/* ============================================
   footprint.bar — Styles
   Geological Strata Narrative
   ============================================ */

/* CSS Custom Properties */
:root {
    /* Color Palette */
    --deep-humus: #0D1F0D;
    --forest-floor: #1B2F1B;
    --root-brown: #3D2B1A;
    --canopy-shadow: #2A4A2A;
    --moss-gray: #8A9E7A;
    --fog-pale: #D4DCC4;
    --lichen-gold: #C4A44A;
    --spore-white: #F0EDE4;
    --erosion-copper: #9A6B3A;
    --fern-bright: #4A8A3A;
    --trail-green: #4A7A3A;
    --impression-green: #4A7A4A;

    /* Section backgrounds (updated by JS scroll) */
    --soil-bg: #0D1F0D;
    --canopy-opacity: 0.08;

    /* Typography */
    --font-display: 'Libre Baskerville', Georgia, serif;
    --font-body: 'Source Sans 3', 'Source Sans Pro', sans-serif;
    --font-caption: 'Courier Prime', 'Courier New', monospace;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--soil-bg);
    color: var(--fog-pale);
    font-family: var(--font-body);
    font-weight: 400;
    font-size: clamp(0.9375rem, 1.5vw, 1.0625rem);
    line-height: 1.7;
    letter-spacing: 0.01em;
    overflow-x: hidden;
    -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;
    transition: opacity 800ms ease;
}

#grain-overlay.visible {
    opacity: 0.04;
}

#grain-overlay svg {
    width: 100%;
    height: 100%;
}

/* ============================================
   Canopy Light Overlay
   ============================================ */
#canopy-light {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 30vh;
    pointer-events: none;
    z-index: 9998;
    background: linear-gradient(180deg, rgba(45, 90, 45, var(--canopy-opacity)) 0%, transparent 100%);
    transition: opacity 0.5s ease;
}

/* ============================================
   Opening Sequence
   ============================================ */
.section-opening {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background-color: var(--deep-humus);
}

.opening-content {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

/* Carbon Print Hero SVG */
.carbon-print-hero {
    opacity: 0.3;
    width: clamp(180px, 30vw, 300px);
    height: clamp(180px, 30vw, 300px);
}

.carbon-print-hero .ring {
    stroke-dasharray: 1000;
    stroke-dashoffset: 1000;
}

.carbon-print-hero.animate .ring-1 {
    animation: drawRing 2.5s ease-out 0.6s forwards;
}
.carbon-print-hero.animate .ring-2 {
    animation: drawRing 2.2s ease-out 0.9s forwards;
}
.carbon-print-hero.animate .ring-3 {
    animation: drawRing 1.9s ease-out 1.1s forwards;
}
.carbon-print-hero.animate .ring-4 {
    animation: drawRing 1.6s ease-out 1.3s forwards;
}
.carbon-print-hero.animate .ring-5 {
    animation: drawRing 1.3s ease-out 1.5s forwards;
}
.carbon-print-hero.animate .ring-6 {
    animation: drawRing 1.0s ease-out 1.7s forwards;
}
.carbon-print-hero.animate .ring-7 {
    animation: drawRing 0.8s ease-out 1.9s forwards;
}

@keyframes drawRing {
    to {
        stroke-dashoffset: 0;
    }
}

/* Domain Title */
#domain-title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(1.75rem, 4vw, 3.5rem);
    color: var(--lichen-gold);
    letter-spacing: 0.06em;
    line-height: 1.15;
    opacity: 0;
    transition: opacity 1.2s ease;
}

#domain-title.visible {
    opacity: 1;
}

/* Opening Tagline */
#opening-tagline {
    font-family: var(--font-body);
    font-weight: 300;
    font-size: clamp(0.9375rem, 1.5vw, 1.125rem);
    color: var(--fog-pale);
    line-height: 1.7;
    letter-spacing: 0.01em;
    max-width: 480px;
    opacity: 0;
    transition: opacity 1s ease;
}

#opening-tagline.visible {
    opacity: 1;
}

/* ============================================
   Strata Sections
   ============================================ */
.strata-section {
    position: relative;
    padding: clamp(3rem, 6vw, 6rem) clamp(1rem, 4vw, 4rem);
    transition: background-color 0.8s ease;
}

#surface {
    background-color: var(--forest-floor);
}

#roots {
    background: linear-gradient(180deg, #1A2414 0%, #231A10 100%);
}

#bedrock {
    background-color: #0A1508;
}

#canopy {
    background: linear-gradient(180deg, #1B2F1B 0%, #2A4A2A 100%);
}

/* Section Headings */
.section-heading-wrap {
    text-align: center;
    margin-bottom: clamp(2rem, 4vw, 4rem);
    position: relative;
    z-index: 2;
}

.section-caption {
    font-family: var(--font-caption);
    font-weight: 400;
    font-size: 0.75rem;
    color: var(--moss-gray);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    display: block;
    margin-bottom: 0.75rem;
}

.section-heading {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(1.75rem, 4vw, 3.5rem);
    color: var(--lichen-gold);
    letter-spacing: 0.03em;
    line-height: 1.15;
}

.bedrock-heading {
    font-style: italic;
    color: var(--spore-white);
}

.canopy-heading {
    color: var(--lichen-gold);
}

/* ============================================
   Masonry Container
   ============================================ */
.masonry-container {
    columns: 2;
    column-gap: clamp(1rem, 2vw, 2rem);
    max-width: 1100px;
    margin: 0 auto;
    position: relative;
    z-index: 2;
}

