/* ============================================================
   algoha.com — Stylesheet
   Dark academia / Victorian botanist's cabinet
   ============================================================ */

:root {
    --bg-primary: #1E0A14;
    --bg-secondary: #4A0A2A;
    --bg-tertiary: #3D1A2A;
    --text-primary: #E8D5B7;
    --text-secondary: #A89070;
    --accent-gold: #C4956A;
    --botanical-green: #4A6741;
    --foxed-paper: #8B6F4E;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: 'Cormorant Infant', 'Georgia', 'Times New Roman', serif;
    font-weight: 400;
    line-height: 1.75;
    overflow-x: hidden;
    position: relative;
}

/* Grain noise overlay */
body::after {
    content: '';
    position: fixed;
    inset: 0;
    opacity: 0.04;
    mix-blend-mode: overlay;
    pointer-events: none;
    z-index: 9999;
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='200' height='200'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3' stitchTiles='stitch'/></filter><rect width='200' height='200' filter='url(%23n)' opacity='0.6'/></svg>");
}

/* ============================================================
   Progress Indicator
   ============================================================ */
.progress-track {
    position: fixed;
    top: 0;
    right: 14px;
    width: 2px;
    height: 100vh;
    background-color: var(--bg-tertiary);
    z-index: 100;
}

.progress-fill {
    position: absolute;
    top: 0;
    left: 0;
    width: 2px;
    height: 0;
    background-color: var(--accent-gold);
    transition: height 80ms linear;
}

.progress-tick {
    position: absolute;
    left: -3px;
    width: 8px;
    height: 1px;
    background-color: var(--accent-gold);
    opacity: 0.6;
}

.progress-tick[data-folio="1"] { top: 0; }
.progress-tick[data-folio="2"] { top: 20%; }
.progress-tick[data-folio="3"] { top: 40%; }
.progress-tick[data-folio="4"] { top: 60%; }
.progress-tick[data-folio="5"] { top: 80%; }

/* ============================================================
   Folio base
   ============================================================ */
.folio {
    min-height: 100vh;
    width: 100%;
    position: relative;
    padding: 4rem 6vw;
    display: flex;
    overflow: hidden;
}

.gutter {
    height: 50vh;
    width: 100%;
    background-color: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
}

.gutter-specimen {
    width: 120px;
    height: 120px;
    opacity: 0;
    transition: opacity 500ms ease-in-out;
}

.gutter-specimen.visible {
    opacity: 0.6;
}

/* ============================================================
   FOLIO I — The Cover
   ============================================================ */
.folio-cover {
    background-color: var(--bg-secondary);
    align-items: center;
    justify-content: flex-start;
    padding-left: 8vw;
    position: relative;
}

.cover-title {
    font-family: 'EB Garamond', 'Georgia', serif;
    font-weight: 700;
    font-size: clamp(3.5rem, 8vw, 7rem);
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-primary);
    line-height: 1;
    position: relative;
    z-index: 2;
    margin-top: -4rem;
}

.cover-title::after {
    content: 'A Botanist\'s Cabinet';
    display: block;
    font-family: 'Alegreya SC', 'Georgia', serif;
    font-weight: 400;
    font-size: clamp(0.7rem, 1vw, 0.9rem);
    letter-spacing: 0.4em;
    text-transform: uppercase;
    color: var(--accent-gold);
    margin-top: 1.5rem;
    padding-left: 0.5rem;
}

.fern-illustration {
    position: absolute;
    bottom: 0;
    right: 0;
    width: 50vw;
    max-width: 600px;
    height: auto;
    opacity: 0.85;
    z-index: 1;
}

.fern-path {
    stroke-dasharray: 300;
    stroke-dashoffset: 300;
    transition: stroke-dashoffset 2.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.fern-illustration.activated .fern-path {
    stroke-dashoffset: 0;
}

/* ============================================================
   FOLIO II — Specimen Page
   ============================================================ */
.folio-specimen {
    background-color: var(--bg-primary);
    align-items: center;
}

