/* Ryvakio Home — Layout 45 · Scroll Chapters */

/* Chapter arc (right) */
.rvk-chapter-arc {
    position: fixed; right: 1.25rem; top: 50%; transform: translateY(-50%);
    z-index: 200; width: 72px; height: 72px;
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    pointer-events: none;
}
.rvk-chapter-arc__ring { position: absolute; inset: 0; width: 100%; height: 100%; transform: rotate(-90deg); }
.rvk-chapter-arc__track { fill: none; stroke: var(--rvk-border); stroke-width: 3; }
.rvk-chapter-arc__fill { fill: none; stroke: var(--rvk-copper); stroke-width: 3; stroke-linecap: round; stroke-dasharray: 327; stroke-dashoffset: 327; transition: stroke-dashoffset 0.5s var(--rvk-ease); }
.rvk-chapter-arc__num { font-family: var(--rvk-mono); font-size: 0.85rem; font-weight: 600; color: var(--rvk-copper); line-height: 1; }
.rvk-chapter-arc__label { font-size: 0.55rem; color: var(--rvk-fg-muted); letter-spacing: 0.1em; }

/* Bottom chapter ribbon */
.rvk-chapter-ribbon {
    position: fixed; bottom: 0; left: 0; right: 0; z-index: 280;
    height: var(--rvk-ribbon-h);
    background: var(--rvk-bar-bg); backdrop-filter: blur(16px);
    border-top: 1px solid var(--rvk-border);
    overflow-x: auto; scrollbar-width: none;
}
.rvk-chapter-ribbon::-webkit-scrollbar { display: none; }
.rvk-chapter-ribbon__list {
    list-style: none; margin: 0; padding: 0 1rem;
    display: flex; gap: 0.15rem; height: 100%; align-items: center;
    min-width: max-content;
}
.rvk-chapter-ribbon__list button {
    display: flex; align-items: center; gap: 0.4rem;
    padding: 0.45rem 0.85rem; border: none; border-radius: 999px;
    background: transparent; color: var(--rvk-fg-muted);
    font-size: 0.72rem; cursor: pointer; white-space: nowrap;
    transition: background 0.25s, color 0.25s;
}
.rvk-chapter-ribbon__list button span {
    font-family: var(--rvk-mono); font-size: 0.62rem; opacity: 0.7;
}
.rvk-chapter-ribbon__list button.is-current,
.rvk-chapter-ribbon__list button:hover {
    background: var(--rvk-copper-dim); color: var(--rvk-copper);
}

/* Scroll book container */
.rvk-scroll-book { scroll-snap-type: y proximity; }

.rvk-chapter {
    min-height: 100vh; min-height: 100dvh;
    scroll-snap-align: start;
    position: relative; overflow: hidden;
    padding: calc(var(--rvk-bar-h) + 2rem) var(--rvk-pad) calc(var(--rvk-ribbon-h) + 2rem);
}

/* Ch.01 Prologue */
.rvk-chapter--prologue {
    display: flex; align-items: center; justify-content: flex-start;
    padding-top: calc(var(--rvk-bar-h) + 1rem);
}
.rvk-prologue__bg {
    position: absolute; inset: 0; z-index: 0;
    clip-path: polygon(0 0, 100% 0, 100% 100%, 28% 100%);
    transition: clip-path 0.8s var(--rvk-ease);
}
.rvk-prologue__bg img { width: 100%; height: 100%; object-fit: cover; filter: brightness(0.7); }
.rvk-prologue__mask {
    position: absolute; inset: 0; z-index: 1;
    background: linear-gradient(105deg, var(--rvk-bg) 42%, transparent 58%);
    pointer-events: none;
}
[data-theme="dark"] .rvk-prologue__mask {
    background: linear-gradient(105deg, var(--rvk-void) 42%, transparent 58%);
}
.rvk-prologue__content {
    position: relative; z-index: 2; max-width: 560px; margin-left: clamp(0px, 8vw, 80px);
}
.rvk-prologue__title {
    font-family: var(--rvk-serif); font-weight: 800;
    font-size: clamp(2.2rem, 6vw, 3.8rem); line-height: 1.15; margin: 0 0 1.25rem;
}
.rvk-prologue__line { display: block; }
.rvk-prologue__line--accent em { font-style: normal; color: var(--rvk-copper); }
.rvk-prologue__lead { color: var(--rvk-fg-soft); max-width: 42ch; margin-bottom: 1.75rem; }
.rvk-prologue__cta { display: flex; flex-wrap: wrap; gap: 0.75rem; }
.rvk-prologue__float {
    position: absolute; bottom: calc(var(--rvk-ribbon-h) + 2rem); right: var(--rvk-pad);
    z-index: 2; display: flex; gap: 1.5rem;
    font-size: 0.72rem; color: var(--rvk-fg-muted);
}
.rvk-prologue__float span { display: block; font-family: var(--rvk-mono); font-size: 0.58rem; letter-spacing: 0.12em; margin-bottom: 0.2rem; }
.rvk-prologue__float strong { color: var(--rvk-fg); font-weight: 500; }

