/* ============================================================
   tanso.bar — Swiss grid × Japanese candlelight
   Duotone editorial. Carbon dark + Ember warm.
   ============================================================ */

:root {
    --carbon-dark: #1C1C1E;
    --ember-warm: #E8A44C;
    --paper-ash:  #E8E4DC;
    --shadow-deep:#2A2826;
    --candle-glow:#F5D88A;
    --carbon-mid: #5A5652;
    --spark-orange:#D4723C;

    --grid-gap: 24px;
    --grid-max: 1200px;
    --side-pad: 5vw;

    --font-display: 'Space Grotesk', 'Inter', system-ui, sans-serif;
    --font-body:    'Spectral', 'Inter', Georgia, serif;
    --font-mono:    'Space Mono', 'Space Grotesk', ui-monospace, monospace;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    background: var(--paper-ash);
    color: var(--carbon-dark);
    font-family: var(--font-body);
    font-weight: 400;
    font-size: clamp(0.95rem, 1.1vw, 1.1rem);
    line-height: 1.8;
    overflow-x: hidden;
}

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

/* ---------- Grain overlay ---------- */
.grain-filter {
    position: absolute;
    width: 0;
    height: 0;
    visibility: hidden;
}

.grain {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 99;
    opacity: 0.03;
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='240' height='240'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.7' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0.11  0 0 0 0 0.11  0 0 0 0 0.12  0 0 0 1 0'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
    mix-blend-mode: multiply;
}

/* ---------- Ambient candle flicker ---------- */
.ambient-glow {
    position: fixed;
    inset: -10vh -10vw;
    pointer-events: none;
    z-index: 0;
    background: radial-gradient(
        circle at 50% 55%,
        rgba(232, 164, 76, 0.18) 0%,
        rgba(232, 164, 76, 0.08) 28%,
        rgba(232, 164, 76, 0.00) 60%
    );
    opacity: 0.05;
    animation: flicker 4s ease-in-out infinite;
    will-change: opacity, transform;
}

@keyframes flicker {
    0%, 100% { opacity: 0.04; transform: translate(0, 0) scale(1); }
    23%      { opacity: 0.06; transform: translate(-2px, 1px) scale(1.01); }
    47%      { opacity: 0.03; transform: translate(1px, -1px) scale(0.995); }
    68%      { opacity: 0.07; transform: translate(-1px, 2px) scale(1.02); }
    85%      { opacity: 0.05; transform: translate(2px, -1px) scale(1.005); }
}

/* ---------- Main editorial container ---------- */
.editorial {
    position: relative;
    z-index: 1;
    width: 100%;
    padding: 0 var(--side-pad);
}

/* ---------- 12-column Swiss grid helpers ---------- */
.cover-grid,
.spread-grid,
.colophon-grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: var(--grid-gap);
    max-width: var(--grid-max);
    margin: 0 auto;
    width: 100%;
}

/* ============================================================
   COVER
   ============================================================ */
.cover {
    min-height: 100vh;
    display: flex;
    align-items: flex-start;
    padding-top: 33vh;
    position: relative;
}

.cover-text {
    grid-column: 1 / span 7;
    display: flex;
    flex-direction: column;
    gap: 1.6rem;
}

.cover-visual {
    grid-column: 8 / span 5;
    display: flex;
    align-items: flex-start;
    justify-content: center;
}

.meta-line {
    display: flex;
    gap: 1.4rem;
    flex-wrap: wrap;
    border-top: 1px solid var(--carbon-mid);
    padding-top: 0.7rem;
    margin-bottom: 0.3rem;
}

.meta-label {
    font-family: var(--font-mono);
    font-weight: 400;
    font-size: 0.78rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--carbon-mid);
}

.meta-value {
    font-family: var(--font-mono);
    font-size: 0.82rem;
    color: var(--carbon-dark);
    margin-right: 1.2rem;
}

.hero-title {
    font-family: var(--font-display);
    font-weight: 500;
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    line-height: 1.02;
    letter-spacing: -0.015em;
    color: var(--carbon-dark);
    margin: 0;
    text-shadow: 0 0 30px rgba(232, 164, 76, 0.12);
    cursor: pointer;
    position: relative;
    overflow: hidden;
    display: inline-block;
    padding: 0.1em 0.05em;
}

.hero-subtitle {
    font-family: var(--font-body);
    font-style: italic;
    font-size: clamp(1rem, 1.3vw, 1.2rem);
    line-height: 1.6;
    color: var(--shadow-deep);
    max-width: 36ch;
    margin: 0;
}

.cover-footer {
    margin-top: 3rem;
}

/* ============================================================
   SPREADS (editorial flow)
   ============================================================ */
.spread {
    padding: 6rem 0;
    position: relative;
}

.spread-text {
    display: flex;
    flex-direction: column;
    gap: 1.1rem;
}

.spread-visual {
    display: flex;
    align-items: center;
    justify-content: center;
}

/* text : 55% (7 cols) / visual : 45% (5 cols) — Swiss golden preference */
.spread-odd .spread-text   { grid-column: 1 / span 7; }
.spread-odd .spread-visual { grid-column: 8 / span 5; }

.spread-even .spread-visual{ grid-column: 1 / span 5; }
.spread-even .spread-text  { grid-column: 6 / span 7; }

