/*
 * Enhanced CSS styles for 4-TECH website portal
 * Optimized for wide screens, compact tables, mobile TOC, and image grouping
 */

/* ─── CSS Variables ─────────────────────────────────────────────────────────── */
:root {
    --max-content: 1400px;
    --max-content-xl: 1600px;
    --sidebar-width: 280px;
    --gap: 32px;
    --radius: 10px;
    --indent-base: 8px;
    --indent-step: 6px;
    --header-h: 36px;

    --color-text: #1f2937;
    --color-text-muted: #4b5563;
    --color-bg: #f8fafc;
    --color-surface: #ffffff;
    --color-border: #e2e8f0;
    --color-accent: #6366f1;
    --color-accent-dim: #eef2ff;

    --font-base: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
}

/* ─── Base / Portal Prose ───────────────────────────────────────────────────── */
.portal-prose {
    font-family: var(--font-base);
    font-size: 15px;
    line-height: 1.65;
    color: var(--color-text);
    word-wrap: break-word;
}

.portal-prose h1,
.portal-prose h2,
.portal-prose h3,
.portal-prose h4 {
    font-weight: 700;
    line-height: 1.25;
    margin-top: 1.8em;
    margin-bottom: 0.5em;
    scroll-margin-top: 88px;
    color: #111827;
}

.portal-prose h1 {
    font-size: clamp(1.6rem, 2.2vw, 2.25rem);
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 0.4rem;
}
.portal-prose h2 {
    font-size: clamp(1.35rem, 1.8vw, 1.875rem);
}
.portal-prose h3 {
    font-size: clamp(1.15rem, 1.4vw, 1.5rem);
}
.portal-prose h4 {
    font-size: clamp(1.05rem, 1.1vw, 1.25rem);
}

.portal-prose h5,
.portal-prose h6 {
    font-weight: 700;
    line-height: 1.3;
    margin-top: 1.4em;
    margin-bottom: 0.4em;
    scroll-margin-top: 88px;
    color: #334155;
}

.portal-prose h5 {
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.portal-prose h6 {
    font-size: 0.9rem;
    color: #64748b;
}

.portal-prose p {
    margin: 0.15em 0;
}

.portal-prose strong {
    font-weight: 700;
}
.portal-prose em {
    font-style: italic;
}
.portal-prose u {
    text-decoration: underline;
}
.portal-prose s {
    text-decoration: line-through;
}

.portal-prose code {
    font-family: var(--font-mono);
    font-size: 0.85em;
    background: #f1f5f9;
    padding: 0.15em 0.35em;
    border-radius: 4px;
    color: #334155;
}

.portal-prose pre {
    background: #0f172a;
    color: #f8fafc;
    padding: 1rem;
    border-radius: var(--radius);
    overflow-x: auto;
    margin: 1.25em 0;
    font-size: 0.85rem;
    line-height: 1.5;
}

.portal-prose pre code {
    background: transparent;
    color: inherit;
    padding: 0;
    font-size: inherit;
}

.portal-prose blockquote {
    border-left: 3px solid var(--color-accent);
    padding-left: 1rem;
    margin: 1.25em 0;
    color: var(--color-text-muted);
    font-style: italic;
}

.portal-prose ul,
.portal-prose ol {
    padding-left: 1.4em;
    margin: 0.75em 0;
}

.portal-prose li {
    margin: 0.35em 0;
}

.portal-prose li > ul,
.portal-prose li > ol {
    margin: 0.35em 0;
}

.portal-prose a {
    color: var(--color-accent);
    text-decoration: none;
}

.portal-prose a:hover {
    text-decoration: underline;
}

/* ─── Notion-like Block Layout (editor style ported to web) ─────────────────── */

/* Unified padding + relative positioning for the floating indicator line */
.portal-prose > p,
.portal-prose > h1,
.portal-prose > h2,
.portal-prose > h3,
.portal-prose > h4,
.portal-prose > h5,
.portal-prose > h6,
.portal-prose > ul,
.portal-prose > ol,
.portal-prose > blockquote,
.portal-prose > pre {
    position: relative;
    margin: 0 !important;
    border-radius: 0;
    padding-top: 0.5rem;
    padding-bottom: 0.5rem;
    /* 10px gap between indicator line and text */
    padding-left: calc(
        var(--indent-base) + var(--indent, 0) * var(--indent-step) + 10px
    );
    box-sizing: border-box;
}

