/* ==========================================================================
   sbom.wiki — Light-Academia Catalog
   Palette: #FAF6F0 #F2EBE0 #D4C5A9 #C4A882 #8B7355 #3D2B1F #2A1F14
   Fonts:   DM Serif Display, Source Serif 4, Inconsolata (Google Fonts)
   ========================================================================== */

:root {
    --parchment: #FAF6F0;
    --aged-cream: #F2EBE0;
    --foxed-sepia: #D4C5A9;
    --catalog-gold: #C4A882;
    --tarnished-brass: #8B7355;
    --walnut-ink: #3D2B1F;
    --ink-shadow: #2A1F14;

    --font-display: "DM Serif Display", "Source Serif 4", Georgia, serif;
    --font-body: "Source Serif 4", Georgia, "Times New Roman", serif;
    --font-mono: "Inconsolata", "Courier New", monospace;

    --column: 720px;
    --column-pad: clamp(1.5rem, 4vw, 3rem);
}

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

html {
    scroll-behavior: smooth;
    background: var(--parchment);
}

body {
    font-family: var(--font-body);
    font-size: clamp(1rem, 1.1vw, 1.15rem);
    line-height: 1.72;
    color: var(--walnut-ink);
    background: var(--parchment);
    min-height: 100vh;
    position: relative;
    overflow-x: hidden;
    font-feature-settings: "liga", "kern", "onum";
}

/* Paper grain / noise overlay (SVG data URI, ~3% opacity) */
.paper-grain {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 1;
    opacity: 0.035;
    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='0.85' numOctaves='2' seed='7'/><feColorMatrix type='matrix' values='0 0 0 0 0.24  0 0 0 0 0.17  0 0 0 0 0.12  0 0 0 1 0'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
    background-size: 240px 240px;
    mix-blend-mode: multiply;
}

/* A subtle warm vignette — sunlight through leaded glass */
body::before {
    content: "";
    position: fixed;
    inset: 0;
    background:
        radial-gradient(ellipse 70% 50% at 50% 0%, rgba(212, 197, 169, 0.35), transparent 60%),
        radial-gradient(ellipse 60% 40% at 50% 100%, rgba(196, 168, 130, 0.18), transparent 60%);
    pointer-events: none;
    z-index: 0;
}

/* ==========================================================================
   Reading Column
   ========================================================================== */

.reading-column {
    position: relative;
    z-index: 2;
    max-width: var(--column);
    margin: 0 auto;
    padding: 0 var(--column-pad);
}

.card {
    padding: clamp(3rem, 8vw, 6rem) 0;
    opacity: 0;
    transform: translateY(18px);
    transition: opacity 700ms ease, transform 700ms ease;
}

.card.is-visible {
    opacity: 1;
    transform: none;
}

.card-eyebrow {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--tarnished-brass);
    margin-bottom: 0.9rem;
}

.card-title {
    font-family: var(--font-display);
    font-weight: 400;
    color: var(--walnut-ink);
    font-size: clamp(1.9rem, 3.6vw, 2.6rem);
    line-height: 1.1;
    margin-bottom: 1.4rem;
    letter-spacing: -0.005em;
}

.card-title.small-title {
    font-size: clamp(1.6rem, 3vw, 2.1rem);
}

.card-lede {
    font-family: var(--font-body);
    font-style: italic;
    font-size: clamp(1.05rem, 1.4vw, 1.2rem);
    color: var(--tarnished-brass);
    margin-bottom: 2rem;
    line-height: 1.6;
}

.card-body {
    margin-bottom: 1.4rem;
    color: var(--walnut-ink);
}

.card-body em {
    font-style: italic;
    font-weight: 600;
    color: var(--ink-shadow);
}

.card-header {
    margin-bottom: 2.5rem;
}

.card-mark {
    display: inline-block;
    margin-bottom: 1.2rem;
    opacity: 0.9;
}

/* ==========================================================================
   Section Dividers — diamonds
   ========================================================================== */

.section-divider {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1.2rem;
    padding: 1.5rem 0;
    opacity: 0.8;
}

.section-divider .diamond,
.archive-rule .diamond {
    display: inline-block;
    width: 6px;
    height: 6px;
    background: var(--tarnished-brass);
    transform: rotate(45deg);
}

