/*
   Puerta Diaz Engineering — Blog & Playbook Styling
   Concept B "Precision Dark" design system extension
*/

:root {
    /* Legacy aliases mapping inline chapter styles to Precision Dark design tokens */
    --color-primary: var(--accent);
    --color-accent: #FBBF24;
    --text-main: var(--text);
    --border-light: var(--line);
    --border-subtle: var(--line-strong);
    --bg-surface-2: var(--surface-2);
}

/* ---------- Blog Hub / Header ---------- */
.blog-hub-header {
    padding: 5rem 0 3rem;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.blog-hub-header h1 {
    margin-bottom: 1.25rem;
}

.blog-hub-header .lead {
    margin: 0 auto;
}

/* ---------- Series Grid & Cards ---------- */
.blog-series-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
    gap: 2rem;
    margin: 3rem 0 6rem;
}

.series-card {
    background: linear-gradient(180deg, var(--surface) 0%, var(--bg-2) 100%);
    border: 1px solid var(--line-strong);
    border-radius: var(--r-lg);
    padding: 2.75rem 2.25rem;
    display: flex;
    flex-direction: column;
    text-decoration: none;
    color: var(--text);
    transition: transform 0.35s var(--ease), border-color 0.35s, box-shadow 0.35s;
    position: relative;
    overflow: hidden;
}

.series-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 80% 0%, var(--accent-glow) 0%, transparent 70%);
    opacity: 0;
    transition: opacity 0.35s ease;
    pointer-events: none;
}

.series-card:hover {
    transform: translateY(-4px);
    border-color: var(--line-accent);
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.45), 0 0 24px var(--accent-glow);
}

.series-card:hover::before {
    opacity: 1;
}

.series-card .chapter-count {
    display: inline-flex;
    align-items: center;
    padding: 0.35rem 0.85rem;
    background: rgba(90, 169, 214, 0.1);
    border: 1px solid rgba(90, 169, 214, 0.25);
    border-radius: 999px;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--accent);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    align-self: flex-start;
    margin-bottom: 1.5rem;
}

.series-card h3 {
    font-size: 1.75rem;
    margin-bottom: 1rem;
    color: var(--text);
    line-height: 1.2;
}

.series-card p {
    color: var(--text-muted);
    font-size: 1rem;
    line-height: 1.65;
    margin-bottom: 2rem;
    flex-grow: 1;
}

.series-card .card-cta {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    color: var(--accent);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    margin-top: auto;
    transition: gap 0.25s var(--ease);
}

.series-card:hover .card-cta {
    gap: 0.9rem;
    color: var(--accent-soft);
}

.series-card.coming-soon {
    opacity: 0.55;
    border-style: dashed;
    cursor: default;
}
.series-card.coming-soon:hover {
    transform: none;
    border-color: var(--line-strong);
    box-shadow: none;
}
.series-card.coming-soon .chapter-count {
    background: rgba(255, 255, 255, 0.04);
    border-color: var(--line);
    color: var(--text-dim);
}

/* ---------- Playbook Listing / Chapter Items ---------- */
.playbook-header {
    padding: 4.5rem 0 2rem;
    text-align: center;
    max-width: 820px;
    margin: 0 auto;
}

.playbook-header h1 {
    font-size: clamp(2.4rem, 4.5vw, 3.8rem);
    margin-bottom: 1.25rem;
}

.playbook-header .lead {
    margin: 0 auto;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    text-decoration: none;
    margin-bottom: 2.5rem;
    transition: color 0.25s, transform 0.25s;
}

.back-link svg {
    transition: transform 0.25s var(--ease);
}

.back-link:hover {
    color: var(--accent);
}

.back-link:hover svg {
    transform: translateX(-3px);
}

.chapter-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin: 3.5rem auto 6rem;
    max-width: 860px;
}

.chapter-item {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--r-md);
    padding: 1.5rem 2rem;
    display: flex;
    align-items: center;
    gap: 1.5rem;
    text-decoration: none;
    transition: transform 0.3s var(--ease), border-color 0.3s, background 0.3s, box-shadow 0.3s;
}

.chapter-item:hover {
    transform: translateX(8px);
    background: var(--surface-2);
    border-color: var(--line-accent);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
}

.chapter-number {
    font-family: var(--font-mono);
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--accent);
    min-width: 48px;
    letter-spacing: 0.05em;
}

.chapter-title {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text);
    flex-grow: 1;
    line-height: 1.4;
    transition: color 0.25s;
}

.chapter-item:hover .chapter-title {
    color: #FFFFFF;
}

.chapter-arrow {
    color: var(--text-dim);
    display: flex;
    align-items: center;
    transition: color 0.25s, transform 0.25s;
}

