/* boundary-surveying-guide.css — From Trig Pillars to RTK Rovers
   BoundaryFinder UK — /boundary-surveying-guide
*/

/* ── Hero ──────────────────────────────────────────────── */
.bsg-hero {
    background:
        linear-gradient(135deg, rgba(13, 59, 102, 0.22) 0%, rgba(26, 86, 50, 0.22) 100%),
        url('/static/images/sg-hero-bg.jpg') center / cover no-repeat;
    background:
        linear-gradient(135deg, rgba(13, 59, 102, 0.22) 0%, rgba(26, 86, 50, 0.22) 100%),
        url('/static/images/sg-hero-bg.webp') center / cover no-repeat;
    color: #fff;
    padding: var(--spacing-2xl) 0 var(--spacing-xl);
    text-align: center;
}
.bsg-hero h1 { font-size: 2.2rem; color: #fff; margin-bottom: var(--spacing-md); }
.bsg-hero h1 small { display: block; font-size: 1rem; font-weight: 400; opacity: 0.88; margin-top: 0.4rem; }
.bsg-hero__lead {
    font-size: 1.1rem;
    max-width: 720px;
    margin: 0 auto var(--spacing-lg);
    opacity: 0.93;
    line-height: 1.65;
}
.bsg-hero__pills {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
    margin-top: var(--spacing-md);
}
.bsg-hero__pill {
    background: rgba(255,255,255,0.18);
    border: 1px solid rgba(255,255,255,0.35);
    border-radius: 20px;
    padding: 0.3rem 0.9rem;
    font-size: 0.8rem;
    font-weight: 500;
    color: #fff;
}

/* ── Table of contents ─────────────────────────────────── */
.bsg-toc {
    background: #f4f7f5;
    border-left: 4px solid var(--color-primary);
    border-radius: var(--border-radius);
    padding: var(--spacing-md) var(--spacing-lg);
    margin: var(--spacing-xl) 0;
}
.bsg-toc__title {
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.bsg-toc__list {
    list-style: none;
    padding: 0;
    margin: 0;
    columns: 2;
    column-gap: var(--spacing-lg);
}
@media (max-width: 600px) { .bsg-toc__list { columns: 1; } }
.bsg-toc__list li { margin-bottom: 0.4rem; }
.bsg-toc__list a { color: var(--color-secondary); text-decoration: none; font-size: 0.9rem; }
.bsg-toc__list a:hover { text-decoration: underline; }

/* ── Main content wrapper ──────────────────────────────── */
.bsg-content { padding: var(--spacing-sm) 0 var(--spacing-2xl); }
.bsg-content .container { max-width: 900px; }

/* ── Sections ──────────────────────────────────────────── */
.bsg-section {
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid #e8e8e8;
}
.bsg-section--last { border-bottom: none; }
.bsg-section h2 { font-size: 1.65rem; color: var(--color-secondary); margin-bottom: var(--spacing-md); padding-top: 0; }
.bsg-section h3 { font-size: 1.15rem; color: var(--color-primary); margin: var(--spacing-lg) 0 var(--spacing-sm); }
.bsg-section p { color: #333; line-height: 1.75; margin-bottom: var(--spacing-sm); }
.bsg-section ul, .bsg-section ol { padding-left: 1.4rem; margin: var(--spacing-sm) 0 var(--spacing-md); }
.bsg-section li { color: #444; line-height: 1.65; margin-bottom: 0.4rem; }
.bsg-section a { color: var(--color-secondary); }
.bsg-section a:hover { text-decoration: underline; }

/* ── Standard green callout ────────────────────────────── */
.bsg-callout {
    background: #f0f4fa;
    border: 1px solid var(--color-secondary);
    border-left: 4px solid var(--color-secondary);
    border-radius: var(--border-radius);
    padding: var(--spacing-md) var(--spacing-lg);
    margin: var(--spacing-lg) 0;
}
.bsg-callout__title {
    font-weight: 700;
    color: var(--color-secondary);
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}
.bsg-callout p { color: #333; margin: 0; line-height: 1.7; }