/* Table wrapper and callout: simpler treatment (overflow / own borders) */
.portal-prose > .table-wrapper,
.portal-prose > .callout {
    position: relative;
    margin: 0 !important;
    border-radius: 0;
    box-sizing: border-box;
}

/* Thin divider between consecutive top-level blocks */
.portal-prose > * + * {
    border-top: 1px solid #eef1f5;
}

/* ── Floating indicator line — moves with indent depth ──────────────────────── */
/* The line sits exactly at the indent boundary, giving a visual "branch" cue    */
.portal-prose > p::before,
.portal-prose > h1::before,
.portal-prose > h2::before,
.portal-prose > h3::before,
.portal-prose > h4::before,
.portal-prose > h5::before,
.portal-prose > h6::before,
.portal-prose > ul::before,
.portal-prose > ol::before,
.portal-prose > blockquote::before,
.portal-prose > pre::before {
    content: "";
    position: absolute;
    left: calc(var(--indent-base) + var(--indent, 0) * var(--indent-step));
    top: 0;
    bottom: 0;
    width: 2px;
    background: #dde3ec;
    border-radius: 1px;
    pointer-events: none;
}

/* Heading indicator: stronger slate accent */
.portal-prose > h1::before {
    background: #475569;
    width: 2.5px;
}
.portal-prose > h2::before,
.portal-prose > h3::before,
.portal-prose > h4::before {
    background: #94a3b8;
}

/* H5/H6 indicator: subtle */
.portal-prose > h5::before,
.portal-prose > h6::before {
    background: #cbd5e1;
}

/* Blockquote: indigo accent indicator, a touch wider */
.portal-prose > blockquote::before {
    background: var(--color-accent);
    width: 3px;
}

/* Heading margins */
.portal-prose > h1,
.portal-prose > h2,
.portal-prose > h3,
.portal-prose > h4,
.portal-prose > h5,
.portal-prose > h6 {
    margin-top: 0 !important;
    margin-bottom: 0 !important;
    scroll-margin-top: calc(var(--header-h) + 16px);
}

/* Remove h1's inherited bottom-border (separator line replaces it) */
.portal-prose > h1 {
    border-bottom: none;
}

.portal-prose > h5,
.portal-prose > h6 {
    border-bottom: none;
}

/* Lists: keep marker gutter on top of indent + gap */
.portal-prose > ul,
.portal-prose > ol {
    padding-left: calc(
        var(--indent-base) + var(--indent, 0) * var(--indent-step) + 1.6em +
            10px
    );
}

/* Table wrapper: card border + accent left edge */
.portal-prose > .table-wrapper {
    border: 1px solid var(--color-border);
    border-left: 2px solid #94a3b8;
    padding: 0;
}

/* Callout: keep its own colored left border from .callout-* classes */
.portal-prose > .callout {
    border-left-width: 3px;
    padding-top: 0.5rem;
    padding-bottom: 0.5rem;
    padding-left: var(--indent-base);
}

/* ─── Indent depth gutter tint (tree depth visual) ──────────────────────────── */
/* Indented blocks get a growing accent wash in the gutter — wider = deeper       */
.portal-prose > [data-indent] {
    background-image: linear-gradient(
        to right,
        rgba(99, 102, 241, 0.05)
            calc(var(--indent-base) + var(--indent, 1) * var(--indent-step)),
        transparent
            calc(
                var(--indent-base) + var(--indent, 1) * var(--indent-step) + 4px
            )
    );
}

/* ─── Images ────────────────────────────────────────────────────────────────── */
.portal-prose img {
    max-width: min(100%, 560px);
    height: auto;
    border-radius: 8px;
    display: block;
    margin: 0.6em auto;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.09);
}

.portal-prose img.lazy-img {
    opacity: 0;
    transition: opacity 0.3s ease;
    background-color: #f1f5f9;
}

.portal-prose img.lazy-img.loaded {
    opacity: 1;
}

/* Group of consecutive images (added via JS) */
.portal-prose .img-group {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: flex-start;
    gap: 0.75rem;
    margin: 0.6em auto;
    max-width: min(100%, 700px);
}

.portal-prose .img-group img {
    flex: 1 1 auto;
    max-width: 100%;
    max-height: 300px;
    width: auto;
    object-fit: contain;
    margin: 0;
    box-shadow: 0 1px 6px rgba(0, 0, 0, 0.08);
    border-radius: 6px;
}

