/* =============================================
   scire.dev — Geological Strata Design System
   ============================================= */

:root {
    /* Earth-Tone Palette */
    --surface-cream: #f0e6d3;
    --clay-blush: #c9a286;
    --sienna-core: #7a4a2e;
    --stone-shadow: #5c574e;
    --deep-stratum: #2a2420;
    --quartz-accent: #f7f2ea;
    --oxidized-copper: #6b8f7a;
    --dust: #a89079;

    /* Typography */
    --font-headline: 'Cormorant Garamond', Georgia, serif;
    --font-body: 'DM Sans', 'Inter', sans-serif;
    --font-annotation: 'IBM Plex Mono', monospace;

    /* Spacing */
    --margin-h: clamp(3rem, 12vw, 10rem);
    --angle: 7deg;
    --neg-angle: -7deg;
}

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

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

body {
    background: var(--surface-cream);
    color: var(--sienna-core);
    font-family: var(--font-body);
    overflow-x: hidden;
}

/* =========================
   Stratum Base Styles
   ========================= */

.stratum {
    position: relative;
    width: 100%;
    min-height: 100vh;
    overflow: hidden;
    display: flex;
    align-items: center;
}

.stratum-content {
    position: relative;
    z-index: 2;
    width: 100%;
    padding: 0 var(--margin-h);
}

/* Noise Texture Overlay */
.stratum-noise {
    position: absolute;
    inset: 0;
    z-index: 1;
    opacity: 0.03;
    pointer-events: none;
    background-image: 
        radial-gradient(circle at 20% 50%, var(--stone-shadow) 1px, transparent 1px),
        radial-gradient(circle at 80% 20%, var(--stone-shadow) 1px, transparent 1px),
        radial-gradient(circle at 50% 80%, var(--stone-shadow) 1px, transparent 1px);
    background-size: 4px 4px, 6px 6px, 5px 5px;
}

/* Stratum Labels (annotations) */
.stratum-label {
    position: absolute;
    top: 2rem;
    right: 2rem;
    font-family: var(--font-annotation);
    font-size: 0.75rem;
    font-weight: 300;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--dust);
    z-index: 3;
    opacity: 0.6;
}

.stratum-label-light {
    color: var(--quartz-accent);
    opacity: 0.4;
}

/* =========================
   Stratum 1 — The Surface
   ========================= */

.stratum-1 {
    background: var(--surface-cream);
    justify-content: center;
}

.stratum-1 .stratum-content {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    padding-left: calc(var(--margin-h) + 3%);
}

.hero-title {
    font-family: var(--font-headline);
    font-weight: 300;
    font-size: clamp(4rem, 12vw, 10rem);
    text-transform: lowercase;
    letter-spacing: 0.15em;
    color: var(--sienna-core);
    transform: rotate(var(--angle));
    transform-origin: left center;
    line-height: 1;
    opacity: 0;
    transition: opacity 1s ease-out;
}

.hero-title.revealed {
    opacity: 1;
}

.hero-annotation {
    font-family: var(--font-annotation);
    font-size: 0.75rem;
    font-weight: 300;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--dust);
    margin-top: 34px;
    margin-left: 8px;
    opacity: 0;
    transition: opacity 0.8s ease-out;
    transition-delay: 1.5s;
}

.hero-annotation.revealed {
    opacity: 1;
}

/* Diagonal accent line */
.diagonal-line {
    position: absolute;
    z-index: 1;
    pointer-events: none;
}

.diagonal-line-surface {
    bottom: 0;
    left: 0;
    width: 120%;
    height: 1px;
    background: var(--clay-blush);
    transform-origin: bottom left;
    transform: rotate(var(--neg-angle));
}

.diagonal-line-layer1 {
    bottom: 15vh;
    left: 0;
    width: 60%;
    height: 1px;
    background: var(--clay-blush);
    transform: rotate(var(--angle));
    transform-origin: left center;
}