.archive-rule .dot {
    display: inline-block;
    width: 3px;
    height: 3px;
    border-radius: 50%;
    background: var(--catalog-gold);
}

.archive-rule {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.75rem;
    padding: 2rem 0 1.5rem;
}

/* ==========================================================================
   Card I — Frontispiece
   ========================================================================== */

.card-frontispiece {
    min-height: 85vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding-top: clamp(4rem, 10vh, 8rem);
    padding-bottom: clamp(4rem, 10vh, 8rem);
    background:
        radial-gradient(ellipse at center, rgba(212, 197, 169, 0.25) 0%, transparent 70%);
    position: relative;
}

.frontispiece-ornament {
    display: flex;
    justify-content: center;
    align-items: center;
}

.top-ornament {
    margin-bottom: clamp(2.5rem, 6vh, 4rem);
}

.bottom-ornament {
    margin-top: clamp(2.5rem, 6vh, 4rem);
}

.dotted-rule {
    display: flex;
    gap: 10px;
    align-items: center;
    justify-content: center;
}

.dotted-rule span {
    width: 3px;
    height: 3px;
    border-radius: 50%;
    background: var(--catalog-gold);
}

.dotted-rule span:nth-child(5) {
    width: 6px;
    height: 6px;
    background: var(--tarnished-brass);
    transform: rotate(45deg);
    border-radius: 0;
}

.frontispiece-content {
    max-width: 620px;
}

.folio-line {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--tarnished-brass);
    margin-bottom: 1.8rem;
}

.site-title {
    font-family: var(--font-display);
    font-weight: 400;
    font-size: clamp(2.4rem, 5.5vw, 4.2rem);
    line-height: 1;
    color: var(--ink-shadow);
    margin-bottom: 1.6rem;
    letter-spacing: -0.015em;
}

.title-dot {
    color: var(--catalog-gold);
    font-style: italic;
}

.subtitle {
    font-family: var(--font-body);
    font-style: italic;
    font-size: clamp(1.05rem, 1.5vw, 1.25rem);
    color: var(--walnut-ink);
    line-height: 1.55;
    margin-bottom: 2.4rem;
    max-width: 46ch;
    margin-left: auto;
    margin-right: auto;
    opacity: 0;
    transition: opacity 900ms ease 200ms;
}

.subtitle.revealed {
    opacity: 1;
    animation: pulse-attention 3s ease-in-out 1400ms infinite;
}

.frontispiece-meta {
    display: inline-flex;
    align-items: center;
    gap: 0.9rem;
    padding-top: 1rem;
    border-top: 1px solid var(--foxed-sepia);
}

.meta-item {
    font-family: var(--font-mono);
    font-size: 0.82rem;
    letter-spacing: 0.1em;
    color: var(--tarnished-brass);
    text-transform: uppercase;
}

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

/* ==========================================================================
   Card II — Manifest
   ========================================================================== */

.card-manifest {
    border-top: 1px solid var(--foxed-sepia);
    border-bottom: 1px solid var(--foxed-sepia);
}

.manifest-list {
    margin: 2.5rem 0;
    border-top: 1px solid var(--foxed-sepia);
    border-bottom: 1px solid var(--foxed-sepia);
}

.manifest-row {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    padding: 0.95rem 1.1rem;
    gap: 1.5rem;
    border-bottom: 1px solid rgba(196, 168, 130, 0.35);
    transition: background-color 300ms ease, transform 300ms ease;
}

.manifest-row:last-child {
    border-bottom: none;
}

.manifest-row:nth-child(odd) {
    background: var(--parchment);
}

.manifest-row:nth-child(even) {
    background: var(--aged-cream);
}

.manifest-row:hover {
    background: var(--foxed-sepia);
    transform: translateX(2px);
}

.manifest-label {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--tarnished-brass);
    flex-shrink: 0;
}

.manifest-value {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--walnut-ink);
    text-align: right;
    font-feature-settings: "tnum";
}

.manifest-value.hash {
    color: var(--ink-shadow);
    font-weight: 500;
    letter-spacing: 0.05em;
}

