/* ============================================================
   continua.club — Victorian Naturalist's Perpetual Journal
   Monochrome · Editorial Flow · Garamond Classic
   ============================================================ */

:root {
    --ink-deep: #1a1a1a;
    --ink-warm: #3d3d3d;
    --ink-pewter: #6b6b6b;
    --ink-silver: #a8a8a8;
    --parchment: #d9d5cc;
    --linen: #f0ece4;
    --bone: #faf8f3;

    --serif-display: 'Cormorant Garamond', 'Garamond', 'Times New Roman', serif;
    --serif-body: 'EB Garamond', 'Garamond', 'Times New Roman', serif;
    --serif-margin: 'Crimson Pro', 'Garamond', 'Times New Roman', serif;

    --spring: cubic-bezier(0.34, 1.56, 0.64, 1);
    --ease-gentle: cubic-bezier(0.22, 1, 0.36, 1);

    --column-width: 640px;
    --page-gutter: clamp(1.25rem, 4vw, 4rem);
}

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

html {
    scroll-behavior: smooth;
}

body {
    background: var(--linen);
    color: var(--ink-deep);
    font-family: var(--serif-body);
    font-size: clamp(1rem, 1.8vw, 1.2rem);
    line-height: 1.75;
    font-weight: 400;
    overflow-x: hidden;
    position: relative;
    min-height: 100vh;
}

/* Paper grain overlay */
.paper-noise {
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
    opacity: 0.03;
    pointer-events: none;
    z-index: 100;
    mix-blend-mode: multiply;
}

/* SVG sprite (hidden) */
.svg-sprite {
    position: absolute;
    width: 0;
    height: 0;
    overflow: hidden;
}

/* =====================================================
   FRONTISPIECE
   ===================================================== */

.frontispiece {
    position: relative;
    min-height: 100vh;
    background: var(--bone);
    padding: var(--page-gutter);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.ornamental-frame {
    position: relative;
    width: min(100%, 900px);
    padding: clamp(2rem, 6vw, 5rem) clamp(1.5rem, 5vw, 4rem);
    background: transparent;
}

/* Four lines that animate from corners inward */
.frame-line {
    position: absolute;
    background: var(--ink-deep);
    transition: width 1.2s var(--ease-gentle), height 1.2s var(--ease-gentle);
}

.frame-top {
    top: 0;
    left: 50%;
    height: 2px;
    width: 0;
    transform: translateX(-50%);
}

.frame-bottom {
    bottom: 0;
    left: 50%;
    height: 2px;
    width: 0;
    transform: translateX(-50%);
}

.frame-left {
    top: 50%;
    left: 0;
    width: 2px;
    height: 0;
    transform: translateY(-50%);
}

.frame-right {
    top: 50%;
    right: 0;
    width: 2px;
    height: 0;
    transform: translateY(-50%);
}

.ornamental-frame.drawn .frame-top,
.ornamental-frame.drawn .frame-bottom {
    width: 100%;
}

.ornamental-frame.drawn .frame-left,
.ornamental-frame.drawn .frame-right {
    height: 100%;
}

/* inner second rule */
.ornamental-frame::before {
    content: '';
    position: absolute;
    inset: 8px;
    border: 1px solid var(--ink-silver);
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.8s ease 1.1s;
}

.ornamental-frame.drawn::before {
    opacity: 1;
}

.frame-corner {
    position: absolute;
    width: 40px;
    height: 40px;
    color: var(--ink-deep);
    opacity: 0;
    transition: opacity 0.6s ease 1.4s;
}

.ornamental-frame.drawn .frame-corner {
    opacity: 1;
}

.frame-corner svg {
    width: 100%;
    height: 100%;
}

.frame-corner-tl { top: -2px; left: -2px; }
.frame-corner-tr { top: -2px; right: -2px; transform: rotate(90deg); }
.frame-corner-bl { bottom: -2px; left: -2px; transform: rotate(-90deg); }
.frame-corner-br { bottom: -2px; right: -2px; transform: rotate(180deg); }

.frontispiece-inner {
    text-align: center;
    position: relative;
    z-index: 2;
}

.frontispiece-eyebrow {
    font-family: var(--serif-margin);
    font-weight: 300;
    font-style: italic;
    font-size: clamp(0.8rem, 1.2vw, 0.95rem);
    color: var(--ink-pewter);
    letter-spacing: 0.25em;
    text-transform: uppercase;
    margin-bottom: clamp(1.5rem, 4vw, 3rem);
    opacity: 0;
    animation: fade-in 1.2s ease 0.2s forwards;
}

