/* style.css - Design System for IX SILUBESA Proceedings */

/* Typography & Google Fonts import */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800&display=swap');

/* Color Variables and Theme Definition */
:root {
    /* Fonts */
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Inter', sans-serif;

    /* Theme Transition */
    --theme-transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;

    /* Light Theme Palette */
    --bg-app: #f4f6fa;
    --bg-header: linear-gradient(135deg, #0d3b66 0%, #0077b6 100%);
    --bg-card: rgba(255, 255, 255, 0.9);
    --bg-card-hover: #ffffff;
    --bg-modal: rgba(255, 255, 255, 0.95);
    
    --border-color: rgba(0, 119, 182, 0.15);
    --border-color-hover: rgba(0, 119, 182, 0.35);

    --text-primary: #1d2d44;
    --text-secondary: #5c677d;
    --text-on-header: #ffffff;

    --accent-primary: #0077b6;
    --accent-secondary: #00b4d8;
    --accent-green: #2ec4b6;
    --accent-orange: #f77f00;

    --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
    --shadow-md: 0 10px 15px -3px rgba(0, 119, 182, 0.05), 0 4px 6px -2px rgba(0, 119, 182, 0.03);
    --shadow-lg: 0 20px 25px -5px rgba(0, 119, 182, 0.1), 0 10px 10px -5px rgba(0, 119, 182, 0.04);
    
    --glass-blur: blur(12px);
}

[data-theme="dark"] {
    /* Dark Theme Palette */
    --bg-app: #080b11;
    --bg-header: linear-gradient(135deg, #091325 0%, #0f253d 100%);
    --bg-card: rgba(18, 26, 41, 0.65);
    --bg-card-hover: rgba(26, 38, 61, 0.85);
    --bg-modal: rgba(13, 20, 33, 0.96);

    --border-color: rgba(255, 255, 255, 0.07);
    --border-color-hover: rgba(0, 180, 216, 0.3);

    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --text-on-header: #f8fafc;

    --accent-primary: #00b4d8;
    --accent-secondary: #90e0ef;
    --accent-green: #4ade80;
    --accent-orange: #fb923c;

    --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.2), 0 2px 4px -1px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.4), 0 10px 10px -5px rgba(0, 0, 0, 0.3);
}

/* Global resets and standards */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: var(--bg-app);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 15px;
    line-height: 1.6;
    transition: var(--theme-transition);
    overflow-x: hidden;
}

/* Layout Main Grid */
.container {
    max-width: 1300px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header & Banner styling */
header {
    background: var(--bg-header);
    color: var(--text-on-header);
    padding: 48px 0 64px 0;
    position: relative;
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
    overflow: hidden;
}

header::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -20%;
    width: 80%;
    height: 200%;
    background: radial-gradient(circle, rgba(0, 180, 216, 0.15) 0%, transparent 60%);
    pointer-events: none;
}

.header-grid {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 24px;
    position: relative;
    z-index: 2;
}

.brand h1 {
    font-family: var(--font-heading);
    font-size: 2.2rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    margin-bottom: 6px;
    background: linear-gradient(120deg, #ffffff 30%, var(--accent-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.brand p {
    font-size: 1.05rem;
    font-weight: 300;
    opacity: 0.9;
    letter-spacing: 0.2px;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

/* Theme Switch button */
.theme-btn {
    background: rgba(255, 255, 255, 0.1);
    color: #ffffff;
    border: 1px solid rgba(255, 255, 255, 0.2);
    width: 44px;
    height: 44px;
    border-radius: 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    transition: all 0.2s ease;
    box-shadow: var(--shadow-sm);
}

.theme-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.4);
    transform: translateY(-2px);
}

.theme-btn:active {
    transform: translateY(0);
}

/* Prefaces / Messages Section */
.prefaces-container {
    display: flex;
    gap: 16px;
    margin-top: 16px;
}

.preface-link {
    background: rgba(255, 255, 255, 0.08);
    color: #ffffff;
    border: 1px solid rgba(255, 255, 255, 0.15);
    padding: 10px 18px;
    border-radius: 8px;
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all 0.2s ease;
}

.preface-link:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: var(--accent-secondary);
    transform: translateY(-2px);
}

/* Main Grid Layout: Search Panel + Articles Grid */
.main-layout {
    margin-top: -30px;
    padding-bottom: 80px;
    position: relative;
    z-index: 5;
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 32px;
}

