/* ========================================================================
   economic.wiki — A calm place for understanding how economies work
   Mid-century editorial design. Burnt-orange terracotta palette.
   ======================================================================== */

:root {
    --color-burnt-sienna: #c4763a;
    --color-deep-umber: #7a3b1e;
    --color-aged-cream: #f5efe6;
    --color-warm-bisque: #ecddc8;
    --color-warm-bisque-deep: #deccb2;
    --color-charcoal-walnut: #2b1810;
    --color-deep-espresso: #3d2e24;
    --color-warm-taupe: #8a6d5b;
    --color-pale-linen: #f0e8dc;
    --color-oxidized-copper: #b85c38;
    --color-slate-olive: #6b7c6e;

    --font-display: "Playfair Display", "Lora", Georgia, serif;
    --font-body: "Source Serif 4", "Lora", Georgia, serif;
    --font-sans: "DM Sans", "Inter", system-ui, sans-serif;

    --rail-margin: 12vw;
    --rail-max: 720px;
    --margin-offset: 4vw;

    --ease-essay: cubic-bezier(0.25, 0.1, 0.25, 1.0);
}

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

html {
    scroll-behavior: smooth;
    scroll-snap-type: y proximity;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    font-weight: 400;
    color: var(--color-deep-espresso);
    background-color: var(--color-aged-cream);
    line-height: 1.72;
    overflow-x: hidden;
}

/* ------------------------------------------------------------------------
   Roman Numeral Navigation
   ------------------------------------------------------------------------ */
.roman-nav {
    position: fixed;
    bottom: 2rem;
    left: 2rem;
    z-index: 100;
    pointer-events: auto;
}

.roman-nav ol {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
}

.roman-nav a {
    display: flex;
    align-items: baseline;
    gap: 0.85rem;
    text-decoration: none;
    font-family: var(--font-sans);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-warm-taupe);
    opacity: 0.4;
    transition: opacity 360ms var(--ease-essay), color 360ms var(--ease-essay), transform 360ms var(--ease-essay);
}

.roman-nav .numeral {
    display: inline-block;
    min-width: 2.4em;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 0.95rem;
    letter-spacing: 0.04em;
}

.roman-nav .nav-label {
    font-family: var(--font-sans);
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.18em;
    opacity: 0;
    transform: translateX(-6px);
    transition: opacity 320ms var(--ease-essay), transform 320ms var(--ease-essay);
}

.roman-nav a:hover {
    opacity: 1;
    color: var(--color-deep-umber);
    transform: translateX(2px);
}

.roman-nav a:hover .nav-label {
    opacity: 0.85;
    transform: translateX(0);
}

.roman-nav a.is-active {
    opacity: 1;
    color: var(--color-burnt-sienna);
}

.roman-nav a.is-active .nav-label {
    opacity: 1;
    transform: translateX(0);
    color: var(--color-burnt-sienna);
}

/* dark sections invert the nav contrast */
body.is-dark .roman-nav a {
    color: var(--color-pale-linen);
    opacity: 0.35;
}
body.is-dark .roman-nav a.is-active {
    opacity: 1;
    color: var(--color-burnt-sienna);
}
body.is-dark .roman-nav a:hover {
    opacity: 0.95;
    color: var(--color-pale-linen);
}

/* ------------------------------------------------------------------------
   Section Skeleton
   ------------------------------------------------------------------------ */
.essay {
    display: block;
}

.section {
    position: relative;
    width: 100vw;
    min-height: 100vh;
    padding-block: 15vh;
    padding-inline: 0;
    overflow: hidden;
    scroll-snap-align: start;
    scroll-snap-stop: normal;
}

.section + .section {
    border-top: 2px solid rgba(196, 118, 58, 0.3);
}

.background-field {
    position: absolute;
    inset: 0;
    z-index: 0;
}
.background-field--cream      { background-color: var(--color-aged-cream); }
.background-field--cream-deep { background-color: var(--color-warm-bisque-deep); }
.background-field--bisque     { background-color: var(--color-warm-bisque); }
.background-field--bisque-warm{ background-color: var(--color-warm-bisque); }
.background-field--olive      { background-color: var(--color-slate-olive); }
.background-field--dark       { background-color: var(--color-charcoal-walnut); }

