/* =====================================================================
   mujun.quest — A Meditation on Contradiction
   Palette: spear/shield duotone with collision red and kintsugi gold
   ===================================================================== */

:root {
    --spear-black: #0a0a0a;
    --shield-white: #f4f0eb;
    --collision-red: #c23028;
    --ink-gray: #5c5c5c;
    --paper-cream: #e8e0d4;
    --deep-indigo: #1a1a3e;
    --gold-thread: #b8860b;

    --font-display: "Playfair Display", "Georgia", serif;
    --font-body: "Work Sans", "Inter", "Helvetica Neue", sans-serif;
    --font-cjk: "Noto Serif JP", "Playfair Display", serif;
    --font-mono: "Fira Code", "Menlo", monospace;
}

/* ---------- reset ---------- */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    scroll-snap-type: y proximity;
    background: var(--spear-black);
}

body {
    font-family: var(--font-body);
    font-size: 18px;
    line-height: 1.8;
    color: var(--ink-gray);
    background: var(--spear-black);
    overflow-x: hidden;
    min-height: 100vh;
}

main#scroll-stage {
    position: relative;
    width: 100%;
    overflow-x: hidden;
}

/* ---------- particle canvas ---------- */
#particle-canvas {
    position: fixed;
    inset: 0;
    width: 100vw;
    height: 100vh;
    z-index: 50;
    pointer-events: none;
    mix-blend-mode: normal;
}

/* ---------- broken line scroll progress ---------- */
#broken-line {
    position: fixed;
    top: 0;
    right: 2rem;
    width: 4px;
    height: 100vh;
    z-index: 60;
    pointer-events: none;
}

/* =====================================================================
   SECTION BASE
   ===================================================================== */
.section {
    position: relative;
    width: 100%;
    min-height: 100vh;
    padding: 8vh 6vw;
    scroll-snap-align: start;
    overflow: hidden;
}

.section-marker {
    position: relative;
    display: flex;
    align-items: baseline;
    gap: 1.2rem;
    margin-bottom: 4rem;
    font-family: var(--font-display);
    color: var(--ink-gray);
    z-index: 5;
}

.section-marker-light {
    color: var(--paper-cream);
}

.marker-num {
    font-size: 2.2rem;
    font-weight: 400;
    letter-spacing: 0.1em;
    font-style: italic;
    opacity: 0.6;
}

.marker-name {
    font-family: var(--font-body);
    font-size: 0.85rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.4em;
    opacity: 0.85;
    border-left: 1px solid currentColor;
    padding-left: 1.2rem;
}

/* =====================================================================
   SECTION 1 — THE PARADOX
   ===================================================================== */
.section-paradox {
    background: var(--spear-black);
    height: 100vh;
    min-height: 100vh;
    padding: 0;
    color: var(--shield-white);
}

.paradox-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.paradox-half {
    position: absolute;
    top: 0;
    bottom: 0;
    width: 50%;
    transition: opacity 1.2s ease;
}

.paradox-half-left {
    left: 0;
    background: var(--spear-black);
}

.paradox-half-right {
    right: 0;
    background: var(--shield-white);
}

/* After collision the bg morphs into a radial indigo gradient */
.section-paradox.collided .paradox-half-left,
.section-paradox.collided .paradox-half-right {
    opacity: 0;
}

.section-paradox::after {
    content: "";
    position: absolute;
    inset: 0;
    z-index: 1;
    background: radial-gradient(circle at 50% 50%,
        var(--deep-indigo) 0%,
        rgba(26, 26, 62, 0.85) 35%,
        rgba(10, 10, 10, 0.0) 70%);
    opacity: 0;
    transition: opacity 1.4s ease;
    pointer-events: none;
}

.section-paradox.collided::after {
    opacity: 1;
}

/* Kanji stage */
.kanji-stage {
    position: absolute;
    inset: 0;
    z-index: 2;
    display: flex;
    align-items: center;
    justify-content: center;
}

.kanji {
    position: absolute;
    font-family: var(--font-cjk);
    font-weight: 900;
    font-size: clamp(14rem, 38vw, 44rem);
    line-height: 1;
    user-select: none;
    will-change: transform, opacity;
    letter-spacing: -0.05em;
}

