/* =========================================
   Index Page - SELAB@HKNU
   ========================================= */

/* --- Layout (content area only, NOT hero) --- */
.home-page > .page-container {
    max-width: 1000px;
    margin-top: 36px;
    padding-top: 0;
    padding-bottom: 80px;
}
.home-page .hero-section .page-container {
    max-width: 1000px;
    padding-top: 0;
    padding-bottom: 0;
    margin-top: 0;
}

.main-content-wrapper {
    display: flex;
    flex-direction: column;
    gap: 40px;
}
.card-section {
    min-height: 0; /* flex item fix */
}

/* --- Hero --- */
.highlight-gold {
    color: #ffd700;
    font-weight: bold;
}

/* --- Card base --- */
.main-card {
    background: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 36px;
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s, box-shadow 0.2s;
}
.main-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}
.highlight-card {
    border-top: 4px solid var(--color-accent);
}

/* --- Card header (scoped to main-card only) --- */
.main-card > .card-header {
    margin-bottom: 28px;
    padding: 0;
    border-bottom: none;
}
.main-card .card-title {
    font-size: 1.65rem;
    font-weight: 800;
    margin: 10px 0 0;
    line-height: 1.35;
    color: var(--color-text-main);
}
.card-title__date {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-secondary);
    white-space: nowrap;
}
.main-card .badge {
    display: inline-block;
    padding: 6px 14px;
    border-radius: 99px;
    font-size: 0.82rem;
    font-weight: 700;
    background: var(--color-light-bg);
    color: var(--color-secondary);
}
.badge--accent {
    background: var(--color-accent-soft);
    color: var(--color-accent);
}

/* --- Card inner sections (uniform 32px gap) --- */
.main-card .recruit-details,
.main-card .support-section,
.main-card .contact-footer {
    margin-top: 32px;
}

/* --- Intro text + DL list --- */
.intro-text {
    font-size: 1.05rem;
    line-height: 1.75;
    color: var(--color-text-dark);
    margin-bottom: 24px;
}
.intro-text strong {
    color: var(--color-primary);
}
.intro-text dl {
    display: grid;
    gap: 18px;
    margin: 16px 0 0 4px;
}
.intro-text dt {
    margin-bottom: 4px;
}
.intro-text dd {
    font-size: 0.93rem;
    color: var(--color-text-sub);
    margin-left: 12px;
    line-height: 1.6;
}
.intro-closing {
    margin-top: 24px;
}

/* --- Recruit details (icon list) --- */
.recruit-details {
    padding-top: 28px;
    border-top: 1px solid var(--color-border);
}
.recruit-details .icon-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    gap: 24px;
}
.icon-list li {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}
.icon-list i {
    font-size: 1.4rem;
    color: var(--color-accent);
    background: var(--color-accent-soft);
    width: 42px;
    height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 11px;
    flex-shrink: 0;
}
.icon-list strong {
    display: block;
    font-size: 1.05rem;
    color: var(--color-text-main);
    margin-bottom: 6px;
    line-height: 1.3;
}
.icon-list p {
    margin: 0;
    color: var(--color-secondary);
    font-size: 0.92rem;
    line-height: 1.6;
}

/* --- Support section --- */
.support-section {
    background: var(--color-bg-light);
    padding: 28px;
    border-radius: var(--radius-lg);
    border: 1px dashed var(--color-border);
}
.sub-title {
    font-size: 1.15rem;
    font-weight: 700;
    margin: 0 0 20px;
    color: var(--color-text-dark);
    display: flex;
    align-items: center;
    gap: 8px;
}
.spec-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 16px;
}
.spec-box {
    background: white;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 20px;
    display: flex;
    gap: 14px;
    align-items: flex-start;
}
.highlight-box {
    background: #eff6ff;
    border-color: #dbeafe;
}
.spec-icon {
    font-size: 1.4rem;
    color: var(--color-secondary);
    flex-shrink: 0;
    width: 24px;
    text-align: center;
    margin-top: 1px;
}
.highlight-box .spec-icon { color: var(--color-accent); }
.spec-content h5 {
    margin: 0 0 8px;
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--color-text-main);
    line-height: 1.4;
}
.spec-content ul { margin: 0; padding: 0; list-style: none; }
.spec-content li {
    font-size: 0.88rem;
    color: var(--color-text-sub);
    margin-bottom: 4px;
    position: relative;
    padding-left: 12px;
    line-height: 1.55;
}
.spec-content li::before {
    content: "\2022";
    position: absolute;
    left: 0;
    color: var(--color-divider);
}

/* --- Contact footer (CTA) --- */
.contact-footer {
    text-align: center;
    border-top: 1px solid var(--color-border);
    padding-top: 28px;
}
.contact-footer p {
    margin-bottom: 14px;
    color: var(--color-secondary);
    font-size: 0.95rem;
}

/* --- Buttons (scoped to main-card only) --- */
.main-card .btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 11px 26px;
    border-radius: 99px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.2s;
    font-size: 0.93rem;
}
.main-card .btn--primary {
    background: var(--color-accent);
    color: white;
}
.main-card .btn--primary:hover {
    background: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.12);
}
.main-card .btn--outline {
    border: 1px solid var(--color-border);
    color: var(--color-text-main);
    background: white;
}
.main-card .btn--outline:hover {
    border-color: var(--color-accent);
    color: white;
    background: var(--color-accent);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.12);
}

