:root {
    /* Color tokens per BRAND.md */
    --charcoal: #2a2a2a;
    --rich-black: #3a3a3a;
    --graphite: #666;
    --warm-gray: #555;
    --slate: #999;
    --silver: #d0d0d0;
    --light-gray: #e0e0e0;
    --warm-white: #fafaf8;
    --off-white: #f9f9f7;
    --ambient: #f5f5f0;
    --coral: #ff6b6b;
    --coral-light: #ff8f8f;
    --coral-deep: #e85555;

    --font-sans: 'Futura', 'Avenir', 'Montserrat', sans-serif;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background: var(--ambient);
    color: var(--rich-black);
    font-weight: 400;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.page {
    max-width: 860px;
    margin: 40px auto;
    background: var(--warm-white);
    padding: 80px 90px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    position: relative;
}

/* Paper-grain overlay */
.page::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: repeating-linear-gradient(
        0deg,
        transparent,
        transparent 2px,
        rgba(0, 0, 0, 0.01) 2px,
        rgba(0, 0, 0, 0.01) 4px
    );
    pointer-events: none;
}

.page > * {
    position: relative;
}

/* ---------- Masthead ---------- */
.masthead {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--silver);
    margin-bottom: 50px;
}

.wordmark {
    font-size: 22px;
    font-weight: 300;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--charcoal);
}

.masthead-subtitle {
    font-size: 11px;
    color: var(--graphite);
    letter-spacing: 1px;
    text-transform: uppercase;
}

/* ---------- Hairline rule ---------- */
.rule {
    border: 0;
    border-top: 1px solid var(--silver);
    margin: 70px 0;
}

/* ---------- Hero ---------- */
.hero {
    margin-top: 60px;
    margin-bottom: 30px;
    max-width: 720px;
}

.hero .headline {
    font-size: 30px;
    font-weight: 400;
    line-height: 1.3;
    color: var(--charcoal);
    letter-spacing: -0.2px;
}

/* ---------- Figure / caption ---------- */
.figure {
    margin: 0;
}

.figure-frame {
    background: var(--off-white);
    border: 1px solid var(--light-gray);
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.figure-frame img {
    display: block;
    width: 100%;
    height: auto;
}

/* Placeholder shown until figure image is generated */
.figure-placeholder {
    width: 100%;
    aspect-ratio: 3 / 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 14px;
    color: var(--slate);
    text-align: center;
    background:
        repeating-linear-gradient(
            45deg,
            transparent,
            transparent 10px,
            rgba(0, 0, 0, 0.02) 10px,
            rgba(0, 0, 0, 0.02) 20px
        ),
        var(--off-white);
}

.figure-placeholder.square {
    aspect-ratio: 1 / 1;
}

.figure-placeholder .ph-label {
    font-size: 9px;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: var(--graphite);
    margin-bottom: 6px;
}

.figure-placeholder .ph-desc {
    font-size: 10px;
    font-style: italic;
    color: var(--graphite);
    line-height: 1.4;
}

.caption {
    font-size: 11px;
    color: var(--warm-gray);
    font-style: italic;
    line-height: 1.5;
    margin-top: 10px;
}

.caption strong {
    font-weight: 600;
    font-style: normal;
    color: var(--graphite);
}

/* ---------- Definition block ---------- */
.definition {
    background: #fff;
    border: 1px solid var(--light-gray);
    padding: 30px 40px;
    margin: 60px 0;
}

.definition-label {
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--graphite);
    margin-bottom: 16px;
}

.definition-word {
    font-size: 30px;
    font-weight: 600;
    color: var(--charcoal);
    letter-spacing: 0.5px;
}

.definition-pos {
    font-size: 13px;
    color: var(--graphite);
    font-style: italic;
    margin-top: 4px;
    margin-bottom: 20px;
}

.definition-list {
    list-style: none;
    counter-reset: def;
    margin-bottom: 20px;
}

.definition-list li {
    counter-increment: def;
    font-size: 14px;
    color: var(--rich-black);
    line-height: 1.7;
    margin-bottom: 10px;
    padding-left: 26px;
    position: relative;
}

.definition-list li::before {
    content: counter(def) ".";
    position: absolute;
    left: 0;
    color: var(--graphite);
    font-weight: 600;
}

.definition-etymology {
    font-size: 12px;
    color: var(--warm-gray);
    font-style: italic;
    line-height: 1.6;
    padding-top: 16px;
    border-top: 1px solid var(--light-gray);
}

