/* Guides shared styles */

/* ── GUIDES INDEX (hub) ─────────────────────────────────── */
.page-hero {
    padding: 8rem 0 3rem;
    position: relative;
    overflow: hidden;
}
.page-hero::before {
    content: ''; position: absolute; inset: 0;
    background: radial-gradient(ellipse 60% 40% at 50% 30%, rgba(0,212,170,0.06) 0%, transparent 70%);
    pointer-events: none;
}
.breadcrumb {
    display: flex; align-items: center; gap: 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.72rem; letter-spacing: 0.12em; text-transform: uppercase;
    color: var(--t-4); margin-bottom: 1.75rem;
}
.breadcrumb a { color: var(--t-4); text-decoration: none; transition: color var(--ease-fast); }
.breadcrumb a:hover { color: var(--acc); }
.breadcrumb .sep { color: var(--t-4); font-size: 0.6rem; }

.page-hero h1 {
    font-family: var(--font-heading);
    font-size: clamp(2.4rem, 6vw, 4.5rem);
    font-weight: 700;
    letter-spacing: -0.04em;
    line-height: 1.02;
    margin-bottom: 1.25rem;
    max-width: 900px;
    overflow-wrap: break-word;
}
.page-hero h1 em {
    font-style: normal;
    color: var(--acc);
}
.page-hero .lead {
    color: var(--t-2); font-size: 1.05rem;
    max-width: 620px; line-height: 1.7;
}

.filter-bar {
    padding: 2.5rem 0 2rem;
    display: flex; gap: 0.5rem; flex-wrap: wrap;
    border-bottom: 1px solid var(--line);
}
.filter-btn {
    padding: 0.5rem 1.05rem;
    background: transparent;
    border: 1px solid var(--line);
    border-radius: 100px;
    color: var(--t-3);
    font-family: var(--font-body);
    font-size: 0.8rem;
    cursor: pointer;
    transition: all var(--ease-fast);
}
.filter-btn:hover { color: var(--t-1); border-color: var(--line-2); }
.filter-btn.active {
    background: var(--acc);
    color: #050505;
    border-color: var(--acc);
    font-weight: 500;
}

.guides-layout {
    padding: 3rem 0 6rem;
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: 3rem;
    align-items: start;
}

.guides-list {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.75rem;
}
.guide-row {
    background: var(--bg-3);
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 1.85rem 2rem;
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 1.5rem;
    align-items: center;
    text-decoration: none;
    color: inherit;
    transition: transform var(--ease-fast), border-color var(--ease-fast), background var(--ease-fast);
    position: relative;
    overflow: hidden;
}
.guide-row::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--acc), transparent);
    opacity: 0;
    transition: opacity var(--ease-fast);
}
.guide-row:hover {
    transform: translateY(-3px);
    border-color: var(--acc-line);
    background: var(--bg-4);
}
.guide-row:hover::before { opacity: 1; }

.guide-meta {
    display: flex; align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.7rem;
    flex-wrap: wrap;
}
.guide-cat {
    font-family: var(--font-mono);
    font-size: 0.66rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--acc);
    padding: 0.28rem 0.65rem;
    background: var(--acc-d);
    border: 1px solid var(--acc-line);
    border-radius: 100px;
}
.guide-time {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--t-4);
    letter-spacing: 0.05em;
}
.guide-row h2 {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.3;
    margin-bottom: 0.4rem;
    color: var(--t-1);
    transition: color var(--ease-fast);
}
.guide-row:hover h2 { color: var(--acc); }
.guide-row p {
    font-size: 0.88rem;
    color: var(--t-3);
    line-height: 1.6;
}
.guide-arrow {
    color: var(--t-4);
    font-size: 1rem;
    transition: color var(--ease-fast), transform var(--ease-fast);
}
.guide-row:hover .guide-arrow { color: var(--acc); transform: translateX(4px); }

.sidebar {
    position: sticky;
    top: 88px;
    display: flex; flex-direction: column;
    gap: 1rem;
}
.s-card {
    background: var(--bg-3);
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 1.5rem;
}
.s-card h3 {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    font-weight: 500;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--t-4);
    margin-bottom: 1.1rem;
}
.topic-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
}
.topic-list a {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.05em;
    color: var(--t-3);
    background: rgba(255,255,255,0.02);
    border: 1px solid var(--line);
    padding: 0.35rem 0.75rem;
    border-radius: 100px;
    text-decoration: none;
    transition: all var(--ease-fast);
}
.topic-list a:hover { border-color: var(--acc-line); color: var(--acc); }

.s-cta {
    background: linear-gradient(160deg, rgba(0,212,170,0.08), rgba(0,212,170,0.02));
    border: 1px solid var(--acc-line);
    border-radius: 14px;
    padding: 1.5rem;
}
.s-cta h3 {
    font-family: var(--font-heading);
    font-size: 1.05rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    color: var(--t-1);
    margin-bottom: 0.5rem;
    text-transform: none;
}
.s-cta p {
    font-size: 0.85rem;
    color: var(--t-2);
    line-height: 1.6;
    margin-bottom: 1.15rem;
}
.s-cta .btn { width: 100%; justify-content: center; }

