/* ===================================================
   rollup.quest - Geological Descent Narrative
   =================================================== */

/* --- CSS Custom Properties --- */
:root {
    --midnight-navy: #0B1D3A;
    --forge-charcoal: #1A1F2E;
    --oxidized-copper: #7A5C3E;
    --crystal-pale: #C8D6E5;
    --quartz-glint: #E8EEF4;
    --parchment-warm: #F0E8DA;
    --obsidian: #080E1A;
    --burnished-steel: #4A5568;
    --ore-navy: #0D2847;

    --font-display: 'Cormorant Garamond', 'Georgia', serif;
    --font-body: 'Source Serif 4', 'Georgia', serif;
    --font-mono: 'DM Mono', 'Courier New', monospace;
}

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

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    font-family: var(--font-body);
    font-weight: 400;
    font-size: clamp(1rem, 1.2vw, 1.15rem);
    line-height: 1.72;
    color: var(--midnight-navy);
    background: var(--parchment-warm);
    overflow-x: hidden;
}

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

/* --- Noise Overlay --- */
.noise-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1000;
    filter: url(#noiseFilter);
    opacity: 0.06;
    mix-blend-mode: multiply;
}

.noise-overlay::after {
    content: '';
    display: block;
    width: 100%;
    height: 100%;
    background: var(--parchment-warm);
}

/* --- Scroll Progress --- */
.scroll-progress {
    position: fixed;
    right: 0;
    top: 0;
    width: 2px;
    height: 100vh;
    z-index: 999;
    background: rgba(26, 31, 46, 0.1);
}

.scroll-progress-fill {
    width: 100%;
    height: 0%;
    background: linear-gradient(to bottom, var(--midnight-navy), var(--crystal-pale), var(--quartz-glint));
    transition: height 0.1s linear;
}

/* --- Ripple Container --- */
.ripple-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 998;
    overflow: hidden;
}

.ripple {
    position: absolute;
    border-radius: 50%;
    border: 1px solid var(--crystal-pale);
    background: transparent;
    opacity: 0.15;
    transform: scale(0);
    animation: rippleExpand 1200ms cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
}

@keyframes rippleExpand {
    0% {
        transform: scale(0);
        opacity: 0.15;
    }
    100% {
        transform: scale(4);
        opacity: 0;
    }
}

/* --- Strata Base --- */
.stratum {
    position: relative;
    min-height: 100vh;
    width: 100%;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.stratum-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

.stratum-content {
    position: relative;
    z-index: 2;
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 4rem 2rem;
}

/* --- Crystal Dividers --- */
.crystal-divider {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    pointer-events: none;
}

.crystal {
    position: absolute;
    left: var(--crystal-left, 50%);
    top: var(--crystal-top, 50%);
    width: calc(40px * var(--crystal-scale, 1));
    height: calc(120px * var(--crystal-scale, 1));
    background: linear-gradient(
        135deg,
        rgba(11, 29, 58, var(--crystal-opacity, 0.1)),
        rgba(200, 214, 229, calc(var(--crystal-opacity, 0.1) * 0.6)),
        rgba(11, 29, 58, calc(var(--crystal-opacity, 0.1) * 0.8))
    );
    transform: rotate(var(--crystal-rotation, 0deg)) scale(0);
    clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
    transition: transform 800ms cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.crystal.crystal-large {
    width: calc(60px * var(--crystal-scale, 1));
    height: calc(180px * var(--crystal-scale, 1));
}

.crystal.visible {
    transform: rotate(var(--crystal-rotation, 0deg)) scale(1);
}

/* --- Stratum 0: Hero / Surface --- */
.stratum-0 {
    background: var(--parchment-warm);
    flex-direction: column;
}

.stratum-0 .stratum-bg {
    background:
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 60px,
            rgba(122, 92, 62, 0.03) 60px,
            rgba(122, 92, 62, 0.03) 61px
        ),
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 8px,
            rgba(122, 92, 62, 0.015) 8px,
            rgba(122, 92, 62, 0.015) 9px
        );
}

