/* ============================================================
   tanso.day  —  Swiss-precision carbon dreamscape
   ------------------------------------------------------------
   Palette:
     #2D2926  carbon dark
     #4A4440  warm charcoal
     #8C7B6B  sandstone
     #E8967C  coral blush
     #F2A65A  amber glow
     #F5C49C  peach haze
     #FFF5EB  warm cream
     #D4735E  sunset rose
     #6B4E71  twilight violet
   ============================================================ */

:root {
    --carbon-dark:    #2D2926;
    --warm-charcoal:  #4A4440;
    --sandstone:      #8C7B6B;
    --coral-blush:    #E8967C;
    --amber-glow:     #F2A65A;
    --peach-haze:     #F5C49C;
    --warm-cream:     #FFF5EB;
    --sunset-rose:    #D4735E;
    --twilight-violet:#6B4E71;

    --ease-swiss: cubic-bezier(0.22, 1, 0.36, 1);
    --gutter: 24px;
}

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

html { scroll-behavior: smooth; }

body {
    font-family: 'DM Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    font-weight: 400;
    color: var(--warm-charcoal);
    background: var(--warm-cream);
    line-height: 1.75;
    letter-spacing: 0.01em;
    overflow-x: hidden;
    position: relative;
    min-height: 100vh;
}

/* Page-long warmth gradient: subtle radial peach haze + bottom drift to dark */
body::before {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    background:
        radial-gradient(ellipse 80vw 60vh at 50% 30%, rgba(245, 196, 156, 0.18), transparent 70%),
        radial-gradient(ellipse 60vw 50vh at 80% 80%, rgba(232, 150, 124, 0.10), transparent 70%);
}

/* ---------- Progress bar ---------- */
.progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: rgba(140, 123, 107, 0.18);
    z-index: 100;
}
.progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--amber-glow), var(--coral-blush), var(--sunset-rose));
    transition: width 80ms linear;
}
.progress-cross {
    position: absolute;
    top: 4px;
    transform: translateX(-50%);
    color: var(--coral-blush);
    font-family: 'Space Grotesk', sans-serif;
    font-size: 10px;
    font-weight: 500;
    opacity: 0.7;
}

/* ---------- Grid backbone (12 vertical rules) ---------- */
.grid-backbone {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 1;
    display: grid;
    grid-template-columns: repeat(13, 1fr);
    padding: 0 var(--gutter);
    transition: opacity 1.5s var(--ease-swiss);
}
.grid-backbone.faded { opacity: 0.0; }
.grid-backbone.dimmed { opacity: 0.3; }
.grid-rule {
    width: 1px;
    height: 100%;
    background: var(--coral-blush);
    opacity: 0.08;
    justify-self: center;
}

/* ---------- Sections ---------- */
.section {
    position: relative;
    z-index: 2;
    padding: 14vh var(--gutter);
    max-width: 1400px;
    margin: 0 auto;
}

.grid-12 {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: var(--gutter);
}
.col-span-6 { grid-column: span 6; }
.col-span-12 { grid-column: span 12; }

/* ---------- Typography ---------- */
.display-title,
.section-title,
.dream-line {
    font-family: 'Space Grotesk', 'Helvetica Neue', Helvetica, sans-serif;
    font-weight: 700;
    line-height: 1.05;
    letter-spacing: 0.02em;
    color: var(--carbon-dark);
}

.display-title {
    font-size: clamp(4.5rem, 14vw, 14rem);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    line-height: 1;
}
.display-title .ltr {
    display: inline-block;
    transform: translateY(40px);
    opacity: 0;
    will-change: transform, opacity;
}
.display-title.in .ltr {
    transform: translateY(0);
    opacity: 1;
    transition: transform 700ms var(--ease-swiss), opacity 700ms var(--ease-swiss);
}
.display-title.in .ltr:nth-child(1) { transition-delay: 0ms; }
.display-title.in .ltr:nth-child(2) { transition-delay: 80ms; }
.display-title.in .ltr:nth-child(3) { transition-delay: 160ms; }
.display-title.in .ltr:nth-child(4) { transition-delay: 240ms; }
.display-title.in .ltr:nth-child(5) { transition-delay: 320ms; }

.section-title {
    font-size: clamp(2.5rem, 6vw, 5.5rem);
    text-transform: uppercase;
    margin: 12px 0 32px;
}
.section-title-soft {
    text-transform: none;
    color: var(--warm-charcoal);
}

.section-label {
    font-family: 'IBM Plex Mono', 'Courier New', monospace;
    font-weight: 400;
    font-size: 0.78rem;
    letter-spacing: 0.18em;
    color: var(--sandstone);
    text-transform: uppercase;
    margin-bottom: 8px;
}