/* dot grid pattern overlay */
.dot-grid {
    position: absolute;
    inset: 0;
    background-image: radial-gradient(circle, rgba(196, 118, 58, 0.18) 1.6px, transparent 1.7px);
    background-size: 24px 24px;
    background-position: 0 0;
    pointer-events: none;
}
.dot-grid--dense {
    background-size: 18px 18px;
    background-image: radial-gradient(circle, rgba(184, 92, 56, 0.22) 1.4px, transparent 1.6px);
}
.dot-grid--inverted {
    background-image: radial-gradient(circle, rgba(196, 118, 58, 0.28) 1.4px, transparent 1.6px);
    background-size: 26px 26px;
}

/* diagonal hatching */
.hatch-pattern {
    position: absolute;
    inset: 0;
    background-image: repeating-linear-gradient(
        45deg,
        rgba(122, 59, 30, 0.08) 0px,
        rgba(122, 59, 30, 0.08) 1px,
        transparent 1px,
        transparent 12px
    );
    pointer-events: none;
}
.hatch-pattern--soft {
    background-image: repeating-linear-gradient(
        45deg,
        rgba(196, 118, 58, 0.06) 0px,
        rgba(196, 118, 58, 0.06) 1px,
        transparent 1px,
        transparent 14px
    );
}

/* concentric corner arcs */
.corner-arc {
    position: absolute;
    width: 38vw;
    max-width: 480px;
    aspect-ratio: 1 / 1;
    pointer-events: none;
}
.corner-arc--tr { top: 0;    right: 0;  transform: translate(15%, -15%); }
.corner-arc--bl { bottom: 0; left: 0;   transform: translate(-15%, 15%); }

/* ------------------------------------------------------------------------
   Title Card (Chapter I)
   ------------------------------------------------------------------------ */
.section--title {
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    min-height: 100vh;
}

.title-card {
    position: relative;
    z-index: 2;
    padding: 2rem;
    max-width: 90vw;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.6rem;
}

.overline {
    font-family: var(--font-sans);
    font-size: 0.78rem;
    font-weight: 500;
    letter-spacing: 0.32em;
    text-transform: uppercase;
    color: var(--color-warm-taupe);
}

.hero-title {
    font-family: var(--font-display);
    font-weight: 900;
    font-size: clamp(2.6rem, 9vw, 7.6rem);
    line-height: 1.0;
    letter-spacing: 0.005em;
    color: var(--color-charcoal-walnut);
    display: inline-flex;
    align-items: baseline;
    flex-wrap: wrap;
    justify-content: center;
}

.hero-title__word {
    font-style: normal;
}
.hero-title__word--alt {
    font-style: italic;
    color: var(--color-deep-umber);
}
.hero-title__dot {
    color: var(--color-burnt-sienna);
    font-weight: 900;
}

.hero-subtitle {
    font-family: var(--font-body);
    font-style: italic;
    font-weight: 400;
    font-size: clamp(1.05rem, 1.6vw, 1.4rem);
    color: var(--color-deep-espresso);
    max-width: 38ch;
    line-height: 1.5;
}

.starburst {
    margin-top: 0.6rem;
}

.scroll-cue {
    font-family: var(--font-sans);
    font-size: 0.72rem;
    font-weight: 500;
    letter-spacing: 0.32em;
    text-transform: uppercase;
    color: var(--color-warm-taupe);
    margin-top: 3rem;
    display: inline-flex;
    align-items: center;
    gap: 0.8rem;
}
.scroll-cue__arrow {
    display: inline-block;
    font-size: 1rem;
    animation: gentle-drop 2.6s var(--ease-essay) infinite;
}
@keyframes gentle-drop {
    0%, 100% { transform: translateY(0); opacity: 0.5; }
    50%      { transform: translateY(6px); opacity: 1;   }
}