/* Ch.02 Echo — pinned stats */
.rvk-chapter--echo {
    display: flex; align-items: center; justify-content: center;
    background: var(--rvk-bg-alt);
}
.rvk-echo__pin { max-width: var(--rvk-max); width: 100%; text-align: center; }
.rvk-echo__head h2 { font-family: var(--rvk-serif); font-size: clamp(1.5rem, 3.5vw, 2.2rem); margin: 0; }
.rvk-echo__head em { font-style: normal; color: var(--rvk-copper); }
.rvk-echo__grid {
    display: flex; flex-wrap: wrap; justify-content: center; gap: 2rem;
    margin-top: 3rem;
}
.rvk-echo__stat { min-width: 120px; }
.rvk-echo__n { font-family: var(--rvk-serif); font-size: clamp(2.5rem, 5vw, 3.5rem); font-weight: 800; color: var(--rvk-copper); line-height: 1; }
.rvk-echo__u { font-size: 0.85rem; color: var(--rvk-fg-muted); margin-left: 0.15rem; }
.rvk-echo__stat p { font-size: 0.78rem; color: var(--rvk-fg-muted); margin: 0.35rem 0 0; }

/* Ch.03 Manifesto */
.rvk-chapter--manifesto { display: flex; align-items: center; }
.rvk-manifesto__overlap {
    display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 0;
    max-width: var(--rvk-max); margin: 0 auto; width: 100%; align-items: center;
}
.rvk-manifesto__fig {
    margin: 0; position: relative; z-index: 2;
    transform: translateX(8%);
}
.rvk-manifesto__fig img {
    width: 100%; max-height: 75vh; object-fit: cover;
    border-radius: var(--rvk-radius-lg);
    box-shadow: var(--rvk-shadow);
}
.rvk-manifesto__fig figcaption { margin-top: 0.5rem; }
.rvk-manifesto__text {
    background: var(--rvk-bg); padding: 2.5rem;
    margin-left: -4rem; position: relative; z-index: 1;
    border: 1px solid var(--rvk-border); border-radius: var(--rvk-radius-lg);
}
.rvk-manifesto__text h2 {
    font-family: var(--rvk-serif); font-size: clamp(1.6rem, 3vw, 2.4rem);
    line-height: 1.3; margin: 0 0 1.25rem;
}
.rvk-manifesto__text em { font-style: normal; color: var(--rvk-copper); }
.rvk-manifesto__verses p { color: var(--rvk-fg-soft); margin: 0 0 1rem; }
.rvk-manifesto__verses blockquote {
    margin: 1.5rem 0; padding-left: 1rem;
    border-left: 2px solid var(--rvk-copper);
    font-family: var(--rvk-serif); font-style: italic; color: var(--rvk-fg-soft);
}

