/* =====================================================
   iisugi.com — a minimalist time capsule
   cool twilight / art-deco / bokeh
   ===================================================== */

:root {
    /* Palette from DESIGN.md */
    --ink-dusk:        #1e1b2e;  /* bg primary */
    --ink-dusk-warm:   #2a1e2e;  /* bg primary, warmer (final) */
    --moth-wing:       #2a2640;  /* bg secondary */
    --silver-ash:      #d4d0e0;  /* text primary */
    --pewter-haze:     #8a849e;  /* text secondary */
    --wisteria-fade:   #9b8ec4;  /* accent primary */
    --burnished-rose:  #c4908e;  /* accent secondary */
    --celadon-whisper: #7a9e8c;  /* accent tertiary */

    --grid-line-color: #565370; /* exposed ghost grid-line stroke */
    --grid-line-opacity: 0.12;

    /* Fonts */
    --ff-display: "Poiret One", "Josefin Sans", serif;
    --ff-sans:    "Josefin Sans", "Inter", sans-serif;
    --ff-body:    "Libre Baskerville", "Lora", Georgia, serif;

    /* Motion */
    --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);

    /* Grid */
    --col-count: 12;
    --gutter: 40px;
    --page-pad: clamp(24px, 5vw, 96px);
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    background: var(--ink-dusk);
}

body {
    font-family: var(--ff-body);
    font-weight: 400;
    color: var(--silver-ash);
    line-height: 1.85;
    /* background transitions from cool to warm as --scroll-progress changes */
    background:
        color-mix(in oklab,
            var(--ink-dusk) calc(100% - var(--scroll-progress, 0%) * 1),
            var(--ink-dusk-warm) calc(var(--scroll-progress, 0%) * 1));
    background-color: var(--ink-dusk);
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    position: relative;
}

/* Fallback continuous background using CSS variable */
body {
    background:
        linear-gradient(
            180deg,
            var(--ink-dusk) 0%,
            #251c2e 50%,
            var(--ink-dusk-warm) 100%
        ) fixed;
}

/* =====================================================
   Bokeh layer
   ===================================================== */

.bokeh-layer {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.bokeh {
    position: absolute;
    display: block;
    border-radius: 50%;
    filter: blur(40px);
    opacity: 0;
    will-change: transform, opacity;
    transition: opacity 1200ms var(--ease-out-expo);
    mix-blend-mode: screen;
}

.bokeh.is-in { opacity: var(--bokeh-opacity, 0.08); }

.bokeh--1 { width: 280px; height: 280px; background: #9b8ec4; --bokeh-opacity: 0.10; top: 8%;  left: 62%; animation: drift1 22s ease-in-out infinite; }
.bokeh--2 { width: 220px; height: 220px; background: #c4908e; --bokeh-opacity: 0.08; top: 18%; left: 18%; animation: drift2 18s ease-in-out infinite; }
.bokeh--3 { width: 180px; height: 180px; background: #7a9e8c; --bokeh-opacity: 0.07; top: 36%; left: 78%; animation: drift3 25s ease-in-out infinite; }
.bokeh--4 { width: 140px; height: 140px; background: #d4d0e0; --bokeh-opacity: 0.05; top: 46%; left: 28%; animation: drift4 20s ease-in-out infinite; }
.bokeh--5 { width: 260px; height: 260px; background: #9b8ec4; --bokeh-opacity: 0.06; top: 60%; left: 70%; animation: drift5 23s ease-in-out infinite; }
.bokeh--6 { width: 120px; height: 120px; background: #c4908e; --bokeh-opacity: 0.09; top: 72%; left: 12%; animation: drift6 19s ease-in-out infinite; }
.bokeh--7 { width: 200px; height: 200px; background: #9b8ec4; --bokeh-opacity: 0.06; top: 84%; left: 58%; animation: drift7 21s ease-in-out infinite; }
.bokeh--8 { width: 100px; height: 100px; background: #7a9e8c; --bokeh-opacity: 0.10; top: 26%; left: 46%; animation: drift8 17s ease-in-out infinite; }
.bokeh--9 { width: 300px; height: 300px; background: #9b8ec4; --bokeh-opacity: 0.04; top: 92%; left: 32%; animation: drift9 24s ease-in-out infinite; }
.bokeh--10{ width:  90px; height:  90px; background: #d4d0e0; --bokeh-opacity: 0.12; top: 14%; left: 88%; animation: drift10 16s ease-in-out infinite; }

