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

:root {
    --primary-color: #011F5B;
    --secondary-color: #990000;
    --accent-color: #4a90e2;
    --text-color: #333;
    --light-bg: #f8f9fa;
    --border-color: #dee2e6;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 4px 12px rgba(0, 0, 0, 0.15);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: #fff;
}

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

/* Header */
header {
    background: linear-gradient(135deg, var(--primary-color) 0%, #003366 100%);
    color: white;
    padding: 3rem 0 2rem 0;
    text-align: center;
    box-shadow: var(--shadow);
}

header h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    letter-spacing: -1px;
}

header .subtitle {
    font-size: 1.5rem;
    font-weight: 300;
    margin-bottom: 0.25rem;
}

header .term {
    font-size: 1.2rem;
    opacity: 0.9;
}

/* Navigation */
nav {
    background-color: var(--light-bg);
    border-bottom: 2px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    padding: 0;
}

nav li {
    margin: 0;
}

nav a {
    display: block;
    padding: 1rem 1.5rem;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    border-bottom: 3px solid transparent;
}

nav a:hover {
    background-color: white;
    border-bottom-color: var(--secondary-color);
    color: var(--secondary-color);
}

/* Main Content */
main {
    padding: 2rem 20px 4rem 20px;
}

section {
    margin-bottom: 4rem;
    scroll-margin-top: 80px;
}

h2 {
    color: var(--primary-color);
    font-size: 2rem;
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 3px solid var(--secondary-color);
}

h3 {
    color: var(--primary-color);
    font-size: 1.3rem;
    margin-bottom: 0.75rem;
    margin-top: 1rem;
}

h4 {
    color: var(--primary-color);
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    margin-top: 1rem;
}

p {
    margin-bottom: 1rem;
    text-align: justify;
}

a {
    color: var(--accent-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: var(--secondary-color);
    text-decoration: underline;
}

/* Course Info Box */
.course-info {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-radius: 10px;
    padding: 2rem;
    margin-bottom: 3rem;
    box-shadow: var(--shadow);
    border-left: 5px solid var(--secondary-color);
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.info-item {
    font-size: 1rem;
}

.info-item strong {
    color: var(--primary-color);
    display: block;
    margin-bottom: 0.25rem;
}

/* Schedule Section */
.schedule {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.lecture-item {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    display: grid;
    grid-template-columns: 100px 1fr;
    gap: 1.5rem;
}

.lecture-item:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
}

.lecture-date {
    font-weight: 700;
    color: white;
    background: var(--primary-color);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    text-align: center;
    height: fit-content;
    font-size: 0.95rem;
}

.lecture-content h3 {
    margin-top: 0;
    color: var(--primary-color);
    font-size: 1.2rem;
}

.lecture-content p {
    margin-bottom: 0.75rem;
    color: #666;
    text-align: left;
}

.resources {
    list-style: none;
    padding: 0;
    margin-top: 0.75rem;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.resources li {
    background: var(--light-bg);
    padding: 0.4rem 0.8rem;
    border-radius: 4px;
    font-size: 0.9rem;
    border: 1px solid var(--border-color);
}

.resources a {
    color: var(--primary-color);
    font-weight: 500;
}

.resources a:hover {
    color: var(--secondary-color);
}

/* Objectives List */
.objectives-list {
    list-style: none;
    padding: 0;
}

.objectives-list li {
    padding: 1rem;
    margin-bottom: 0.75rem;
    background: var(--light-bg);
    border-left: 4px solid var(--accent-color);
    border-radius: 4px;
    transition: all 0.3s ease;
}

.objectives-list li:hover {
    background: #e9ecef;
    border-left-color: var(--secondary-color);
    transform: translateX(5px);
}

/* Staff Section */
.staff-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 1.5rem;
}

.staff-member {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
}

.staff-member h3 {
    margin-top: 0;
    color: var(--primary-color);
}

.staff-member p {
    margin-bottom: 0.5rem;
    text-align: left;
}

.note {
    background: #fff3cd;
    border: 1px solid #ffc107;
    padding: 1rem;
    border-radius: 6px;
    margin-top: 1rem;
    text-align: left;
}

/* Grading Section */
.grading-breakdown {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.grade-item {
    display: grid;
    grid-template-columns: 120px 1fr;
    gap: 1.5rem;
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

.grade-item:hover {
    box-shadow: var(--shadow-hover);
}

.grade-percent {
    font-size: 2.5rem;
    font-weight: 700;
    color: white;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    height: 100px;
}

.grade-desc h3 {
    margin-top: 0;
}

.grade-desc p {
    color: #666;
    text-align: left;
}

/* Footer */
footer {
    background: var(--primary-color);
    color: white;
    text-align: center;
    padding: 2rem 0;
    margin-top: 4rem;
}

footer p {
    margin-bottom: 0.5rem;
    text-align: center;
}

/* Responsive Design */
@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }

    header .subtitle {
        font-size: 1.2rem;
    }

    nav ul {
        flex-direction: column;
    }

    nav a {
        border-bottom: 1px solid var(--border-color);
        border-left: 3px solid transparent;
    }

    nav a:hover {
        border-left-color: var(--secondary-color);
        border-bottom-color: var(--border-color);
    }

    .lecture-item {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .lecture-date {
        width: 100%;
    }

    .grade-item {
        grid-template-columns: 1fr;
    }

    .grade-percent {
        height: 80px;
    }

    .info-grid {
        grid-template-columns: 1fr;
    }

    .staff-grid {
        grid-template-columns: 1fr;
    }
}

/* Print Styles */
@media print {
    nav {
        display: none;
    }

    section {
        page-break-inside: avoid;
    }

    .lecture-item {
        box-shadow: none;
        border: 1px solid #ccc;
    }
}