/* ── GUIDE ARTICLE PAGE ────────────────────────────────── */
.guide-article-layout {
    max-width: var(--max);
    margin: 0 auto;
    padding: 8rem var(--gutter) 5rem;
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: 4rem;
    align-items: start;
}

.article-head { margin-bottom: 2.5rem; }
.article-head .tag {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.66rem;
    font-weight: 500;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--acc);
    background: var(--acc-d);
    border: 1px solid var(--acc-line);
    padding: 0.3rem 0.75rem;
    border-radius: 100px;
    margin-bottom: 1.5rem;
}
.article-head h1 {
    font-family: var(--font-heading);
    font-size: clamp(2rem, 4vw, 3.2rem);
    font-weight: 700;
    letter-spacing: -0.035em;
    line-height: 1.08;
    margin-bottom: 1.5rem;
    overflow-wrap: break-word;
}
.article-meta {
    display: flex; align-items: center;
    gap: 1.5rem;
    flex-wrap: wrap;
    padding: 1.1rem 0;
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    margin-top: 1rem;
}
.meta-item {
    display: flex; align-items: center;
    gap: 0.45rem;
    font-family: var(--font-mono);
    font-size: 0.74rem;
    letter-spacing: 0.03em;
    color: var(--t-3);
}
.meta-item i { color: var(--acc); font-size: 0.72rem; }

.article-body {
    color: var(--t-2);
    font-size: 0.98rem;
    line-height: 1.85;
}
.article-body h2 {
    font-family: var(--font-heading);
    font-size: 1.65rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    line-height: 1.15;
    color: var(--t-1);
    margin: 3rem 0 1rem;
}
.article-body h3 {
    font-family: var(--font-heading);
    font-size: 1.15rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    color: var(--acc);
    margin: 2rem 0 0.75rem;
}
.article-body p { color: var(--t-2); margin-bottom: 1.15rem; }
.article-body ul, .article-body ol {
    color: var(--t-2);
    margin: 0 0 1.25rem 1.4rem;
}
.article-body li { margin-bottom: 0.5rem; }
.article-body strong { color: var(--t-1); font-weight: 500; }
.article-body a { color: var(--acc); text-decoration: none; border-bottom: 1px solid var(--acc-line); transition: border-color var(--ease-fast); }
.article-body a:hover { border-bottom-color: var(--acc); }
.article-body blockquote {
    border-left: 2px solid var(--acc);
    background: var(--bg-3);
    padding: 1.25rem 1.5rem;
    margin: 1.5rem 0;
    border-radius: 0 8px 8px 0;
    color: var(--t-2);
    font-size: 0.95rem;
}

/* callouts */
.callout {
    border-radius: 12px;
    padding: 1.15rem 1.35rem;
    margin: 1.75rem 0;
    display: flex;
    gap: 0.9rem;
    align-items: flex-start;
}
.callout-icon { font-size: 1rem; flex-shrink: 0; margin-top: 0.15rem; }
.callout p { margin: 0; font-size: 0.9rem; line-height: 1.7; color: var(--t-2); }
.callout strong {
    display: block;
    margin-bottom: 0.35rem;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--t-1);
}
.callout-tip { background: rgba(0,212,170,0.06); border: 1px solid rgba(0,212,170,0.2); }
.callout-tip .callout-icon { color: var(--acc); }
.callout-warn { background: rgba(245,158,11,0.06); border: 1px solid rgba(245,158,11,0.25); }
.callout-warn .callout-icon { color: #f59e0b; }
.callout-danger { background: rgba(239,68,68,0.06); border: 1px solid rgba(239,68,68,0.22); }
.callout-danger .callout-icon { color: #ef4444; }

/* numbered steps */
.steps {
    display: flex; flex-direction: column;
    gap: 1px;
    background: var(--line);
    border-radius: 12px;
    overflow: hidden;
    margin: 1.75rem 0;
    border: 1px solid var(--line);
}
.step {
    background: var(--bg-3);
    padding: 1.3rem 1.65rem;
    display: grid;
    grid-template-columns: 2.5rem 1fr;
    gap: 1.1rem;
    align-items: start;
}
.step-num {
    width: 2.5rem; height: 2.5rem;
    background: var(--acc-d);
    border: 1px solid var(--acc-line);
    border-radius: 10px;
    display: flex; align-items: center; justify-content: center;
    font-family: var(--font-heading);
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--acc);
    flex-shrink: 0;
}
.step h4 {
    font-family: var(--font-heading);
    font-size: 0.98rem;
    font-weight: 600;
    letter-spacing: -0.005em;
    margin-bottom: 0.4rem;
    color: var(--t-1);
}
.step p { color: var(--t-3); font-size: 0.88rem; line-height: 1.65; margin: 0; }