@keyframes drift1  { 0%,100%{ transform:translate3d(0,0,0);} 50%{ transform:translate3d(-30px,20px,0);} }
@keyframes drift2  { 0%,100%{ transform:translate3d(0,0,0);} 50%{ transform:translate3d(25px,-15px,0);} }
@keyframes drift3  { 0%,100%{ transform:translate3d(0,0,0);} 50%{ transform:translate3d(-20px,-25px,0);} }
@keyframes drift4  { 0%,100%{ transform:translate3d(0,0,0);} 50%{ transform:translate3d(35px,10px,0);} }
@keyframes drift5  { 0%,100%{ transform:translate3d(0,0,0);} 50%{ transform:translate3d(-40px,25px,0);} }
@keyframes drift6  { 0%,100%{ transform:translate3d(0,0,0);} 50%{ transform:translate3d(20px,-30px,0);} }
@keyframes drift7  { 0%,100%{ transform:translate3d(0,0,0);} 50%{ transform:translate3d(-25px,15px,0);} }
@keyframes drift8  { 0%,100%{ transform:translate3d(0,0,0);} 50%{ transform:translate3d(30px,20px,0);} }
@keyframes drift9  { 0%,100%{ transform:translate3d(0,0,0);} 50%{ transform:translate3d(-35px,-20px,0);} }
@keyframes drift10 { 0%,100%{ transform:translate3d(0,0,0);} 50%{ transform:translate3d(15px,28px,0);} }

/* =====================================================
   Grid scaffolding
   ===================================================== */

.grid-scaffold {
    position: fixed;
    top: 0;
    left: var(--page-pad);
    right: var(--page-pad);
    bottom: 0;
    pointer-events: none;
    z-index: 1;
    display: grid;
    grid-template-columns: repeat(11, 1fr);
}

.grid-scaffold .grid-line {
    display: block;
    height: 100%;
    width: 1px;
    background: var(--grid-line-color);
    opacity: 0;
    transform-origin: top center;
    transform: scaleY(0);
    transition: transform 900ms var(--ease-out-expo), opacity 900ms var(--ease-out-expo);
}

.grid-scaffold.is-lit .grid-line {
    opacity: var(--grid-line-opacity);
    transform: scaleY(1);
}

.grid-scaffold .grid-line:nth-child(1)  { transition-delay:   0ms; }
.grid-scaffold .grid-line:nth-child(2)  { transition-delay:  80ms; }
.grid-scaffold .grid-line:nth-child(3)  { transition-delay: 160ms; }
.grid-scaffold .grid-line:nth-child(4)  { transition-delay: 240ms; }
.grid-scaffold .grid-line:nth-child(5)  { transition-delay: 320ms; }
.grid-scaffold .grid-line:nth-child(6)  { transition-delay: 400ms; }
.grid-scaffold .grid-line:nth-child(7)  { transition-delay: 480ms; }
.grid-scaffold .grid-line:nth-child(8)  { transition-delay: 560ms; }
.grid-scaffold .grid-line:nth-child(9)  { transition-delay: 640ms; }
.grid-scaffold .grid-line:nth-child(10) { transition-delay: 720ms; }
.grid-scaffold .grid-line:nth-child(11) { transition-delay: 800ms; }

/* =====================================================
   Stack / Chambers
   ===================================================== */

.stack {
    position: relative;
    z-index: 2;
}

.chamber {
    position: relative;
    min-height: 100vh;
    padding: clamp(80px, 12vh, 160px) var(--page-pad) clamp(80px, 10vh, 140px);
    display: flex;
    align-items: center;
    isolation: isolate;
}

.chamber__inner {
    position: relative;
    width: 100%;
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: 0 var(--gutter);
}

/* Compositions — left / center / right */
.compose--left   { grid-column: 1 / span 6; }
.compose--center { grid-column: 4 / span 6; text-align: center; }
.compose--right  { grid-column: 7 / span 6; text-align: right; }