.frontispiece-swash {
    color: var(--ink-deep);
    margin: 0 auto;
    width: clamp(120px, 30vw, 220px);
    opacity: 0;
}

.frontispiece-swash svg {
    width: 100%;
    height: auto;
    display: block;
}

.swash-top {
    margin-bottom: clamp(0.5rem, 2vw, 1.5rem);
    animation: fade-in 0.9s ease 0.3s forwards;
}

.swash-bottom {
    margin-top: clamp(0.5rem, 2vw, 1.5rem);
    animation: fade-in 0.9s ease 1.4s forwards;
}

.frontispiece-title {
    font-family: var(--serif-display);
    font-weight: 700;
    font-size: clamp(3rem, 7vw, 7rem);
    line-height: 0.95;
    letter-spacing: 0.06em;
    color: var(--ink-deep);
    text-transform: uppercase;
    display: flex;
    justify-content: center;
    gap: 0.02em;
    flex-wrap: wrap;
}

.frontispiece-title .letter {
    display: inline-block;
    transform: scale(0.5);
    opacity: 0;
    transition: transform 0.6s var(--spring), opacity 0.6s var(--ease-gentle);
}

.frontispiece-title.animated .letter {
    transform: scale(1);
    opacity: 1;
}

.frontispiece-subtitle {
    font-family: var(--serif-display);
    font-weight: 600;
    font-size: clamp(0.9rem, 1.5vw, 1.15rem);
    letter-spacing: 0.35em;
    text-transform: uppercase;
    color: var(--ink-warm);
    margin-top: clamp(0.75rem, 2vw, 1.25rem);
    opacity: 0;
    animation: fade-in 1s ease 1.6s forwards;
}

.frontispiece-latin {
    font-family: var(--serif-margin);
    font-style: italic;
    font-size: clamp(0.9rem, 1.3vw, 1.05rem);
    color: var(--ink-pewter);
    margin-top: clamp(1rem, 3vw, 2rem);
    letter-spacing: 0.04em;
    opacity: 0;
    animation: fade-in 1s ease 1.9s forwards;
}

.frontispiece-leafmark {
    margin: clamp(1.5rem, 4vw, 2.5rem) auto 0;
    width: 32px;
    height: 32px;
    color: var(--ink-warm);
    opacity: 0;
    animation: fade-in 0.9s ease 2.2s forwards;
}

.frontispiece-leafmark svg {
    width: 100%;
    height: 100%;
}

.frontispiece-falling-leaf {
    position: absolute;
    top: -40px;
    left: 50%;
    width: 28px;
    height: 28px;
    color: var(--ink-warm);
    pointer-events: none;
    animation: leaf-fall 8s var(--ease-gentle) 0.5s forwards;
    z-index: 3;
}

.frontispiece-falling-leaf svg {
    width: 100%;
    height: 100%;
}

@keyframes leaf-fall {
    0% {
        transform: translate(-50%, 0) rotate(0deg);
        opacity: 0;
    }
    10% { opacity: 1; }
    100% {
        transform: translate(calc(-50% + 40px), calc(100vh - 140px)) rotate(220deg);
        opacity: 0.9;
    }
}

@keyframes fade-in {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

/* =====================================================
   PLATES (full-width interruptions)
   IntersectionObserver`
   ===================================================== */

.plate {
    position: relative;
    padding: clamp(4rem, 10vw, 8rem) var(--page-gutter);
    background: var(--parchment);
    overflow: hidden;
    border-top: 1px solid var(--ink-silver);
    border-bottom: 1px solid var(--ink-silver);
    background-image:
        repeating-linear-gradient(45deg, transparent 0, transparent 18px, rgba(61, 61, 61, 0.04) 18px, rgba(61, 61, 61, 0.04) 19px),
        repeating-linear-gradient(-45deg, transparent 0, transparent 18px, rgba(61, 61, 61, 0.04) 18px, rgba(61, 61, 61, 0.04) 19px);
}

.plate-alt {
    background: var(--bone);
}

.plate-watermark {
    position: absolute;
    width: clamp(260px, 40vw, 520px);
    height: clamp(260px, 40vw, 520px);
    color: var(--ink-deep);
    opacity: 0;
    pointer-events: none;
    transition: opacity 2s ease;
}

