/**
 * Course / Codex — reader’s guide: long-form readability + Nirmana tokens
 */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

.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;
}

/* WCAG 2.1 level AAA: normal text contrast ≥7:1 on void/sidebar/card (#0a0506–#150f11); non-text focus visible (2.4.11); touch target ≥24×24 CSS px (2.5.8). */
.skip-link {
    position: absolute;
    left: 0.5rem;
    top: 0.5rem;
    z-index: 3000;
    padding: 0.6rem 1rem;
    font-family: var(--nir-mono);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    text-decoration: none;
    color: #0a0506;
    background: #f5e6b8;
    border: 2px solid #0a0506;
    border-radius: 2px;
    transform: translateY(-200%);
    transition: transform var(--transition-fast);
}

.skip-link:focus,
.skip-link:focus-visible {
    transform: translateY(0);
    outline: 3px solid #f5d88a;
    outline-offset: 2px;
}

:root {
    --course-text: #e8e4dc;
    --course-body: var(--course-text);
    --course-text-secondary: #d4ccc0;
    --course-body-dim: var(--course-text-secondary);
    --course-ink: #f5f0e8;
    --course-text-muted: #b8aea2;
    --course-text-ui: #c4bbb0;
    /* ≥7:1 on #120a0c (search field) */
    --course-placeholder: #b0a69a;
    /* Links: ≥7:1 on void */
    --course-link: #e0a296;
    --course-link-hover: #f0d4c4;
    --course-focus-ring: #f5d88a;
    --course-code: #e8d4b8;
    --course-lens: #d4c4a8;
    --course-accent: #e0a296;

    --course-bg-elev: var(--nir-void-elev);
    --course-bg-card: color-mix(in srgb, var(--nir-void-elev) 82%, #1e1012);
    --course-border: var(--nir-rail);
    --course-border-strong: var(--nir-crimson-line);

    --course-measure: 42rem;
    /* ≥12px (0.75rem) at 16px root: comfortable body + list spacing (1.4.8) */
    --course-body-size: clamp(1.0625rem, 0.12vw + 1.01rem, 1.125rem);
    --course-line: 1.8;
    --course-line-tight: 1.45;
    /* UI / mono: minimum 12px (1.4.12) */
    --course-ui-size: 0.75rem;

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2.25rem;
    --spacing-xl: 3rem;

    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

html {
    scroll-behavior: smooth;
    font-size: 100%;
    color-scheme: dark;
}

:where(
    a,
    button,
    input,
    select,
    textarea,
    [role="button"],
    [tabindex]:not([tabindex="-1"])
):focus-visible {
    outline: 2px solid var(--course-focus-ring);
    outline-offset: 3px;
}

:where(
    a,
    button,
    input
):focus:not(:focus-visible) {
    outline: none;
}

@media (min-width: 80rem) {
    html {
        font-size: 106%;
    }
}

body {
    font-family: var(--nir-serif);
    color: var(--course-body);
    line-height: var(--course-line);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

/* ----- Reading shell (wide: TOC + column; narrow: overlay TOC) ----- */
.reading-frame {
    min-height: 100dvh;
}

@media (min-width: 1000px) {
    .reading-frame {
        display: grid;
        grid-template-columns: min(17.5rem, 30vw) minmax(0, 1fr);
        align-items: start;
    }
}

.reading-column {
    padding: var(--nir-pad-y) var(--nir-pad-x);
    padding-bottom: max(2.5rem, env(safe-area-inset-bottom, 0));
    min-width: 0;
}

/* ----- Typographic scale: serif body, mono for UI & labels only ----- */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: var(--course-line-tight);
    margin-bottom: var(--spacing-md);
    color: var(--course-ink);
    font-family: var(--nir-serif);
    font-variation-settings: normal;
    letter-spacing: 0.01em;
    scroll-margin-top: 1.5rem;
}

h1 { font-size: 2.1rem; }
h2 { font-size: 1.55rem; margin-top: 2.5rem; }
h3 { font-size: 1.22rem; margin-top: 1.75rem; font-weight: 600; }
h4 { font-size: 1.08rem; }
h5, h6 { font-size: 1rem; }

p {
    margin-bottom: 1.1em;
    color: var(--course-body);
    font-size: var(--course-body-size);
    line-height: var(--course-line);
    max-width: 100%;
}

