/* =============================================
   aiice.quest - Zen-Scholarly Library Catalog
   ============================================= */

/* --- CSS Custom Properties --- */
:root {
    --rice-paper: #F5F0E8;
    --deckle-cream: #EDE5D5;
    --aged-brass: #B8A088;
    --faded-ink: #5C5044;
    --dusty-rose: #C9A0A0;
    --celadon-mist: #B5C9B8;
    --slate-dusk: #7B8794;
    --deep-walnut: #3B2F24;
    --dusty-rose-dark: #B88888;
    --sepia-overlay: #D4C4A8;

    --font-mono: 'IBM Plex Mono', monospace;
    --font-display: 'Cormorant Garamond', 'Georgia', serif;
    --font-handwritten: 'Caveat', cursive;

    --transition-gentle: 400ms ease-out;
    --transition-quick: 300ms ease-out;
    --card-ease: cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-mono);
    font-weight: 400;
    font-size: 0.9375rem;
    line-height: 1.7;
    letter-spacing: 0.02em;
    color: var(--faded-ink);
    background-color: var(--rice-paper);
    overflow-x: hidden;
    position: relative;
}

/* --- Paper Texture Background --- */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    background-image:
        radial-gradient(circle at 20% 30%, rgba(184, 160, 136, 0.03) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(184, 160, 136, 0.03) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(184, 160, 136, 0.02) 0%, transparent 70%);
}

/* --- Bookmark Progress Ribbon --- */
#bookmark-ribbon {
    position: fixed;
    top: 0;
    left: 24px;
    width: 6px;
    height: 0;
    background: linear-gradient(to bottom, var(--dusty-rose), var(--dusty-rose-dark));
    z-index: 100;
    clip-path: polygon(0 0, 100% 0, 100% calc(100% - 6px), 50% 100%, 0 calc(100% - 6px));
    transition: height 50ms linear;
}

/* --- Navigation INDEX Trigger --- */
#nav-trigger {
    position: fixed;
    top: 32px;
    right: 32px;
    z-index: 200;
    cursor: pointer;
}

#index-label {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--faded-ink);
    letter-spacing: 0.2em;
    text-transform: uppercase;
    transition: color var(--transition-quick);
    cursor: pointer;
    user-select: none;
}

#index-label:hover {
    color: var(--dusty-rose);
}

/* --- Index Panel --- */
#index-panel {
    position: fixed;
    top: 0;
    right: -340px;
    width: 320px;
    height: 100vh;
    background-color: var(--deckle-cream);
    border-left: 1px solid var(--aged-brass);
    z-index: 300;
    padding: 48px 32px;
    transition: right var(--transition-gentle);
    overflow-y: auto;
}

#index-panel.open {
    right: 0;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
}

.panel-title {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 1.25rem;
    color: var(--deep-walnut);
    font-variant: small-caps;
    letter-spacing: 0.08em;
}

#panel-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--faded-ink);
    cursor: pointer;
    line-height: 1;
    padding: 4px;
    transition: color var(--transition-quick);
}

#panel-close:hover {
    color: var(--dusty-rose);
}

.toc-list {
    list-style: none;
}

.toc-item {
    margin-bottom: 20px;
}

.toc-link {
    display: flex;
    align-items: baseline;
    text-decoration: none;
    color: var(--faded-ink);
    transition: color var(--transition-quick);
    font-family: var(--font-mono);
    font-size: 0.875rem;
}

.toc-link:hover {
    color: var(--dusty-rose);
}

.toc-name {
    font-variant: small-caps;
    letter-spacing: 0.1em;
    white-space: nowrap;
}

.toc-dots {
    flex: 1;
    border-bottom: 1px dotted var(--aged-brass);
    margin: 0 8px;
    min-width: 20px;
    position: relative;
    top: -4px;
}

.toc-page {
    font-style: italic;
    color: var(--slate-dusk);
    white-space: nowrap;
}

/* --- Panel Overlay --- */
#panel-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(59, 47, 36, 0.2);
    z-index: 250;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-gentle);
}

#panel-overlay.visible {
    opacity: 1;
    pointer-events: auto;
}

/* --- Frontispiece --- */
#frontispiece {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 60px 8%;
    position: relative;
    z-index: 1;
}

