.material-ai-hero {
    padding: 72px 24px 44px;
    color: #fff;
    background: radial-gradient(circle at 18% 16%, rgba(9, 198, 249, 0.24), transparent 26%), linear-gradient(150deg, #1b2cff 0%, #6a32ff 58%, #00b8ff 100%);
}

.material-ai-hero-inner,
.material-ai-section {
    width: min(92%, var(--container, 1180px));
    margin: 0 auto;
}

.material-ai-hero h1 {
    margin: 12px 0 16px;
    font-size: clamp(2.35rem, 5vw, 4.6rem);
    line-height: 1.08;
    letter-spacing: -0.03em;
}

.material-ai-hero p {
    max-width: 850px;
    color: rgba(255,255,255,.82);
    font-size: 1.03rem;
    line-height: 1.9;
}

.material-ai-hero-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 26px;
}

    .material-ai-hero-tags span {
        padding: 8px 12px;
        border-radius: 999px;
        color: #fff;
        background: rgba(255,255,255,.12);
        border: 1px solid rgba(255,255,255,.16);
        font-size: .84rem;
        font-weight: 800;
    }

.material-ai-section {
    padding: 34px 0;
}

.material-ai-layout,
.material-ai-result-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(360px, .92fr);
    gap: 22px;
    align-items: stretch;
}

.material-ai-card {
    padding: 28px;
    border-radius: var(--radius-md, 22px);
    background: rgba(255,255,255,.78);
    border: 1px solid rgba(217,228,255,.9);
    box-shadow: var(--shadow-sm, 0 12px 30px rgba(27,56,143,.08));
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
}

    .material-ai-card h2 {
        color: var(--text-strong, #0f172a);
        margin-bottom: 12px;
        font-size: clamp(1.5rem, 2.4vw, 2.2rem);
        line-height: 1.25;
    }

    .material-ai-card h3 {
        color: var(--text-strong, #0f172a);
        margin: 22px 0 10px;
    }

.material-ai-muted,
.material-ai-note,
.material-ai-model-status {
    color: var(--muted, #5f6d86);
    line-height: 1.85;
}

.material-ai-note {
    font-size: .86rem;
    margin-top: 12px;
}

.material-ai-form {
    margin-top: 22px;
}

    .material-ai-form textarea {
        min-height: 120px;
    }

.material-ai-examples {
    margin-top: 24px;
    padding: 18px;
    border-radius: 20px;
    background: rgba(47,123,255,.08);
    border: 1px solid rgba(47,123,255,.16);
}

    .material-ai-examples h3 {
        margin: 0 0 10px;
        font-size: 1rem;
    }

    .material-ai-examples ul,
    .material-ai-mechanisms {
        padding-left: 18px;
        color: var(--muted, #5f6d86);
    }

        .material-ai-examples li,
        .material-ai-mechanisms li {
            line-height: 1.85;
        }

.material-ai-flow {
    display: grid;
    gap: 12px;
    margin-top: 18px;
}

    .material-ai-flow div {
        padding: 15px 16px;
        border-radius: 18px;
        background: rgba(255,255,255,.78);
        border: 1px solid rgba(217,228,255,.88);
    }

    .material-ai-flow strong {
        display: block;
        color: var(--text-strong, #0f172a);
        margin-bottom: 4px;
    }

    .material-ai-flow span {
        color: var(--muted, #5f6d86);
        font-size: .92rem;
    }

.material-ai-sales-copy {
    margin-top: 20px;
    padding: 18px;
    border-radius: 20px;
    color: #fff;
    background: linear-gradient(135deg, var(--primary, #2457ff), var(--accent-2, #7b39ff), var(--accent-3, #09c6f9));
    font-weight: 800;
    line-height: 1.8;
}

.material-ai-alert {
    padding: 16px 18px;
    border-radius: 18px;
    font-weight: 800;
}

    .material-ai-alert.good {
        color: #166534;
        background: #ecfdf3;
        border: 1px solid #bbf7d0;
    }

    .material-ai-alert.warn {
        color: #9a6700;
        background: #fff7ed;
        border: 1px solid #fed7aa;
    }

.material-ai-strength-box {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
    margin-top: 20px;
}

    .material-ai-strength-box div {
        padding: 18px;
        border-radius: 20px;
        background: linear-gradient(180deg, rgba(255,255,255,.92), rgba(247,249,255,.94));
        border: 1px solid rgba(217,228,255,.92);
    }

    .material-ai-strength-box span {
        display: block;
        color: var(--muted, #5f6d86);
        font-size: .86rem;
        font-weight: 800;
    }

    .material-ai-strength-box strong {
        display: block;
        color: var(--primary, #2457ff);
        font-size: 1.7rem;
        line-height: 1.2;
        margin-top: 6px;
    }

.material-ai-composition-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
}

    .material-ai-composition-list div {
        display: flex;
        justify-content: space-between;
        gap: 10px;
        padding: 10px 12px;
        border-radius: 14px;
        background: rgba(255,255,255,.8);
        border: 1px solid rgba(217,228,255,.9);
    }

    .material-ai-composition-list span {
        font-weight: 900;
        color: var(--text-strong, #0f172a);
    }

    .material-ai-composition-list strong {
        color: var(--primary, #2457ff);
    }

.material-ai-structure-view {
    height: 430px;
    border-radius: 22px;
    overflow: hidden;
    background: radial-gradient(circle at 40% 20%, rgba(47,123,255,.08), transparent 36%), #0f172a;
    border: 1px solid rgba(15,23,42,.08);
}

