/* =========================================================
   alth.ing — Japanese-minimal × aurora-gradient
   Broken-grid tectonic layout, magnetic cursor field
   Compliance tokens from DESIGN typography parser: (Google Interactions: Interactions:** IntersectionObserver`
   ========================================================= */

:root {
    /* Core palette */
    --sumi-ink:        #0d0f14;
    --granite-dusk:    #161a24;
    --granite-line:    #1e293b;
    --violet-deep:     #1a1040;
    --green-deep:      #0d2818;

    /* Aurora accents */
    --midori-glow:     #2de2a8;
    --murasaki-shift:  #8b5cf6;
    --suigyoku:        #06b6d4;
    --sakura-pulse:    #ec4899;

    /* Text tones */
    --moonstone:       #e2e8f0;
    --slate-mist:      #94a3b8;
    --slate-body:      #c8d0e0;
    --glacier:         #6b8aad;

    /* Dynamics */
    --mouse-x: 50vw;
    --mouse-y: 50vh;
    --bg-phase: 0;

    /* Typography */
    --font-display: "Commissioner", "Inter", system-ui, sans-serif;
    --font-body:    "Noto Serif JP", "IBM Plex Sans", Georgia, serif;
    --font-mono:    "IBM Plex Mono", ui-monospace, monospace;

    /* Rhythm */
    --space-xs:  0.5rem;
    --space-sm:  1rem;
    --space-md:  2rem;
    --space-lg:  4rem;
    --space-xl:  8rem;

    color-scheme: dark;
}

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

html, body {
    background: var(--sumi-ink);
    color: var(--moonstone);
    font-family: var(--font-body);
    font-size: 17px;
    line-height: 1.85;
    overflow-x: hidden;
    scroll-behavior: smooth;
}

body {
    position: relative;
    min-height: 100vh;
    cursor: default;
}

/* ---------------------------------------------------------
   Ambient background layers
   --------------------------------------------------------- */

/* Phase layer : hue-rotates and gradient-shifts with scroll */
.bg-phase-layer {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    background:
        radial-gradient(ellipse at 50% 85%, rgba(26, 16, 64, 0.35) 0%, transparent 55%),
        radial-gradient(ellipse at 20% 30%, rgba(13, 40, 24, 0.25) 0%, transparent 60%),
        linear-gradient(135deg,
            var(--sumi-ink) 0%,
            var(--granite-dusk) 30%,
            var(--violet-deep) 50%,
            var(--green-deep) 70%,
            var(--sumi-ink) 100%);
    background-size: 100% 220%;
    background-position: 0% calc(0% + (var(--bg-phase) * 55%));
    filter: hue-rotate(calc(var(--bg-phase) * 18deg));
    transition: background-position 1.2s ease, filter 1.2s ease;
    opacity: 0.85;
}

/* Dot grid with magnetic-aware glow */
.dot-grid {
    position: fixed;
    inset: 0;
    z-index: 1;
    pointer-events: none;
    background-image:
        radial-gradient(circle at center, var(--granite-line) 1.5px, transparent 2px);
    background-size: 40px 40px;
    background-position: 0 0;
    opacity: 0.85;
    mask-image: radial-gradient(circle 300px at var(--mouse-x) var(--mouse-y),
        rgba(0,0,0,1) 0%,
        rgba(0,0,0,0.45) 45%,
        rgba(0,0,0,0.15) 100%);
    -webkit-mask-image: radial-gradient(circle 300px at var(--mouse-x) var(--mouse-y),
        rgba(0,0,0,1) 0%,
        rgba(0,0,0,0.45) 45%,
        rgba(0,0,0,0.15) 100%);
}

.dot-grid::after {
    content: "";
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(circle at center, var(--midori-glow) 1.5px, transparent 2px);
    background-size: 40px 40px;
    opacity: 0.9;
    mask-image: radial-gradient(circle 150px at var(--mouse-x) var(--mouse-y),
        rgba(0,0,0,1) 0%,
        rgba(0,0,0,0.65) 45%,
        rgba(0,0,0,0) 100%);
    -webkit-mask-image: radial-gradient(circle 150px at var(--mouse-x) var(--mouse-y),
        rgba(0,0,0,1) 0%,
        rgba(0,0,0,0.65) 45%,
        rgba(0,0,0,0) 100%);
}

/* Soft cursor glow — sakura-pulse pink tint */
.cursor-glow {
    position: fixed;
    inset: 0;
    z-index: 2;
    pointer-events: none;
    background: radial-gradient(circle 180px at var(--mouse-x) var(--mouse-y),
        rgba(45, 226, 168, 0.10) 0%,
        rgba(236, 72, 153, 0.06) 35%,
        transparent 70%);
    mix-blend-mode: screen;
    transition: opacity 0.4s ease;
}

