/* Roniku.shop — Prism Chamber Redesign */

:root {
    --void: #08080d;
    --void-alt: #0f0f16;
    --void-card: #16161f;
    --void-input: #12121a;
    --text: #eeeef2;
    --text-soft: #a8a8b8;
    --text-dim: #686878;
    --violet: #9d4edd;
    --cyan: #22d3ee;
    --amber: #f59e0b;
    --rose: #f472b6;
    --accent: var(--cyan);
    --accent-hover: #67e8f9;
    --accent-dim: rgba(34, 211, 238, .12);
    --spectrum: linear-gradient(90deg, var(--violet), var(--cyan), var(--amber), var(--rose));
    --border: rgba(238, 238, 242, .08);
    --border-strong: rgba(238, 238, 242, .16);
    --shadow: 0 20px 60px rgba(0, 0, 0, .45);
    --header-h: 72px;
    --wrap: 1180px;
    --font: 'Syne', 'Hiragino Sans', sans-serif;
    --font-display: 'Fraunces', 'Hiragino Mincho ProN', serif;
    --font-mono: 'Space Mono', monospace;
    --ease: .3s cubic-bezier(.4, 0, .2, 1);
}

[data-theme="light"] {
    --void: #f0eef8;
    --void-alt: #e4e0f0;
    --void-card: #ffffff;
    --void-input: #ffffff;
    --text: #12121a;
    --text-soft: #44445a;
    --text-dim: #787890;
    --accent-dim: rgba(157, 78, 221, .1);
    --border: rgba(18, 18, 26, .1);
    --border-strong: rgba(18, 18, 26, .18);
    --shadow: 0 20px 60px rgba(0, 0, 0, .08);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }

body.rk-body {
    font-family: var(--font);
    background: var(--void);
    color: var(--text);
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
}

body.menu-open, body.search-open { overflow: hidden; }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-decoration: none; transition: color var(--ease); }
a:hover { color: var(--amber); }
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; border: none; background: none; }
ul, ol { list-style: none; }
address { font-style: normal; }

h1, h2, h3 {
    font-family: var(--font-display);
    font-weight: 600;
    line-height: 1.15;
    color: var(--text);
}

em { font-style: italic; color: var(--cyan); }

.rk-wrap {
    width: min(var(--wrap), 100% - 2.5rem);
    margin-inline: auto;
}

.rk-sr {
    position: absolute; width: 1px; height: 1px;
    overflow: hidden; clip: rect(0,0,0,0);
}

.rk-skip {
    position: absolute; top: -100px; left: 1rem;
    padding: .5rem 1rem; background: var(--cyan); color: var(--void);
    z-index: 9999; border-radius: 2px;
}
.rk-skip:focus { top: 1rem; }

.rk-label {
    font-family: var(--font-mono);
    font-size: .68rem;
    letter-spacing: .16em;
    text-transform: uppercase;
    color: var(--cyan);
    margin-bottom: .75rem;
}

.rk-h2 { font-size: clamp(1.85rem, 3.8vw, 2.75rem); margin-bottom: .5rem; }

.rk-prose h3 {
    font-family: var(--font);
    font-size: 1.05rem;
    font-weight: 600;
    margin: 1.25rem 0 .5rem;
}

.rk-prose p {
    color: var(--text-soft);
    font-size: .95rem;
    line-height: 1.8;
    margin-bottom: .85rem;
}

/* Buttons */
.rk-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: .4rem;
    padding: .85rem 1.6rem;
    font-size: .75rem;
    font-weight: 700;
    letter-spacing: .1em;
    text-transform: uppercase;
    border-radius: 2px;
    transition: all var(--ease);
}

.rk-btn--spectrum {
    background: var(--spectrum);
    color: var(--void);
    background-size: 200% 100%;
}
.rk-btn--spectrum:hover {
    background-position: 100% 0;
    color: var(--void);
    box-shadow: 0 0 30px rgba(34, 211, 238, .35);
}

.rk-btn--primary {
    background: var(--cyan);
    color: var(--void);
}
.rk-btn--primary:hover { background: var(--accent-hover); color: var(--void); }

.rk-btn--ghost {
    border: 1px solid var(--border-strong);
    color: var(--text);
}
.rk-btn--ghost:hover { border-color: var(--cyan); color: var(--cyan); }

.rk-btn--outline {
    border: 1px solid var(--cyan);
    color: var(--cyan);
}
.rk-btn--outline:hover { background: var(--accent-dim); }

.rk-btn--sm { padding: .55rem 1rem; font-size: .68rem; }
.rk-btn--lg { padding: 1rem 2rem; font-size: .78rem; }

.rk-link-arrow {
    font-family: var(--font-mono);
    font-size: .72rem;
    letter-spacing: .08em;
    text-transform: uppercase;
    color: var(--cyan);
}
.rk-link-arrow::after { content: ' →'; }

/* Logo prism */
.rk-logo {
    display: flex;
    align-items: center;
    gap: .65rem;
    color: var(--text);
}
.rk-logo:hover { color: var(--text); }

.rk-logo__prism {
    width: 28px; height: 28px;
    background: var(--spectrum);
    clip-path: polygon(50% 0%, 100% 100%, 0% 100%);
    opacity: .9;
}

.rk-logo__text {
    font-family: var(--font);
    font-size: 1.2rem;
    font-weight: 800;
    letter-spacing: .02em;
}

/* Header */
.rk-header {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: var(--header-h);
    z-index: 900;
    background: rgba(8, 8, 13, .85);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    transition: box-shadow var(--ease);
}

[data-theme="light"] .rk-header { background: rgba(240, 238, 248, .9); }
.rk-header.is-scrolled { box-shadow: var(--shadow); }

.rk-header__inner {
    width: min(var(--wrap), 100% - 2rem);
    margin-inline: auto;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.rk-nav { display: flex; gap: 2rem; }

