/* ============================================================
   Trivorix.org — Documentation-style UI
   Mobile-first, clean, technical reference
   ============================================================ */

/* ---- Variables ---- */
:root {
    --color-primary:     #1a5276;
    --color-primary-dark:#154360;
    --color-accent:      #f39c12;
    --color-accent-dark: #d68910;
    --color-bg:          #f4f6f8;
    --color-surface:     #ffffff;
    --color-border:      #dce3ea;
    --color-text:        #2c3e50;
    --color-text-muted:  #6b7c93;
    --color-heading:     #1a2c3d;
    --color-link:        #1a5276;
    --color-link-hover:  #154360;
    --color-tag-bg:      #eaf0f8;
    --color-tag-text:    #1a5276;

    --font-base: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;

    --radius-sm:  4px;
    --radius-md:  8px;
    --radius-lg:  12px;

    --shadow-sm:  0 1px 3px rgba(0,0,0,.08);
    --shadow-md:  0 4px 12px rgba(0,0,0,.1);

    --max-content: 820px;
    --max-wide:    1100px;

    --space-xs:  0.25rem;
    --space-sm:  0.5rem;
    --space-md:  1rem;
    --space-lg:  1.5rem;
    --space-xl:  2rem;
    --space-2xl: 3rem;
}

/* ---- Reset ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; font-size: 16px; -webkit-text-size-adjust: 100%; }

body {
    font-family: var(--font-base);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.7;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main { flex: 1; }

img { max-width: 100%; height: auto; display: block; }

a { color: var(--color-link); text-decoration: underline; text-decoration-color: rgba(26,82,118,.3); text-underline-offset: 3px; }
a:hover { color: var(--color-link-hover); text-decoration-color: var(--color-link-hover); }

ul, ol { padding-left: 1.4em; }

/* ============================================================
   HEADER
   ============================================================ */
.site-header {
    background: var(--color-primary);
    color: #fff;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 8px rgba(0,0,0,.2);
}

.header-inner {
    max-width: var(--max-wide);
    margin: 0 auto;
    padding: var(--space-sm) var(--space-lg);
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    flex-wrap: wrap;
}

.brand-link {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    text-decoration: none;
    color: #fff;
}

.brand-logo svg { flex-shrink: 0; }

.brand-text { display: flex; flex-direction: column; line-height: 1.2; }

.brand-name {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -.02em;
    color: #fff;
}

.brand-tagline {
    font-size: 0.7rem;
    color: rgba(255,255,255,.7);
    font-weight: 400;
}

/* Nav toggle (mobile) */
.nav-toggle {
    display: flex;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-sm);
    margin-left: auto;
    border-radius: var(--radius-sm);
}

.nav-toggle-bar {
    display: block;
    width: 22px;
    height: 2px;
    background: rgba(255,255,255,.85);
    border-radius: 2px;
    transition: transform .2s, opacity .2s;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Nav list */
.site-nav { display: none; width: 100%; }
.site-nav.is-open { display: block; }

.nav-list {
    list-style: none;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 2px;
    padding-bottom: var(--space-sm);
}

.nav-link {
    display: block;
    padding: var(--space-sm) var(--space-md);
    color: rgba(255,255,255,.85);
    text-decoration: none;
    font-size: .9rem;
    border-radius: var(--radius-sm);
    transition: background .15s, color .15s;
}

.nav-link:hover,
.nav-link--active {
    background: rgba(255,255,255,.12);
    color: #fff;
    text-decoration: none;
}

.nav-link--active { font-weight: 600; }

@media (min-width: 900px) {
    .nav-toggle { display: none; }
    .site-nav { display: block; width: auto; margin-left: auto; }
    .nav-list { flex-direction: row; padding-bottom: 0; gap: 4px; }
    .nav-link { padding: var(--space-xs) var(--space-sm); font-size: .85rem; }
}

/* ============================================================
   PAGE LAYOUT
   ============================================================ */
.page-wrap {
    max-width: var(--max-wide);
    margin: 0 auto;
    padding: var(--space-xl) var(--space-lg);
}

.page-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-xl);
}

@media (min-width: 900px) {
    .page-layout {
        grid-template-columns: 220px 1fr;
        align-items: start;
    }
    .page-sidebar { position: sticky; top: 72px; }
}

/* ============================================================
   HERO BANNER (index)
   ============================================================ */
.hero {
    background: linear-gradient(135deg, var(--color-primary) 60%, #2471a3 100%);
    color: #fff;
    padding: var(--space-2xl) var(--space-lg);
}