/* case study block */
.case-study {
    background: linear-gradient(160deg, rgba(0,212,170,0.06), rgba(0,212,170,0.02));
    border: 1px solid var(--acc-line);
    border-radius: 12px;
    padding: 1.75rem 2rem;
    margin: 2rem 0;
}
.case-study-label {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    font-weight: 500;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--acc);
    margin-bottom: 0.75rem;
}
.case-study h3 {
    font-family: var(--font-heading);
    font-size: 1.15rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 0.6rem;
    color: var(--t-1);
}
.case-study p { color: var(--t-2); font-size: 0.9rem; line-height: 1.75; margin: 0; }

/* inline CTA */
.inline-cta {
    background: var(--bg-3);
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 1.75rem 2rem;
    margin: 2.5rem 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1.5rem;
}
.inline-cta h3 {
    font-family: var(--font-heading);
    font-size: 1.05rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    margin-bottom: 0.3rem;
    color: var(--t-1);
}
.inline-cta p { color: var(--t-3); font-size: 0.85rem; line-height: 1.6; margin: 0; }

/* author bio */
.author-bio {
    background: var(--bg-3);
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 1.75rem 2rem;
    margin-top: 3rem;
    display: flex;
    gap: 1.25rem;
    align-items: flex-start;
}
.author-avatar {
    width: 52px; height: 52px;
    background: var(--acc-d);
    border: 1px solid var(--acc-line);
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.05rem;
    color: var(--acc);
    flex-shrink: 0;
}
.author-bio h4 {
    font-family: var(--font-heading);
    font-size: 0.95rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    margin-bottom: 0.2rem;
    color: var(--t-1);
}
.author-bio .role {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--acc);
    margin-bottom: 0.55rem;
}
.author-bio p { font-size: 0.85rem; color: var(--t-2); line-height: 1.7; margin: 0; }

/* article sidebar TOC */
.article-sidebar {
    position: sticky;
    top: 88px;
    display: flex; flex-direction: column;
    gap: 1rem;
}
.toc-list {
    list-style: none;
    display: flex; flex-direction: column;
    gap: 0.1rem;
}
.toc-list a {
    color: var(--t-3);
    text-decoration: none;
    font-size: 0.85rem;
    padding: 0.55rem 0.75rem;
    border-radius: 8px;
    display: block;
    border-left: 2px solid transparent;
    transition: all var(--ease-fast);
    line-height: 1.4;
}
.toc-list a:hover, .toc-list a.active {
    color: var(--acc);
    border-left-color: var(--acc);
    background: var(--acc-d);
}

/* related guides list */
.related-list { list-style: none; display: flex; flex-direction: column; gap: 0.15rem; }
.related-list a {
    color: var(--t-2);
    text-decoration: none;
    font-size: 0.85rem;
    padding: 0.5rem 0.75rem;
    border-radius: 8px;
    display: block;
    transition: all var(--ease-fast);
}
.related-list a:hover { color: var(--acc); background: var(--bg-4); }

/* ── MOBILE ────────────────────────────────────────────── */
@media (max-width: 900px) {
    .guides-layout, .guide-article-layout {
        grid-template-columns: 1fr;
        gap: 2.5rem;
        padding-top: 6rem;
    }
    .sidebar, .article-sidebar {
        position: static;
    }
    .page-hero { padding: 6rem 0 2rem; }
    .page-hero .lead { font-size: 0.95rem; }
    .filter-bar { padding: 2rem 0 1.5rem; gap: 0.4rem; }
    .filter-btn { font-size: 0.75rem; padding: 0.4rem 0.9rem; }
    .guide-row { padding: 1.5rem 1.4rem; gap: 1rem; }
    .guide-row h2 { font-size: 1.05rem; }
    .article-head h1 { font-size: clamp(1.75rem, 6vw, 2.6rem); }
    .article-body h2 { font-size: 1.35rem; margin-top: 2.25rem; }
    .article-body h3 { font-size: 1.05rem; }
    .article-body { font-size: 0.92rem; }
    .article-meta { gap: 1rem; }
    .meta-item { font-size: 0.7rem; }
    .inline-cta { flex-direction: column; align-items: flex-start; padding: 1.5rem; }
    .inline-cta .btn { width: 100%; justify-content: center; }
    .step { padding: 1.1rem 1.25rem; grid-template-columns: 2.25rem 1fr; gap: 0.9rem; }
    .step-num { width: 2.25rem; height: 2.25rem; }
    .case-study { padding: 1.35rem 1.5rem; }
    .author-bio { padding: 1.5rem; }
    .callout { padding: 1rem 1.15rem; }
}
@media (max-width: 640px) {
    .guides-layout, .guide-article-layout { padding-top: 5rem; padding-bottom: 3rem; }
    .page-hero { padding: 5rem 0 1.5rem; }
    .article-body { font-size: 0.9rem; line-height: 1.75; }
}