/* ==========================================================================
   datatelomere.com — sepia-nostalgic, ethereal-archival
   Palette:
     #f4ecd6  cream linen          (field)
     #e6d6b3  aged vellum          (card surface)
     #c9b58f  card border / soft tone
     #c9a97a  toned wheat          (accents, ribbons)
     #a48560  drift ink (older clusters)
     #b8a684  dust-light           (feathered edges, wave ink)
     #8a6a3f  walnut ink           (principal text)
     #7a6a52  pencil shadow        (handwriting)
     #5c3d1e  iron-gall            (spine, milestone caps, seals)
     #a85a32  oxidized cinnabar    (the single warm accent)
   ========================================================================== */

:root {
    --cream: #f4ecd6;
    --vellum: #e6d6b3;
    --wheat: #c9a97a;
    --vellum-border: #c9b58f;
    --walnut: #8a6a3f;
    --walnut-soft: #a48560;
    --iron-gall: #5c3d1e;
    --cinnabar: #a85a32;
    --pencil: #7a6a52;
    --dust-light: #b8a684;
    --ease-soft: cubic-bezier(.22, .61, .36, 1);
    --ease-expo: cubic-bezier(.16, 1, .3, 1);
}

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

html, body {
    background: var(--cream);
    color: var(--walnut);
    font-family: 'Cormorant Garamond', Georgia, serif;
    font-size: 16px;
    line-height: 1.62;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

body {
    min-height: 100vh;
    position: relative;
    padding-bottom: 4rem;
}

/* Paper grain overlay — site-wide micro-noise */
.paper-grain {
    position: fixed;
    inset: 0;
    pointer-events: none;
    opacity: 0.06;
    mix-blend-mode: multiply;
    z-index: 9999;
    background-image:
        radial-gradient(circle at 20% 30%, rgba(95, 65, 30, 0.18) 0.5px, transparent 1px),
        radial-gradient(circle at 70% 60%, rgba(122, 106, 82, 0.15) 0.5px, transparent 1px),
        radial-gradient(circle at 40% 80%, rgba(95, 65, 30, 0.12) 0.5px, transparent 1px),
        radial-gradient(circle at 90% 20%, rgba(122, 106, 82, 0.16) 0.5px, transparent 1px),
        radial-gradient(circle at 10% 70%, rgba(95, 65, 30, 0.14) 0.5px, transparent 1px);
    background-size: 3px 3px, 4px 4px, 5px 5px, 3px 3px, 4px 4px;
}

/* ==========================================================================
   Telomere Spine
   ========================================================================== */

.spine {
    position: absolute;
    top: 0;
    left: 56px;
    height: calc(100% - 4rem);
    width: 80px;
    pointer-events: none;
    z-index: 5;
}

.spine-line {
    position: absolute;
    top: 0;
    left: 0;
    width: 2px;
    height: 100%;
    overflow: visible;
}

.spine-line line {
    transition: stroke-dashoffset 2400ms var(--ease-soft);
}

.spine.drawn .spine-line line {
    stroke-dashoffset: 0;
}

.spine-ticks {
    list-style: none;
    position: relative;
    height: 100%;
}

.spine-ticks li {
    position: absolute;
    left: 0;
    display: flex;
    align-items: center;
    gap: 8px;
    opacity: 0;
    transform: translateX(-6px);
    transition: opacity 800ms var(--ease-soft), transform 800ms var(--ease-soft);
}

.spine.drawn .spine-ticks li {
    opacity: 1;
    transform: translateX(0);
}

/* sequential delays for year ticks */
.spine.drawn .spine-ticks li:nth-child(1) { transition-delay: 200ms; }
.spine.drawn .spine-ticks li:nth-child(2) { transition-delay: 480ms; }
.spine.drawn .spine-ticks li:nth-child(3) { transition-delay: 760ms; }
.spine.drawn .spine-ticks li:nth-child(4) { transition-delay: 1040ms; }
.spine.drawn .spine-ticks li:nth-child(5) { transition-delay: 1320ms; }
.spine.drawn .spine-ticks li:nth-child(6) { transition-delay: 1600ms; }
.spine.drawn .spine-ticks li:nth-child(7) { transition-delay: 1880ms; }

.tick {
    width: 12px;
    height: 1px;
    background: var(--iron-gall);
    display: inline-block;
}

.year {
    font-family: 'Cormorant Infant', 'Cormorant Garamond', serif;
    font-style: italic;
    font-weight: 300;
    font-size: 0.84rem;
    color: var(--iron-gall);
    letter-spacing: -0.015em;
    line-height: 0.92;
}

