/* =====================================================================
   rironbusou.net  --  styles.css
   Treatise in eight propositions. Nocturnal study atmosphere.
   ===================================================================== */

:root {
    --thesis-indigo: #1b1b2f;
    --parchment:     #e8e4d9;
    --rhetoric:      #c9463d;
    --amber:         #d4a24e;
    --slate:         #3a506b;
    --logic-blue:    #5c7a99;
    --abyss:         #0f0f1a;
    --bright-parch:  #f0ece2;

    --font-display: "Playfair Display", "Times New Roman", serif;
    --font-body:    "Source Serif 4", Georgia, serif;
    --font-accent:  "Bebas Neue", Impact, sans-serif;
    --font-anno:    "Caveat", "Comic Sans MS", cursive;

    --col-index-w: 40%;
    --col-prop-w:  60%;

    --easeOutQuart: cubic-bezier(0.25, 1, 0.5, 1);
    --easeOutBounce: cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html, body {
    background: var(--thesis-indigo);
    color: var(--parchment);
    font-family: var(--font-body);
    font-size: 18px;
    line-height: 1.8;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

body {
    background:
        radial-gradient(1200px 700px at 80% -10%, rgba(212,162,78,0.05), transparent 60%),
        radial-gradient(900px 600px at -10% 30%, rgba(92,122,153,0.05), transparent 60%),
        var(--thesis-indigo);
    min-height: 100vh;
    position: relative;
}

/* subtle grain */
body::before {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    opacity: 0.06;
    z-index: 1;
    background-image:
        repeating-linear-gradient(0deg, rgba(232,228,217,0.4) 0 1px, transparent 1px 3px),
        repeating-linear-gradient(90deg, rgba(232,228,217,0.4) 0 1px, transparent 1px 3px);
    mix-blend-mode: overlay;
}

a { color: var(--logic-blue); text-decoration: none; border-bottom: 1px dotted var(--logic-blue); }
a:hover { color: var(--amber); border-color: var(--amber); }

/* =====================================================================
   HERO  --  full-viewport kinetic typography
   ===================================================================== */
.hero {
    position: relative;
    min-height: 100vh;
    width: 100%;
    background: var(--thesis-indigo);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    z-index: 2;
}

.hero-inner {
    position: relative;
    width: 92%;
    max-width: 1500px;
    text-align: center;
    padding: 6vh 4vw;
}

.hero-line {
    position: absolute;
    left: 0;
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--slate) 20%, var(--slate) 80%, transparent);
    transform: scaleX(0);
    transform-origin: left center;
    transition: transform 1.4s var(--easeOutQuart) 1.6s;
}
.hero-line.top    { top: 0; }
.hero-line.bottom { bottom: 0; transform-origin: right center; }
.hero.is-on .hero-line { transform: scaleX(1); }

.hero-display {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0;
    line-height: 0.9;
    margin: 1vh 0;
}

.hero-kanji {
    display: flex;
    justify-content: center;
    overflow: hidden;
    padding: 0.05em 0;
}

.hero-kanji.riron {
    font-family: var(--font-display);
    font-weight: 900;
    font-size: 12vw;
    color: var(--parchment);
    letter-spacing: 0.04em;
}

.hero-kanji.busou {
    font-family: var(--font-accent);
    font-size: 15vw;
    color: var(--rhetoric);
    letter-spacing: 0.02em;
    margin-top: -1vw;
}

.hero-kanji .ch {
    display: inline-block;
    opacity: 0;
    transform: translateX(-100px);
    transition: transform 0.5s var(--easeOutQuart), opacity 0.5s var(--easeOutQuart);
}

.hero-kanji.busou .ch {
    transform: translateY(-60px);
    transition: transform 0.5s var(--easeOutBounce), opacity 0.5s var(--easeOutQuart);
}

.hero.is-on .hero-kanji .ch {
    opacity: 1;
    transform: translate(0,0);
}

.hero-rule {
    margin: 2.4vh auto 1.6vh;
    width: 60%;
    height: 1.5px;
    position: relative;
}
.hero-rule-line {
    display: block;
    width: 0;
    height: 100%;
    background: linear-gradient(90deg, transparent, var(--amber) 50%, transparent);
    transition: width 1.5s var(--easeOutQuart) 1.4s;
}
.hero.is-on .hero-rule-line { width: 100%; }

