/* COSI 230B Course Website Styles */

:root {
    --primary-color: #003478;
    --primary-light: #0070ae;
    --accent-color: #4CAF50;
    --text-color: #333;
    --text-light: #666;
    --bg-color: #f8f9fa;
    --card-bg: #ffffff;
    --border-color: #e0e0e0;
}

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

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

/* Header */
header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    color: white;
    padding: 40px 20px;
}

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

header .course-code {
    font-size: 1rem;
    opacity: 0.9;
    margin-bottom: 5px;
    letter-spacing: 1px;
}

header h1 {
    font-size: 2.2rem;
    margin-bottom: 10px;
    font-weight: 700;
}

header .subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
}

header .meta {
    margin-top: 20px;
    font-size: 0.95rem;
    opacity: 0.85;
}

header .meta span {
    margin-right: 25px;
}

/* Navigation */
nav {
    background: white;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

nav ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 5px;
    padding: 10px 20px;
}

nav a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    padding: 10px 18px;
    border-radius: 6px;
    transition: all 0.2s;
    font-size: 0.95rem;
}

nav a:hover {
    background: var(--bg-color);
    color: var(--primary-light);
}

nav a.active {
    background: var(--primary-color);
    color: white;
}

/* Main Content */
main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 20px;
}

/* Page Title */
.page-title {
    margin-bottom: 30px;
}

.page-title h2 {
    font-size: 1.8rem;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.page-title p {
    color: var(--text-light);
}

/* Cards */
.card {
    background: var(--card-bg);
    border-radius: 10px;
    padding: 25px;
    margin-bottom: 25px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.card h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
    font-size: 1.3rem;
}

.card h4 {
    color: var(--text-color);
    margin: 20px 0 10px 0;
    font-size: 1.1rem;
}

.card p {
    margin-bottom: 12px;
    color: var(--text-color);
}

.card ul, .card ol {
    margin-left: 25px;
    margin-bottom: 15px;
}

.card li {
    margin-bottom: 8px;
}

/* Announcement Cards */
.announcement {
    border-left: 4px solid var(--accent-color);
}

.announcement.urgent {
    border-left-color: #f44336;
    background: #fff8f8;
}

.announcement .date {
    font-size: 0.85rem;
    color: var(--text-light);
    margin-bottom: 10px;
}

/* Info Box */
.info-box {
    background: #e3f2fd;
    border-left: 4px solid var(--primary-light);
    padding: 15px 20px;
    margin: 15px 0;
    border-radius: 0 8px 8px 0;
}

.info-box.warning {
    background: #fff3e0;
    border-left-color: #ff9800;
}

.info-box.success {
    background: #e8f5e9;
    border-left-color: var(--accent-color);
}

/* Grid Layout */
.grid {
    display: grid;
    gap: 25px;
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

/* Schedule Table */
.schedule-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
}

.schedule-table th,
.schedule-table td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.schedule-table th {
    background: var(--primary-color);
    color: white;
    font-weight: 600;
}

.schedule-table tr:hover {
    background: #f5f5f5;
}

.schedule-table tr.break {
    background: #fff3e0;
    font-style: italic;
}

.schedule-table tr.presentation {
    background: #e3f2fd;
    font-weight: 500;
}

.schedule-table tr.current {
    background: #e8f5e9;
    font-weight: 500;
}

.week-num {
    font-weight: 600;
    color: var(--primary-color);
}

/* Lecture/Activity Cards */
.resource-card {
    background: var(--card-bg);
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    transition: all 0.3s;
    text-decoration: none;
    color: inherit;
    display: block;
    border-left: 4px solid var(--primary-light);
}

.resource-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.1);
}

.resource-card.locked {
    opacity: 0.45;
    filter: grayscale(1);
    pointer-events: none;
    position: relative;
}

.resource-card.locked:hover {
    transform: none;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.resource-card.locked::after {
    content: "Locked";
    position: absolute;
    top: 12px;
    right: 12px;
    background: #9e9e9e;
    color: white;
    font-size: 0.7rem;
    font-weight: 600;
    padding: 4px 10px;
    border-radius: 999px;
    letter-spacing: 0.03em;
}

.resource-card h4 {
    color: var(--primary-color);
    margin-bottom: 8px;
    font-size: 1.05rem;
}