/* Ch.04 Atelier — interactive */
.rvk-chapter--atelier { background: var(--rvk-charcoal); color: var(--rvk-parchment); }
.rvk-atelier__shell { max-width: var(--rvk-max); margin: 0 auto; width: 100%; }
.rvk-atelier__head { text-align: center; margin-bottom: 2rem; }
.rvk-atelier__head h2 { font-family: var(--rvk-serif); font-size: clamp(1.4rem, 3vw, 2rem); margin: 0; }
.rvk-atelier__head em { font-style: normal; color: var(--rvk-copper-bright); }
.rvk-atelier__head p { color: var(--rvk-mist); font-size: 0.88rem; }
.rvk-atelier__stage {
    display: grid; grid-template-columns: auto 1fr; gap: 2rem; align-items: center;
}
.rvk-atelier__grid {
    display: grid; grid-template-columns: repeat(2, 1fr); gap: 0.5rem;
}
.rvk-atelier__cell {
    width: 64px; height: 64px; border: 1px solid rgba(255,255,255,0.12);
    background: rgba(255,255,255,0.04); border-radius: var(--rvk-radius);
    font-family: var(--rvk-mono); font-size: 0.85rem; color: var(--rvk-mist);
    cursor: pointer; transition: background 0.25s, border-color 0.25s, transform 0.2s;
}
.rvk-atelier__cell:hover { border-color: var(--rvk-copper); transform: scale(1.05); }
.rvk-atelier__cell.is-active { background: var(--rvk-copper-dim); border-color: var(--rvk-copper); color: var(--rvk-copper-bright); }
.rvk-atelier__display {
    display: grid; grid-template-columns: 1.2fr 1fr; gap: 1.5rem;
    padding: 1.5rem; background: rgba(0,0,0,0.25); border-radius: var(--rvk-radius-lg);
    border: 1px solid rgba(255,255,255,0.08);
}
.rvk-atelier__img-wrap img { width: 100%; border-radius: var(--rvk-radius); transition: opacity 0.2s; }
.rvk-atelier__img-wrap img.is-fading { opacity: 0.4; }
.rvk-atelier__model { font-size: 0.78rem; color: var(--rvk-mist); margin: 0 0 0.5rem; }
.rvk-atelier__torque { font-family: var(--rvk-serif); font-size: 2.5rem; font-weight: 800; color: var(--rvk-copper-bright); margin: 0; line-height: 1; }
.rvk-atelier__rpm { font-family: var(--rvk-mono); font-size: 0.72rem; color: var(--rvk-mist); margin: 0.25rem 0 0.75rem; }
.rvk-atelier__note { font-size: 0.88rem; color: var(--rvk-parchment); margin: 0 0 1rem; }
.rvk-atelier__bar { height: 4px; background: rgba(255,255,255,0.1); border-radius: 2px; overflow: hidden; }
.rvk-atelier__bar span { display: block; height: 100%; background: var(--rvk-copper); transition: width 0.4s var(--rvk-ease); }

/* Ch.05 Route — horizontal scroll */
.rvk-chapter--route { padding-bottom: calc(var(--rvk-ribbon-h) + 1rem); }
.rvk-route__head { max-width: var(--rvk-max); margin: 0 auto 1.5rem; }
.rvk-route__head h2 { font-family: var(--rvk-serif); font-size: clamp(1.4rem, 3vw, 2rem); margin: 0; }
.rvk-route__head em { font-style: normal; color: var(--rvk-copper); }
.rvk-route__belt { overflow-x: auto; cursor: grab; scrollbar-width: none; padding: 0 var(--rvk-pad) 1rem; }
.rvk-route__belt::-webkit-scrollbar { display: none; }
.rvk-route__belt.is-dragging { cursor: grabbing; user-select: none; }
.rvk-route__track { display: flex; gap: 1.25rem; width: max-content; padding-right: 2rem; }
.rvk-route__card {
    width: min(420px, 85vw); flex-shrink: 0;
    border-radius: var(--rvk-radius-lg); overflow: hidden;
    border: 1px solid var(--rvk-border); background: var(--rvk-bg-alt);
    transition: transform 0.3s;
}
.rvk-route__card:hover { transform: translateY(-6px); }
.rvk-route__card img { width: 100%; height: 220px; object-fit: cover; }
.rvk-route__meta { padding: 1.15rem; }
.rvk-route__tag { font-family: var(--rvk-mono); font-size: 0.62rem; letter-spacing: 0.12em; color: var(--rvk-copper); }
.rvk-route__meta h3 { font-family: var(--rvk-serif); margin: 0.35rem 0; font-size: 1.15rem; }
.rvk-route__meta p { font-size: 0.85rem; color: var(--rvk-fg-soft); margin: 0; }
.rvk-route__card--text {
    display: flex; flex-direction: column; justify-content: center; align-items: center;
    padding: 2rem; min-height: 320px; text-align: center;
    background: linear-gradient(135deg, var(--rvk-copper-dim), transparent);
}
.rvk-route__quote { font-family: var(--rvk-serif); font-size: 1.25rem; font-style: italic; margin-bottom: 1.25rem; }