#content p {
    text-align: start;
    hyphens: manual;
    overflow-wrap: break-word;
}

em {
    color: var(--course-text-secondary);
    font-style: italic;
}

strong {
    color: var(--course-ink);
    font-weight: 600;
}

a {
    color: var(--course-link);
    text-decoration: underline;
    text-decoration-color: color-mix(in srgb, var(--course-link) 55%, transparent);
    text-underline-offset: 0.18em;
    border-bottom: none;
    transition: color var(--transition-fast), text-decoration-color var(--transition-fast);
}

a:hover {
    color: var(--course-link-hover);
    text-decoration-color: color-mix(in srgb, var(--course-link-hover) 75%, #fff 15%);
}

/* ----- Header ----- */
.nir-back {
    margin-bottom: 1.5rem;
}

/* Supersede nirmana-system: higher-contrast + AAA-friendly rail link */
body a.nir-back {
    color: var(--course-text-secondary);
    border-bottom-color: color-mix(in srgb, var(--course-text-ui) 60%, var(--nir-void) 40%);
}

body a.nir-back:hover,
body a.nir-back:focus-visible {
    color: var(--course-text);
    border-bottom-color: var(--course-text-ui);
}

.header {
    text-align: center;
    padding: 0.5rem 0 var(--spacing-lg);
    border-bottom: 1px solid var(--course-border);
    margin-bottom: var(--spacing-md);
    position: relative;
    max-width: 44rem;
    margin-left: auto;
    margin-right: auto;
}

.menu-toggle {
    position: absolute;
    top: 0;
    left: 0;
    min-width: 2.75rem;
    min-height: 2.75rem;
    background: transparent;
    border: 1px solid var(--course-border);
    color: var(--course-text-ui);
    font-size: var(--course-ui-size);
    line-height: 1;
    padding: 0.5rem 0.6rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    font-weight: 500;
    cursor: pointer;
    border-radius: 2px;
    transition:
        color var(--transition-fast),
        border-color var(--transition-fast),
        background var(--transition-fast);
    z-index: 100;
    font-family: var(--nir-mono);
}

@media (min-width: 1000px) {
    .menu-toggle {
        display: none;
    }
}

.menu-toggle:hover {
    color: var(--course-text);
    border-color: var(--nir-rail-hover);
    background: color-mix(in srgb, var(--nir-void-elev) 50%, transparent);
}

.section-kicker {
    font-family: var(--nir-mono);
    font-size: var(--course-ui-size);
    font-weight: 500;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--course-text-ui);
    margin-bottom: 0.5rem;
}

.main-title {
    font-size: clamp(1.75rem, 3.2vw, 2.4rem);
    font-weight: 600;
    letter-spacing: 0.015em;
    margin-bottom: var(--spacing-sm);
    color: var(--course-ink);
    font-family: var(--nir-serif);
    line-height: 1.2;
}

.subtitle {
    font-size: 1.15rem;
    color: var(--course-body);
    margin-bottom: 1.15rem;
    font-family: var(--nir-serif);
    font-weight: 500;
}

.reading-strap {
    max-width: 38ch;
    margin: 0 auto 1.15rem;
    font-size: 1.04rem;
    line-height: 1.7;
    color: var(--course-body);
    text-align: center;
    font-style: normal;
}

.reading-strap em {
    color: var(--course-ink);
    font-style: italic;
}

/* Hand-drawn line under strapline — from course/Library.html */
.lib-scribble {
    display: block;
    width: min(5.5rem, 40vw);
    height: 0.5rem;
    margin: 0.35rem auto 0.6rem;
    color: var(--course-ink);
}