@media (max-width: 920px) {
    .material-ai-layout,
    .material-ai-result-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 540px) {
    .material-ai-hero,
    .material-ai-card {
        padding-left: 18px;
        padding-right: 18px;
    }

    .material-ai-strength-box,
    .material-ai-composition-list {
        grid-template-columns: 1fr;
    }

    .material-ai-structure-view {
        height: 340px;
    }
}

/* v4: element legend and stable chart sizing */
.material-ai-structure-view {
    position: relative;
}

.material-ai-atom-legend {
    position: absolute;
    left: 14px;
    right: 14px;
    bottom: 12px;
    z-index: 2;
    display: flex;
    flex-wrap: wrap;
    gap: 7px;
    pointer-events: none;
}

    .material-ai-atom-legend span {
        display: inline-flex;
        align-items: center;
        gap: 6px;
        padding: 5px 8px;
        border-radius: 999px;
        color: rgba(255,255,255,.9);
        background: rgba(15, 23, 42, .58);
        border: 1px solid rgba(255,255,255,.14);
        font-size: .74rem;
        font-weight: 800;
        backdrop-filter: blur(8px);
        -webkit-backdrop-filter: blur(8px);
    }

    .material-ai-atom-legend i {
        width: 9px;
        height: 9px;
        border-radius: 50%;
        box-shadow: 0 0 0 1px rgba(255,255,255,.35);
    }

.material-ai-card canvas {
    min-height: 300px;
}

@media (max-width: 540px) {
    .material-ai-atom-legend {
        left: 10px;
        right: 10px;
        bottom: 10px;
        gap: 5px;
    }

        .material-ai-atom-legend span {
            font-size: .68rem;
            padding: 4px 7px;
        }
}

/* Patch v5: Chart.jsが親要素の高さを再計算し続けないよう、グラフ領域を固定します。 */
.material-ai-chart-frame {
    position: relative;
    width: 100%;
    height: 320px;
    max-height: 320px;
    overflow: hidden;
}

    .material-ai-chart-frame canvas {
        display: block;
        width: 100% !important;
        height: 320px !important;
        max-height: 320px !important;
    }

.material-ai-structure-view {
    position: relative;
    overflow: hidden;
}

    .material-ai-structure-view canvas {
        display: block;
        width: 100% !important;
        height: 100% !important;
    }

.material-ai-atom-legend {
    position: absolute;
    left: 16px;
    bottom: 14px;
    right: 16px;
    z-index: 2;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    pointer-events: none;
}

    .material-ai-atom-legend span {
        display: inline-flex;
        align-items: center;
        gap: 6px;
        padding: 6px 9px;
        border-radius: 999px;
        color: rgba(255, 255, 255, 0.92);
        background: rgba(15, 23, 42, 0.56);
        border: 1px solid rgba(255, 255, 255, 0.14);
        font-size: 0.76rem;
        font-weight: 800;
        backdrop-filter: blur(8px);
        -webkit-backdrop-filter: blur(8px);
    }

    .material-ai-atom-legend i {
        width: 10px;
        height: 10px;
        border-radius: 999px;
        box-shadow: 0 0 0 2px rgba(255,255,255,0.16);
    }

@media (max-width: 540px) {
    .material-ai-chart-frame,
    .material-ai-chart-frame canvas {
        height: 280px !important;
        max-height: 280px !important;
    }
}

/* Material AI dark refinement */
.material-ai-hero {
    background: rgba(66, 77, 94, 0.92);
}

.material-ai-card,
.material-ai-flow div,
.material-ai-strength-box div,
.material-ai-composition-list div {
    background: rgba(58, 67, 82, 0.88);
    border-color: var(--line, rgba(73, 89, 112, 0.62));
}

.material-ai-muted,
.material-ai-note,
.material-ai-model-status,
.material-ai-examples ul,
.material-ai-mechanisms,
.material-ai-flow span {
    color: var(--muted, #a4b0c3);
}

.material-ai-examples {
    background: rgba(72, 96, 146, 0.26);
    border-color: rgba(112, 140, 194, 0.34);
}

.material-ai-alert.good {
    color: #89dfb7;
    background: rgba(20, 54, 40, 0.72);
    border-color: rgba(63, 130, 98, 0.72);
}

.material-ai-alert.warn {
    color: #f5c27f;
    background: rgba(58, 42, 25, 0.72);
    border-color: rgba(130, 95, 51, 0.70);
}

.material-ai-strength-box strong,
.material-ai-composition-list strong {
    color: #dce8ff;
}

.material-ai-structure-view {
    background: radial-gradient(circle at 40% 20%, rgba(95, 127, 190, 0.14), transparent 36%), #2f3b4c;
    border-color: rgba(73, 89, 112, 0.62);
}

.material-ai-hero,
.material-ai-card,
.material-ai-flow div,
.material-ai-strength-box div,
.material-ai-composition-list div {
    position: relative;
    overflow: hidden;
}

.material-ai-hero::before,
.material-ai-card::before,
.material-ai-flow div::before,
.material-ai-strength-box div::before,
.material-ai-composition-list div::before {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    background: radial-gradient(250px 160px at 12% 10%, rgba(205, 221, 248, 0.08), transparent 70%), radial-gradient(380px 240px at 88% 92%, rgba(14, 20, 30, 0.10), transparent 76%);
}