/* ===== CSS Custom Properties ===== */
:root {
    --midnight-navy: #0a1628;
    --deep-prussian: #142238;
    --parchment-cream: #e8dcc8;
    --candle-amber: #d4a54a;
    --tarnished-silver: #8b9dc3;
    --oxidized-brass: #7a6a3d;
    --lunar-white: #e2e0dc;
    --ink-dark: #1a1a2e;
    --warm-parchment: #f0e6d0;
    --candle-y: 20vh;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--midnight-navy);
    color: var(--lunar-white);
    font-family: 'Source Serif 4', Georgia, serif;
    font-weight: 400;
    font-size: clamp(1rem, 1.2vw, 1.25rem);
    line-height: 1.75;
    overflow-x: hidden;
}

/* ===== Candle Glow Overlay ===== */
#candle-glow {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
    background:
        radial-gradient(ellipse 40vw 40vw at 15vw var(--candle-y), rgba(212, 165, 74, 0.08) 0%, transparent 70%),
        radial-gradient(ellipse 20vw 20vw at 15vw var(--candle-y), rgba(212, 165, 74, 0.05) 0%, transparent 50%);
}

/* ===== Textures ===== */
.paper-texture {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='100' height='100'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100' height='100' filter='url(%23n)' opacity='0.03'/%3E%3C/svg%3E");
}

.crosshatch-texture {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='10'%3E%3Cpath d='M0 0L10 10M10 0L0 10' stroke='%238b9dc3' stroke-width='0.3' opacity='0.08'/%3E%3C/svg%3E");
}

/* ===== Desk Scene ===== */
.desk-scene {
    position: relative;
    width: 100%;
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background-color: var(--midnight-navy);
    z-index: 2;
}

.desk-content {
    text-align: center;
    z-index: 3;
}

.desk-title {
    font-family: 'Playfair Display', Georgia, serif;
    font-weight: 700;
    font-size: clamp(3rem, 7vw, 5.5rem);
    color: var(--lunar-white);
    letter-spacing: 0.02em;
    margin-bottom: 1rem;
}

.desk-subtitle {
    font-family: 'Source Serif 4', Georgia, serif;
    font-style: italic;
    font-size: 1.2rem;
    color: var(--tarnished-silver);
    margin-bottom: 2rem;
}

.desk-divider {
    width: 20vw;
    height: 1px;
    background-color: var(--candle-amber);
    opacity: 0.3;
    margin: 0 auto;
}

.scroll-cue {
    position: absolute;
    bottom: 3rem;
    animation: pulse 3s ease-in-out infinite;
    opacity: 0.5;
    z-index: 3;
}

@keyframes pulse {
    0%, 100% { opacity: 0.3; transform: translateY(0); }
    50% { opacity: 0.7; transform: translateY(8px); }
}

/* ===== Equation Marginalia ===== */
.equation-marginalia {
    position: absolute;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    color: var(--tarnished-silver);
    opacity: 0.15;
    pointer-events: none;
    z-index: 2;
    white-space: nowrap;
}

.eq-m1 {
    top: 15%;
    right: 8%;
    transform: rotate(3deg);
}

.eq-m2 {
    bottom: 25%;
    left: 5%;
    transform: rotate(-2deg);
}

.eq-m3 {
    top: 10%;
    right: 5%;
    transform: rotate(4deg);
}

.eq-m4 {
    bottom: 15%;
    left: 3%;
    transform: rotate(-3deg);
}

/* ===== Notebook Body ===== */
.notebook-body {
    position: relative;
    padding: 4rem 3rem;
    z-index: 2;
}

.masonry-grid {
    column-count: 3;
    column-gap: 2rem;
    max-width: 1400px;
    margin: 0 auto;
}

/* ===== Block Base ===== */
.block {
    break-inside: avoid;
    margin-bottom: 2rem;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
    position: relative;
}

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

/* ===== Prose Block ===== */
.prose-block {
    background-color: var(--parchment-cream);
    color: var(--ink-dark);
    border-left: 3px solid var(--candle-amber);
    padding: 2rem;
    border-radius: 2px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='100' height='100'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100' height='100' filter='url(%23n)' opacity='0.04'/%3E%3C/svg%3E");
}

.prose-block h2 {
    font-family: 'Playfair Display', Georgia, serif;
    font-weight: 700;
    font-size: clamp(1.5rem, 3vw, 2.5rem);
    letter-spacing: 0.02em;
    color: var(--ink-dark);
    margin-bottom: 1rem;
}

