/* ============================================================
   archetypos.dev -- Styles
   A scholarly monograph rendered in gold, ink, and geometry
   ============================================================ */

/* --- CSS Custom Properties --- */
:root {
    --lamp-black: #0F0D0B;
    --bitumen: #1C1814;
    --antique-gold: #C9A84C;
    --tarnished-brass: #8B7A3E;
    --warm-parchment: #E8DFD0;
    --dust: #A39888;
    --muted-brown: #7A6B5D;
    --burnt-sienna: #8B4513;
    --aged-linen: #F5EFE3;

    --font-display: 'Cormorant Garamond', 'Georgia', serif;
    --font-body: 'Source Serif 4', 'Georgia', serif;
    --font-mono: 'DM Mono', 'Courier New', monospace;

    --outer-margin: 12vw;
    --gutter: 4vw;
}

/* --- Reset --- */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    background-color: var(--lamp-black);
    color: var(--warm-parchment);
    font-family: var(--font-body);
    font-size: clamp(1rem, 1.1vw, 1.15rem);
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* --- Grain Overlay --- */
#grain-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    pointer-events: none;
    z-index: 9999;
    mix-blend-mode: overlay;
    opacity: 0.06;
    filter: url(#grain);
}

/* --- Fold Line --- */
#fold-line {
    position: fixed;
    top: 0;
    left: 50%;
    width: 1px;
    height: 100vh;
    background-color: #3D3228;
    opacity: 0.15;
    z-index: 10;
    pointer-events: none;
    transform: translateX(-0.5px);
}

@media (max-width: 768px) {
    #fold-line {
        display: none;
    }
}

/* --- Navigation: Contents --- */
#contents-nav {
    position: fixed;
    top: 2rem;
    left: 2rem;
    z-index: 100;
}

#contents-toggle {
    background: none;
    border: none;
    color: var(--muted-brown);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.04em;
    cursor: pointer;
    padding: 0.5rem 0;
    text-transform: uppercase;
    transition: color 400ms ease-out;
}

#contents-toggle:hover {
    color: var(--antique-gold);
}

#contents-list {
    list-style: none;
    display: none;
    margin-top: 1rem;
    padding-left: 0;
}

#contents-list.open {
    display: block;
}

#contents-list li {
    margin-bottom: 0.6rem;
}

#contents-list li a {
    color: var(--dust);
    text-decoration: none;
    font-family: var(--font-body);
    font-size: 0.85rem;
    transition: color 400ms ease-out;
    display: block;
}

#contents-list li a::before {
    content: attr(data-section) ". ";
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--tarnished-brass);
    margin-right: 0.4rem;
}

#contents-list li a:hover {
    color: var(--antique-gold);
}

/* --- Spread (Section) Base --- */
.spread {
    min-height: 100vh;
    padding: 0 var(--outer-margin);
    position: relative;
    counter-increment: folio;
    display: flex;
    align-items: center;
}

.spread-inner {
    width: 100%;
    max-width: 100%;
}

/* --- Folio Numbers (Page Numbers) --- */
.spread::after {
    position: absolute;
    bottom: 2rem;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--dust);
    letter-spacing: 0.04em;
}

.spread:nth-child(odd)::after {
    right: 2rem;
    content: counter(folio);
}

.spread:nth-child(even)::after {
    left: 2rem;
    content: counter(folio);
}

/* --- Running Headers --- */
.running-header {
    position: absolute;
    top: 1.5rem;
    left: var(--outer-margin);
    right: var(--outer-margin);
    display: flex;
    justify-content: space-between;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--muted-brown);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

/* --- Folio Grid (Two-Column Spread) --- */
.folio-grid {
    display: grid;
    grid-template-columns: 1fr var(--gutter) 1fr;
    gap: 0;
    align-items: start;
    padding-top: 4rem;
    padding-bottom: 3rem;
}

