/* =========================================================
   tanso.news — Carbon Research Journal
   Isometric / single-column / deep-burgundy / scholarly
   ========================================================= */

:root {
    --vellum: #FDF6F0;
    --parchment: #F5E6D0;
    --gold: #D4A574;
    --burgundy-deep: #3C1518;
    --burgundy-med: #6B2D35;
    --burgundy-bright: #A4343A;
    --burgundy-near-black: #1A0E12;

    --font-display: "Spectral", "Times New Roman", Georgia, serif;
    --font-body: "Spectral", "Times New Roman", Georgia, serif;
    --font-mono: "Inconsolata", "Courier New", monospace;

    --col-width: 54ch;
    --col-width-narrow: 42ch;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background: var(--vellum);
    color: var(--burgundy-deep);
    font-family: var(--font-body);
    font-size: 1.05rem;
    line-height: 1.82;
    letter-spacing: 0.008em;
    font-weight: 400;
    overflow-x: hidden;
    min-height: 100vh;
}

section {
    position: relative;
    padding: clamp(4rem, 8vh, 6rem) 1.5rem;
    margin-bottom: clamp(4rem, 8vh, 6rem);
}

.section-inner,
.masthead-inner,
.colophon-inner {
    width: 100%;
    max-width: var(--col-width);
    margin: 0 auto;
}

.colophon-inner {
    max-width: var(--col-width-narrow);
}

/* =========================================================
   Kinetic typography
   ========================================================= */
.kinetic span {
    display: inline-block;
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 0.3s ease, transform 0.3s ease;
    transition-delay: calc(var(--char-index) * 0.04s);
    white-space: pre;
}

.kinetic.visible span {
    opacity: 1;
    transform: translateY(0);
}

/* =========================================================
   Section 1 — Masthead
   ========================================================= */
.masthead {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(180deg, var(--vellum) 0%, var(--vellum) 60%, #F7EADB 100%);
    position: relative;
    padding-top: 8vh;
    padding-bottom: 8vh;
}

.masthead::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
        repeating-linear-gradient(
            90deg,
            transparent 0,
            transparent 80px,
            rgba(60, 21, 24, 0.035) 80px,
            rgba(60, 21, 24, 0.035) 81px
        );
    pointer-events: none;
}

.masthead-inner {
    position: relative;
    text-align: left;
}

.masthead-meta {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--burgundy-med);
    display: flex;
    align-items: center;
    gap: 0.9rem;
    margin-bottom: 3.5rem;
}

.meta-dot {
    color: var(--gold);
    font-size: 0.9rem;
}

.hero-domain {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    letter-spacing: 0.04em;
    line-height: 1.05;
    color: var(--burgundy-deep);
    margin-bottom: 1.8rem;
}

.hero-rule {
    border: none;
    border-top: 1.5px solid var(--burgundy-deep);
    width: 40%;
    margin: 0 0 1.8rem 0;
}

.hero-subtitle {
    font-family: var(--font-display);
    font-style: italic;
    color: var(--burgundy-med);
    font-size: 1.05rem;
    line-height: 1.7;
    max-width: 44ch;
    margin-bottom: 3rem;
}

.hero-crystal {
    display: flex;
    justify-content: center;
    margin: 2rem 0 2.5rem;
}

.crystal-svg {
    width: min(320px, 80%);
    height: auto;
}

.crystal-line {
    stroke-dasharray: 600;
    stroke-dashoffset: 600;
    animation: drawLine 3s ease-out 0.6s forwards;
}

@keyframes drawLine {
    to {
        stroke-dashoffset: 0;
    }
}

.scroll-indicator {
    margin-top: 2rem;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--burgundy-med);
    animation: bob 2.6s ease-in-out infinite;
}

@keyframes bob {
    0%, 100% { transform: translateY(0); opacity: 0.85; }
    50%      { transform: translateY(6px); opacity: 1; }
}