.kanji-spear {
    left: -10vw;
    top: 50%;
    transform: translateY(-50%) translateX(0) rotate(-4deg);
    color: var(--shield-white);
    animation: spearAdvance 3s cubic-bezier(0.22, 1, 0.36, 1) forwards;
    text-shadow: 0 0 60px rgba(244, 240, 235, 0.06);
}

.kanji-shield {
    right: -8vw;
    top: 50%;
    transform: translateY(-50%) translateX(0);
    color: var(--spear-black);
    animation: shieldVibrate 2s ease-in-out infinite;
    text-shadow: 0 0 60px rgba(10, 10, 10, 0.08);
}

@keyframes spearAdvance {
    0% {
        transform: translate(-30vw, -50%) rotate(-12deg);
        opacity: 0;
    }
    35% {
        opacity: 1;
    }
    100% {
        transform: translate(0, -50%) rotate(-4deg);
        opacity: 1;
    }
}

@keyframes shieldVibrate {
    0%, 100% { transform: translate(0, -50%); }
    25%      { transform: translate(2px, -50%); }
    50%      { transform: translate(0, -50%); }
    75%      { transform: translate(-2px, -50%); }
}

/* Collision phase — both kanji rush to center, fade out */
.section-paradox.colliding .kanji-spear {
    animation: spearCollide 0.9s cubic-bezier(0.55, 0, 0.1, 1) forwards;
}

.section-paradox.colliding .kanji-shield {
    animation: shieldCollide 0.9s cubic-bezier(0.55, 0, 0.1, 1) forwards;
}

@keyframes spearCollide {
    0%   { transform: translate(0, -50%) rotate(-4deg); opacity: 1; filter: blur(0); }
    60%  { transform: translate(35vw, -50%) rotate(8deg); opacity: 1; filter: blur(2px); }
    100% { transform: translate(40vw, -50%) rotate(12deg); opacity: 0; filter: blur(20px); }
}

@keyframes shieldCollide {
    0%   { transform: translate(0, -50%); opacity: 1; filter: blur(0); }
    60%  { transform: translate(-32vw, -50%); opacity: 1; filter: blur(2px); }
    100% { transform: translate(-38vw, -50%); opacity: 0; filter: blur(20px); }
}

.kanji-compound {
    font-family: var(--font-cjk);
    font-weight: 900;
    font-size: clamp(8rem, 22vw, 22rem);
    color: var(--collision-red);
    opacity: 0;
    transform: translateY(-50%) scale(0.6);
    transition:
        opacity 1.6s ease 0.6s,
        transform 1.6s cubic-bezier(0.22, 1, 0.36, 1) 0.6s;
    text-shadow: 0 0 80px rgba(194, 48, 40, 0.4);
    letter-spacing: -0.04em;
    top: 50%;
    will-change: transform, opacity;
}

.section-paradox.collided .kanji-compound {
    opacity: 1;
    transform: translateY(-50%) scale(1);
}

/* Caption block — paradox statement */
.paradox-caption {
    position: absolute;
    left: 6vw;
    bottom: 8vh;
    z-index: 3;
    max-width: 38rem;
    color: var(--paper-cream);
    transition: opacity 1s ease 0.6s, transform 1s ease 0.6s;
    opacity: 0;
    transform: translateY(20px);
}

.section-paradox.collided .paradox-caption {
    opacity: 1;
    transform: translateY(0);
}

.caption-eyebrow {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    letter-spacing: 0.3em;
    text-transform: lowercase;
    color: var(--collision-red);
    margin-bottom: 1.8rem;
}

.caption-line {
    font-family: var(--font-display);
    font-size: clamp(1.4rem, 2.4vw, 2.1rem);
    line-height: 1.35;
    font-weight: 400;
    margin-bottom: 0.6rem;
}

.caption-line-counter {
    font-weight: 700;
    color: var(--shield-white);
}

.caption-line-quiet {
    margin-top: 1.4rem;
    font-style: italic;
    font-size: clamp(1rem, 1.6vw, 1.3rem);
    color: var(--gold-thread);
}

