/* ============================================================================
   Basics Page — Editorial layout for Don Zipperian's "Metallographic Specimen
   Preparation Basics" paper. 9 step sections with image, narrative, inline
   data tables, and embedded guide cards.
   ============================================================================ */

/* Backward-compat: a.resource-card was used by the old hub layout and is
   still used by the "Keep exploring" footer grid. */
a.resource-card {
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
}

a.resource-card:hover {
    color: inherit;
}

/* ---- Hero ------------------------------------------------------------------ */

.basics-hero {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    align-items: center;
    margin-bottom: 3rem;
    padding-bottom: 2.5rem;
    border-bottom: 1px solid #e5e7eb;
}

@media (min-width: 900px) {
    .basics-hero {
        grid-template-columns: 1.15fr 1fr;
        gap: 3.5rem;
    }
}

.basics-eyebrow {
    font-size: 0.75rem;
    font-weight: 600;
    color: #2563eb;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin: 0 0 0.75rem;
}

.basics-hero h1 {
    font-size: clamp(1.875rem, 4vw, 2.75rem);
    font-weight: 700;
    color: #0f172a;
    line-height: 1.15;
    margin: 0 0 0.5rem;
    letter-spacing: -0.01em;
}

.basics-byline {
    font-size: 0.95rem;
    color: #4b5563;
    margin: 0 0 1.25rem;
}

.basics-byline strong {
    color: #111827;
}

.basics-lede {
    font-size: 1.0625rem;
    line-height: 1.65;
    color: #1f2937;
    margin: 0 0 0.9rem;
}

.basics-lede-cont {
    font-size: 0.9375rem;
    line-height: 1.65;
    color: #374151;
    margin: 0 0 1.5rem;
}

.basics-hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    align-items: center;
}

.basics-hero-actions .btn-modern-outline svg {
    margin-right: 0.4rem;
    vertical-align: -3px;
}

.basics-hero-media {
    position: relative;
    border-radius: 0.875rem;
    overflow: hidden;
    box-shadow: 0 12px 32px -12px rgba(15, 23, 42, 0.25);
    aspect-ratio: 4 / 3;
    background: #f3f4f6;
}

.basics-hero-media img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

/* ---- Step navigation ------------------------------------------------------- */

.basics-step-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    padding: 1rem;
    margin: 0 0 3rem;
    background: linear-gradient(135deg, #f8fafc 0%, #eef2ff 100%);
    border: 1px solid #e0e7ff;
    border-radius: 0.875rem;
}

.basics-step-nav a {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.875rem;
    border-radius: 9999px;
    background: #ffffff;
    color: #1f2937;
    font-size: 0.8125rem;
    font-weight: 500;
    text-decoration: none;
    border: 1px solid #e5e7eb;
    transition: border-color 0.15s, color 0.15s, transform 0.15s;
    white-space: nowrap;
}

.basics-step-nav a:hover {
    border-color: #2563eb;
    color: #2563eb;
    transform: translateY(-1px);
}

.basics-step-nav-num {
    font-variant-numeric: tabular-nums;
    font-weight: 700;
    color: #2563eb;
    font-size: 0.75rem;
}

/* ---- Steps container ------------------------------------------------------- */

.basics-steps {
    display: flex;
    flex-direction: column;
    gap: 4rem;
    margin-bottom: 4rem;
}

.basics-step {
    scroll-margin-top: 7rem;
}

.basics-step-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    align-items: center;
}

@media (min-width: 900px) {
    .basics-step-grid {
        grid-template-columns: 1fr 1fr;
        gap: 3rem;
    }

    .basics-step--reverse .basics-step-grid > .basics-step-media {
        order: 2;
    }

    .basics-step--reverse .basics-step-grid > .basics-step-body {
        order: 1;
    }
}

.basics-step-media {
    position: relative;
    border-radius: 0.875rem;
    overflow: hidden;
    aspect-ratio: 4 / 3;
    background: #f3f4f6;
    box-shadow: 0 8px 24px -10px rgba(15, 23, 42, 0.2);
}

.basics-step-media img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.6s ease;
}

.basics-step:hover .basics-step-media img {
    transform: scale(1.02);
}

.basics-step-body {
    min-width: 0;
}

.basics-step-tag {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 700;
    color: #2563eb;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin: 0 0 0.5rem;
}

.basics-step-title {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 700;
    color: #0f172a;
    line-height: 1.2;
    margin: 0 0 1rem;
    letter-spacing: -0.01em;
}

.basics-step-lede {
    font-size: 1.0625rem;
    line-height: 1.65;
    color: #1f2937;
    margin: 0 0 0.875rem;
}

.basics-step-body p {
    font-size: 0.95rem;
    line-height: 1.7;
    color: #374151;
    margin: 0 0 0.875rem;
}

.basics-step-body p:last-of-type {
    margin-bottom: 0;
}

/* ---- Callout boxes --------------------------------------------------------- */

.basics-callout {
    margin-top: 1rem;
    padding: 0.875rem 1.125rem;
    background: #eff6ff;
    border-left: 3px solid #2563eb;
    border-radius: 0.375rem;
    font-size: 0.9rem;
    line-height: 1.6;
    color: #1e3a8a;
}

.basics-callout strong {
    color: #1e3a8a;
}

.basics-callout--warning {
    background: #fef3c7;
    border-left-color: #d97706;
    color: #78350f;
}

.basics-callout--warning strong {
    color: #78350f;
}

/* ---- Microscopy technique list -------------------------------------------- */

.basics-techniques {
    list-style: none;
    padding: 0;
    margin: 1rem 0 0;
    display: grid;
    gap: 0.625rem;
}