.hero-subtitle {
    font-family: var(--font-anno);
    font-size: clamp(20px, 2.4vw, 30px);
    color: var(--amber);
    transform: rotate(-1deg);
    opacity: 0;
    transition: opacity 1.0s ease 2.2s;
}
.hero.is-on .hero-subtitle { opacity: 1; }

.hero-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 3.2vh;
    font-family: var(--font-accent);
    font-size: 12px;
    letter-spacing: 0.3em;
    color: var(--slate);
    opacity: 0;
    transition: opacity 0.8s ease 2.6s;
}
.hero.is-on .hero-meta { opacity: 1; }
.meta-tag.right { color: var(--logic-blue); }

.hero-scroll-indicator {
    position: absolute;
    bottom: 4vh;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    opacity: 0;
    transition: opacity 1s ease 2.8s;
}
.hero.is-on .hero-scroll-indicator { opacity: 1; }

.scroll-label {
    font-family: var(--font-accent);
    font-size: 11px;
    letter-spacing: 0.4em;
    color: var(--parchment);
}
.scroll-arrow {
    width: 1px;
    height: 36px;
    background: linear-gradient(to bottom, var(--parchment), transparent);
    animation: scrollHint 2.4s ease-in-out infinite;
}
@keyframes scrollHint {
    0%, 100% { transform: translateY(0); opacity: 0.7; }
    50%      { transform: translateY(8px); opacity: 1; }
}

/* =====================================================================
   PROPOSITION STACK  (top accumulator bars)
   ===================================================================== */
.proposition-stack {
    position: fixed;
    top: 0; left: 0;
    width: 100%;
    height: auto;
    z-index: 30;
    display: flex;
    flex-direction: column;
    pointer-events: none;
}

.proposition-stack .stack-bar {
    width: 0%;
    height: 4px;
    transition: width 0.8s var(--easeOutQuart);
    border-bottom: 1px solid rgba(15,15,26,0.4);
}

/* =====================================================================
   PROGRESS RAIL (right edge)
   ===================================================================== */
.progress-rail {
    position: fixed;
    top: 0;
    right: 0;
    width: 60px;
    height: 100vh;
    z-index: 25;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.6s ease;
}
.progress-rail.is-visible { opacity: 1; }

.progress-track {
    position: absolute;
    top: 12vh;
    bottom: 12vh;
    right: 24px;
    width: 3px;
    background: rgba(232,228,217,0.08);
}
.progress-fill {
    position: absolute;
    top: 12vh;
    right: 24px;
    width: 3px;
    height: 0;
    background: linear-gradient(to bottom, var(--rhetoric), var(--amber));
    transition: height 0.18s linear;
}
.progress-ticks {
    list-style: none;
    position: absolute;
    top: 12vh;
    bottom: 12vh;
    right: 12px;
    width: 36px;
    pointer-events: auto;
}
.progress-ticks li {
    position: absolute;
    right: 0;
    transform: translateY(-50%);
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    color: var(--parchment);
    opacity: 0.55;
    transition: opacity 0.25s ease, color 0.25s ease;
}
.progress-ticks li:hover, .progress-ticks li.is-current {
    opacity: 1;
    color: var(--amber);
}
.progress-ticks li .tick-mark {
    display: block;
    width: 14px;
    height: 1.5px;
    background: currentColor;
}
.progress-ticks li .tick-num {
    font-family: var(--font-accent);
    font-size: 9px;
    letter-spacing: 0.15em;
}

/* =====================================================================
   TREATISE LAYOUT
   ===================================================================== */
.treatise {
    position: relative;
    display: flex;
    width: 100%;
    z-index: 5;
    background: var(--thesis-indigo);
}

/* ---------- LEFT: ARGUMENT INDEX ---------- */
.argument-index {
    width: var(--col-index-w);
    background: var(--abyss);
    border-right: 1px solid rgba(58,80,107,0.35);
    position: relative;
}