@media (max-width: 900px) {
    :root { --gutter: 24px; }
    .compose--left, .compose--center, .compose--right {
        grid-column: 1 / -1;
        text-align: left;
    }
}

.right-gutter {
    grid-column: 10 / span 3;
    display: flex;
    flex-direction: column;
    gap: 60px;
    align-items: flex-end;
    justify-content: space-between;
    padding-top: 40px;
}

@media (max-width: 900px) {
    .right-gutter { display: none; }
}

.endcap {
    width: 14px;
    height: 14px;
    fill: var(--wisteria-fade);
    opacity: 0;
    transform: scale(0.5);
    transition: opacity 600ms var(--ease-out-expo), transform 600ms var(--ease-out-expo);
}

.chamber.is-seen .endcap {
    opacity: 0.32;
    transform: scale(1);
    transition-delay: 400ms;
}

.chamber.is-seen .endcap--diamond { transition-delay: 600ms; }

/* =====================================================
   Typography
   ===================================================== */

.eyebrow {
    font-family: var(--ff-sans);
    font-weight: 100;
    font-size: clamp(0.72rem, 1.1vw, 0.85rem);
    letter-spacing: 0.32em;
    text-transform: uppercase;
    color: var(--pewter-haze);
    display: inline-block;
    margin-bottom: clamp(24px, 4vh, 48px);
}

.eyebrow--absolute {
    position: absolute;
    top: 0;
    left: 0;
    grid-column: 1 / -1;
}

.hero-title {
    font-family: var(--ff-display);
    font-weight: 400;
    font-size: clamp(3rem, 11vw, 9rem);
    letter-spacing: 0.15em;
    line-height: 0.95;
    margin: 0 0 12px;
    color: var(--silver-ash);
    display: flex;
    gap: 0.04em;
}

.hero-letter {
    display: inline-block;
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 900ms var(--ease-out-expo), transform 900ms var(--ease-out-expo);
}

.hero-title.is-lit .hero-letter { opacity: 1; transform: translateY(0); }

.hero-title.is-lit .hero-letter:nth-child(1) { transition-delay:   0ms; }
.hero-title.is-lit .hero-letter:nth-child(2) { transition-delay: 120ms; }
.hero-title.is-lit .hero-letter:nth-child(3) { transition-delay: 240ms; }
.hero-title.is-lit .hero-letter:nth-child(4) { transition-delay: 360ms; }
.hero-title.is-lit .hero-letter:nth-child(5) { transition-delay: 480ms; }
.hero-title.is-lit .hero-letter:nth-child(6) { transition-delay: 600ms; }

.hero-tld {
    display: inline-block;
    font-family: var(--ff-sans);
    font-weight: 100;
    font-size: clamp(0.85rem, 1.3vw, 1rem);
    letter-spacing: 0.3em;
    color: var(--wisteria-fade);
    opacity: 0;
    transition: opacity 1000ms var(--ease-out-expo);
    transition-delay: 1000ms;
    margin-bottom: clamp(28px, 5vh, 56px);
}

.hero-title.is-lit ~ .hero-tld,
.compose--left.is-lit .hero-tld { opacity: 1; }

.lede {
    font-family: var(--ff-body);
    font-size: clamp(1.05rem, 1.6vw, 1.25rem);
    font-style: italic;
    color: var(--silver-ash);
    max-width: 36ch;
    line-height: 1.7;
}

.section-title {
    font-family: var(--ff-display);
    font-weight: 400;
    font-size: clamp(2.4rem, 6vw, 5rem);
    letter-spacing: 0.12em;
    line-height: 1.05;
    color: var(--silver-ash);
    margin: 0 0 clamp(28px, 4vh, 48px);
}

.prose {
    font-family: var(--ff-body);
    font-size: clamp(0.95rem, 1.3vw, 1.1rem);
    line-height: 1.95;
    color: var(--silver-ash);
    max-width: 46ch;
    margin: 0 0 1.4em;
}

.compose--center .prose { margin-left: auto; margin-right: auto; }
.compose--right .prose { margin-left: auto; }

/* =====================================================
   Reveal animation
   ===================================================== */