/* Hide spine on small screens */
@media (max-width: 720px) {
    .spine { display: none; }
}

/* ==========================================================================
   Board / Layout
   ========================================================================== */

.board {
    position: relative;
    z-index: 2;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem 0 calc(56px + 80px + 1rem);
}

@media (max-width: 720px) {
    .board {
        padding: 0 1.2rem;
    }
}

.strata {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: 1.6rem;
    padding: 4rem 0;
    position: relative;
}

.strata.threshold {
    min-height: 70vh;
    align-content: center;
    padding: 6rem 0 3rem;
}

.strata.cluster {
    min-height: 100vh;
    align-content: center;
    padding: 4rem 0;
}

.strata.final-cell {
    min-height: 50vh;
    align-content: center;
    padding: 4rem 0 6rem;
    flex-direction: column;
    text-align: center;
}

@media (max-width: 720px) {
    .strata {
        grid-template-columns: 1fr;
        gap: 1.4rem;
        padding: 3rem 0;
    }
    .strata .card { grid-column: 1 / -1 !important; }
}

.threshold-label {
    grid-column: 1 / -1;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.72rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--walnut);
    text-align: center;
    margin-bottom: 2rem;
    opacity: 0;
    transform: translateY(6px);
    transition: opacity 600ms var(--ease-soft), transform 600ms var(--ease-soft);
    transition-delay: 1800ms;
}

.threshold-label.shown {
    opacity: 1;
    transform: translateY(0);
}

/* ==========================================================================
   Specimen cards
   ========================================================================== */

.card {
    background: var(--vellum);
    border: 1px solid var(--vellum-border);
    box-shadow: 0 1px 2px rgba(95, 65, 30, 0.08);
    padding: 0;
    position: relative;
    cursor: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='18' height='14' viewBox='0 0 18 14'><path d='M2 7 L 16 7 M 14 4 L 16 7 L 14 10 M 4 7 L 4 5 M 4 9 L 4 7' stroke='%238a6a3f' stroke-width='1' fill='none' stroke-linecap='round'/></svg>") 2 7, pointer;
    opacity: 0.05;
    filter: blur(8px);
    transform: translateY(0) rotate(0deg);
    transition:
        opacity 1600ms var(--ease-soft),
        filter 1600ms var(--ease-soft),
        transform 320ms var(--ease-soft),
        box-shadow 320ms var(--ease-soft),
        background 320ms var(--ease-soft);
    border-radius: 1px;
    overflow: hidden;
}

.card.developed {
    opacity: 1;
    filter: blur(0);
}

.card.develop-overshoot {
    filter: contrast(1.04) blur(0);
}

.card:hover {
    transform: translateY(-2px) rotate(var(--card-rotate, 0deg));
    box-shadow: 0 4px 16px rgba(95, 65, 30, 0.12);
}

/* Acquisition strip */
.acquisition-strip {
    height: 28px;
    background: var(--wheat);
    color: var(--iron-gall);
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 0 14px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.72rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    border-bottom: 1px solid var(--vellum-border);
}

.accession {
    flex: 1 0 auto;
    color: var(--iron-gall);
}

.year-stamp {
    color: var(--walnut);
    font-weight: 500;
}

.glyph-mini {
    width: 22px;
    height: 22px;
    flex-shrink: 0;
}

/* Plate area */
.plate {
    padding: 22px 26px 18px;
    position: relative;
    min-height: 80px;
}

.plate .serif {
    font-family: 'Cormorant Garamond', Georgia, serif;
    font-size: clamp(1.02rem, 1.4vw, 1.18rem);
    line-height: 1.62;
    color: var(--walnut);
}

.plate .serif + .serif {
    text-indent: 1.4em;
    margin-top: 0;
}

.plate .serif em {
    font-style: italic;
    font-weight: 500;
    color: var(--walnut);
}

.plate .mono-body {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.92rem;
    line-height: 1.55;
    color: var(--walnut);
    margin-top: 8px;
}

.plate .caption-mono {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.78rem;
    line-height: 1.4;
    color: var(--pencil);
    margin-bottom: 10px;
    letter-spacing: 0.02em;
}

.plate .caveat-large {
    font-family: 'Caveat', cursive;
    font-size: 1.04rem;
    color: var(--pencil);
    line-height: 1.3;
    opacity: 0.85;
    margin-top: 12px;
}

