/* ========================================
   PRODUCT SUBPAGE STYLES
   Reusable components for features, use-cases, resources pages
   ======================================== */

/* ===== Subpage Navigation (product-nav.php) ===== */
.product-subnav {
    background: var(--white);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}

.subnav-list {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    gap: 0;
}

.subnav-list::-webkit-scrollbar {
    display: none;
}

.subnav-item {
    flex-shrink: 0;
}

.subnav-link {
    display: block;
    padding: 0.875rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-decoration: none;
    border-bottom: 3px solid transparent;
    transition: color var(--transition-fast), border-color var(--transition-fast);
    white-space: nowrap;
    min-height: var(--touch-min);
    line-height: 1.4;
}

.subnav-link:hover {
    color: var(--primary-color);
}

.subnav-item.active .subnav-link {
    color: var(--primary-dark);
    border-bottom-color: var(--primary-color);
    font-weight: 600;
}

/* ===== Page Header / Hero for sub-pages ===== */
.subpage-header {
    background: linear-gradient(135deg, rgba(30, 58, 95, 0.92) 0%, rgba(45, 106, 159, 0.88) 100%);
    padding: calc(80px + var(--spacing-xl)) 0 var(--spacing-xl);
    text-align: center;
    color: var(--white);
}

.subpage-header h1 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    color: var(--white);
    margin-bottom: 0.75rem;
    font-weight: 700;
}

.subpage-header p {
    font-size: clamp(0.9375rem, 2vw, 1.125rem);
    color: rgba(255,255,255,0.9);
    max-width: 700px;
    margin: 0 auto;
    line-height: 1.6;
}

/* ===== Breadcrumb (shared style) ===== */
.subpage-breadcrumb {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: rgba(255,255,255,0.7);
    padding: 1rem 0 0;
    max-width: 1200px;
    margin: 0 auto;
    padding-left: var(--spacing-md);
    padding-right: var(--spacing-md);
}

.subpage-breadcrumb a {
    color: rgba(255,255,255,0.75);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.subpage-breadcrumb a:hover {
    color: var(--white);
}

.subpage-breadcrumb span {
    color: rgba(255,255,255,0.65);
}

.subpage-breadcrumb > span:last-child {
    color: rgba(255,255,255,0.9);
    font-weight: 500;
}

/* ===== Section Shared ===== */
.subpage-section {
    padding: var(--spacing-xxl) 0;
}

.subpage-section:nth-child(even) {
    background: var(--light-color);
}

.subpage-section-title {
    font-size: 1.75rem;
    color: var(--primary-navy);
    text-align: center;
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.subpage-section-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    text-align: center;
    max-width: 700px;
    margin: 0 auto var(--spacing-xl);
    line-height: 1.6;
}

/* ===== Callout Box ===== */
.callout-box {
    border-radius: var(--radius-lg);
    padding: 1.5rem 1.75rem;
    margin-bottom: 1.5rem;
    border-left: 4px solid;
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

.callout-box i {
    font-size: 1.25rem;
    flex-shrink: 0;
    margin-top: 0.125rem;
}

.callout-box p {
    margin: 0;
    font-size: 0.9375rem;
    line-height: 1.6;
}

.callout-info {
    background: rgba(0, 147, 222, 0.08);
    border-left-color: var(--primary-color);
}

.callout-info i {
    color: var(--primary-color);
}

.callout-success {
    background: rgba(40, 167, 69, 0.08);
    border-left-color: var(--success-color);
}

.callout-success i {
    color: var(--success-color);
}

.callout-warning {
    background: rgba(255, 193, 7, 0.08);
    border-left-color: var(--warning-color);
}

.callout-warning i {
    color: var(--warning-color);
}

.callout-tip {
    background: rgba(23, 109, 184, 0.08);
    border-left-color: var(--accent-color);
}

.callout-tip i {
    color: var(--accent-color);
}

/* ===== Summary Card ===== */
.summary-card {
    background: var(--white);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    text-align: center;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.summary-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.summary-card .summary-number {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--primary-navy);
    line-height: 1.2;
    margin-bottom: 0.25rem;
}

.summary-card .summary-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin: 0;
}

.summary-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

/* ===== Step List ===== */
.step-list {
    list-style: none;
    padding: 0;
    margin: 0 0 2rem;
    counter-reset: step-counter;
}

.step-list li {
    counter-increment: step-counter;
    display: flex;
    gap: 1rem;
    padding: 1.25rem 0;
    border-bottom: 1px solid var(--border-color);
    align-items: flex-start;
}

.step-list li:last-child {
    border-bottom: none;
}

.step-list li::before {
    content: counter(step-counter);
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    background: var(--primary-navy);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1rem;
}

