:root {
    --primary-color: #8B7355;  /* Light brown */
    --secondary-color: #D2B48C;  /* Lighter brown */
    --background-color: #ffffff;  /* White */
    --text-color: #4A3728;  /* Dark brown for text */
    --card-background: #FAF6F1;  /* Very light beige for cards */
    --border-color: #D2B48C;  /* Light brown for borders */
    --hover-color: #A0876C;  /* Medium brown for hover effects */
}

[data-theme="dark"] {
    --primary-color: #6B4423;  /* Darker brown */
    --secondary-color: #8B7355;  /* Medium brown */
    --background-color: #2D2016;  /* Very dark brown */
    --text-color: #FAF6F1;  /* Light beige for text */
    --card-background: #3D2B1F;  /* Dark brown for cards */
    --border-color: #8B7355;  /* Medium brown for borders */
    --hover-color: #5C3A1E;  /* Dark brown for hover */
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: background-color 0.3s, color 0.3s;
}

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

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background-color: var(--card-background);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-brand {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
}

.nav-links {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 4px;
}

.nav-links a:hover {
    background-color: var(--hover-color);
}

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

.dark-mode-toggle {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.2rem;
    padding: 0.5rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.dark-mode-toggle:hover {
    background-color: var(--hover-color);
}

.hero {
    text-align: center;
    padding: 4rem 2rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.cta-button {
    display: inline-block;
    padding: 1rem 2rem;
    background-color: white;
    color: var(--primary-color);
    text-decoration: none;
    border-radius: 4px;
    font-weight: bold;
    transition: transform 0.2s;
}

.cta-button:hover {
    transform: translateY(-2px);
}

.notes-section {
    padding: 3rem 2rem;
}

.notes-section h2 {
    margin-bottom: 2rem;
    color: var(--text-color);
}

.notes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
}

.note-card {
    background-color: var(--card-background);
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    transition: transform 0.2s, box-shadow 0.2s;
    cursor: pointer;
}

.note-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.note-preview {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.note-card h3 {
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.note-card p {
    color: var(--text-color);
    opacity: 0.8;
    margin-bottom: 1rem;
}

.note-meta {
    display: flex;
    gap: 1rem;
    color: var(--text-color);
    opacity: 0.7;
    font-size: 0.9rem;
}

footer {
    text-align: center;
    padding: 2rem;
    background-color: var(--card-background);
    color: var(--text-color);
    margin-top: 2rem;
}

/* Search Section Styles */
.search-section {
    padding: 2rem;
    background-color: var(--card-background);
    margin-bottom: 2rem;
}

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

#searchInput {
    width: 100%;
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    margin-bottom: 1rem;
    font-size: 1rem;
    background-color: var(--background-color);
    color: var(--text-color);
}

.filters {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.filters select {
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--background-color);
    color: var(--text-color);
    min-width: 150px;
}

/* Pagination Styles */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    margin-top: 2rem;
}

.pagination-btn {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--background-color);
    color: var(--text-color);
    cursor: pointer;
}

.pagination-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Note Detail Page Styles */
.note-detail-section {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

.note-header {
    margin-bottom: 2rem;
}

.note-meta {
    display: flex;
    gap: 2rem;
    margin: 1rem 0;
    color: var(--text-color);
    opacity: 0.8;
}

.note-actions {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.action-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 4px;
    background-color: var(--primary-color);
    color: white;
    cursor: pointer;
    transition: transform 0.2s;
}

.action-btn:hover {
    transform: translateY(-2px);
}

.action-btn.liked {
    background-color: #e74c3c;
}

.pdf-viewer {
    width: 100%;
    margin: 2rem 0;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    overflow: hidden;
}

.note-stats {
    display: flex;
    gap: 2rem;
    margin: 2rem 0;
    padding: 1rem;
    background-color: var(--card-background);
    border-radius: 4px;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.comments-section {
    margin-top: 3rem;
}

.comment-form {
    margin: 2rem 0;
}

.comment-form textarea {
    width: 100%;
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    margin-bottom: 1rem;
    resize: vertical;
    min-height: 100px;
    background-color: var(--background-color);
    color: var(--text-color);
}

.submit-btn {
    padding: 0.5rem 1rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

.comments-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.comment {
    padding: 1rem;
    background-color: var(--card-background);
    border-radius: 4px;
}

.comment-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.5rem;
    color: var(--text-color);
    opacity: 0.8;
}

.comment-text {
    color: var(--text-color);
}

/* Responsive Styles */
@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-links {
        width: 100%;
        justify-content: center;
    }

    .hero h1 {
        font-size: 2rem;
    }

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

    .note-meta {
        flex-direction: column;
        gap: 0.5rem;
    }

    .note-stats {
        flex-direction: column;
        gap: 1rem;
    }

    .filters {
        flex-direction: column;
    }

    .filters select {
        width: 100%;
    }
}

.brand-link {
    text-decoration: none;
    color: inherit;
    cursor: pointer;
}

.note-card-link {
    text-decoration: none;
    color: inherit;
    display: block;
}

.note-card-link:hover {
    text-decoration: none;
}