.explainer {
    max-width: 1200px;
    margin: 0 auto;
    padding: 5rem 2rem;
}


/* --------------------------
   Hero
   -------------------------- */

.explainer-hero {
    max-width: 700px;
    margin: 0 auto 1rem;
    text-align: center;
}

.explainer-hero h1 {
    margin-bottom: 1rem;
    font-size: 1.9rem;
}

.intro {
    color: #555;
    line-height: 1.8;
}


/* =========================================================
   EXCAVATION EXHIBIT
   ========================================================= */


/* --------------------------
   Top Cards
   -------------------------- */

.excavation-cards {
    display: grid;
    grid-template-columns: 0.8fr 1.2fr;
    gap: 4rem;

    max-width: 1050px;
    margin: 0 auto;

    position: relative;
    z-index: 3;

    /* lets the cards overlap the landscape */
    transform: translateY(60px);
}

.excavation-card {
    padding: 1.75rem 2rem;

    background: #fff;
    border: 1px solid #d8d3cc;
    border-radius: 12px;
}

.excavation-card h2 {
    margin: 0;
    font-size: 1.25rem;
}

.card-heading {
    display: flex;
    align-items: center;
    gap: 0.8rem;

    padding-bottom: 0.8rem;
    margin-bottom: 1rem;

    border-bottom: 1px solid #e5e1dc;
}

.card-icon {
    font-size: 1.25rem;
}

.excavation-intro p {
    max-width: 380px;
    margin: 0;

    font-size: 0.95rem;
    line-height: 1.7;
    text-align: left;
}


/* --------------------------
   Status Card
   -------------------------- */

.status-card h2 {
    padding-bottom: 0.8rem;
    margin-bottom: 0.75rem;

    border-bottom: 1px solid #e5e1dc;
}

.status-item {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1.5rem;

    margin-top: 1rem;
}

.status-item .label {
    display: flex;
    flex-direction: column;

    color: #555;
    font-size: 0.9rem;
    line-height: 1.4;
    text-align: left;
}

.status-item small {
    margin-top: 0.15rem;

    color: #666;
    font-size: 0.85rem;

    opacity: 0.7;
}

.status-item strong {
    max-width: 65%;

    font-size: 0.9rem;
    line-height: 1.5;
    font-weight: 600;
    text-align: right;
}


/* --------------------------
   Landscape
   -------------------------- */

.dig-landscape {
    width: 100%;
    height: 390px;

    position: relative;
    overflow: hidden;

    background-color: #faf8f4;
    background-image: url("../img/dig-landscape.png");
    background-repeat: no-repeat;
    background-position: center bottom;
    background-size: 100% auto;

    border-radius: 50px;
}

.landscape {
    width: 100%;
    height: 100%;

    position: relative;
}


/* --------------------------
   Dig Site
   -------------------------- */

.dig-site {
    width: 100%;
    height: 100%;

    position: relative;
    z-index: 2;
}


/* --------------------------
   Layers
   -------------------------- */

.layer {
    position: absolute;
    left: 50%;
    bottom: 78px;

    transition:
        transform 700ms cubic-bezier(.22, 1, .36, 1),
        opacity 500ms ease;
}


/* AI Agent Rock */

.agent-rock {
    width: 170px;

    display: flex;
    align-items: center;
    justify-content: center;
}

.agent-rock-img {
    display: block;
    width: 100%;
    height: auto;
}

.agent-rock span {
    position: absolute;
    top: 53%;
    left: 50%;

    transform: translate(-50%, -50%);

    font-size: 0.9rem;
    font-weight: 600;
    white-space: nowrap;
}


/* Excavated Layers */

.excavation-layer {
    width: 320px;
    padding: 18px 28px;

    background: rgba(244, 232, 214, 0.62);
    border-radius: 14px;

    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;

    text-align: center;
}

.excavation-layer strong {
    font-size: 1.05rem;
    font-weight: 600;
}

.excavation-layer span {
    color: #666;
    font-size: 0.85rem;
    line-height: 1.5;
}


/* --------------------------
   Dig Instruction
   -------------------------- */

.dig-instruction {
    position: absolute;
    left: 50%;
    bottom: 185px;

    transform: translateX(-50%);

    width: 100%;
    height: 3rem;
    margin: 0;

    display: flex;
    align-items: center;
    justify-content: center;

    color: #555;
    font-size: 0.95rem;
    font-style: italic;

    transition: opacity 300ms ease;
}

.dig-instruction.instruction-hidden {
    opacity: 0;
    pointer-events: none;
}


/* --------------------------
   Dig Controls
   -------------------------- */

.dig-controls {
    position: absolute;
    left: 50%;
    bottom: 24px;

    transform: translateX(-50%);

    display: flex;
    align-items: center;
    justify-content: center;
    gap: 24px;

    white-space: nowrap;
}

#dig-button,
#back-button {
    margin: 0;
    padding: 0.25rem;

    border: 0;
    background: none;

    font: inherit;
    font-weight: 500;

    cursor: pointer;

    text-decoration: underline;
    text-underline-offset: 5px;

    transition: opacity 200ms ease;
}

#dig-button:hover,
#back-button:hover {
    opacity: 0.6;
}

#dig-button.dig-complete {
    opacity: 0;
    pointer-events: none;
}


/* =========================================================
   LAB EXPLANATION
   ========================================================= */

.lab-explained {
    max-width: 1100px;
    margin: 6rem auto;
    padding: 0 2rem;
}