/* Sidebar & Search Box Styling */
.search-sidebar {
    position: sticky;
    top: 32px;
    height: fit-content;
}

.glass-panel {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-radius: 20px;
    padding: 24px;
    box-shadow: var(--shadow-md);
    transition: var(--theme-transition);
}

.sidebar-section {
    margin-bottom: 24px;
}

.sidebar-section:last-child {
    margin-bottom: 0;
}

.sidebar-title {
    font-family: var(--font-heading);
    font-size: 1rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    margin-bottom: 12px;
    color: var(--accent-primary);
}

/* Custom Styled Input Controls */
.input-wrapper {
    position: relative;
    width: 100%;
}

.input-wrapper i {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
    pointer-events: none;
}

.search-input {
    width: 100%;
    padding: 12px 14px 12px 42px;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.95rem;
    outline: none;
    transition: all 0.2s ease;
}

.search-input:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(0, 180, 216, 0.15);
    background: var(--bg-card-hover);
}

/* Theme / Tag Buttons List */
.theme-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
    max-height: 400px;
    overflow-y: auto;
    padding-right: 4px;
}

.theme-list::-webkit-scrollbar {
    width: 5px;
}

.theme-list::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

.theme-item {
    width: 100%;
    text-align: left;
    background: transparent;
    border: 1px solid transparent;
    padding: 10px 14px;
    border-radius: 8px;
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.88rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.theme-item:hover {
    background: rgba(0, 180, 216, 0.08);
    color: var(--accent-primary);
}

.theme-item.active {
    background: var(--accent-primary);
    color: #ffffff;
}

.theme-badge {
    font-size: 0.75rem;
    background: var(--border-color);
    padding: 2px 8px;
    border-radius: 20px;
    color: var(--text-secondary);
}

.theme-item.active .theme-badge {
    background: rgba(255, 255, 255, 0.25);
    color: #ffffff;
}

/* Statistics widgets in sidebar */
.stats-widget {
    background: rgba(0, 119, 182, 0.04);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 16px;
    text-align: center;
}

.stats-num {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent-primary);
    line-height: 1.2;
}

.stats-label {
    font-size: 0.82rem;
    color: var(--text-secondary);
    margin-top: 4px;
}

/* Main content: Results Summary & Cards Grid */
.content-area {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
}

.results-count {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.results-count strong {
    color: var(--text-primary);
}

/* Clean Cards Grid */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
    gap: 20px;
}

/* Article Card Design */
.article-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 24px;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    cursor: pointer;
    min-height: 240px;
}

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

.card-top {
    margin-bottom: 16px;
}

.card-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.5px;
}

.card-code {
    background: rgba(0, 180, 216, 0.12);
    color: var(--accent-primary);
    padding: 3px 8px;
    border-radius: 6px;
}

.card-theme-tag {
    color: var(--text-secondary);
    text-transform: uppercase;
}

.card-title {
    font-family: var(--font-heading);
    font-size: 1.05rem;
    font-weight: 600;
    line-height: 1.4;
    color: var(--text-primary);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 12px;
    transition: color 0.2s ease;
}

.article-card:hover .card-title {
    color: var(--accent-primary);
}

.card-authors {
    font-size: 0.82rem;
    color: var(--text-secondary);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card-bottom {
    margin-top: auto;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
}

.card-keywords {
    font-size: 0.75rem;
    color: var(--text-secondary);
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.keyword-badge {
    background: rgba(0, 0, 0, 0.03);
    padding: 2px 6px;
    border-radius: 4px;
    border: 1px solid var(--border-color);
}

[data-theme="dark"] .keyword-badge {
    background: rgba(255, 255, 255, 0.03);
}

.view-btn {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--accent-primary);
    display: inline-flex;
    align-items: center;
    gap: 4px;
    background: transparent;
    border: none;
    cursor: pointer;
}

.view-btn i {
    transition: transform 0.2s ease;
}

.article-card:hover .view-btn i {
    transform: translateX(3px);
}

/* Direct PDF link buttons on cards */
.card-pdf-btn {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 6px 12px;
    border-radius: 8px;
    font-size: 0.82rem;
    font-weight: 600;
    text-decoration: none;
    background: rgba(0, 180, 216, 0.06);
    border: 1px solid var(--border-color);
    color: var(--accent-primary);
    transition: all 0.2s ease;
}