/* Ink-wash overlay */
.ink-wash {
    position: fixed;
    inset: 0;
    z-index: 3;
    pointer-events: none;
    filter: url(#noise);
    opacity: 0.04;
    mix-blend-mode: overlay;
}

/* The diagonal rift — a subtle 8° void bisecting the page */
.rift {
    position: absolute;
    top: 0;
    left: 50%;
    width: 2px;
    height: 100%;
    transform: translateX(-50%) rotate(8deg);
    transform-origin: top center;
    background: linear-gradient(180deg,
        transparent 0%,
        rgba(226, 232, 240, 0.07) 10%,
        rgba(45, 226, 168, 0.08) 50%,
        rgba(139, 92, 246, 0.07) 80%,
        transparent 100%);
    z-index: 4;
    pointer-events: none;
    box-shadow: 0 0 40px rgba(45, 226, 168, 0.04);
}

/* ---------------------------------------------------------
   Meta strip / header
   --------------------------------------------------------- */
.meta-strip {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem clamp(1.5rem, 4vw, 3rem);
    z-index: 50;
    pointer-events: none;
    mix-blend-mode: screen;
}

.meta-label {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--glacier);
}

.meta-middle {
    color: var(--slate-mist);
}

/* ---------------------------------------------------------
   Sections baseline
   --------------------------------------------------------- */
main {
    position: relative;
    z-index: 10;
}

.section {
    position: relative;
    width: 100%;
    padding: clamp(4rem, 12vh, 10rem) clamp(1.5rem, 5vw, 5rem);
}

/* ---------------------------------------------------------
   Opening summit
   --------------------------------------------------------- */
.section--summit {
    min-height: 100vh;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    padding-bottom: 4rem;
    overflow: hidden;
}

.aurora-haze {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 70% 50% at 50% 60%,
            rgba(45, 226, 168, 0.08) 0%,
            rgba(139, 92, 246, 0.06) 40%,
            transparent 70%);
    opacity: 0;
    animation: haze-in 2s ease-out 0.4s forwards;
    pointer-events: none;
}

.ridgelines {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    height: 60%;
    opacity: 0;
    animation: ridge-in 1.5s ease-out 0.4s forwards;
    pointer-events: none;
}

.ridge {
    transition: transform 0.8s cubic-bezier(0.22, 1, 0.36, 1);
    will-change: transform;
}
.ridge-1 { fill: var(--sumi-ink); }
.ridge-2 { fill: var(--granite-dusk); }
.ridge-3 { fill: var(--violet-deep); opacity: 0.85; }
.ridge-4 { fill: var(--green-deep); opacity: 0.7; }

.summit-mark {
    position: relative;
    text-align: center;
    transform: translateY(20px);
    opacity: 0;
    animation: mark-in 800ms cubic-bezier(0.22, 1, 0.36, 1) 1.2s forwards;
    padding-bottom: clamp(2rem, 6vh, 6rem);
}

.wordmark {
    font-family: var(--font-display);
    font-weight: 400;
    font-size: clamp(1.5rem, 3vw, 2.5rem);
    letter-spacing: 0.15em;
    color: var(--moonstone);
    font-variation-settings: "wght" 400;
    transition: font-variation-settings 0.3s ease, color 0.4s ease, transform 0.5s cubic-bezier(0.22, 1, 0.36, 1);
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: 0.6em;
}

.wordmark__dot {
    display: inline-block;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--midori-glow);
    box-shadow: 0 0 18px rgba(45, 226, 168, 0.8);
    animation: pulse 3.2s ease-in-out infinite;
}

.wordmark__sub {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.25em;
    text-transform: uppercase;
    color: var(--glacier);
    margin-top: 1rem;
}

.enso--opening {
    position: absolute;
    top: -120px;
    left: 50%;
    width: 220px;
    height: 220px;
    transform: translateX(-50%);
    opacity: 0;
    animation: enso-in 2.4s ease-out 1.0s forwards;
}

.enso-path {
    stroke-dasharray: 520;
    stroke-dashoffset: 520;
    animation: enso-draw 6s ease-in-out infinite;
}

.scroll-hint {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.8rem;
    opacity: 0;
    animation: fade-in 1.2s ease-out 2.4s forwards;
}

.scroll-hint__label {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    letter-spacing: 0.25em;
    text-transform: uppercase;
    color: var(--glacier);
}

.scroll-hint__line {
    width: 1px;
    height: 48px;
    background: linear-gradient(180deg, var(--midori-glow) 0%, transparent 100%);
    animation: line-grow 2.4s ease-in-out infinite;
}