.lib-scribble path {
    fill: none;
    stroke: currentColor;
    stroke-width: 1.4;
    stroke-linecap: round;
    opacity: 0.72;
}

#headerTagline.tagline {
    max-width: 40rem;
    margin: 0 auto;
    font-size: 0.98rem;
    line-height: 1.75;
    color: var(--course-text-secondary);
}

/* Toolbar + filters — adapted from course/Library.html (sheet toolbar) */
.doc-toolbar {
    max-width: var(--course-measure);
    margin: 0 auto 1.25rem;
    padding: 0.75rem 0;
    border-top: 1px solid var(--course-border);
    border-bottom: 1px solid var(--course-border);
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem 1.25rem;
}

.filter-group {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 1.25rem;
    font-family: var(--nir-mono);
    font-size: var(--course-ui-size);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.filter-opt {
    cursor: pointer;
    position: relative;
    min-height: 2.75rem;
    min-width: 2.75rem;
    color: var(--course-text-ui);
    background: none;
    border: none;
    font: inherit;
    padding: 0.35rem 0.2rem;
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: color var(--transition-fast), border-color var(--transition-fast);
}

.filter-opt:hover {
    color: var(--course-text);
}

.filter-opt.active {
    color: var(--course-ink);
}

.filter-opt.active::after {
    content: "";
    position: absolute;
    bottom: -0.1rem;
    left: 0;
    width: 100%;
    height: 1px;
    background: var(--course-ink);
    opacity: 0.85;
}

.lib-shelf-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 2.75rem;
    font-family: var(--nir-mono);
    font-size: var(--course-ui-size);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--course-text-muted);
    text-decoration: none;
    border: 1px solid var(--course-border);
    border-radius: 2px;
    padding: 0.45rem 0.7rem;
    transition: color var(--transition-fast), border-color var(--transition-fast);
}

.lib-shelf-link:hover {
    color: var(--course-text);
    border-color: var(--nir-rail-hover);
}

#headerTagline em {
    color: var(--course-text-secondary);
}

/* Resume */
.resume-row {
    text-align: center;
    margin: 0 auto var(--spacing-md);
    max-width: var(--course-measure);
}

.resume-reading {
    font-family: var(--nir-mono);
    font-size: var(--course-ui-size);
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--course-text-ui);
    background: color-mix(in srgb, var(--course-bg-elev) 70%, transparent);
    border: 1px solid var(--course-border);
    border-radius: 2px;
    min-height: 2.75rem;
    padding: 0.55rem 1rem;
    cursor: pointer;
    transition: color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
}

.resume-reading:hover {
    color: var(--course-text);
    border-color: var(--nir-rail-hover);
    background: color-mix(in srgb, var(--course-bg-elev) 90%, transparent);
}

/* ----- Progress ----- */
.progress-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: color-mix(in srgb, var(--nir-void-deep) 80%, #000);
    z-index: 1000;
    pointer-events: none;
}

.progress-bar {
    height: 100%;
    width: 0%;
    background: linear-gradient(
        90deg,
        color-mix(in srgb, var(--course-accent) 60%, #3a2018),
        var(--course-accent)
    );
    transition: width var(--transition-fast);
    opacity: 0.9;
}

/* ----- Sidebar ----- */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: min(20rem, 90vw);
    max-width: 100%;
    height: 100dvh;
    background: #0a0708;
    border-right: 1px solid var(--course-border);
    overflow-y: auto;
    transition: transform var(--transition-normal);
    z-index: 1001;
    transform: translateX(-102%);
    box-shadow: 8px 0 32px rgba(0, 0, 0, 0.45);
    -webkit-overflow-scrolling: touch;
}

@media (min-width: 1000px) {
    .sidebar {
        position: sticky;
        top: 0;
        left: auto;
        height: 100dvh;
        min-height: 100dvh;
        width: 100%;
        max-width: none;
        transform: none;
        box-shadow: none;
        transition: none;
    }