.rk-nav__link {
    font-size: .78rem;
    font-weight: 600;
    letter-spacing: .06em;
    text-transform: uppercase;
    color: var(--text-soft);
    position: relative;
}

.rk-nav__link::after {
    content: '';
    position: absolute;
    bottom: -4px; left: 0;
    width: 0; height: 2px;
    background: var(--spectrum);
    transition: width var(--ease);
}

.rk-nav__link:hover,
.rk-nav__link.is-active { color: var(--text); }
.rk-nav__link.is-active::after,
.rk-nav__link:hover::after { width: 100%; }

.rk-header__actions { display: flex; align-items: center; gap: .4rem; }

.rk-icon-btn {
    width: 40px; height: 40px;
    display: grid; place-items: center;
    border-radius: 2px;
    color: var(--text-soft);
    position: relative;
    transition: color var(--ease), background var(--ease);
}
.rk-icon-btn:hover { color: var(--cyan); background: var(--accent-dim); }

.rk-badge {
    position: absolute;
    top: 4px; right: 4px;
    min-width: 16px; height: 16px;
    padding: 0 4px;
    font-size: .58rem;
    font-weight: 700;
    background: var(--violet);
    color: #fff;
    border-radius: 8px;
    display: grid; place-items: center;
}

.rk-burger {
    display: none;
    flex-direction: column;
    gap: 5px;
    width: 40px; height: 40px;
    align-items: center;
    justify-content: center;
}
.rk-burger span {
    width: 20px; height: 1.5px;
    background: var(--text);
}

.rk-mobile {
    position: fixed; inset: 0;
    z-index: 850;
    pointer-events: none;
    opacity: 0;
    transition: opacity var(--ease);
}
.rk-mobile.is-open { pointer-events: auto; opacity: 1; }

.rk-mobile__panel {
    position: absolute;
    top: var(--header-h); right: 0;
    width: min(320px, 100%);
    height: calc(100% - var(--header-h));
    background: var(--void-card);
    border-left: 1px solid var(--border);
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    transform: translateX(100%);
    transition: transform var(--ease);
}
.rk-mobile.is-open .rk-mobile__panel { transform: translateX(0); }

.rk-mobile__panel a {
    font-size: 1.05rem;
    color: var(--text);
    font-weight: 600;
}

.rk-mobile__meta {
    margin-top: auto;
    font-family: var(--font-mono);
    font-size: .78rem;
    color: var(--text-dim);
}

/* Search */
.rk-search {
    position: fixed; inset: 0;
    z-index: 950;
    display: grid; place-items: center;
    opacity: 0; pointer-events: none;
    transition: opacity var(--ease);
}
.rk-search.is-open { opacity: 1; pointer-events: auto; }

.rk-search__backdrop {
    position: absolute; inset: 0;
    background: rgba(0,0,0,.7);
}

.rk-search__panel {
    position: relative;
    width: min(480px, 100% - 2rem);
    background: var(--void-card);
    padding: 2rem;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
}

.rk-search__close {
    position: absolute; top: 1rem; right: 1rem;
    font-size: 1.5rem; color: var(--text-dim);
}

.rk-search form {
    display: flex; flex-direction: column; gap: 1rem;
    margin-top: 1rem;
}

.rk-search input {
    padding: .85rem 1rem;
    border: 1px solid var(--border-strong);
    background: var(--void-input);
    border-radius: 2px;
}

.rk-main { padding-top: var(--header-h); min-height: 60vh; }

/* ===== PRISM CHAMBER HOMEPAGE ===== */

.prism-chamber { overflow-x: hidden; }

.spectrum-band {
    position: relative;
    padding: clamp(4rem, 10vw, 7rem) 0;
    border-bottom: 1px solid var(--border);
}

.spectrum-band--burst {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding-top: calc(var(--header-h) + 2rem);
    background: radial-gradient(ellipse 80% 60% at 70% 40%, rgba(157, 78, 221, .15), transparent),
                radial-gradient(ellipse 60% 50% at 20% 80%, rgba(34, 211, 238, .1), transparent),
                var(--void);
}

.spectrum-band--violet { background: linear-gradient(180deg, rgba(157, 78, 221, .06) 0%, var(--void) 100%); }
.spectrum-band--cyan { background: linear-gradient(180deg, rgba(34, 211, 238, .05) 0%, var(--void) 100%); }
.spectrum-band--amber { background: linear-gradient(180deg, rgba(245, 158, 11, .05) 0%, var(--void) 100%); }
.spectrum-band--rose { background: linear-gradient(180deg, rgba(244, 114, 182, .05) 0%, var(--void) 100%); }
.spectrum-band--void { background: var(--void-alt); }
.spectrum-band--stats { padding: 3rem 0; }

.spectrum-band--cta {
    background: var(--void);
    border-bottom: none;
    position: relative;
    overflow: hidden;
}

.spectrum-band--cta::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--spectrum);
    opacity: .08;
}

.spectrum-band--cta > * { position: relative; }

/* Burst hero */
.burst-chamber {
    width: min(var(--wrap), 100% - 2.5rem);
    margin-inline: auto;
    display: grid;
    grid-template-columns: 1fr 1.1fr;
    gap: 3rem;
    align-items: center;
    position: relative;
}

@media (max-width: 900px) {
    .burst-chamber { grid-template-columns: 1fr; }
}

.burst-chamber__rays {
    position: absolute;
    top: 50%; left: 45%;
    transform: translate(-50%, -50%);
    width: 600px; height: 600px;
    pointer-events: none;
    z-index: 0;
}

.burst-ray {
    position: absolute;
    top: 50%; left: 50%;
    width: 2px; height: 280px;
    transform-origin: top center;
    opacity: .4;
    animation: rayPulse 4s ease-in-out infinite;
}

.burst-ray--violet { background: var(--violet); transform: rotate(-30deg); animation-delay: 0s; }
.burst-ray--cyan { background: var(--cyan); transform: rotate(10deg); animation-delay: .5s; }
.burst-ray--amber { background: var(--amber); transform: rotate(50deg); animation-delay: 1s; }
.burst-ray--rose { background: var(--rose); transform: rotate(90deg); animation-delay: 1.5s; }

