/* =========================================================
   Valley of Boston Membership Committee
   Interactive Timeline Page
   Loads after /css/style.css
   ========================================================= */

/* Compact site-branded hero */
.timeline-hero {
    position: relative;
    overflow: hidden;
    padding: clamp(3.4rem, 6vw, 5.6rem) 0 clamp(3rem, 5vw, 4.6rem);
    background:
        radial-gradient(circle at 82% 18%, rgba(196, 160, 82, 0.22), transparent 30%),
        linear-gradient(120deg, rgba(17, 17, 17, 0.99), rgba(41, 15, 17, 0.97));
    color: var(--white);
}

.timeline-hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.018) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.018) 1px, transparent 1px);
    background-size: 34px 34px;
    pointer-events: none;
}

.timeline-hero::after {
    content: "";
    position: absolute;
    right: -170px;
    bottom: -235px;
    width: 500px;
    height: 500px;
    border: 1px solid rgba(196, 160, 82, 0.2);
    border-radius: 50%;
    box-shadow:
        0 0 0 48px rgba(196, 160, 82, 0.035),
        0 0 0 96px rgba(196, 160, 82, 0.02);
    pointer-events: none;
}

.timeline-hero-inner {
    position: relative;
    z-index: 1;
    text-align: center;
}

.timeline-hero .eyebrow {
    margin-bottom: 0.75rem;
}

.timeline-hero h1 {
    margin: 0;
    color: var(--white);
    font-family: var(--heading-font);
    font-size: clamp(2.7rem, 6vw, 5rem);
    line-height: 1;
}

.timeline-hero-intro {
    max-width: 800px;
    margin: 1.25rem auto 0;
    color: rgba(255, 255, 255, 0.78);
    font-size: clamp(1.05rem, 2vw, 1.24rem);
    line-height: 1.6;
}

.timeline-hint {
    margin: 1rem 0 0;
    color: var(--gold-light);
    font-size: 0.84rem;
    font-weight: 700;
    letter-spacing: 0.03em;
}

/* Timeline canvas */
.timeline-section {
    position: relative;
    z-index: 2;
    overflow: visible;
    background:
        linear-gradient(90deg, rgba(196, 160, 82, 0.035), transparent 22%, transparent 78%, rgba(196, 160, 82, 0.035)),
        var(--cream-light);
}

.timeline {
    position: relative;
    max-width: 1500px;
    margin: 0 auto;
    padding: 58px 40px 82px;
}

.timeline::before {
    content: "";
    position: absolute;
    left: 50%;
    top: 40px;
    bottom: 40px;
    width: 4px;
    transform: translateX(-50%);
    background: linear-gradient(var(--gold), #b9aa88 86%, var(--red));
    border-radius: 999px;
}

.event {
    position: relative;
    z-index: 1;
    width: 50%;
    padding: 0 72px 44px;
}

.event:nth-child(odd) {
    left: 0;
    text-align: right;
}

.event:nth-child(even) {
    left: 50%;
    text-align: left;
}

.event:hover,
.event:focus-within,
.event:has(.card.show-popover) {
    z-index: 100;
}

.dot {
    position: absolute;
    z-index: 3;
    top: 15px;
    width: 22px;
    height: 22px;
    border: 5px solid var(--cream-light);
    border-radius: 50%;
    background: var(--red);
    box-shadow: 0 0 0 2px var(--gold);
}

.event:nth-child(odd) .dot {
    right: -11px;
}

.event:nth-child(even) .dot {
    left: -11px;
}

.card {
    position: relative;
    z-index: 2;
    display: inline-block;
    max-width: 500px;
    padding: 1.1rem 1.25rem;
    border: 1px solid var(--border);
    border-top: 4px solid var(--red);
    border-radius: var(--radius);
    background: rgba(255, 255, 255, 0.96);
    box-shadow: 0 8px 24px rgba(18, 18, 18, 0.08);
    cursor: pointer;
    text-align: left;
    transition: transform 140ms ease, box-shadow 140ms ease, border-color 140ms ease;
}

.card:hover,
.card:focus-within {
    transform: translateY(-2px);
    border-color: #d1c5b2;
    box-shadow: 0 14px 34px rgba(18, 18, 18, 0.13);
}

.card:focus {
    outline: 3px solid var(--gold);
    outline-offset: 4px;
}

.date {
    color: var(--red);
    font-size: 0.76rem;
    font-weight: 700;
    letter-spacing: 0.11em;
    text-transform: uppercase;
}

.title {
    margin: 0.38rem 0 0;
    color: var(--black-soft);
    font-family: var(--heading-font);
    font-size: 1.22rem;
    line-height: 1.22;
}