.basics-techniques li {
    padding: 0.625rem 0.875rem;
    background: #f9fafb;
    border: 1px solid #e5e7eb;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    line-height: 1.5;
    color: #374151;
}

.basics-techniques strong {
    color: #0f172a;
}

/* ---- Inline data tables ---------------------------------------------------- */

.basics-data-table {
    margin: 1.75rem 0 0;
    padding: 0;
}

.basics-data-table figcaption {
    font-size: 0.8125rem;
    font-weight: 600;
    color: #6b7280;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.625rem;
}

.basics-table-scroll {
    overflow-x: auto;
    border: 1px solid #e5e7eb;
    border-radius: 0.625rem;
    background: #fff;
    -webkit-overflow-scrolling: touch;
}

.basics-data-table table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
    min-width: 520px;
}

.basics-data-table thead th {
    background: #f8fafc;
    color: #0f172a;
    text-align: left;
    font-weight: 600;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid #e5e7eb;
    white-space: nowrap;
}

.basics-data-table tbody th {
    text-align: left;
    font-weight: 600;
    color: #111827;
    padding: 0.625rem 1rem;
    background: #fafafa;
    border-bottom: 1px solid #f3f4f6;
}

.basics-data-table tbody td {
    padding: 0.625rem 1rem;
    color: #374151;
    border-bottom: 1px solid #f3f4f6;
    vertical-align: top;
}

.basics-data-table tbody tr:last-child th,
.basics-data-table tbody tr:last-child td {
    border-bottom: none;
}

.basics-data-table tbody tr:hover td,
.basics-data-table tbody tr:hover th {
    background: #f9fafb;
}

/* ---- Related guides (within a step) --------------------------------------- */

.basics-step-related {
    margin-top: 2rem;
}

.basics-related-heading {
    font-size: 0.75rem;
    font-weight: 700;
    color: #6b7280;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin: 0 0 0.75rem;
}

/* The guide-cards-grid default is 1 / 2 / 3 columns. Inside a step,
   2 columns max keeps the row balanced. */
.basics-related-grid {
    grid-template-columns: 1fr;
}

@media (min-width: 700px) {
    .basics-related-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .basics-related-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ---- Author byline -------------------------------------------------------- */

.basics-author {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    align-items: center;
    margin: 4rem 0 3rem;
    padding: 2rem;
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    border: 1px solid #e2e8f0;
    border-radius: 0.875rem;
}

@media (min-width: 700px) {
    .basics-author {
        grid-template-columns: 180px 1fr;
        gap: 2rem;
        padding: 2.5rem;
    }
}

.basics-author-portrait {
    width: 140px;
    height: 140px;
    border-radius: 50%;
    overflow: hidden;
    background: #e5e7eb;
    margin: 0;
    flex-shrink: 0;
    box-shadow: 0 8px 24px -12px rgba(15, 23, 42, 0.3);
}

@media (min-width: 700px) {
    .basics-author-portrait {
        width: 180px;
        height: 180px;
    }
}

.basics-author-portrait img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.basics-author-eyebrow {
    font-size: 0.75rem;
    font-weight: 600;
    color: #2563eb;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin: 0 0 0.375rem;
}

.basics-author-name {
    font-size: 1.5rem;
    font-weight: 700;
    color: #0f172a;
    margin: 0 0 0.875rem;
    line-height: 1.2;
}

.basics-author-body p {
    font-size: 0.9375rem;
    line-height: 1.65;
    color: #374151;
    margin: 0 0 0.75rem;
}

.basics-author-actions {
    margin-top: 1.25rem !important;
}

.basics-author-source {
    font-size: 0.8125rem;
    color: #6b7280;
    margin: 0.875rem 0 0 !important;
    line-height: 1.55;
}

.basics-author-source a {
    color: #2563eb;
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 2px;
}

.basics-author-source a:hover {
    color: #1d4ed8;
}

/* ---- "Keep exploring" footer section (uses .resources-grid) --------------- */

.basics-browse {
    margin: 0 0 3rem;
}

.basics-browse .section-header {
    margin-bottom: 0.5rem;
}

/* Make this grid four-up at desktop instead of the global three-up.
   At tablet, drop to two-up. Cards get tighter padding to fit. */
.basics-browse .resources-grid {
    gap: 1rem;
}

@media (min-width: 640px) {
    .basics-browse .resources-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 960px) {
    .basics-browse .resources-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.basics-browse .resource-card {
    padding: 1.125rem 1.125rem 1.25rem;
}

.basics-browse .resource-icon {
    width: 2.25rem;
    height: 2.25rem;
    margin-bottom: 0.75rem;
    border-radius: 0.4rem;
}

.basics-browse .resource-icon svg {
    width: 1.125rem;
    height: 1.125rem;
}

.basics-browse .resource-card h3 {
    font-size: 1rem;
    margin-bottom: 0.375rem;
}

.basics-browse .resource-card p {
    font-size: 0.8125rem;
    line-height: 1.5;
    margin-bottom: 0;
}

.basics-browse .resource-type-badge {
    font-size: 0.6875rem;
    padding: 0.15rem 0.5rem;
    margin-bottom: 0.5rem;
    align-self: flex-start;
}

/* Step animation entry */
@media (prefers-reduced-motion: no-preference) {
    .basics-step {
        opacity: 0;
        transform: translateY(20px);
        animation: basicsStepIn 0.6s ease-out forwards;
        animation-delay: 0.05s;
    }

    @keyframes basicsStepIn {
        to {
            opacity: 1;
            transform: translateY(0);
        }
    }
}