.card-pdf-btn:hover:not(.disabled) {
    background: var(--accent-primary);
    color: #ffffff;
    border-color: var(--accent-primary);
    transform: translateY(-1px);
}

.card-pdf-btn.disabled {
    background: transparent;
    border-color: var(--border-color);
    color: var(--text-secondary);
    cursor: not-allowed;
    opacity: 0.5;
}

/* Modal details Overlay styling */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(8, 11, 17, 0.6);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.modal-overlay.open {
    opacity: 1;
    pointer-events: auto;
}

.modal-content {
    background: var(--bg-modal);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    width: 100%;
    max-width: 800px;
    max-height: 85vh;
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
    transform: scale(0.95) translateY(10px);
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.modal-overlay.open .modal-content {
    transform: scale(1) translateY(0);
}

.modal-header {
    padding: 24px 32px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 20px;
}

.modal-header-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 8px;
    font-size: 0.82rem;
    font-weight: 600;
}

.modal-title {
    font-family: var(--font-heading);
    font-size: 1.35rem;
    font-weight: 700;
    line-height: 1.3;
    color: var(--text-primary);
}

.close-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 1.4rem;
    cursor: pointer;
    transition: color 0.2s ease;
    padding: 4px;
}

.close-btn:hover {
    color: var(--text-primary);
}

.modal-body {
    padding: 32px;
    overflow-y: auto;
    flex-grow: 1;
}

.modal-section {
    margin-bottom: 24px;
}

.modal-section:last-child {
    margin-bottom: 0;
}

.section-label {
    font-family: var(--font-heading);
    font-size: 0.88rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: var(--accent-primary);
    margin-bottom: 8px;
}

.modal-authors-list {
    font-size: 1.05rem;
    font-weight: 500;
    color: var(--text-primary);
}

.modal-abstract {
    font-size: 0.95rem;
    color: var(--text-primary);
    line-height: 1.7;
    text-align: justify;
    background: rgba(0, 119, 182, 0.03);
    border-left: 3px solid var(--accent-primary);
    padding: 16px 20px;
    border-radius: 0 12px 12px 0;
}

.modal-keywords-list {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.modal-keyword-badge {
    background: rgba(0, 180, 216, 0.08);
    border: 1px solid var(--border-color-hover);
    color: var(--accent-primary);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.82rem;
    font-weight: 500;
}

.modal-footer {
    padding: 20px 32px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    background: rgba(0, 0, 0, 0.01);
    border-radius: 0 0 24px 24px;
}

[data-theme="dark"] .modal-footer {
    background: rgba(255, 255, 255, 0.01);
}

/* Action button styles */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: 10px;
    font-family: var(--font-body);
    font-size: 0.88rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 1px solid transparent;
}

.btn-secondary {
    background: transparent;
    border-color: var(--border-color-hover);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: rgba(0, 0, 0, 0.03);
}

[data-theme="dark"] .btn-secondary:hover {
    background: rgba(255, 255, 255, 0.05);
}

.btn-primary {
    background: var(--accent-primary);
    color: #ffffff;
    box-shadow: 0 4px 10px rgba(0, 180, 216, 0.2);
}

.btn-primary:hover {
    background: var(--accent-secondary);
    box-shadow: 0 6px 15px rgba(0, 180, 216, 0.35);
    transform: translateY(-1px);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-disabled {
    background: var(--border-color);
    color: var(--text-secondary);
    cursor: not-allowed;
    box-shadow: none;
}

.btn-disabled:hover {
    background: var(--border-color);
    transform: none;
    box-shadow: none;
}

.pdf-warning {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.82rem;
    color: var(--accent-orange);
    margin-right: auto;
    font-weight: 500;
}

/* Responsive adjust details */
@media(max-width: 992px) {
    .main-layout {
        grid-template-columns: 1fr;
    }
    
    .search-sidebar {
        position: static;
    }
}

@media(max-width: 576px) {
    .brand h1 {
        font-size: 1.8rem;
    }
    
    .prefaces-container {
        flex-direction: column;
        width: 100%;
    }
    
    .preface-link {
        justify-content: center;
    }
    
    .modal-content {
        max-height: 95vh;
        border-radius: 16px;
    }
    
    .modal-header, .modal-body, .modal-footer {
        padding: 16px 20px;
    }
    
    .articles-grid {
        grid-template-columns: 1fr;
    }
}