/* =========================================
   ENCYCLOPEDIA LIST - Matching Design System
   ========================================= */

.encyclopedia-page {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    position: relative;
}

/* =========================================
   PAGE HEADER
   ========================================= */
.page-header {
    text-align: center;
    margin: 3rem 0 2rem;
    padding: 0 1rem;
}

.page-header h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
}

.page-header h1 .highlight {
    background: linear-gradient(135deg, var(--primary-400), var(--accent-400));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.page-subtitle {
    color: var(--text-muted);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

/* =========================================
   CONTROLS
   ========================================= */
.controls-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 3rem;
    padding: 0 1rem;
}

.view-toggle {
    display: flex;
    justify-content: center;
    gap: 3px;
    background: rgba(28, 25, 23, 0.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 3px;
    border-radius: 10px;
    border: 1px solid var(--border-subtle);
}

.toggle-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.4rem 0.9rem;
    border-radius: 6px;
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.85rem;
    transition: all 0.2s ease;
}

.toggle-btn i {
    width: 14px;
    height: 14px;
}

.toggle-btn:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

.toggle-btn.active {
    background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
    color: white;
}

.search-container {
    position: relative;
    width: 100%;
    max-width: 500px;
}

.search-input {
    width: 100%;
    padding: 1rem 1rem 1rem 3rem;
    background: rgba(28, 25, 23, 0.5);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--border-subtle);
    border-radius: 12px;
    color: var(--text-primary);
    font-size: 1rem;
    font-family: var(--font-main);
    transition: all 0.2s ease;
    box-sizing: border-box;
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.search-input::placeholder {
    color: var(--text-muted);
}

.search-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    pointer-events: none;
    display: flex;
    align-items: center;
    justify-content: center;
}

.search-icon i {
    width: 18px;
    height: 18px;
}

/* =========================================
   CONCEPTS GRID
   ========================================= */
.concept-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
    padding: 0 1rem 4rem;
    max-width: 1400px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.concept-card {
    background: rgba(28, 25, 23, 0.62);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    border: 1px solid var(--border-subtle);
    border-radius: 12px;
    padding: 1.25rem;
    text-decoration: none;
    color: inherit;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

/* Gradient border on hover */
.concept-card::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 12px;
    padding: 1px;
    background: linear-gradient(135deg, transparent, transparent);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    transition: background 0.4s ease;
}

.concept-card:hover::before {
    background: linear-gradient(135deg, var(--primary-500), var(--accent-500));
}

.concept-card:hover {
    transform: translateY(-2px);
    background: rgba(28, 25, 23, 0.76);
    box-shadow: 0 8px 28px rgba(0, 0, 0, 0.28);
}

/* =========================================
   CARD CONTENT
   ========================================= */
.card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.75rem;
}

.concept-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
    line-height: 1.3;
}

.concept-type-badge {
    font-size: 0.7rem;
    padding: 0.25rem 0.6rem;
    border-radius: 6px;
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.2);
    color: var(--primary-400);
    text-transform: uppercase;
    font-weight: 600;
    letter-spacing: 0.05em;
}

.concept-uri {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--accent-400);
    margin-bottom: 1rem;
    opacity: 0.8;
}

.concept-desc {
    font-size: 0.95rem;
    color: var(--text-muted);
    line-height: 1.65;
    margin-bottom: 1.5rem;
    display: block;
    position: relative;
    overflow: hidden;
    flex: 0 0 auto;
    min-height: calc(0.95rem * 1.65 * 3 + 0.5rem);
    max-height: calc(0.95rem * 1.65 * 3 + 0.5rem);
    padding-bottom: 0.5rem;
}

.concept-desc::after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 1.1rem;
    pointer-events: none;
    background: linear-gradient(to bottom, rgba(28, 25, 23, 0), rgba(28, 25, 23, 0.96));
}

.concept-meta {
    padding-top: 1rem;
    border-top: 1px solid var(--border-subtle);
    display: flex;
    gap: 1rem;
    font-size: 0.85rem;
    color: var(--text-disabled);
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.meta-item i {
    width: 14px;
    height: 14px;
}

.meta-item.meta-item-end {
    margin-left: auto;
}

/* =========================================
   EMPTY STATE
   ========================================= */
.empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: 4rem 1rem;
    color: var(--text-muted);
}

#noResults {
    display: none;
}

.empty-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.empty-icon i {
    width: 48px;
    height: 48px;
}

/* =========================================
   MARKDOWN CONTENT
   ========================================= */
.markdown-content {
    opacity: 0;
    transition: opacity 0.1s ease-in-out;
}

.concept-desc.markdown-content * {
    margin-bottom: 0.2rem;
    font-size: 0.95rem;
    line-height: inherit;
}

.concept-desc.markdown-content p {
    display: inline;
    margin: 0;
}

/* =========================================
   RESPONSIVE
   ========================================= */
@media (max-width: 768px) {
    .page-header {
        margin: 2rem 0 1.5rem;
    }
    
    .concept-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
        padding: 0 1rem 2rem;
    }
    
    .concept-card {
        padding: 1.25rem;
    }
    
    .view-toggle {
        flex-direction: column;
        width: 100%;
        max-width: 300px;
    }
    
    .toggle-btn {
        text-align: center;
    }
}