.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 900ms var(--ease-out-expo), transform 900ms var(--ease-out-expo);
}

.chamber.is-seen .reveal { opacity: 1; transform: translateY(0); }

.chamber.is-seen .reveal:nth-of-type(1) { transition-delay:   0ms; }
.chamber.is-seen .reveal:nth-of-type(2) { transition-delay: 100ms; }
.chamber.is-seen .reveal:nth-of-type(3) { transition-delay: 200ms; }
.chamber.is-seen .reveal:nth-of-type(4) { transition-delay: 300ms; }
.chamber.is-seen .reveal:nth-of-type(5) { transition-delay: 400ms; }
.chamber.is-seen .reveal:nth-of-type(6) { transition-delay: 500ms; }
.chamber.is-seen .reveal:nth-of-type(7) { transition-delay: 600ms; }
.chamber.is-seen .reveal:nth-of-type(8) { transition-delay: 700ms; }

.chamber.is-seen .section-title {
    animation: breathe 800ms var(--ease-out-expo) both;
    animation-delay: 250ms;
}

@keyframes breathe {
    0%   { transform: scale(1.02); }
    100% { transform: scale(1); }
}

/* =====================================================
   Section rule (horizontal divider between chambers)
   ===================================================== */

.section-rule {
    position: absolute;
    left: var(--page-pad);
    right: var(--page-pad);
    bottom: 0;
    height: 24px;
    display: flex;
    align-items: center;
}

.rule-line {
    display: block;
    height: 1px;
    background: var(--wisteria-fade);
    width: 0%;
    transition: width 800ms var(--ease-out-expo);
    opacity: 0.55;
}

.chamber.is-ruled .rule-line { width: 100%; }

.cross-mark {
    position: absolute;
    right: 18%;
    top: 50%;
    transform: translate(0, -50%);
    font-family: var(--ff-display);
    color: var(--wisteria-fade);
    opacity: 0;
    transition: opacity 500ms ease-out;
    font-size: 0.9rem;
    letter-spacing: 0.1em;
}

.chamber.is-ruled .cross-mark {
    opacity: 0.55;
    transition-delay: 700ms;
}

/* =====================================================
   Landing specifics
   ===================================================== */

.chamber--landing .chamber__inner { align-items: start; }

.decor-fan {
    margin-top: clamp(40px, 6vh, 72px);
    position: relative;
    width: 120px;
    height: 60px;
    opacity: 0;
    transition: opacity 1200ms var(--ease-out-expo);
    transition-delay: 1400ms;
}

.chamber--landing.is-seen .decor-fan { opacity: 0.45; }

.decor-fan span {
    position: absolute;
    left: 0;
    bottom: 0;
    width: 60px;
    height: 1px;
    background: var(--wisteria-fade);
    transform-origin: left center;
}

.decor-fan span:nth-child(1) { transform: rotate(-75deg); }
.decor-fan span:nth-child(2) { transform: rotate(-60deg); }
.decor-fan span:nth-child(3) { transform: rotate(-45deg); }
.decor-fan span:nth-child(4) { transform: rotate(-30deg); }
.decor-fan span:nth-child(5) { transform: rotate(-15deg); }
.decor-fan span:nth-child(6) { transform: rotate(  0deg); }

/* =====================================================
   Statement specifics
   ===================================================== */

.chamber--statement { background: linear-gradient(180deg, transparent 0%, rgba(42, 38, 64, 0.25) 50%, transparent 100%); }

.concentric {
    margin: clamp(48px, 6vh, 80px) auto 0;
    position: relative;
    width: 140px;
    height: 140px;
}

.concentric span {
    position: absolute;
    top: 50%;
    left: 50%;
    border-radius: 50%;
    border: 1px solid var(--wisteria-fade);
    transform: translate(-50%, -50%);
}

.concentric span:nth-child(1) { width: 140px; height: 140px; opacity: 0.18; }
.concentric span:nth-child(2) { width:  90px; height:  90px; opacity: 0.30; }
.concentric span:nth-child(3) { width:  40px; height:  40px; opacity: 0.50; }

/* =====================================================
   Gallery specifics — staggered diagonal plates
   ===================================================== */

.chamber--gallery .chamber__inner {
    min-height: 80vh;
    padding-top: 80px;
}