/* ── Gold / highlight callout ──────────────────────────── */
.bsg-highlight {
    background: #fff9e6;
    border: 1px solid #e8c84a;
    border-left: 4px solid #e8a838;
    border-radius: var(--border-radius);
    padding: var(--spacing-md) var(--spacing-lg);
    margin: var(--spacing-lg) 0;
}
.bsg-highlight__title {
    font-weight: 700;
    color: #7a5500;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}
.bsg-highlight p { color: #3a3000; margin: 0 0 0.5rem; line-height: 1.7; }
.bsg-highlight p:last-child { margin-bottom: 0; }

/* ── Images ────────────────────────────────────────────── */
.bsg-img-right {
    float: right;
    margin: 0 0 var(--spacing-lg) var(--spacing-lg);
    max-width: 300px;
    width: 100%;
}
.bsg-img-left {
    float: left;
    margin: 0 var(--spacing-lg) var(--spacing-lg) 0;
    max-width: 300px;
    width: 100%;
}
.bsg-img-right img,
.bsg-img-left img {
    width: 300px;
    height: 300px;
    object-fit: cover;
    border-radius: var(--border-radius);
    border: 2px solid #dde8e0;
    display: block;
}
.bsg-img-caption {
    font-size: 0.8rem;
    color: #666;
    margin-top: 0.4rem;
    text-align: center;
    line-height: 1.4;
    font-style: italic;
}
.bsg-img-placeholder {
    width: 300px;
    height: 300px;
    background: #f4f7f5;
    border: 2px dashed #b0ccba;
    border-radius: var(--border-radius);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: #7a9a84;
    font-size: 0.8rem;
    text-align: center;
    padding: 1rem;
    line-height: 1.4;
}
.bsg-img-placeholder svg { margin-bottom: 0.5rem; opacity: 0.5; }
.lb-zoom-hint {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    font-size: 0.75rem;
    color: #666;
    margin-top: 0.3rem;
    justify-content: center;
}
@media (max-width: 640px) {
    .bsg-img-right, .bsg-img-left {
        float: none;
        margin: 0 auto var(--spacing-md);
        max-width: 100%;
    }
    .bsg-img-right img, .bsg-img-left img { width: 100%; height: auto; aspect-ratio: 1 / 1; }
    .bsg-img-placeholder { width: 100%; }
}
.bsg-clearfix::after { content: ''; display: table; clear: both; }

/* ── Introduction section ───────────────────────────────── */
.bsg-intro-section {
    background: #fff;
    border: 1px solid #d8e8dc;
    border-left: 5px solid var(--color-primary);
    border-radius: var(--border-radius);
    padding: var(--spacing-xl) var(--spacing-lg);
    margin: var(--spacing-xl) 0;
}
.bsg-intro-section h2 {
    color: var(--color-primary);
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
}
.bsg-intro-section > p {
    color: #333;
    line-height: 1.75;
    margin-bottom: var(--spacing-md);
}
.bsg-intro-section > p em { color: var(--color-primary); font-style: italic; }
.bsg-intro-section__topics {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}
@media (max-width: 760px) { .bsg-intro-section__topics { grid-template-columns: 1fr; } }
.bsg-intro-section__topic strong {
    display: block;
    color: var(--color-primary);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 0.5rem;
}
.bsg-intro-section__topic ul {
    margin: 0;
    padding-left: 1.2rem;
    color: #444;
    font-size: 0.88rem;
    line-height: 1.8;
}
.bsg-intro-section__aside {
    background: linear-gradient(135deg, #f0f9f2 0%, #e8f5eb 100%);
    border: 1px solid #c5ddc9;
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
}
.bsg-intro-section__aside-title {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.07em;
    color: var(--color-primary);
    margin-bottom: 0.5rem;
}
.bsg-intro-section__aside p {
    font-size: 0.85rem;
    color: #2a4a35;
    line-height: 1.65;
    margin-bottom: 0.75rem;
}
.bsg-intro-section__aside-link {
    display: inline-block;
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--color-primary);
    text-decoration: none;
    border-bottom: 1px solid var(--color-primary);
    padding-bottom: 1px;
}
.bsg-intro-section__aside-link:hover { color: var(--color-secondary); border-bottom-color: var(--color-secondary); }