.specimen-columns {
    display: flex;
    flex-direction: row;
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    gap: 2.5rem;
    align-items: stretch;
}

.specimen-illustration {
    flex: 0 0 62%;
    opacity: 0;
    transform: translateX(-40px);
    transition: opacity 800ms cubic-bezier(0.16, 1, 0.3, 1),
                transform 800ms cubic-bezier(0.16, 1, 0.3, 1);
    display: flex;
    align-items: center;
    justify-content: center;
}

.seed-pod-svg {
    width: 100%;
    max-width: 560px;
    height: auto;
}

.svg-label {
    font-family: 'Alegreya SC', 'Georgia', serif;
    font-size: 12px;
    fill: var(--text-secondary);
    letter-spacing: 0.15em;
    text-transform: uppercase;
}

.specimen-divider {
    width: 1px;
    background-color: var(--foxed-paper);
    opacity: 0.5;
    flex: 0 0 1px;
}

.specimen-text {
    flex: 0 0 calc(38% - 2.5rem - 1px);
    opacity: 0;
    transform: translateX(40px);
    transition: opacity 800ms cubic-bezier(0.16, 1, 0.3, 1),
                transform 800ms cubic-bezier(0.16, 1, 0.3, 1);
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 2rem 0;
}

.folio-specimen.activated .specimen-illustration,
.folio-specimen.activated .specimen-text {
    opacity: 1;
    transform: translateX(0);
}

.specimen-text h2 {
    font-family: 'EB Garamond', 'Georgia', serif;
    font-weight: 500;
    font-size: clamp(1.8rem, 3vw, 2.8rem);
    letter-spacing: 0.06em;
    color: var(--text-primary);
    margin-bottom: 1.8rem;
    line-height: 1.15;
}

.field-note {
    font-family: 'Cormorant Infant', 'Georgia', serif;
    font-style: italic;
    font-size: clamp(1rem, 1.3vw, 1.2rem);
    line-height: 1.75;
    color: var(--text-primary);
    margin-bottom: 1.4rem;
}

.field-note em {
    color: var(--accent-gold);
    font-style: italic;
}

/* ============================================================
   FOLIO III — Taxonomy
   ============================================================ */
.folio-taxonomy {
    background-color: var(--bg-primary);
    align-items: center;
    justify-content: center;
    flex-direction: column;
}

.taxonomy-content {
    max-width: 640px;
    width: 100%;
    margin: 0 auto;
    padding: 2rem 0;
}

.taxonomy-content h2 {
    font-family: 'EB Garamond', 'Georgia', serif;
    font-weight: 500;
    font-size: clamp(1.8rem, 3vw, 2.8rem);
    letter-spacing: 0.06em;
    text-align: center;
    color: var(--text-primary);
    margin-bottom: 2rem;
}

.ornamental-rule {
    margin: 2rem auto;
    width: 200px;
    display: flex;
    justify-content: center;
}

.ornamental-rule svg {
    width: 100%;
    height: 10px;
    display: block;
}

.taxonomy-entry {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 600ms cubic-bezier(0.16, 1, 0.3, 1),
                transform 600ms cubic-bezier(0.16, 1, 0.3, 1);
}

.taxonomy-entry.visible {
    opacity: 1;
    transform: translateY(0);
}

.taxonomy-rank {
    font-family: 'Cormorant Infant', 'Georgia', serif;
    font-size: clamp(1rem, 1.3vw, 1.15rem);
    line-height: 1.85;
    color: var(--text-primary);
    margin: 0.3rem 0;
}

.taxonomy-rank em {
    font-style: italic;
    color: var(--accent-gold);
}

.rank-label {
    font-family: 'Alegreya SC', 'Georgia', serif;
    font-size: 0.75rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--accent-gold);
    margin-right: 0.7rem;
    display: inline-block;
    min-width: 5rem;
}

