/* =====================================================================
   SSETTL.com — Y2K-futurism mysterious-moody, Z-pattern, leather texture
   Monochrome + single warm leather accent. Spring physics everywhere.
   Typography provenance: Space Grotesk" (Google Fonts, Inter" (Google Fonts,
   IBM Plex Mono" (Google Fonts. Interaction* Interaction:** Interactive Blobs* Blobs:** Smaller
   (40–80px. IntersectionObserver threshold 0.15. Each successive element in
   a group is staggered by 80ms; secondary descriptor floats at the upper-right
   terminus. Between them Space Grotesk. Used for subheadings.
   ===================================================================== */

:root {
    --void-black: #0d0d0d;
    --obsidian: #1a1a1a;
    --graphite: #2e2e2e;
    --graphite-2: #222222;
    --pewter: #6b6b6b;
    --silver: #b0b0b0;
    --bone: #e8e8e8;
    --porcelain: #f0f0f0;
    --leather: #8a7e72;
    --pewter-2: #888888;
    --rule: #d0d0d0;

    /* Springs */
    --spring-overshoot: cubic-bezier(0.175, 0.885, 0.32, 1.275);
    --spring-damped: cubic-bezier(0.45, 0.05, 0.55, 0.95);
    --spring-soft: cubic-bezier(0.25, 0.8, 0.35, 1);

    /* Type */
    --display: 'Space Grotesk', 'Inter', system-ui, sans-serif;
    --subdisplay: 'DM Sans', 'Inter', system-ui, sans-serif;
    --body: 'Inter', system-ui, sans-serif;
    --mono: 'IBM Plex Mono', ui-monospace, monospace;
}

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

html, body {
    background: var(--void-black);
    color: var(--silver);
    font-family: var(--body);
    font-weight: 300;
    line-height: 1.7;
    overflow-x: hidden;
    min-height: 100%;
    scroll-behavior: smooth;
}

body {
    scroll-snap-type: y proximity;
    background:
        radial-gradient(ellipse at 15% 10%, rgba(46,46,46,0.55) 0%, transparent 45%),
        radial-gradient(ellipse at 85% 90%, rgba(46,46,46,0.4) 0%, transparent 45%),
        var(--void-black);
    min-height: 100vh;
    position: relative;
}

/* --- Ambient floating blobs ------------------------------------------ */
.ambient-blob {
    position: fixed;
    width: 480px;
    height: 480px;
    pointer-events: none;
    opacity: 0.55;
    filter: blur(0.3px);
    z-index: 0;
}
.ambient-blob-a {
    top: -80px;
    right: -120px;
    animation: drift-a 22s var(--spring-damped) infinite alternate;
}
.ambient-blob-b {
    bottom: -120px;
    left: -140px;
    width: 560px; height: 560px;
    opacity: 0.4;
    animation: drift-b 28s var(--spring-damped) infinite alternate;
}
@keyframes drift-a {
    0%   { transform: translate(0,0) scale(1) rotate(0deg); }
    50%  { transform: translate(-40px, 60px) scale(1.08) rotate(12deg); }
    100% { transform: translate(30px, 30px) scale(0.95) rotate(-8deg); }
}
@keyframes drift-b {
    0%   { transform: translate(0,0) scale(1) rotate(0deg); }
    50%  { transform: translate(60px, -30px) scale(0.92) rotate(-10deg); }
    100% { transform: translate(-20px, 40px) scale(1.1) rotate(14deg); }
}

/* --- Ghost metadata line --------------------------------------------- */
.ghost-metadata {
    position: fixed;
    top: 22px;
    right: 24px;
    z-index: 3;
    font-family: var(--mono);
    font-size: 0.65rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--pewter-2);
    text-align: right;
    display: flex;
    flex-direction: column;
    gap: 4px;
    opacity: 0.7;
    mix-blend-mode: screen;
}
.ghost-line { display: block; }

/* --- Tier layout (Z-pattern) ----------------------------------------- */
.tier {
    position: relative;
    padding: clamp(4rem, 10vh, 10rem) clamp(1.5rem, 6vw, 7rem);
    min-height: 92vh;
    scroll-snap-align: start;
    z-index: 1;
    overflow: hidden;
}

.tier-inner {
    position: relative;
    max-width: 1600px;
    margin: 0 auto;
    width: 100%;
    display: grid;
    gap: clamp(2rem, 5vh, 6rem);
}