/* Scroll indicator */
.scroll-indicator {
    position: absolute;
    bottom: 3rem;
    left: 50%;
    transform: translateX(-50%);
    color: var(--oxidized-copper);
    z-index: 3;
    animation: pulse-opacity 3s ease-in-out infinite;
}

@keyframes pulse-opacity {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 0.7; }
}

/* =========================
   Stratum 2 — First Layer
   ========================= */

.stratum-2 {
    background: linear-gradient(7deg, var(--clay-blush) 0%, var(--surface-cream) 100%);
}

.stratum-2-inner {
    display: flex;
    align-items: center;
    gap: clamp(2rem, 5vw, 6rem);
}

.text-block {
    flex: 1;
    max-width: 55%;
    transform: translateX(-3%);
}

.stratum-heading {
    font-family: var(--font-headline);
    font-weight: 300;
    font-size: clamp(2.4rem, 5.5vw, 5rem);
    text-transform: lowercase;
    letter-spacing: 0.15em;
    color: var(--sienna-core);
    transform: rotate(var(--angle));
    transform-origin: left center;
    margin-bottom: 34px;
    line-height: 1.1;
    opacity: 0;
    transition: opacity 0.6s ease-out;
}

.stratum-heading.revealed {
    opacity: 1;
}

.stratum-heading-light {
    color: var(--quartz-accent);
}

.body-text {
    font-family: var(--font-body);
    font-weight: 400;
    font-size: clamp(1rem, 1.8vw, 1.25rem);
    line-height: 1.75;
    color: var(--stone-shadow);
    opacity: 0;
    margin-bottom: 21px;
    clip-path: polygon(0 0, 0 0, 0 100%, 0 100%);
    transition: clip-path 0.8s cubic-bezier(0.22, 1, 0.36, 1), opacity 0.6s ease-out;
}

.body-text.revealed {
    opacity: 0.82;
    clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
}

/* Crystal Container */
.crystal-container {
    flex: 0 0 200px;
    width: 200px;
    height: 200px;
    color: var(--quartz-accent);
    opacity: 0;
    transition: opacity 1s ease-out;
}

.crystal-container.revealed {
    opacity: 1;
}

.crystal-svg {
    width: 100%;
    height: 100%;
}

/* =========================
   Stratum 3 — The Seam
   ========================= */

.stratum-3 {
    background: var(--sienna-core);
    align-items: center;
    justify-content: center;
}

.stratum-3 .stratum-content {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    padding-left: calc(var(--margin-h) + 3%);
}

/* Seam crossing lines */
.seam-lines {
    position: absolute;
    inset: 0;
    z-index: 1;
    pointer-events: none;
}

.seam-line {
    position: absolute;
    width: 140%;
    height: 1px;
    background: var(--clay-blush);
    left: -20%;
    opacity: 0.5;
}

.seam-line-pos {
    top: 40%;
    transform: rotate(7deg);
}

.seam-line-neg {
    top: 60%;
    transform: rotate(-7deg);
}

.principles-list {
    margin-top: 55px;
}

.principle {
    font-family: var(--font-headline);
    font-weight: 300;
    font-size: clamp(1.4rem, 3vw, 2.2rem);
    color: var(--quartz-accent);
    letter-spacing: 0.05em;
    line-height: 1.6;
    margin-bottom: 21px;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.principle.revealed {
    opacity: 0.9;
    transform: translateY(0);
}

/* =========================
   Stratum 4 — Deep Vein
   ========================= */

.stratum-4 {
    background: var(--deep-stratum);
    align-items: flex-start;
    padding-top: 8vh;
    padding-bottom: 8vh;
}

.stratum-4 .stratum-content {
    padding-left: calc(var(--margin-h) + 3%);
}

.stratum-4 .stratum-heading {
    color: var(--quartz-accent);
    margin-bottom: 55px;
}