.index-sticky {
    position: sticky;
    top: 0;
    height: 100vh;
    padding: 6vh 5% 5vh;
    display: flex;
    flex-direction: column;
    gap: 18px;
    overflow: hidden;
}

.index-sticky::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
        radial-gradient(420px 280px at 70% 10%, rgba(212,162,78,0.08), transparent 70%),
        radial-gradient(380px 260px at 20% 90%, rgba(201,70,61,0.07), transparent 70%);
    pointer-events: none;
}

.index-header {
    position: relative;
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    border-bottom: 1px solid rgba(58,80,107,0.45);
    padding-bottom: 14px;
}

.index-label {
    font-family: var(--font-accent);
    font-size: 12px;
    letter-spacing: 0.4em;
    color: var(--logic-blue);
}

.index-counter {
    font-family: var(--font-accent);
    font-size: 36px;
    letter-spacing: 0.05em;
    color: var(--parchment);
    line-height: 1;
}
.index-counter .slash  { color: var(--slate); padding: 0 4px; }
.index-counter .total-num { color: var(--rhetoric); }

.index-graph-wrap {
    position: relative;
    flex: 1;
    min-height: 320px;
    margin: 12px 0;
}

.argument-graph {
    width: 100%;
    height: 100%;
    display: block;
}

/* graph nodes */
.graph-nodes .node circle {
    fill: var(--abyss);
    stroke: var(--logic-blue);
    stroke-width: 1.8;
    transition: fill 0.4s ease, stroke 0.4s ease, transform 0.5s var(--easeOutQuart);
    transform-origin: center;
    transform-box: fill-box;
}

.graph-nodes .node {
    cursor: pointer;
}

.graph-nodes .node text {
    font-family: var(--font-accent);
    font-size: 10px;
    letter-spacing: 0.1em;
    fill: var(--parchment);
    text-anchor: middle;
    dominant-baseline: middle;
    pointer-events: none;
}

.graph-nodes .node.is-pending circle {
    stroke: var(--slate);
    fill: var(--abyss);
}

.graph-nodes .node.is-current circle {
    stroke: var(--amber);
    stroke-width: 2.4;
    fill: rgba(212,162,78,0.12);
    animation: nodePulse 2s ease-in-out infinite;
}
.graph-nodes .node.is-current text {
    fill: var(--amber);
}

@keyframes nodePulse {
    0%, 100% { opacity: 0.7; }
    50%      { opacity: 1; }
}

.graph-nodes .node.is-done circle {
    stroke: var(--rhetoric);
    fill: rgba(201,70,61,0.30);
}
.graph-nodes .node.is-done text { fill: var(--bright-parch); }

/* graph edges */
.graph-edges .edge {
    fill: none;
    stroke: var(--slate);
    stroke-width: 1.5;
    stroke-dasharray: 240;
    stroke-dashoffset: 240;
    marker-end: url(#arrowhead);
    transition: stroke-dashoffset 0.8s var(--easeOutQuart), stroke 0.4s ease;
}
.graph-edges .edge.is-drawn {
    stroke-dashoffset: 0;
    stroke: var(--logic-blue);
}
.graph-edges .edge.is-active-trace {
    stroke: var(--amber);
}

/* temporary trace lines on hover */
.graph-traces .trace {
    fill: none;
    stroke: var(--amber);
    stroke-width: 1.5;
    stroke-dasharray: 4 3;
    opacity: 0.8;
    pointer-events: none;
}

.index-legend {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 6px;
    font-family: var(--font-accent);
    font-size: 11px;
    letter-spacing: 0.18em;
    color: var(--parchment);
    opacity: 0.78;
}
.legend-row { display: flex; align-items: center; gap: 10px; }
.legend-row .dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    border: 1.5px solid var(--logic-blue);
    background: var(--abyss);
    display: inline-block;
}
.legend-row .dot.live    { border-color: var(--amber); background: rgba(212,162,78,0.2); }
.legend-row .dot.done    { border-color: var(--rhetoric); background: rgba(201,70,61,0.3); }
.legend-row .dot.pending { border-color: var(--slate); background: var(--abyss); }