.section-number {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--spark-orange);
    margin-bottom: 0.4rem;
}

.section-heading {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(1.6rem, 3vw, 2.4rem);
    line-height: 1.15;
    letter-spacing: 0.02em;
    color: var(--carbon-dark);
    margin: 0 0 0.6rem 0;
    max-width: 22ch;
    text-shadow: 0 0 30px rgba(232, 164, 76, 0.1);
    cursor: pointer;
    position: relative;
    overflow: hidden;
    padding: 0.05em 0.02em;
}

.lede {
    font-family: var(--font-body);
    font-size: clamp(1.05rem, 1.25vw, 1.2rem);
    line-height: 1.6;
    color: var(--carbon-dark);
    margin: 0.4rem 0;
}

.spread p {
    margin: 0.4rem 0;
    color: var(--shadow-deep);
    max-width: 48ch;
}

.spread em {
    font-style: italic;
    color: var(--spark-orange);
}

.data-line {
    margin-top: 1.2rem;
    padding-top: 0.9rem;
    border-top: 1px solid var(--carbon-mid);
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 0.3rem;
}

.data-line .meta-label { margin-right: 0.3rem; }

/* ---------- Section dividers ---------- */
.section-divider {
    position: relative;
    border: none;
    height: 1px;
    background: var(--carbon-mid);
    width: 100%;
    max-width: var(--grid-max);
    margin: 0 auto;
    opacity: 0.6;
}
.section-divider::after {
    content: "";
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--carbon-mid);
}

/* ---------- Abstract compositions ---------- */
.composition {
    width: 100%;
    aspect-ratio: 1 / 1;
    max-width: 440px;
    display: block;
}

/* ============================================================
   COLOPHON
   ============================================================ */
.colophon {
    padding: 6rem 0 3rem 0;
    background: var(--carbon-dark);
    color: var(--paper-ash);
    margin: 4rem calc(-1 * var(--side-pad)) 0 calc(-1 * var(--side-pad));
    padding-left: var(--side-pad);
    padding-right: var(--side-pad);
    position: relative;
}

.colophon .meta-label { color: var(--candle-glow); }
.colophon .meta-value { color: var(--paper-ash); }

.colophon-block {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.colophon-block:nth-child(1) { grid-column: 1 / span 5; }
.colophon-block:nth-child(2) { grid-column: 6 / span 3; }
.colophon-block:nth-child(3) { grid-column: 9 / span 4; }

.colophon-heading {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(1.3rem, 2.2vw, 1.9rem);
    line-height: 1.2;
    letter-spacing: 0.02em;
    color: var(--paper-ash);
    margin: 0.2rem 0 0.4rem 0;
    max-width: 20ch;
    text-shadow: 0 0 30px rgba(232, 164, 76, 0.22);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.colophon-block p {
    color: var(--paper-ash);
    opacity: 0.85;
    margin: 0;
    max-width: 34ch;
}

.imprint-line {
    font-style: italic;
    color: var(--candle-glow);
    opacity: 0.8;
}

.swatch-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 0.55rem;
}

.swatch-list li {
    display: grid;
    grid-template-columns: 18px 1fr auto;
    align-items: center;
    gap: 0.7rem;
    font-family: var(--font-mono);
    font-size: 0.78rem;
}

.swatch {
    display: inline-block;
    width: 18px;
    height: 18px;
    border: 1px solid var(--carbon-mid);
}

.swatch-name {
    color: var(--paper-ash);
    letter-spacing: 0.05em;
}

.swatch-hex {
    color: var(--ember-warm);
    letter-spacing: 0.04em;
}

.foot {
    max-width: var(--grid-max);
    margin: 3.5rem auto 0 auto;
    padding-top: 1.2rem;
    border-top: 1px solid var(--carbon-mid);
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1rem;
}

.foot .meta-label { color: var(--carbon-mid); }

/* ============================================================
   RIPPLE
   ============================================================ */
.ripple-target {
    position: relative;
    overflow: hidden;
}

.ripple {
    position: absolute;
    border-radius: 50%;
    background: var(--ember-warm);
    opacity: 0.3;
    transform: scale(0);
    pointer-events: none;
    animation: ripple-expand 0.6s ease-out forwards;
    mix-blend-mode: screen;
}

.colophon .ripple {
    background: var(--candle-glow);
    mix-blend-mode: screen;
}

@keyframes ripple-expand {
    0%   { transform: scale(0);   opacity: 0.3; }
    100% { transform: scale(4);   opacity: 0;   }
}

/* ============================================================
   RESPONSIVE — collapse to single column below 820px
   ============================================================ */
@media (max-width: 820px) {
    .cover {
        padding-top: 18vh;
        padding-bottom: 8vh;
        min-height: auto;
    }
    .cover-text,
    .cover-visual,
    .spread-odd .spread-text,
    .spread-odd .spread-visual,
    .spread-even .spread-text,
    .spread-even .spread-visual,
    .colophon-block:nth-child(1),
    .colophon-block:nth-child(2),
    .colophon-block:nth-child(3) {
        grid-column: 1 / -1;
    }
    .spread { padding: 3.5rem 0; }
    .composition { max-width: 360px; margin: 0 auto; }
    .foot { flex-direction: column; gap: 0.5rem; }
}