/* ─── Tables (Compact) ──────────────────────────────────────────────────────── */
.table-wrapper {
    overflow-x: auto;
    margin: 1.25em 0;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background: var(--color-surface);
    transition: height 0.18s ease;
    /* JS-driven scale-to-fit: overflow switches to hidden when scaled */
}

.portal-prose table {
    width: 100%;
    min-width: 480px;
    border-collapse: collapse;
    font-size: 0.8125rem; /* 13px */
    line-height: 1.4;
}

.portal-prose thead {
    display: table-header-group;
}

.portal-prose th,
.portal-prose td {
    border: 1px solid var(--color-border);
    padding: 0.06rem 0.565rem;
    text-align: left;
    vertical-align: top;
}

.portal-prose th {
    background: #eef2f7;
    font-weight: 700;
    color: #1e293b;
    white-space: nowrap;
    font-size: 0.8125rem;
}

.portal-prose tr:nth-child(even) {
    background: #fafbfc;
}

.portal-prose tr:hover {
    background: #f1f5f9;
}

/* ─── Callouts ──────────────────────────────────────────────────────────────── */
.callout {
    padding: 0.85rem 1rem;
    border-radius: var(--radius);
    margin: 1.25em 0;
    border-left: 3px solid;
    font-size: 0.95rem;
}

.callout-info {
    background: #eff6ff;
    border-left-color: #3b82f6;
}
.callout-warning {
    background: #fef3c7;
    border-left-color: #f59e0b;
}
.callout-success {
    background: #d1fae5;
    border-left-color: #10b981;
}
.callout-danger {
    background: #fee2e2;
    border-left-color: #ef4444;
}

/* ─── Breadcrumb ────────────────────────────────────────────────────────────── */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 6px;
    font-size: 0.8rem;
    color: #64748b;
    flex-wrap: wrap;
}

.breadcrumb-link {
    color: #64748b;
    text-decoration: none;
}

.breadcrumb-link:hover {
    color: var(--color-accent);
    text-decoration: underline;
}

.breadcrumb-sep {
    color: #94a3b8;
}

.breadcrumb-current {
    color: #334155;
    font-weight: 500;
}

/* ─── Document Meta ─────────────────────────────────────────────────────────── */
.doc-meta {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    margin-top: 6px;
}

.meta-tag {
    font-size: 0.75rem;
    padding: 3px 10px;
    border-radius: 9999px;
    background: #f1f5f9;
    color: #475569;
    font-weight: 500;
}

.type-tag {
    background: #e0e7ff;
    color: #3730a3;
}
.lang-tag {
    background: #dbeafe;
    color: #1e40af;
}

.meta-sep {
    color: #cbd5e1;
}
.meta-date {
    font-size: 0.85rem;
    color: #64748b;
}

/* ─── Layout / Shell ────────────────────────────────────────────────────────── */
.doc-header {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 12px 0 14px;
}

.doc-header-inner {
    max-width: var(--max-content);
    margin: 0 auto;
    padding: 0 var(--gap);
}

.doc-shell {
    display: grid;
    grid-template-columns: var(--sidebar-width) 1fr;
    gap: var(--gap);
    max-width: var(--max-content);
    margin: 32px auto;
    padding: 0 var(--gap);
    align-items: start;
}

/* Very wide screens */
@media (min-width: 1600px) {
    :root {
        --max-content: 1600px;
        --sidebar-width: 300px;
        --gap: 40px;
    }
    .portal-prose {
        font-size: 16px;
    }
}

/* ─── Document Content ──────────────────────────────────────────────────────── */
.doc-content {
    background: var(--color-surface);
    border-radius: var(--radius);
    padding: 36px 40px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
    border: 1px solid var(--color-border);
    min-width: 0; /* prevent grid blowout */
}

/* ─── Table of Contents ─────────────────────────────────────────────────────── */
.doc-toc {
    position: sticky;
    /* clearance = measured header height (set by JS) + breathing room */
    top: calc(var(--header-h) + 12px);
    align-self: start;

    min-width: 0;
}

.toc-sticky {
    background: var(--color-surface);
    border-radius: var(--radius);
    padding: 18px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
    border: 1px solid var(--color-border);
}

.toc-scroll {
    max-height: calc(100vh - var(--header-h) - 90px);
    overflow-y: auto;
    padding-right: 6px;
}