/* Scroll cue */
.scroll-cue {
    position: absolute;
    right: 6vw;
    bottom: 6vh;
    z-index: 3;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.8rem;
    color: var(--paper-cream);
    opacity: 0.7;
    transition: opacity 1s ease 0.6s;
}

.section-paradox.collided .scroll-cue {
    opacity: 0;
}

.scroll-cue-label {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.4em;
    text-transform: lowercase;
}

.scroll-cue-glyph {
    width: 1px;
    height: 48px;
    background: linear-gradient(to bottom, transparent, var(--paper-cream));
    animation: cueDrip 2.4s ease-in-out infinite;
}

@keyframes cueDrip {
    0%, 100% { transform: scaleY(0.3); transform-origin: top; opacity: 0.3; }
    50%      { transform: scaleY(1); transform-origin: top; opacity: 1; }
}

/* =====================================================================
   SECTION 2 — THE MERCHANT'S CLAIM
   ===================================================================== */
.section-claim {
    background: linear-gradient(180deg,
        var(--spear-black) 0%,
        var(--spear-black) 40%,
        var(--shield-white) 60%,
        var(--shield-white) 100%);
    color: var(--ink-gray);
    padding: 12vh 0;
    min-height: 130vh;
}

.section-claim .section-marker {
    padding-left: 6vw;
    color: var(--paper-cream);
}

.claim-stage {
    position: relative;
    width: 100%;
    min-height: 90vh;
    margin-top: 4rem;
}

.claim-block {
    position: absolute;
    width: 45vw;
    padding: 4rem 3rem;
    transition: filter 0.8s ease, transform 0.8s ease;
    will-change: filter, transform;
}

.claim-block-spear {
    left: 5vw;
    top: 0;
    background: var(--spear-black);
    color: var(--shield-white);
    border-left: 3px solid var(--collision-red);
    box-shadow: 0 30px 80px rgba(10, 10, 10, 0.5);
    z-index: 2;
}

.claim-block-shield {
    right: 5vw;
    top: 18vh;
    background: var(--shield-white);
    color: var(--ink-gray);
    border-right: 3px solid var(--gold-thread);
    box-shadow: 0 30px 80px rgba(10, 10, 10, 0.15);
    z-index: 1;
}

/* Overlap zone — blocks physically overlap by ~15vw */
@media (min-width: 900px) {
    .claim-block-spear { width: 48vw; }
    .claim-block-shield { width: 48vw; }
    .claim-block-spear { left: 4vw; }
    .claim-block-shield { right: 4vw; top: 22vh; }
}

/* mix-blend-mode in overlap area */
.claim-block-shield {
    mix-blend-mode: difference;
}

/* Blur-focus interaction (toggled by scroll) */
.claim-block.is-blurred {
    filter: blur(1.5px);
}

.claim-block.is-focused {
    filter: blur(0);
}

.claim-title {
    font-family: var(--font-cjk);
    font-weight: 700;
    font-size: clamp(2rem, 3.4vw, 3rem);
    margin-bottom: 2rem;
    letter-spacing: 0.08em;
}

.claim-block-spear .claim-title {
    color: var(--collision-red);
    border-bottom: 1px solid var(--collision-red);
    padding-bottom: 1rem;
}

.claim-block-shield .claim-title {
    color: var(--gold-thread);
    border-bottom: 1px solid var(--gold-thread);
    padding-bottom: 1rem;
}

.claim-vertical-text {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    font-family: var(--font-cjk);
    font-size: 1.05rem;
    line-height: 1.9;
    height: 60vh;
    max-height: 600px;
    column-gap: 2rem;
    letter-spacing: 0.05em;
}

.claim-vertical-text p {
    margin-left: 1.6rem;
    color: var(--shield-white);
}

.claim-vertical-text p:first-child {
    color: var(--collision-red);
    font-weight: 700;
}

.claim-horizontal-text {
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.85;
}

.claim-horizontal-text p {
    margin-bottom: 1.4rem;
    color: var(--ink-gray);
}

