/* --- Global Styles --- */
:root {
    --primary-blue: #054a8e;
    --secondary-blue: #007bff;
    --accent-cyan: #00d4ff;
    --light-gray: #f4f7f6;
    --text-dark: #333;
    --white: #ffffff;
    --shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: var(--light-gray);
    /* Clean background for the content area */
    color: var(--text-dark);
    line-height: 1.6;
}

/* --- Navigation Bar --- */
.navbar {
    background-color: var(--primary-blue);
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
    justify-content: flex-end;
}

.nav-item {
    position: relative;
}

.nav-link {
    color: var(--white);
    text-decoration: none;
    font-weight: 500;
    font-size: 16px;
    padding: 8px 12px;
    transition: color 0.3s ease, border-bottom 0.3s ease;
    border-bottom: 2px solid transparent;
}

.nav-link:hover {
    color: var(--accent-cyan);
    border-bottom: 2px solid var(--accent-cyan);
}

/* --- Search Section --- */
.search-section {
    background-color: var(--light-gray);
    padding: 40px 20px;
    text-align: center;
}

.search-container {
    max-width: 600px;
    margin: 0 auto;
    display: flex;
    gap: 10px;
    position: relative;
}

.search-input {
    flex: 1;
    padding: 14px 16px 14px 45px;
    border: 2px solid var(--secondary-blue);
    border-radius: 25px;
    font-size: 16px;
    outline: none;
    transition: all 0.3s ease;
    background-color: var(--white);
}

.search-input::placeholder {
    color: #999;
}

.search-input:focus {
    border-color: var(--accent-cyan);
    box-shadow: 0 0 15px rgba(0, 212, 255, 0.3);
    background-color: var(--white);
}

.search-container::before {
    content: "🔍";
    position: absolute;
    left: 18px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 18px;
    pointer-events: none;
}

.search-btn {
    background: linear-gradient(135deg, var(--secondary-blue), var(--accent-cyan));
    color: var(--white);
    border: none;
    padding: 14px 30px;
    border-radius: 25px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 10px rgba(0, 123, 255, 0.3);
}

.search-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0, 212, 255, 0.4);
}

.search-btn:active {
    transform: translateY(-1px);
}

.hero {
    position: relative;
    padding: 80px 20px;
    text-align: center;
    color: var(--white);
    border-bottom: 5px solid var(--accent-cyan);
    overflow: hidden;
}

/* Blurred background */
.hero::before {
    content: "";
    position: absolute;
    inset: 0;

    background-image: 
        linear-gradient(
          rgba(5, 74, 142, 0.45),
            rgba(244, 247, 246, 0.35)
        ),
        url('sat.webp');

    background-size: cover;
    background-position: center bottom;
    background-repeat: no-repeat;

    filter: blur(0px);
    transform: scale(1.05); /* prevents edge cutting */
    z-index: -1;
}


/* Dark Tint Overlay for the Hero Image */
.hero .overlay {
    background: rgba(0, 31, 63, 0.8);
    /* Dark blue transparency */
    padding: 40px;
    display: inline-block;
    border-radius: 15px;
    backdrop-filter: blur(3px);
    /* Slight blur for the image behind text */
}

.hero h1 {
    font-size: 2.2rem;
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 1px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.hero h1 span {
    color: var(--accent-cyan);
}

.dept-sub {
    font-weight: 300;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 2px;

}

.tagline {
    margin-top: 15px;
    font-style: italic;
    font-size: 0.85rem;
    opacity: 0.9;
}

/* --- Layout Structure --- */
.layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 30px;
    max-width: 1200px;
    margin: 40px auto;
    padding: 0 20px;
}

/* --- Sidebar --- */
.sidebar {
    background: var(--white);
    padding: 25px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    height: fit-content;
}

.sidebar h3 {
    color: var(--primary-blue);
    font-size: 1.2rem;
    margin-bottom: 15px;
    border-left: 4px solid var(--secondary-blue);
    padding-left: 10px;
}