.step-list li h4 {
    margin: 0 0 0.25rem;
    font-size: 1.0625rem;
    color: var(--primary-navy);
}

.step-list li p {
    margin: 0;
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ===== Definition Box ===== */
.def-box {
    background: var(--white);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 1.5rem;
    margin-bottom: 1rem;
}

.def-box dt {
    font-weight: 700;
    color: var(--primary-navy);
    font-size: 1.0625rem;
    margin-bottom: 0.25rem;
}

.def-box dd {
    margin: 0;
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.def-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1rem;
}

/* ===== FAQ Section ===== */
.faq-section {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    margin-bottom: 0.75rem;
    overflow: hidden;
    background: var(--white);
}

.faq-question {
    width: 100%;
    text-align: left;
    padding: 1rem 1.25rem;
    background: none;
    border: none;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    min-height: var(--touch-min);
    transition: background var(--transition-fast);
}

.faq-question:hover {
    background: var(--light-color);
}

.faq-question::after {
    content: '\f078';
    font-family: 'Font Awesome 5 Free';
    font-weight: 900;
    font-size: 0.75rem;
    color: var(--text-muted);
    transition: transform var(--transition-fast);
    flex-shrink: 0;
}

.faq-question[aria-expanded="true"]::after {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
}

.faq-answer-inner {
    padding: 0 1.25rem 1rem;
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.faq-answer-inner p {
    margin: 0;
}

.faq-item.open .faq-answer {
    max-height: 500px;
}

/* ===== Comparison Table ===== */
.comparison-table-wrap {
    overflow-x: auto;
    margin-bottom: 2rem;
}

.comparison-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    font-size: 0.875rem;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.comparison-table thead {
    background: var(--primary-navy);
    color: var(--white);
}

.comparison-table th {
    padding: 1rem 1.25rem;
    text-align: left;
    font-weight: 600;
    font-size: 0.875rem;
}

.comparison-table td {
    padding: 0.875rem 1.25rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.comparison-table tbody tr:hover {
    background: var(--light-color);
}

.comparison-table .table-check {
    color: var(--success-color);
    font-weight: 700;
}

.comparison-table .table-cross {
    color: var(--danger-color);
}

/* ===== Resource Cards ===== */
.resource-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.resource-card {
    background: var(--white);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
    display: flex;
    flex-direction: column;
}

.resource-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.resource-card-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius);
    background: rgba(0, 147, 222, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
}

.resource-card-icon i {
    font-size: 1.25rem;
    color: var(--primary-color);
}

.resource-card h3 {
    font-size: 1.125rem;
    color: var(--primary-navy);
    margin-bottom: 0.5rem;
}

.resource-card p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1rem;
    flex-grow: 1;
}

.resource-card .btn-sm {
    align-self: flex-start;
}

/* ===== Use Case Cards ===== */
.usecase-detail-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    margin-bottom: 1.5rem;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.usecase-detail-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.usecase-detail-card h3 {
    font-size: 1.25rem;
    color: var(--primary-navy);
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.usecase-detail-card h3 i {
    color: var(--primary-color);
}

.usecase-detail-card p {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 0.75rem;
}

.usecase-detail-card ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.usecase-detail-card ul li {
    font-size: 0.875rem;
    color: var(--text-secondary);
    padding: 0.25rem 0;
    padding-left: 1.25rem;
    position: relative;
}

.usecase-detail-card ul li::before {
    content: "✓";
    color: var(--success-color);
    font-weight: 700;
    position: absolute;
    left: 0;
}

/* ===== Two Column Layout ===== */
.two-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    align-items: start;
}

@media (max-width: 768px) {
    .two-col {
        grid-template-columns: 1fr;
    }

    .subnav-link {
        padding: 0.75rem 1rem;
        font-size: 0.8125rem;
    }

    .subpage-header {
        padding: calc(65px + var(--spacing-lg)) 0 var(--spacing-lg);
    }

    .subpage-section-title {
        font-size: 1.5rem;
    }

    .faq-question {
        font-size: 0.9375rem;
        padding: 0.875rem 1rem;
    }

    .summary-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .subpage-header {
        padding: calc(60px + var(--spacing-md)) 0 var(--spacing-md);
    }

    .subpage-section-title {
        font-size: 1.25rem;
    }

    .summary-grid {
        grid-template-columns: 1fr;
    }

    .resource-grid {
        grid-template-columns: 1fr;
    }

    .usecase-detail-card {
        padding: 1.25rem;
    }
}

/* ===== Accessibility ===== */
@media (prefers-reduced-motion: reduce) {
    .product-subnav {
        position: static;
    }

    .faq-answer {
        transition: none;
    }

    .resource-card:hover,
    .usecase-detail-card:hover,
    .summary-card:hover {
        transform: none;
    }

    .faq-question::after {
        transition: none;
    }
}