    .sidebar-backdrop {
        display: none !important;
    }
}

.sidebar.active {
    transform: translateX(0);
}

@media (min-width: 1000px) {
    .sidebar.active {
        transform: none;
    }
}

.sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.1rem 1rem;
    border-bottom: 1px solid var(--course-border);
    position: sticky;
    top: 0;
    background: #0a0708;
    z-index: 10;
}

.sidebar-title {
    font-family: var(--nir-mono);
    font-size: var(--course-ui-size);
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--course-text-ui);
    margin: 0;
    line-height: 1.35;
}

.close-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 2.75rem;
    min-height: 2.75rem;
    background: none;
    border: none;
    color: var(--course-text-ui);
    font-size: 1.5rem;
    line-height: 1;
    cursor: pointer;
    transition: color var(--transition-fast);
    padding: 0.15rem 0.4rem;
    border-radius: 2px;
}

.close-btn:hover {
    color: var(--course-text);
}

@media (min-width: 1000px) {
    .close-btn {
        display: none;
    }
}

/* Detail label + stamp — from course/Library.html (summary / badge) */
.lib-detail-label {
    font-family: var(--nir-mono);
    font-size: var(--course-ui-size);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--course-text-ui);
    border-bottom: 1px solid var(--course-border);
    padding-bottom: 0.35rem;
    margin-bottom: 0.4rem;
    display: block;
}

.lib-stamp {
    width: 5.25rem;
    min-height: 2.35rem;
    border: 1px solid var(--course-border);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--nir-mono);
    font-size: 0.62rem;
    line-height: 1.3;
    text-transform: uppercase;
    text-align: center;
    letter-spacing: 0.05em;
    color: var(--course-text-muted);
    transform: rotate(-9deg);
    margin: 0.2rem 0 0.85rem 0.2rem;
    padding: 0.35rem 0.4rem;
    flex-shrink: 0;
}

.sidebar-hint {
    font-family: var(--nir-serif);
    font-size: 0.95rem;
    line-height: 1.5;
    color: var(--course-text-secondary);
    margin-bottom: 0.9rem;
}

.sidebar-hint .lib-inline-link {
    color: var(--course-link);
    text-decoration: underline;
    text-underline-offset: 0.15em;
    border: none;
    font-size: inherit;
}

.sidebar-hint .lib-inline-link:hover {
    color: var(--course-link-hover);
}

.sidebar-content {
    padding: 0.9rem 1rem 1.4rem;
}

.search-box {
    margin-bottom: 0.9rem;
    padding-bottom: 0.9rem;
    border-bottom: 1px solid var(--course-border);
}

.search-box input {
    width: 100%;
    min-height: 2.75rem;
    padding: 0.55rem 0.7rem;
    background: #120a0c;
    border: 1px solid var(--course-border);
    border-radius: 2px;
    color: var(--course-text);
    font-family: var(--nir-mono);
    font-size: 0.875rem;
    line-height: 1.4;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.search-box input::placeholder {
    color: var(--course-placeholder);
    opacity: 1;
}

.search-box input:focus {
    border-color: var(--nir-rail-hover);
    box-shadow: 0 0 0 1px color-mix(in srgb, var(--course-focus-ring) 45%, var(--nir-void) 55%);
}

.nav-list {
    list-style: none;
}

/* Catalog rows — course/Library.html product-row → outline entries */
.nav-list--library {
    border-top: 1px solid var(--course-border);
    margin-top: 0.1rem;
}

.nav-list--library li {
    margin: 0;
    border-bottom: 1px solid color-mix(in srgb, var(--course-border) 65%, transparent);
}

.nav-list--library a {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 0.5rem;
    min-height: 2.75rem;
    padding: 0.5rem 0.4rem 0.55rem 0.35rem;
    color: var(--course-text-muted);
    border-left: 2px solid transparent;
    text-decoration: none;
    border-bottom: 0;
    transition: color var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast);
    text-align: start;
}

