/* =======================================================
   SECTION 13 : SUPPORTED STRUCTURAL ELEMENTS
======================================================= */
.structures-section {
    position: relative;
    padding: 110px 5.5%;
    overflow: hidden;
    background:
        radial-gradient(circle at 88% 12%, rgba(46, 196, 255, 0.08), transparent 27%),
        radial-gradient(circle at 10% 82%, rgba(46, 213, 115, 0.06), transparent 30%),
        linear-gradient(180deg, #091927 0%, #07121f 100%);
}
.structures-section::before {
    position: absolute;
    inset: 0;
    content: "";
    opacity: 0.2;
    background-image:
        linear-gradient(rgba(96, 203, 248, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(96, 203, 248, 0.04) 1px, transparent 1px);
    background-size: 58px 58px;
    pointer-events: none;
}
.structures-section .section-header,
.structure-grid,
.capability-panel,
.structure-cta {
    position: relative;
    z-index: 1;
    width: min(1380px, 100%);
    margin-right: auto;
    margin-left: auto;
}
/* ---------- Structural element cards ---------- */
.structure-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
}
.structure-card {
    display: flex;
    flex-direction: column;
    min-height: 285px;
    padding: 23px;
    border: 1px solid rgba(132, 211, 244, 0.16);
    border-radius: 15px;
    background:
        linear-gradient(145deg, rgba(18, 46, 67, 0.78), rgba(6, 23, 37, 0.86));
    box-shadow:
        0 17px 45px rgba(0, 0, 0, 0.17),
        inset 0 1px 0 rgba(255, 255, 255, 0.035);
    transition:
        transform 0.24s ease,
        border-color 0.24s ease,
        box-shadow 0.24s ease,
        background 0.24s ease;
}
.structure-card:hover {
    transform: translateY(-6px);
    border-color: rgba(46, 196, 255, 0.4);
    background:
        linear-gradient(145deg, rgba(22, 61, 86, 0.9), rgba(7, 29, 45, 0.92));
    box-shadow:
        0 27px 60px rgba(0, 0, 0, 0.27),
        0 0 27px rgba(46, 196, 255, 0.08);
}
.structure-icon {
    display: grid;
    width: 48px;
    height: 48px;
    margin-bottom: 17px;
    color: #7ce1ff;
    border: 1px solid rgba(46, 196, 255, 0.25);
    border-radius: 11px;
    background: rgba(46, 196, 255, 0.09);
    font-size: 1.48rem;
    font-weight: 600;
    place-items: center;
}
.structure-card:nth-child(2) .structure-icon,
.structure-card:nth-child(5) .structure-icon,
.structure-card:nth-child(8) .structure-icon {
    color: #9df0bd;
    border-color: rgba(46, 213, 115, 0.25);
    background: rgba(46, 213, 115, 0.08);
}
.structure-card:nth-child(3) .structure-icon,
.structure-card:nth-child(6) .structure-icon,
.structure-card:nth-child(9) .structure-icon {
    color: #ffd18a;
    border-color: rgba(255, 177, 66, 0.25);
    background: rgba(255, 177, 66, 0.08);
}
.structure-card h3 {
    margin: 0;
    color: #e8f9ff;
    font-size: 0.92rem;
    font-weight: 600;
}
.structure-card p {
    margin: 10px 0 14px;
    color: #99b8c6;
    font-size: 0.74rem;
    line-height: 1.67;
}
.example-prompt {
    margin: 0 0 17px;
    padding: 9px 10px;
    color: #91e6ff;
    border: 1px solid rgba(46, 196, 255, 0.15);
    border-radius: 7px;
    background: rgba(2, 16, 27, 0.38);
    font-family: "Courier New", monospace;
    font-size: 0.64rem;
    line-height: 1.45;
}
.structure-card button {
    align-self: flex-start;
    margin-top: auto;
    padding: 8px 12px;
    color: #acd1df;
    border: 1px solid rgba(137, 212, 245, 0.2);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.025);
    font-size: 0.7rem;
    font-weight: 500;
    cursor: pointer;
