:root {
    --ink: #1f2a2d;
    --muted: #5f6d70;
    --paper: #fbfaf6;
    --paper-deep: #f1eee4;
    --white: #ffffff;
    --navy: #173a4b;
    --navy-dark: #102b38;
    --blue: #2e657a;
    --sage: #6d806f;
    --sage-soft: #e8eee7;
    --gold: #b58b45;
    --gold-soft: #f3ead8;
    --rust: #92513f;
    --line: #d8d9d3;
    --shadow: rgba(31, 42, 45, 0.10);
    --content: 1180px;
    --reading: 760px;
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    margin: 0;
    color: var(--ink);
    background: var(--paper);
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    font-size: 1.05rem;
    line-height: 1.65;
}

img { max-width: 100%; display: block; }
a { color: var(--blue); }

h1, h2, h3, h4 {
    margin-top: 0;
    line-height: 1.15;
    text-wrap: balance;
}

h1, h2, h3 { font-family: Georgia, "Times New Roman", serif; }
p { text-wrap: pretty; }
code, pre { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }

.skip-link {
    position: absolute;
    left: -9999px;
    top: 0;
}

.skip-link:focus {
    left: 1rem;
    top: 1rem;
    z-index: 9999;
    background: var(--white);
    color: var(--navy);
    padding: 0.8rem 1rem;
    border: 2px solid var(--navy);
}

.page-shell,
.header-inner,
.lesson-shell {
    width: min(calc(100% - 2rem), var(--content));
    margin-inline: auto;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(251, 250, 246, 0.96);
    border-bottom: 1px solid var(--line);
    backdrop-filter: blur(10px);
}

.header-inner {
    min-height: 76px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 0.8rem;
    text-decoration: none;
    color: var(--ink);
}

.brand-mark {
    width: 48px;
    height: 48px;
    display: grid;
    place-items: center;
    background: var(--navy);
    color: white;
    border-radius: 10px 10px 10px 2px;
    font-weight: 800;
    letter-spacing: -0.04em;
    box-shadow: inset 0 -4px 0 rgba(255,255,255,0.08);
}

.brand-copy { display: grid; line-height: 1.15; }
.brand-copy strong { font-size: 1.08rem; letter-spacing: 0.05em; }
.brand-copy small { color: var(--muted); font-size: 0.73rem; margin-top: 0.25rem; }

.site-nav { display: flex; gap: 0.35rem; flex-wrap: wrap; }
.site-nav a {
    color: var(--navy);
    text-decoration: none;
    font-weight: 700;
    font-size: 0.92rem;
    padding: 0.65rem 0.8rem;
    border-radius: 8px;
}
.site-nav a:hover,
.site-nav a:focus-visible { background: var(--sage-soft); }

.eyebrow,
.card-label {
    margin: 0 0 0.45rem;
    color: var(--rust);
    font-size: 0.76rem;
    font-weight: 800;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.hero {
    display: grid;
    grid-template-columns: 1.25fr 0.75fr;
    gap: clamp(2rem, 5vw, 5rem);
    align-items: center;
    padding-block: clamp(4rem, 8vw, 7rem);
}

.hero h1 {
    max-width: 13ch;
    margin-bottom: 1.25rem;
    color: var(--navy-dark);
    font-size: clamp(2.8rem, 6.5vw, 5.4rem);
    letter-spacing: -0.035em;
}

.hero-lede {
    max-width: 64ch;
    color: var(--muted);
    font-size: clamp(1.12rem, 2vw, 1.28rem);
}

.hero-actions { display: flex; gap: 0.75rem; flex-wrap: wrap; margin-top: 1.75rem; }

.button {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    min-height: 48px;
    padding: 0.8rem 1.15rem;
    border-radius: 8px;
    border: 1px solid transparent;
    text-decoration: none;
    font: inherit;
    font-weight: 800;
    cursor: pointer;
}
.button-primary { background: var(--navy); color: white; }
.button-primary:hover, .button-primary:focus-visible { background: var(--navy-dark); }
.button-secondary { background: transparent; color: var(--navy); border-color: #aab8ba; }
.button-secondary:hover, .button-secondary:focus-visible { background: var(--sage-soft); }
.button-secondary.light { color: white; border-color: rgba(255,255,255,0.45); }
.button-secondary.light:hover, .button-secondary.light:focus-visible { background: rgba(255,255,255,0.10); }