.nav-list--library .nav-title {
    font-family: var(--nir-serif);
    font-size: 0.86rem;
    line-height: 1.3;
    letter-spacing: 0.01em;
    font-weight: 500;
    flex: 1;
    min-width: 0;
}

.nav-list--library .nav-kind {
    flex-shrink: 0;
    font-family: var(--nir-mono);
    font-size: var(--course-ui-size);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    line-height: 1.2;
    margin-top: 0.1rem;
    border: 1px solid var(--course-border);
    color: var(--course-text-ui);
    border-radius: 999px;
    padding: 0.15rem 0.4rem 0.12rem;
    align-self: flex-start;
}

.nav-list--library li.nav-item--h2 {
    background: color-mix(in srgb, #0d0809 100%, transparent);
}

.nav-list--library li.nav-item--h2 .nav-title {
    font-size: 0.8rem;
    font-weight: 400;
    padding-left: 0.35rem;
    color: var(--course-text-ui);
}

.nav-list--library li.nav-item--h2 a {
    padding-left: 0.6rem;
}

.nav-list--library li.nav-item--phase .nav-title {
    font-style: normal;
    color: var(--course-text-secondary);
}

.nav-list a:hover {
    color: var(--course-text);
    text-decoration: none;
    background: #151010;
    border-left-color: color-mix(in srgb, var(--course-border) 80%, transparent);
}

.nav-list a.active {
    color: var(--course-ink);
    border-left-color: var(--course-accent);
    background: #141010;
    font-weight: 500;
}

.nav-list a.active .nav-title {
    color: var(--course-ink);
}

.nav-list a.active .nav-kind {
    color: var(--course-text-secondary);
    border-color: color-mix(in srgb, var(--course-accent) 45%, var(--course-border) 55%);
}

/* Mobile overlay */
.sidebar-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-normal);
    backdrop-filter: blur(1px);
}

.sidebar-backdrop.is-open {
    opacity: 1;
    pointer-events: auto;
}

/* ----- Main reading column (comfortable measure) ----- */
.reading-body {
    animation: courseFadeIn var(--transition-slow) ease;
    max-width: var(--course-measure);
    margin: 0 auto;
}

.reading-body > *:first-child {
    margin-top: 0;
}

@keyframes courseFadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@media (prefers-reduced-motion: reduce) {
    .content,
    .reading-body {
        animation: none;
    }
    html { scroll-behavior: auto; }
}

.section {
    margin-bottom: var(--spacing-lg);
    padding: 1.35rem 1.25rem;
    background: var(--course-bg-card);
    border: 1px solid color-mix(in srgb, var(--course-border) 80%, #0000);
    border-radius: 3px;
    scroll-margin-top: 1.5rem;
}

.section:hover {
    border-color: color-mix(in srgb, var(--nir-rail-hover) 50%, var(--course-border) 50%);
}

.section-title {
    color: var(--course-ink);
    font-family: var(--nir-serif);
    font-size: 1.32rem;
    font-weight: 600;
    border-bottom: 1px solid var(--course-border);
    padding-bottom: 0.5rem;
    margin-bottom: 0.9rem;
    line-height: 1.35;
}

.subsection {
    margin-top: var(--spacing-md);
    padding-left: 0.9rem;
    border-left: 1px solid var(--course-border);
}

.ritual-block,
.lens-block {
    background: #110c0d;
    padding: 1rem 1.1rem;
    border-radius: 3px;
    border-left: 3px solid var(--course-border-strong);
    margin: 1.15rem 0;
}

.lens-block {
    border-left-color: var(--course-lens);
}

.lens-label {
    color: var(--course-lens);
    font-weight: 500;
    font-family: var(--nir-mono);
    font-size: var(--course-ui-size);
    letter-spacing: 0.12em;
    text-transform: uppercase;
    margin-bottom: 0.45rem;
    display: block;
}