.hero-inner {
    max-width: var(--max-wide);
    margin: 0 auto;
}

.hero-title {
    font-size: clamp(1.6rem, 4vw, 2.4rem);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: var(--space-md);
}

.hero-title span { color: var(--color-accent); }

.hero-lead {
    font-size: 1.05rem;
    max-width: 600px;
    color: rgba(255,255,255,.85);
    line-height: 1.7;
}

/* ============================================================
   TOPIC CARDS GRID (index)
   ============================================================ */
.topics-section {
    padding: var(--space-2xl) var(--space-lg);
    max-width: var(--max-wide);
    margin: 0 auto;
}

.section-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-heading);
    margin-bottom: var(--space-xl);
    padding-bottom: var(--space-sm);
    border-bottom: 2px solid var(--color-border);
}

.topics-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-lg);
}

@media (min-width: 600px) {
    .topics-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 900px) {
    .topics-grid { grid-template-columns: repeat(3, 1fr); }
}

.topic-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: box-shadow .2s, transform .2s;
    display: flex;
    flex-direction: column;
}

.topic-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }

.topic-card-img {
    width: 100%;
    height: 180px;
    object-fit: cover;
}

.topic-card-body {
    padding: var(--space-lg);
    flex: 1;
    display: flex;
    flex-direction: column;
}

.topic-card-icon { font-size: 1.8rem; margin-bottom: var(--space-sm); }

.topic-card-title {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--color-heading);
    margin-bottom: var(--space-sm);
}

.topic-card-desc {
    font-size: .9rem;
    color: var(--color-text-muted);
    line-height: 1.5;
    flex: 1;
    margin-bottom: var(--space-md);
}

.topic-card-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: .875rem;
    font-weight: 600;
    color: var(--color-primary);
    text-decoration: none;
    padding: var(--space-sm) var(--space-md);
    border: 1.5px solid var(--color-primary);
    border-radius: var(--radius-sm);
    transition: background .15s, color .15s;
    align-self: flex-start;
}

.topic-card-link:hover {
    background: var(--color-primary);
    color: #fff;
    text-decoration: none;
}

/* ============================================================
   BREADCRUMB
   ============================================================ */
.breadcrumb-nav { margin-bottom: var(--space-lg); }

.breadcrumb {
    list-style: none;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-xs);
    font-size: .85rem;
    color: var(--color-text-muted);
}

.breadcrumb-item { display: flex; align-items: center; gap: var(--space-xs); }

.breadcrumb-item a { color: var(--color-link); text-decoration: none; }
.breadcrumb-item a:hover { text-decoration: underline; }

.breadcrumb-sep { color: var(--color-border); }

.breadcrumb-current { color: var(--color-text); font-weight: 500; }

/* ============================================================
   SIDEBAR NAV (page sidebar)
   ============================================================ */
.sidebar-nav {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.sidebar-nav-title {
    background: var(--color-tag-bg);
    color: var(--color-primary);
    font-size: .8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .08em;
    padding: var(--space-sm) var(--space-md);
    border-bottom: 1px solid var(--color-border);
}

.sidebar-nav-list {
    list-style: none;
    padding: var(--space-sm) 0;
    margin: 0;
}

.sidebar-nav-item a {
    display: block;
    padding: var(--space-xs) var(--space-md);
    font-size: .875rem;
    color: var(--color-text);
    text-decoration: none;
    border-left: 3px solid transparent;
    transition: background .12s, border-color .12s, color .12s;
}

.sidebar-nav-item a:hover {
    background: var(--color-tag-bg);
    color: var(--color-primary);
    border-left-color: var(--color-primary);
}

.sidebar-nav-item a.active {
    background: var(--color-tag-bg);
    color: var(--color-primary);
    font-weight: 600;
    border-left-color: var(--color-accent);
}

/* ============================================================
   TOC
   ============================================================ */
.toc-block {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    margin-top: var(--space-md);
    overflow: hidden;
}

.toc-header { padding: 0; }

.toc-toggle {
    display: flex;
    width: 100%;
    align-items: center;
    justify-content: space-between;
    background: var(--color-tag-bg);
    border: none;
    cursor: pointer;
    padding: var(--space-sm) var(--space-md);
    font-size: .8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .08em;
    color: var(--color-primary);
    border-bottom: 1px solid var(--color-border);
}