@keyframes rayPulse {
    0%, 100% { opacity: .2; height: 240px; }
    50% { opacity: .55; height: 300px; }
}

.burst-chamber__prism {
    position: absolute;
    top: 20%; right: 15%;
    color: var(--cyan);
    opacity: .25;
    z-index: 0;
    animation: prismFloat 6s ease-in-out infinite;
}

@keyframes prismFloat {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-12px) rotate(3deg); }
}

.burst-chamber__copy { position: relative; z-index: 1; }

.burst-title__kanji {
    display: block;
    font-family: var(--font-display);
    font-size: clamp(3.5rem, 9vw, 6rem);
    line-height: 1;
    background: var(--spectrum);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    opacity: .35;
    margin-bottom: .25rem;
}

.burst-title__text {
    display: block;
    font-size: clamp(2rem, 5vw, 3.5rem);
}

.burst-lead {
    color: var(--text-soft);
    font-size: 1rem;
    line-height: 1.8;
    margin: 1.25rem 0 1.75rem;
    max-width: 48ch;
}

.burst-actions {
    display: flex;
    flex-wrap: wrap;
    gap: .75rem;
    margin-bottom: 2rem;
}

.burst-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 1.75rem;
    font-size: .82rem;
}

.burst-meta dt {
    font-family: var(--font-mono);
    font-size: .62rem;
    letter-spacing: .12em;
    text-transform: uppercase;
    color: var(--text-dim);
}

.burst-chamber__frame {
    position: relative;
    z-index: 1;
    border: 1px solid var(--border);
    overflow: hidden;
}

.burst-frame__sheen {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(157,78,221,.15), transparent 40%, rgba(34,211,238,.1));
    pointer-events: none;
}

/* Spectrum ticker */
.spectrum-ticker {
    margin-top: 3rem;
    overflow: hidden;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    padding: .85rem 0;
}

.spectrum-ticker__track {
    display: flex;
    gap: 3rem;
    animation: tickerScroll 20s linear infinite;
    width: max-content;
}

.spectrum-ticker__track span {
    font-family: var(--font-mono);
    font-size: .72rem;
    letter-spacing: .12em;
    text-transform: uppercase;
    color: var(--text-dim);
    white-space: nowrap;
}

.spectrum-ticker__track span:nth-child(4n+1) { color: var(--violet); }
.spectrum-ticker__track span:nth-child(4n+2) { color: var(--cyan); }
.spectrum-ticker__track span:nth-child(4n+3) { color: var(--amber); }
.spectrum-ticker__track span:nth-child(4n) { color: var(--rose); }

@keyframes tickerScroll {
    from { transform: translateX(0); }
    to { transform: translateX(-50%); }
}

/* Manifesto */
.manifesto-fold {
    display: grid;
    grid-template-columns: 1fr 1.4fr;
    gap: 3rem;
    align-items: start;
}

@media (max-width: 768px) {
    .manifesto-fold { grid-template-columns: 1fr; }
}

.manifesto-quote {
    margin-top: 1.5rem;
    padding-left: 1.25rem;
    border-left: 3px solid;
    border-image: var(--spectrum) 1;
}

.manifesto-quote p {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-style: italic;
    color: var(--text-soft);
    line-height: 1.75;
}

.manifesto-quote cite {
    display: block;
    margin-top: .75rem;
    font-family: var(--font-mono);
    font-size: .7rem;
    color: var(--text-dim);
    font-style: normal;
}

.manifesto-fold__body {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    align-items: start;
}

@media (max-width: 600px) {
    .manifesto-fold__body { grid-template-columns: 1fr; }
}

.manifesto-fold__img {
    border: 1px solid var(--border);
    overflow: hidden;
    position: relative;
}

.manifesto-fold__img::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(45deg, rgba(157,78,221,.12), transparent);
    pointer-events: none;
}

/* Facet prism */
.facet-header { margin-bottom: 2.5rem; max-width: 560px; }
.facet-header__sub { color: var(--text-soft); margin-top: .5rem; }

.facet-stage {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

@media (max-width: 768px) {
    .facet-stage { grid-template-columns: 1fr; }
}

.facet-prism {
    position: relative;
    width: min(320px, 100%);
    aspect-ratio: 1;
    margin-inline: auto;
}

.facet-face {
    position: absolute;
    width: 56px; height: 56px;
    display: grid; place-items: center;
    font-family: var(--font-mono);
    font-size: .85rem;
    font-weight: 700;
    border: 2px solid var(--border-strong);
    background: var(--void-card);
    color: var(--text-soft);
    border-radius: 50%;
    transition: all var(--ease);
    z-index: 2;
}

.facet-face:nth-child(1) { top: 5%; left: 50%; transform: translateX(-50%); }
.facet-face:nth-child(2) { top: 35%; right: 5%; }
.facet-face:nth-child(3) { bottom: 15%; right: 15%; }
.facet-face:nth-child(4) { bottom: 15%; left: 15%; }
.facet-face:nth-child(5) { top: 35%; left: 5%; }

.facet-face--cafe.is-active, .facet-face--cafe:hover { border-color: var(--rose); color: var(--rose); box-shadow: 0 0 20px rgba(244,114,182,.3); }
.facet-face--bobber.is-active, .facet-face--bobber:hover { border-color: var(--amber); color: var(--amber); box-shadow: 0 0 20px rgba(245,158,11,.3); }
.facet-face--scrambler.is-active, .facet-face--scrambler:hover { border-color: var(--violet); color: var(--violet); box-shadow: 0 0 20px rgba(157,78,221,.3); }
.facet-face--classic.is-active, .facet-face--classic:hover { border-color: #a3e635; color: #a3e635; box-shadow: 0 0 20px rgba(163,230,53,.3); }
.facet-face--custom.is-active, .facet-face--custom:hover { border-color: var(--cyan); color: var(--cyan); box-shadow: 0 0 20px rgba(34,211,238,.3); }