.plate {
    position: relative;
    padding: clamp(24px, 3vw, 36px);
    background: rgba(42, 38, 64, 0.35);
    border: 1px solid rgba(155, 142, 196, 0.15);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    transition: transform 600ms var(--ease-out-expo),
                border-color 600ms ease-out,
                background 600ms ease-out;
}

.plate:hover {
    transform: translateY(-4px);
    border-color: rgba(155, 142, 196, 0.45);
    background: rgba(42, 38, 64, 0.55);
}

.plate--a { grid-column: 2 / span 4; margin-top:  40px; }
.plate--b { grid-column: 6 / span 4; margin-top: 180px; }
.plate--c { grid-column: 9 / span 4; margin-top: 320px; }

@media (max-width: 900px) {
    .plate--a, .plate--b, .plate--c { grid-column: 1 / -1; margin-top: 24px; }
}

.plate__index {
    font-family: var(--ff-sans);
    font-weight: 100;
    font-size: 0.8rem;
    letter-spacing: 0.32em;
    color: var(--wisteria-fade);
    display: block;
    margin-bottom: 16px;
}

.plate__title {
    font-family: var(--ff-display);
    font-weight: 400;
    font-size: clamp(1.4rem, 2.4vw, 1.9rem);
    letter-spacing: 0.12em;
    margin: 0 0 18px;
    color: var(--silver-ash);
}

.plate__caption {
    font-family: var(--ff-body);
    font-size: 0.95rem;
    line-height: 1.75;
    color: var(--silver-ash);
    margin: 0 0 24px;
}

.plate__swatch {
    display: block;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--sw, #fff);
    box-shadow: 0 0 0 1px rgba(212, 208, 224, 0.2),
                0 0 40px -8px var(--sw, #fff);
}

/* =====================================================
   Closing specifics
   ===================================================== */

.colophon {
    margin: clamp(32px, 4vh, 56px) 0 clamp(32px, 5vh, 64px);
    padding: 0;
    display: grid;
    gap: 14px 40px;
    grid-template-columns: auto 1fr;
    font-family: var(--ff-sans);
    font-weight: 300;
    font-size: clamp(0.85rem, 1.1vw, 0.98rem);
    letter-spacing: 0.05em;
    text-align: left;
    max-width: 520px;
    margin-left: auto;
}

.colophon > div {
    display: contents;
}

.colophon dt {
    font-family: var(--ff-sans);
    font-weight: 100;
    text-transform: uppercase;
    letter-spacing: 0.32em;
    font-size: 0.72rem;
    color: var(--pewter-haze);
    padding-top: 4px;
}

.colophon dd {
    margin: 0;
    color: var(--silver-ash);
    font-family: var(--ff-body);
}

.foot {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 14px;
    font-family: var(--ff-sans);
    font-weight: 100;
    font-size: 0.78rem;
    letter-spacing: 0.28em;
    text-transform: uppercase;
    color: var(--pewter-haze);
    padding-top: clamp(32px, 5vh, 72px);
    border-top: 1px solid rgba(155, 142, 196, 0.15);
    max-width: 520px;
    margin-left: auto;
}

.foot__mark { color: var(--wisteria-fade); font-size: 1rem; }

/* =====================================================
   Cursor glow (soft halo following the pointer)
   ===================================================== */

.cursor-glow {
    position: fixed;
    top: 0;
    left: 0;
    width: 420px;
    height: 420px;
    border-radius: 50%;
    background: radial-gradient(circle,
        rgba(155, 142, 196, 0.12) 0%,
        rgba(155, 142, 196, 0.05) 40%,
        rgba(155, 142, 196, 0.00) 70%);
    transform: translate(-50%, -50%);
    pointer-events: none;
    z-index: 3;
    opacity: 0;
    transition: opacity 800ms ease-out;
    mix-blend-mode: screen;
    filter: blur(20px);
}

body.has-cursor .cursor-glow { opacity: 1; }

@media (max-width: 900px) {
    .cursor-glow { display: none; }
}

/* =====================================================
   Selection
   ===================================================== */

::selection {
    background: var(--wisteria-fade);
    color: var(--ink-dusk);
}