/* ==========================================================================
   haskell.day v2 -- mid-century modern, broken-grid, sunset-warm
   Palette: #FFF5E8, #E86830, #D4A060, #3A3A3A, #8A8A8A, #F0E4D4, #3A8A8A
   Fonts: Josefin Sans (display), Poppins (body), JetBrains Mono (code)
   ========================================================================== */

:root {
    --bg-cream: #FFF5E8;
    --bg-cream-dark: #F0E4D4;
    --orange: #E86830;
    --gold: #D4A060;
    --charcoal: #3A3A3A;
    --mid-gray: #8A8A8A;
    --teal: #3A8A8A;

    --font-display: "Josefin Sans", "Inter", system-ui, sans-serif;
    --font-body: "Poppins", "Inter", system-ui, sans-serif;
    --font-mono: "JetBrains Mono", "Space Mono", ui-monospace, monospace;

    --rule: 1px solid var(--charcoal);
    --rule-thin: 1px solid var(--mid-gray);

    --shadow-rest: 0 2px 4px rgba(0, 0, 0, 0.10);
    --shadow-lift: 0 6px 14px rgba(0, 0, 0, 0.15);

    --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);

    --max: 1320px;
    --pad-x: clamp(20px, 5vw, 72px);
}

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

html { scroll-behavior: smooth; }

body {
    background: var(--bg-cream);
    color: var(--charcoal);
    font-family: var(--font-body);
    font-weight: 400;
    font-size: clamp(15px, 1.05vw, 17px);
    line-height: 1.8;
    overflow-x: hidden;
    position: relative;
    min-height: 100vh;
}

/* Subtle paper grain via repeating dots */
body::before {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    background-image:
        radial-gradient(circle at 20% 30%, rgba(58, 58, 58, 0.025) 0.5px, transparent 1px),
        radial-gradient(circle at 70% 60%, rgba(232, 104, 48, 0.018) 0.5px, transparent 1px);
    background-size: 7px 7px, 11px 11px;
    z-index: 0;
}

a {
    color: var(--teal);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color 200ms var(--ease-out), color 200ms var(--ease-out);
}
a:hover { color: var(--orange); border-bottom-color: var(--orange); }

/* ============== CORNER STARBURSTS (decorative, fixed) ============== */
.corner-star {
    position: fixed;
    width: 26px;
    height: 26px;
    z-index: 5;
    opacity: 0;
    transform: scale(0);
    transition: opacity 400ms var(--ease-spring), transform 400ms var(--ease-spring);
}
.corner-star.is-in {
    opacity: 1;
    transform: scale(1);
}
.corner-star--tl { top: 18px; left: 18px; }
.corner-star--tr { top: 18px; right: 18px; transition-delay: 100ms; }
.corner-star--bl { bottom: 18px; left: 18px; transition-delay: 200ms; }
.corner-star--br { bottom: 18px; right: 18px; transition-delay: 300ms; }
.corner-star.pulse { animation: starburst-pulse 300ms var(--ease-out); }

@keyframes starburst-pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.25); }
    100% { transform: scale(1); }
}

/* ============================ HERO ============================ */
.hero {
    position: relative;
    min-height: 100vh;
    padding: 0 var(--pad-x);
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 1fr auto 1fr;
    align-items: stretch;
    overflow: hidden;
    z-index: 1;
}

.hero-lambda {
    grid-column: 2 / 3;
    grid-row: 1 / 3;
    justify-self: end;
    align-self: start;
    width: clamp(220px, 30vw, 460px);
    height: clamp(240px, 33vw, 500px);
    margin-top: clamp(40px, 8vh, 96px);
    margin-right: clamp(0px, 4vw, 60px);
    position: relative;
}
.hero-lambda svg {
    width: 100%;
    height: 100%;
    overflow: visible;
}
#lambda-path {
    stroke-dasharray: 600;
    stroke-dashoffset: 600;
    transition: stroke-dashoffset 1500ms var(--ease-out), stroke 400ms ease 1500ms;
    stroke: rgba(232, 104, 48, 0.25);
}
.hero.is-in #lambda-path {
    stroke-dashoffset: 0;
    stroke: var(--orange);
}