.orientation-card {
    padding: 1.5rem;
    background: var(--white);
    border: 1px solid var(--line);
    border-top: 5px solid var(--gold);
    box-shadow: 0 16px 40px var(--shadow);
}
.orientation-card h2 { color: var(--navy); font-size: 1.8rem; }
.orientation-list { list-style: none; padding: 0; margin: 1.4rem 0; display: grid; gap: 1rem; }
.orientation-list li { display: grid; grid-template-columns: 2.2rem 1fr; gap: 0.8rem; align-items: start; }
.orientation-list li > span {
    width: 2.1rem; height: 2.1rem; display: grid; place-items: center;
    border-radius: 50%; background: var(--sage-soft); color: var(--navy); font-weight: 800;
}
.orientation-list p { margin: 0; color: var(--muted); }
.orientation-list strong { color: var(--ink); }
.availability-note { margin: 1.2rem -1.5rem -1.5rem; padding: 1rem 1.5rem; background: var(--gold-soft); color: #5a4730; }

.section { padding-block: clamp(3.5rem, 7vw, 6rem); }
.section-tint { background: var(--paper-deep); border-block: 1px solid var(--line); }

.section-heading {
    display: grid;
    grid-template-columns: 1fr minmax(18rem, 0.8fr);
    gap: 2rem;
    align-items: end;
    margin-bottom: 2rem;
}
.section-heading h2 { margin-bottom: 0; color: var(--navy-dark); font-size: clamp(2rem, 4vw, 3.2rem); }
.section-heading > p { margin: 0; color: var(--muted); }

.featured-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.25rem; }
.guide-card {
    padding: 1.5rem;
    background: var(--white);
    border: 1px solid var(--line);
    box-shadow: 0 12px 28px var(--shadow);
}
.guide-card-featured { border-top: 5px solid var(--sage); }
.guide-meta { display: flex; gap: 0.65rem; flex-wrap: wrap; align-items: center; color: var(--muted); font-size: 0.85rem; }
.status {
    display: inline-flex;
    align-items: center;
    width: fit-content;
    padding: 0.2rem 0.5rem;
    border-radius: 999px;
    color: #687273;
    background: #eceeeb;
    font-size: 0.72rem;
    font-weight: 800;
    white-space: nowrap;
}
.status-live { color: #31533a; background: #dfeade; }
.guide-card h3 { margin: 0.85rem 0; color: var(--navy); font-size: 1.7rem; }
.guide-card p { color: var(--muted); }
.guide-points { padding-left: 1.1rem; color: var(--ink); }
.text-link { display: inline-flex; gap: 0.35rem; align-items: center; margin-top: 0.5rem; font-weight: 800; text-decoration-thickness: 2px; text-underline-offset: 0.2em; }

.track-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
.track-card { padding: 1.4rem; background: var(--paper); border: 1px solid var(--line); }
.track-card-wide { grid-column: 1 / -1; }
.track-heading { display: grid; grid-template-columns: auto 1fr; gap: 1rem; align-items: start; margin-bottom: 1rem; }
.track-number { color: var(--gold); font: 700 2.2rem/1 Georgia, serif; }
.track-heading h3 { margin-bottom: 0; color: var(--navy); font-size: 1.45rem; }
.curriculum-list { list-style: none; padding: 0; margin: 0; }
.curriculum-list li {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    align-items: center;
    padding: 0.8rem 0;
    border-top: 1px solid var(--line);
}
.curriculum-list li > span:first-child { padding-right: 0.5rem; }
.curriculum-list li.available { font-weight: 700; }
.curriculum-list li.available a { font-size: 0.82rem; font-weight: 800; }
.resource-columns { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; }