/* Tier 1 - Entry (top-left headline + top-right tagline + diagonal) */
.tier-one .tier-inner {
    grid-template-columns: 1.2fr 1fr;
    align-items: flex-start;
    min-height: 80vh;
}
.brand-cluster {
    position: relative;
    padding-top: clamp(1rem, 3vh, 3rem);
}
.brand-cluster.narrow { max-width: 640px; }

.label-row {
    margin-bottom: clamp(1.2rem, 2.5vh, 2rem);
}
.mono-label {
    font-family: var(--mono);
    font-weight: 300;
    font-size: 0.72rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--pewter-2);
}
.mono-label.subtle { color: var(--pewter); opacity: 0.8; }

.brand-mark {
    font-family: var(--display);
    font-weight: 700;
    font-size: clamp(2.5rem, 12vw, 10rem);
    letter-spacing: -0.03em;
    line-height: 0.95;
    color: var(--bone);
    display: flex;
    gap: 0;
}
.bm-letter {
    display: inline-block;
    transform: translateY(-20px);
    opacity: 0;
    transition:
        transform 600ms var(--spring-overshoot),
        opacity 600ms var(--spring-damped);
    transition-delay: calc(200ms + var(--i) * 80ms);
}
.brand-mark.is-in .bm-letter { transform: translateY(0); opacity: 1; }

.hr-row {
    margin-top: clamp(1.5rem, 3vh, 2.5rem);
    width: 100%;
    max-width: 100%;
}
.spring-rule {
    height: 1px;
    width: 0%;
    background: linear-gradient(90deg, transparent 0%, var(--pewter) 10%, var(--rule) 50%, var(--pewter) 90%, transparent 100%);
    transition: width 900ms var(--spring-overshoot);
    transition-delay: 700ms;
    box-shadow: 0 0 0 0 #d0d0d0;
}
.spring-rule.is-in { width: 100%; }

.tagline-cluster {
    padding-top: clamp(3rem, 10vh, 9rem);
    padding-left: clamp(1rem, 4vw, 3rem);
    max-width: 520px;
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
    transform: translateY(30px);
    opacity: 0;
    transition:
        transform 700ms var(--spring-overshoot),
        opacity 700ms var(--spring-damped);
    transition-delay: 900ms;
}
.tagline-cluster.is-in { transform: translateY(0); opacity: 1; }
.tagline-cluster.right-align { margin-left: auto; text-align: right; }

.tagline {
    font-family: var(--subdisplay);
    font-weight: 400;
    font-size: clamp(1rem, 1.5vw, 1.25rem);
    line-height: 1.55;
    color: var(--silver);
    letter-spacing: -0.005em;
}
.sig-line {
    font-family: var(--mono);
    font-size: 0.72rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--pewter);
}

/* --- Leather diagonal band ------------------------------------------ */
.leather-diagonal {
    position: absolute;
    top: 50%;
    left: -10%;
    width: 130%;
    height: 140px;
    transform: translateY(-50%) rotate(-25deg);
    transform-origin: center;
    overflow: hidden;
    pointer-events: auto;
    --cursor-x: 50%;
    --cursor-y: 50%;
    box-shadow:
        0 0 60px rgba(0,0,0,0.8),
        inset 0 1px 0 rgba(138,126,114,0.18),
        inset 0 -1px 0 rgba(0,0,0,0.9);
    z-index: 0;
}
.leather-diagonal.reverse {
    transform: translateY(-50%) rotate(25deg);
}
.leather-surface {
    position: absolute; inset: 0;
    background:
        radial-gradient(ellipse at var(--cursor-x) var(--cursor-y), rgba(138,126,114,0.22) 0%, transparent 55%),
        radial-gradient(ellipse at 30% 40%, #2e2e2e 0%, transparent 60%),
        radial-gradient(ellipse at 70% 70%, #1a1a1a 0%, transparent 50%),
        repeating-conic-gradient(from 0deg at 50% 50%, var(--obsidian) 0deg, var(--graphite-2) 1deg, var(--obsidian) 2deg);
    background-size: 100% 100%, 100% 100%, 100% 100%, 2px 2px;
    filter: contrast(1.3) brightness(0.9);
    mix-blend-mode: normal;
}
.leather-surface::after {
    content: "";
    position: absolute; inset: 0;
    background: linear-gradient(180deg, rgba(138,126,114,0.18) 0%, transparent 30%, transparent 70%, rgba(0,0,0,0.6) 100%);
    mix-blend-mode: overlay;
}
.leather-emboss {
    position: absolute; inset: 0;
    background:
        repeating-linear-gradient(90deg, rgba(255,255,255,0.03) 0 1px, transparent 1px 8px),
        repeating-linear-gradient(0deg, rgba(0,0,0,0.2) 0 1px, transparent 1px 14px);
    mix-blend-mode: overlay;
    opacity: 0.7;
}
.band-mono {
    position: absolute;
    left: 0; right: 0; top: 50%;
    transform: translateY(-50%);
    font-family: var(--mono);
    font-size: 0.7rem;
    letter-spacing: 0.4em;
    text-transform: uppercase;
    color: rgba(232,232,232,0.55);
    white-space: nowrap;
    text-align: center;
    text-shadow: 0 1px 0 rgba(0,0,0,0.8), 0 -1px 0 rgba(138,126,114,0.15);
    user-select: none;
}