.plate.in-view .plate-watermark {
    opacity: 0.06;
}

.plate-watermark svg {
    width: 100%;
    height: 100%;
    animation: slow-spin 120s linear infinite;
}

.plate-watermark-left {
    top: -6%;
    left: -10%;
}

.plate-watermark-right {
    bottom: -8%;
    right: -10%;
    transform: scaleX(-1);
}

.plate-watermark-center {
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.plate-watermark-center svg {
    animation: slow-spin-reverse 140s linear infinite;
}

@keyframes slow-spin {
    to { transform: rotate(360deg); }
}

@keyframes slow-spin-reverse {
    to { transform: rotate(-360deg); }
}

.plate-inner {
    position: relative;
    z-index: 2;
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
    padding: clamp(2rem, 5vw, 4rem) clamp(1rem, 4vw, 3rem);
    border: 1px solid var(--ink-silver);
    outline: 3px double var(--ink-deep);
    outline-offset: 8px;
    background: rgba(250, 248, 243, 0.55);
}

.plate-number {
    font-family: var(--serif-margin);
    font-weight: 300;
    font-style: italic;
    font-size: clamp(0.8rem, 1.1vw, 0.95rem);
    color: var(--ink-pewter);
    letter-spacing: 0.4em;
    text-transform: uppercase;
    margin-bottom: clamp(0.75rem, 2vw, 1.25rem);
}

.plate-title {
    font-family: var(--serif-display);
    font-weight: 700;
    font-size: clamp(1.8rem, 4vw, 3.5rem);
    line-height: 1.1;
    letter-spacing: 0.06em;
    color: var(--ink-deep);
    font-variant: small-caps;
    text-transform: lowercase;
}

.plate-rule {
    width: clamp(60px, 12vw, 120px);
    height: 1px;
    background: var(--ink-warm);
    margin: clamp(1.25rem, 3vw, 2rem) auto;
    position: relative;
}

.plate-rule::before,
.plate-rule::after {
    content: '';
    position: absolute;
    top: 50%;
    width: 4px;
    height: 4px;
    background: var(--ink-warm);
    border-radius: 50%;
    transform: translateY(-50%);
}

.plate-rule::before { left: -10px; }
.plate-rule::after { right: -10px; }

.plate-caption {
    font-family: var(--serif-margin);
    font-style: italic;
    font-weight: 400;
    font-size: clamp(0.95rem, 1.4vw, 1.1rem);
    color: var(--ink-warm);
    max-width: 540px;
    margin: 0 auto;
    line-height: 1.6;
}

.plate-specimens {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: clamp(1rem, 3vw, 2.5rem);
    margin: clamp(1.5rem, 4vw, 2.5rem) 0;
}

.specimen {
    flex: 0 1 140px;
    text-align: center;
}

.specimen-frame {
    width: 72px;
    height: 72px;
    margin: 0 auto 0.75rem;
    border: 1px solid var(--ink-warm);
    outline: 2px double var(--ink-silver);
    outline-offset: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--ink-deep);
    background: var(--bone);
    transition: transform 0.6s var(--spring);
}

.specimen:hover .specimen-frame {
    transform: translateY(-4px) rotate(-2deg);
}

.specimen-frame svg {
    width: 40px;
    height: 40px;
}

.specimen figcaption {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.specimen-latin {
    font-family: var(--serif-body);
    font-style: italic;
    font-size: 0.95rem;
    color: var(--ink-deep);
}

.specimen-common {
    font-family: var(--serif-margin);
    font-weight: 300;
    font-size: 0.8rem;
    color: var(--ink-pewter);
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

/* Calendar grid inside plate */
.calendar-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 0;
    margin: clamp(1.5rem, 4vw, 2.5rem) 0;
    text-align: left;
    border-top: 1px solid var(--ink-silver);
}

.calendar-entry {
    border-bottom: 1px solid var(--ink-silver);
    padding: 0.75rem 1rem;
    display: grid;
    grid-template-columns: 110px 1fr;
    gap: 0.75rem;
    align-items: baseline;
}

.cal-month {
    font-family: var(--serif-display);
    font-weight: 600;
    font-variant: small-caps;
    text-transform: lowercase;
    letter-spacing: 0.1em;
    color: var(--ink-deep);
    font-size: 1.05rem;
}

.cal-obs {
    font-family: var(--serif-body);
    font-style: italic;
    color: var(--ink-warm);
    font-size: 0.95rem;
    line-height: 1.55;
}

/* =====================================================
   BODY SECTIONS (column + marginalia)
   ===================================================== */