.index-foot {
    position: relative;
    display: flex;
    align-items: center;
    gap: 12px;
    padding-top: 14px;
    border-top: 1px solid rgba(58,80,107,0.35);
    font-family: var(--font-accent);
    font-size: 11px;
    letter-spacing: 0.3em;
    color: var(--slate);
}

/* ---------- RIGHT: PROPOSITIONS ---------- */
.propositions {
    position: relative;
    width: var(--col-prop-w);
    padding: 0;
    overflow: hidden;
}

.rhetoric-lines {
    position: absolute;
    top: 0; left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
    overflow: visible;
}
.rhetoric-lines .rl {
    fill: none;
    stroke: rgba(212,162,78,0.35);
    stroke-width: 1;
    stroke-dasharray: 1500;
    stroke-dashoffset: 1500;
    transition: stroke-dashoffset 1.6s var(--easeOutQuart);
}
.rhetoric-lines .rl.is-on { stroke-dashoffset: 0; }

.proposition {
    position: relative;
    min-height: 100vh;
    padding: 12vh 8% 12vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    border-bottom: 1px solid rgba(58,80,107,0.18);
    z-index: 2;
}

.prop-watermark {
    position: absolute;
    top: 50%;
    right: -2%;
    transform: translateY(-50%);
    font-family: var(--font-accent);
    font-size: 40vw;
    line-height: 0.8;
    color: var(--slate);
    opacity: 0.03;
    pointer-events: none;
    letter-spacing: -0.04em;
    z-index: 0;
}

.prop-rule {
    width: 0%;
    height: 1px;
    background: linear-gradient(90deg, var(--rhetoric), transparent);
    margin-bottom: 4vh;
    transition: width 0.8s var(--easeOutQuart);
}
.proposition.is-active .prop-rule { width: 60%; }

.prop-header {
    display: flex;
    align-items: baseline;
    gap: 18px;
    margin-bottom: 3vh;
    position: relative;
    z-index: 2;
    flex-wrap: wrap;
}

.prop-number {
    font-family: var(--font-accent);
    font-size: 22px;
    letter-spacing: 0.3em;
    color: var(--rhetoric);
    cursor: pointer;
    border-bottom: 1px solid transparent;
    transition: color 0.25s ease, border-color 0.25s ease;
}
.prop-number:hover { color: var(--amber); border-color: var(--amber); }

.prop-tag {
    font-family: var(--font-anno);
    font-size: 18px;
    color: var(--amber);
    transform: rotate(-1.5deg);
    display: inline-block;
}

.prop-kinetic {
    font-family: var(--font-display);
    font-weight: 900;
    text-transform: uppercase;
    line-height: 1.05;
    letter-spacing: 0.02em;
    color: var(--bright-parch);
    margin-bottom: 5vh;
    font-size: clamp(40px, 5.6vw, 88px);
    position: relative;
    z-index: 2;
    display: flex;
    flex-wrap: wrap;
    gap: 0.22em 0.32em;
}

.prop-kinetic .kw {
    display: inline-block;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.5s var(--easeOutQuart), transform 0.5s var(--easeOutQuart);
}

.proposition.is-active .prop-kinetic .kw { opacity: 1; transform: translateY(0); }

.prop-kinetic .kw.em {
    color: var(--rhetoric);
    font-style: italic;
    position: relative;
}
.prop-kinetic .kw.em::after {
    content: "";
    position: absolute;
    left: 0; bottom: 0.06em;
    width: 100%;
    height: 0.08em;
    background: var(--amber);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.6s var(--easeOutQuart) 0.4s;
}
.proposition.is-active .prop-kinetic .kw.em::after { transform: scaleX(1); }

.prop-body {
    max-width: 720px;
    position: relative;
    z-index: 2;
    color: var(--parchment);
    font-size: 18px;
    line-height: 1.85;
    font-family: var(--font-body);
}

.prop-body p { margin-bottom: 1.4em; }
.prop-body p.prop-lead {
    font-size: 22px;
    line-height: 1.6;
    color: var(--bright-parch);
    border-left: 2px solid var(--rhetoric);
    padding-left: 22px;
    font-weight: 600;
}