.cross {
    color: var(--coral-blush);
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 500;
    margin: 0 2px;
}

.caption-mono {
    font-family: 'IBM Plex Mono', 'Courier New', monospace;
    font-weight: 300;
    font-size: 0.8rem;
    letter-spacing: 0.05em;
    color: var(--sandstone);
    margin-top: 18px;
}

p {
    font-size: clamp(0.95rem, 1.2vw, 1.1rem);
    margin-bottom: 1.1em;
    max-width: 60ch;
}

/* ---------- HERO ---------- */
.section-hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: 0;
    padding-bottom: 0;
    text-align: center;
}
.hero-inner {
    position: relative;
    z-index: 4;
}
.hero-subtitle {
    font-family: 'DM Sans', sans-serif;
    font-weight: 300;
    font-size: clamp(1rem, 1.6vw, 1.4rem);
    color: var(--warm-charcoal);
    letter-spacing: 0.05em;
    margin: 28px auto 0;
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 1200ms var(--ease-swiss), transform 1200ms var(--ease-swiss);
    transition-delay: 600ms;
    max-width: 30ch;
}
.hero-subtitle.in { opacity: 1; transform: translateY(0); }

.hero-meta {
    margin-top: 60px;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.72rem;
    letter-spacing: 0.2em;
    color: var(--sandstone);
    text-transform: uppercase;
    opacity: 0;
    transition: opacity 1200ms var(--ease-swiss);
    transition-delay: 1100ms;
}
.hero-meta.in { opacity: 1; }

/* ---------- Fixed lattice ---------- */
.fixed-lattice {
    position: fixed;
    z-index: 3;
    pointer-events: none;
    transition:
        top 900ms var(--ease-swiss),
        left 900ms var(--ease-swiss),
        right 900ms var(--ease-swiss),
        width 900ms var(--ease-swiss),
        height 900ms var(--ease-swiss),
        opacity 900ms var(--ease-swiss);
    top: 50%;
    left: 50%;
    width: 60vmin;
    height: 60vmin;
    transform: translate(-50%, -50%);
    opacity: 0.95;
}
.fixed-lattice svg { width: 100%; height: 100%; display: block; }
.lattice-rotor {
    transform-origin: 50% 50%;
    animation: rotate-slow 60s linear infinite;
}
.lattice-rotor-rev {
    transform-origin: 50% 50%;
    animation: rotate-slow-rev 90s linear infinite;
}
@keyframes rotate-slow {
    from { transform: rotate(0deg); }
    to   { transform: rotate(360deg); }
}
@keyframes rotate-slow-rev {
    from { transform: rotate(0deg); }
    to   { transform: rotate(-360deg); }
}

/* Stage 2: shrink to corner */
.fixed-lattice.corner {
    top: 80px;
    right: 40px;
    left: auto;
    width: 22vmin;
    height: 22vmin;
    transform: translate(0, 0);
    opacity: 0.85;
}
.fixed-lattice.faded {
    opacity: 0;
}
.fixed-lattice.dream-stage {
    top: 50%;
    left: 50%;
    width: 70vmin;
    height: 70vmin;
    transform: translate(-50%, -50%);
    opacity: 0;
}

/* ---------- BOND ---------- */
.section-bond {
    min-height: 100vh;
    display: flex;
    align-items: center;
}
.bond-text {
    grid-column: 1 / span 6;
}
.bond-text .reveal-block,
.bond-text .section-title,
.bond-text .section-label,
.bond-text .caption-mono {
    transform: translateX(-40px);
    opacity: 0;
    transition: transform 900ms var(--ease-swiss), opacity 900ms var(--ease-swiss);
}
.bond-text.in .section-label  { transform: none; opacity: 1; transition-delay: 0ms; }
.bond-text.in .section-title  { transform: none; opacity: 1; transition-delay: 120ms; }
.bond-text.in .reveal-block:nth-of-type(1) { transform: none; opacity: 1; transition-delay: 240ms; }
.bond-text.in .reveal-block:nth-of-type(2) { transform: none; opacity: 1; transition-delay: 360ms; }
.bond-text.in .reveal-block:nth-of-type(3) { transform: none; opacity: 1; transition-delay: 480ms; }
.bond-text.in .caption-mono   { transform: none; opacity: 1; transition-delay: 600ms; }

.bond-text p {
    border-bottom: 0.5px solid rgba(140, 123, 107, 0.3);
    padding-bottom: 12px;
    margin-bottom: 16px;
    margin-left: -20px;
    margin-right: -20px;
    padding-left: 20px;
    padding-right: 20px;
}