.plate .faint-text {
    color: var(--walnut-soft);
    opacity: 0.5;
    font-style: italic;
}

.plate .italic {
    font-style: italic;
    font-weight: 500;
}

.plate .centerline {
    text-align: center;
    font-size: clamp(1.4rem, 2.4vw, 1.8rem);
    margin: 1.8rem 0;
    color: var(--walnut);
}

.plate-glyph {
    text-align: center;
    padding: 28px 26px 18px;
}

.big-glyph {
    width: 100%;
    max-width: 220px;
    height: auto;
    margin: 0 auto 10px;
    display: block;
}

.milestone-cap {
    font-family: 'Cormorant Infant', 'Cormorant Garamond', serif;
    font-style: italic;
    font-weight: 300;
    font-size: clamp(3.4rem, 6.8vw, 5.6rem);
    line-height: 0.92;
    letter-spacing: -0.015em;
    color: var(--iron-gall);
    float: left;
    margin: 0.05em 0.1em -0.1em 0;
}

/* Marginalia rail */
.marginalia {
    height: 28px;
    background: rgba(201, 169, 122, 0.35);
    border-top: 1px solid var(--vellum-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    padding: 0 14px;
    font-family: 'Caveat', cursive;
    font-size: 0.86rem;
    color: var(--pencil);
    opacity: 0.92;
}

.marginalia .caveat {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.marginalia em {
    font-style: italic;
}

/* Telomere length bar */
.telomere-bar {
    position: relative;
    width: 92px;
    height: 4px;
    flex-shrink: 0;
    cursor: help;
}

.bar-track {
    display: block;
    width: 100%;
    height: 100%;
    background: linear-gradient(to right,
        rgba(138, 106, 63, 0.3) 0%,
        rgba(138, 106, 63, 0.3) 100%);
    background-image: repeating-linear-gradient(to right,
        rgba(138, 106, 63, 0.3) 0,
        rgba(138, 106, 63, 0.3) 2px,
        transparent 2px,
        transparent 4px);
    position: relative;
    overflow: hidden;
}

.bar-fill {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 0%;
    background: var(--cinnabar);
    transition: width 1400ms var(--ease-soft);
}

.bar-tooltip {
    position: absolute;
    bottom: calc(100% + 6px);
    left: 50%;
    transform: translateX(-50%);
    background: var(--vellum);
    border: 1px solid var(--vellum-border);
    padding: 4px 8px;
    font-family: 'Caveat', cursive;
    font-size: 0.84rem;
    color: var(--pencil);
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 280ms var(--ease-soft);
    z-index: 10;
}

.telomere-bar:hover .bar-tooltip {
    opacity: 1;
}

/* Wax seal */
.wax-seal {
    position: absolute;
    bottom: 14px;
    right: 16px;
    width: 36px;
    height: 36px;
    display: block;
    pointer-events: none;
    filter: drop-shadow(0 1px 2px rgba(95, 65, 30, 0.18));
}

.wax-seal svg {
    width: 100%;
    height: 100%;
    display: block;
}

.wax-seal::before {
    content: '';
    position: absolute;
    inset: -2px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(168, 90, 50, 0.18) 0%, transparent 70%);
    z-index: -1;
}

.seal-mid {
    position: absolute;
    bottom: 50%;
    right: 14%;
    transform: translateY(50%);
}

.seal-final {
    position: relative;
    bottom: auto;
    right: auto;
    display: inline-block;
    margin: 0.5rem auto;
    transform: scale(1.4);
}

/* ==========================================================================
   Wave forms (interludes & cards)
   ========================================================================== */

.interlude {
    position: relative;
    width: 100%;
    background: var(--cream);
    padding: 4rem 0 3rem;
    text-align: center;
    grid-column: 1 / -1;
    display: block;
}

.wave-band {
    width: 100%;
    height: 120px;
    max-width: 800px;
    display: block;
    margin: 0 auto;
    overflow: visible;
}

.wave-band path,
.wave-trace path {
    fill: none;
    stroke: var(--dust-light);
    stroke-width: 1;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.wave-band path {
    stroke-dashoffset: var(--wave-len, 1200);
    transition: stroke-dashoffset 2200ms var(--ease-soft);
}

.wave-band.drawn path {
    stroke-dashoffset: 0;
}

.wave-trace {
    width: 100%;
    height: 90px;
    max-width: 320px;
    display: block;
    margin: 8px auto;
    overflow: visible;
}

.wave-trace path {
    stroke-dashoffset: var(--wave-len, 800);
    transition: stroke-dashoffset 1800ms var(--ease-soft);
}