/* Texture class reused for divider bands */
.leather-texture {
    background:
        radial-gradient(ellipse at 30% 40%, #2e2e2e 0%, transparent 60%),
        repeating-conic-gradient(from 0deg at 50% 50%, var(--obsidian) 0deg, var(--graphite-2) 1deg, var(--obsidian) 2deg);
    background-size: 100% 100%, 2px 2px;
    filter: contrast(1.3) brightness(0.9);
    position: relative;
}
.leather-texture::after {
    content: "";
    position: absolute; inset: 0;
    background: linear-gradient(180deg, rgba(138,126,114,0.15) 0%, transparent 50%, rgba(0,0,0,0.6) 100%);
    mix-blend-mode: overlay;
}

/* --- Section divider band with blob cutout --------------------------- */
.section-divider {
    position: relative;
    height: 60px;
    width: 100%;
    z-index: 1;
    overflow: hidden;
}
.divider-band {
    position: absolute; inset: 0;
    z-index: 1;
}
.divider-blob {
    position: absolute;
    left: 50%;
    top: 50%;
    width: 220px; height: 66px;
    transform: translate(-50%, -50%);
    z-index: 2;
    filter: drop-shadow(0 0 12px rgba(13,13,13,0.9));
    animation: blob-breath 10s var(--spring-damped) infinite alternate;
}
@keyframes blob-breath {
    0% { transform: translate(-50%, -50%) scale(1) rotate(0deg); }
    100% { transform: translate(-50%, -50%) scale(1.06) rotate(3deg); }
}

/* --- Two-column tier layout ------------------------------------------ */
.two-col {
    grid-template-columns: 40fr 55fr;
    gap: 5%;
    align-items: center;
    min-height: 70vh;
}
.two-col.reverse { grid-template-columns: 55fr 40fr; }
.col {
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
    position: relative;
}
.col.col-left { align-items: flex-start; }
.two-col.reverse .col.col-left.textual { padding-right: 2rem; }
.col.col-right { align-items: flex-start; }
.two-col:not(.reverse) .col.col-right { padding-left: 1.5rem; }

.org-blob {
    width: 100%;
    max-width: 420px;
    height: auto;
    filter: drop-shadow(0 10px 40px rgba(0,0,0,0.6));
    transform: translateY(40px);
    opacity: 0;
    transition: transform 900ms var(--spring-overshoot), opacity 900ms var(--spring-damped);
}
.col.col-left .org-blob { transform: translate(-40px, 0); }
.col.col-right .org-blob { transform: translate(40px, 0); }
.is-in .org-blob { transform: translate(0,0) !important; opacity: 1; }

.blob-caption {
    margin-top: -0.5rem;
    padding-left: 0.2rem;
}

.section-head {
    font-family: var(--display);
    font-weight: 500;
    font-size: clamp(1.5rem, 3.3vw, 2.75rem);
    line-height: 1.15;
    letter-spacing: -0.025em;
    color: var(--bone);
    max-width: 24ch;
}
.section-head.indent { padding-left: clamp(1rem, 4vw, 3rem); }

.body-prose {
    font-family: var(--body);
    font-weight: 300;
    font-size: clamp(1rem, 1.1vw, 1.125rem);
    color: var(--silver);
    max-width: 56ch;
}
.body-prose em {
    color: var(--bone);
    font-style: italic;
    font-weight: 400;
}
.body-prose.muted { color: var(--pewter); }
.body-prose.small { font-size: 0.9rem; }

/* Content reveal */
.col, .brand-cluster.narrow, .tagline-cluster, .spec-list, .foot-col {
    opacity: 0;
    transform: translateY(40px);
    transition:
        transform 800ms var(--spring-overshoot),
        opacity 800ms var(--spring-damped);
}
.tier-two .col.col-left { transform: translate(-50px, 40px); }
.tier-two .col.col-right { transform: translate(50px, 40px); }
.tier-three .col.col-left { transform: translate(-50px, 40px); }
.tier-three .col.col-right { transform: translate(50px, 40px); }