.bond-icons {
    grid-column: 7 / span 6;
    display: flex;
    flex-direction: column;
    gap: 36px;
    align-items: flex-end;
    padding-top: 60px;
}
.bond-icon {
    width: 100%;
    max-width: 260px;
    transform: translateX(60px);
    opacity: 0;
    transition: transform 900ms var(--ease-swiss), opacity 900ms var(--ease-swiss);
}
.bond-icon.in {
    transform: translateX(0);
    opacity: 1;
}
.bond-icon svg { width: 100%; height: auto; }

/* ---------- CYCLE / RIVER ---------- */
.section-cycle {
    min-height: 200vh;
    padding-top: 18vh;
    padding-bottom: 12vh;
}
.cycle-header {
    margin-bottom: 80px;
    max-width: 800px;
}
.river {
    position: relative;
    width: 100%;
    min-height: 1600px;
}
.river-curve {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}
.river-node {
    position: absolute;
    width: min(360px, 80vw);
    padding: 24px;
    background: rgba(255, 245, 235, 0.6);
    border: 0.5px solid rgba(232, 150, 124, 0.25);
    backdrop-filter: blur(2px);
    z-index: 2;
    opacity: 0;
    transform: translateY(40px) rotate(0deg);
    transition: opacity 1100ms var(--ease-swiss), transform 1100ms var(--ease-swiss);
}
.river-node.in {
    opacity: 1;
    transform: translateY(0) rotate(var(--rot, 0deg));
}
.river-node h3 {
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 500;
    font-size: 1.6rem;
    color: var(--carbon-dark);
    margin: 14px 0 10px;
    letter-spacing: 0.02em;
}
.river-node .iso-icon { width: 90px; height: 90px; }
.river-node .iso-icon svg { width: 100%; height: 100%; }

.node-1 { top: 0;     left: 8%;  }
.node-2 { top: 18%;   right: 6%; }
.node-3 { top: 36%;   left: 12%; }
.node-4 { top: 56%;   right: 8%; }
.node-5 { top: 78%;   left: 18%; }

@media (max-width: 900px) {
    .river { min-height: auto; display: flex; flex-direction: column; gap: 40px; }
    .river-node { position: relative; top: auto; left: auto; right: auto; width: 100%; }
    .river-curve { display: none; }
}

/* ---------- RETURN / table ---------- */
.section-return {
    min-height: 100vh;
    padding-top: 14vh;
}
.return-head { margin-bottom: 50px; }
.return-lede {
    font-size: clamp(1.05rem, 1.4vw, 1.25rem);
    color: var(--warm-charcoal);
    max-width: 60ch;
}
.data-table {
    border-top: 1px solid var(--carbon-dark);
    border-bottom: 1px solid var(--carbon-dark);
    margin-top: 30px;
}
.data-row {
    display: grid;
    grid-template-columns: 60px 2.5fr 1fr 1.2fr 1.2fr;
    align-items: baseline;
    padding: 18px 4px;
    border-bottom: 0.5px solid rgba(74, 68, 64, 0.25);
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.92rem;
    letter-spacing: 0.04em;
    color: var(--warm-charcoal);
    opacity: 0;
    transform: translateY(14px);
    transition: opacity 700ms var(--ease-swiss), transform 700ms var(--ease-swiss);
}
.data-row:last-child { border-bottom: none; }
.data-row.data-head {
    color: var(--carbon-dark);
    font-weight: 400;
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.18em;
    border-bottom: 1px solid var(--carbon-dark);
    opacity: 1;
    transform: none;
}
.data-table.in .data-row { opacity: 1; transform: none; }
.data-table.in .data-row:nth-child(2) { transition-delay: 60ms; }
.data-table.in .data-row:nth-child(3) { transition-delay: 120ms; }
.data-table.in .data-row:nth-child(4) { transition-delay: 180ms; }
.data-table.in .data-row:nth-child(5) { transition-delay: 240ms; }
.data-table.in .data-row:nth-child(6) { transition-delay: 300ms; }
.data-table.in .data-row:nth-child(7) { transition-delay: 360ms; }
.data-table.in .data-row:nth-child(8) { transition-delay: 420ms; }

.cell { padding-right: 12px; }
.cell-name {
    font-family: 'DM Sans', sans-serif;
    font-size: 1.05rem;
    color: var(--carbon-dark);
    letter-spacing: 0.01em;
}
.cell-num {
    font-feature-settings: "tnum";
    text-align: right;
    color: var(--carbon-dark);
    font-weight: 400;
}
.cell-flux { color: var(--sandstone); }
.cell-state {
    color: var(--sandstone);
    font-size: 0.78rem;
    text-transform: lowercase;
    letter-spacing: 0.12em;
}
.cell.highlight {
    background: var(--amber-glow);
    color: var(--carbon-dark);
    padding: 2px 8px;
    margin-right: 4px;
    display: inline-block;
}