.facet-prism__core {
    position: absolute;
    inset: 20%;
    background: var(--spectrum);
    clip-path: polygon(50% 0%, 100% 100%, 0% 100%);
    opacity: .12;
    animation: corePulse 3s ease-in-out infinite;
}

@keyframes corePulse {
    0%, 100% { opacity: .08; transform: scale(1); }
    50% { opacity: .18; transform: scale(1.05); }
}

.facet-readout {
    padding: 2rem;
    background: var(--void-card);
    border: 1px solid var(--border);
    position: relative;
    overflow: hidden;
}

.facet-readout::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: var(--spectrum);
}

.facet-readout__wave {
    font-family: var(--font-mono);
    font-size: .65rem;
    letter-spacing: .12em;
    color: var(--cyan);
}

.facet-readout__label {
    display: block;
    font-family: var(--font-display);
    font-size: 1.75rem;
    margin: .5rem 0;
}

.facet-readout__spec {
    font-family: var(--font-mono);
    font-size: .78rem;
    color: var(--amber);
    margin-bottom: .75rem;
}

.facet-readout__desc {
    color: var(--text-soft);
    font-size: .9rem;
    line-height: 1.75;
    margin-bottom: 1.25rem;
}

/* Wavelength stats */
.wavelength-stats__grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1px;
    background: var(--border);
    border: 1px solid var(--border);
}

@media (max-width: 768px) {
    .wavelength-stats__grid { grid-template-columns: repeat(2, 1fr); }
}

.wave-stat {
    background: var(--void-card);
    padding: 2rem 1.5rem;
    text-align: center;
}

.wave-stat__lambda {
    display: block;
    font-family: var(--font-mono);
    font-size: .62rem;
    letter-spacing: .1em;
    color: var(--violet);
    margin-bottom: .5rem;
}

.wave-stat__num {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 3rem);
    background: var(--spectrum);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    line-height: 1;
}

.wave-stat__suffix {
    font-family: var(--font-display);
    font-size: 1.5rem;
    color: var(--cyan);
}

.wave-stat__text {
    display: block;
    margin-top: .5rem;
    font-size: .78rem;
    color: var(--text-soft);
}

/* Depth stack fleet */
.stack-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 2.5rem;
}

.depth-stack {
    position: relative;
    min-height: 480px;
    display: grid;
    place-items: center;
}

.depth-card {
    position: absolute;
    width: min(420px, 90%);
    background: var(--void-card);
    border: 1px solid var(--border);
    overflow: hidden;
    transition: transform .5s cubic-bezier(.4,0,.2,1), opacity .5s ease, z-index 0s;
    transform: translateY(calc(var(--stack-i, 0) * 12px)) scale(calc(1 - var(--stack-i, 0) * 0.04));
    opacity: calc(1 - var(--stack-i, 0) * 0.15);
    z-index: calc(10 - var(--stack-i, 0));
    pointer-events: none;
}

.depth-card.is-front {
    pointer-events: auto;
    transform: translateY(0) scale(1);
    opacity: 1;
    z-index: 20;
    box-shadow: var(--shadow);
}

.depth-card__spectrum {
    height: 3px;
    background: var(--spectrum);
}

.depth-card__link { display: block; color: var(--text); }
.depth-card__link:hover { color: var(--text); }

.depth-card__img { position: relative; aspect-ratio: 16/10; overflow: hidden; }
.depth-card__img img { width: 100%; height: 100%; object-fit: cover; }

.depth-card__badge {
    position: absolute;
    top: .75rem; left: .75rem;
    padding: .25rem .6rem;
    font-family: var(--font-mono);
    font-size: .58rem;
    letter-spacing: .06em;
    background: rgba(8,8,13,.8);
    border: 1px solid var(--border);
}

.depth-card__body { padding: 1.25rem; }

.depth-card__lambda {
    font-family: var(--font-mono);
    font-size: .6rem;
    color: var(--text-dim);
}

.depth-card__cat {
    display: block;
    font-size: .72rem;
    color: var(--cyan);
    margin: .2rem 0;
}

.depth-card__body h3 {
    font-family: var(--font);
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: .35rem;
}

.depth-card__spec { font-size: .78rem; color: var(--text-dim); }
.depth-card__price { margin-top: .5rem; font-weight: 700; color: var(--amber); }

.depth-card__add {
    position: absolute;
    bottom: 1.25rem; right: 1.25rem;
    width: 38px; height: 38px;
    background: var(--cyan);
    color: var(--void);
    font-size: 1.25rem;
    font-weight: 700;
    border-radius: 2px;
    display: grid; place-items: center;
}

.depth-stack__nav {
    position: absolute;
    bottom: -3rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 1rem;
    font-family: var(--font-mono);
    font-size: .75rem;
    color: var(--text-dim);
}

.depth-stack__btn {
    width: 44px; height: 44px;
    border: 1px solid var(--border-strong);
    color: var(--text);
    border-radius: 2px;
    transition: border-color var(--ease), color var(--ease);
}

.depth-stack__btn:hover { border-color: var(--cyan); color: var(--cyan); }

/* Wave process */
.process-header { margin-bottom: 2rem; }

.wave-process {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0;
    position: relative;
}

.wave-process::before {
    content: '';
    position: absolute;
    top: 28px; left: 5%; right: 5%;
    height: 2px;
    background: var(--spectrum);
    opacity: .4;
}

@media (max-width: 900px) {
    .wave-process { grid-template-columns: 1fr 1fr; gap: 1.5rem; }
    .wave-process::before { display: none; }
}