.resource-card p {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 10px;
}

.resource-card .meta {
    font-size: 0.8rem;
    color: var(--text-light);
}

/* Tags */
.tag {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 15px;
    font-size: 0.75rem;
    font-weight: 500;
    margin-right: 5px;
}

.tag.pdf {
    background: #ffebee;
    color: #c62828;
}

.tag.slides {
    background: #e3f2fd;
    color: #1565c0;
}

.tag.activity {
    background: #e8f5e9;
    color: #2e7d32;
}

.tag.llm {
    background: #f3e5f5;
    color: #7b1fa2;
}

.tag.due {
    background: #fff3e0;
    color: #e65100;
}

/* Contact Info */
.contact-card {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.contact-card .avatar {
    width: 80px;
    height: 80px;
    background: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 2rem;
    font-weight: 600;
    flex-shrink: 0;
}

.contact-card .info h4 {
    margin-bottom: 5px;
}

.contact-card .info p {
    margin-bottom: 5px;
    font-size: 0.95rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 10px 20px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.2s;
    font-size: 0.95rem;
}

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

.btn-primary:hover {
    background: var(--primary-light);
}

.btn-secondary {
    background: var(--accent-color);
    color: white;
}

.btn-secondary:hover {
    background: #45a049;
}

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

.btn-outline:hover {
    background: var(--primary-color);
    color: white;
}

/* Assignment Box */
.assignment-box {
    background: var(--card-bg);
    border-radius: 10px;
    padding: 20px;
    margin-bottom: 20px;
    border-left: 4px solid var(--primary-light);
}

.assignment-box.upcoming {
    border-left-color: #ff9800;
}

.assignment-box.past {
    opacity: 0.7;
}

.assignment-box h4 {
    color: var(--primary-color);
    margin-bottom: 10px;
}

.assignment-box .dates {
    display: flex;
    gap: 20px;
    font-size: 0.9rem;
    margin-bottom: 10px;
}

.assignment-box .dates span {
    background: var(--bg-color);
    padding: 4px 10px;
    border-radius: 4px;
}

/* Project Timeline */
.timeline {
    position: relative;
    padding-left: 30px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 10px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--border-color);
}

.timeline-item {
    position: relative;
    margin-bottom: 25px;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -24px;
    top: 5px;
    width: 12px;
    height: 12px;
    background: var(--primary-color);
    border-radius: 50%;
}

.timeline-item.completed::before {
    background: var(--accent-color);
}

.timeline-item h4 {
    margin-bottom: 5px;
}

.timeline-item .date {
    font-size: 0.85rem;
    color: var(--text-light);
}

/* Footer */
footer {
    background: var(--primary-color);
    color: white;
    text-align: center;
    padding: 30px 20px;
    margin-top: 60px;
}

footer p {
    opacity: 0.9;
    font-size: 0.9rem;
    margin-bottom: 5px;
}

footer a {
    color: #90caf9;
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

/* Reading List */
.reading-item {
    padding: 15px 0;
    border-bottom: 1px solid var(--border-color);
}

a.reading-item {
    display: block;
    text-decoration: none;
    color: inherit;
    border-radius: 8px;
    padding: 15px;
    margin: 0 -15px;
    transition: background-color 0.2s;
}

a.reading-item:hover {
    background-color: var(--bg-light);
}

a.reading-item:hover .title {
    text-decoration: underline;
}

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

.reading-item .title {
    font-weight: 500;
    color: var(--primary-color);
}

.reading-item .authors {
    font-size: 0.9rem;
    color: var(--text-light);
}

.reading-item .venue {
    font-size: 0.85rem;
    color: var(--text-light);
    font-style: italic;
}

/* Responsive */
@media (max-width: 768px) {
    header h1 {
        font-size: 1.6rem;
    }

    nav ul {
        gap: 3px;
    }

    nav a {
        padding: 8px 12px;
        font-size: 0.85rem;
    }

    .contact-card {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .schedule-table {
        font-size: 0.85rem;
    }

    .schedule-table th,
    .schedule-table td {
        padding: 8px 10px;
    }
}

/* Print styles */
@media print {
    nav, footer {
        display: none;
    }

    header {
        background: none;
        color: black;
        padding: 20px 0;
    }

    .card {
        box-shadow: none;
        border: 1px solid #ddd;
    }
}