.sidebar p {
    font-size: 0.9rem;
    margin-bottom: 25px;
    color: #666;
}

.sidebar ul {
    list-style: none;
    margin-bottom: 25px;
}

.sidebar ul li {
    padding: 10px 0;
    border-bottom: 1px solid #eee;
    font-size: 0.95rem;
    cursor: pointer;
    transition: 0.3s;
}

.sidebar ul li:hover {
    color: var(--secondary-blue);
    padding-left: 5px;
}

/* --- Main Content (Resources) --- */
.section-title {
    margin-bottom: 30px;
    color: var(--primary-blue);
    font-size: 1.8rem;
    text-align: center;
}

/* Level Grid */
.level-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 25px;
}
.term-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.level-card {
    background: var(--white);
    border-radius: 12px;
    border: 3px solid var(--primary-blue);
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    text-align: center;
    cursor: pointer;
}

.level-card:hover {
    border-color: var(--accent-cyan);
    box-shadow: 0 8px 20px rgba(0, 212, 255, 0.25);
    transform: translateY(-5px);
}

.level-header {
    background: linear-gradient(135deg, var(--primary-blue), var(--secondary-blue));
    color: var(--white);
    padding: 20px;
    font-weight: bold;
    font-size: 1.3rem;
}

.course-code-input {
    width: 100%;
    border: none;
    background: transparent;
    color: var(--white);
    font-weight: bold;
    font-size: 1.2rem;
    padding: 0;
    outline: none;
}

.course-code-input::placeholder {
    color: rgba(255, 255, 255, 0.7);
}

/* File Upload Styles */
.file-input {
    display: none;
}

.upload-btn {
    cursor: pointer;
    background: var(--secondary-blue);
    color: var(--white);
}

.upload-btn:hover {
    background: var(--accent-cyan);
    color: var(--text-dark);
}

.pdf-list {
    margin-top: 10px;
}

.pdf-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px;
    background: #f0f0f0;
    border-radius: 5px;
    margin: 5px 0;
    font-size: 0.9rem;
}

.pdf-link {
    color: var(--secondary-blue);
    text-decoration: none;
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.pdf-link:hover {
    color: var(--primary-blue);
    text-decoration: underline;
}

.delete-btn {
    background: #ff4444;
    color: white;
    border: none;
    border-radius: 50%;
    width: 24px;
    height: 24px;
    cursor: pointer;
    font-size: 0.8rem;
    margin-left: 5px;
}

.delete-btn:hover {
    background: #cc0000;
}

.term-options {
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.term-btn {
    display: block;
    text-decoration: none;
    background: transparent;
    color: var(--primary-blue);
    padding: 14px 20px;
    border-radius: 6px;
    font-weight: 600;
    transition: all 0.3s ease;
    border: 2px solid var(--primary-blue);
    cursor: pointer;
    font-size: 16px;
}

.term-btn:hover {
    background: transparent;
    color: var(--accent-cyan);
    border-color: var(--accent-cyan);
    transform: translateX(3px);
    box-shadow: 0 4px 12px rgba(0, 212, 255, 0.2);
}.term-btn:hover {
    background: var(--secondary-blue);
    color: var(--white);
}

/* --- Upload Promo --- */
.upload-promo {
    margin-top: 40px;
    background: #e1f5fe;
    padding: 25px;
    border-radius: 10px;
    text-align: center;
    border: 2px dashed var(--secondary-blue);
}

.upload-promo a {
    color: var(--secondary-blue);
    font-weight: bold;
    text-decoration: none;
}

/* --- Footer --- */
footer {
    background: var(--primary-blue);
    color: var(--white);
    text-align: center;
    padding: 25px;
    margin-top: 50px;
}

/* --- Responsive --- */
@media (max-width: 992px) {
    .layout {
        grid-template-columns: 1fr;
    }

    .sidebar {
        order: 2;
    }

    .container {
        order: 1;
    }
}

/* --- Upload Rules Section --- */
.upload-rules {
    background-color: var(--white);
    padding: 30px;
    border-radius: 8px;
    margin-top: 20px;
    box-shadow: var(--shadow);
}

.rule-item {
    margin-bottom: 25px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--light-gray);
}