.about-grid { display: grid; grid-template-columns: 0.8fr 1.2fr; gap: clamp(2rem, 5vw, 5rem); }
.about-grid h2 { color: var(--navy-dark); font-size: clamp(2.2rem, 4vw, 3.5rem); }
.about-copy > p { color: var(--muted); font-size: 1.08rem; }
.principle-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; margin-top: 1.5rem; }
.principle-grid div { padding: 1rem; background: var(--white); border-left: 4px solid var(--gold); }
.principle-grid strong { display: block; color: var(--navy); }
.principle-grid span { display: block; margin-top: 0.25rem; color: var(--muted); }

.development-banner { background: var(--navy); color: white; padding-block: 2.5rem; }
.development-inner { display: flex; justify-content: space-between; gap: 2rem; align-items: center; }
.development-banner .eyebrow { color: #e5c990; }
.development-banner h2 { margin-bottom: 0.4rem; font-size: 2rem; }
.development-banner p { margin-bottom: 0; color: #d7e1e5; max-width: 65ch; }

.site-footer { background: var(--navy-dark); color: white; }
.footer-inner { min-height: 120px; display: flex; justify-content: space-between; gap: 1rem; align-items: center; }
.footer-inner p { margin: 0.2rem 0 0; color: #cbd8dc; }
.footer-note { text-align: right; }
.site-footer a { color: white; }

/* Lessons */
.lesson-page { background: #f7f5ef; }
.lesson-shell { padding-block: 2rem 5rem; }
.breadcrumb { display: flex; gap: 0.55rem; align-items: center; color: var(--muted); font-size: 0.9rem; margin-bottom: 2rem; }
.breadcrumb a { font-weight: 700; }
.lesson-header {
    display: grid;
    grid-template-columns: 1fr 18rem;
    gap: 3rem;
    align-items: end;
    padding-bottom: 2.5rem;
    border-bottom: 2px solid var(--navy);
}
.lesson-heading-copy h1 { color: var(--navy-dark); font-size: clamp(2.6rem, 6vw, 4.8rem); letter-spacing: -0.03em; margin-bottom: 1rem; }
.lesson-deck { color: var(--muted); font-size: 1.2rem; max-width: 66ch; }
.lesson-facts { margin: 0; border-top: 4px solid var(--gold); background: var(--white); }
.lesson-facts div { padding: 0.8rem 1rem; border-bottom: 1px solid var(--line); }
.lesson-facts dt { color: var(--muted); font-size: 0.72rem; font-weight: 800; text-transform: uppercase; letter-spacing: 0.1em; }
.lesson-facts dd { margin: 0.15rem 0 0; font-weight: 700; }

.lesson-layout { display: grid; grid-template-columns: 14rem minmax(0, var(--reading)); gap: 3rem; justify-content: center; align-items: start; margin-top: 2.5rem; }
.lesson-toc { position: sticky; top: 100px; display: grid; gap: 0.2rem; padding: 1rem; border-left: 3px solid var(--gold); background: var(--white); }
.lesson-toc a { color: var(--ink); text-decoration: none; padding: 0.4rem 0; font-size: 0.92rem; }
.lesson-toc a:hover, .lesson-toc a:focus-visible { color: var(--blue); text-decoration: underline; }

.lesson-content { min-width: 0; }
.lesson-section { padding-block: 0 3.25rem; margin-bottom: 3.25rem; border-bottom: 1px solid var(--line); scroll-margin-top: 110px; }
.section-number { margin: 0 0 0.5rem; color: var(--gold); font: 700 1.2rem/1 Georgia, serif; }
.lesson-section h2 { color: var(--navy-dark); font-size: clamp(1.8rem, 4vw, 2.55rem); }
.lesson-section h3 { color: var(--navy); }
.lesson-section p, .lesson-section li { max-width: 72ch; }

.concept-pair, .question-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.8rem; margin-block: 1.2rem; }
.concept-pair div, .question-grid article { padding: 1rem; background: var(--white); border: 1px solid var(--line); }
.concept-pair strong { display: block; color: var(--navy); font-size: 1.1rem; }
.concept-pair span { display: block; color: var(--muted); margin-top: 0.25rem; }
.question-grid article > span { width: 2rem; height: 2rem; display: grid; place-items: center; border-radius: 50%; background: var(--sage-soft); color: var(--navy); font-weight: 800; }
.question-grid h3 { margin: 0.65rem 0 0.35rem; }
.question-grid p { margin: 0; color: var(--muted); }