.hero-rule {
    grid-column: 1 / 3;
    grid-row: 2 / 3;
    align-self: center;
    position: relative;
    width: 100%;
    margin: 0;
}
.hero-rule::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    height: 1px;
    background: var(--charcoal);
    width: 0;
    transition: width 800ms var(--ease-out) 600ms;
}
.hero.is-in .hero-rule::before { width: 100%; }
.hero-rule__label {
    display: inline-block;
    position: relative;
    background: var(--bg-cream);
    padding: 0 18px;
    margin-left: clamp(20px, 6vw, 90px);
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 12px;
    letter-spacing: 0.32em;
    text-transform: uppercase;
    color: var(--charcoal);
    opacity: 0;
    transition: opacity 500ms var(--ease-out) 1100ms;
}
.hero.is-in .hero-rule__label { opacity: 1; }

.hero-logotype {
    grid-column: 1 / 2;
    grid-row: 3 / 4;
    align-self: end;
    padding-bottom: clamp(40px, 8vh, 96px);
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 600ms var(--ease-out) 900ms, transform 600ms var(--ease-out) 900ms;
}
.hero.is-in .hero-logotype { opacity: 1; transform: translateY(0); }

.logotype {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(48px, 9vw, 132px);
    line-height: 0.92;
    letter-spacing: 0.02em;
    color: var(--charcoal);
}
.logotype__dot { color: var(--orange); }

.hero-meta {
    margin-top: 22px;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 14px;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 11px;
    letter-spacing: 0.28em;
    text-transform: uppercase;
    color: var(--mid-gray);
}
.hero-meta__pill {
    border: 1px solid var(--charcoal);
    padding: 5px 12px;
    color: var(--charcoal);
}
.hero-meta__sep { color: var(--gold); }

.hero-marginalia {
    position: absolute;
    top: 50%;
    right: clamp(12px, 2.5vw, 28px);
    transform: translateY(-50%) rotate(90deg);
    transform-origin: right center;
    display: flex;
    gap: 26px;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 10px;
    letter-spacing: 0.36em;
    text-transform: uppercase;
    color: var(--mid-gray);
    opacity: 0;
    transition: opacity 500ms var(--ease-out) 1300ms;
}
.hero.is-in .hero-marginalia { opacity: 1; }

.scroll-cue {
    position: absolute;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 10px;
    letter-spacing: 0.36em;
    text-transform: uppercase;
    color: var(--mid-gray);
    opacity: 0;
    transition: opacity 600ms var(--ease-out) 1500ms;
}
.hero.is-in .scroll-cue { opacity: 1; }
.scroll-cue__bar {
    width: 1px;
    height: 36px;
    background: var(--charcoal);
    animation: cue-bob 2.4s var(--ease-out) infinite;
    transform-origin: top center;
}
@keyframes cue-bob {
    0%, 100% { transform: scaleY(1); opacity: 0.8; }
    50% { transform: scaleY(0.55); opacity: 0.3; }
}

/* =================== SECTION HEADERS (shared) =================== */
.section-header {
    max-width: var(--max);
    margin: 0 auto;
    padding: clamp(80px, 14vh, 160px) var(--pad-x) clamp(48px, 8vh, 88px);
}
.section-header--centered {
    text-align: center;
    max-width: 760px;
}
.section-eyebrow {
    display: inline-block;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 11px;
    letter-spacing: 0.42em;
    text-transform: uppercase;
    color: var(--orange);
    padding-bottom: 8px;
    border-bottom: 1px solid var(--orange);
    margin-bottom: 20px;
}
.section-title {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: clamp(28px, 5vw, 56px);
    letter-spacing: 0.02em;
    line-height: 1.1;
    color: var(--charcoal);
}
.section-lede {
    margin-top: 18px;
    font-size: clamp(15px, 1.1vw, 18px);
    color: var(--mid-gray);
    line-height: 1.75;
}