.card.developed .wave-trace path {
    stroke-dashoffset: 0;
}

.interlude-caption {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.78rem;
    color: var(--pencil);
    letter-spacing: 0.02em;
    margin-top: 18px;
    min-height: 1.4em;
}

.interlude-caption::after {
    content: '|';
    display: inline-block;
    color: var(--walnut);
    animation: caret-blink 880ms steps(2) infinite;
    margin-left: 1px;
    opacity: 0;
}

.interlude-caption.typing::after {
    opacity: 1;
}

@keyframes caret-blink {
    0%, 100% { opacity: 0; }
    50% { opacity: 1; }
}

/* ==========================================================================
   Progressive sepia / fading by stratum
   ========================================================================== */

.sepia-1 {
    filter: sepia(0.04) saturate(0.96) contrast(0.97);
}

.sepia-1 .plate .serif,
.sepia-1 .plate .mono-body {
    color: var(--walnut-soft);
}

.sepia-2 {
    filter: sepia(0.08) saturate(0.93) contrast(0.94);
}

.sepia-2 .plate .serif,
.sepia-2 .plate .mono-body {
    color: var(--walnut-soft);
    opacity: 0.92;
}

.sepia-3 {
    filter: sepia(0.13) saturate(0.88) contrast(0.91);
    position: relative;
}

.sepia-3 .plate .serif,
.sepia-3 .plate .mono-body {
    color: var(--walnut-soft);
    opacity: 0.6;
}

/* feathered bottom edge */
.sepia-3::after {
    content: '';
    position: absolute;
    bottom: 28px;
    left: 0;
    right: 0;
    height: 40%;
    background: linear-gradient(to bottom,
        transparent 0%,
        rgba(244, 236, 214, 0.25) 60%,
        rgba(244, 236, 214, 0.55) 100%);
    pointer-events: none;
    mix-blend-mode: lighten;
}

.sepia-final {
    filter: sepia(0.16) saturate(0.85) contrast(0.88);
    background: rgba(230, 214, 179, 0.7);
}

.sepia-final .plate .serif {
    color: var(--walnut-soft);
    opacity: 0.85;
}

.sepia-final .marginalia {
    background: rgba(201, 169, 122, 0.2);
}

.sepia-final .marginalia .caveat {
    text-align: center;
    color: var(--pencil);
    opacity: 0.9;
}

/* ==========================================================================
   Continue link
   ========================================================================== */

.continue-link {
    grid-column: 1 / -1;
    display: block;
    margin: 4rem auto 2rem;
    text-align: center;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.86rem;
    font-style: italic;
    color: var(--walnut);
    text-decoration: none;
    border-bottom: 1px solid var(--cinnabar);
    padding-bottom: 2px;
    width: max-content;
    transition: opacity 320ms var(--ease-soft), letter-spacing 600ms var(--ease-soft);
}

.continue-link:hover {
    letter-spacing: 0.04em;
    opacity: 0.85;
}

/* ==========================================================================
   Card-water effect for the damaged 1993 card
   ========================================================================== */

.card-water::before {
    content: '';
    position: absolute;
    inset: 0;
    pointer-events: none;
    background:
        radial-gradient(ellipse at 30% 60%, rgba(168, 90, 50, 0.08) 0%, transparent 35%),
        radial-gradient(ellipse at 75% 40%, rgba(122, 106, 82, 0.12) 0%, transparent 40%),
        radial-gradient(ellipse at 50% 85%, rgba(95, 65, 30, 0.06) 0%, transparent 30%);
    mix-blend-mode: multiply;
    z-index: 1;
}

.card-water .plate {
    position: relative;
    z-index: 2;
}

/* ==========================================================================
   Card rotation/offset application via custom properties
   ========================================================================== */

.card {
    --card-rotate: 0deg;
    --card-offset-x: 0px;
    --card-offset-y: 0px;
}

.card.developed {
    transform: translate(var(--card-offset-x), var(--card-offset-y)) rotate(var(--card-rotate));
}

.card.developed:hover {
    transform: translate(var(--card-offset-x), calc(var(--card-offset-y) - 2px)) rotate(var(--card-rotate));
}

/* ==========================================================================
   Mobile tweaks
   ========================================================================== */

@media (max-width: 720px) {
    .threshold-label { padding: 0 1rem; }
    .plate { padding: 18px 18px 14px; }
    .wax-seal { width: 30px; height: 30px; }
    .milestone-cap { font-size: 3rem; }
}