.prose-block p {
    margin-bottom: 1rem;
}

.prose-block p:last-child {
    margin-bottom: 0;
}

/* ===== Equation Block ===== */
.equation-block {
    background-color: var(--deep-prussian);
    color: var(--tarnished-silver);
    padding: 1.5rem;
    text-align: center;
    border: 1px solid rgba(139, 157, 195, 0.2);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='10'%3E%3Cpath d='M0 0L10 10M10 0L0 10' stroke='%238b9dc3' stroke-width='0.3' opacity='0.06'/%3E%3C/svg%3E");
}

.equation-content {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    align-items: center;
}

.equation-label {
    font-family: 'Source Serif 4', Georgia, serif;
    font-weight: 600;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--lunar-white);
    opacity: 0.7;
}

.equation-formula {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.4rem;
    color: var(--tarnished-silver);
    letter-spacing: 0.05em;
}

.equation-note {
    font-family: 'Source Serif 4', Georgia, serif;
    font-style: italic;
    font-size: 0.85rem;
    color: var(--lunar-white);
    opacity: 0.5;
    max-width: 30ch;
}

/* ===== Concept Block ===== */
.concept-block {
    background-color: var(--midnight-navy);
    color: var(--lunar-white);
    border: 1px solid var(--oxidized-brass);
    border-top: 2px solid var(--candle-amber);
    padding: 2rem;
}

.concept-block h3 {
    font-family: 'Playfair Display', Georgia, serif;
    font-weight: 700;
    font-size: clamp(1.2rem, 2.5vw, 1.8rem);
    letter-spacing: 0.02em;
    margin-bottom: 1rem;
    color: var(--candle-amber);
}

.concept-block p {
    color: var(--lunar-white);
}

/* ===== Thought Experiment Block ===== */
.thought-experiment-block {
    background-color: var(--warm-parchment);
    color: var(--ink-dark);
    padding: 2.5rem;
    line-height: 2.0;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='100' height='100'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.5' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100' height='100' filter='url(%23n)' opacity='0.03'/%3E%3C/svg%3E");
}

.thought-experiment-block h3 {
    font-family: 'Playfair Display', Georgia, serif;
    font-weight: 400;
    font-style: italic;
    font-size: clamp(1.2rem, 2.5vw, 1.6rem);
    letter-spacing: 0.02em;
    margin-bottom: 1rem;
    color: var(--ink-dark);
}

.thought-experiment-block p {
    color: var(--ink-dark);
}

/* ===== Constellation Map ===== */
.constellation-map {
    position: relative;
    width: 100%;
    height: 100vh;
    background-color: var(--midnight-navy);
    z-index: 2;
    overflow: hidden;
    opacity: 0;
    transition: opacity 2s ease-out;
}

.constellation-map.visible {
    opacity: 1;
}

.constellation-svg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.constellation-point {
    position: absolute;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background-color: var(--tarnished-silver);
    box-shadow: 0 0 8px var(--tarnished-silver);
    z-index: 3;
    cursor: pointer;
    transition: background-color 0.6s ease-out, box-shadow 0.6s ease-out;
}

.constellation-point:hover {
    background-color: var(--candle-amber);
    box-shadow: 0 0 16px var(--candle-amber);
}

.constellation-tooltip {
    position: absolute;
    background-color: var(--parchment-cream);
    color: var(--ink-dark);
    padding: 1rem 1.2rem;
    border-radius: 2px;
    max-width: 200px;
    font-family: 'Source Serif 4', Georgia, serif;
    font-size: 0.85rem;
    line-height: 1.5;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.4s ease-out;
    z-index: 10;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.4);
}

.constellation-tooltip.active {
    opacity: 1;
}

/* SVG constellation lines */
.constellation-svg path {
    fill: none;
    stroke: var(--tarnished-silver);
    stroke-width: 1;
    opacity: 0.3;
    transition: opacity 0.6s ease-out;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .masonry-grid {
        column-count: 2;
    }

    .notebook-body {
        padding: 3rem 2rem;
    }
}

@media (max-width: 640px) {
    .masonry-grid {
        column-count: 1;
    }

    .notebook-body {
        padding: 2rem 1rem;
    }

    .equation-marginalia {
        display: none;
    }
}

/* ===== Reduced Motion ===== */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }

    .block {
        opacity: 1;
        transform: none;
    }

    .constellation-map {
        opacity: 1;
    }
}