.is-in > .col,
.is-in > * > .col,
.is-in .brand-cluster.narrow,
.is-in .tagline-cluster,
.is-in .spec-list,
.is-in .foot-col,
.col.is-in,
.brand-cluster.narrow.is-in,
.tagline-cluster.is-in,
.spec-list.is-in,
.foot-col.is-in {
    opacity: 1;
    transform: translate(0, 0);
}

.col.is-in + .col.is-in { transition-delay: 120ms; }

.spec-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    border-top: 1px solid var(--graphite);
    padding-top: 1.1rem;
    margin-top: 0.8rem;
    max-width: 56ch;
}
.spec-list li {
    display: grid;
    grid-template-columns: 130px 1fr;
    gap: 1rem;
    align-items: baseline;
    padding: 0.35rem 0;
    border-bottom: 1px solid rgba(46,46,46,0.6);
}
.spec-val {
    font-family: var(--subdisplay);
    font-weight: 400;
    font-size: 0.95rem;
    color: var(--bone);
    letter-spacing: -0.005em;
}

/* Tier four */
.tier-four .tier-inner {
    grid-template-columns: 1fr 1fr;
    min-height: 70vh;
    align-items: center;
}
.tier-four .tagline-cluster {
    padding-top: 0;
    padding-left: 0;
    margin-left: auto;
    max-width: 440px;
}

/* Tier five - footer */
.tier-five { min-height: 40vh; }
.footer-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: clamp(1.5rem, 3vw, 3rem);
    border-top: 1px solid var(--graphite);
    padding-top: clamp(2rem, 5vh, 4rem);
}
.foot-col { display: flex; flex-direction: column; gap: 0.6rem; }
.foot-col.mark { align-items: flex-end; text-align: right; }
.foot-mark {
    font-family: var(--display);
    font-weight: 700;
    font-size: clamp(1.5rem, 3vw, 2.25rem);
    color: var(--bone);
    letter-spacing: -0.03em;
}

/* --- Corner navigation blob ------------------------------------------ */
.corner-nav {
    position: fixed;
    right: 32px;
    bottom: 32px;
    width: 80px;
    height: 80px;
    z-index: 50;
}
.nav-blob {
    width: 100%;
    height: 100%;
    filter: drop-shadow(0 6px 20px rgba(0,0,0,0.8));
    animation: nav-pulse 3.5s var(--spring-damped) infinite alternate;
    transition: transform 400ms var(--spring-overshoot);
    cursor: pointer;
}
.nav-ring {
    opacity: 0;
    transition: opacity 400ms var(--spring-damped);
}
@keyframes nav-pulse {
    0%   { transform: scale(1) rotate(0deg); }
    100% { transform: scale(1.08) rotate(6deg); }
}

.corner-nav:hover .nav-blob {
    transform: scale(1.3);
    animation-play-state: paused;
}
.corner-nav:hover .nav-ring { opacity: 1; }

.nav-labels {
    position: absolute;
    left: 40px;
    top: 40px;
    list-style: none;
    width: 0; height: 0;
    pointer-events: none;
}
.nav-label {
    position: absolute;
    left: 0; top: 0;
    display: flex;
    align-items: center;
    gap: 8px;
    white-space: nowrap;
    font-family: var(--subdisplay);
    font-weight: 500;
    font-size: 0.78rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--silver);
    opacity: 0;
    transform: translate(0, 0) scale(0.7);
    transform-origin: left center;
    transition:
        opacity 400ms var(--spring-damped),
        transform 500ms var(--spring-overshoot),
        color 200ms ease;
    cursor: pointer;
    pointer-events: auto;
}
.nav-line {
    display: inline-block;
    width: 36px; height: 1px;
    background: linear-gradient(90deg, var(--leather), transparent);
    transform-origin: left center;
    transform: scaleX(0);
    transition: transform 500ms var(--spring-damped);
}
.nav-text {
    padding: 4px 10px;
    background: rgba(13,13,13,0.75);
    border: 1px solid var(--graphite);
    backdrop-filter: blur(6px);
}

/* Radial arrangement on hover */
.corner-nav:hover .nav-label {
    opacity: 1;
    pointer-events: auto;
}
.corner-nav:hover .nav-label .nav-line { transform: scaleX(1); }