/* ---------- Chapter ---------- */
.chapter-label {
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--graphite);
    margin-bottom: 10px;
}

.chapter-title {
    font-size: 22px;
    font-weight: 400;
    font-style: italic;
    color: var(--charcoal);
    margin-bottom: 30px;
    letter-spacing: -0.1px;
}

.chapter-intro {
    font-size: 16px;
    color: var(--rich-black);
    line-height: 1.7;
    margin-bottom: 50px;
    max-width: 620px;
}

/* ---------- Chapter body ---------- */
.chapter-grid {
    display: grid;
    grid-template-columns: 1fr 200px;
    gap: 50px;
    align-items: start;
}

.chapter-body {
    max-width: 620px;
}

.chapter-body p {
    font-size: 15px;
    color: var(--rich-black);
    line-height: 1.75;
    margin-bottom: 18px;
}

.chapter-body p:last-child {
    margin-bottom: 0;
}

/* ---------- Engagement grid ---------- */
.engagements {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px 50px;
    margin-top: 30px;
}

.engagement-title {
    font-size: 15px;
    font-weight: 600;
    letter-spacing: 0.5px;
    color: var(--charcoal);
    margin-bottom: 12px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--light-gray);
}

.engagement-body {
    font-size: 14px;
    color: var(--rich-black);
    line-height: 1.7;
}

/* ---------- Author ---------- */
.author {
    display: grid;
    grid-template-columns: 1fr 200px;
    gap: 50px;
    align-items: start;
    margin-top: 30px;
}

.portrait-frame {
    border: 1px solid var(--light-gray);
    background: var(--off-white);
    padding: 8px;
}

.portrait-frame img {
    display: block;
    width: 100%;
    height: auto;
    filter: grayscale(100%);
}

.portrait-caption {
    margin-top: 12px;
    text-align: center;
    line-height: 1.4;
}

.portrait-caption .author-name {
    font-size: 13px;
    font-weight: 600;
    color: var(--charcoal);
    letter-spacing: 0.3px;
}

.portrait-caption .author-role {
    font-size: 11px;
    font-style: italic;
    color: var(--graphite);
    margin-top: 2px;
}

.author-body {
    font-size: 14px;
    color: var(--rich-black);
    line-height: 1.75;
    margin-bottom: 16px;
}

/* ---------- Chapter CTA ---------- */
.chapter-cta {
    margin-top: 50px;
    padding: 30px 0 10px;
    text-align: center;
    border-top: 1px solid var(--light-gray);
}

.chapter-cta-copy {
    font-size: 15px;
    font-style: italic;
    color: var(--rich-black);
    line-height: 1.6;
    margin-bottom: 16px;
    max-width: 520px;
    margin-left: auto;
    margin-right: auto;
}

.email-cta {
    display: inline-block;
    font-size: 20px;
    letter-spacing: 0.5px;
    color: var(--charcoal);
    text-decoration: none;
    padding: 4px 0;
    border-bottom: 1px solid transparent;
    transition: color 0.15s ease, border-color 0.15s ease;
}

.email-cta:hover,
.email-cta:focus-visible {
    color: var(--coral);
    border-bottom-color: var(--coral);
}

.email-cta:active {
    color: var(--coral-deep);
}

/* ---------- Footer ---------- */
.footer {
    margin-top: 60px;
    padding-top: 24px;
    border-top: 1px solid var(--silver);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.footer .wordmark {
    font-size: 14px;
    letter-spacing: 2px;
}

.footer-links {
    display: flex;
    gap: 24px;
    font-size: 12px;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.footer-links a {
    color: var(--warm-gray);
    text-decoration: none;
    transition: color 0.15s ease;
}

.footer-links a:hover,
.footer-links a:focus-visible {
    color: var(--coral);
}

/* ---------- Mobile ---------- */
@media (max-width: 720px) {
    .page {
        margin: 16px;
        padding: 40px 28px;
    }

    .chapter-grid,
    .engagements,
    .author {
        grid-template-columns: 1fr;
        gap: 28px;
    }

    .hero .headline {
        font-size: 24px;
    }

    .definition {
        padding: 24px 0;
        margin: 40px 0;
    }

    .chapter-intro {
        margin-bottom: 32px;
    }

    .portrait-frame {
        max-width: 220px;
    }

    .rule {
        margin: 50px 0;
    }
}