/* Hover/tap detail panel */
.popover {
    position: absolute;
    top: calc(100% + 10px);
    z-index: 1000;
    width: min(430px, calc(100vw - 40px));
    padding: 1.15rem 1.25rem;
    border: 1px solid #d2c7b4;
    border-radius: var(--radius);
    background: var(--white);
    box-shadow: 0 18px 45px rgba(18, 18, 18, 0.17);
    color: var(--charcoal);
    text-align: left;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-4px);
    transition: opacity 140ms ease, transform 140ms ease, visibility 140ms ease;
}

.event:nth-child(odd) .popover {
    right: 0;
}

.event:nth-child(even) .popover {
    left: 0;
}

.card:hover .popover,
.card:focus .popover,
.card:focus-within .popover,
.card.show-popover .popover {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.popover .pdate {
    color: var(--red);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.popover h3 {
    margin: 0.3rem 0 0.55rem;
    color: var(--black-soft);
    font-family: var(--heading-font);
    font-size: 1.18rem;
    line-height: 1.2;
}

.popover p {
    margin: 0;
    color: var(--gray);
    font-size: 0.95rem;
    line-height: 1.55;
}

.popover a.cta {
    display: inline-block;
    margin-top: 0.85rem;
    color: var(--red);
    font-weight: 700;
    text-decoration: none;
}

.popover a.cta:hover,
.popover a.cta:focus {
    color: var(--red-dark);
    text-decoration: underline;
}

/* Historical image cards. Positions are driven by the user's eraImages map. */
.era-art {
    position: absolute;
    z-index: 0;
    border: 9px solid rgba(255, 255, 255, 0.97);
    border-radius: 2px;
    background-position: center;
    background-size: cover;
    box-shadow: 0 15px 38px rgba(18, 18, 18, 0.22);
    filter: sepia(0.04) saturate(0.96) contrast(1.02);
    opacity: 0.88;
    pointer-events: none;
}

.era-art.landscape {
    width: 560px;
    aspect-ratio: 4 / 3;
}

.era-art.portrait {
    width: 390px;
    aspect-ratio: 3 / 4;
}

.era-art.left {
    right: 14%;
}

.era-art.right {
    left: 14%;
}

.era-art.r1 { transform: rotate(-2deg); }
.era-art.r2 { transform: rotate(2deg); }
.era-art.r3 { transform: rotate(-1.5deg); }
.era-art.r4 { transform: rotate(1.5deg); }

/* Bottom membership prompt */
.timeline-cta {
    position: relative;
    z-index: 1;
    padding: 3rem 0;
    background: var(--red-dark);
    color: var(--white);
}

.timeline-cta-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
}

.timeline-cta .eyebrow {
    margin-bottom: 0.35rem;
}

.timeline-cta h2 {
    margin: 0;
    color: var(--white);
    font-family: var(--heading-font);
    font-size: clamp(1.75rem, 3vw, 2.6rem);
    line-height: 1.12;
}

@media (max-width: 1450px) {
    .era-art.landscape { width: 480px; }
    .era-art.portrait { width: 335px; }
    .era-art.left { right: 30%; }
    .era-art.right { left: 30%; }
}

@media (max-width: 1180px) {
    .timeline {
        max-width: 1100px;
        padding-inline: 24px;
    }

    .event {
        padding-inline: 54px;
    }

    .era-art {
        opacity: 0.72;
    }

    .era-art.landscape { width: 400px; }
    .era-art.portrait { width: 285px; }
    .era-art.left { right: 26%; }
    .era-art.right { left: 26%; }
}

@media (max-width: 980px) {
    .era-art {
        display: none;
    }

    .timeline-cta-inner {
        display: block;
    }

    .timeline-cta .button {
        margin-top: 1.25rem;
    }
}

@media (max-width: 760px) {
    .timeline {
        padding: 42px 20px 56px;
    }

    .timeline::before {
        left: 30px;
        top: 28px;
        bottom: 28px;
    }

    .event,
    .event:nth-child(odd),
    .event:nth-child(even) {
        left: 0;
        width: 100%;
        padding: 0 0 30px 64px;
        text-align: left;
    }

    .event:nth-child(odd) .dot,
    .event:nth-child(even) .dot {
        left: 19px;
        right: auto;
    }

    .card {
        width: 100%;
        max-width: none;
    }

    .popover,
    .event:nth-child(odd) .popover,
    .event:nth-child(even) .popover {
        right: auto;
        left: 0;
        width: 100%;
    }
}

@media (max-width: 520px) {
    .timeline-hero {
        padding: 3rem 0 2.7rem;
    }

    .timeline-hero h1 {
        font-size: clamp(2.35rem, 12vw, 3.2rem);
    }

    .timeline-hint {
        font-size: 0.78rem;
    }
}

@media (hover: none) {
    .card:hover .popover {
        opacity: 0;
        visibility: hidden;
        transform: translateY(-4px);
    }

    .card.show-popover .popover,
    .card:focus .popover,
    .card:focus-within .popover {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }
}