/* CSS Custom Properties */
/* Compliance note: IntersectionObserver for fade-reveals:** fade-reveals:* fade-reveals* fade-reveals fade-reveals: fade-revealss** fade-reveals**** One observer instance watches all `.obs-section` elements. When a section crosses 50% visibility IntersectionObserver` with `threshold: 0.5` Lora" (Google Fonts */
:root {
    --bg-parchment: #f4f0e8;
    --text-walnut: #3b3225;
    --text-umber: #4a3f35;
    --accent-sage: #5e6b52;
    --accent-peony: #a8707a;
    --ground-loam: #2c2620;
    --highlight-gold: #c4a55a;
    --mist-blue: #8b9aa3;
    --muted-olive: #7a8b6e;
    --frame-inset: 24px;
    --bracket-size: 20px;
    --content-max: 420px;
    --fade-speed: 1.2s;
    --fade-curve: cubic-bezier(0.25, 0.1, 0.25, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Lora', serif;
    background-color: var(--bg-parchment);
    color: var(--text-umber);
    line-height: 1.72;
    letter-spacing: 0.01em;
    font-size: clamp(1rem, 1.4vw, 1.15rem);
    overflow-x: hidden;
}

body[data-active-season="winter"] {
    background-color: #eae8e2;
}

/* Typography */
.site-title {
    font-family: 'Caveat', cursive;
    font-weight: 700;
    font-size: clamp(2.4rem, 5vw, 4.2rem);
    line-height: 1.15;
    color: var(--text-walnut);
    letter-spacing: -0.02em;
}

.annotation-text,
.obs-label,
.obs-label-inline,
.coordinate-display,
.legend-label {
    font-family: 'Architect\'s Daughter', cursive;
    font-weight: 400;
    font-size: clamp(0.85rem, 1.8vw, 1.1rem);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--accent-sage);
}

.coordinate-display {
    font-family: 'Inconsolata', monospace;
    font-weight: 400;
    font-size: 0.75rem;
    letter-spacing: 0.12em;
    color: var(--muted-olive);
    text-transform: none;
}

/* HUD Frame Container */
.hud-frame {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 2;
}

/* Observation Frame Border */
.hud-frame::before {
    content: '';
    position: fixed;
    top: var(--frame-inset);
    left: var(--frame-inset);
    right: var(--frame-inset);
    bottom: var(--frame-inset);
    border: 1px solid rgba(94, 107, 82, 0.4);
    z-index: 2;
    pointer-events: none;
}

/* Corner Brackets */
.corner-bracket {
    position: fixed;
    width: var(--bracket-size);
    height: var(--bracket-size);
    z-index: 3;
    pointer-events: none;
    opacity: 0.62;
    animation: scope-breath 6s ease-in-out infinite;
}

@keyframes scope-breath {
    0%, 100% { opacity: 0.4; }
    50% { opacity: 1; }
}

.corner-bracket::before,
.corner-bracket::after {
    content: '';
    position: absolute;
    background-color: var(--accent-sage);
}

/* Top-left bracket */
.corner-bracket.top-left {
    top: var(--frame-inset);
    left: var(--frame-inset);
}

.corner-bracket.top-left::before {
    width: 2px;
    height: var(--bracket-size);
    left: 0;
    top: 0;
}

.corner-bracket.top-left::after {
    width: var(--bracket-size);
    height: 2px;
    left: 0;
    top: 0;
}

/* Top-right bracket */
.corner-bracket.top-right {
    top: var(--frame-inset);
    right: var(--frame-inset);
}

.corner-bracket.top-right::before {
    width: 2px;
    height: var(--bracket-size);
    right: 0;
    top: 0;
}

.corner-bracket.top-right::after {
    width: var(--bracket-size);
    height: 2px;
    right: 0;
    top: 0;
}

/* Bottom-left bracket */
.corner-bracket.bottom-left {
    bottom: var(--frame-inset);
    left: var(--frame-inset);
}

.corner-bracket.bottom-left::before {
    width: 2px;
    height: var(--bracket-size);
    left: 0;
    bottom: 0;
}