.wax-seal {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: var(--midnight-navy);
    box-shadow:
        inset 2px 2px 4px rgba(0, 0, 0, 0.4),
        inset -1px -1px 2px rgba(200, 214, 229, 0.2),
        0 2px 8px rgba(0, 0, 0, 0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    z-index: 3;
}

.wax-seal-letter {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 1.4rem;
    color: var(--crystal-pale);
    letter-spacing: 0.02em;
}

.wax-seal-top {
    margin-bottom: 2rem;
}

.hero-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding-top: 15vh;
    padding-bottom: 10vh;
}

.hero-title {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: clamp(4rem, 12vw, 9rem);
    color: var(--midnight-navy);
    letter-spacing: 0.02em;
    line-height: 1.05;
    margin-bottom: 1.5rem;
}

.hero-dot {
    color: var(--oxidized-copper);
}

.hero-subtitle {
    font-family: var(--font-display);
    font-weight: 400;
    font-style: italic;
    font-size: clamp(1.2rem, 2.5vw, 1.8rem);
    color: var(--burnished-steel);
    letter-spacing: 0.02em;
}

.scroll-chevron {
    position: absolute;
    bottom: 3rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 3;
    animation: chevronPulse 2s ease-in-out infinite;
}

@keyframes chevronPulse {
    0%, 100% { opacity: 0.4; transform: translateX(-50%) translateY(0); }
    50% { opacity: 0.8; transform: translateX(-50%) translateY(6px); }
}

/* --- Stratum 1: Forge --- */
.stratum-1 {
    background: var(--forge-charcoal);
}

.stratum-1 .stratum-bg {
    background:
        radial-gradient(ellipse at 20% 50%, rgba(122, 92, 62, 0.05) 0%, transparent 60%),
        radial-gradient(ellipse at 80% 30%, rgba(122, 92, 62, 0.03) 0%, transparent 50%);
}

.forge-texture {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    filter: url(#forgeMarks);
    z-index: 1;
    pointer-events: none;
}

.forge-texture::after {
    content: '';
    display: block;
    width: 100%;
    height: 100%;
    background: var(--forge-charcoal);
}

.forge-panels {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 3rem;
    align-items: start;
}

.forge-panel {
    border: 1px solid var(--oxidized-copper);
    padding: 2.5rem;
    position: relative;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 600ms ease, transform 600ms ease;
}

.forge-panel.visible {
    opacity: 1;
    transform: translateY(0);
}

.forge-panel-left {
    margin-top: 4rem;
}

.forge-panel-right {
    margin-top: 10rem;
    transition-delay: 200ms;
}

.panel-label {
    font-family: var(--font-mono);
    font-weight: 400;
    font-size: 0.75rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--burnished-steel);
    display: block;
    margin-bottom: 1.5rem;
}

.panel-heading {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: clamp(2.5rem, 8vw, 4rem);
    color: var(--crystal-pale);
    letter-spacing: 0.02em;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    clip-path: inset(0 100% 0 0);
    transition: clip-path 900ms cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.forge-panel.visible .panel-heading {
    clip-path: inset(0 0% 0 0);
}

.panel-text {
    font-family: var(--font-body);
    color: var(--crystal-pale);
    opacity: 0.85;
    margin-bottom: 1.2rem;
    font-size: clamp(1rem, 1.2vw, 1.15rem);
    line-height: 1.72;
}

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

/* --- Stratum 2: Ore Vein --- */
.stratum-2 {
    background: var(--forge-charcoal);
}

.stratum-2 .stratum-bg {
    background: linear-gradient(
        165deg,
        var(--forge-charcoal) 0%,
        var(--ore-navy) 35%,
        var(--ore-navy) 65%,
        var(--forge-charcoal) 100%
    );
}

.diagonal-band {
    position: relative;
    width: 100%;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 6rem 2rem;
    transform: skewY(-3deg);
}