/* --- SAC Conference card (flex row) --- */
.flex-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}
.card-header-sm { margin-bottom: 10px; }
.card-title-sm {
    font-size: 1.2rem;
    font-weight: 700;
    margin: 4px 0 0;
    display: inline-block;
    vertical-align: middle;
    margin-left: 8px;
    color: var(--color-text-main);
}
.text-content p {
    color: var(--color-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-top: 8px;
}

/* --- Responsive --- */
@media (max-width: 768px) {
    .home-page > .page-container { padding-top: 28px; }
    .main-card { padding: 24px; }
    .main-card > .card-body,
    .main-card > .recruit-details,
    .main-card > .support-section,
    .main-card > .contact-footer { margin-top: 24px; }
    .spec-grid { grid-template-columns: 1fr; }
    .flex-row { flex-direction: column; align-items: flex-start; }
    .action-content { width: 100%; margin-top: 12px; }
    .main-card .btn { width: 100%; justify-content: center; }
    .support-section { padding: 20px; }
    .recruit-details .icon-list { gap: 20px; }
}

@media (max-width: 480px) {
    .main-card { padding: 20px; }
    .main-card .card-title { font-size: 1.35rem; }
}

/* --- Hero eyebrow (Multi-Agent slogan) --- */
.hero-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 14px;
    border: 1px solid rgba(255, 215, 0, 0.5);
    background: rgba(255, 215, 0, 0.08);
    color: #ffd700;
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    border-radius: 999px;
    margin-bottom: 12px;
}
.hero-eyebrow i { font-size: 0.9rem; }

/* --- Research Pyramid (3-tier hierarchy) --- */
.research-pyramid {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin: 24px 0 20px;
}
.pyramid-tier {
    position: relative;
    display: flex;
    align-items: stretch;
    border-radius: 14px;
    overflow: hidden;
    background: #fff;
    border: 1px solid var(--color-border);
    transition: transform 0.2s, box-shadow 0.2s;
}
.pyramid-tier:hover {
    transform: translateX(4px);
    box-shadow: 0 6px 20px rgba(26, 58, 105, 0.08);
}
.pyramid-rank {
    flex-shrink: 0;
    width: 110px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    font-weight: 800;
    letter-spacing: 0.1em;
    color: #fff;
    text-align: center;
    padding: 0 10px;
}
.pyramid-body {
    flex: 1;
    padding: 16px 20px;
}
.pyramid-body h4 {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    font-size: 1.05rem;
    font-weight: 800;
    color: #1a3a69;
    margin: 0 0 6px 0;
}
.pyramid-body h4 i { color: currentColor; }
.pyramid-body p {
    font-size: 0.9rem;
    color: #4a5568;
    margin: 0;
    line-height: 1.55;
}
.pyramid-pill {
    font-size: 0.68rem;
    font-weight: 700;
    padding: 2px 8px;
    background: linear-gradient(135deg, #f59e0b, #ef4444);
    color: #fff;
    border-radius: 999px;
    letter-spacing: 0.03em;
}

/* Tier colors (top = Multi-Agent) */
.pyramid-tier--apex {
    border: 2px solid #1a3a69;
    box-shadow: 0 4px 14px rgba(26, 58, 105, 0.12);
}
.pyramid-tier--apex .pyramid-rank {
    background: linear-gradient(135deg, #1a3a69, #2d5a9e);
}
.pyramid-tier--apex .pyramid-body h4 { color: #1a3a69; }

.pyramid-tier--extension .pyramid-rank {
    background: linear-gradient(135deg, #3a7ca5, #5b9bd5);
}
.pyramid-tier--extension .pyramid-body h4 { color: #3a7ca5; }

.pyramid-tier--foundation .pyramid-rank {
    background: linear-gradient(135deg, #64748b, #94a3b8);
}
.pyramid-tier--foundation .pyramid-body h4 { color: #475569; }

@media (max-width: 640px) {
    .pyramid-tier { flex-direction: column; }
    .pyramid-rank {
        width: 100%;
        padding: 6px 10px;
        font-size: 0.65rem;
    }
    .pyramid-body { padding: 14px 16px; }
    .pyramid-body h4 { font-size: 0.98rem; }
    .pyramid-body p { font-size: 0.86rem; }
}

/* --- Flagship Bullet (Agentic SE & Multi-Agent) --- */
.icon-list__item--flagship {
    position: relative;
    padding: 18px 18px 18px 18px !important;
    background: linear-gradient(135deg, rgba(26, 58, 105, 0.04), rgba(245, 158, 11, 0.04)) !important;
    border: 2px solid #1a3a69 !important;
    border-radius: 14px;
    box-shadow: 0 4px 16px rgba(26, 58, 105, 0.1);
}
.icon-list__item--flagship > i {
    color: #1a3a69 !important;
    font-size: 1.6rem !important;
}
.icon-list__item--flagship > div strong {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}
.flagship-badge {
    display: inline-block;
    background: linear-gradient(135deg, #f59e0b, #ef4444);
    color: #fff;
    font-size: 0.68rem;
    font-weight: 800;
    padding: 3px 10px;
    border-radius: 999px;
    letter-spacing: 0.08em;
}