/* ==========================================================================
   Card III — Provenance
   ========================================================================== */

.card-provenance {
    position: relative;
    background:
        linear-gradient(to bottom,
            rgba(242, 235, 224, 0) 0%,
            rgba(242, 235, 224, 0.6) 10%,
            rgba(242, 235, 224, 0.6) 90%,
            rgba(242, 235, 224, 0) 100%);
    padding-left: clamp(0rem, 3vw, 2rem);
    padding-right: clamp(0rem, 3vw, 2rem);
}

.provenance-flank {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    opacity: 0.55;
}

.provenance-flank-left {
    left: -44px;
}

.provenance-flank-right {
    right: -44px;
}

.provenance-content {
    position: relative;
}

.drop-cap .drop {
    font-family: var(--font-display);
    font-size: 3.4em;
    line-height: 0.85;
    float: left;
    padding-right: 0.1em;
    padding-top: 0.08em;
    color: var(--ink-shadow);
}

.pullquote {
    margin: 2.4rem 1rem;
    padding: 1.4rem 1.6rem;
    border-left: 2px solid var(--catalog-gold);
    font-family: var(--font-display);
    font-size: clamp(1.15rem, 1.8vw, 1.4rem);
    line-height: 1.5;
    color: var(--walnut-ink);
    font-style: italic;
}

.pullquote p {
    margin-bottom: 0.6rem;
}

.pullquote footer {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-style: normal;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--tarnished-brass);
}

/* ==========================================================================
   Card IV — Archive (Footer)
   ========================================================================== */

.card-archive {
    text-align: center;
    border-top: 1px solid var(--foxed-sepia);
    padding-bottom: 4rem;
}

.archive-lede {
    max-width: 52ch;
    margin: 0 auto 2rem;
    font-style: italic;
    color: var(--tarnished-brass);
}

.archive-nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 0.7rem 0.9rem;
    margin: 1.5rem 0 1rem;
}

.archive-link {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--tarnished-brass);
    text-decoration: underline;
    text-decoration-color: var(--foxed-sepia);
    text-underline-offset: 4px;
    transition: color 250ms ease, text-decoration-color 250ms ease;
}

.archive-link:hover {
    color: var(--ink-shadow);
    text-decoration-color: var(--catalog-gold);
}

.archive-sep {
    color: var(--catalog-gold);
    font-size: 0.85rem;
}

.colophon {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    letter-spacing: 0.04em;
    color: var(--tarnished-brass);
    line-height: 1.7;
    max-width: 52ch;
    margin: 1rem auto 0;
}

.colophon .mono {
    color: var(--walnut-ink);
}

/* ==========================================================================
   Pulse-Attention Animation (metrics)
   ========================================================================== */

.metric {
    animation: pulse-attention 3s ease-in-out infinite;
    animation-delay: var(--delay, 0s);
    will-change: opacity;
}

@keyframes pulse-attention {
    0%, 100% {
        opacity: 0.7;
    }
    50% {
        opacity: 1;
    }
}

/* ==========================================================================
   Subtitle letter-by-letter reveal
   ========================================================================== */

.subtitle .letter {
    display: inline-block;
    opacity: 0;
    transform: translateY(4px);
    transition: opacity 380ms ease, transform 380ms ease;
}

.subtitle .letter.in {
    opacity: 1;
    transform: none;
}

.subtitle .space {
    display: inline-block;
    width: 0.28em;
}

/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 600px) {
    .reading-column {
        padding: 0 1.25rem;
    }

    .card-frontispiece {
        min-height: 80vh;
    }

    .provenance-flank {
        display: none;
    }

    .manifest-row {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.3rem;
        padding: 0.8rem 0.9rem;
    }

    .manifest-value {
        text-align: left;
    }

    .pullquote {
        margin: 2rem 0;
    }

    .frontispiece-meta {
        flex-wrap: wrap;
        justify-content: center;
        gap: 0.5rem;
    }

    .archive-nav {
        gap: 0.5rem 0.7rem;
    }
}

@media (max-width: 420px) {
    .site-title {
        font-size: clamp(2rem, 10vw, 2.8rem);
    }

    .card-title {
        font-size: clamp(1.6rem, 6vw, 2.1rem);
    }
}