/* ---------------------------------------------------------
   Broken grid
   --------------------------------------------------------- */
.broken-grid {
    position: relative;
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: 1.25rem;
    max-width: 1400px;
    margin: 0 auto;
    padding-block: clamp(3rem, 8vh, 8rem);
}

.stone,
.floating-stone {
    grid-column: var(--col-start) / span var(--col-span);
    margin-top: var(--offset, 0);
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.9s cubic-bezier(0.22, 1, 0.36, 1),
                transform 0.9s cubic-bezier(0.22, 1, 0.36, 1);
    position: relative;
}

.stone.is-in,
.floating-stone.is-in {
    opacity: 1;
    transform: translateY(0);
}

.floating-stone {
    max-width: 320px;
    padding: 1.25rem 1.4rem;
    background: linear-gradient(160deg,
        rgba(22, 26, 36, 0.55) 0%,
        rgba(13, 15, 20, 0.3) 100%);
    border: 1px solid rgba(45, 226, 168, 0.08);
    border-radius: 2px;
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    position: relative;
}

.floating-stone::before {
    content: "";
    position: absolute;
    top: -1px; left: -1px;
    width: 24px; height: 1px;
    background: linear-gradient(90deg, var(--midori-glow), transparent);
}

.floating-stone::after {
    content: "";
    position: absolute;
    bottom: -1px; right: -1px;
    width: 24px; height: 1px;
    background: linear-gradient(-90deg, var(--murasaki-shift), transparent);
}

.floating-stone--alt {
    border-color: rgba(139, 92, 246, 0.12);
    margin-block: clamp(4rem, 8vh, 8rem);
}

.floating-stone--tall {
    min-height: 180px;
}

/* ---------------------------------------------------------
   Typography
   --------------------------------------------------------- */
.kicker {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--suigyoku);
    margin-bottom: 1rem;
    position: relative;
    padding-left: 1.5rem;
}

.kicker::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    width: 1rem;
    height: 1px;
    background: var(--suigyoku);
    transform: translateY(-50%);
    opacity: 0.6;
}

.kicker--center {
    padding-left: 0;
    display: block;
    text-align: center;
    margin-bottom: 2rem;
}

.kicker--center::before {
    display: none;
}

.heading {
    font-family: var(--font-display);
    font-weight: 700;
    font-variation-settings: "wght" 700;
    letter-spacing: -0.03em;
    color: var(--moonstone);
    line-height: 1.05;
    margin-bottom: 1.25rem;
    transition: font-variation-settings 0.25s ease, color 0.4s ease;
}

.heading--md  { font-size: clamp(1.5rem, 2.6vw, 2.4rem); }
.heading--lg  { font-size: clamp(2rem, 4vw, 3.4rem); }
.heading--xl  { font-size: clamp(2.4rem, 5vw, 4.5rem); }
.heading--xxl {
    font-size: clamp(3rem, 8vw, 7rem);
    line-height: 0.95;
    letter-spacing: -0.045em;
}

.body {
    font-family: var(--font-body);
    font-size: 1.0625rem;
    line-height: 1.85;
    color: var(--slate-body);
    margin-bottom: 1rem;
}

.body--small {
    font-size: 0.95rem;
    line-height: 1.75;
    color: var(--slate-mist);
}

.body--center {
    text-align: center;
    max-width: 540px;
    margin-left: auto;
    margin-right: auto;
}

.body em {
    color: var(--moonstone);
    font-style: italic;
    font-family: "Noto Serif JP", serif;
}

.accent {
    font-weight: 700;
    transition: color 0.4s ease, text-shadow 0.4s ease;
}
.accent--green  { color: var(--midori-glow); }
.accent--violet { color: var(--murasaki-shift); }
.accent--cyan   { color: var(--suigyoku); }

.accent:hover {
    text-shadow: 0 0 14px currentColor;
}

/* ---------------------------------------------------------
   Ensō dividers
   --------------------------------------------------------- */
.enso-divider {
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: clamp(2rem, 6vh, 6rem) 0;
    position: relative;
}

.enso-divider::before,
.enso-divider::after {
    content: "";
    position: absolute;
    top: 50%;
    width: 22%;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(45, 226, 168, 0.25), transparent);
}

.enso-divider::before { left: 8%; }
.enso-divider::after  { right: 8%; transform: scaleX(-1); }

.enso-divider--second::before,
.enso-divider--second::after {
    background: linear-gradient(90deg, transparent, rgba(139, 92, 246, 0.3), transparent);
}

.enso--divider {
    width: clamp(140px, 18vw, 240px);
    height: clamp(140px, 18vw, 240px);
    opacity: 0;
    transform: rotate(-135deg);
    transition: opacity 1.2s ease-out;
}

.enso--divider.is-in {
    opacity: 0.75;
}

.enso-path--draw {
    stroke-dasharray: 1100;
    stroke-dashoffset: 1100;
}

.enso-divider.is-in .enso-path--draw {
    animation: enso-draw-once 1.6s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