.rule-item:last-child {
    border-bottom: none;
}

.rule-item h4 {
    color: var(--primary-blue);
    margin-bottom: 12px;
    font-size: 18px;
}

.rule-item ul {
    list-style-position: inside;
    line-height: 1.8;
}

.rule-item li {
    color: var(--text-dark);
    margin-bottom: 8px;
}

.contact-section {
    background-color: rgba(5, 74, 142, 0.1);
    padding: 25px;
    border-radius: 8px;
    margin-top: 30px;
    border-left: 4px solid var(--secondary-blue);
}

.contact-section h3 {
    color: var(--primary-blue);
    margin-bottom: 15px;
}

/* --- Interactive Content Area --- */
.content-area {
    background-color: var(--white);
    border-radius: 8px;
    padding: 30px;
    margin-top: 30px;
    box-shadow: var(--shadow);
}

.content-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--light-gray);
}

.content-header span {
    font-size: 24px;
    font-weight: 600;
    color: var(--primary-blue);
}

.close-btn {
    background: none;
    border: none;
    font-size: 28px;
    cursor: pointer;
    color: var(--text-dark);
    transition: color 0.3s ease;
}

.close-btn:hover {
    color: var(--secondary-blue);
}

/* --- Options Container --- */
.options-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.option-card {
    background: linear-gradient(135deg, rgba(5, 74, 142, 0.1), rgba(0, 212, 255, 0.1));
    padding: 25px;
    border-radius: 8px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.option-card:hover {
    background: linear-gradient(135deg, rgba(5, 74, 142, 0.2), rgba(0, 212, 255, 0.2));
    border-color: var(--accent-cyan);
    transform: translateY(-5px);
}

.option-icon {
    font-size: 48px;
    margin-bottom: 10px;
}

.option-card h3 {
    color: var(--primary-blue);
    margin-bottom: 8px;
    font-size: 20px;
}

.option-card p {
    color: var(--text-dark);
    font-size: 14px;
}

/* --- Items Section --- */
.items-section {
    margin-top: 30px;
}

.items-section h3 {
    color: var(--primary-blue);
    margin-bottom: 20px;
    font-size: 22px;
}

.items-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
}

.item-card {
    background-color: var(--white);
    padding: 25px;
    border-radius: 12px;
    text-align: center;
    transition: all 0.3s ease;
    border: 3px solid var(--primary-blue);
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.item-card:hover {
    border-color: var(--accent-cyan);
    box-shadow: 0 8px 20px rgba(0, 212, 255, 0.25);
    transform: translateY(-5px);
}

.item-card h4 {
    color: var(--primary-blue);
    margin-bottom: 8px;
    font-size: 16px;
}

.item-card p {
    color: var(--text-dark);
    font-size: 14px;
    margin-bottom: 15px;
}

.item-link {
    color: var(--secondary-blue);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.item-link:hover {
    color: var(--accent-cyan);
}

/* Block Grid for selection options */
.block-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 15px;
}

.block-option {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px;
    border: 3px solid var(--primary-blue);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    background-color: var(--white);
    text-align: center;
}

.block-option:hover {
    border-color: var(--accent-cyan);
    box-shadow: 0 8px 20px rgba(0, 212, 255, 0.25);
    transform: translateY(-3px);
}

.block-option input[type="checkbox"],
.block-option input[type="radio"] {
    display: none;
}

.block-option input[type="checkbox"]:checked + .block-icon,
.block-option input[type="radio"]:checked + .block-icon {
    background: linear-gradient(135deg, var(--accent-cyan), var(--secondary-blue));
    color: var(--white);
    box-shadow: 0 4px 12px rgba(0, 212, 255, 0.3);
}

.block-option input[type="checkbox"]:checked ~ .block-label,
.block-option input[type="radio"]:checked ~ .block-label {
    color: var(--accent-cyan);
    font-weight: 600;
}

.block-icon {
    font-size: 40px;
    margin-bottom: 10px;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    transition: all 0.3s ease;
    background-color: rgba(0, 123, 255, 0.05);
}

.block-label {
    color: var(--primary-blue);
    font-weight: 500;
    font-size: 14px;
    transition: all 0.3s ease;
}