.diagonal-band > * {
    transform: skewY(3deg);
}

.ore-content {
    max-width: 680px;
    margin: 0 auto;
    position: relative;
    z-index: 2;
    opacity: 0;
    transform: skewY(3deg) translateY(30px);
    transition: opacity 600ms ease, transform 600ms ease;
}

.ore-content.visible {
    opacity: 1;
    transform: skewY(3deg) translateY(0);
}

.ore-heading {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: clamp(2.5rem, 6vw, 5rem);
    color: var(--quartz-glint);
    letter-spacing: 0.02em;
    line-height: 1.1;
    margin-bottom: 2rem;
}

.ore-text {
    font-family: var(--font-body);
    color: var(--crystal-pale);
    opacity: 0.9;
    margin-bottom: 1.5rem;
    font-size: clamp(0.95rem, 1.1vw, 1.1rem);
    line-height: 1.72;
}

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

/* --- Stratum 3: Crystal Cavern --- */
.stratum-3 {
    background: var(--obsidian);
    min-height: 100vh;
}

.stratum-3 .stratum-bg {
    background:
        radial-gradient(ellipse at 30% 40%, rgba(200, 214, 229, 0.03) 0%, transparent 50%),
        radial-gradient(ellipse at 70% 60%, rgba(232, 238, 244, 0.02) 0%, transparent 40%),
        radial-gradient(ellipse at 50% 80%, rgba(13, 40, 71, 0.15) 0%, transparent 60%),
        linear-gradient(180deg, var(--obsidian) 0%, #0a1428 50%, var(--obsidian) 100%);
}

.crystal-reflections {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    pointer-events: none;
}

.reflection {
    position: absolute;
    left: var(--r-left, 50%);
    top: var(--r-top, 50%);
    width: var(--r-size, 100px);
    height: var(--r-size, 100px);
    background: linear-gradient(
        var(--r-angle, 45deg),
        transparent 30%,
        rgba(200, 214, 229, 0.03) 45%,
        rgba(232, 238, 244, 0.05) 50%,
        rgba(200, 214, 229, 0.03) 55%,
        transparent 70%
    );
    transform: rotate(var(--r-angle, 0deg));
    animation: reflectionShimmer 6s ease-in-out infinite;
    animation-delay: calc(var(--r-size, 100px) * 10ms);
}

@keyframes reflectionShimmer {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 1; }
}

.cavern-content {
    display: flex;
    justify-content: center;
    padding-top: 10vh;
    padding-bottom: 10vh;
}

.cavern-column {
    max-width: 540px;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 600ms ease, transform 600ms ease;
}

.cavern-column.visible {
    opacity: 1;
    transform: translateY(0);
}

.cavern-heading {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: clamp(2.5rem, 7vw, 5.5rem);
    color: var(--quartz-glint);
    letter-spacing: 0.02em;
    line-height: 1.05;
    margin-bottom: 2rem;
}

.cavern-text {
    font-family: var(--font-body);
    color: var(--crystal-pale);
    opacity: 0.85;
    margin-bottom: 1.5rem;
    font-size: clamp(1rem, 1.2vw, 1.15rem);
    line-height: 1.72;
}

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

/* --- Stratum 4: Emergence --- */
.stratum-4 {
    background: var(--parchment-warm);
    min-height: 100vh;
}

.stratum-4 .stratum-bg {
    background: linear-gradient(
        180deg,
        var(--forge-charcoal) 0%,
        var(--ore-navy) 15%,
        #2a3a52 30%,
        #6b7d94 50%,
        var(--parchment-warm) 80%
    );
}

.emergence-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding-top: 20vh;
    padding-bottom: 10vh;
    min-height: 100vh;
    justify-content: center;
}

.emergence-statement {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 800ms ease, transform 800ms ease;
}

.emergence-statement.visible {
    opacity: 1;
    transform: translateY(0);
}

.emergence-heading {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: clamp(2.5rem, 8vw, 7rem);
    color: var(--quartz-glint);
    letter-spacing: 0.02em;
    line-height: 1.1;
    margin-bottom: 2rem;
    transition: color 1.5s ease;
}