.verso,
.recto {
    max-width: 100%;
}

.verso {
    padding-right: 1rem;
}

.recto {
    padding-left: 1rem;
}

.gutter {
    /* Visual spacer -- the fold line provides the visual cue */
}

/* --- Typography --- */
h1, h2, h3 {
    font-family: var(--font-display);
    line-height: 1.1;
}

h2 {
    font-size: clamp(1.6rem, 3vw, 2.8rem);
    font-weight: 700;
    color: var(--warm-parchment);
    margin-bottom: 1.5rem;
}

p {
    max-width: 65ch;
    margin-bottom: 1.2em;
}

em {
    font-style: italic;
}

/* --- Heading Underline-Draw Animation --- */
.heading-draw {
    background-image: linear-gradient(var(--antique-gold), var(--antique-gold));
    background-repeat: no-repeat;
    background-position: 0 100%;
    background-size: 0% 2px;
    transition: background-size 600ms ease-out;
    display: inline;
    padding-bottom: 4px;
}

.heading-draw.visible {
    background-size: 100% 2px;
}

/* --- Drop Capitals --- */
.drop-cap {
    float: left;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 4em;
    line-height: 0.8;
    margin-right: 0.1em;
    margin-top: 0.05em;
    color: var(--antique-gold);
}

/* --- Section Markers --- */
.section-marker {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--tarnished-brass);
    letter-spacing: 0.06em;
    text-transform: uppercase;
    margin-bottom: 1rem;
}

.section-number {
    font-family: var(--font-mono);
    font-size: 2rem;
    color: var(--tarnished-brass);
    margin-bottom: 1rem;
    letter-spacing: 0.04em;
}

/* ============================================================
   TITLE PAGE
   ============================================================ */
#title-page {
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.title-page-content {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.title-main {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: clamp(2.8rem, 6vw, 5.5rem);
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--antique-gold);
    opacity: 0;
    animation: fadeIn 800ms ease 0.3s forwards;
}

.title-rule {
    width: 30vw;
    height: 1px;
    background-color: var(--tarnished-brass);
    margin: 1.5rem 0;
    opacity: 0;
    animation: fadeIn 800ms ease 1.2s forwards;
}

.title-subtitle {
    font-family: var(--font-body);
    font-size: 1.1rem;
    color: var(--warm-parchment);
    opacity: 0;
    animation: fadeIn 800ms ease 1.8s forwards;
    max-width: none;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ============================================================
   DIAGRAMS (SVG)
   ============================================================ */
.diagram-container {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.diagram-svg {
    width: 100%;
    max-width: 400px;
    height: auto;
    overflow: visible;
}

.diagram-large {
    max-width: 520px;
}

.diagram-line {
    fill: none;
    stroke: var(--antique-gold);
    stroke-width: 1;
    stroke-dasharray: 2000;
    stroke-dashoffset: 2000;
    transition: stroke-dashoffset 1.2s ease-out;
}

.diagram-dashed {
    fill: none;
    stroke: var(--antique-gold);
    stroke-width: 1;
    stroke-dasharray: 4 8;
    opacity: 0;
    transition: opacity 800ms ease-out;
}

.diagram-highlight {
    fill: var(--antique-gold);
    fill-opacity: 0.08;
    stroke: var(--antique-gold);
    stroke-width: 1;
    opacity: 0;
    transition: opacity 800ms ease-out;
}

.diagram-label {
    font-family: var(--font-mono);
    font-size: 10px;
    fill: var(--dust);
    text-anchor: middle;
    letter-spacing: 0.08em;
    opacity: 0;
    transition: opacity 600ms ease-out;
}

.diagram-label.center-label {
    font-size: 11px;
    fill: var(--antique-gold);
    font-weight: 400;
}

.mandala-center {
    font-size: 13px;
}

/* Animated state */
.diagram-line.drawn {
    stroke-dashoffset: 0;
}

.diagram-dashed.drawn {
    opacity: 1;
}

.diagram-highlight.drawn {
    opacity: 1;
}

.diagram-label.drawn {
    opacity: 1;
}

.diagram-caption {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--dust);
    text-align: center;
    margin-top: 1.5rem;
    letter-spacing: 0.02em;
    max-width: 40ch;
}

.diagram-caption-center {
    max-width: 50ch;
}

/* ============================================================
   INVERTED SPREAD (Chapter 02)
   ============================================================ */
.spread-inverted {
    background-color: var(--aged-linen);
    color: var(--lamp-black);
}

.spread-inverted h2 {
    color: var(--lamp-black);
}

.spread-inverted .heading-draw {
    background-image: linear-gradient(var(--burnt-sienna), var(--burnt-sienna));
}

.spread-inverted .drop-cap {
    color: var(--burnt-sienna);
}

.spread-inverted .section-number {
    color: var(--burnt-sienna);
}

.spread-inverted .running-header {
    color: var(--dust);
}

.spread-inverted .diagram-inverted .diagram-line {
    stroke: var(--lamp-black);
}