/* ---------- DREAM ---------- */
.section-dream {
    min-height: 100vh;
    background: var(--carbon-dark);
    color: var(--warm-cream);
    margin-top: 12vh;
    padding-top: 18vh;
    padding-bottom: 14vh;
    overflow: hidden;
    position: relative;
    text-align: center;
    transition: background 1500ms var(--ease-swiss);
}
.section-dream::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 60vw 50vh at 50% 50%, rgba(107, 78, 113, 0.35), transparent 70%),
        radial-gradient(ellipse 40vw 30vh at 20% 80%, rgba(212, 115, 94, 0.18), transparent 70%);
    pointer-events: none;
}
.dream-text {
    position: relative;
    z-index: 4;
    max-width: 900px;
    margin: 0 auto;
    padding-top: 30vh;
}
.dream-line {
    color: var(--warm-cream);
    font-size: clamp(1.6rem, 3.5vw, 3rem);
    text-transform: none;
    letter-spacing: 0.01em;
    line-height: 1.25;
    font-weight: 500;
    margin: 18px auto 30px;
    max-width: 22ch;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 1400ms var(--ease-swiss), transform 1400ms var(--ease-swiss);
}
.dream-text.in .dream-line { opacity: 1; transform: none; transition-delay: 300ms; }
.dream-label,
.dream-caption {
    color: var(--peach-haze);
    opacity: 0;
    transition: opacity 1200ms var(--ease-swiss);
}
.dream-text.in .dream-label   { opacity: 1; transition-delay: 100ms; }
.dream-text.in .dream-caption { opacity: 1; transition-delay: 700ms; }

.dream-lattice {
    position: absolute;
    inset: 0;
    z-index: 1;
    pointer-events: none;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 1500ms var(--ease-swiss);
}
.dream-lattice.in { opacity: 0.85; }
.dream-lattice svg { width: 60vmin; height: 60vmin; }

.constellation {
    position: absolute;
    inset: 0;
    z-index: 2;
    pointer-events: none;
}
.star {
    position: absolute;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--twilight-violet);
    box-shadow: 0 0 12px 2px rgba(107, 78, 113, 0.7);
    opacity: 0;
    animation: pulse 4s ease-in-out infinite;
}
.constellation.in .star { opacity: 1; }
.star-1  { top: 12%; left: 8%;  animation-delay: 0s;   }
.star-2  { top: 22%; left: 78%; animation-delay: 0.3s; }
.star-3  { top: 35%; left: 28%; animation-delay: 0.6s; }
.star-4  { top: 18%; left: 55%; animation-delay: 0.9s; }
.star-5  { top: 60%; left: 12%; animation-delay: 1.2s; background: var(--coral-blush); box-shadow: 0 0 12px 2px rgba(232,150,124,0.7); }
.star-6  { top: 70%; left: 80%; animation-delay: 1.5s; }
.star-7  { top: 82%; left: 38%; animation-delay: 1.8s; background: var(--amber-glow); box-shadow: 0 0 12px 2px rgba(242,166,90,0.7); }
.star-8  { top: 88%; left: 65%; animation-delay: 2.1s; }
.star-9  { top: 45%; left: 88%; animation-delay: 2.4s; }
.star-10 { top: 55%; left: 48%; animation-delay: 2.7s; background: var(--sunset-rose); box-shadow: 0 0 12px 2px rgba(212,115,94,0.7); }
.star-11 { top: 30%; left: 92%; animation-delay: 0.4s; }
.star-12 { top: 75%; left: 22%; animation-delay: 1.1s; background: var(--peach-haze); box-shadow: 0 0 12px 2px rgba(245,196,156,0.6); }

@keyframes pulse {
    0%, 100% { transform: scale(0.8); opacity: 0.5; }
    50%      { transform: scale(1.3); opacity: 1; }
}

/* ---------- Footer ---------- */
.site-footer {
    position: relative;
    z-index: 5;
    background: var(--carbon-dark);
    color: var(--peach-haze);
    padding: 28px var(--gutter);
    text-align: center;
}
.footer-inner {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.7rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 14px;
    flex-wrap: wrap;
}
.footer-inner .cross { color: var(--coral-blush); }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
    .col-span-6 { grid-column: span 12; }
    .bond-icons { padding-top: 30px; align-items: stretch; }
    .data-row {
        grid-template-columns: 40px 2fr 1fr;
        font-size: 0.78rem;
    }
    .cell-flux, .cell-state { display: none; }
    .display-title { font-size: clamp(3.5rem, 18vw, 9rem); }
}