@media (max-width: 520px) {
    .wave-process { grid-template-columns: 1fr; }
}

.wave-process__step {
    padding: 0 1rem;
    text-align: center;
}

.wave-process__n {
    display: inline-grid;
    place-items: center;
    width: 56px; height: 56px;
    font-family: var(--font-mono);
    font-size: .75rem;
    font-weight: 700;
    border: 2px solid var(--cyan);
    border-radius: 50%;
    background: var(--void);
    color: var(--cyan);
    margin-bottom: 1rem;
    position: relative;
    z-index: 1;
}

.wave-process__step h3 {
    font-family: var(--font);
    font-size: .92rem;
    font-weight: 700;
    margin-bottom: .5rem;
}

.wave-process__step p {
    font-size: .82rem;
    color: var(--text-soft);
    line-height: 1.65;
}

/* Core prisms */
.core-prisms {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

@media (max-width: 768px) {
    .core-prisms { grid-template-columns: 1fr; }
}

.core-prism {
    padding: 2rem 1.5rem;
    background: var(--void-card);
    border: 1px solid var(--border);
    position: relative;
    overflow: hidden;
}

.core-prism::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
}

.core-prism--violet::before { background: var(--violet); }
.core-prism--cyan::before { background: var(--cyan); }
.core-prism--amber::before { background: var(--amber); }

.core-prism span {
    font-family: var(--font-mono);
    font-size: .65rem;
    letter-spacing: .1em;
    color: var(--text-dim);
}

.core-prism h3 {
    font-family: var(--font);
    font-size: 1rem;
    font-weight: 700;
    margin: .75rem 0 .5rem;
}

.core-prism p {
    font-size: .88rem;
    color: var(--text-soft);
    line-height: 1.7;
}

/* Harmonic slider */
.harmonic-slide {
    display: none;
    padding: 2.5rem;
    background: var(--void-card);
    border: 1px solid var(--border);
    position: relative;
}

.harmonic-slide.is-active { display: block; }

.harmonic-slide::before {
    content: '';
    position: absolute;
    left: 0; top: 0; bottom: 0;
    width: 4px;
    background: var(--spectrum);
}

.harmonic-slide__freq {
    font-family: var(--font-mono);
    font-size: .65rem;
    letter-spacing: .1em;
    color: var(--violet);
}

.harmonic-slide p {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-style: italic;
    line-height: 1.75;
    color: var(--text-soft);
    margin: 1rem 0;
}

.harmonic-slide cite {
    font-size: .82rem;
    color: var(--text-dim);
    font-style: normal;
}

.harmonic-slider__nav {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-top: 1rem;
    font-family: var(--font-mono);
    font-size: .75rem;
}

.harmonic-slider__btn {
    width: 40px; height: 40px;
    border: 1px solid var(--border-strong);
    color: var(--text);
    border-radius: 2px;
}

/* Chamber scan gallery */
.chamber-scan {
    display: flex;
    gap: 1rem;
    overflow-x: auto;
    padding: 0 1.25rem 1rem;
    scroll-snap-type: x mandatory;
    cursor: grab;
}

.chamber-scan figure {
    flex: 0 0 min(420px, 80vw);
    scroll-snap-align: start;
    border: 1px solid var(--border);
    overflow: hidden;
    position: relative;
}

.chamber-scan figcaption {
    position: absolute;
    bottom: 0; left: 0;
    padding: .4rem .75rem;
    font-family: var(--font-mono);
    font-size: .62rem;
    letter-spacing: .08em;
    background: rgba(8,8,13,.85);
    border-top: 1px solid var(--border);
    border-right: 1px solid var(--border);
}

/* CTA */
.spectrum-cta {
    text-align: center;
    max-width: 640px;
    padding: 2rem 0;
}

.spectrum-cta__lead {
    margin: 1rem 0 2rem;
    color: var(--text-soft);
    line-height: 1.75;
}

.spectrum-cta__actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: .75rem;
    margin-bottom: 1.5rem;
}

.spectrum-cta__note {
    font-family: var(--font-mono);
    font-size: .72rem;
    color: var(--text-dim);
}

/* Reveal animation */
[data-reveal] {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity .7s ease, transform .7s ease;
}

[data-reveal].is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== INNER PAGES ===== */

.rk-page-hero {
    padding: 4rem 0 3rem;
    background: radial-gradient(ellipse 60% 80% at 50% 0%, rgba(157,78,221,.1), transparent),
                var(--void-alt);
    border-bottom: 1px solid var(--border);
    position: relative;
}

.rk-page-hero::after {
    content: '';
    position: absolute;
    bottom: 0; left: 0; right: 0;
    height: 2px;
    background: var(--spectrum);
    opacity: .5;
}

.rk-page-hero h1 {
    font-size: clamp(2.25rem, 4.5vw, 3rem);
    margin-bottom: .75rem;
}

.rk-page-hero p { color: var(--text-soft); max-width: 56ch; }

/* Shop */
.rk-shop {
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: 2rem;
    width: min(var(--wrap), 100% - 2.5rem);
    margin: 2.5rem auto;
}

@media (max-width: 768px) {
    .rk-shop { grid-template-columns: 1fr; }
}

.rk-shop__filter {
    position: sticky;
    top: calc(var(--header-h) + 1rem);
    align-self: start;
}

.rk-shop__filter input,
.rk-shop__filter select {
    width: 100%;
    padding: .65rem .85rem;
    margin-bottom: 1.25rem;
    border: 1px solid var(--border-strong);
    background: var(--void-input);
    border-radius: 2px;
}

.rk-shop__filter h2 {
    font-family: var(--font-mono);
    font-size: .62rem;
    letter-spacing: .12em;
    text-transform: uppercase;
    color: var(--text-dim);
    margin-bottom: .65rem;
}

.rk-filter-btn {
    display: block;
    width: 100%;
    text-align: left;
    padding: .5rem .75rem;
    font-size: .85rem;
    color: var(--text-soft);
    border-left: 2px solid transparent;
    margin-bottom: .25rem;
    transition: all var(--ease);
}