/* ── GNSS Promo section ─────────────────────────────────── */
.bsg-gnss-promo {
    background: linear-gradient(135deg, #f0f9f2 0%, #e8f5eb 100%);
    border: 2px solid #e8a838;
    border-radius: var(--border-radius-lg, 12px);
    padding: var(--spacing-xl) var(--spacing-lg);
    margin: var(--spacing-xl) 0;
}
.bsg-gnss-promo h2 {
    color: var(--color-primary);
    font-size: 1.6rem;
    margin-bottom: var(--spacing-sm);
}
.bsg-gnss-promo__lead {
    color: #2a4a35;
    line-height: 1.75;
    margin-bottom: var(--spacing-lg);
    font-size: 1rem;
}
.bsg-gnss-promo__grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}
@media (max-width: 760px) { .bsg-gnss-promo__grid { grid-template-columns: 1fr; } }

.bsg-gnss-card {
    background: #fff;
    border-radius: var(--border-radius);
    border: 1px solid #c5ddc9;
    border-top: 4px solid var(--color-primary);
    padding: var(--spacing-lg);
}
.bsg-gnss-card--rtk {
    border-top-color: #e8a838;
    background: #fffdf5;
}
.bsg-gnss-card__icon {
    color: var(--color-primary);
    margin-bottom: 0.6rem;
}
.bsg-gnss-card--rtk .bsg-gnss-card__icon { color: #b87c00; }
.bsg-gnss-card__accuracy {
    font-size: 2rem;
    font-weight: 900;
    color: var(--color-primary);
    line-height: 1;
    margin-bottom: 0.2rem;
}
.bsg-gnss-card--rtk .bsg-gnss-card__accuracy { color: #b87c00; }
.bsg-gnss-card__title {
    font-size: 1.05rem;
    font-weight: 700;
    color: #1a1a2e;
    margin-bottom: 0.75rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid #e8f0e9;
}
.bsg-gnss-card--rtk .bsg-gnss-card__title { border-bottom-color: #f0e4c0; }
.bsg-gnss-card p {
    font-size: 0.87rem;
    color: #444;
    line-height: 1.65;
    margin-bottom: 0.75rem;
}
.bsg-gnss-card__how {
    background: #f4f7f5;
    border-left: 3px solid var(--color-primary);
    padding: 0.6rem 0.8rem;
    font-size: 0.8rem;
    color: #333;
    line-height: 1.55;
    border-radius: 0 4px 4px 0;
}
.bsg-gnss-card--rtk .bsg-gnss-card__how {
    background: #fdf6e8;
    border-left-color: #e8a838;
}
.bsg-gnss-promo__cta-row {
    text-align: center;
    margin: var(--spacing-md) 0 var(--spacing-lg);
}
.bsg-gnss-promo__context {
    background: rgba(255,255,255,0.6);
    border-radius: var(--border-radius);
    border: 1px solid #d0e4d5;
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: 0.88rem;
    color: #2a4a35;
    line-height: 1.7;
}
.bsg-gnss-promo__context strong { color: var(--color-primary); }

/* ── Selling / feature section ─────────────────────────── */
.bsg-feature-section {
    background: linear-gradient(135deg, #f0f9f2 0%, #e8f5eb 100%);
    border: 2px solid #e8a838;
    border-radius: var(--border-radius-lg, 12px);
    padding: var(--spacing-xl) var(--spacing-lg);
    margin: var(--spacing-xl) 0;
}
.bsg-feature-section h2 {
    color: var(--color-primary);
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}
.bsg-feature-section > p {
    color: #2a4a35;
    line-height: 1.7;
    margin-bottom: var(--spacing-lg);
}