.toc-title {
    font-size: 0.75rem;
    font-weight: 700;
    color: #334155;
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.toc-nav {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.toc-link {
    font-size: 0.8rem;
    color: #475569;
    text-decoration: none;
    padding: 5px 8px;
    border-radius: 6px;
    transition: all 0.15s;
    line-height: 1.35;
    display: block;
}

.toc-link:hover {
    background: #f1f5f9;
    color: #0f172a;
}

.toc-link.is-active {
    background: var(--color-accent);
    color: #fff;
    font-weight: 500;
}

.toc-level-1 {
    padding-left: 6px;
    font-weight: 600;
}
.toc-level-2 {
    padding-left: 16px;
    font-size: 0.78rem;
}
.toc-level-3 {
    padding-left: 26px;
    font-size: 0.78rem;
    color: #64748b;
}

/* Mobile TOC toggle button */
.toc-mobile-toggle {
    display: none;
    width: 100%;
    align-items: center;
    justify-content: space-between;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 10px 14px;
    font-size: 0.9rem;
    font-weight: 600;
    color: #334155;
    cursor: pointer;
}

.toc-mobile-toggle::after {
    content: "▾";
    transition: transform 0.2s;
    font-size: 0.8rem;
}

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

/* ─── Footer ────────────────────────────────────────────────────────────────── */
.doc-footer {
    margin-top: 48px;
    padding: 28px 0;
    border-top: 1px solid var(--color-border);
    background: #f8fafc;
}

.footer-inner {
    max-width: var(--max-content);
    margin: 0 auto;
    padding: 0 var(--gap);
    text-align: center;
}

.footer-meta {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 12px;
    font-size: 0.8rem;
    color: #64748b;
}

.footer-hash code {
    font-family: var(--font-mono);
    font-size: 0.8em;
    background: #e2e8f0;
    padding: 2px 5px;
    border-radius: 4px;
}

.footer-sep {
    color: #cbd5e1;
}
.footer-link {
    color: var(--color-accent);
}
.footer-link:hover {
    text-decoration: underline;
}

.footer-tagline {
    font-size: 0.8rem;
    color: #94a3b8;
    margin-top: 6px;
}

/* ─── Empty / Loading States ────────────────────────────────────────────────── */
.empty-portal {
    max-width: var(--max-content);
    margin: 48px auto;
    padding: 48px var(--gap);
    text-align: center;
    background: var(--color-surface);
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
}

.empty-portal p {
    font-size: 1rem;
    color: #64748b;
    margin: 0;
}

.loading-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 48px var(--gap);
    gap: 14px;
}

.spinner {
    width: 36px;
    height: 36px;
    border: 3px solid #e2e8f0;
    border-top-color: var(--color-accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* ─── Responsive Adjustments ────────────────────────────────────────────────── */

/* Tablet and below: stack sidebar above content */
@media (max-width: 1024px) {
    .doc-shell {
        grid-template-columns: 1fr;
        margin: 24px auto;
    }

    .doc-content {
        padding: 28px 24px;
    }

    .doc-toc {
        position: static;
        max-height: none;
        order: -1; /* TOC moves above content */
    }

    .toc-sticky {
        padding: 14px;
    }
}

/* Mobile: collapsible TOC */
/* ─── Mobile & Tablet (≤ 768px) ─────────────────────────────────────────────── */
@media (max-width: 768px) {
    :root {
        --gap: 16px;
        --sidebar-width: 100%;
        --indent-base: 5px;
        --indent-step: 4px;
    }

    /* Doc header */
    .doc-header {
        padding: 6px 0 6px;
    }
    .doc-header-inner {
        padding: 0 6px;
    }
    .doc-title {
        font-size: 1.3rem;
    }

    /* Content card — edge-to-edge on mobile, minimal horizontal padding */
    .doc-content {
        padding: 8px 0;
        border-radius: 0;
        border-left: none;
        border-right: none;
    }
    /* Small right breathing room on text blocks */
    .portal-prose > p,
    .portal-prose > h1,
    .portal-prose > h2,
    .portal-prose > h3,
    .portal-prose > h4,
    .portal-prose > h5,
    .portal-prose > h6,
    .portal-prose > ul,
    .portal-prose > ol,
    .portal-prose > blockquote,
    .portal-prose > pre {
        padding-right: 8px;
    }

