/* ===== RESET & BASE ===== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #0b3d5f;
    --primary-light: #1a5f8a;
    --primary-dark: #072a42;
    --accent: #e88d3b;
    --accent-light: #f0b87a;
    --bg-light: #f4f7fb;
    --bg-white: #ffffff;
    --text-dark: #1e2a3a;
    --text-medium: #3d4a5a;
    --text-light: #6b7a8a;
    --border-color: #dce3ec;
    --shadow: 0 8px 30px rgba(11, 61, 95, 0.10);
    --shadow-hover: 0 12px 40px rgba(11, 61, 95, 0.18);
    --radius: 12px;
    --transition: 0.25s ease;
}

html {
    scroll-behavior: smooth;
}

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

.container {
    max-width: 1300px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== HEADER ===== */
.header {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 60%, var(--primary-light) 100%);
    color: white;
    padding: 48px 0 40px;
    box-shadow: 0 4px 20px rgba(11, 61, 95, 0.25);
}

.header .container {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.header-badge {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(6px);
    padding: 6px 18px 6px 14px;
    border-radius: 40px;
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.3px;
    border: 1px solid rgba(255, 255, 255, 0.10);
    margin-bottom: 20px;
}

.header-badge i {
    font-size: 1rem;
}

.header h1 {
    font-size: 2.6rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    margin-bottom: 10px;
}

.subtitle {
    font-size: 1.15rem;
    font-weight: 300;
    opacity: 0.90;
    max-width: 700px;
    margin-bottom: 16px;
}

.header-meta {
    display: flex;
    gap: 30px;
    font-size: 0.95rem;
    opacity: 0.80;
}

.header-meta i {
    margin-right: 6px;
}

/* ===== SUMMARY ===== */
.summary {
    padding: 32px 0 24px;
    background: var(--bg-white);
    border-bottom: 1px solid var(--border-color);
}

.summary-card {
    display: flex;
    align-items: flex-start;
    gap: 24px;
    background: #f0f5ff;
    padding: 24px 28px;
    border-radius: var(--radius);
    border-left: 5px solid var(--accent);
}

.summary-icon {
    flex-shrink: 0;
    font-size: 2.2rem;
    color: var(--accent);
    padding-top: 4px;
}

.summary-content h2 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 6px;
}

.summary-content p {
    color: var(--text-medium);
    font-size: 1.02rem;
}

.summary-content strong {
    color: var(--primary-dark);
}

/* ===== SOURCES SECTION ===== */
.sources {
    padding: 40px 0 32px;
}

.section-header {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 24px;
}

.section-header h2 {
    font-size: 1.6rem;
    font-weight: 600;
    color: var(--primary-dark);
    display: flex;
    align-items: center;
    gap: 12px;
}

.section-header h2 i {
    color: var(--accent);
}

.filter-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.filter-btn {
    background: var(--bg-white);
    border: 1px solid var(--border-color);
    padding: 8px 16px;
    border-radius: 30px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-medium);
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.filter-btn i {
    font-size: 0.9rem;
}

.filter-btn:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
    transform: translateY(-1px);
}

.filter-btn.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
    box-shadow: 0 4px 12px rgba(11, 61, 95, 0.20);
}

/* ===== TABLE ===== */
.table-wrapper {
    background: var(--bg-white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.sources-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
}

.sources-table thead {
    background: var(--primary-dark);
    color: white;
}

.sources-table th {
    padding: 16px 18px;
    text-align: left;
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.sources-table th i {
    margin-right: 6px;
}

.sources-table td {
    padding: 16px 18px;
    vertical-align: top;
    border-bottom: 1px solid var(--border-color);
}

.sources-table tbody tr {
    transition: background 0.2s ease, transform 0.15s ease;
    cursor: default;
}

.sources-table tbody tr:hover {
    background: #f0f5ff;
    transform: scale(1.002);
}

.sources-table tbody tr:last-child td {
    border-bottom: none;
}

.source-name {
    font-weight: 600;
    color: var(--primary);
}

.source-type {
    display: inline-block;
    background: var(--bg-light);
    padding: 2px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-medium);
    margin-top: 4px;
    letter-spacing: 0.2px;
}