.toc-arrow { transition: transform .2s; }
.toc-toggle[aria-expanded="false"] .toc-arrow { transform: rotate(-90deg); }

.toc-list-wrap { padding: var(--space-sm) 0; }
.toc-list-wrap.hidden { display: none; }

.toc-list, .toc-sublist {
    list-style: none;
    padding: 0;
    margin: 0;
}

.toc-item { margin: 0; }

.toc-link, .toc-sublink {
    display: block;
    padding: 3px var(--space-md);
    font-size: .85rem;
    color: var(--color-text);
    text-decoration: none;
    transition: color .12s;
}

.toc-link:hover, .toc-sublink:hover { color: var(--color-primary); text-decoration: none; }

.toc-sublist { padding-left: var(--space-md); }
.toc-sublink { font-size: .8rem; color: var(--color-text-muted); padding: 2px var(--space-md); }

/* ============================================================
   ARTICLE CONTENT
   ============================================================ */
.article-header { margin-bottom: var(--space-xl); }

.article-tag {
    display: inline-block;
    background: var(--color-tag-bg);
    color: var(--color-tag-text);
    font-size: .75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .08em;
    padding: 3px 10px;
    border-radius: 20px;
    margin-bottom: var(--space-sm);
}

.article-title {
    font-size: clamp(1.4rem, 3.5vw, 2rem);
    font-weight: 800;
    color: var(--color-heading);
    line-height: 1.25;
    margin-bottom: var(--space-md);
}

.article-lead {
    font-size: 1.05rem;
    color: var(--color-text-muted);
    line-height: 1.7;
    border-left: 3px solid var(--color-accent);
    padding-left: var(--space-md);
}

.article-cover {
    width: 100%;
    height: auto;
    max-height: 360px;
    object-fit: cover;
    border-radius: var(--radius-md);
    margin: var(--space-xl) 0;
    box-shadow: var(--shadow-sm);
}

.article-body h2 {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--color-heading);
    margin: var(--space-2xl) 0 var(--space-md);
    padding-bottom: var(--space-xs);
    border-bottom: 2px solid var(--color-border);
    line-height: 1.3;
}

.article-body h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-heading);
    margin: var(--space-xl) 0 var(--space-sm);
}

.article-body p { margin-bottom: var(--space-md); }

.article-body ul, .article-body ol {
    margin-bottom: var(--space-md);
    padding-left: 1.5em;
}

.article-body li { margin-bottom: var(--space-xs); }

.article-body strong { font-weight: 700; color: var(--color-heading); }

/* Infobox */
.infobox {
    background: var(--color-tag-bg);
    border-left: 4px solid var(--color-primary);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    padding: var(--space-md) var(--space-lg);
    margin: var(--space-lg) 0;
    font-size: .9rem;
}

.infobox.infobox--warning {
    background: #fef9e7;
    border-left-color: var(--color-accent);
}

.infobox-title {
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--space-xs);
    font-size: .85rem;
    text-transform: uppercase;
    letter-spacing: .06em;
}

.infobox--warning .infobox-title { color: var(--color-accent-dark); }

/* Checklist */
.checklist {
    list-style: none;
    padding: 0;
    margin-bottom: var(--space-lg);
}

.checklist li {
    display: flex;
    gap: var(--space-sm);
    align-items: flex-start;
    padding: var(--space-sm) 0;
    border-bottom: 1px solid var(--color-border);
    font-size: .95rem;
}

.checklist li:last-child { border-bottom: none; }

.checklist li::before {
    content: "✓";
    color: var(--color-primary);
    font-weight: 700;
    flex-shrink: 0;
    margin-top: 2px;
}

/* Step list */
.steps-list {
    list-style: none;
    padding: 0;
    counter-reset: steps;
    margin-bottom: var(--space-lg);
}

.steps-list li {
    counter-increment: steps;
    display: flex;
    gap: var(--space-md);
    align-items: flex-start;
    padding: var(--space-md) 0;
    border-bottom: 1px solid var(--color-border);
}

.steps-list li:last-child { border-bottom: none; }

.steps-list li::before {
    content: counter(steps);
    background: var(--color-primary);
    color: #fff;
    width: 26px;
    height: 26px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: .8rem;
    font-weight: 700;
    flex-shrink: 0;
    margin-top: 2px;
}

/* Table */
.data-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: var(--space-lg);
    font-size: .9rem;
    overflow-x: auto;
    display: block;
}