    /* Block indicator gap on mobile */
    .portal-prose > p,
    .portal-prose > h1,
    .portal-prose > h2,
    .portal-prose > h3,
    .portal-prose > h4,
    .portal-prose > h5,
    .portal-prose > h6,
    .portal-prose > ul,
    .portal-prose > ol,
    .portal-prose > blockquote,
    .portal-prose > pre {
        padding-left: calc(
            var(--indent-base) + var(--indent, 0) * var(--indent-step) + 8px
        );
    }
    .portal-prose > ul,
    .portal-prose > ol {
        padding-left: calc(
            var(--indent-base) + var(--indent, 0) * var(--indent-step) + 1.4em +
                8px
        );
    }
    .portal-prose h1 {
        font-size: 1.45rem;
    }
    .portal-prose h2 {
        font-size: 1.25rem;
    }
    .portal-prose h3 {
        font-size: 1.1rem;
    }
    .portal-prose h4 {
        font-size: 1rem;
    }
    .portal-prose h5 {
        font-size: 0.85rem;
    }

    .portal-prose .img-group img {
        max-height: 220px;
    }
    .table-wrapper {
        border-radius: 0;
    }

    /* ── Mobile TOC: sidebar hidden, FAB drawer takes over ── */
    .doc-toc {
        display: none !important;
    }

    .breadcrumb {
        font-size: 0.72rem;
    }
    .doc-meta {
        gap: 5px;
    }
    .meta-tag {
        font-size: 0.68rem;
        padding: 2px 7px;
    }
    .footer-inner {
        padding: 0 16px;
    }
}

/* ─── FAB TOC base (hidden on desktop, shown via doc_enhanced media query) ──── */
.toc-fab-wrap {
    display: none;
}

/* ─── Small phones (≤ 480px) ────────────────────────────────────────────────── */
@media (max-width: 480px) {
    :root {
        --indent-base: 4px;
        --indent-step: 3px;
    }

    .portal-prose {
        font-size: 14px;
        line-height: 1.6;
    }
    .portal-prose h1 {
        font-size: 1.25rem;
    }
    .portal-prose h2 {
        font-size: 1.1rem;
    }
    .portal-prose h3 {
        font-size: 1rem;
    }

    .doc-content {
        padding: 6px 0;
    }
    .doc-title {
        font-size: 1.25rem;
    }

    .portal-prose .img-group {
        gap: 0.4rem;
    }
    .portal-prose .img-group img {
        max-height: 180px;
    }
    .portal-prose table {
        font-size: 0.72rem;
    }
    .portal-prose th,
    .portal-prose td {
        padding: 0.25rem 0.35rem;
    }

    /* Very small: hide desktop TOC title decorations */
    .toc-link {
        font-size: 0.75rem;
        padding: 4px 6px;
    }
    .toc-level-2 {
        padding-left: 12px;
    }
    .toc-level-3 {
        padding-left: 20px;
    }
}

/* ─── Nav hamburger visibility ──────────────────────────────────────────────── */
.nav-toggle {
    display: none;
}

@media (max-width: 640px) {
    .nav-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
        background: none;
        border: 1.5px solid rgba(255, 255, 255, 0.25);
        border-radius: 6px;
        color: #e2e8f0;
        font-size: 1rem;
        cursor: pointer;
        padding: 3px 8px;
        line-height: 1;
        transition: background 0.15s;
    }
    .nav-toggle:hover {
        background: rgba(255, 255, 255, 0.1);
    }
    .nav-toggle[aria-expanded="true"] {
        background: rgba(255, 255, 255, 0.12);
    }

    .site-nav {
        display: none;
        position: absolute;
        top: 100%;
        right: 0;
        background: #0f172a;
        border: 1px solid #1e293b;
        border-top: none;
        border-radius: 0 0 8px 8px;
        flex-direction: column;
        gap: 0;
        min-width: 180px;
        box-shadow: 0 8px 24px rgba(0, 0, 0, 0.45);
        z-index: 200;
        padding: 4px 0;
    }

    .site-nav.nav-open {
        display: flex;
    }

    .site-nav a {
        padding: 9px 16px;
        font-size: 0.82rem;
        border-bottom: 1px solid #1e293b;
        border-bottom-width: 0;
    }
    .site-nav a:last-child {
        border-bottom: none;
    }

    .site-header__inner {
        position: relative;
    }
}