/* Ch.06 Forge timeline */
.rvk-chapter--forge { background: var(--rvk-bg-alt); }
.rvk-forge__layout {
    display: grid; grid-template-columns: 1fr 1fr; gap: 3rem;
    max-width: var(--rvk-max); margin: 0 auto; align-items: center; width: 100%;
}
.rvk-forge__visual img { width: 100%; border-radius: var(--rvk-radius-lg); object-fit: cover; max-height: 70vh; }
.rvk-forge__timeline h2 { font-family: var(--rvk-serif); font-size: clamp(1.4rem, 3vw, 2rem); margin: 0 0 1.5rem; }
.rvk-forge__timeline em { font-style: normal; color: var(--rvk-copper); }
.rvk-forge__steps { list-style: none; margin: 0; padding: 0; }
.rvk-forge__steps li {
    display: flex; gap: 1rem; padding: 1rem 0;
    border-bottom: 1px solid var(--rvk-border);
}
.rvk-forge__steps span {
    font-family: var(--rvk-mono); font-size: 0.72rem; color: var(--rvk-copper);
    min-width: 2rem;
}
.rvk-forge__steps strong { display: block; margin-bottom: 0.25rem; }
.rvk-forge__steps p { margin: 0; font-size: 0.85rem; color: var(--rvk-fg-soft); }

/* Ch.07 Prism — experimental fold */
.rvk-chapter--prism { padding: 0; min-height: 100vh; }
.rvk-prism__fold {
    display: grid; grid-template-columns: 1fr 1.2fr 0.8fr;
    min-height: 100vh; align-items: stretch;
    transform: skewY(0deg); transition: transform 0.6s var(--rvk-ease);
}
.rvk-prism__fold.is-flipped { transform: skewY(-2deg); }
.rvk-prism__panel { display: flex; flex-direction: column; justify-content: center; padding: 2rem; }
.rvk-prism__panel--a { background: var(--rvk-bg); clip-path: polygon(0 0, 100% 0, 95% 100%, 0 100%); }
.rvk-prism__panel--b { overflow: hidden; clip-path: polygon(5% 0, 100% 0, 100% 100%, 0 100%); }
.rvk-prism__panel--b img { width: 100%; height: 100%; object-fit: cover; min-height: 100%; }
.rvk-prism__panel--c { background: var(--rvk-charcoal); color: var(--rvk-parchment); clip-path: polygon(0 0, 100% 0, 100% 100%, 5% 100%); }
.rvk-prism__panel--c p { color: var(--rvk-mist); font-size: 0.9rem; margin-bottom: 1.25rem; }
.rvk-prism__panel h2 { font-family: var(--rvk-serif); font-size: clamp(1.3rem, 2.5vw, 1.8rem); line-height: 1.35; margin: 0; }
.rvk-prism__panel em { font-style: normal; color: var(--rvk-copper-bright); }

/* Ch.08 Voices */
.rvk-chapter--voices { background: var(--rvk-bg); }
.rvk-voices__wrap {
    display: grid; grid-template-columns: 1fr 0.75fr; gap: 2rem;
    max-width: var(--rvk-max); margin: 0 auto; align-items: center; width: 100%;
}
.rvk-voices__head h2 { font-family: var(--rvk-serif); font-size: clamp(1.4rem, 3vw, 2rem); margin: 0 0 1.5rem; }
.rvk-voices__head em { font-style: normal; color: var(--rvk-copper); }
.rvk-voices__slide {
    display: none; margin: 0; padding: 0;
    font-family: var(--rvk-serif); font-size: 1.1rem; line-height: 1.65;
}
.rvk-voices__slide.is-active { display: block; animation: rvkVoiceIn 0.5s var(--rvk-ease); }
@keyframes rvkVoiceIn { from { opacity: 0; transform: translateX(12px); } to { opacity: 1; transform: none; } }
.rvk-voices__slide footer { margin-top: 1rem; font-family: var(--rvk-sans); font-size: 0.78rem; color: var(--rvk-fg-muted); font-style: normal; }
.rvk-voices__dots { display: flex; gap: 0.5rem; margin-top: 1.25rem; }
.rvk-voices__dots button {
    width: 8px; height: 8px; border-radius: 50%; border: none;
    background: var(--rvk-border-strong); cursor: pointer; padding: 0;
    transition: background 0.25s, transform 0.25s;
}
.rvk-voices__dots button.is-active { background: var(--rvk-copper); transform: scale(1.3); }
.rvk-voices__fig img { width: 100%; border-radius: var(--rvk-radius-lg); object-fit: cover; max-height: 480px; }