.source-context {
    color: var(--text-medium);
    font-size: 0.92rem;
}

.source-context strong {
    color: var(--text-dark);
}

.source-citation {
    font-style: italic;
    color: var(--text-medium);
    font-size: 0.90rem;
    background: #f8fafc;
    padding: 6px 12px;
    border-radius: 6px;
    border-left: 3px solid var(--accent-light);
}

.source-tag {
    display: inline-block;
    background: var(--primary);
    color: white;
    padding: 4px 14px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.2px;
    white-space: nowrap;
}

.source-tag.conference {
    background: #6c5b7b;
}
.source-tag.thesis {
    background: #2d6a4f;
}
.source-tag.journal {
    background: #b9770e;
}
.source-tag.research {
    background: #1e6091;
}

/* ===== TABLE FOOTER ===== */
.table-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 18px;
    background: #fafbfc;
    border-top: 1px solid var(--border-color);
    font-size: 0.90rem;
    color: var(--text-light);
}

.table-footer i {
    margin-right: 6px;
    color: var(--accent);
}

#rowCount {
    font-weight: 500;
    color: var(--text-medium);
}

/* ===== CONCLUSION ===== */
.conclusion {
    padding: 32px 0 40px;
    background: var(--bg-white);
    border-top: 1px solid var(--border-color);
}

.conclusion-box {
    display: flex;
    gap: 24px;
    align-items: flex-start;
    background: linear-gradient(135deg, #f8f4ee 0%, #fefcf9 100%);
    padding: 32px 36px;
    border-radius: var(--radius);
    border: 1px solid #e8ddd0;
}

.conclusion-icon {
    flex-shrink: 0;
    font-size: 2.6rem;
    color: var(--accent);
}

.conclusion-text h3 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--primary-dark);
    margin-bottom: 8px;
}

.conclusion-text blockquote {
    font-size: 1.12rem;
    line-height: 1.7;
    color: var(--text-dark);
    font-weight: 400;
    padding-left: 16px;
    border-left: 4px solid var(--accent);
    font-style: italic;
}

/* ===== FOOTER ===== */
.footer {
    background: var(--primary-dark);
    color: rgba(255, 255, 255, 0.75);
    padding: 28px 0;
    text-align: center;
    font-size: 0.92rem;
}

.footer .container {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.footer-small {
    font-size: 0.80rem;
    opacity: 0.65;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
    .sources-table {
        font-size: 0.88rem;
    }
    .sources-table th,
    .sources-table td {
        padding: 12px 14px;
    }
}

@media (max-width: 820px) {
    .section-header {
        flex-direction: column;
        align-items: stretch;
    }
    .filter-controls {
        justify-content: center;
    }
    .source-citation {
        font-size: 0.85rem;
        padding: 4px 10px;
    }
}

@media (max-width: 700px) {
    .header h1 {
        font-size: 1.9rem;
    }
    .subtitle {
        font-size: 1rem;
    }
    .header-meta {
        flex-direction: column;
        gap: 4px;
        font-size: 0.85rem;
    }

    .table-wrapper {
        overflow-x: auto;
    }

    .sources-table {
        font-size: 0.82rem;
        min-width: 600px;
    }

    .sources-table th,
    .sources-table td {
        padding: 10px 12px;
    }

    .summary-card {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
        padding: 18px 20px;
    }

    .conclusion-box {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
        padding: 24px 20px;
    }

    .conclusion-text blockquote {
        font-size: 1rem;
        padding-left: 12px;
    }

    .table-footer {
        flex-direction: column;
        gap: 6px;
        text-align: center;
    }

    .filter-btn {
        font-size: 0.78rem;
        padding: 6px 12px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    .header {
        padding: 32px 0 28px;
    }
    .header h1 {
        font-size: 1.6rem;
    }
    .summary-content p {
        font-size: 0.95rem;
    }
    .sources-table {
        font-size: 0.78rem;
        min-width: 500px;
    }
    .source-tag {
        font-size: 0.65rem;
        padding: 2px 10px;
    }
    .source-citation {
        font-size: 0.78rem;
        padding: 4px 8px;
    }
}