/* --------------------------
   Explanation Intro
   -------------------------- */

.lab-intro {
    max-width: 900px;
    margin: 0 auto 4.5rem;

    text-align: center;
}

.lab-intro h2 {
    margin-bottom: 1rem;
}

.lab-intro .section-intro {
    margin: 0;

    color: #666;
    font-size: 0.85rem;
    line-height: 1.8;
}


/* --------------------------
   Explanation Layout
   -------------------------- */

.lab-content {
    display: grid;
    grid-template-columns: minmax(0, 650px) 320px;
    justify-content: space-between;
    align-items: start;
    gap: 5rem;
}


/* --------------------------
   Main Explanation
   -------------------------- */

.lab-main {
    text-align: left;
}

.lab-main h3 {
    margin: 0 0 1.5rem;

    font-size: 1.2rem;
    line-height: 1.4;
}

.lab-main p {
    margin: 0 0 1.4rem;

    color: #444;
    font-size: 1rem;
    line-height: 1.85;
}

.lab-main p:last-child {
    margin-bottom: 0;
}

.lab-main strong {
    color: #222;
    font-weight: 600;
}


/* =========================================================
   LAB NOTES
   Notebook paper
   ========================================================= */

.lab-sidebar {
    position: sticky;
    top: 2rem;

    padding: 2.5rem 2rem 2.25rem 4.25rem;

    background-color: #fafbf9;

    /* notebook rules */
    background-image:
        repeating-linear-gradient(to bottom,
            transparent 0,
            transparent 31px,
            rgba(90, 110, 100, 0.10) 31px,
            rgba(90, 110, 100, 0.10) 32px);

    border: 1px solid #e1e5e1;
    border-radius: 4px;

    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);

    text-align: left;
    overflow: hidden;
}


/* Green notebook margin */

.lab-sidebar::before {
    content: "";

    position: absolute;
    top: 0;
    bottom: 0;
    left: 2.2rem;

    width: 1px;

    background: rgba(47, 125, 91, 0.25);
}


/* Lab Notes heading */

.lab-sidebar h3 {
    margin: 0 0 1.75rem;

    font-family: "Caveat", cursive;
    font-size: 1.8rem;
    font-weight: 500;
    line-height: 1;

    color: #222;
    text-align: left;

    transform: rotate(-2deg);
}


/* --------------------------
   Individual Notes
   -------------------------- */

.lab-sidebar .idea-item {
    display: grid;
    grid-template-columns: 7px 1fr;
    gap: 1rem;
    align-items: start;

    margin: 0 0 1.4rem;
}

.lab-sidebar .idea-item:last-of-type {
    margin-bottom: 0;
}


/* Green bullet */

.lab-sidebar .note-dot {
    width: 6px;
    height: 6px;

    margin-top: 0.65rem;

    background: #2f8a63;
    border-radius: 50%;
}


/* Note copy */

.lab-sidebar .idea-item p {
    margin: 0;

    color: #555;
    font-size: 0.95rem;
    line-height: 1.7;
    text-align: left;
}


/* --------------------------
   Next Lab
   -------------------------- */

.lab-sidebar .next-lab {
    margin-top: 2.75rem;
    padding-top: 1.5rem;

    border-top: 1px solid #dfe3df;
}

.lab-sidebar .next-lab-label {
    margin: 0 0 1.5rem;

    color: #777;
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    text-align: center;
}

.lab-sidebar .next-lab-content {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 1rem;
    align-items: center;
}

.lab-sidebar .coming-soon {
    font-family: "Caveat", cursive;
    font-size: 1.2rem;
    line-height: 1;

    white-space: nowrap;

    transform: rotate(-4deg);
}

.lab-sidebar .next-lab-title {
    color: #222;
    font-size: 0.8rem;
    font-weight: 600;
    line-height: 1.45;
    letter-spacing: 0.04em;

    text-transform: uppercase;
    text-align: left;
}

/* =========================================================
   RESPONSIVE
   ========================================================= */

@media (max-width: 900px) {

    .explainer {
        padding-left: 1.5rem;
        padding-right: 1.5rem;
    }

    .excavation-cards {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .status-item strong {
        max-width: 60%;
    }

    .lab-content {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

    .lab-sidebar {
        position: relative;
        top: auto;

        width: calc(100% - 32px);
        margin: 0 auto;

        overflow: hidden;
    }

    .lab-sidebar::before {
        top: 0;
        bottom: 0;
        left: 2.2rem;
    }

}


@media (max-width: 600px) {

    .explainer {
        padding: 3rem 1rem;
    }

    .excavation-cards {
        transform: translateY(40px);
    }

    .excavation-card {
        padding: 1.4rem;
    }

    .status-item {
        gap: 1rem;
    }

    .status-item strong {
        max-width: 55%;
    }

    .dig-landscape {
        height: 390px;
        border-radius: 30px;
    }

    .excavation-layer {
        width: min(280px, calc(100vw - 80px));
        padding: 16px 20px;
    }

    .lab-explained {
        margin: 4rem auto;
        padding: 0 1rem;
    }

    .lab-intro {
        margin-bottom: 3rem;
    }

    .lab-content {
        gap: 3rem;
    }

    .lab-sidebar {
        padding:
            2.25rem 1.5rem 2rem 3.75rem;
    }

    .lab-sidebar::before {
        left: 1.9rem;
    }

    .lab-sidebar .next-lab-content {
        grid-template-columns: 1fr;
        gap: 0.75rem;
    }
}