .btn-download {
        padding: 10px 20px;
        font-size: 0.9rem;
    }
    .about-container h2 {
        font-size: 2.2rem;
    }
    .about-container p {
        font-size: 1rem;
        margin: 1.5rem 0;
    }
    .about-container ul {
        font-size: 1rem;
        margin-top: 2rem;
    }
    .contact-form-section h2, .contact-info-section h3 {
        font-size: 2.2rem;
    }
    .contact-info-list li {
        font-size: 1rem;
        margin-bottom: 1rem;
    }
    .footer-container {
        grid-template-columns: 1fr; /* Single column for footer */
        padding: 0 1rem;
    }
    .footer-section {
        text-align: center;
    }
    .footer-section h3::after {
        left: 50%;
        transform: translateX(-50%);
    }
    .footer-links a::before {
        content: '\f105'; /* Use a simpler chevron icon */
        left: unset;
        right: 100%; /* Position before text on right */
        transform: translateX(-15px); /* Adjust for spacing */
    }
    .social-links {
        justify-content: center;
    }
    .modal-content {
        min-width: unset;
        width: 95%;
        padding: 2rem;
        border-radius: 15px;
    }
    .modal-content h2 {
        font-size: 1.8rem;
    }
    .close-modal {
        font-size: 1.5rem;
        top: 15px;
        right: 18px;
    }
}

@media (max-width: 480px) { /* Smallest mobile devices */
    .header-container {
        padding: 0.8rem;
    }
    .logo {
        font-size: 1.4rem;
    }
    .logo-img {
        height: 32px;
        margin-right: 5px;
    }
    .hamburger-menu {
        width: 25px;
        height: 20px;
    }
    .hamburger-menu .bar {
        height: 2px;
    }
    .mobile-menu-content {
        width: 80%; /* Wider mobile menu for very small screens */
        padding: 1.5rem;
    }
    /* Removed .close-mobile-menu specific styles for 480px as it's no longer a separate element */
    .mobile-nav a {
        font-size: 1.1rem;
    }
    .user-actions.mobile-actions .sign-in-link,
    .user-actions.mobile-actions .btn-outline {
        font-size: 0.9rem;
        padding: 8px 0;
    }

    .hero {
        padding: 3rem 1rem;
        min-height: 60vh;
    }
    .hero h1 {
        font-size: 1.8rem;
    }
    .hero p {
        font-size: 0.9rem;
        margin-bottom: 1.5rem;
    }
    .selector-container {
        padding: 1.5rem;
    }
    .selector-container h3 {
        font-size: 1.4rem;
        margin-bottom: 1rem;
    }
    .selector-group label {
        font-size: 0.95rem;
        margin-bottom: 0.3rem;
    }
    .custom-select select {
        padding: 10px 12px;
        font-size: 0.95rem;
    }
    .custom-select::after {
        right: 12px;
    }
    #find-resources {
        padding: 12px 25px;
        font-size: 0.95rem;
    }
    .revision-section, .books-section, .about-section, .contact-section {
        padding: 3rem 1rem;
    }
    .section-title {
        font-size: 1.8rem;
        margin-bottom: 2.5rem;
    }
    .section-title::after {
        width: 60px;
        height: 3px;
    }
    .revision-slider {
        min-height: 300px;
        border-radius: 10px;
    }
    .slider-image {
        height: 220px;
    }
    .slider-caption {
        padding: 1rem;
        border-radius: 0 0 10px 10px;
    }
    .slider-caption h3 {
        font-size: 1.2rem;
    }
    .slider-caption p {
        font-size: 0.9rem;
    }
    .slider-arrow {
        width: 35px;
        height: 35px;
        font-size: 0.9rem;
    }
    .slider-arrow.prev {
        left: 5px;
    }
    .slider-arrow.next {
        right: 5px;
    }
    .revision-cta .btn {
        padding: 0.7rem 1.5rem;
        font-size: 1rem;
    }
    .books-grid {
        gap: 1rem;
    }
    .book-card {
        border-radius: 10px;
    }
    .book-header {
        height: 150px;
        border-radius: 10px 10px 0 0;
    }
    .book-badge {
        padding: 4px 10px;
        font-size: 0.75rem;
    }
    .book-info {
        padding: 1rem;
    }
    .book-info h3 {
        font-size: 1.1rem;
    }
    .book-meta {
        font-size: 0.85rem;
        margin-bottom: 0.8rem;
    }
    .book-desc {
        font-size: 0.85rem;
        margin-bottom: 1rem;
    }
    .btn-download {
        padding: 8px 15px;
        font-size: 0.85rem;
    }
    .about-container h2 {
        font-size: 1.8rem;
    }
    .about-container p {
        font-size: 0.95rem;
        margin: 1rem 0;
    }
    .about-container ul {
        font-size: 0.95rem;
        margin-top: 1.5rem;
    }
    .contact-form-section h2, .contact-info-section h3 {
        font-size: 1.8rem;
    }
    #contact-form input,
    #contact-form textarea {
        padding: 10px 12px;
        font-size: 0.95rem;
    }
    #contact-form button {
        padding: 10px 20px;
        font-size: 0.95rem;
    }
    .contact-info-list li {
        font-size: 0.95rem;
    }
    .footer-section h3 {
        font-size: 1.4rem;
        margin-bottom: 1rem;
        padding-bottom: 0.5rem;
    }
    .footer-section p {
        font-size: 0.9rem;
    }
    .social-links a {
        width: 38px;
        height: 38px;
        font-size: 0.95rem;
    }
    .footer-links a {
        font-size: 0.9rem;
    }
    .newsletter-input {
        padding: 10px 12px;
        font-size: 0.95rem;
    }
    .newsletter-btn {
        padding: 10px 20px;
        font-size: 0.95rem;
    }
    .copyright {
        padding: 1rem 0;
        margin-top: 2rem;
        font-size: 0.85rem;
    }
    .modal-content {
        padding: 1.5rem;
        border-radius: 12px;
    }
    .modal-content h2 {
        font-size: 1.5rem;
    }
}