.emphasis-block {
    font-style: italic;
    color: #c0b5a6;
    padding: 0.85rem 1rem;
    background: #120d0e;
    border-left: 2px solid var(--course-border);
    border-radius: 2px;
    margin: 1.15rem 0;
    line-height: var(--course-line);
}

#content > h1:first-child {
    display: none;
}

#content h1 {
    color: var(--course-ink);
    font-size: 1.65rem;
    font-weight: 600;
    border-bottom: 1px solid var(--course-border);
    padding-bottom: 0.4rem;
    margin-top: 2.25rem;
    margin-bottom: 0.85rem;
    scroll-margin-top: 1.5rem;
}

#content h2 {
    color: var(--course-ink);
    font-size: 1.28rem;
    font-weight: 600;
    border-bottom: 1px solid var(--course-border);
    padding-bottom: 0.3rem;
    margin-top: 1.9rem;
    margin-bottom: 0.6rem;
    line-height: 1.3;
    scroll-margin-top: 1.5rem;
}

#content h3 {
    color: var(--course-text);
    font-size: 1.12rem;
    font-weight: 600;
    margin-top: 1.35rem;
    margin-bottom: 0.45rem;
    scroll-margin-top: 1.5rem;
}

#content blockquote {
    border-left: 2px solid var(--course-border-strong);
    padding-left: 1rem;
    margin: 1.15rem 0;
    color: #cdc3b4;
    font-style: italic;
    font-size: 1.01em;
    line-height: 1.75;
}

#content code {
    background: #140e10;
    padding: 0.12em 0.38em;
    border-radius: 2px;
    font-family: var(--nir-mono);
    font-size: 0.9em;
    color: var(--course-code);
    border: 1px solid color-mix(in srgb, var(--course-border) 70%, transparent);
}

#content pre {
    background: #0a0506;
    padding: 1rem 1.1rem;
    border-radius: 3px;
    overflow-x: auto;
    border: 1px solid var(--course-border);
    line-height: 1.55;
    margin: 1rem 0;
}

#content pre code {
    background: none;
    padding: 0;
    border: none;
    color: var(--course-text-secondary);
    font-size: 0.9em;
    line-height: inherit;
}

#content table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.1rem 0;
    font-size: 0.98em;
    line-height: 1.55;
}

#content th,
#content td {
    padding: 0.4rem 0.6rem;
    border: 1px solid var(--course-border);
    text-align: left;
}

#content th {
    background: #150f11;
    color: var(--course-text-secondary);
    font-weight: 600;
    font-family: var(--nir-mono);
    font-size: var(--course-ui-size);
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

#content tr:hover {
    background: #130e10;
}

ul, ol {
    margin: 0 0 1.1em 1.2rem;
    color: var(--course-body);
    font-size: var(--course-body-size);
    line-height: var(--course-line);
}

#content li {
    margin: 0.4em 0;
}

#content li::marker {
    color: var(--course-text-ui);
}

hr {
    border: none;
    border-top: 1px solid var(--course-border);
    margin: 2.25rem 0;
}

.back-to-top {
    position: fixed;
    bottom: max(1.5rem, env(safe-area-inset-bottom, 0));
    right: max(1.25rem, env(safe-area-inset-right, 0));
    background: color-mix(in srgb, #100b0c 90%, #0000);
    color: var(--course-text-ui);
    border: 1px solid var(--course-border);
    border-radius: 50%;
    min-width: 2.75rem;
    min-height: 2.75rem;
    width: 2.75rem;
    height: 2.75rem;
    font-size: 1.05rem;
    line-height: 1;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-normal), visibility var(--transition-normal), color var(--transition-fast), border-color var(--transition-fast);
    z-index: 999;
    font-family: var(--nir-mono);
    backdrop-filter: blur(6px);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    color: var(--course-text);
    border-color: var(--nir-rail-hover);
}

.loading {
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
    background: var(--nir-void);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 2000;
    opacity: 1;
    transition: opacity var(--transition-normal);
}