/* Three feature tier cards */
.bsg-tier-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}
@media (max-width: 720px) { .bsg-tier-cards { grid-template-columns: 1fr; } }
.bsg-tier-card {
    background: #fff;
    border-radius: var(--border-radius);
    padding: var(--spacing-md) var(--spacing-lg);
    border: 1px solid #dde8e0;
    border-top: 4px solid var(--color-primary);
}
.bsg-tier-card--rtk { border-top-color: #e8a838; }
.bsg-tier-card__badge {
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.07em;
    color: var(--color-primary);
    margin-bottom: 0.4rem;
}
.bsg-tier-card--rtk .bsg-tier-card__badge { color: #7a5500; }
.bsg-tier-card__title { font-size: 1rem; font-weight: 700; color: #1a1a2e; margin-bottom: 0.4rem; }
.bsg-tier-card__accuracy {
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--color-secondary);
    margin-bottom: 0.5rem;
    line-height: 1.1;
}
.bsg-tier-card--rtk .bsg-tier-card__accuracy { color: #7a5500; }
.bsg-tier-card__sub {
    font-size: 0.75rem;
    color: #777;
    margin: -0.25rem 0 0.6rem;
    line-height: 1.4;
    font-style: italic;
}
.bsg-tier-card p { font-size: 0.86rem; color: #555; margin: 0; line-height: 1.55; }

/* Feature bullets */
.bsg-feature-bullets {
    list-style: none;
    padding: 0;
    margin: var(--spacing-md) 0 var(--spacing-lg);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
}
@media (max-width: 640px) { .bsg-feature-bullets { grid-template-columns: 1fr; } }
.bsg-feature-bullets li {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    font-size: 0.9rem;
    color: #2a4a35;
    line-height: 1.5;
}
.bsg-feature-bullets li::before {
    content: "✓";
    color: var(--color-primary);
    font-weight: 700;
    flex-shrink: 0;
    margin-top: 0.05rem;
}
.bsg-feature-cta {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--color-primary);
    color: #fff;
    padding: 0.9rem 2rem;
    border-radius: var(--border-radius);
    font-weight: 700;
    font-size: 1rem;
    text-decoration: none;
    transition: background 0.2s;
    margin-top: var(--spacing-sm);
}
.bsg-feature-cta:hover { background: #2d6235; text-decoration: none; color: #fff; }

/* ── Accuracy table ─────────────────────────────────────── */
.bsg-accuracy-table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--spacing-md) 0;
    font-size: 0.88rem;
}
.bsg-accuracy-table th,
.bsg-accuracy-table td {
    text-align: left;
    padding: 0.5rem 0.75rem;
    border: 1px solid #c3ddb8;
}
.bsg-accuracy-table thead tr { background: #d6eed0; font-weight: 700; }
.bsg-accuracy-table tbody tr:nth-child(even) { background: #f0f7ee; }
.bsg-accuracy-table td:last-child { font-weight: 600; color: var(--color-primary); }

/* ── Constellation grid ─────────────────────────────────── */
.bsg-constellation-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}
@media (max-width: 600px) { .bsg-constellation-grid { grid-template-columns: 1fr; } }
.bsg-constellation-card {
    background: #fff;
    border: 1px solid #dde8e0;
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    border-left: 4px solid var(--color-primary);
}
.bsg-constellation-card--ru { border-left-color: #c0392b; }
.bsg-constellation-card--eu { border-left-color: #2980b9; }
.bsg-constellation-card--cn { border-left-color: #e67e22; }
.bsg-constellation-card__flag { font-size: 1.6rem; margin-bottom: 0.3rem; }
.bsg-constellation-card__name { font-size: 1rem; font-weight: 700; color: #1a1a2e; margin-bottom: 0.2rem; }
.bsg-constellation-card__detail { font-size: 0.82rem; color: #555; line-height: 1.5; }

