/* General Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

/* Header & Navigation */
header {
    background-color: #0066cc;
    padding: 1rem 2rem;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
}

.nav-links a {
    color: white;
    text-decoration: none;
    margin-right: 20px;
    font-weight: 500;
    transition: opacity 0.3s;
}

.nav-links a:hover {
    opacity: 0.7;
}

.nav-icon i {
    color: white;
    font-size: 1.5rem;
    transition: transform 0.3s;
}

.nav-icon i:hover {
    transform: scale(1.1);
}

/* HERO SECTION */
.hero-section {
    height: 70vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: white;
    background: linear-gradient(rgba(0, 0, 0, 0.45), rgba(0, 0, 0, 0.45)),
                url('images/bg-hero.gif') no-repeat center center/cover;
    background-color: #1a3a5c;
}

.hero-content h1 {
    font-size: 3rem;
    font-weight: 700;
    line-height: 1.2;
    text-shadow: 2px 2px 10px rgba(0, 0, 0, 0.5);
    margin-bottom: 1rem;
}

.hero-content h3 {
    font-size: 1.3rem;
    font-weight: 400;
    opacity: 0.9;
    text-shadow: 1px 1px 6px rgba(0, 0, 0, 0.4);
}

/* PAGE HEADER (for inner pages) */
.page-header {
    background: linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)),
                url('images/bg-header.gif') no-repeat center center/cover;
    background-color: #004a99;
    color: white;
    padding: 3rem 2rem;
    text-align: center;
}

.page-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.page-header p {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* SECTION WRAPPER */
.section {
    padding: 4rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.section-alt {
    background-color: #f7f9fc;
    padding: 4rem 2rem;
}

.section-alt .section-inner {
    max-width: 1200px;
    margin: 0 auto;
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    color: #0066cc;
    margin-bottom: 0.5rem;
    text-align: center;
}

.section-subtitle {
    text-align: center;
    color: #666;
    margin-bottom: 2.5rem;
    font-size: 1rem;
}

.section-divider {
    border: none;
    border-top: 3px solid #0066cc;
    width: 60px;
    margin: 0.5rem auto 2.5rem;
}

/* OVERVIEW TEXT BOX */
.text-box {
    color: #555;
    max-width: 860px;
    margin: 0 auto;
    line-height: 1.8;
    font-size: 1.05rem;
}

/* ALGORITHM SCROLL — plain text flow */
.algorithm-scroll {
    display: flex;
    flex-direction: column;
    gap: 0;
    margin-top: 2rem;
    max-width: 860px;
    margin-left: auto;
    margin-right: auto;
}

.algorithm-row {
    padding: 2.5rem 0;
    border-bottom: 1px solid #e4eaf2;
}

.algorithm-row:last-child {
    border-bottom: none;
}

.algo-row-label {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.6rem;
}

.algo-row-label h3 {
    font-size: 1.25rem;
    color: #1a1a2e;
    font-weight: 700;
}

.algo-row-content {
    padding: 0;
}

.algo-row-content p {
    color: #555;
    line-height: 1.75;
    font-size: 0.97rem;
    margin-bottom: 1rem;
}

.algo-tag {
    display: inline-block;
    background: #0066cc;
    color: white;
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    padding: 0.22rem 0.65rem;
    border-radius: 4px;
}

.algo-tag.dynamic {
    background: #e05c00;
}

.algo-tag.reactive {
    background: #007a44;
}

.algo-tag.hybrid {
    background: #6a0dad;
}

.algo-features {
    list-style: none;
    padding: 0;
}

.algo-features li {
    color: #555;
    font-size: 0.95rem;
    line-height: 1.7;
    padding-left: 1.2rem;
    position: relative;
}

.algo-features li::before {
    content: "›";
    color: #0066cc;
    font-weight: bold;
    position: absolute;
    left: 0;
}

/* PROS CONS INLINE (inside scroll rows) */
.pros-cons-inline {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.pros-heading {
    display: block;
    color: #007a44;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 0.5rem;
}