/* ------------------------------------------------------------------------
   Reading Rail (chapters II–VII)
   ------------------------------------------------------------------------ */
.reading-rail {
    position: relative;
    z-index: 2;
    margin-left: var(--rail-margin);
    max-width: var(--rail-max);
    padding-right: 2rem;
}

.reading-rail--inverted {
    /* same geometry, content uses inverted text colors */
}

.chapter-mark {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2.5rem;
    font-family: var(--font-sans);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--color-deep-umber);
}
.chapter-mark--inverted {
    color: var(--color-pale-linen);
}
.chapter-numeral {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.05rem;
    letter-spacing: 0.04em;
    color: var(--color-burnt-sienna);
    min-width: 2em;
}
.chapter-line {
    flex: 0 0 64px;
    height: 1px;
    background: currentColor;
    opacity: 0.5;
}
.chapter-name {
    font-weight: 500;
    letter-spacing: 0.22em;
}

.section-title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(1.6rem, 3.4vw, 2.9rem);
    line-height: 1.15;
    letter-spacing: 0.005em;
    color: var(--color-charcoal-walnut);
    margin-bottom: 2.4rem;
    max-width: 22ch;
}
.section-title--inverted {
    color: var(--color-pale-linen);
}

.lede {
    font-family: var(--font-body);
    font-size: clamp(1.1rem, 1.3vw, 1.32rem);
    font-weight: 400;
    line-height: 1.6;
    color: var(--color-deep-espresso);
    margin-bottom: 1.6rem;
    max-width: 60ch;
    font-style: italic;
}

.body-text {
    font-family: var(--font-body);
    font-size: clamp(1rem, 1.1vw, 1.18rem);
    font-weight: 400;
    line-height: 1.72;
    color: var(--color-deep-espresso);
    margin-bottom: 1.4rem;
    max-width: 65ch;
}
.body-text--inverted {
    color: var(--color-pale-linen);
}

.body-text em,
.lede em {
    font-style: italic;
    color: var(--color-deep-umber);
}
.body-text--inverted em {
    color: var(--color-burnt-sienna);
    font-style: italic;
}

.pull-quote {
    border-left: 2px solid var(--color-burnt-sienna);
    padding: 1rem 0 1rem 1.6rem;
    margin: 2.4rem 0 2.4rem -1rem;
    max-width: 56ch;
}
.pull-quote p {
    font-family: var(--font-display);
    font-style: italic;
    font-weight: 400;
    font-size: clamp(1.3rem, 1.9vw, 1.85rem);
    line-height: 1.35;
    color: var(--color-deep-umber);
}
.pull-quote cite {
    display: block;
    margin-top: 0.8rem;
    font-family: var(--font-sans);
    font-style: normal;
    font-size: 0.78rem;
    font-weight: 500;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--color-warm-taupe);
}
.pull-quote--inverted {
    border-left-color: var(--color-burnt-sienna);
}
.pull-quote--inverted p {
    color: var(--color-pale-linen);
}
.pull-quote--inverted cite {
    color: var(--color-warm-bisque-deep);
}

/* ------------------------------------------------------------------------
   Margin Notes
   ------------------------------------------------------------------------ */
.margin-note {
    position: absolute;
    z-index: 2;
    top: 22vh;
    left: calc(var(--rail-margin) + var(--rail-max) + var(--margin-offset));
    width: min(22vw, 280px);
    padding: 1.4rem 1.4rem 1.6rem;
    background-color: rgba(245, 239, 230, 0.82);
    box-shadow:
        2px 4px 0 var(--color-warm-bisque),
        4px 8px 0 var(--color-warm-bisque-deep);
}
.section--bisque .margin-note,
.section--cream-deep .margin-note {
    background-color: rgba(245, 239, 230, 0.94);
}
.section--olive .margin-note--inverted,
.section--dark .margin-note--inverted {
    background-color: rgba(43, 24, 16, 0.55);
    box-shadow:
        2px 4px 0 rgba(196, 118, 58, 0.4),
        4px 8px 0 rgba(122, 59, 30, 0.45);
}