/* ── Equipment cards ────────────────────────────────────── */
.bsg-equipment-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}
@media (max-width: 720px) { .bsg-equipment-grid { grid-template-columns: 1fr; } }
.bsg-equipment-card {
    background: #fff;
    border: 1px solid #dde8e0;
    border-radius: var(--border-radius);
    padding: var(--spacing-md) var(--spacing-lg);
}
.bsg-equipment-card__tier {
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--color-primary);
    margin-bottom: 0.3rem;
}
.bsg-equipment-card__price {
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--color-secondary);
    margin-bottom: 0.3rem;
}
.bsg-equipment-card__title { font-size: 0.95rem; font-weight: 700; color: #1a1a2e; margin-bottom: 0.4rem; }
.bsg-equipment-card p { font-size: 0.84rem; color: #555; margin: 0; line-height: 1.55; }
.bsg-equipment-card ul { font-size: 0.84rem; color: #444; margin: 0.5rem 0 0; padding-left: 1.2rem; }
.bsg-equipment-card li { margin-bottom: 0.2rem; }

/* ── Breadcrumb ─────────────────────────────────────────── */
.fence-breadcrumb {
    font-size: 0.85rem;
    color: #666;
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: 0.4rem;
    flex-wrap: wrap;
}
.fence-breadcrumb a { color: var(--color-secondary); text-decoration: none; }
.fence-breadcrumb a:hover { text-decoration: underline; }
.fence-breadcrumb__sep { opacity: 0.5; }
.fence-breadcrumb__current { color: #888; }

/* ── Related guides ─────────────────────────────────────── */
.bsg-related {
    background: #f4f7f5;
    padding: var(--spacing-xl) 0;
    margin-top: var(--spacing-xl);
}
.bsg-related__heading {
    font-size: 1.4rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-lg);
    text-align: center;
}
.bsg-related__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}
@media (max-width: 720px) { .bsg-related__grid { grid-template-columns: 1fr; } }
.bsg-related__card {
    background: #fff;
    border: 1px solid #dde8e0;
    border-radius: var(--border-radius);
    padding: var(--spacing-md) var(--spacing-lg);
    text-decoration: none;
    transition: box-shadow 0.2s, border-color 0.2s;
    display: block;
}
.bsg-related__card:hover { box-shadow: 0 4px 16px rgba(0,0,0,0.08); border-color: var(--color-primary); text-decoration: none; }
.bsg-related__card-label { font-size: 0.72rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; color: var(--color-primary); margin-bottom: 0.3rem; }
.bsg-related__card h3 { font-size: 0.95rem; color: #1a1a2e; margin: 0 0 0.3rem; }
.bsg-related__card p { font-size: 0.84rem; color: #555; margin: 0; line-height: 1.5; }

/* ── Footer CTA ─────────────────────────────────────────── */
.bsg-footer-cta {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    color: #fff;
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-lg);
    border-radius: var(--border-radius-lg, 12px);
    margin: var(--spacing-xl) 0;
}
.bsg-footer-cta h2 { color: #fff; font-size: 1.6rem; margin-bottom: 0.5rem; }
.bsg-footer-cta p { color: rgba(255,255,255,0.9); margin-bottom: var(--spacing-lg); font-size: 1rem; line-height: 1.65; }
.bsg-footer-cta__btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: #e8a838;
    color: #1a1a00;
    padding: 0.9rem 2.2rem;
    border-radius: var(--border-radius);
    font-weight: 700;
    font-size: 1rem;
    text-decoration: none;
    transition: background 0.2s, transform 0.15s;
}
.bsg-footer-cta__btn:hover { background: #d49520; color: #1a1a00; text-decoration: none; transform: scale(1.03); }