.body-section {
    position: relative;
    padding: clamp(3rem, 8vw, 6rem) var(--page-gutter);
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: minmax(0, 220px) minmax(0, var(--column-width)) minmax(0, 1fr);
    gap: clamp(1rem, 3vw, 3rem);
    align-items: start;
}

.marginalia {
    font-family: var(--serif-margin);
    font-size: clamp(0.75rem, 1.2vw, 0.9rem);
    color: var(--ink-pewter);
    text-align: right;
    position: sticky;
    top: 3rem;
    opacity: 0;
    transform: translateX(-40px);
    transition: transform 0.9s var(--spring), opacity 0.9s var(--ease-gentle);
}

.body-section.in-view .marginalia {
    opacity: 1;
    transform: translateX(0);
}

.margin-date {
    font-weight: 300;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--ink-pewter);
    margin-bottom: 0.75rem;
    font-size: 0.75rem;
}

.margin-leaf {
    width: 28px;
    height: 28px;
    color: var(--ink-warm);
    margin-left: auto;
    margin-bottom: 0.75rem;
}

.margin-leaf svg {
    width: 100%;
    height: 100%;
}

.margin-note {
    font-style: italic;
    font-weight: 400;
    line-height: 1.55;
    color: var(--ink-warm);
    margin-bottom: 0.5rem;
}

.margin-cite {
    font-weight: 300;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    color: var(--ink-pewter);
}

.body-column {
    max-width: var(--column-width);
}

.section-heading {
    font-family: var(--serif-display);
    font-weight: 600;
    font-size: clamp(1.3rem, 2.5vw, 2rem);
    line-height: 1.2;
    letter-spacing: 0.02em;
    font-variant: small-caps;
    text-transform: lowercase;
    color: var(--ink-deep);
    margin-bottom: clamp(1.25rem, 3vw, 2rem);
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--ink-silver);
    display: flex;
    gap: 0.4em;
    flex-wrap: wrap;
}

.section-heading .word {
    display: inline-block;
    transform: translateY(20px);
    opacity: 0;
    transition: transform 0.7s var(--spring), opacity 0.7s var(--ease-gentle);
}

.body-section.in-view .section-heading .word {
    transform: translateY(0);
    opacity: 1;
}

.body-section.in-view .section-heading .word:nth-child(1) { transition-delay: 0.05s; }
.body-section.in-view .section-heading .word:nth-child(2) { transition-delay: 0.11s; }
.body-section.in-view .section-heading .word:nth-child(3) { transition-delay: 0.17s; }
.body-section.in-view .section-heading .word:nth-child(4) { transition-delay: 0.23s; }

.body-column p {
    margin-bottom: 1em;
    color: var(--ink-deep);
}

.body-column p + p {
    text-indent: 1.5em;
    margin-bottom: 1em;
}

.body-column em {
    font-style: italic;
    color: var(--ink-deep);
}

.drop-cap {
    float: left;
    font-family: var(--serif-display);
    font-weight: 700;
    font-size: 4em;
    line-height: 0.8;
    margin: 0.1em 0.15em 0 0;
    padding: 0.1em 0.18em;
    color: var(--ink-deep);
    border: 1px solid var(--ink-warm);
    outline: 2px solid var(--ink-silver);
    outline-offset: 2px;
    background: var(--bone);
}

.lede {
    font-size: 1.05em;
}

.envoi-signature {
    font-family: var(--serif-margin);
    font-style: italic;
    color: var(--ink-pewter);
    text-align: right;
    margin-top: 1.5em;
    letter-spacing: 0.05em;
}

/* =====================================================
   VINE DIVIDER
   ===================================================== */

.vine-divider {
    position: relative;
    width: min(100%, 720px);
    margin: clamp(1rem, 3vw, 2.5rem) auto;
    padding: 0 var(--page-gutter);
    display: flex;
    align-items: center;
    justify-content: center;
}

.vine-rule {
    flex: 1;
    height: 1px;
    background: var(--ink-warm);
    max-width: 280px;
}

.vine-sprig {
    display: inline-flex;
    color: var(--ink-deep);
    width: 80px;
    margin: 0 1rem;
    background: var(--linen);
    padding: 0 0.5rem;
}

.vine-sprig svg {
    width: 100%;
    height: auto;
}

.vine-divider-footer .vine-sprig {
    background: var(--bone);
}

/* =====================================================
   INDEX (Footer)
   ===================================================== */