.cons-heading {
    display: block;
    color: #cc2200;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 0.5rem;
}

/* VIDEO SECTION */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.video-card {
    background: white;
    border-radius: 10px;
    overflow: hidden;
    border: 1px solid #e0e8f0;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.07);
}

.video-embed {
    width: 100%;
    aspect-ratio: 16 / 9;
    background: #dde6f0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #888;
    font-size: 0.9rem;
    text-align: center;
    border-radius: 6px;
}

.video-embed iframe {
    width: 100%;
    height: 100%;
    border: none;
    border-radius: 6px;
}

/* Constrain video embed inside a scroll row */
.algo-row-content .video-embed {
    max-width: 560px;
}

.video-info {
    padding: 1rem 1.25rem;
}

.video-info h4 {
    color: #1a1a2e;
    font-size: 1rem;
    margin-bottom: 0.3rem;
}

.video-info p {
    color: #666;
    font-size: 0.88rem;
    line-height: 1.5;
}

/* RESULTS TABLE */
.results-table-wrapper {
    overflow-x: auto;
    border-radius: 8px;
    border: 1px solid #d0dce8;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
}

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

.results-table thead {
    background: #0066cc;
    color: white;
}

.results-table thead th {
    padding: 0.9rem 1.2rem;
    text-align: left;
    font-weight: 600;
    font-size: 0.9rem;
    letter-spacing: 0.03em;
}

.results-table tbody tr {
    border-bottom: 1px solid #e8eef5;
    transition: background 0.15s;
}

.results-table tbody tr:hover {
    background: #f0f6ff;
}

.results-table tbody td {
    padding: 0.85rem 1.2rem;
    color: #333;
}

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

.results-table .algo-label {
    font-weight: 600;
    color: #0066cc;
}

.results-table .fail {
    color: #cc2200;
    font-weight: 600;
}

.results-table .fail-partial {
    color: #b87000;
    font-weight: 600;
}

.results-table .group-header td {
    background: #e8f0fb;
    color: #0066cc;
    font-weight: 700;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    padding: 0.5rem 1.2rem;
}

/* PROS CONS */
.pros-cons-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.pros-cons-card {
    background: white;
    border-radius: 10px;
    padding: 1.5rem;
    border: 1px solid #e0e8f0;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
}

.pros-cons-card h4 {
    font-size: 1.05rem;
    color: #1a1a2e;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid #e0e8f0;
}

.pros-list,
.cons-list {
    list-style: none;
    padding: 0;
    margin-bottom: 0.75rem;
}

.pros-list li,
.cons-list li {
    font-size: 0.9rem;
    color: #444;
    padding: 0.3rem 0;
    padding-left: 1.4rem;
    position: relative;
    line-height: 1.5;
}

.pros-list li::before {
    content: "✓";
    color: #007a44;
    font-weight: bold;
    position: absolute;
    left: 0;
}

.cons-list li::before {
    content: "✗";
    color: #cc2200;
    font-weight: bold;
    position: absolute;
    left: 0;
}

/* SOURCES */
.sources-section {
    max-width: 900px;
    margin: 0 auto;
}

.source-group {
    margin-bottom: 2.5rem;
}

.source-group h3 {
    font-size: 1.2rem;
    color: #0066cc;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.source-group h3 i {
    font-size: 1rem;
}

.source-list {
    list-style: none;
    padding: 0;
}

.source-list li {
    background: white;
    border: 1px solid #e0e8f0;
    border-radius: 8px;
    padding: 1rem 1.25rem;
    margin-bottom: 0.75rem;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
    transition: border-color 0.2s;
}

.source-list li:hover {
    border-color: #0066cc;
}

.source-list a {
    color: #0066cc;
    text-decoration: none;
    font-weight: 500;
    font-size: 0.98rem;
}

.source-list a:hover {
    text-decoration: underline;
}

.source-list .source-desc {
    display: block;
    color: #666;
    font-size: 0.88rem;
    margin-top: 0.25rem;
    line-height: 1.5;
}