/* =================== CONCEPTS (broken grid) =================== */
.concepts {
    position: relative;
    z-index: 1;
}
.broken-grid {
    max-width: var(--max);
    margin: 0 auto;
    padding: 0 var(--pad-x) clamp(80px, 12vh, 140px);
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: 28px;
    position: relative;
}
.block {
    background: var(--bg-cream-dark);
    border: 1px solid rgba(58, 58, 58, 0.12);
    padding: 32px 30px 30px;
    box-shadow: var(--shadow-rest);
    transition: transform 220ms var(--ease-out), box-shadow 220ms var(--ease-out);
    position: relative;
}
.block:hover { transform: translateY(-4px); box-shadow: var(--shadow-lift); }

.block--large  { grid-column: 1 / span 7; margin-left: -40px; }
.block--medium { grid-column: 8 / span 5; margin-top: -30px; }
.block--small  { grid-column: 6 / span 5; margin-top: -22px; transform: translateX(20px); }
.block--small:hover { transform: translateX(20px) translateY(-4px); }

.block-marker {
    position: absolute;
    left: -2px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--orange);
}
.block-marker--top {
    left: 0;
    top: -2px;
    width: 100%;
    height: 2px;
}
.block-marker--right {
    left: auto;
    right: -2px;
    top: 0;
    bottom: 0;
    width: 2px;
}

.block-num {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 12px;
    letter-spacing: 0.32em;
    color: var(--gold);
}
.block-title {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: clamp(22px, 2.4vw, 32px);
    letter-spacing: 0.02em;
    line-height: 1.15;
    margin-top: 6px;
    color: var(--charcoal);
}
.block-illustration {
    margin: 22px 0 18px;
    background: var(--bg-cream);
    border: 1px solid rgba(58, 58, 58, 0.15);
    padding: 14px;
}
.block-illustration svg { display: block; width: 100%; height: auto; }
.block-body { color: var(--charcoal); font-size: 15px; line-height: 1.75; }
.block-sig {
    display: inline-block;
    margin-top: 18px;
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--teal);
    background: var(--bg-cream);
    padding: 6px 12px;
    border: 1px solid rgba(58, 138, 138, 0.4);
}

/* draw-path animation */
.draw-path path,
.draw-path line,
.draw-path ellipse,
.draw-path polygon {
    stroke-dasharray: 400;
    stroke-dashoffset: 400;
    transition: stroke-dashoffset 800ms var(--ease-out);
}
.reveal.is-in .draw-path path,
.reveal.is-in .draw-path line,
.reveal.is-in .draw-path ellipse,
.reveal.is-in .draw-path polygon {
    stroke-dashoffset: 0;
}

/* Reveal base states */
.reveal {
    opacity: 0;
    transition: opacity 600ms var(--ease-out), transform 600ms var(--ease-out);
}
.reveal[data-reveal="left"]  { transform: translateX(-60px); }
.reveal[data-reveal="right"] { transform: translateX(40px); }
.reveal[data-reveal="up"]    { transform: translateY(30px); }
.reveal.is-in {
    opacity: 1;
    transform: translate(0, 0);
}
.block--large.reveal[data-reveal="left"].is-in { transform: translateX(0); }
.block--small.reveal[data-reveal="right"].is-in { transform: translateX(20px); }

/* ===================== POSTER (CODE) ===================== */
.poster {
    position: relative;
    background: linear-gradient(135deg, var(--orange) 0%, var(--gold) 100%);
    padding: clamp(90px, 14vh, 160px) var(--pad-x);
    z-index: 1;
}
.poster::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(circle at 18% 22%, rgba(255, 245, 232, 0.10) 1px, transparent 2px),
        radial-gradient(circle at 78% 70%, rgba(255, 245, 232, 0.08) 1px, transparent 2px);
    background-size: 40px 40px, 60px 60px;
    pointer-events: none;
}
.poster-card {
    position: relative;
    max-width: 760px;
    margin: 0 auto;
    transition: transform 220ms var(--ease-out), box-shadow 220ms var(--ease-out);
}
.poster-card:hover { transform: translateY(-6px); }

.poster-frame {
    position: relative;
    background: var(--bg-cream);
    border: 1px solid var(--charcoal);
    box-shadow: 0 0 0 5px var(--bg-cream), 0 0 0 6px var(--charcoal), 0 12px 28px rgba(0, 0, 0, 0.25);
    padding: clamp(28px, 4vw, 48px);
}

.poster-eyebrow {
    display: inline-block;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 11px;
    letter-spacing: 0.42em;
    color: var(--orange);
    padding-bottom: 6px;
    border-bottom: 1px solid var(--orange);
    margin-bottom: 14px;
}
.poster-burst {
    position: absolute;
    top: 22px;
    right: 22px;
    width: 28px;
    height: 28px;
}
.poster-burst g { stroke: var(--orange); }
.poster-burst circle { fill: var(--orange); }

.poster-title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(40px, 6vw, 80px);
    letter-spacing: 0.04em;
    line-height: 0.95;
    color: var(--charcoal);
    text-transform: lowercase;
}
.poster-billing {
    margin-top: 14px;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 12px;
    letter-spacing: 0.32em;
    text-transform: uppercase;
    color: var(--mid-gray);
}

.poster-code {
    margin-top: 26px;
    background: var(--charcoal);
    color: var(--bg-cream);
    padding: 22px 24px;
    border: 1px solid var(--charcoal);
    box-shadow: inset 0 0 0 4px var(--charcoal), inset 0 0 0 5px var(--bg-cream);
    overflow-x: auto;
}
.poster-code pre { margin: 0; }
.poster-code code {
    font-family: var(--font-mono);
    font-size: 13.5px;
    line-height: 1.85;
    color: var(--bg-cream);
    white-space: pre;
}
.poster-code .ln { display: block; }
.poster-code .c-tp { color: var(--gold); }
.poster-code .c-cls { color: var(--orange); }
.poster-code .c-kw { color: #6FBABA; }

.poster-credits {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 10px 18px;
    margin-top: 22px;
    padding-top: 18px;
    border-top: 1px solid rgba(58, 58, 58, 0.6);
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 10px;
    letter-spacing: 0.32em;
    text-transform: uppercase;
    color: var(--mid-gray);
}

/* ===================== TIMELINE ===================== */
.timeline {
    position: relative;
    background: var(--bg-cream);
    z-index: 1;
}
.timeline-rail {
    list-style: none;
    max-width: var(--max);
    margin: 0 auto;
    padding: 0 var(--pad-x) clamp(80px, 12vh, 140px);
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 28px;
    position: relative;
}
.timeline-rail::before {
    content: "";
    position: absolute;
    top: 56px;
    left: var(--pad-x);
    right: var(--pad-x);
    height: 1px;
    background: var(--mid-gray);
}

.timeline-item {
    grid-column: span 1;
    position: relative;
    padding-top: 80px;
    cursor: default;
    transition: transform 220ms var(--ease-out);
}
.timeline-item:hover { transform: translateY(-4px); }
.timeline-item:nth-child(even) { padding-top: 96px; }

.timeline-marker {
    position: absolute;
    top: 44px;
    left: 0;
    width: 24px;
    height: 24px;
    transition: transform 220ms var(--ease-out);
}
.timeline-marker--circle {
    background: var(--orange);
    border-radius: 50%;
    box-shadow: 0 0 0 3px var(--bg-cream), 0 0 0 4px var(--orange);
}
.timeline-marker--triangle {
    width: 0;
    height: 0;
    background: transparent;
    border-left: 12px solid transparent;
    border-right: 12px solid transparent;
    border-bottom: 22px solid var(--gold);
    top: 46px;
}
.timeline-marker--diamond {
    background: var(--charcoal);
    transform: rotate(45deg);
    width: 16px;
    height: 16px;
    top: 48px;
    left: 4px;
}
.timeline-item:hover .timeline-marker--circle { transform: scale(1.2); }
.timeline-item:hover .timeline-marker--triangle { transform: scale(1.15); }
.timeline-item:hover .timeline-marker--diamond { transform: rotate(45deg) scale(1.15); }

.timeline-year {
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 14px;
    color: var(--orange);
    letter-spacing: 0.05em;
}
.timeline-title {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 18px;
    letter-spacing: 0.02em;
    margin-top: 6px;
    color: var(--charcoal);
}
.timeline-body {
    margin-top: 8px;
    font-size: 14px;
    line-height: 1.7;
    color: var(--mid-gray);
}

/* ===================== AXIOMS ===================== */
.axioms {
    position: relative;
    background: var(--bg-cream-dark);
    z-index: 1;
}
.axiom-list {
    list-style: none;
    max-width: 880px;
    margin: 0 auto;
    padding: 0 var(--pad-x) clamp(90px, 14vh, 160px);
    display: flex;
    flex-direction: column;
    gap: 0;
}
.axiom {
    display: grid;
    grid-template-columns: 64px 1fr;
    gap: 24px;
    align-items: baseline;
    padding: 22px 0;
    border-bottom: 1px solid rgba(58, 58, 58, 0.18);
    transition: background 220ms var(--ease-out), padding 220ms var(--ease-out);
}
.axiom:first-child { border-top: 1px solid rgba(58, 58, 58, 0.18); }
.axiom:hover {
    background: rgba(232, 104, 48, 0.04);
    padding-left: 18px;
    padding-right: 18px;
}
.axiom-num {
    font-family: var(--font-mono);
    font-size: 14px;
    color: var(--orange);
    letter-spacing: 0.05em;
}
.axiom-text {
    font-family: var(--font-body);
    font-size: clamp(16px, 1.4vw, 20px);
    line-height: 1.7;
    color: var(--charcoal);
}
.axiom-text code {
    font-family: var(--font-mono);
    font-size: 0.86em;
    color: var(--teal);
    background: var(--bg-cream);
    padding: 2px 6px;
    border: 1px solid rgba(58, 138, 138, 0.4);
}

/* ===================== FOOTER ===================== */
.site-footer {
    position: relative;
    background: var(--bg-cream);
    padding: 56px var(--pad-x) 64px;
    text-align: center;
    z-index: 1;
}
.footer-rule {
    border: 0;
    border-top: 1px solid var(--charcoal);
    max-width: 880px;
    margin: 0 auto;
}
.footer-nav {
    padding: 22px 0;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 16px;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 11px;
    letter-spacing: 0.42em;
    text-transform: uppercase;
}
.footer-nav a { color: var(--charcoal); border-bottom: 1px solid transparent; }
.footer-nav a:hover { color: var(--orange); border-bottom-color: var(--orange); }
.footer-dot { color: var(--gold); }

.footer-fineprint {
    margin-top: 18px;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 10px;
    letter-spacing: 0.36em;
    text-transform: uppercase;
    color: var(--mid-gray);
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
}
.footer-fineprint__sep { color: var(--gold); }

/* ===================== RESPONSIVE ===================== */
@media (max-width: 960px) {
    .hero {
        grid-template-columns: 1fr;
        grid-template-rows: auto auto auto;
        min-height: auto;
        padding-top: 72px;
        padding-bottom: 72px;
        gap: 30px;
    }
    .hero-lambda {
        grid-column: 1 / 2;
        grid-row: 1 / 2;
        justify-self: center;
        align-self: auto;
        margin: 0;
        width: 60vw;
        height: 60vw;
    }
    .hero-rule { grid-column: 1 / 2; grid-row: 2 / 3; }
    .hero-logotype { grid-column: 1 / 2; grid-row: 3 / 4; padding-bottom: 0; }
    .hero-marginalia { display: none; }

    .broken-grid {
        grid-template-columns: 1fr;
        gap: 36px;
    }
    .block--large,
    .block--medium,
    .block--small {
        grid-column: 1 / -1;
        margin: 0;
        transform: none;
    }
    .block--small.reveal[data-reveal="right"].is-in { transform: none; }
    .block--small:hover { transform: translateY(-4px); }

    .timeline-rail {
        grid-template-columns: 1fr;
        gap: 18px;
    }
    .timeline-rail::before { display: none; }
    .timeline-item,
    .timeline-item:nth-child(even) {
        padding-top: 18px;
        padding-left: 40px;
    }
    .timeline-marker { top: 22px; }
    .timeline-marker--circle { left: 0; }
    .timeline-marker--triangle { left: 0; }
    .timeline-marker--diamond { left: 4px; top: 24px; }
}

@media (max-width: 520px) {
    .corner-star { width: 18px; height: 18px; }
    .footer-nav { gap: 10px; font-size: 10px; letter-spacing: 0.3em; }
    .axiom { grid-template-columns: 48px 1fr; gap: 14px; }
}