/* Knowledge Explorer - Modern Responsive Styles */

/* CSS Variables for consistent theming */
:root {
    --primary-color: #0066cc;
    --primary-dark: #004d99;
    --primary-light: #e6f0ff;
    --secondary-color: #4a90d9;
    --text-color: #333;
    --text-light: #666;
    --text-muted: #999;
    --bg-color: #ffffff;
    --bg-light: #f8fafc;
    --bg-dark: #f0f4f8;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --transition: all 0.2s ease;
}

/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background: var(--bg-light);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header Styles */
header {
    background: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 2rem;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

.header-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
}

header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: -0.025em;
}

nav {
    display: flex;
    gap: 0.5rem;
}

nav a {
    text-decoration: none;
    color: var(--text-light);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
}

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

/* Main Content */
main {
    flex: 1;
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
    width: 100%;
}

section {
    margin-bottom: 3rem;
}

h2 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 1.5rem;
    letter-spacing: -0.025em;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 3rem 2rem;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    border-radius: var(--radius-lg);
    color: white;
    margin-bottom: 3rem;
}

.hero h2 {
    color: white;
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.2rem;
    opacity: 0.95;
    max-width: 600px;
    margin: 0 auto;
}

/* Search Section */
.search-section {
    background: var(--bg-color);
    padding: 2rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.search-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.search-input-wrapper {
    display: flex;
    gap: 0.75rem;
}

.search-input-wrapper input[type="text"] {
    flex: 1;
    padding: 1rem 1.25rem;
    font-size: 1.1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: var(--transition);
    background: var(--bg-light);
}

.search-input-wrapper input[type="text"]:focus {
    outline: none;
    border-color: var(--primary-color);
    background: var(--bg-color);
    box-shadow: 0 0 0 3px var(--primary-light);
}

.search-input-wrapper input[type="text"]::placeholder {
    color: var(--text-muted);
}

.search-input-wrapper button {
    padding: 1rem 2rem;
    font-size: 1.1rem;
    font-weight: 600;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

.search-input-wrapper button:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.search-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.filter-chip {
    display: inline-flex;
    align-items: center;
    cursor: pointer;
}

.filter-chip input[type="checkbox"] {
    display: none;
}

.filter-chip span {
    padding: 0.5rem 1rem;
    background: var(--bg-dark);
    border: 2px solid var(--border-color);
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-light);
    transition: var(--transition);
}

.filter-chip:hover span {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.filter-chip input[type="checkbox"]:checked + span {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

/* Categories Section */
.categories-section {
    padding-top: 1rem;
}

.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.category-card {
    background: var(--bg-color);
    padding: 2rem;
    border-radius: var(--radius-lg);
    text-decoration: none;
    color: inherit;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.category-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.category-icon {
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-lg);
    margin-bottom: 1.25rem;
    transition: var(--transition);
}

.documents-icon {
    background: #e3f2fd;
    color: #1976d2;
}

.images-icon {
    background: #fce4ec;
    color: #c2185b;
}

.code-icon {
    background: #e8f5e9;
    color: #388e3c;
}

.notes-icon {
    background: #fff3e0;
    color: #f57c00;
}

.category-card:hover .category-icon {
    transform: scale(1.1);
}

.category-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.category-card p {
    font-size: 0.9rem;
    color: var(--text-light);
    margin-bottom: 1rem;
}

.category-count {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--primary-color);
    background: var(--primary-light);
    padding: 0.35rem 0.75rem;
    border-radius: 50px;
}

/* Results Section */
.results-section {
    padding-top: 1rem;
}

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

.result-card {
    display: flex;
    gap: 1.25rem;
    background: var(--bg-color);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.result-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.result-type {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    font-weight: 700;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    flex-shrink: 0;
}

.result-type.documents {
    background: #e3f2fd;
    color: #1976d2;
}

.result-type.images {
    background: #fce4ec;
    color: #c2185b;
}

.result-type.code {
    background: #e8f5e9;
    color: #388e3c;
}

.result-type.notes {
    background: #fff3e0;
    color: #f57c00;
}

.result-content {
    flex: 1;
    min-width: 0;
}

.result-content h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.result-content p {
    font-size: 0.95rem;
    color: var(--text-light);
    margin-bottom: 0.75rem;
    line-height: 1.5;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}

.result-meta {
    display: flex;
    gap: 1.5rem;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.result-meta span {
    display: flex;
    align-items: center;
    gap: 0.35rem;
}

/* About Section */
.about-section {
    background: var(--bg-color);
    padding: 2.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.about-content > p {
    font-size: 1.1rem;
    color: var(--text-light);
    margin-bottom: 2rem;
    line-height: 1.7;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.feature {
    padding: 1.5rem;
    background: var(--bg-light);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.feature h4 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.feature p {
    font-size: 0.95rem;
    color: var(--text-light);
}

/* Footer */
footer {
    background: var(--bg-color);
    border-top: 1px solid var(--border-color);
    padding: 2rem;
    margin-top: auto;
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    text-align: center;
}

footer p {
    color: var(--text-light);
    font-size: 0.95rem;
}

.footer-credit {
    margin-top: 0.5rem;
}

.footer-credit a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

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

/* Responsive Design */
@media (max-width: 900px) {
    header {
        padding: 1rem 1.5rem;
    }

    main {
        padding: 1.5rem;
    }

    .hero {
        padding: 2.5rem 1.5rem;
    }

    .hero h2 {
        font-size: 2rem;
    }

    .hero p {
        font-size: 1.1rem;
    }

    .category-grid {
        grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    }
}

@media (max-width: 600px) {
    header {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem;
    }

    .header-brand {
        width: 100%;
        justify-content: center;
    }

    nav {
        width: 100%;
        justify-content: center;
        flex-wrap: wrap;
    }

    nav a {
        padding: 0.4rem 0.75rem;
        font-size: 0.9rem;
    }

    main {
        padding: 1rem;
    }

    .hero {
        padding: 2rem 1.25rem;
        border-radius: var(--radius-md);
    }

    .hero h2 {
        font-size: 1.75rem;
    }

    .hero p {
        font-size: 1rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    .search-section {
        padding: 1.5rem;
    }

    .search-input-wrapper {
        flex-direction: column;
    }

    .search-input-wrapper input[type="text"],
    .search-input-wrapper button {
        width: 100%;
    }

    .search-filters {
        justify-content: center;
    }

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

    .category-card {
        padding: 1.5rem;
    }

    .result-card {
        flex-direction: column;
        align-items: flex-start;
        padding: 1.25rem;
    }

    .result-type {
        width: 50px;
        height: 50px;
        font-size: 0.7rem;
    }

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

    .about-section {
        padding: 1.5rem;
    }

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

    footer {
        padding: 1.5rem 1rem;
    }
}

/* Print Styles */
@media print {
    header {
        position: static;
        box-shadow: none;
    }

    .hero {
        background: var(--bg-dark);
        color: var(--text-color);
    }

    .hero h2 {
        color: var(--text-color);
    }

    .search-section,
    .category-card,
    .result-card,
    .about-section {
        box-shadow: none;
        border: 1px solid var(--border-color);
    }
}