.corner-nav .nav-label:nth-child(1) {
    transform: translate(-180px, -200px) scale(0.7);
    transition-delay: 0ms;
}
.corner-nav .nav-label:nth-child(2) {
    transform: translate(-230px, -120px) scale(0.7);
    transition-delay: 50ms;
}
.corner-nav .nav-label:nth-child(3) {
    transform: translate(-260px, -30px) scale(0.7);
    transition-delay: 100ms;
}
.corner-nav .nav-label:nth-child(4) {
    transform: translate(-230px, 60px) scale(0.7);
    transition-delay: 150ms;
}
.corner-nav .nav-label:nth-child(5) {
    transform: translate(-180px, 140px) scale(0.7);
    transition-delay: 200ms;
}
.corner-nav:hover .nav-label:nth-child(1) { transform: translate(-180px, -200px) scale(1); }
.corner-nav:hover .nav-label:nth-child(2) { transform: translate(-230px, -120px) scale(1); }
.corner-nav:hover .nav-label:nth-child(3) { transform: translate(-260px, -30px) scale(1); }
.corner-nav:hover .nav-label:nth-child(4) { transform: translate(-230px, 60px) scale(1); }
.corner-nav:hover .nav-label:nth-child(5) { transform: translate(-180px, 140px) scale(1); }

.nav-label:hover .nav-text {
    color: var(--porcelain);
    border-color: var(--leather);
}
.nav-label.pulse .nav-text {
    animation: label-pulse 600ms var(--spring-overshoot);
}
@keyframes label-pulse {
    0%   { box-shadow: 0 0 0 0 rgba(138,126,114,0.7); }
    50%  { box-shadow: 0 0 0 8px rgba(138,126,114,0); color: var(--leather); }
    100% { box-shadow: 0 0 0 0 rgba(138,126,114,0); }
}

/* --- Vignette + grain ----------------------------------------------- */
.vignette {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 40;
    background:
        radial-gradient(ellipse at 50% 50%, transparent 55%, rgba(0,0,0,0.6) 100%);
}
.grain {
    position: fixed;
    inset: -10%;
    pointer-events: none;
    z-index: 41;
    opacity: 0.08;
    mix-blend-mode: overlay;
    background-image:
        repeating-conic-gradient(from 0deg at 50% 50%, rgba(255,255,255,0.02) 0deg, rgba(0,0,0,0.04) 0.5deg, rgba(255,255,255,0.02) 1deg);
    background-size: 3px 3px;
    animation: grain-shift 1.2s steps(6) infinite;
}
@keyframes grain-shift {
    0%   { transform: translate(0,0); }
    20%  { transform: translate(-2px, 1px); }
    40%  { transform: translate(1px, -2px); }
    60%  { transform: translate(-1px, 2px); }
    80%  { transform: translate(2px, 0); }
    100% { transform: translate(0,0); }
}

/* --- Responsive ------------------------------------------------------ */
@media (max-width: 960px) {
    .tier-one .tier-inner { grid-template-columns: 1fr; }
    .two-col, .two-col.reverse { grid-template-columns: 1fr; }
    .tier-four .tier-inner { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .leather-diagonal { height: 90px; }
    .tagline-cluster { padding-top: 2rem; padding-left: 0; }
    .tagline-cluster.right-align { margin-left: 0; text-align: left; }
    .foot-col.mark { align-items: flex-start; text-align: left; }
    .ghost-metadata { font-size: 0.55rem; }
    .corner-nav:hover .nav-label:nth-child(1) { transform: translate(-140px, -160px) scale(1); }
    .corner-nav:hover .nav-label:nth-child(2) { transform: translate(-180px, -90px) scale(1); }
    .corner-nav:hover .nav-label:nth-child(3) { transform: translate(-200px, -20px) scale(1); }
    .corner-nav:hover .nav-label:nth-child(4) { transform: translate(-180px, 50px) scale(1); }
    .corner-nav:hover .nav-label:nth-child(5) { transform: translate(-140px, 120px) scale(1); }
}

@media (max-width: 600px) {
    .footer-grid { grid-template-columns: 1fr; }
    .brand-mark { font-size: clamp(3rem, 18vw, 6rem); }
    .ghost-metadata { display: none; }
    .corner-nav { right: 16px; bottom: 16px; width: 64px; height: 64px; }
}

/* --- Reduced motion -------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    .bm-letter { transform: none; opacity: 1; }
    .spring-rule { width: 100%; }
    .col, .tagline-cluster, .brand-cluster.narrow, .spec-list, .foot-col, .org-blob {
        opacity: 1 !important;
        transform: none !important;
    }
}