.margin-note__label {
    font-family: var(--font-sans);
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--color-burnt-sienna);
    margin-bottom: 0.6rem;
}
.margin-note__body {
    font-family: var(--font-sans);
    font-size: 0.94rem;
    font-weight: 400;
    line-height: 1.55;
    letter-spacing: 0.01em;
    color: var(--color-warm-taupe);
    margin-bottom: 1rem;
}
.margin-note--inverted .margin-note__label {
    color: var(--color-burnt-sienna);
}
.margin-note--inverted .margin-note__body {
    color: var(--color-pale-linen);
}

.margin-note__body em {
    font-style: italic;
    color: var(--color-deep-umber);
}
.margin-note--inverted .margin-note__body em {
    color: var(--color-burnt-sienna);
}

.margin-illustration {
    margin-top: 0.8rem;
    width: 100%;
}
.margin-illustration svg {
    display: block;
    width: 100%;
    height: auto;
}

/* ------------------------------------------------------------------------
   Closing
   ------------------------------------------------------------------------ */
.closing-mark {
    margin: 3.2rem 0 2rem;
}

.colophon {
    margin-top: 1.4rem;
    border-top: 1px solid rgba(240, 232, 220, 0.2);
    padding-top: 1.4rem;
    max-width: 40ch;
}
.colophon__line {
    font-family: var(--font-sans);
    font-size: 0.85rem;
    font-weight: 500;
    letter-spacing: 0.06em;
    color: var(--color-pale-linen);
    margin-bottom: 0.45rem;
}
.colophon__line:first-child {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    color: var(--color-burnt-sienna);
    margin-bottom: 0.8rem;
}
.colophon__line--small {
    font-size: 0.78rem;
    font-weight: 400;
    color: var(--color-warm-bisque-deep);
    opacity: 0.85;
    letter-spacing: 0.04em;
}

/* ------------------------------------------------------------------------
   Reveal Animations (slide-reveal)
   ------------------------------------------------------------------------ */
.reveal-left,
.reveal-up,
.reveal-fade {
    opacity: 0;
    will-change: opacity, transform;
    transition:
        opacity 600ms var(--ease-essay),
        transform 600ms var(--ease-essay);
}
.reveal-left  { transform: translateX(-40px); }
.reveal-up    { transform: translateY(28px);  }
.reveal-fade  { transform: translateY(8px);   }

/* margin notes slide in from the right with delay */
.margin-note.reveal-fade { transform: translateX(40px); transition-delay: 200ms; }

.is-revealed.reveal-left,
.is-revealed.reveal-up,
.is-revealed.reveal-fade,
.margin-note.reveal-fade.is-revealed {
    opacity: 1;
    transform: translate(0, 0);
}

/* ------------------------------------------------------------------------
   Responsive
   ------------------------------------------------------------------------ */
@media (max-width: 1100px) {
    :root {
        --rail-margin: 8vw;
    }
    .margin-note {
        left: auto;
        right: 4vw;
        top: 18vh;
        width: min(28vw, 240px);
    }
}

@media (max-width: 768px) {
    :root {
        --rail-margin: 6vw;
    }
    .section {
        padding-block: 12vh;
    }
    .reading-rail {
        margin-left: 6vw;
        margin-right: 6vw;
        padding-right: 0;
        max-width: none;
    }
    .margin-note {
        position: relative;
        left: auto;
        right: auto;
        top: auto;
        width: auto;
        max-width: none;
        margin: 2.4rem 6vw 0;
    }
    .margin-note.reveal-fade {
        transform: translateY(20px);
    }
    .roman-nav {
        bottom: 1rem;
        left: 1rem;
    }
    .roman-nav .nav-label {
        display: none;
    }
    .corner-arc {
        width: 60vw;
    }
    .pull-quote {
        margin-left: 0;
    }
}

@media (prefers-reduced-motion: reduce) {
    .reveal-left,
    .reveal-up,
    .reveal-fade,
    .margin-note.reveal-fade {
        opacity: 1;
        transform: none;
        transition: none;
    }
    .scroll-cue__arrow {
        animation: none;
    }
    html { scroll-behavior: auto; }
}