.chapter-item:hover .chapter-arrow {
    color: var(--accent);
    transform: translateX(4px);
}

/* ---------- Article Pages ---------- */
.article-container {
    max-width: 820px;
    margin: 0 auto;
    padding: 4.5rem 1.5rem 6rem;
}

.article-header {
    margin-bottom: 3rem;
    border-bottom: 1px solid var(--line);
    padding-bottom: 2.5rem;
}

.article-title {
    font-size: clamp(2.3rem, 5vw, 3.6rem);
    margin-top: 0.5rem;
    margin-bottom: 1rem;
    line-height: 1.12;
    color: var(--text);
}

.article-content {
    font-size: 1.12rem;
    line-height: 1.85;
    color: var(--text);
}

.article-content h2 {
    margin-top: 3.5rem;
    margin-bottom: 1.25rem;
    font-size: 1.95rem;
    color: var(--text);
    border-bottom: 1px solid var(--line);
    padding-bottom: 0.75rem;
}

.article-content h3 {
    margin-top: 2.25rem;
    margin-bottom: 0.85rem;
    font-size: 1.35rem;
    color: var(--text);
}

.article-content p {
    font-size: 1.12rem;
    line-height: 1.85;
    margin-bottom: 1.75rem;
    color: #D1D9E0;
}

.article-content p em {
    color: var(--accent-soft);
    font-style: italic;
}

.article-content ul,
.article-content ol {
    margin-bottom: 2rem;
    margin-left: 1.75rem;
    color: #D1D9E0;
}

.article-content li {
    margin-bottom: 0.65rem;
    line-height: 1.75;
}

.article-content strong {
    color: var(--text);
    font-weight: 600;
}

.article-content img {
    width: 100%;
    height: auto;
    border-radius: var(--r-md);
    margin: 2.5rem 0;
    border: 1px solid var(--line-strong);
    background: var(--surface);
    display: block;
    box-shadow: 0 12px 36px rgba(0, 0, 0, 0.4);
}

/* Callout Box / Pro Tip */
.callout,
.article-content .pro-tip,
.article-content div[style*="border-left"] {
    background: rgba(90, 169, 214, 0.08) !important;
    border-left: 3px solid var(--accent) !important;
    border-top: 1px solid rgba(90, 169, 214, 0.2);
    border-right: 1px solid rgba(90, 169, 214, 0.2);
    border-bottom: 1px solid rgba(90, 169, 214, 0.2);
    padding: 1.5rem 1.75rem !important;
    margin: 2.25rem 0 !important;
    border-radius: 0 var(--r-md) var(--r-md) 0 !important;
}

.article-content div[style*="border-left"] p {
    margin: 0 !important;
    color: #E2E8F0 !important;
}

/* Tables inside chapters */
.article-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 2.5rem 0;
    border-radius: var(--r-sm);
    overflow: hidden;
    border: 1px solid var(--line-strong);
    background: var(--surface);
}

.article-content th,
.article-content td {
    padding: 1rem 1.25rem;
    text-align: left;
    border-bottom: 1px solid var(--line);
}

.article-content th {
    background: var(--surface-2);
    color: var(--text);
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 0.95rem;
    letter-spacing: 0.02em;
}

.article-content td {
    color: #CBD5E1;
    font-size: 0.95rem;
}

.article-content tr:last-child td {
    border-bottom: none;
}

.article-content tr:nth-child(even) td {
    background: rgba(255, 255, 255, 0.015);
}

/* Next / Prev Navigation */
.article-nav {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-top: 4.5rem;
    padding-top: 2.5rem;
    border-top: 1px solid var(--line);
}

.nav-btn {
    display: flex;
    flex-direction: column;
    padding: 1.5rem 1.75rem;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--r-md);
    text-decoration: none;
    transition: transform 0.3s var(--ease), border-color 0.3s, background 0.3s;
}

.nav-btn:hover {
    transform: translateY(-3px);
    border-color: var(--line-accent);
    background: var(--surface-2);
}

.nav-btn.prev {
    grid-column: 1;
    text-align: left;
}

.nav-btn.next {
    grid-column: 2;
    text-align: right;
    margin-left: auto;
    width: 100%;
}

.nav-label {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--accent);
    margin-bottom: 0.5rem;
}

.nav-title {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 1.05rem;
    color: var(--text);
    line-height: 1.35;
    transition: color 0.2s;
}

.nav-btn:hover .nav-title {
    color: #FFFFFF;
}

@media (max-width: 768px) {
    .blog-series-grid { grid-template-columns: 1fr; }
    .chapter-item { padding: 1.25rem 1.25rem; }
    .chapter-number { min-width: 40px; font-size: 1.15rem; }
    .chapter-title { font-size: 1.05rem; }
    .article-nav { grid-template-columns: 1fr; }
    .nav-btn.next { text-align: left; }
}