.frontispiece-content {
    text-align: center;
    opacity: 0;
    transform: translateY(10px);
    animation: frontispiece-enter 1200ms ease-out 200ms forwards;
}

@keyframes frontispiece-enter {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.site-title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(2.5rem, 6vw, 5rem);
    color: var(--deep-walnut);
    letter-spacing: 0.08em;
    line-height: 1.2;
    margin-bottom: 24px;
}

.title-rule {
    width: 120px;
    height: 1px;
    background-color: var(--aged-brass);
    margin: 0 auto 24px;
}

.epigraph {
    font-family: var(--font-mono);
    font-weight: 300;
    font-size: 0.875rem;
    color: var(--faded-ink);
    max-width: 480px;
    margin: 0 auto;
    line-height: 1.8;
}

/* --- Chapter Sections --- */
.chapter {
    padding: 80px 8% 40px;
    position: relative;
    z-index: 1;
}

.chapter-heading {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-bottom: 48px;
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 600ms ease-out, transform 600ms ease-out;
}

.chapter-heading.visible {
    opacity: 1;
    transform: translateY(0);
}

.chapter-rule {
    display: block;
    height: 1px;
    background-color: var(--aged-brass);
    width: 0;
    transition: width 600ms ease-out;
}

.chapter-heading.visible .chapter-rule {
    width: 80px;
}

.chapter-title {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 1.5rem;
    font-variant: small-caps;
    letter-spacing: 0.15em;
    color: var(--deep-walnut);
    white-space: nowrap;
}

/* --- Page Numbers --- */
.page-number {
    position: absolute;
    top: 80px;
    right: 4%;
    z-index: 2;
}

.page-number span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border: 1px solid var(--aged-brass);
    border-radius: 50%;
    font-family: var(--font-mono);
    font-weight: 300;
    font-size: 0.75rem;
    color: var(--slate-dusk);
}

/* --- Card Grid --- */
.card-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    max-width: 1200px;
    margin: 0 auto;
}

/* --- Individual Cards --- */
.card {
    background-color: var(--deckle-cream);
    border: 1px solid var(--aged-brass);
    border-radius: 4px;
    padding: 32px 24px 24px;
    position: relative;
    box-shadow: 0 2px 8px rgba(138, 120, 96, 0.12);
    transition:
        box-shadow var(--transition-gentle),
        transform var(--transition-gentle),
        border-color var(--transition-gentle);
    opacity: 0;
    transform: translateY(15px);
}

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

.card:hover {
    box-shadow: 0 4px 16px rgba(138, 120, 96, 0.18);
    transform: translateY(-2px);
    border-color: var(--dusty-rose);
}

.card.visible:hover {
    transform: translateY(-2px);
}

/* Card Header Line (red rule at top mimicking catalog card) */
.card-header-line {
    position: absolute;
    top: 24px;
    left: 16px;
    right: 16px;
    height: 1px;
    background-color: var(--dusty-rose);
}

.card-title {
    font-family: var(--font-mono);
    font-weight: 500;
    font-size: 0.875rem;
    color: var(--deep-walnut);
    margin-bottom: 16px;
    padding-bottom: 8px;
    position: relative;
    z-index: 1;
}

.card-body {
    position: relative;
    z-index: 1;
    padding-top: 4px;
}

.card-body p {
    margin-bottom: 12px;
    font-size: 0.8125rem;
    line-height: 1.6;
    color: var(--faded-ink);
}

.card-body p:last-child {
    margin-bottom: 0;
}

.card-body em {
    font-style: italic;
}

/* Full card spans more space */
.full-card {
    grid-column: span 2;
}

/* Half card takes single column */
.half-card {
    grid-column: span 1;
}

/* --- Card Metadata with Dotted Leaders --- */
.card-meta {
    display: flex;
    align-items: baseline;
    font-size: 0.8125rem;
    line-height: 1.6;
}

.meta-label {
    color: var(--slate-dusk);
    font-size: 0.75rem;
    white-space: nowrap;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.meta-dots {
    flex: 1;
    border-bottom: 1px dotted var(--aged-brass);
    margin: 0 8px;
    min-width: 16px;
    position: relative;
    top: -3px;
}