.loading[aria-busy="false"] {
    opacity: 0;
    pointer-events: none;
}

/* legacy .hidden for loading if ever added by JS */
.loading.hidden {
    opacity: 0;
    pointer-events: none;
}

.spinner {
    width: 2.25rem;
    height: 2.25rem;
    border: 2px solid var(--course-border);
    border-top-color: var(--course-accent);
    border-radius: 50%;
    animation: courseSpin 0.85s linear infinite;
}

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

@media (prefers-reduced-motion: reduce) {
    .spinner { animation: none; border-top-color: var(--course-border); }
}

.loading p {
    margin-top: 1.1rem;
    color: var(--course-text-ui);
    font-family: var(--nir-mono);
    font-size: 0.875rem;
    letter-spacing: 0.04em;
}

.loading.course-load-error p:last-child,
.course-error-detail {
    color: var(--course-text-secondary);
    font-size: 0.9rem;
    margin-top: 0.5rem;
}

/* Footer */
.footer {
    text-align: center;
    padding: 2.5rem 0 1rem;
    border-top: 1px solid var(--course-border);
    margin-top: 2.5rem;
    color: var(--course-text-ui);
    font-size: 0.95rem;
    line-height: 1.5;
    max-width: var(--course-measure);
    margin-left: auto;
    margin-right: auto;
}

.footer-brand {
    font-family: var(--nir-serif);
    color: var(--course-text-secondary);
    margin-bottom: 0.4rem;
}

.footer-note {
    font-family: var(--nir-mono);
    font-size: var(--course-ui-size);
    letter-spacing: 0.08em;
    line-height: 1.4;
    color: var(--course-text-ui);
    margin: 0;
    text-transform: none;
}

.section.course-error .section-title {
    color: var(--course-text);
}

.section.course-error p {
    color: var(--course-text-secondary);
}

/* ----- Preface (title + how to use + first ritual) — digestible front matter ----- */
.codex-preface {
    padding: 1.25rem 1.1rem 1.5rem;
    margin-bottom: 1.5rem;
    border: 1px solid color-mix(in srgb, var(--course-border) 90%, transparent);
    border-radius: 3px;
    background: color-mix(in srgb, var(--course-bg-elev) 40%, transparent);
}

.codex-preface h2 {
    margin-top: 1.25rem;
}

.codex-preface .section-title {
    margin-top: 1.5rem;
}

/* ----- Nine-phase “conquest” map (above longform; built in app.js) ----- */
.journey-mount {
    max-width: var(--course-measure);
    margin: 0 auto 1.5rem;
}

.conquest-journey {
    padding: 1.15rem 1.1rem 1.35rem;
    border: 1px solid var(--course-border);
    border-radius: 4px;
    background: color-mix(in srgb, #150a0d 88%, #0a0506);
    scroll-margin-top: 1rem;
}

.journey-title {
    font-family: var(--nir-serif);
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--course-ink);
    margin: 0 0 0.5rem;
    line-height: 1.25;
}

.journey-lede,
.journey-meta,
.journey-hint {
    font-size: 0.95rem;
    line-height: 1.65;
    color: var(--course-text-secondary);
    margin: 0 0 0.65rem;
}

.journey-meta strong {
    color: var(--course-text);
    font-weight: 600;
}

.journey-hint {
    font-family: var(--nir-mono);
    font-size: 0.72rem;
    letter-spacing: 0.04em;
    color: var(--course-text-ui);
    margin-bottom: 0;
    min-height: 1.25em;
}

.journey-grid {
    list-style: none;
    margin: 1rem 0 0.75rem;
    padding: 0;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(14rem, 1fr));
    gap: 0.65rem;
}

.journey-step {
    margin: 0;
}

.journey-step-link {
    display: flex;
    gap: 0.55rem;
    align-items: flex-start;
    padding: 0.6rem 0.55rem;
    min-height: 2.75rem;
    border: 1px solid color-mix(in srgb, var(--course-border) 85%, transparent);
    border-radius: 3px;
    text-decoration: none;
    color: inherit;
    background: #0d0809;
    transition: border-color var(--transition-fast), background var(--transition-fast);
}