.callout { margin-block: 1.4rem; padding: 1rem 1.1rem; border-left: 5px solid var(--sage); background: var(--sage-soft); }
.callout-warning { border-left-color: var(--rust); background: #f4e7e2; }

pre {
    overflow-x: auto;
    padding: 1.1rem;
    color: #eef4f5;
    background: var(--navy-dark);
    border-radius: 6px;
    line-height: 1.5;
}
:not(pre) > code { padding: 0.12em 0.35em; background: #ebe9e2; border-radius: 4px; font-size: 0.92em; }

.step-list { list-style: none; padding: 0; display: grid; gap: 0.85rem; }
.step-list li { display: grid; grid-template-columns: 2.4rem 1fr; gap: 0.9rem; align-items: start; }
.step-list li > span { width: 2.25rem; height: 2.25rem; display: grid; place-items: center; border-radius: 50%; background: var(--navy); color: white; font-weight: 800; }
.step-list p { margin: 0.15rem 0 0; color: var(--muted); }
.step-list.compact { gap: 0.7rem; }

.checklist-section { border-bottom: 0; }
.check-list { list-style: none; padding: 0; display: grid; gap: 0.6rem; }
.check-list li { position: relative; padding-left: 2rem; }
.check-list li::before { content: "□"; position: absolute; left: 0; color: var(--sage); font-size: 1.4rem; line-height: 1; }

.source-ladder { margin-block: 1.2rem; border: 1px solid var(--line); background: var(--white); }
.source-ladder div { display: grid; grid-template-columns: 10rem 1fr; gap: 1rem; padding: 0.9rem 1rem; border-top: 1px solid var(--line); }
.source-ladder div:first-child { border-top: 0; }
.source-ladder strong { color: var(--navy); }
.source-ladder span { color: var(--muted); }

.lesson-next { display: flex; justify-content: space-between; gap: 1rem; align-items: center; padding-top: 1.25rem; border-top: 2px solid var(--navy); }
.lesson-next span { color: var(--muted); font-size: 0.9rem; }
.lesson-next a { font-weight: 800; }

@media (max-width: 900px) {
    .hero, .section-heading, .about-grid, .lesson-header { grid-template-columns: 1fr; }
    .track-grid, .featured-grid { grid-template-columns: 1fr; }
    .track-card-wide { grid-column: auto; }
    .lesson-layout { grid-template-columns: 1fr; }
    .lesson-toc { position: static; grid-template-columns: repeat(2, minmax(0, 1fr)); border-left: 0; border-top: 3px solid var(--gold); }
    .lesson-toc .card-label { grid-column: 1 / -1; }
}

@media (max-width: 680px) {
    body { font-size: 1rem; }
    .header-inner { align-items: flex-start; padding-block: 0.8rem; }
    .header-inner, .development-inner, .footer-inner { flex-direction: column; }
    .header-inner { display: flex; }
    .brand-copy small { display: none; }
    .site-nav { width: 100%; overflow-x: auto; flex-wrap: nowrap; padding-bottom: 0.2rem; }
    .site-nav a { white-space: nowrap; }
    .hero { padding-block: 3.5rem; }
    .hero h1 { font-size: clamp(2.5rem, 12vw, 3.8rem); }
    .resource-columns, .principle-grid, .concept-pair, .question-grid { grid-template-columns: 1fr; }
    .curriculum-list li { align-items: flex-start; }
    .section-heading { gap: 0.75rem; }
    .development-inner, .footer-inner { align-items: flex-start; padding-block: 1.5rem; }
    .footer-note { text-align: left; }
    .lesson-toc { grid-template-columns: 1fr; }
    .source-ladder div { grid-template-columns: 1fr; gap: 0.2rem; }
    .lesson-next { align-items: flex-start; flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}