.prop-body em { color: var(--amber); font-style: italic; }
.prop-body .inline-mark {
    background: linear-gradient(transparent 60%, rgba(212,162,78,0.28) 60%);
    padding: 0 4px;
    color: var(--bright-parch);
}

.prop-link {
    color: var(--logic-blue);
    border-bottom: 1px dotted var(--logic-blue);
    transition: color 0.25s, border-color 0.25s;
    cursor: pointer;
}
.prop-link:hover { color: var(--amber); border-color: var(--amber); }

/* annotations */
.annotation {
    position: absolute;
    font-family: var(--font-anno);
    font-size: clamp(18px, 1.5vw, 26px);
    color: var(--amber);
    max-width: 220px;
    z-index: 3;
    line-height: 1.2;
    pointer-events: none;
    text-shadow: 0 0 12px rgba(15,15,26,0.6);
    opacity: 0;
    transform: translateY(8px) rotate(0deg);
    transition: opacity 0.6s ease, transform 0.6s var(--easeOutQuart);
}
.proposition.is-active .annotation { opacity: 0.95; }
.annotation.rot-l { transform: rotate(-3deg); }
.annotation.rot-r { transform: rotate(3deg); }
.proposition.is-active .annotation.rot-l { transform: translateY(0) rotate(-3deg); }
.proposition.is-active .annotation.rot-r { transform: translateY(0) rotate(3deg); }

/* QED final */
.qed {
    margin-top: 3em !important;
    font-family: var(--font-display);
    font-size: 26px;
    color: var(--rhetoric);
    letter-spacing: 0.1em;
}
.qed .seal {
    display: inline-block;
    border: 1.5px solid var(--rhetoric);
    padding: 6px 14px;
    margin-left: 12px;
    color: var(--bright-parch);
    background: rgba(201,70,61,0.12);
    font-family: var(--font-display);
    font-weight: 700;
    transform: rotate(-2deg);
    box-shadow: 0 0 0 4px rgba(201,70,61,0.04);
}

/* final proposition */
.proposition.final {
    background:
        radial-gradient(700px 460px at 70% 50%, rgba(201,70,61,0.06), transparent 70%),
        var(--thesis-indigo);
}

/* =====================================================================
   COLOPHON
   ===================================================================== */
.colophon {
    position: relative;
    background: var(--abyss);
    padding: 14vh 8% 10vh;
    color: var(--parchment);
    border-top: 1px solid rgba(58,80,107,0.4);
}

.colophon-rule {
    width: 80%;
    height: 1px;
    background: linear-gradient(90deg, var(--rhetoric), var(--amber), transparent);
    margin-bottom: 6vh;
}

.colophon-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 4vw;
    margin-bottom: 8vh;
}
.col-label {
    display: block;
    font-family: var(--font-accent);
    letter-spacing: 0.4em;
    font-size: 12px;
    color: var(--rhetoric);
    margin-bottom: 12px;
}
.colophon p {
    font-size: 16px;
    color: var(--parchment);
    line-height: 1.7;
    font-family: var(--font-body);
}

.colophon-mark {
    font-family: var(--font-display);
    font-weight: 900;
    font-size: clamp(36px, 6vw, 90px);
    letter-spacing: 0.08em;
    color: var(--bright-parch);
    text-align: center;
    border-top: 1px solid rgba(58,80,107,0.35);
    padding-top: 4vh;
}

/* =====================================================================
   RESPONSIVE
   ===================================================================== */
@media (max-width: 1024px) {
    .treatise { flex-direction: column; }
    .argument-index { width: 100%; border-right: none; border-bottom: 1px solid rgba(58,80,107,0.35); }
    .index-sticky { height: auto; min-height: 60vh; }
    .propositions { width: 100%; }
    .progress-rail { width: 44px; }
}

@media (max-width: 700px) {
    html, body { font-size: 16px; }
    .prop-kinetic { font-size: clamp(30px, 8vw, 56px); }
    .proposition { padding: 10vh 6% 10vh; }
    .annotation { display: none; }
    .colophon-grid { grid-template-columns: 1fr; gap: 5vh; }
    .progress-rail { display: none; }
    .hero-kanji.riron { font-size: 22vw; }
    .hero-kanji.busou { font-size: 26vw; }
}