/* ---------- Special Chapter Components ---------- */

/* Golden Rule highlight box */
.golden-rule-box {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.08) 0%, rgba(245, 158, 11, 0.02) 100%);
    border: 1px solid rgba(245, 158, 11, 0.28);
    border-radius: var(--r-md);
    padding: 1.75rem 2rem;
    margin: 2.5rem 0;
}

.golden-rule-box h3 {
    color: #FBBF24 !important;
    margin-top: 0 !important;
    margin-bottom: 0.85rem !important;
    font-size: 1.25rem;
}

.golden-rule-box p {
    margin-bottom: 0.85rem;
    color: #E2E8F0 !important;
}

.golden-rule-box p:last-child {
    margin-bottom: 0;
}

/* Master Advice highlight box */
.master-advice-box {
    background: linear-gradient(135deg, rgba(90, 169, 214, 0.09) 0%, rgba(139, 92, 246, 0.04) 100%);
    border: 1px solid rgba(90, 169, 214, 0.28);
    border-radius: var(--r-md);
    padding: 1.75rem 2rem;
    margin: 2.5rem 0;
}

.master-advice-box h3 {
    color: var(--accent) !important;
    margin-top: 0 !important;
    margin-bottom: 0.85rem !important;
    font-size: 1.25rem;
}

.master-advice-box p {
    color: #E2E8F0 !important;
    margin-bottom: 0.85rem;
}

.master-advice-box p:last-child {
    margin-bottom: 0;
}

/* Warning highlight box */
.warning-box {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.09) 0%, rgba(245, 158, 11, 0.03) 100%);
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: var(--r-md);
    padding: 1.75rem 2rem;
    margin: 2.5rem 0;
}

.warning-box h3 {
    color: #F87171 !important;
    margin-top: 0 !important;
    margin-bottom: 0.85rem !important;
    font-size: 1.25rem;
}

.warning-box p {
    color: #E2E8F0 !important;
    margin-bottom: 0.85rem;
}

.warning-box p:last-child {
    margin-bottom: 0;
}

/* Note callout box */
.note-box {
    background: rgba(168, 85, 247, 0.08);
    border-left: 3px solid #A855F7;
    border-top: 1px solid rgba(168, 85, 247, 0.2);
    border-right: 1px solid rgba(168, 85, 247, 0.2);
    border-bottom: 1px solid rgba(168, 85, 247, 0.2);
    padding: 1.5rem 1.75rem;
    margin: 2.25rem 0;
    border-radius: 0 var(--r-md) var(--r-md) 0;
}

.note-box p {
    margin: 0;
    color: #E2E8F0;
}

/* Wins list with icons */
.wins-list {
    list-style: none !important;
    margin-left: 0 !important;
    padding-left: 0 !important;
}

.wins-list li {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    margin-bottom: 0.85rem;
}

.wins-list li .win-icon {
    flex-shrink: 0;
    font-size: 1.2rem;
    line-height: 1.6;
}

/* Check / Cross result items */
.result-item {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text);
}

.result-icon {
    flex-shrink: 0;
    font-size: 1.3rem;
    line-height: 1.8;
}

.result-icon.success {
    color: #34D399;
}

.result-icon.danger {
    color: #F87171;
}

/* Comparison & Shrinkage Tables */
.comparison-table,
.shrinkage-table {
    width: 100%;
    border-collapse: collapse;
    margin: 2.5rem 0;
    font-size: 0.95rem;
    text-align: left;
    border: 1px solid var(--line-strong);
    background: var(--surface);
    border-radius: var(--r-sm);
    overflow: hidden;
}

.comparison-table th,
.shrinkage-table th {
    padding: 0.95rem 1.15rem;
    background: var(--surface-2);
    color: var(--text);
    font-family: var(--font-display);
    font-weight: 600;
    border-bottom: 1px solid var(--line-strong);
}

.comparison-table td,
.shrinkage-table td {
    padding: 0.95rem 1.15rem;
    border-bottom: 1px solid var(--line);
    color: #CBD5E1;
}

.comparison-table tr:hover td,
.shrinkage-table tr:hover td {
    background: rgba(255, 255, 255, 0.02);
}

.shrinkage-table tr.group-header td {
    background: rgba(90, 169, 214, 0.08);
    font-family: var(--font-display);
    font-weight: 700;
    color: var(--accent);
    border-bottom: 1px solid rgba(90, 169, 214, 0.2);
    padding-top: 1.15rem;
}