.journey-step-link:hover {
    border-color: var(--nir-rail-hover);
    background: #120a0c;
}

.journey-step--active .journey-step-link {
    border-color: color-mix(in srgb, var(--course-accent) 50%, var(--course-border));
    background: color-mix(in srgb, #1a1012 100%, transparent);
    box-shadow: 0 0 0 1px color-mix(in srgb, var(--course-accent) 25%, transparent);
}

.journey-step-idx {
    flex-shrink: 0;
    width: 1.5rem;
    height: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--nir-mono);
    font-size: 0.65rem;
    font-weight: 600;
    border: 1px solid var(--course-border);
    border-radius: 50%;
    color: var(--course-text-ui);
    margin-top: 0.05rem;
}

.journey-step--active .journey-step-idx {
    color: var(--course-text);
    border-color: var(--course-accent);
}

.journey-step-body {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
    min-width: 0;
}

.journey-step-name {
    font-family: var(--nir-serif);
    font-size: 0.92rem;
    font-weight: 600;
    color: var(--course-text);
    line-height: 1.25;
}

.journey-step-blurb {
    font-size: 0.8rem;
    line-height: 1.45;
    color: var(--course-text-secondary);
}

.journey-step-time {
    font-family: var(--nir-mono);
    font-size: 0.65rem;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--course-text-ui);
}

.filter-opt--map {
    font-family: var(--nir-mono);
    font-size: var(--course-ui-size);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--course-text-ui);
    background: transparent;
    border: 1px solid var(--course-border);
    border-radius: 2px;
    padding: 0.45rem 0.65rem;
    min-height: 2.75rem;
    cursor: pointer;
    transition: color var(--transition-fast), border-color var(--transition-fast);
}

.filter-opt--map:hover {
    color: var(--course-text);
    border-color: var(--nir-rail-hover);
}

/* Phase sections: clearer separation in longform */
.section--phase {
    margin-bottom: 2.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid color-mix(in srgb, var(--course-border) 60%, transparent);
}

.section--phase:last-of-type {
    border-bottom: none;
}

/* Tablet / small desktop */
@media (max-width: 999px) {
    .header {
        padding-top: 2.65rem;
    }
}

@media (max-width: 640px) {
    .main-title {
        font-size: 1.55rem;
    }

    .reading-strap,
    .sidebar-hint {
        font-size: 0.95rem;
    }

    .back-to-top {
        min-width: 2.75rem;
        min-height: 2.75rem;
        width: 2.75rem;
        height: 2.75rem;
    }
}

@media (max-width: 480px) {
    .sidebar {
        width: 100%;
    }
}

/* Print: reading guide */
@media (max-width: 640px) {
    .doc-toolbar {
        flex-direction: column;
        align-items: stretch;
    }

    .lib-shelf-link {
        text-align: center;
        justify-content: center;
    }
}

@media (prefers-contrast: more) {
    :root {
        --course-text: #ffffff;
        --course-text-secondary: #f2ede6;
        --course-text-muted: #e0d8ce;
        --course-text-ui: #e8dfd4;
        --course-ink: #ffffff;
        --course-link: #ffd4c8;
        --course-link-hover: #fff0ec;
        --course-placeholder: #d4ccc0;
        --course-focus-ring: #ffffff;
    }

    .lib-scribble path {
        opacity: 1;
    }
}

@media print {
    .skip-link,
    .sidebar,
    .menu-toggle,
    .back-to-top,
    .progress-container,
    .nir-back,
    .sidebar-backdrop,
    .resume-row,
    .doc-toolbar {
        display: none !important;
    }

    .reading-body {
        max-width: none;
    }

    body {
        background: #fff;
        color: #1a1a1a;
    }

    p, #content p { color: #1a1a1a; }

    .section {
        page-break-inside: avoid;
        border: 1px solid #ccc;
        background: #fafafa;
    }
}