.lit-review-box {
    background: white;
    border: 1px solid #e0e8f0;
    border-left: 4px solid #0066cc;
    border-radius: 8px;
    padding: 1.5rem 1.75rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.lit-review-box h4 {
    color: #1a1a2e;
    font-size: 1.05rem;
    margin-bottom: 0.5rem;
}

.lit-review-box p {
    color: #555;
    font-size: 0.93rem;
    line-height: 1.7;
}

.lit-review-box .authors {
    color: #0066cc;
    font-size: 0.88rem;
    margin-top: 0.5rem;
    font-style: italic;
}

/* PDF VIEWER */
.pdf-viewer-wrapper {
    margin-top: 1.25rem;
    border: 1px solid #d0dcea;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
}

.pdf-viewer-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: #0066cc;
    color: white;
    padding: 0.6rem 1rem;
    font-size: 0.92rem;
    font-weight: 500;
}

.pdf-viewer-header i.fa-file-pdf {
    font-size: 1rem;
}

.pdf-download-link {
    margin-left: auto;
    color: white;
    text-decoration: none;
    font-size: 0.85rem;
    background: rgba(255, 255, 255, 0.2);
    padding: 0.25rem 0.65rem;
    border-radius: 4px;
    transition: background 0.2s;
}

.pdf-download-link:hover {
    background: rgba(255, 255, 255, 0.35);
}

.pdf-viewer {
    display: block;
    width: 100%;
    height: 780px;
    border: none;
    background: #f5f5f5;
}

/* ABOUT / TEAM MEMBERS */
.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.75rem;
    margin-top: 2rem;
}

.team-card {
    background: white;
    border-radius: 12px;
    padding: 2rem 1.5rem;
    text-align: center;
    border: 1px solid #e0e8f0;
    box-shadow: 0 4px 16px rgba(0, 102, 204, 0.08);
    transition: transform 0.2s, box-shadow 0.2s;
}

.team-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 28px rgba(0, 102, 204, 0.14);
}

.team-avatar {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #0066cc, #004a99);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    font-size: 2rem;
    color: white;
    font-weight: 700;
}

.team-card h3 {
    font-size: 1.15rem;
    color: #1a1a2e;
    margin-bottom: 0.3rem;
}

.team-card .team-role {
    color: #0066cc;
    font-size: 0.88rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.75rem;
}

.team-card .team-bio {
    color: #666;
    font-size: 0.9rem;
    line-height: 1.6;
    margin-bottom: 1rem;
}

.team-links {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
}

.team-links a {
    color: #0066cc;
    font-size: 1.1rem;
    transition: color 0.2s, transform 0.2s;
}

.team-links a:hover {
    color: #004a99;
    transform: scale(1.15);
}

/* ACKNOWLEDGEMENTS */
.acknowledgement-cards {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 1rem;
}

.ack-card {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    background: #f4f8ff;
    border: 1px solid #d0dcea;
    border-left: 4px solid #0066cc;
    border-radius: 8px;
    padding: 1rem 1.25rem;
}

.ack-avatar {
    width: 52px;
    height: 52px;
    min-width: 52px;
    background: linear-gradient(135deg, #0066cc, #004a99);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    font-weight: 700;
    color: white;
}

.ack-info h4 {
    color: #1a1a2e;
    font-size: 1rem;
    margin-bottom: 0.2rem;
}

.ack-info h4 a {
    color: #0066cc;
    text-decoration: none;
}

.ack-info h4 a:hover {
    text-decoration: underline;
}

.ack-info p {
    color: #555;
    font-size: 0.88rem;
}

/* FOOTER */
footer {
    background: #1a1a2e;
    color: #aab;
    text-align: center;
    padding: 2rem;
    font-size: 0.9rem;
    margin-top: 0;
}

footer a {
    color: #7ab3f5;
    text-decoration: none;
}

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

/* UTILITY */
.text-center { text-align: center; }
.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }