/* =====================================================================
   plotgrapher.com -- a graphing instrument for narrative
   Aesthetic: generative meets editorial. Story arcs as data viz.
   ===================================================================== */

:root {
    --paper:      #fafafa; /* primary background */
    --paper-warm: #f5f0e8; /* alternating section warmth */
    --ink:        #1a1a1a; /* primary text */
    --tension:    #e63946; /* the narrative arc, climax markers */
    --annotation: #457b9d; /* labels, links */
    --grid:       #e0e0e0; /* axes, grid lines */
    --resolution: #2a9d8f; /* secondary arc, resolution markers */
    --footnote:   #888888; /* secondary text */

    --display: "Cormorant Garamond", "Cormorant", Georgia, serif;
    --body:    "Source Serif 4", "Source Serif Pro", Georgia, serif;
    --label:   "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

    --max-content: 1240px;
    --gutter: clamp(1.25rem, 4vw, 3rem);
    --y-axis-x:    5vw;
    --x-axis-y:    10vh;
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
}

body {
    background: var(--paper);
    color: var(--ink);
    font-family: var(--body);
    font-size: 1rem;
    line-height: 1.8;
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
    position: relative;
}

img, svg {
    display: block;
    max-width: 100%;
}

p {
    margin: 0 0 1rem 0;
}

em {
    font-style: italic;
}

/* =====================================================================
   PERSISTENT COORDINATE SYSTEM (background graph framework)
   ===================================================================== */

.coord-system {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 1;
}

.axis {
    position: absolute;
    background: var(--grid);
}

.axis-x {
    bottom: var(--x-axis-y);
    left: 0;
    right: 0;
    height: 1px;
}

.axis-y {
    left: var(--y-axis-x);
    top: 0;
    bottom: 0;
    width: 1px;
}

.axis-label {
    position: absolute;
    font-family: var(--label);
    font-size: 0.7rem;
    font-weight: 500;
    color: var(--footnote);
    letter-spacing: 0.08em;
    text-transform: lowercase;
}

.axis-label-x {
    bottom: calc(var(--x-axis-y) - 1.6rem);
    right: 1.5vw;
}

.axis-label-y {
    top: 1.4rem;
    left: calc(var(--y-axis-x) + 0.5rem);
    writing-mode: vertical-rl;
    transform: rotate(180deg);
    transform-origin: center;
}

.grid-tick {
    position: absolute;
    font-family: var(--label);
    font-size: 0.65rem;
    font-weight: 500;
    color: var(--footnote);
    letter-spacing: 0.06em;
    opacity: 0.85;
}

.grid-tick::before {
    content: "";
    position: absolute;
    background: var(--grid);
}

.grid-tick-x {
    bottom: var(--x-axis-y);
    transform: translateX(-50%);
    padding-top: 0.45rem;
}
.grid-tick-x::before {
    width: 1px;
    height: 6px;
    top: -3px;
    left: 50%;
    transform: translateX(-50%);
}
.grid-tick-x span {
    display: block;
    text-align: center;
    font-style: italic;
}

.grid-tick-y {
    left: var(--y-axis-x);
    transform: translateY(50%);
    padding-right: 0.45rem;
    text-align: right;
}
.grid-tick-y::before {
    width: 6px;
    height: 1px;
    top: 50%;
    right: -3px;
    transform: translateY(-50%);
}
.grid-tick-y span {
    display: inline-block;
    margin-right: 0.55rem;
}

/* =====================================================================
   HERO -- The Narrative Arc
   ===================================================================== */

.hero {
    position: relative;
    min-height: 100vh;
    width: 100%;
    z-index: 2;
    padding: 0 var(--gutter);
    overflow: hidden;
}

.hero-arc {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    pointer-events: none;
}

.arc-primary {
    stroke-dasharray: 1500;
    stroke-dashoffset: 1500;
    animation: drawArc 2s ease-out 0.3s forwards;
    stroke-linecap: round;
}

.arc-secondary {
    stroke-dasharray: 4 6;
    opacity: 0;
    animation: fadeInArc 1.4s ease-out 1.6s forwards;
}

.arc-point {
    opacity: 0;
    transform-origin: center;
    transform-box: fill-box;
    animation: popPoint 0.45s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

.arc-point:nth-of-type(1) { animation-delay: 1.10s; }
.arc-point:nth-of-type(2) { animation-delay: 1.30s; }
.arc-point:nth-of-type(3) { animation-delay: 1.55s; }
.arc-point:nth-of-type(4) { animation-delay: 1.80s; }
.arc-point:nth-of-type(5) { animation-delay: 2.05s; }
.arc-point:nth-of-type(6) { animation-delay: 2.30s; }

@keyframes drawArc {
    to {
        stroke-dashoffset: 0;
    }
}

@keyframes fadeInArc {
    to {
        opacity: 0.55;
    }
}

@keyframes popPoint {
    0%   { opacity: 0; transform: scale(0.2); }
    60%  { opacity: 1; transform: scale(1.35); }
    100% { opacity: 1; transform: scale(1); }
}

.hero-text {
    position: relative;
    z-index: 3;
    max-width: var(--max-content);
    margin: 0 auto;
    padding-top: clamp(7rem, 16vh, 13rem);
    padding-left: clamp(0rem, 6vw, 6rem);
    pointer-events: none;
}

.hero-eyebrow {
    font-family: var(--label);
    font-size: 0.72rem;
    letter-spacing: 0.32em;
    text-transform: uppercase;
    color: var(--annotation);
    margin-bottom: 1.5rem;
    padding-left: 2px;
    opacity: 0;
    animation: fadeUp 0.8s ease-out 0.1s forwards;
}

.hero-title {
    font-family: var(--display);
    font-weight: 600;
    font-size: clamp(2.6rem, 7vw, 5.8rem);
    line-height: 1.04;
    letter-spacing: -0.012em;
    color: var(--ink);
    margin: 0 0 1.5rem 0;
    opacity: 0;
    animation: fadeUp 1s ease-out 0.35s forwards;
}

.hero-title .dot {
    color: var(--tension);
    font-weight: 700;
}

.hero-subtitle {
    font-family: var(--body);
    font-size: clamp(1rem, 1.4vw, 1.18rem);
    line-height: 1.7;
    color: var(--ink);
    max-width: 32rem;
    margin: 0 0 2rem 0;
    opacity: 0;
    animation: fadeUp 1s ease-out 0.6s forwards;
}

.hero-coord {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.45rem 0.95rem;
    border: 1px solid var(--grid);
    border-radius: 999px;
    font-family: var(--label);
    font-size: 0.72rem;
    font-weight: 500;
    color: var(--annotation);
    letter-spacing: 0.06em;
    background: rgba(250, 250, 250, 0.7);
    backdrop-filter: blur(2px);
    opacity: 0;
    animation: fadeUp 1s ease-out 0.85s forwards;
}

.coord-pair em {
    font-style: italic;
}

.coord-sep {
    color: var(--grid);
}

@keyframes fadeUp {
    from { opacity: 0; transform: translateY(14px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* Annotation labels, positioned over the hero arc */

.annotations {
    position: absolute;
    inset: 0;
    z-index: 2;
    pointer-events: none;
}

.annotation {
    position: absolute;
    max-width: 12rem;
    font-family: var(--label);
    font-size: 0.7rem;
    line-height: 1.5;
    color: var(--footnote);
    letter-spacing: 0.02em;
    opacity: 0;
    animation: fadeIn 0.7s ease-out forwards;
    transform: translateY(-50%);
}

.annotation::before {
    content: "";
    position: absolute;
    width: 1.2rem;
    height: 1px;
    background: var(--annotation);
    top: 0.55rem;
    left: -1.4rem;
    opacity: 0.6;
}

.annotation:nth-child(1) { animation-delay: 1.4s; }
.annotation:nth-child(2) { animation-delay: 1.6s; }
.annotation:nth-child(3) { animation-delay: 1.8s; }
.annotation:nth-child(4) { animation-delay: 2.0s; }
.annotation:nth-child(5) { animation-delay: 2.2s; }
.annotation:nth-child(6) { animation-delay: 2.4s; }

.anno-num {
    display: inline-block;
    font-family: var(--label);
    font-weight: 600;
    font-size: 0.66rem;
    letter-spacing: 0.14em;
    color: var(--tension);
    margin-bottom: 0.3rem;
}

.anno-text {
    display: block;
    color: var(--ink);
    font-size: 0.74rem;
    font-weight: 500;
}

.annotation-peak .anno-num {
    color: var(--tension);
    font-weight: 700;
}

.annotation-peak::after {
    content: "climax";
    position: absolute;
    top: -1.1rem;
    left: 0;
    font-family: var(--display);
    font-style: italic;
    font-size: 0.85rem;
    color: var(--tension);
    font-weight: 500;
    letter-spacing: 0.02em;
}

@keyframes fadeIn {
    to { opacity: 1; }
}

/* =====================================================================
   GENERIC SECTION FRAMEWORK
   ===================================================================== */

.section {
    position: relative;
    z-index: 2;
    padding: clamp(5rem, 10vh, 9rem) var(--gutter) clamp(5rem, 10vh, 8rem);
}

.section-meta {
    max-width: var(--max-content);
    margin: 0 auto 2.5rem auto;
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    font-family: var(--label);
    font-size: 0.72rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    color: var(--annotation);
    border-bottom: 1px dashed var(--grid);
    padding-bottom: 0.6rem;
}

.section-num {
    color: var(--footnote);
    font-style: italic;
    font-family: var(--display);
    font-size: 0.95rem;
    letter-spacing: 0.04em;
}

.section-coord {
    font-feature-settings: "tnum" 1;
}

.section-grid {
    max-width: var(--max-content);
    margin: 0 auto;
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr);
    gap: clamp(2.5rem, 5vw, 5rem);
    align-items: start;
}

.section-grid-single {
    grid-template-columns: minmax(0, 1fr);
    gap: 2.5rem;
}

.section-lead {
    position: relative;
    padding-left: 1rem;
    border-left: 2px solid var(--tension);
}

.section-title {
    font-family: var(--display);
    font-weight: 600;
    font-size: clamp(1.8rem, 4vw, 3.2rem);
    line-height: 1.08;
    letter-spacing: -0.01em;
    color: var(--ink);
    margin: 0 0 1rem 0;
}

.section-deck {
    font-family: var(--body);
    font-size: 1.02rem;
    line-height: 1.75;
    color: var(--ink);
    margin: 0;
    max-width: 28rem;
}

/* =====================================================================
   SECTION I -- The Shape of Stories (alternating warm paper)
   ===================================================================== */

.section-shapes {
    background: var(--paper-warm);
}

.section-shapes::before {
    /* a faint tick marker on the y-axis to anchor this section visually */
    content: "";
    position: absolute;
    left: var(--y-axis-x);
    top: 0;
    width: 10px;
    height: 1px;
    background: var(--annotation);
    transform: translateX(-50%);
}

.shape-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.6rem;
    margin: 0;
}

.shape-card {
    background: var(--paper);
    border: 1px solid var(--grid);
    padding: 1.2rem 1.2rem 1rem 1.2rem;
    position: relative;
    transition: transform 0.4s ease, border-color 0.4s ease, box-shadow 0.4s ease;
}

.shape-card:hover {
    transform: translateY(-2px);
    border-color: var(--annotation);
    box-shadow: 0 6px 18px -10px rgba(26, 26, 26, 0.18);
}

.shape-svg {
    width: 100%;
    height: auto;
    display: block;
    margin-bottom: 0.85rem;
}

.shape-axis {
    stroke: var(--grid);
    stroke-width: 1;
}

.shape-path {
    stroke: var(--tension);
    stroke-width: 1.6;
    fill: none;
    stroke-linecap: round;
    stroke-linejoin: round;
    stroke-dasharray: 600;
    stroke-dashoffset: 600;
    transition: stroke-dashoffset 1.6s ease-out;
}

.shape-card.in-view .shape-path {
    stroke-dashoffset: 0;
}

.shape-card figcaption {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.shape-name {
    font-family: var(--display);
    font-weight: 600;
    font-size: 1.15rem;
    color: var(--ink);
    letter-spacing: 0.005em;
}

.shape-note {
    font-family: var(--label);
    font-size: 0.74rem;
    color: var(--footnote);
    letter-spacing: 0.04em;
    font-weight: 500;
}

/* =====================================================================
   SECTION II -- Method
   ===================================================================== */

.section-method {
    background: var(--paper);
}

.method-list {
    list-style: none;
    counter-reset: method;
    margin: 0;
    padding: 0;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.8rem 2.2rem;
}

.method-list li {
    position: relative;
    padding: 1.2rem 1.4rem 1.4rem 1.4rem;
    border: 1px solid var(--grid);
    background: var(--paper);
    transition: border-color 0.4s ease, transform 0.4s ease;
}

.method-list li::after {
    /* a tiny coordinate point in the corner of each method card */
    content: "";
    position: absolute;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--annotation);
    top: -3px;
    left: -3px;
}

.method-list li:hover {
    border-color: var(--annotation);
    transform: translateY(-2px);
}

.method-tag {
    display: inline-block;
    font-family: var(--label);
    font-size: 0.66rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--tension);
    font-weight: 600;
    margin-bottom: 0.4rem;
}

.method-head {
    font-family: var(--display);
    font-size: 1.55rem;
    font-weight: 600;
    color: var(--ink);
    margin: 0 0 0.55rem 0;
    line-height: 1.12;
}

.method-list li p {
    font-size: 0.95rem;
    line-height: 1.7;
    color: var(--ink);
    margin: 0;
}

.method-list li p em {
    font-style: italic;
    color: var(--annotation);
    font-family: var(--display);
    font-size: 1.05rem;
    letter-spacing: 0.01em;
}

/* =====================================================================
   SECTION III -- Marginalia / Quotations
   ===================================================================== */

.section-quotes {
    background: var(--paper-warm);
}

.quote-stack {
    display: flex;
    flex-direction: column;
    gap: 2.4rem;
    max-width: 48rem;
    margin: 0 auto;
}

.lit-quote {
    margin: 0;
    padding: 0.4rem 0 0.4rem 1.6rem;
    border-left: 2px solid var(--tension);
    text-indent: -1.2rem;
    padding-left: 2.8rem; /* compensates for hanging indent */
}

.lit-quote p {
    font-family: var(--display);
    font-style: italic;
    font-size: clamp(1.15rem, 1.6vw, 1.5rem);
    line-height: 1.5;
    color: var(--ink);
    font-weight: 500;
    margin: 0 0 0.7rem 0;
    text-indent: -1.2rem;
}

.lit-quote p::first-letter {
    color: var(--tension);
    font-size: 1.15em;
    font-weight: 600;
}

.lit-quote cite {
    font-style: normal;
    font-family: var(--label);
    font-size: 0.78rem;
    color: var(--footnote);
    letter-spacing: 0.04em;
    text-indent: 0;
    display: block;
    margin-left: 1.2rem;
}

.lit-quote cite em {
    font-style: italic;
    font-family: var(--display);
    color: var(--annotation);
    font-size: 0.95rem;
    letter-spacing: 0.005em;
}

/* =====================================================================
   SECTION IV -- Comparative Plot
   ===================================================================== */

.section-compare {
    background: var(--paper);
}

.compare-graph {
    width: 100%;
    background: var(--paper-warm);
    border: 1px solid var(--grid);
    padding: 1.5rem 1.5rem 1rem 1.5rem;
    position: relative;
}

.compare-svg {
    width: 100%;
    height: auto;
    display: block;
}

.compare-axis {
    stroke: var(--grid);
    stroke-width: 1;
}

.compare-tick {
    font-family: var(--label);
    font-size: 9px;
    fill: var(--footnote);
    letter-spacing: 0.06em;
}

.compare-line {
    fill: none;
    stroke-width: 1.8;
    stroke-linecap: round;
    stroke-linejoin: round;
    stroke-dasharray: 1500;
    stroke-dashoffset: 1500;
    transition: stroke-dashoffset 2.2s ease-out;
}

.compare-line-a { stroke: var(--tension); }
.compare-line-b { stroke: var(--resolution); stroke-dasharray: 6 4 1500; }

.compare-graph.in-view .compare-line {
    stroke-dashoffset: 0;
}

.compare-graph.in-view .compare-line-b {
    stroke-dasharray: 6 4;
}

.compare-point {
    transition: r 0.3s ease;
}

.compare-point-a { fill: var(--tension); }
.compare-point-b { fill: var(--resolution); }

.compare-label {
    font-family: var(--label);
    font-size: 9px;
    letter-spacing: 0.06em;
    font-weight: 500;
}
.compare-label-a { fill: var(--tension); }
.compare-label-b { fill: var(--resolution); }