.corner-bracket.bottom-left::after {
    width: var(--bracket-size);
    height: 2px;
    left: 0;
    bottom: 0;
}

/* Bottom-right bracket */
.corner-bracket.bottom-right {
    bottom: var(--frame-inset);
    right: var(--frame-inset);
}

.corner-bracket.bottom-right::before {
    width: 2px;
    height: var(--bracket-size);
    right: 0;
    bottom: 0;
}

.corner-bracket.bottom-right::after {
    width: var(--bracket-size);
    height: 2px;
    right: 0;
    bottom: 0;
}

/* Bracket animation on scroll/hover */
.corner-bracket::before,
.corner-bracket::after {
    transition: all 400ms ease-out;
}

body.scrolling .corner-bracket.top-left::before,
body.scrolling .corner-bracket.top-left::after {
    transform: translateX(-8px) translateY(-8px);
}

body.scrolling .corner-bracket.top-right::before,
body.scrolling .corner-bracket.top-right::after {
    transform: translateX(8px) translateY(-8px);
}

body.scrolling .corner-bracket.bottom-left::before,
body.scrolling .corner-bracket.bottom-left::after {
    transform: translateX(-8px) translateY(8px);
}

body.scrolling .corner-bracket.bottom-right::before,
body.scrolling .corner-bracket.bottom-right::after {
    transform: translateX(8px) translateY(8px);
}

/* Title Zone */
.title-zone {
    position: fixed;
    top: calc(var(--frame-inset) + 20px);
    left: calc(var(--frame-inset) + 20px);
    z-index: 3;
    pointer-events: none;
    max-width: 200px;
}

.annotation-label {
    position: relative;
    margin-top: 12px;
}

.annotation-line {
    position: absolute;
    top: -12px;
    left: 0;
    width: 40px;
    height: 40px;
    border: 1px solid var(--accent-sage);
    border-top: none;
    border-left: none;
    opacity: 0.5;
}

.annotation-text {
    font-size: clamp(0.75rem, 1.5vw, 0.95rem);
    margin-left: 50px;
    margin-top: -5px;
}

/* Coordinates Zone */
.coordinates-zone {
    position: fixed;
    top: calc(var(--frame-inset) + 20px);
    right: calc(var(--frame-inset) + 20px);
    z-index: 3;
    pointer-events: none;
}

.coordinate-display {
    display: flex;
    align-items: center;
    gap: 6px;
    white-space: nowrap;
}

.separator {
    color: var(--mist-blue);
    opacity: 0.6;
}

/* Legend Zone */
.legend-zone {
    position: fixed;
    bottom: calc(var(--frame-inset) + 20px);
    left: calc(var(--frame-inset) + 20px);
    z-index: 3;
    pointer-events: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.8rem;
}

.legend-icon {
    font-size: 0.9rem;
    color: var(--accent-sage);
}

.legend-icon.observation-icon {
    color: var(--accent-peony);
}

.legend-icon.time-icon {
    color: var(--highlight-gold);
}

/* Observations Zone */
.observations-zone {
    position: fixed;
    bottom: calc(var(--frame-inset) + 20px);
    right: calc(var(--frame-inset) + 20px);
    z-index: 3;
    pointer-events: none;
    max-width: 300px;
}

.obs-header {
    display: flex;
    align-items: center;
    gap: 8px;
}

.hud-note {
    max-width: 300px;
    margin-top: 8px;
    font-family: 'Architect\'s Daughter', cursive;
    font-size: clamp(0.75rem, 1.4vw, 0.9rem);
    line-height: 1.45;
    letter-spacing: 0.06em;
    color: var(--accent-sage);
    opacity: 0.72;
}

.obs-bracket {
    font-size: 1.5rem;
    color: var(--accent-sage);
    font-weight: bold;
}

/* Main Observation Track */
.observation-track {
    position: relative;
    height: 500vh;
    width: 100%;
    z-index: 1;
}

/* Scene Layer - SVG Meadows */
.scene-layer {
    position: sticky;
    top: 0;
    width: 100%;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    z-index: 0;
}

.observations-layer {
    position: relative;
    z-index: 1;
    margin-top: -100vh;
}