.claim-horizontal-text p:nth-child(2) {
    font-family: var(--font-cjk);
    color: var(--spear-black);
    font-style: italic;
    border-left: 2px solid var(--gold-thread);
    padding-left: 1.2rem;
}

/* Overlap marker — × glyph centered in collision zone */
.claim-overlap-marker {
    position: absolute;
    top: 35vh;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 3;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.4rem;
    color: var(--collision-red);
    pointer-events: none;
    mix-blend-mode: normal;
}

.overlap-glyph {
    font-family: var(--font-display);
    font-size: clamp(3rem, 6vw, 5rem);
    font-weight: 400;
    line-height: 1;
    text-shadow: 0 0 30px rgba(194, 48, 40, 0.6);
    animation: overlapPulse 3s ease-in-out infinite;
}

.overlap-label {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.4em;
    text-transform: lowercase;
    color: var(--gold-thread);
}

@keyframes overlapPulse {
    0%, 100% { transform: rotate(0deg) scale(1); opacity: 0.85; }
    50%      { transform: rotate(90deg) scale(1.05); opacity: 1; }
}

.claim-question {
    margin: 8rem auto 0;
    text-align: center;
    max-width: 40rem;
    font-family: var(--font-display);
    font-size: clamp(1.2rem, 2vw, 1.8rem);
    font-style: italic;
    color: var(--ink-gray);
    padding: 0 6vw;
}

.claim-question-text {
    border-bottom: 1px solid var(--gold-thread);
    padding-bottom: 0.4rem;
}

/* =====================================================================
   SECTION 3 — THE DISSOLUTION (timeline)
   ===================================================================== */
.section-timeline {
    background: var(--deep-indigo);
    color: var(--paper-cream);
    padding: 14vh 6vw 18vh;
    min-height: 100vh;
}

.section-timeline .section-marker {
    color: var(--paper-cream);
}

.timeline-lede {
    max-width: 36rem;
    margin: 0 auto 6rem;
    text-align: center;
    font-family: var(--font-display);
    font-size: clamp(1.1rem, 1.8vw, 1.5rem);
    font-style: italic;
    line-height: 1.6;
    color: var(--paper-cream);
    opacity: 0.8;
}

.timeline-thread {
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    height: 100%;
    transform: translateX(-50%);
    pointer-events: none;
    z-index: 1;
}

#thread-path {
    stroke-dasharray: 1000;
    stroke-dashoffset: 1000;
    transition: stroke-dashoffset 0.8s linear;
}

.timeline-list {
    list-style: none;
    position: relative;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0;
    z-index: 2;
}

.timeline-card {
    position: relative;
    width: 320px;
    padding: 2.4rem 2rem;
    margin-bottom: 5rem;
    opacity: 0;
    transform: scale(0.92) translateY(30px);
    transition:
        opacity 0.9s cubic-bezier(0.22, 1, 0.36, 1),
        transform 0.9s cubic-bezier(0.22, 1, 0.36, 1);
    will-change: transform, opacity;
}

.timeline-card.is-visible {
    opacity: 1;
    transform: scale(1) translateY(0);
}

.timeline-card-spear {
    background: var(--spear-black);
    color: var(--paper-cream);
    border-left: 3px solid var(--collision-red);
    margin-right: auto;
    margin-left: calc(50% - 360px);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4);
}

.timeline-card-shield {
    background: var(--shield-white);
    color: var(--ink-gray);
    border-right: 3px solid var(--gold-thread);
    margin-left: auto;
    margin-right: calc(50% - 360px);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.25);
}

.card-index {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--gold-thread);
    margin-bottom: 0.8rem;
}

.card-title {
    font-family: var(--font-display);
    font-size: 1.6rem;
    margin-bottom: 0.4rem;
    line-height: 1.2;
}

.timeline-card-spear .card-title {
    font-weight: 700;
    color: var(--shield-white);
}

.timeline-card-shield .card-title {
    font-family: var(--font-body);
    font-weight: 500;
    color: var(--spear-black);
}

.card-meta {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    margin-bottom: 1.2rem;
    opacity: 0.7;
}