.rk-filter-btn.is-active,
.rk-filter-btn:hover {
    color: var(--cyan);
    border-left-color: var(--cyan);
    background: var(--accent-dim);
}

.rk-shop__count {
    margin-top: 1rem;
    font-family: var(--font-mono);
    font-size: .72rem;
    color: var(--text-dim);
}

.rk-shop__grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.25rem;
}

.rk-shop-card {
    background: var(--void-card);
    border: 1px solid var(--border);
    overflow: hidden;
    transition: box-shadow var(--ease), border-color var(--ease);
}

.rk-shop-card:hover {
    border-color: var(--border-strong);
    box-shadow: var(--shadow);
}

.rk-shop-card__img { position: relative; aspect-ratio: 16/10; overflow: hidden; }
.rk-shop-card__img img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s ease; }
.rk-shop-card:hover .rk-shop-card__img img { transform: scale(1.04); }

.rk-shop-card__badge {
    position: absolute;
    top: .65rem; left: .65rem;
    padding: .2rem .5rem;
    font-family: var(--font-mono);
    font-size: .55rem;
    background: rgba(8,8,13,.85);
    border: 1px solid var(--border);
}

.rk-shop-card__wish {
    position: absolute;
    top: .65rem; right: .65rem;
    width: 32px; height: 32px;
    background: rgba(8,8,13,.85);
    border: 1px solid var(--border);
    display: grid; place-items: center;
    color: var(--text-dim);
}

.rk-shop-card__wish.is-active { color: var(--rose); }

.rk-shop-card__body { padding: 1.15rem; }

.rk-shop-card__id {
    font-family: var(--font-mono);
    font-size: .55rem;
    color: var(--violet);
}

.rk-shop-card__cat {
    display: block;
    font-size: .72rem;
    color: var(--cyan);
    margin: .2rem 0;
}

.rk-shop-card__body h2 {
    font-family: var(--font);
    font-size: .95rem;
    font-weight: 700;
    margin-bottom: .65rem;
}

.rk-shop-card__specs {
    font-size: .76rem;
    color: var(--text-dim);
    margin-bottom: 1rem;
}

.rk-shop-card__specs div {
    display: flex;
    justify-content: space-between;
    padding: .25rem 0;
    border-bottom: 1px solid var(--border);
}

.rk-shop-card__foot {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: .5rem;
}

.rk-shop-card__price { font-weight: 700; color: var(--amber); }

.rk-shop-empty {
    grid-column: 1 / -1;
    text-align: center;
    padding: 3rem;
    color: var(--text-dim);
}

.rk-shop-process {
    width: min(var(--wrap), 100% - 2.5rem);
    margin: 0 auto 4rem;
    padding: 2.5rem;
    background: var(--void-card);
    border: 1px solid var(--border);
    position: relative;
    overflow: hidden;
}

.rk-shop-process::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: var(--spectrum);
}

.rk-shop-process h2 { font-size: 1.35rem; margin-bottom: 1.5rem; }

.rk-shop-process ol {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.25rem;
}

@media (max-width: 768px) {
    .rk-shop-process ol { grid-template-columns: 1fr 1fr; }
}

.rk-shop-process li span {
    font-family: var(--font-mono);
    font-size: .68rem;
    color: var(--cyan);
}

.rk-shop-process h3 {
    font-family: var(--font);
    font-size: .9rem;
    font-weight: 700;
    margin: .5rem 0 .35rem;
}

.rk-shop-process p { font-size: .82rem; color: var(--text-soft); }

.rk-shop-process__note {
    margin-top: 1.5rem;
    font-size: .82rem;
    color: var(--text-dim);
}

/* About */
.rk-about-split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    width: min(var(--wrap), 100% - 2.5rem);
    margin: 3rem auto;
    align-items: center;
}

.rk-about-split--rev .rk-about-split__text { order: 2; }
.rk-about-split--rev .rk-about-split__img { order: 1; }

@media (max-width: 768px) {
    .rk-about-split { grid-template-columns: 1fr; }
    .rk-about-split--rev .rk-about-split__text,
    .rk-about-split--rev .rk-about-split__img { order: unset; }
}

.rk-about-split__text h2 { font-size: 1.5rem; margin-bottom: 1rem; }

.rk-about-split__text p {
    color: var(--text-soft);
    margin-bottom: .85rem;
    line-height: 1.75;
}

.rk-about-split__text blockquote {
    margin-top: 1rem;
    padding-left: 1rem;
    border-left: 3px solid var(--violet);
    font-family: var(--font-display);
    font-style: italic;
    color: var(--text-soft);
}

.rk-about-split__img {
    border: 1px solid var(--border);
    overflow: hidden;
    position: relative;
}

.rk-about-split__img::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(34,211,238,.08), transparent);
    pointer-events: none;
}

.rk-values {
    padding: 3rem 0;
    background: var(--void-alt);
}

.rk-values h2 {
    text-align: center;
    margin-bottom: 2rem;
    font-size: 1.5rem;
}

.rk-values__grid {
    width: min(var(--wrap), 100% - 2.5rem);
    margin-inline: auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

@media (max-width: 768px) {
    .rk-values__grid { grid-template-columns: 1fr; }
}

.rk-values__grid li {
    padding: 2rem 1.5rem;
    background: var(--void-card);
    border: 1px solid var(--border);
}

.rk-values__grid span {
    font-family: var(--font-mono);
    font-size: .62rem;
    letter-spacing: .1em;
    color: var(--violet);
}

.rk-values__grid h3 {
    font-family: var(--font);
    font-size: 1rem;
    font-weight: 700;
    margin: .75rem 0 .5rem;
}

.rk-values__grid p {
    font-size: .88rem;
    color: var(--text-soft);
    line-height: 1.7;
}

.rk-timeline {
    width: min(640px, 100% - 2.5rem);
    margin: 3rem auto;
}

.rk-timeline h2 {
    text-align: center;
    margin-bottom: 2rem;
    font-size: 1.5rem;
}