/* =========================================================
   Generic section heading / label / lede
   ========================================================= */
.section-label {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--burgundy-med);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--burgundy-deep);
}

.label-hex {
    color: var(--burgundy-bright);
    font-size: 1.05rem;
    transform: rotate(0deg);
}

.section-heading {
    font-family: var(--font-display);
    font-weight: 800;
    font-size: clamp(1.8rem, 3.4vw, 2.6rem);
    letter-spacing: 0.01em;
    line-height: 1.18;
    color: var(--burgundy-deep);
    margin-bottom: 1.4rem;
}

.section-lede {
    font-family: var(--font-display);
    font-style: italic;
    color: var(--burgundy-med);
    font-size: 1.05rem;
    line-height: 1.75;
    margin-bottom: 3rem;
}

/* =========================================================
   Section 2 — Archive / Cards
   ========================================================= */
.archive {
    background: var(--vellum);
}

.archive-cards {
    display: flex;
    flex-direction: column;
    gap: 2.4rem;
}

.card {
    position: relative;
    width: 100%;
    min-height: 320px;
    perspective: 1400px;
    transform-style: preserve-3d;
    border-bottom: 1px solid var(--burgundy-deep);
    padding-bottom: 2.4rem;
}

.card-inner,
.card {
    /* card itself flips */
}

.card {
    transition: transform 0.9s cubic-bezier(0.68, -0.35, 0.265, 1.35);
    transform-style: preserve-3d;
}

.card.flipped {
    /* after flip, no more rotateX so back content flows naturally */
}

.card-face {
    width: 100%;
    min-height: 320px;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    transition: transform 0.9s cubic-bezier(0.68, -0.35, 0.265, 1.35),
                opacity 0.5s ease 0.4s;
    transform-origin: top center;
}

.card-front {
    position: absolute;
    inset: 0;
    background: var(--burgundy-deep);
    color: var(--burgundy-deep); /* text hidden by matching color */
    display: flex;
    align-items: flex-end;
    justify-content: flex-start;
    padding: 1.4rem 1.6rem;
    border: 1px solid var(--burgundy-near-black);
    box-shadow:
        inset 0 0 0 1px rgba(164, 52, 58, 0.2),
        0 1px 0 rgba(26, 14, 18, 0.4);
    transform: rotateX(0deg);
    z-index: 2;
}

.card-front::before {
    content: "";
    position: absolute;
    top: 14px;
    left: 14px;
    right: 14px;
    bottom: 14px;
    border: 1px dashed rgba(212, 165, 116, 0.25);
    pointer-events: none;
}

.card-seal {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--gold);
    opacity: 0.85;
}

.card-back {
    position: relative;
    background: var(--parchment);
    color: var(--burgundy-deep);
    padding: 1.8rem 1.9rem 2rem;
    border: 1px solid rgba(60, 21, 24, 0.25);
    transform: rotateX(-180deg);
    opacity: 0;
}

.card.flipped .card-front {
    transform: rotateX(180deg);
    opacity: 0;
    pointer-events: none;
}

.card.flipped .card-back {
    transform: rotateX(0deg);
    opacity: 1;
}

.card-meta {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin-bottom: 1rem;
    padding-bottom: 0.7rem;
    border-bottom: 1px solid rgba(60, 21, 24, 0.3);
}

.card-date {
    color: var(--gold);
    font-weight: 500;
}

.card-ref {
    color: var(--burgundy-med);
}

.card-headline {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(1.3rem, 2.5vw, 1.8rem);
    letter-spacing: 0.005em;
    line-height: 1.25;
    color: var(--burgundy-deep);
    margin-bottom: 1rem;
}

.card-abstract {
    font-family: var(--font-display);
    font-size: 1rem;
    line-height: 1.78;
    color: var(--burgundy-deep);
    margin-bottom: 1.3rem;
}

.card-tags {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem 1.2rem;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--burgundy-bright);
}