.meta-value {
    color: var(--faded-ink);
    font-size: 0.8125rem;
    white-space: nowrap;
}

/* --- Decorative Marginalia Glyphs --- */
.marginalia-glyphs {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 2;
    display: none;
}

.glyph {
    position: absolute;
    font-family: var(--font-display);
    font-size: 1.25rem;
    color: var(--aged-brass);
    opacity: 0.5;
    animation: glyph-float 4s ease-in-out infinite;
}

.glyph-left {
    left: 3%;
}

.glyph-right {
    right: 3%;
}

.glyph:nth-child(even) {
    animation-delay: -2s;
}

@keyframes glyph-float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-3px); }
}

/* --- Handwritten Marginalia Notes --- */
.handwritten-notes {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 2;
    display: none;
}

.handnote {
    position: absolute;
    font-family: var(--font-handwritten);
    font-size: 0.875rem;
    color: var(--faded-ink);
    opacity: 0.4;
    transform: rotate(-2deg);
    white-space: nowrap;
}

/* --- Colophon / Footer --- */
#colophon {
    padding: 80px 8% 60px;
    text-align: center;
    position: relative;
    z-index: 1;
}

.colophon-rule {
    width: 60%;
    max-width: 400px;
    height: 1px;
    background-color: var(--aged-brass);
    margin: 0 auto 32px;
}

.colophon-text {
    font-family: var(--font-display);
    font-weight: 400;
    font-size: 1.125rem;
    color: var(--deep-walnut);
    letter-spacing: 0.05em;
    margin-bottom: 8px;
}

.colophon-sub {
    font-family: var(--font-mono);
    font-weight: 300;
    font-size: 0.75rem;
    color: var(--slate-dusk);
    letter-spacing: 0.02em;
}

/* --- Link Styles --- */
a {
    color: var(--dusty-rose);
    text-decoration: underline;
    text-decoration-color: var(--dusty-rose);
    text-underline-offset: 3px;
    transition: color var(--transition-quick), text-decoration-color var(--transition-quick);
}

a:hover {
    color: var(--deep-walnut);
    text-decoration-color: var(--deep-walnut);
}

/* --- Photo Treatment (sepia overlay per DESIGN.md) --- */
.card img {
    filter: saturate(0.6);
    border: 1px solid var(--aged-brass);
    max-width: 280px;
    display: block;
    margin: 12px 0;
    position: relative;
}

.card .photo-wrap {
    position: relative;
    display: inline-block;
}

.card .photo-wrap::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: #D4C4A8;
    opacity: 0.15;
    pointer-events: none;
}

/* --- SVG Grain Texture Filter --- */
.grain-filter {
    /* feTurbulence noise grain: #D4C4A8 sepia tone at 0.03 frequency */
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='g'%3E%3CfeTurbulence baseFrequency='0.03' numOctaves='2' type='fractalNoise'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23g)' opacity='0.03'/%3E%3C/svg%3E");
}

/* --- Desktop Marginalia Visibility (>1200px) --- */
@media (min-width: 1201px) {
    .marginalia-glyphs,
    .handwritten-notes {
        display: block;
    }
}

/* --- Tablet Layout --- */
@media (max-width: 1024px) {
    .card-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }

    .full-card {
        grid-column: span 2;
    }

    .half-card {
        grid-column: span 1;
    }

    .chapter {
        padding: 60px 6% 30px;
    }

    #frontispiece {
        padding: 40px 6%;
    }
}

/* --- Mobile Layout --- */
@media (max-width: 640px) {
    .card-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .full-card,
    .half-card {
        grid-column: span 1;
    }

    .chapter {
        padding: 48px 5% 24px;
    }

    #frontispiece {
        padding: 32px 5%;
    }

    .site-title {
        letter-spacing: 0.04em;
    }

    #bookmark-ribbon {
        left: 12px;
        width: 4px;
    }

    #nav-trigger {
        top: 20px;
        right: 20px;
    }

    #index-panel {
        width: 280px;
        right: -300px;
        padding: 36px 24px;
    }

    .page-number {
        right: 2%;
    }

    .chapter-heading {
        gap: 10px;
    }

    .chapter-heading.visible .chapter-rule {
        width: 40px;
    }
}