.rk-timeline ol { border-left: 2px solid; border-image: var(--spectrum) 1; padding-left: 2rem; }

.rk-timeline li { position: relative; padding-bottom: 2rem; }

.rk-timeline li::before {
    content: '';
    position: absolute;
    left: -2.45rem; top: .35rem;
    width: 10px; height: 10px;
    background: var(--cyan);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--cyan);
}

.rk-timeline__year {
    font-family: var(--font-mono);
    font-size: .72rem;
    color: var(--cyan);
}

.rk-timeline h3 {
    font-family: var(--font);
    font-size: .95rem;
    font-weight: 700;
    margin: .35rem 0;
}

.rk-timeline p { font-size: .85rem; color: var(--text-soft); }

.rk-team {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    width: min(var(--wrap), 100% - 2.5rem);
    margin: 0 auto 3rem;
    align-items: center;
}

@media (max-width: 768px) {
    .rk-team { grid-template-columns: 1fr; }
}

.rk-team img { border: 1px solid var(--border); }

.rk-about-location {
    padding: 3rem 0 4rem;
    background: var(--void-alt);
    text-align: center;
}

.rk-about-location h2 { margin-bottom: 1rem; }
.rk-about-location p { color: var(--text-soft); margin-bottom: .5rem; }
.rk-about-location .rk-btn { margin-top: 1.5rem; }

/* FAQ */
.rk-faq {
    width: min(760px, 100% - 2.5rem);
    margin: 2.5rem auto;
}

.rk-faq-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: .5rem;
    margin-bottom: 2rem;
}

.rk-faq-tab {
    padding: .55rem 1rem;
    font-size: .82rem;
    border: 1px solid var(--border);
    color: var(--text-soft);
    border-radius: 2px;
    transition: all var(--ease);
}

.rk-faq-tab.is-active {
    background: var(--spectrum);
    border-color: transparent;
    color: var(--void);
    font-weight: 700;
}

.rk-faq-panel h2 { font-size: 1.15rem; margin-bottom: 1rem; }

.rk-faq-item {
    border: 1px solid var(--border);
    margin-bottom: .5rem;
    background: var(--void-card);
}

.rk-faq-item summary {
    padding: 1rem 1.25rem;
    font-weight: 600;
    cursor: pointer;
    list-style: none;
}

.rk-faq-item summary::-webkit-details-marker { display: none; }

.rk-faq-item__a {
    padding: 0 1.25rem 1rem;
    font-size: .9rem;
    color: var(--text-soft);
    line-height: 1.75;
}

.rk-faq-cta {
    text-align: center;
    padding: 3rem 1.5rem 4rem;
    background: var(--void-alt);
}

.rk-faq-cta h2 { margin-bottom: .75rem; }
.rk-faq-cta p { color: var(--text-soft); margin-bottom: 1.5rem; }

.rk-faq-cta__actions {
    display: flex;
    justify-content: center;
    gap: .75rem;
    flex-wrap: wrap;
}

/* Contact */
.rk-contact {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 3rem;
    width: min(var(--wrap), 100% - 2.5rem);
    margin: 2.5rem auto 4rem;
}

@media (max-width: 768px) {
    .rk-contact { grid-template-columns: 1fr; }
}

.rk-contact-info h2 { margin-bottom: 1rem; font-size: 1.15rem; }

.rk-contact-info dl div {
    display: flex;
    gap: 1rem;
    padding: .5rem 0;
    font-size: .9rem;
}

.rk-contact-info dt {
    font-family: var(--font-mono);
    font-size: .62rem;
    letter-spacing: .08em;
    text-transform: uppercase;
    color: var(--text-dim);
    min-width: 60px;
}

.rk-contact-form {
    padding: 2rem;
    background: var(--void-card);
    border: 1px solid var(--border);
    position: relative;
}

.rk-contact-form::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: var(--spectrum);
}

.rk-contact-form h2 { margin-bottom: 1.5rem; font-size: 1.15rem; }

.rk-field { margin-bottom: 1.15rem; }

.rk-field label {
    display: block;
    font-size: .82rem;
    font-weight: 600;
    margin-bottom: .4rem;
}

.rk-field label span { color: var(--rose); }

.rk-field input,
.rk-field select,
.rk-field textarea {
    width: 100%;
    padding: .75rem 1rem;
    border: 1px solid var(--border-strong);
    background: var(--void-input);
    border-radius: 2px;
}

.rk-field--check label {
    display: flex;
    align-items: flex-start;
    gap: .5rem;
    font-weight: 400;
    font-size: .85rem;
}

/* Cart */
.rk-cart {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 2rem;
    width: min(var(--wrap), 100% - 2.5rem);
    margin: 2.5rem auto 4rem;
    align-items: start;
}

@media (max-width: 768px) {
    .rk-cart { grid-template-columns: 1fr; }
}

.rk-cart-empty {
    grid-column: 1 / -1;
    text-align: center;
    padding: 4rem 2rem;
    background: var(--void-card);
    border: 1px solid var(--border);
}

.rk-cart-table__head,
.rk-cart-row {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr auto;
    gap: 1rem;
    align-items: center;
    padding: 1rem;
    font-size: .85rem;
}

@media (max-width: 640px) {
    .rk-cart-table__head { display: none; }
    .rk-cart-row { grid-template-columns: 1fr; gap: .5rem; }
}

.rk-cart-table__head {
    font-family: var(--font-mono);
    font-size: .62rem;
    letter-spacing: .08em;
    text-transform: uppercase;
    color: var(--text-dim);
    border-bottom: 1px solid var(--border);
}

.rk-cart-row {
    border-bottom: 1px solid var(--border);
    background: var(--void-card);
}

.rk-cart-row__product {
    display: flex;
    align-items: center;
    gap: .75rem;
}

.rk-cart-row__product img {
    width: 72px; height: 52px;
    object-fit: cover;
    border: 1px solid var(--border);
}