.stratum-4-surfaced .emergence-heading {
    color: var(--midnight-navy);
}

.emergence-text {
    font-family: var(--font-display);
    font-weight: 400;
    font-style: italic;
    font-size: clamp(1.2rem, 2.5vw, 1.8rem);
    color: var(--crystal-pale);
    max-width: 600px;
    margin: 0 auto 3rem;
    transition: color 1.5s ease;
}

.stratum-4-surfaced .emergence-text {
    color: var(--burnished-steel);
}

.wax-seal-bottom {
    margin: 2rem auto;
}

.emergence-meta {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin-top: 2rem;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 600ms ease 400ms, transform 600ms ease 400ms;
}

.emergence-meta.visible {
    opacity: 1;
    transform: translateY(0);
}

.meta-label {
    font-family: var(--font-mono);
    font-weight: 400;
    font-size: 0.75rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--burnished-steel);
    transition: color 1.5s ease;
}

.meta-divider {
    width: 40px;
    height: 1px;
    background: var(--oxidized-copper);
}

/* --- Reveal Animations --- */
.reveal-element {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 600ms ease, transform 600ms ease;
}

.reveal-element.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Staggered paragraph reveal within visible parents */
.visible .panel-text,
.visible .ore-text,
.visible .cavern-text {
    opacity: 0;
    transform: translateY(20px);
    animation: textReveal 600ms ease forwards;
}

.visible .panel-text:nth-child(3) { animation-delay: 80ms; }
.visible .panel-text:nth-child(4) { animation-delay: 160ms; }
.visible .ore-text:nth-child(3) { animation-delay: 80ms; }
.visible .ore-text:nth-child(4) { animation-delay: 160ms; }
.visible .ore-text:nth-child(5) { animation-delay: 240ms; }
.visible .cavern-text:nth-child(3) { animation-delay: 80ms; }
.visible .cavern-text:nth-child(4) { animation-delay: 160ms; }
.visible .cavern-text:nth-child(5) { animation-delay: 240ms; }

@keyframes textReveal {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 0.85;
        transform: translateY(0);
    }
}

/* --- Responsive --- */
@media (max-width: 768px) {
    .forge-panels {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .forge-panel-left {
        margin-top: 0;
    }

    .forge-panel-right {
        margin-top: 0;
    }

    .forge-panel {
        padding: 1.5rem;
    }

    .hero-title {
        font-size: clamp(3rem, 14vw, 5rem);
    }

    .diagonal-band {
        transform: skewY(-1.5deg);
        padding: 4rem 1.5rem;
    }

    .diagonal-band > * {
        transform: skewY(1.5deg);
    }

    .ore-content {
        transform: skewY(1.5deg) translateY(30px);
    }

    .ore-content.visible {
        transform: skewY(1.5deg) translateY(0);
    }

    .stratum-content {
        padding: 3rem 1.5rem;
    }

    .emergence-heading {
        font-size: clamp(2rem, 10vw, 4rem);
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: clamp(2.5rem, 16vw, 4rem);
    }

    .panel-heading {
        font-size: clamp(1.8rem, 7vw, 2.5rem);
    }

    .cavern-heading {
        font-size: clamp(2rem, 9vw, 3.5rem);
    }
}

/* --- Prefers Reduced Motion --- */
@media (prefers-reduced-motion: reduce) {
    .crystal {
        transition: none;
        transform: rotate(var(--crystal-rotation, 0deg)) scale(1);
    }

    .ripple {
        animation: none;
        display: none;
    }

    .scroll-chevron {
        animation: none;
        opacity: 0.6;
    }

    .reflection {
        animation: none;
    }

    .reveal-element,
    .forge-panel,
    .ore-content,
    .cavern-column,
    .emergence-statement,
    .emergence-meta {
        opacity: 1;
        transform: none;
        transition: none;
    }

    .panel-heading {
        clip-path: none;
        transition: none;
    }

    .visible .panel-text,
    .visible .ore-text,
    .visible .cavern-text {
        animation: none;
        opacity: 0.85;
        transform: none;
    }
}