/* ----------------------------------------------------------
   Parent series heading
---------------------------------------------------------- */
.cis-series-parent {
    font-size: 1.9rem;
    font-weight: 700;
    color: #3d3525;
    margin: 10px 0 24px 0;
    padding-bottom: 6px;
    border-bottom: 2px solid rgba(90, 77, 54, 0.25);
    letter-spacing: 0.3px;
    line-height: 1.35;
}

/* ----------------------------------------------------------
   Year accordion header
---------------------------------------------------------- */
.cis-year-header {
    width: 100%;
    background: #f4f1ec;
    color: #3d3525;
    font-size: 1.35rem;
    font-weight: 600;
    padding: 14px 16px;
    margin: 26px 0 10px 0;
    border: none;
    border-radius: 6px;
    text-align: left;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    letter-spacing: 0.2px;
    transition: background 0.2s ease, color 0.2s ease;
}

.cis-year-header:hover {
    background: #ece7df;
}

.cis-year-chevron {
    font-size: 1.2rem;
    color: #5a4d36;
    transition: transform 0.25s ease;
}

.cis-year-header.active .cis-year-chevron {
    transform: rotate(90deg);
}

.cis-year-body {
    display: none;
    padding: 0 0 12px 0;
}

/* ----------------------------------------------------------
   Message accordion header (message titles)
---------------------------------------------------------- */
.cis-acc-header {
    width: 100%;
    background: #faf8f5;
    color: #3d3525;
    font-size: 1.15rem;
    font-weight: 600;
    padding: 12px 14px;
    margin: 8px 0;
    border: 1px solid rgba(90, 77, 54, 0.15);
    border-radius: 5px;
    text-align: left;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    letter-spacing: 0.15px;
    transition: background 0.2s ease, border-color 0.2s ease;
}

.cis-acc-header:hover {
    background: #f2eee8;
    border-color: rgba(90, 77, 54, 0.25);
}

.cis-acc-chevron {
    font-size: 1.1rem;
    color: #5a4d36;
    transition: transform 0.25s ease;
}

.cis-acc-header.active .cis-acc-chevron {
    transform: rotate(90deg);
}

/* ----------------------------------------------------------
   Message body
---------------------------------------------------------- */
.cis-acc-body {
    padding: 12px 16px;
    background: #fffdfb;
    border-left: 2px solid rgba(90, 77, 54, 0.25);
    margin-bottom: 12px;
    border-radius: 0 0 5px 5px;
    line-height: 1.55;
}

/* ----------------------------------------------------------
   Vertical rhythm
---------------------------------------------------------- */
.cis-year-block {
    margin-bottom: 12px;
}

.cis-year-body {
    margin-top: 6px;
}

.cis-acc-item {
    margin-bottom: 6px;
}

/* ----------------------------------------------------------
   Mobile (≤640px)
---------------------------------------------------------- */
@media (max-width: 640px) {

    .cis-series-parent {
        font-size: 1.55rem;
        margin: 6px 0 18px 0;
        padding-bottom: 4px;
    }

    .cis-year-header {
        font-size: 1.2rem;
        padding: 12px 14px;
        margin: 20px 0 8px 0;
        border-radius: 5px;
    }

    .cis-year-chevron {
        font-size: 1.1rem;
    }

    .cis-acc-header {
        font-size: 1.05rem;
        padding: 10px 12px;
        margin: 6px 0;
    }

    .cis-acc-chevron {
        font-size: 1rem;
    }

    .cis-acc-body {
        padding: 10px 14px;
        margin-bottom: 10px;
        line-height: 1.5;
    }

    .cis-year-block {
        margin-bottom: 10px;
    }

    .cis-year-body {
        margin-top: 4px;
    }

    .cis-acc-item {
        margin-bottom: 6px;
    }
}

/* ----------------------------------------------------------
   Tablet (641px–900px)
---------------------------------------------------------- */
@media (min-width: 641px) and (max-width: 900px) {

    .cis-series-parent {
        font-size: 1.75rem;
        margin: 8px 0 22px 0;
        padding-bottom: 5px;
    }

    .cis-year-header {
        font-size: 1.28rem;
        padding: 13px 16px;
        margin: 24px 0 10px 0;
        border-radius: 6px;
    }

    .cis-year-chevron {
        font-size: 1.15rem;
    }

    .cis-acc-header {
        font-size: 1.12rem;
        padding: 11px 14px;
        margin: 7px 0;
    }

    .cis-acc-chevron {
        font-size: 1.05rem;
    }

    .cis-acc-body {
        padding: 12px 16px;
        margin-bottom: 12px;
        line-height: 1.52;
    }

    .cis-year-block {
        margin-bottom: 12px;
    }

    .cis-year-body {
        margin-top: 5px;
    }

    .cis-acc-item {
        margin-bottom: 7px;
    }
}