/* Ch.09 Archive — floating islands */
.rvk-chapter--archive { text-align: center; }
.rvk-archive__head { margin-bottom: 2.5rem; }
.rvk-archive__head h2 { font-family: var(--rvk-serif); font-size: clamp(1.4rem, 3vw, 2rem); margin: 0; }
.rvk-archive__head em { font-style: normal; color: var(--rvk-copper); }
.rvk-archive__floats {
    display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.25rem;
    max-width: var(--rvk-max); margin: 0 auto 2rem; padding: 0 var(--rvk-pad);
}
.rvk-archive__island {
    position: relative;
    transform: translateY(calc(var(--float-i, 0) * 12px));
    transition: transform 0.4s var(--rvk-ease);
}
.rvk-archive__island:nth-child(even) { transform: translateY(calc(var(--float-i, 0) * -8px + 16px)); }
.rvk-archive__island:hover { transform: translateY(-8px) !important; }
.rvk-archive__link { display: block; color: inherit; text-align: left; }
.rvk-archive__img { position: relative; border-radius: var(--rvk-radius-lg); overflow: hidden; margin-bottom: 0.75rem; }
.rvk-archive__img img { width: 100%; aspect-ratio: 4/3; object-fit: cover; transition: transform 0.4s; }
.rvk-archive__island:hover .rvk-archive__img img { transform: scale(1.04); }
.rvk-archive__badge { position: absolute; top: 0.5rem; left: 0.5rem; padding: 0.2rem 0.45rem; background: var(--rvk-copper); color: var(--rvk-void); font-size: 0.6rem; font-weight: 600; border-radius: var(--rvk-radius); }
.rvk-archive__info h3 { font-family: var(--rvk-serif); font-size: 0.95rem; margin: 0 0 0.25rem; }
.rvk-archive__info p { font-size: 0.75rem; color: var(--rvk-fg-muted); margin: 0; }
.rvk-archive__add {
    position: absolute; top: 0.5rem; right: 0.5rem; width: 32px; height: 32px;
    border: 1px solid var(--rvk-border); border-radius: 50%; background: var(--rvk-bar-bg);
    font-size: 1.1rem; cursor: pointer; color: var(--rvk-copper);
    opacity: 0; transition: opacity 0.25s;
}
.rvk-archive__island:hover .rvk-archive__add { opacity: 1; }
.rvk-archive__more { margin-top: 1rem; }

/* Ch.10 Gate — conversion */
.rvk-chapter--gate { padding: 0; min-height: 90vh; }
.rvk-gate__overlap {
    display: grid; grid-template-columns: 1.1fr 0.9fr;
    min-height: 90vh; align-items: stretch;
}
.rvk-gate__fig { margin: 0; overflow: hidden; }
.rvk-gate__fig img { width: 100%; height: 100%; object-fit: cover; min-height: 400px; }
.rvk-gate__panel {
    display: flex; flex-direction: column; justify-content: center;
    padding: 3rem; background: var(--rvk-charcoal); color: var(--rvk-parchment);
}
.rvk-gate__panel h2 { font-family: var(--rvk-serif); font-size: clamp(1.5rem, 3vw, 2.2rem); margin: 0 0 1rem; }
.rvk-gate__panel em { font-style: normal; color: var(--rvk-copper-bright); }
.rvk-gate__panel > p { color: var(--rvk-mist); margin-bottom: 1.5rem; max-width: 42ch; }
.rvk-gate__actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-bottom: 1.5rem; }
.rvk-gate__trust { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 0.75rem 1.25rem; }
.rvk-gate__trust li {
    font-family: var(--rvk-mono); font-size: 0.65rem; letter-spacing: 0.08em;
    color: var(--rvk-mist); padding-left: 1rem; position: relative;
}
.rvk-gate__trust li::before { content: '◈'; position: absolute; left: 0; color: var(--rvk-copper); font-size: 0.5rem; top: 0.15rem; }

@media (max-width: 1024px) {
    .rvk-chapter-arc { display: none; }
    .rvk-manifesto__overlap, .rvk-forge__layout, .rvk-voices__wrap, .rvk-gate__overlap { grid-template-columns: 1fr; }
    .rvk-manifesto__text { margin-left: 0; margin-top: -2rem; }
    .rvk-manifesto__fig { transform: none; }
    .rvk-atelier__stage { grid-template-columns: 1fr; }
    .rvk-atelier__display { grid-template-columns: 1fr; }
    .rvk-prism__fold { grid-template-columns: 1fr; }
    .rvk-prism__panel { clip-path: none !important; }
    .rvk-archive__floats { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
    .rvk-prologue__bg { clip-path: polygon(0 0, 100% 0, 100% 55%, 0 100%); }
    .rvk-prologue__float { display: none; }
    .rvk-echo__grid { gap: 1.25rem; }
    .rvk-archive__floats { grid-template-columns: 1fr; }
    .rvk-chapter { padding-left: 1rem; padding-right: 1rem; }
}