.rk-cart-qty {
    display: flex;
    align-items: center;
    gap: .5rem;
}

.rk-cart-qty button {
    width: 28px; height: 28px;
    border: 1px solid var(--border-strong);
    border-radius: 2px;
}

.rk-cart-row__remove {
    font-size: 1.25rem;
    color: var(--text-dim);
}

.rk-cart-side {
    padding: 1.5rem;
    background: var(--void-card);
    border: 1px solid var(--border);
    position: sticky;
    top: calc(var(--header-h) + 1rem);
}

.rk-cart-side h2 { font-size: 1rem; margin-bottom: 1rem; }

.rk-cart-totals div {
    display: flex;
    justify-content: space-between;
    padding: .45rem 0;
    font-size: .88rem;
    color: var(--text-soft);
}

.rk-cart-totals__total {
    margin-top: .5rem;
    padding-top: .75rem;
    border-top: 1px solid var(--border);
    font-weight: 700;
    color: var(--text) !important;
}

.rk-cart-coupon { margin-top: 1.25rem; }
.rk-cart-coupon label { font-size: .78rem; font-weight: 600; }

.rk-cart-coupon__row {
    display: flex;
    gap: .5rem;
    margin-top: .4rem;
}

.rk-cart-coupon__row input {
    flex: 1;
    padding: .55rem .75rem;
    border: 1px solid var(--border-strong);
    background: var(--void-input);
}

.rk-cart-coupon__hint {
    font-size: .72rem;
    color: var(--text-dim);
    margin-top: .35rem;
}

.rk-cart-note {
    margin-top: 1rem;
    font-size: .75rem;
    color: var(--text-dim);
}

/* Legal */
.rk-legal {
    width: min(720px, 100% - 2.5rem);
    margin: 2.5rem auto 4rem;
}

.rk-legal__head {
    margin-bottom: 2.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border);
}

.rk-legal__head h1 { font-size: 2rem; margin-bottom: .5rem; }

.rk-legal__updated {
    font-family: var(--font-mono);
    font-size: .72rem;
    color: var(--text-dim);
}

.rk-legal section { margin-bottom: 2rem; }

.rk-legal h2 {
    font-family: var(--font);
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: .75rem;
}

.rk-legal p, .rk-legal li {
    font-size: .9rem;
    color: var(--text-soft);
    line-height: 1.75;
    margin-bottom: .65rem;
}

.rk-legal ul { padding-left: 1.25rem; list-style: disc; }

.rk-legal-contact {
    margin-top: 1rem;
    padding: 1.25rem;
    background: var(--void-card);
    border: 1px solid var(--border);
    font-size: .88rem;
    line-height: 1.8;
}

/* Footer */
.rk-footer {
    background: var(--void-alt);
    border-top: 1px solid var(--border);
    padding: 3rem 1.25rem 0;
    position: relative;
}

.rk-footer__spectrum {
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: var(--spectrum);
}

.rk-footer__grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
    gap: 2rem;
    width: min(var(--wrap), 100%);
    margin-inline: auto;
    padding-bottom: 2.5rem;
}

@media (max-width: 900px) {
    .rk-footer__grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 520px) {
    .rk-footer__grid { grid-template-columns: 1fr; }
}

.rk-footer__tagline {
    font-family: var(--font-display);
    font-size: 1.05rem;
    margin: .75rem 0;
}

.rk-footer__desc {
    font-size: .85rem;
    color: var(--text-soft);
    line-height: 1.65;
}

.rk-footer__col h3 {
    font-family: var(--font-mono);
    font-size: .62rem;
    letter-spacing: .12em;
    text-transform: uppercase;
    color: var(--text-dim);
    margin-bottom: 1rem;
}

.rk-footer__col ul li { margin-bottom: .45rem; }
.rk-footer__col a { font-size: .85rem; color: var(--text-soft); }
.rk-footer__col a:hover { color: var(--cyan); }

.rk-footer__contact address,
.rk-footer__contact p {
    font-size: .85rem;
    color: var(--text-soft);
    line-height: 1.7;
    margin-bottom: .35rem;
}

.rk-footer__news {
    width: min(var(--wrap), 100%);
    margin-inline: auto;
    padding: 1.5rem 0 2rem;
    border-top: 1px solid var(--border);
}

.rk-footer__news label { font-size: .82rem; font-weight: 600; }

.rk-footer__news-row {
    display: flex;
    gap: .5rem;
    margin-top: .5rem;
    max-width: 400px;
}

.rk-footer__news-row input {
    flex: 1;
    padding: .65rem 1rem;
    border: 1px solid var(--border-strong);
    background: var(--void-input);
    border-radius: 2px;
}

.rk-footer__bar {
    display: flex;
    flex-wrap: wrap;
    gap: .75rem 1.5rem;
    justify-content: space-between;
    padding: 1.25rem 0;
    border-top: 1px solid var(--border);
    width: min(var(--wrap), 100%);
    margin-inline: auto;
    font-family: var(--font-mono);
    font-size: .62rem;
    color: var(--text-dim);
}

/* Back to top & toast */
.rk-top {
    position: fixed;
    bottom: 1.5rem; right: 1.5rem;
    width: 44px; height: 44px;
    background: var(--spectrum);
    color: var(--void);
    border-radius: 2px;
    display: grid; place-items: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--ease);
    z-index: 800;
}

.rk-top.is-visible { opacity: 1; pointer-events: auto; }

.rk-toast {
    position: fixed;
    bottom: 1.5rem; left: 50%;
    transform: translateX(-50%) translateY(20px);
    padding: .75rem 1.5rem;
    background: var(--void-card);
    color: var(--text);
    font-size: .85rem;
    border: 1px solid var(--border);
    border-top: 2px solid var(--cyan);
    border-radius: 2px;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--ease), transform var(--ease);
    z-index: 9999;
}

.rk-toast.is-visible {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

@media (max-width: 900px) {
    .rk-nav { display: none; }
    .rk-burger { display: flex; }
}