.compare-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 1.4rem;
    margin-top: 1rem;
    padding-top: 0.85rem;
    border-top: 1px dashed var(--grid);
    font-family: var(--label);
    font-size: 0.74rem;
    color: var(--footnote);
    letter-spacing: 0.04em;
}

.legend-item {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.legend-swatch {
    display: inline-block;
    width: 1.2rem;
    height: 2px;
}

.legend-a .legend-swatch { background: var(--tension); }
.legend-b .legend-swatch {
    background: linear-gradient(to right, var(--resolution) 50%, transparent 50%);
    background-size: 6px 2px;
    background-repeat: repeat-x;
    height: 2px;
}

/* =====================================================================
   FOOTER -- Bibliography
   ===================================================================== */

.biblio {
    position: relative;
    z-index: 2;
    padding: clamp(4rem, 8vh, 7rem) var(--gutter) clamp(3rem, 6vh, 5rem);
    background: var(--paper-warm);
    border-top: 1px solid var(--grid);
}

.biblio .section-meta {
    margin-bottom: 2rem;
}

.biblio-title {
    font-family: var(--display);
    font-size: clamp(1.6rem, 3vw, 2.4rem);
    font-weight: 600;
    color: var(--ink);
    margin: 0 0 1.5rem 0;
    max-width: var(--max-content);
    margin-left: auto;
    margin-right: auto;
    border-bottom: 1px solid var(--grid);
    padding-bottom: 0.8rem;
    letter-spacing: -0.005em;
}

.biblio-list {
    list-style: none;
    margin: 0 auto;
    padding: 0;
    max-width: var(--max-content);
    columns: 1;
}

.biblio-entry {
    font-family: var(--body);
    font-size: 0.92rem;
    line-height: 1.65;
    color: var(--ink);
    padding-left: 2rem;
    text-indent: -2rem; /* hanging indent, scholarly style */
    margin-bottom: 0.85rem;
    break-inside: avoid;
}

.biblio-entry em {
    font-style: italic;
    color: var(--annotation);
    font-family: var(--display);
    font-size: 1.02rem;
}

.colophon {
    max-width: var(--max-content);
    margin: 2.5rem auto 0 auto;
    padding-top: 1.4rem;
    border-top: 1px dashed var(--grid);
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
    font-family: var(--label);
    font-size: 0.7rem;
    letter-spacing: 0.08em;
    color: var(--footnote);
    text-transform: lowercase;
}

.colophon-sep {
    color: var(--grid);
}

/* =====================================================================
   IN-VIEW REVEAL TRANSITIONS (driven by IntersectionObserver in JS)
   ===================================================================== */

.section,
.section-lead,
.method-list li,
.shape-card,
.lit-quote,
.biblio-entry,
.compare-graph {
    --reveal-delay: 0s;
}

.reveal {
    opacity: 0;
    transform: translateY(18px);
    transition:
        opacity 0.8s ease-out var(--reveal-delay),
        transform 0.8s ease-out var(--reveal-delay);
}

.reveal.in-view {
    opacity: 1;
    transform: translateY(0);
}

/* =====================================================================
   RESPONSIVE
   ===================================================================== */

@media (max-width: 880px) {
    .section-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    .method-list {
        grid-template-columns: 1fr;
    }
    .shape-grid {
        grid-template-columns: 1fr;
    }
    .annotation {
        display: none;
    }
    .hero-text {
        padding-top: clamp(5rem, 12vh, 9rem);
        padding-left: 0;
    }
    .axis-label-x {
        right: 1rem;
    }
}

@media (max-width: 560px) {
    :root {
        --y-axis-x: 8vw;
    }
    .section-meta {
        flex-direction: column;
        gap: 0.4rem;
    }
    .lit-quote {
        padding-left: 1.6rem;
        text-indent: -0.6rem;
    }
    .lit-quote p {
        text-indent: -0.6rem;
    }
    .biblio-entry {
        padding-left: 1.4rem;
        text-indent: -1.4rem;
    }
}

/* =====================================================================
   PRINT (scholarly)
   ===================================================================== */

@media print {
    .coord-system,
    .hero-arc,
    .annotations {
        display: none;
    }
    body {
        background: white;
        color: black;
    }
}