    transition: 0.2s ease;
}
.structure-card button:hover {
    transform: translateY(-2px);
    color: #04131f;
    border-color: var(--cyan);
    background: var(--cyan);
    box-shadow: 0 9px 19px rgba(46, 196, 255, 0.2);
}
/* ---------- Structural capability panel ---------- */
.capability-panel {
    padding: 0;
    margin-top: 24px;
    overflow: hidden;
}
.capability-panel::before {
    display: none;
}
.capability-panel .card-header {
    margin: 0;
    padding: 19px 22px;
    border-bottom: 1px solid rgba(132, 211, 244, 0.13);
    background: rgba(46, 196, 255, 0.035);
}
.capability-panel .card-header h3 {
    margin: 0;
    color: #e8f9ff;
    font-size: 0.94rem;
    font-weight: 600;
}
.capability-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
}
.capability-grid > div {
    min-height: 144px;
    padding: 21px;
    border-right: 1px solid rgba(132, 211, 244, 0.1);
    transition: background 0.2s ease;
}
.capability-grid > div:last-child {
    border-right: 0;
}
.capability-grid > div:hover {
    background: rgba(46, 196, 255, 0.045);
}
.capability-grid strong {
    color: #dff5fc;
    font-size: 0.8rem;
    font-weight: 600;
}
.capability-grid p {
    margin: 10px 0 0;
    color: #91b0be;
    font-size: 0.72rem;
    line-height: 1.62;
}
/* ---------- Structural CTA ---------- */
.structure-cta {
    margin-top: 25px;
    padding: 39px 25px;
    overflow: hidden;
    border: 1px solid rgba(46, 213, 115, 0.27);
    border-radius: 16px;
    background:
        radial-gradient(circle at 75% 45%, rgba(46, 213, 115, 0.16), transparent 30%),
        linear-gradient(120deg, rgba(10, 52, 58, 0.9), rgba(7, 29, 40, 0.94));
    text-align: center;
    box-shadow:
        0 22px 54px rgba(0, 0, 0, 0.22),
        inset 0 1px 0 rgba(255, 255, 255, 0.04);
}
.structure-cta h3 {
    margin: 0;
    color: #ecfffa;
    font-size: clamp(1.35rem, 2.5vw, 1.85rem);
    font-weight: 600;
    letter-spacing: -0.04em;
}
.structure-cta p {
    max-width: 600px;
    margin: 11px auto 22px;
    color: #a8cbd1;
    font-size: 0.8rem;
    line-height: 1.65;
}
.structure-cta .primary-btn {
    background: linear-gradient(135deg, #8befb6, #2ed573);
    box-shadow: 0 12px 28px rgba(46, 213, 115, 0.2);
}
.structure-cta .primary-btn:hover {
    background: linear-gradient(135deg, #b9f8d1, #2ed573);
    box-shadow: 0 18px 35px rgba(46, 213, 115, 0.3);
}
/* ---------- Responsive structural element section ---------- */
@media (max-width: 1060px) {
    .structures-section {
        padding: 88px 4%;
    }
    .structure-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
    .capability-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
    .capability-grid > div:nth-child(2) {
        border-right: 0;
    }
    .capability-grid > div:nth-child(-n + 2) {
        border-bottom: 1px solid rgba(132, 211, 244, 0.1);
    }
}
@media (max-width: 700px) {
    .structures-section {
        padding: 72px 22px;
    }
    .structure-grid {
        grid-template-columns: 1fr;
        gap: 14px;
    }
    .structure-card {
        min-height: auto;
        padding: 20px;
    }
    .capability-grid {
        grid-template-columns: 1fr;
    }
    .capability-grid > div,
    .capability-grid > div:nth-child(2) {
        min-height: auto;
        padding: 18px;
        border-right: 0;
        border-bottom: 1px solid rgba(132, 211, 244, 0.1);
    }
    .capability-grid > div:last-child {
        border-bottom: 0;
    }
    .structure-cta {
        padding: 31px 19px;
    }
    .structure-cta .primary-btn {
        width: 100%;
    }
}