.spread-inverted .diagram-inverted .diagram-dashed {
    stroke: var(--burnt-sienna);
}

.spread-inverted .diagram-inverted .diagram-highlight {
    fill: var(--burnt-sienna);
    fill-opacity: 0.08;
    stroke: var(--burnt-sienna);
}

.spread-inverted .diagram-inverted .diagram-label {
    fill: var(--dust);
}

.spread-inverted .diagram-inverted .diagram-label.center-label {
    fill: var(--burnt-sienna);
}

.spread-inverted .diagram-caption {
    color: var(--dust);
}

.spread-inverted::after {
    color: var(--dust);
}

/* ============================================================
   FULL-BLEED FIGURES SPREAD
   ============================================================ */
.spread-fullbleed {
    justify-content: center;
}

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

.diagram-centerpiece {
    width: 70vw;
    max-width: 600px;
}

.diagram-centerpiece .diagram-svg {
    max-width: 100%;
}

/* ============================================================
   MARGINALIA
   ============================================================ */
.marginalia {
    margin-top: 2.5rem;
    padding-left: 1.2rem;
    border-left: 2px solid var(--tarnished-brass);
}

.margin-note {
    font-family: var(--font-body);
    font-style: italic;
    font-size: 0.9rem;
    color: var(--dust);
    max-width: 45ch;
    margin-bottom: 0.5em;
}

.margin-cite {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--tarnished-brass);
}

/* ============================================================
   COLOPHON
   ============================================================ */
#colophon {
    justify-content: center;
}

.colophon-content {
    display: flex;
    justify-content: center;
}

.colophon-text {
    text-align: center;
    max-width: 40ch;
}

.colophon-body {
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--warm-parchment);
    margin-bottom: 1.5rem;
    letter-spacing: 0.06em;
}

.colophon-detail {
    font-family: var(--font-body);
    font-size: 0.9rem;
    color: var(--dust);
    margin-bottom: 0.4em;
    max-width: none;
}

/* Ornamental Rule */
.ornamental-rule {
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 2rem 0;
    gap: 0;
}

.ornament-line {
    display: inline-block;
    width: 2.5rem;
    height: 1px;
    background-color: var(--tarnished-brass);
}

.ornament-diamond {
    font-size: 0.55rem;
    color: var(--tarnished-brass);
    margin: 0 0.3rem;
    line-height: 1;
}

.colophon-copyright {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--dust);
    letter-spacing: 0.04em;
    max-width: none;
}

/* ============================================================
   RESPONSIVE (below 768px)
   ============================================================ */
@media (max-width: 768px) {
    :root {
        --outer-margin: 6vw;
    }

    .spread {
        min-height: auto;
        padding-top: 4rem;
        padding-bottom: 4rem;
    }

    #title-page {
        min-height: 100vh;
        padding-top: 0;
        padding-bottom: 0;
    }

    .folio-grid {
        grid-template-columns: 1fr;
        padding-top: 3rem;
    }

    .gutter {
        display: none;
    }

    .verso {
        padding-right: 0;
    }

    .recto {
        padding-left: 0;
        margin-top: 3rem;
    }

    .running-header {
        left: 6vw;
        right: 6vw;
    }

    .section-number {
        font-size: 1.4rem;
    }

    .diagram-centerpiece {
        width: 90vw;
    }

    #contents-nav {
        top: 1rem;
        left: 1rem;
    }

    .spread::after {
        bottom: 1rem;
    }

    .spread:nth-child(odd)::after {
        right: 1rem;
    }

    .spread:nth-child(even)::after {
        left: 1rem;
    }
}

/* ============================================================
   LINK STYLES
   ============================================================ */
a {
    color: var(--warm-parchment);
    text-decoration: none;
    background-image: linear-gradient(var(--antique-gold), var(--antique-gold));
    background-repeat: no-repeat;
    background-position: 0 100%;
    background-size: 0% 1px;
    transition: color 400ms ease-out, background-size 600ms ease-out;
}

a:hover {
    color: var(--antique-gold);
    background-size: 100% 1px;
}

/* ============================================================
   SELECTION
   ============================================================ */
::selection {
    background-color: var(--antique-gold);
    color: var(--lamp-black);
}