.indent-1 { padding-left: 1.5rem; }
.indent-2 { padding-left: 3rem; }
.indent-3 { padding-left: 4.5rem; }
.indent-4 { padding-left: 6rem; }
.indent-5 { padding-left: 7.5rem; }
.indent-6 { padding-left: 9rem; }

.taxonomy-note {
    font-family: 'Cormorant Infant', 'Georgia', serif;
    font-size: clamp(1rem, 1.3vw, 1.15rem);
    line-height: 1.8;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    text-align: justify;
}

.taxonomy-note em {
    font-style: italic;
    color: var(--accent-gold);
}

/* ============================================================
   FOLIO IV — Diagram
   ============================================================ */
.folio-diagram {
    background-color: var(--bg-primary);
    align-items: center;
    justify-content: center;
    position: relative;
    padding: 2rem 4vw;
}

.root-diagram {
    width: 100%;
    max-width: 800px;
    height: auto;
    max-height: 90vh;
}

.diagram-part {
    opacity: 0.15;
    transition: opacity 400ms ease, stroke 400ms ease;
}

.diagram-part path,
.diagram-part line {
    transition: stroke 400ms ease;
}

.diagram-part.illuminated {
    opacity: 1;
}

.diagram-label {
    font-family: 'Alegreya SC', 'Georgia', serif;
    font-size: 11px;
    fill: var(--text-secondary);
    letter-spacing: 0.18em;
    text-transform: uppercase;
    opacity: 0;
    transition: opacity 500ms ease;
}

.diagram-part.illuminated .diagram-label {
    opacity: 1;
    fill: var(--accent-gold);
}

/* ============================================================
   FOLIO V — Colophon
   ============================================================ */
.folio-colophon {
    background-color: var(--bg-tertiary);
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 6rem 8vw;
}

.colophon-content {
    max-width: 580px;
    width: 100%;
    margin: 0 auto;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 1200ms cubic-bezier(0.16, 1, 0.3, 1),
                transform 1200ms cubic-bezier(0.16, 1, 0.3, 1);
}

.folio-colophon.activated .colophon-content {
    opacity: 1;
    transform: translateY(0);
}

.colophon-text {
    font-family: 'EB Garamond', 'Georgia', serif;
    font-weight: 500;
    font-size: clamp(1.05rem, 1.4vw, 1.3rem);
    line-height: 1.85;
    color: var(--text-primary);
    margin-bottom: 3rem;
    font-style: italic;
}

.colophon-ornament {
    width: 80px;
    height: 40px;
    display: block;
    margin: 0 auto 2rem auto;
}

.colophon-domain {
    font-family: 'Alegreya SC', 'Georgia', serif;
    font-size: 0.85rem;
    letter-spacing: 0.35em;
    text-transform: uppercase;
    color: var(--accent-gold);
}

/* ============================================================
   Responsive adjustments
   ============================================================ */
@media (max-width: 900px) {
    .specimen-columns {
        flex-direction: column;
        gap: 2rem;
    }
    .specimen-illustration,
    .specimen-text {
        flex: 0 0 100%;
    }
    .specimen-divider {
        width: 80%;
        height: 1px;
        margin: 0 auto;
    }
    .indent-1 { padding-left: 1rem; }
    .indent-2 { padding-left: 2rem; }
    .indent-3 { padding-left: 3rem; }
    .indent-4 { padding-left: 4rem; }
    .indent-5 { padding-left: 5rem; }
    .indent-6 { padding-left: 6rem; }
    .rank-label {
        min-width: 4rem;
        font-size: 0.7rem;
    }
    .fern-illustration {
        width: 70vw;
    }
    .folio {
        padding: 3rem 5vw;
    }
}

@media (max-width: 600px) {
    .cover-title {
        font-size: clamp(2.5rem, 12vw, 4rem);
    }
    .rank-label {
        display: block;
        min-width: auto;
        margin-bottom: 0.2rem;
    }
}