.timeline {
    position: relative;
    padding-left: 60px;
}

.timeline-line {
    position: absolute;
    left: 20px;
    top: 0;
    bottom: 0;
    width: 1px;
    background: var(--oxidized-copper);
    transform: rotate(-2deg);
    transform-origin: top center;
    opacity: 0.6;
}

.timeline-waypoint {
    display: flex;
    align-items: flex-start;
    gap: 24px;
    margin-bottom: 55px;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.timeline-waypoint.revealed {
    opacity: 1;
    transform: translateY(0);
}

.waypoint-crystal {
    flex: 0 0 40px;
    width: 40px;
    height: 40px;
    color: var(--oxidized-copper);
    margin-left: -40px;
}

.crystal-svg-small {
    width: 100%;
    height: 100%;
}

.waypoint-content {
    flex: 1;
    max-width: 500px;
}

.waypoint-date {
    font-family: var(--font-annotation);
    font-size: 0.75rem;
    font-weight: 300;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--oxidized-copper);
    display: block;
    margin-bottom: 8px;
}

.waypoint-text {
    font-family: var(--font-body);
    font-weight: 400;
    font-size: clamp(0.95rem, 1.6vw, 1.15rem);
    line-height: 1.75;
    color: var(--quartz-accent);
    opacity: 0.82;
}

/* =========================
   Stratum 5 — Bedrock
   ========================= */

.stratum-5 {
    background: var(--deep-stratum);
    justify-content: center;
    align-items: center;
}

.stratum-5-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.bedrock-title {
    font-family: var(--font-headline);
    font-weight: 300;
    font-size: clamp(3rem, 8vw, 7rem);
    text-transform: lowercase;
    letter-spacing: 0.15em;
    color: var(--quartz-accent);
    line-height: 1;
    opacity: 0;
    transition: opacity 1s ease-out;
}

.bedrock-title.revealed {
    opacity: 1;
}

.bedrock-crystals {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: clamp(1rem, 3vw, 3rem);
    margin-top: 55px;
    opacity: 0;
    transition: opacity 1.2s ease-out;
}

.bedrock-crystals.revealed {
    opacity: 1;
}

.bedrock-crystal-1 {
    width: 60px;
    height: 60px;
    color: var(--quartz-accent);
}

.bedrock-crystal-2 {
    width: 100px;
    height: 100px;
    color: var(--quartz-accent);
}

.bedrock-crystal-3 {
    width: 140px;
    height: 140px;
    color: var(--quartz-accent);
}

.bedrock-annotation {
    font-family: var(--font-annotation);
    font-size: 0.75rem;
    font-weight: 300;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--dust);
    margin-top: 89px;
    opacity: 0;
    transition: opacity 0.8s ease-out;
}

.bedrock-annotation.revealed {
    opacity: 0.6;
}

/* =========================
   Parallax Accent Lines
   ========================= */

.parallax-line {
    position: fixed;
    width: 200%;
    height: 1px;
    background: var(--clay-blush);
    opacity: 0.15;
    pointer-events: none;
    z-index: 10;
    left: -50%;
}

.parallax-line-slow {
    top: 30%;
    transform: rotate(7deg);
}

.parallax-line-fast {
    top: 70%;
    transform: rotate(-7deg);
}

/* =========================
   Responsive Adjustments
   ========================= */

@media (max-width: 768px) {
    .stratum-2-inner {
        flex-direction: column;
    }

    .text-block {
        max-width: 100%;
        transform: none;
    }

    .crystal-container {
        align-self: flex-end;
    }

    .timeline {
        padding-left: 50px;
    }

    .waypoint-crystal {
        margin-left: -30px;
    }

    .bedrock-crystals {
        gap: 1rem;
    }

    .bedrock-crystal-1 {
        width: 40px;
        height: 40px;
    }

    .bedrock-crystal-2 {
        width: 70px;
        height: 70px;
    }

    .bedrock-crystal-3 {
        width: 100px;
        height: 100px;
    }
}