.timeline-card-spear .card-meta { color: var(--collision-red); }
.timeline-card-shield .card-meta { color: var(--gold-thread); }

.card-body {
    font-size: 0.96rem;
    line-height: 1.7;
    margin-bottom: 1.4rem;
}

.card-formal {
    font-family: var(--font-mono);
    font-size: 0.82rem;
    line-height: 1.5;
    padding: 0.8rem 1rem;
    border-top: 1px dashed currentColor;
    opacity: 0.85;
    word-break: break-word;
}

.timeline-card-spear .card-formal {
    color: var(--gold-thread);
    border-top-color: rgba(184, 134, 11, 0.45);
}

.timeline-card-shield .card-formal {
    color: var(--collision-red);
    border-top-color: rgba(194, 48, 40, 0.4);
}

/* On smaller screens, stack timeline */
@media (max-width: 880px) {
    .timeline-card-spear,
    .timeline-card-shield {
        margin-left: 0;
        margin-right: 0;
        width: 100%;
        max-width: 460px;
    }
    .timeline-card-shield {
        margin-left: auto;
    }
    .timeline-thread { left: 1rem; }
}

/* =====================================================================
   SECTION 4 — THE RESOLUTION
   ===================================================================== */
.section-resolution {
    background: var(--paper-cream);
    color: var(--ink-gray);
    padding: 14vh 6vw 24vh;
    min-height: 110vh;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.section-resolution .section-marker {
    align-self: flex-start;
    color: var(--ink-gray);
}

.resolution-stage {
    flex: 1;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 4rem;
}

.resolution-frame {
    position: relative;
    max-width: 600px;
    width: 90%;
    padding: 6rem 4rem;
    border: 1px solid var(--gold-thread);
    background: rgba(244, 240, 235, 0.4);
    text-align: center;
    animation: framePulse 4s ease-in-out infinite;
}

@keyframes framePulse {
    0%, 100% {
        border-color: rgba(184, 134, 11, 0.4);
        box-shadow: 0 0 0 rgba(184, 134, 11, 0);
    }
    50% {
        border-color: rgba(184, 134, 11, 1);
        box-shadow: 0 0 60px rgba(184, 134, 11, 0.18);
    }
}

.resolution-question {
    font-family: var(--font-display);
    font-size: clamp(1.4rem, 2.6vw, 2rem);
    font-weight: 400;
    line-height: 1.55;
    color: var(--ink-gray);
    font-style: italic;
}

.resolution-empty {
    margin-top: 6rem;
    min-height: 50vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.resolution-empty-mark {
    font-family: var(--font-cjk);
    font-size: clamp(6rem, 14vw, 14rem);
    font-weight: 400;
    color: var(--gold-thread);
    opacity: 0.18;
    line-height: 1;
    user-select: none;
    transition: opacity 1.5s ease;
}

.resolution-empty-mark:hover {
    opacity: 0.35;
}

.resolution-signoff {
    margin-top: 4rem;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.4em;
    text-transform: lowercase;
    color: var(--ink-gray);
    opacity: 0.5;
    text-align: center;
}

/* =====================================================================
   RESPONSIVE
   ===================================================================== */
@media (max-width: 768px) {
    body { font-size: 16px; }

    #broken-line { right: 0.6rem; }

    .paradox-caption {
        left: 5vw;
        right: 5vw;
        bottom: 12vh;
        max-width: none;
    }

    .scroll-cue { right: 5vw; bottom: 4vh; }

    .claim-block {
        position: relative;
        width: 90vw !important;
        left: auto !important;
        right: auto !important;
        top: auto !important;
        margin: 0 auto 3rem;
    }

    .claim-block-shield {
        mix-blend-mode: normal;
    }

    .claim-vertical-text {
        height: 50vh;
        max-height: 480px;
    }

    .claim-overlap-marker {
        position: relative;
        top: auto;
        left: auto;
        transform: none;
        margin: 1rem auto 3rem;
    }

    .section-claim {
        padding: 8vh 0;
        min-height: auto;
    }

    .resolution-frame {
        padding: 3rem 1.5rem;
    }
}