.data-table th {
    background: var(--color-primary);
    color: #fff;
    text-align: left;
    padding: var(--space-sm) var(--space-md);
    font-size: .8rem;
    font-weight: 700;
    white-space: nowrap;
}

.data-table td {
    padding: var(--space-sm) var(--space-md);
    border-bottom: 1px solid var(--color-border);
    vertical-align: top;
}

.data-table tr:last-child td { border-bottom: none; }
.data-table tr:nth-child(even) td { background: var(--color-tag-bg); }

/* Image with caption */
.figure-block { margin: var(--space-xl) 0; }

.figure-block img {
    width: 100%;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.figure-caption {
    font-size: .8rem;
    color: var(--color-text-muted);
    text-align: center;
    margin-top: var(--space-xs);
    padding: 0 var(--space-sm);
}

/* ============================================================
   RELATED BLOCK
   ============================================================ */
.related-block {
    margin-top: var(--space-2xl);
    padding-top: var(--space-xl);
    border-top: 2px solid var(--color-border);
}

.related-title {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--color-heading);
    margin-bottom: var(--space-md);
}

.related-list {
    list-style: none;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.related-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-md);
    background: var(--color-tag-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: .875rem;
    font-weight: 500;
    color: var(--color-primary);
    text-decoration: none;
    transition: background .12s, border-color .12s;
}

.related-link:hover {
    background: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
    text-decoration: none;
}

.related-arrow { font-size: .85em; }

/* ============================================================
   FAQ BLOCK
   ============================================================ */
.faq-block { margin-top: var(--space-2xl); }

.faq-block-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-heading);
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-sm);
    border-bottom: 2px solid var(--color-border);
}

.faq-list { display: flex; flex-direction: column; gap: var(--space-sm); }

.faq-entry {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.faq-toggle {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md) var(--space-lg);
    background: none;
    border: none;
    cursor: pointer;
    font-size: .95rem;
    font-weight: 600;
    color: var(--color-heading);
    text-align: left;
    transition: background .12s;
}

.faq-toggle:hover { background: var(--color-tag-bg); }

.faq-toggle[aria-expanded="true"] { background: var(--color-tag-bg); }

.faq-icon {
    font-size: 1.1rem;
    color: var(--color-primary);
    flex-shrink: 0;
    transition: transform .2s;
    font-weight: 700;
}

.faq-toggle[aria-expanded="true"] .faq-icon { transform: rotate(45deg); }

.faq-answer {
    padding: 0 var(--space-lg) var(--space-md);
    font-size: .9rem;
    color: var(--color-text);
    line-height: 1.7;
    border-top: 1px solid var(--color-border);
}

.faq-answer p { margin-top: var(--space-sm); }

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
    background: var(--color-primary-dark);
    color: rgba(255,255,255,.75);
    margin-top: auto;
    padding: var(--space-2xl) var(--space-lg) var(--space-lg);
}

.footer-inner {
    max-width: var(--max-wide);
    margin: 0 auto;
}

.footer-cols {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-xl);
    margin-bottom: var(--space-xl);
}

@media (min-width: 600px) { .footer-cols { grid-template-columns: 2fr 1fr 1fr; } }

.footer-brand {
    font-size: 1.1rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: var(--space-sm);
}

.footer-desc { font-size: .875rem; line-height: 1.6; }

.footer-col-title {
    font-size: .75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .08em;
    color: rgba(255,255,255,.5);
    margin-bottom: var(--space-sm);
}

.footer-nav-list { list-style: none; padding: 0; display: flex; flex-direction: column; gap: var(--space-xs); }

.footer-nav-list a {
    font-size: .875rem;
    color: rgba(255,255,255,.65);
    text-decoration: none;
}

.footer-nav-list a:hover { color: #fff; text-decoration: underline; }

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,.12);
    padding-top: var(--space-md);
}

.footer-copy { font-size: .8rem; color: rgba(255,255,255,.4); }

/* ============================================================
   UTILITY CLASSES
   ============================================================ */
.visually-hidden {
    position: absolute; width: 1px; height: 1px;
    padding: 0; margin: -1px; overflow: hidden;
    clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

.container {
    max-width: var(--max-content);
    margin: 0 auto;
}

/* Seasonal badge */
.season-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: .8rem;
    font-weight: 700;
    padding: 3px 10px;
    border-radius: 20px;
}

.season-badge--winter { background: #d6eaf8; color: #1a5276; }
.season-badge--summer { background: #fef9e7; color: #d68910; }
.season-badge--all    { background: #e8f8f5; color: #1a7a5e; }