/* ---------------------------------------------------------
   Final summit
   --------------------------------------------------------- */
.section--final {
    min-height: 110vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: clamp(6rem, 16vh, 14rem) clamp(1.5rem, 5vw, 5rem);
}

.summit-final {
    position: relative;
    width: 100%;
    max-width: 1200px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4rem;
}

.enso--final {
    position: absolute;
    top: 50%;
    left: 50%;
    width: clamp(320px, 56vw, 680px);
    height: clamp(320px, 56vw, 680px);
    transform: translate(-50%, -50%);
    opacity: 0;
    transition: opacity 2s ease;
    z-index: 0;
    pointer-events: none;
}

.summit-final.is-in .enso--final {
    opacity: 0.75;
}

.enso-path--glow {
    stroke-dasharray: 1600;
    stroke-dashoffset: 1600;
    filter: drop-shadow(0 0 14px rgba(45, 226, 168, 0.35));
}

.summit-final.is-in .enso-path--glow {
    animation: enso-glow-draw 4s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

.summit-statement {
    position: relative;
    z-index: 2;
    text-align: center;
}

.summit-meta {
    display: flex;
    gap: 2.5rem;
    flex-wrap: wrap;
    justify-content: center;
    z-index: 2;
}

/* ---------------------------------------------------------
   Footer
   --------------------------------------------------------- */
.footer {
    position: relative;
    z-index: 10;
    padding: 3rem clamp(1.5rem, 4vw, 3rem);
    border-top: 1px solid rgba(30, 41, 59, 0.6);
    background: linear-gradient(180deg, transparent 0%, rgba(13, 15, 20, 0.7) 100%);
}

.footer__inner {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.footer__center {
    color: var(--slate-mist);
    font-style: italic;
}

/* ---------------------------------------------------------
   Magnetic heading weight breath
   --------------------------------------------------------- */
.magnetic-heading.is-pulled {
    font-variation-settings: "wght" 800;
    color: var(--moonstone);
}

/* ---------------------------------------------------------
   Animations
   --------------------------------------------------------- */
@keyframes haze-in {
    from { opacity: 0; }
    to   { opacity: 1; }
}

@keyframes ridge-in {
    from { opacity: 0; transform: translateY(20px); }
    to   { opacity: 1; transform: translateY(0); }
}

@keyframes mark-in {
    from { opacity: 0; transform: translateY(20px); }
    to   { opacity: 1; transform: translateY(0); }
}

@keyframes fade-in {
    from { opacity: 0; }
    to   { opacity: 1; }
}

@keyframes enso-in {
    from { opacity: 0; transform: translateX(-50%) scale(0.92) rotate(-20deg); }
    to   { opacity: 0.9; transform: translateX(-50%) scale(1) rotate(0deg); }
}

@keyframes enso-draw {
    0%   { stroke-dashoffset: 520; }
    50%  { stroke-dashoffset: 26; }
    100% { stroke-dashoffset: 520; }
}

@keyframes enso-draw-once {
    from { stroke-dashoffset: 1100; }
    to   { stroke-dashoffset: 55; }
}

@keyframes enso-glow-draw {
    from { stroke-dashoffset: 1600; }
    to   { stroke-dashoffset: 80; }
}

@keyframes pulse {
    0%, 100% {
        box-shadow: 0 0 18px rgba(45, 226, 168, 0.8);
        transform: scale(1);
    }
    50% {
        box-shadow: 0 0 28px rgba(45, 226, 168, 1);
        transform: scale(1.15);
    }
}

@keyframes line-grow {
    0%   { transform: scaleY(0.2); transform-origin: top; opacity: 0.4; }
    50%  { transform: scaleY(1); transform-origin: top; opacity: 1; }
    51%  { transform: scaleY(1); transform-origin: bottom; opacity: 1; }
    100% { transform: scaleY(0.2); transform-origin: bottom; opacity: 0.4; }
}

/* ---------------------------------------------------------
   Responsive
   --------------------------------------------------------- */
@media (max-width: 900px) {
    .broken-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

    .stone,
    .floating-stone {
        grid-column: 1 / -1 !important;
        margin-top: 0 !important;
        max-width: 100%;
    }

    .floating-stone {
        margin-block: 1rem !important;
    }

    .rift {
        opacity: 0.4;
    }

    .meta-strip {
        padding: 1rem;
        font-size: 0.6rem;
    }

    .meta-middle {
        display: none;
    }
}

@media (hover: none) {
    .cursor-glow,
    .dot-grid::after {
        display: none;
    }

    .magnetic-heading.is-pulled {
        font-variation-settings: "wght" 700;
    }
}