.index {
    background: var(--bone);
    padding: clamp(4rem, 8vw, 7rem) var(--page-gutter) clamp(3rem, 6vw, 5rem);
    border-top: 1px solid var(--ink-silver);
    position: relative;
}

.index-header {
    max-width: 800px;
    margin: 0 auto clamp(2rem, 5vw, 3.5rem);
    text-align: center;
}

.index-title {
    font-family: var(--serif-display);
    font-weight: 700;
    font-size: clamp(1.5rem, 3vw, 2.25rem);
    letter-spacing: 0.08em;
    font-variant: small-caps;
    text-transform: lowercase;
    color: var(--ink-deep);
    margin-top: 0.5rem;
}

.index-subtitle {
    font-family: var(--serif-margin);
    font-style: italic;
    color: var(--ink-pewter);
    margin-top: 0.75rem;
    font-size: clamp(0.85rem, 1.3vw, 1rem);
    max-width: 540px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.55;
}

.index-columns {
    max-width: 960px;
    margin: 0 auto;
    column-count: 2;
    column-gap: 3rem;
}

@media (max-width: 720px) {
    .index-columns {
        column-count: 1;
    }
}

.index-entry {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    padding: 0.45rem 0;
    text-decoration: none;
    color: var(--ink-deep);
    font-family: var(--serif-body);
    font-size: clamp(0.9rem, 1.3vw, 1.02rem);
    break-inside: avoid;
    transition: color 0.3s ease;
}

.index-entry:hover {
    color: var(--ink-warm);
}

.index-name {
    text-indent: 0;
    padding-left: 1.25em;
    position: relative;
    flex: 0 1 auto;
    max-width: 80%;
}

.index-name::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.55em;
    width: 0.7em;
    height: 1px;
    background: var(--ink-pewter);
}

.index-dots {
    flex: 1;
    border-bottom: 1px dotted var(--ink-pewter);
    margin: 0 0.5em;
    align-self: baseline;
    position: relative;
    top: -0.2em;
    min-width: 1rem;
}

.index-page {
    font-family: var(--serif-margin);
    font-style: italic;
    color: var(--ink-pewter);
    font-size: 0.9em;
    flex-shrink: 0;
}

.colophon {
    margin-top: clamp(3rem, 6vw, 5rem);
    text-align: center;
    font-family: var(--serif-margin);
    font-style: italic;
    font-weight: 300;
    color: var(--ink-pewter);
    font-size: clamp(0.8rem, 1.1vw, 0.92rem);
    line-height: 1.9;
    letter-spacing: 0.05em;
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.colophon-line:last-child {
    font-family: var(--serif-display);
    font-style: normal;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.4em;
    color: var(--ink-warm);
    margin-top: 1rem;
    font-size: 0.85rem;
}

/* =====================================================
   AMBIENT LEAF-FALL
   ===================================================== */

.leaf-fall-container {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 50;
    overflow: hidden;
}

.ambient-leaf {
    position: absolute;
    top: -40px;
    width: 22px;
    height: 22px;
    color: var(--ink-warm);
    opacity: 0.55;
    will-change: transform;
}

.ambient-leaf svg {
    width: 100%;
    height: 100%;
}

/* =====================================================
   RESPONSIVE (Marginalia collapse)
   ===================================================== */

@media (max-width: 900px) {
    .body-section {
        grid-template-columns: 1fr;
        max-width: var(--column-width);
    }
    .marginalia {
        position: static;
        text-align: left;
        border-left: 2px solid var(--ink-silver);
        padding: 0.5rem 0 0.5rem 1em;
        margin-bottom: 1.5rem;
    }
    .marginalia .margin-leaf {
        margin-left: 0;
    }
    .drop-cap {
        font-size: 3.2em;
    }
}

@media (max-width: 560px) {
    .frontispiece-title {
        letter-spacing: 0.04em;
    }
    .plate-inner {
        outline-offset: 5px;
    }
    .plate-specimens {
        gap: 1rem;
    }
    .specimen {
        flex: 0 1 100px;
    }
    .specimen-frame {
        width: 58px;
        height: 58px;
    }
    .specimen-frame svg {
        width: 32px;
        height: 32px;
    }
    .calendar-entry {
        grid-template-columns: 90px 1fr;
    }
}

/* =====================================================
   PRINT-LIKE PRINT STYLES
   ===================================================== */

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
    .frontispiece-falling-leaf {
        display: none;
    }
    .plate-watermark svg {
        animation: none;
    }
}