/* ============================================
   Fossil Panels
   ============================================ */
.fossil-panel {
    break-inside: avoid;
    background-color: var(--forest-floor);
    border: 1px solid var(--canopy-shadow);
    border-radius: 3px;
    padding: clamp(1.25rem, 2.5vw, 2rem);
    margin-bottom: clamp(1rem, 2vw, 1.5rem);
    position: relative;
    overflow: hidden;
    transition: transform 0.15s ease-out, box-shadow 0.15s ease-out;
    transform: perspective(800px) rotateX(0deg) rotateY(0deg);
    /* Inline SVG noise texture for paper feel */
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='200' height='200' filter='url(%23n)' opacity='0.03'/%3E%3C/svg%3E");
}

.fossil-panel:hover {
    z-index: 5;
}

/* Panel variations */
.panel-tall {
    min-height: 320px;
}

.panel-wide {
    padding: clamp(1.5rem, 3vw, 2.5rem);
}

/* Root section panels */
.panel-root {
    background-color: #1A1A12;
    border-color: var(--root-brown);
}

/* Bedrock section panels */
.panel-bedrock {
    background-color: #0D120D;
    border-color: #1A2A1A;
}

/* Canopy section panels */
.panel-canopy {
    background-color: #1B2F1B;
    border-color: var(--canopy-shadow);
}

/* Panel content */
.panel-caption {
    font-family: var(--font-caption);
    font-weight: 400;
    font-size: 0.75rem;
    color: var(--moss-gray);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    display: block;
    margin-bottom: 1rem;
}

.panel-text {
    font-family: var(--font-body);
    font-weight: 400;
    font-size: clamp(0.9375rem, 1.5vw, 1.0625rem);
    color: var(--fog-pale);
    line-height: 1.7;
    letter-spacing: 0.01em;
    margin-bottom: 1rem;
}

.panel-text:last-child {
    margin-bottom: 0;
}

/* ============================================
   Panel Animation (Entrance)
   ============================================ */
.panel-animate {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 600ms cubic-bezier(0.25, 0.46, 0.45, 0.94),
                transform 600ms cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.panel-animate.in-view {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger columns */
.panel-animate[data-col="right"] {
    transition-delay: 100ms;
}

/* ============================================
   SVG Overlays — Leaf Impressions
   ============================================ */
.leaf-impression {
    position: absolute;
    top: 10%;
    right: -10%;
    width: 60%;
    height: auto;
    pointer-events: none;
    z-index: 0;
    transform: rotate(-3deg);
    transition: transform 0.3s ease;
}

.fern-impression {
    top: 5%;
    right: auto;
    left: -5%;
    transform: rotate(5deg);
}

/* Carbon Print Background */
.carbon-print-bg {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    pointer-events: none;
    z-index: 0;
}

.carbon-print-large {
    width: 80%;
    height: auto;
}

.carbon-print-massive {
    width: 100%;
    height: auto;
    opacity: 0.6;
}

/* Panel text above overlays */
.fossil-panel .panel-caption,
.fossil-panel .panel-text {
    position: relative;
    z-index: 1;
}

/* ============================================
   Trail Marks
   ============================================ */
.trail-marks {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
}

.trail-line {
    stroke-dasharray: 4 12;
    stroke: #4A7A3A;
}

/* Stratum 2 impression overlays */
.strata-section .leaf-impression path,
.strata-section .leaf-impression line {
    stroke: #4A7A4A;
}

/* ============================================
   Erosion Separators
   ============================================ */
.erosion-separator {
    padding: 1rem 0;
    position: relative;
    overflow: hidden;
}

.erosion-pattern {
    width: 100%;
    height: 60px;
    display: block;
}

.erosion-wide .erosion-pattern {
    height: 80px;
}

/* ============================================
   Final Statement
   ============================================ */
.final-statement {
    max-width: 700px;
    margin: clamp(4rem, 8vw, 8rem) auto 0;
    text-align: center;
    padding: clamp(2rem, 4vw, 4rem);
    position: relative;
    z-index: 2;
}

.final-text {
    font-family: var(--font-display);
    font-weight: 400;
    font-size: clamp(1.25rem, 2.5vw, 1.75rem);
    color: var(--fern-bright);
    line-height: 1.5;
    letter-spacing: 0.01em;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 1.2s cubic-bezier(0.25, 0.46, 0.45, 0.94),
                transform 1.2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.final-text.in-view {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================
   Responsive — Single Column
   ============================================ */
@media (max-width: 768px) {
    .masonry-container {
        columns: 1;
    }

    .carbon-print-hero {
        width: 150px;
        height: 150px;
    }

    .strata-section {
        padding: 2rem 1rem;
    }

    .trail-marks {
        display: none;
    }
}

/* ============================================
   Reduced Motion
   ============================================ */
@media (prefers-reduced-motion: reduce) {
    .panel-animate {
        opacity: 1;
        transform: none;
        transition: none;
    }

    .carbon-print-hero .ring {
        stroke-dashoffset: 0;
        animation: none;
    }

    #domain-title,
    #opening-tagline {
        opacity: 1;
        transition: none;
    }

    .final-text {
        opacity: 1;
        transform: none;
        transition: none;
    }
}