.meadow-scene {
    position: absolute;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity var(--fade-speed) var(--fade-curve);
    pointer-events: none;
}

body[data-active-season="spring"] .meadow-spring {
    opacity: 1;
}

body[data-active-season="summer"] .meadow-summer {
    opacity: 1;
}

body[data-active-season="autumn"] .meadow-autumn {
    opacity: 1;
}

body[data-active-season="winter"] .meadow-winter {
    opacity: 1;
}

body[data-active-season="return"] .meadow-return {
    opacity: 1;
}

/* Observation Sections */
.obs-section {
    position: relative;
    height: 100vh;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 40px;
    z-index: 1;
}

.obs-content {
    max-width: var(--content-max);
    position: absolute;
    bottom: 100px;
    right: calc(var(--frame-inset) + 20px);
}

.obs-paragraph {
    font-size: clamp(1rem, 1.4vw, 1.15rem);
    line-height: 1.72;
    color: var(--text-umber);
    opacity: 0;
    transition: opacity var(--fade-speed) var(--fade-curve);
}

.obs-section.visible .obs-paragraph {
    opacity: 1;
}

.obs-marker {
    color: var(--accent-peony);
    font-size: 1.4em;
    margin-right: 6px;
}

.obs-label-inline {
    font-family: 'Architect\'s Daughter', cursive;
    color: var(--accent-sage);
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-right: 8px;
}

/* Chevron Progression */
.obs-section::after {
    content: '∨ ∨';
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.8rem;
    color: var(--accent-sage);
    opacity: 0.3;
    animation: pulse-chevron 3s ease-in-out infinite;
    letter-spacing: 4px;
}

@keyframes pulse-chevron {
    0% { opacity: 0.3; }
    50% { opacity: 0.8; }
    100% { opacity: 0.3; }
}

/* Footer */
.field-log-end {
    position: relative;
    z-index: 1;
    background-color: var(--ground-loam);
    color: var(--highlight-gold);
    padding: 40px;
    text-align: center;
    font-family: 'Inconsolata', monospace;
    font-size: 0.8rem;
    letter-spacing: 0.08em;
}

.footer-text {
    margin: 0;
}

/* Section dividers using slashes */
.obs-section::before {
    content: '// // //';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.7rem;
    color: var(--accent-sage);
    opacity: 0.3;
    letter-spacing: 6px;
    font-family: 'Inconsolata', monospace;
}

/* Responsive Design */
@media (max-width: 768px) {
    :root {
        --frame-inset: 16px;
        --bracket-size: 16px;
    }

    .observation-track {
        height: 600vh;
    }

    .obs-content {
        bottom: 80px;
        right: calc(var(--frame-inset) + 10px);
        max-width: 90%;
    }

    .title-zone {
        top: calc(var(--frame-inset) + 12px);
        left: calc(var(--frame-inset) + 12px);
        max-width: 150px;
    }

    .coordinates-zone {
        top: calc(var(--frame-inset) + 12px);
        right: calc(var(--frame-inset) + 12px);
    }

    .legend-zone {
        bottom: calc(var(--frame-inset) + 12px);
        left: calc(var(--frame-inset) + 12px);
        gap: 6px;
    }

    .legend-item {
        gap: 6px;
        font-size: 0.7rem;
    }

    .observations-zone {
        bottom: calc(var(--frame-inset) + 12px);
        right: calc(var(--frame-inset) + 12px);
        max-width: 250px;
    }
}

/* Hover states for interactive elements */
.corner-bracket:hover::before,
.corner-bracket:hover::after {
    background-color: var(--accent-peony);
    transition: all 300ms ease-out;
}

/* Print styles */
@media print {
    .hud-frame,
    .corner-bracket {
        display: none;
    }

    .observation-track {
        height: auto;
    }

    .scene-layer {
        position: static;
        height: auto;
        margin: 40px 0;
    }

    .meadow-scene {
        opacity: 1 !important;
        position: static;
    }

    .obs-section {
        page-break-inside: avoid;
        height: auto;
        padding: 40px;
    }
}