.card-tags li {
    position: relative;
    padding-left: 1.1rem;
}

.card-tags li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    width: 6px;
    height: 6px;
    background: var(--burgundy-bright);
    transform: translateY(-50%) rotate(45deg);
}

/* =========================================================
   Section 3 — Laboratory / City
   ========================================================= */
.laboratory {
    background: linear-gradient(180deg, var(--vellum) 0%, #F8EBDA 100%);
    padding-top: clamp(5rem, 9vh, 7rem);
    padding-bottom: clamp(5rem, 9vh, 7rem);
}

.city-wrap {
    width: 100%;
    max-width: 100%;
    margin: 2rem 0 2.5rem;
    padding: 1.5rem 0;
    background: transparent;
    position: relative;
}

.city-svg {
    width: 100%;
    height: auto;
    display: block;
    max-height: 520px;
}

.city-svg polygon {
    stroke-linejoin: round;
    stroke-linecap: round;
}

.city-svg .bldg-line {
    stroke-dasharray: 400;
    stroke-dashoffset: 400;
    transition: stroke-dashoffset 1.1s ease-out;
}

.city-svg .bldg-line.drawn {
    stroke-dashoffset: 0;
}

.city-svg .bldg-fill {
    opacity: 0;
    transition: opacity 0.7s ease 0.3s;
}

.city-svg .bldg-fill.drawn {
    opacity: 1;
}

.city-caption {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    letter-spacing: 0.1em;
    color: var(--burgundy-med);
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px dashed rgba(60, 21, 24, 0.3);
}

.caption-line {
    text-transform: lowercase;
}

.lab-footnote {
    font-family: var(--font-display);
    font-style: italic;
    font-size: 0.95rem;
    line-height: 1.75;
    color: var(--burgundy-med);
    margin-top: 1rem;
    padding-left: 1.2rem;
    border-left: 2px solid var(--burgundy-bright);
}

/* =========================================================
   Section 4 — Colophon
   ========================================================= */
.colophon {
    background: var(--vellum);
    padding-bottom: clamp(5rem, 10vh, 8rem);
}

.colophon-text {
    margin-bottom: 1.6rem;
    color: var(--burgundy-deep);
}

.atom-wrap {
    display: flex;
    justify-content: center;
    margin: 3rem 0 2.5rem;
}

.atom-svg {
    width: 180px;
    height: 180px;
}

.atom-rotator {
    transform-origin: 100px 100px;
    animation: atomRotate 18s linear infinite;
}

@keyframes atomRotate {
    from { transform: rotate(0deg); }
    to   { transform: rotate(360deg); }
}

.credits {
    display: grid;
    grid-template-columns: max-content 1fr;
    gap: 0.5rem 1.6rem;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    letter-spacing: 0.04em;
    color: var(--burgundy-deep);
    margin: 2.5rem 0 3rem;
    padding: 1.4rem 0;
    border-top: 1px solid var(--burgundy-deep);
    border-bottom: 1px solid var(--burgundy-deep);
}

.credits dt {
    color: var(--burgundy-med);
    text-transform: uppercase;
    letter-spacing: 0.14em;
}

.credits dd {
    color: var(--burgundy-deep);
}

.mono {
    font-family: var(--font-mono);
}

.final-mark {
    text-align: center;
    font-family: var(--font-display);
    font-style: italic;
    color: var(--burgundy-bright);
    letter-spacing: 0.6em;
    padding-left: 0.6em; /* compensate for letter-spacing */
    margin-top: 2rem;
}

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width: 600px) {
    body {
        font-size: 1rem;
    }

    :root {
        --col-width: 100%;
        --col-width-narrow: 100%;
    }

    .masthead-meta {
        flex-wrap: wrap;
        gap: 0.5rem;
    }

    .hero-rule {
        width: 60%;
    }

    .card-front,
    .card-back {
        padding: 1.3rem 1.4rem;
    }

    .credits {
        grid-template-columns: 1fr;
        gap: 0.1rem 0;
    }

    .credits dt {
        margin-top: 0.6rem;
    }
}