.page-about {
    --about-gap: clamp(56px, 8vw, 96px);
    --about-num-size: clamp(36px, 5vw, 52px);
    background-color: var(--space-bg);
    color: var(--near-white);
    font-family: var(--font-body);
}

.page-about__page-header {
    position: relative;
    overflow: hidden;
    padding-top: calc(var(--header-h) + 44px);
    padding-bottom: 36px;
    border-bottom: 1px solid rgba(174, 182, 194, 0.14);
    background:
        radial-gradient(720px 260px at 85% -10%, rgba(0, 229, 255, 0.18), transparent 60%),
        radial-gradient(500px 220px at 10% 120%, rgba(0, 255, 163, 0.12), transparent 55%),
        var(--space-bg);
}

.page-about__header-inner {
    max-width: var(--container-w);
    margin-inline: auto;
    padding-inline: 20px;
}

.page-about__breadcrumb {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    margin-bottom: 22px;
    font-size: 13px;
    color: var(--metal-silver);
}

.page-about__breadcrumb a {
    color: var(--metal-silver);
    text-decoration: none;
    transition: color 0.2s ease;
}

.page-about__breadcrumb a:hover {
    color: var(--neon-green);
}

.page-about__breadcrumb [aria-current="page"] {
    color: var(--neon-cyan);
}

.page-about__kicker {
    display: inline-flex;
    padding: 6px 14px;
    border-radius: 999px;
    background: rgba(0, 255, 163, 0.1);
    border: 1px solid rgba(0, 255, 163, 0.3);
    color: var(--neon-green);
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin: 0 0 18px;
}

.page-about__page-title {
    margin: 0 0 16px;
    font-size: clamp(30px, 6vw, 44px);
    font-weight: 900;
    line-height: 1.2;
    letter-spacing: -0.01em;
    color: var(--near-white);
}

.page-about__page-intro {
    max-width: 760px;
    margin: 0;
    font-size: 17px;
    line-height: 1.8;
    color: var(--muted-blue);
}

.page-about__shell {
    max-width: var(--container-w);
    margin-inline: auto;
    padding: 0 20px;
}

.page-about__rail {
    position: relative;
    z-index: 1;
    padding: 22px 0 4px;
    border-bottom: 1px solid rgba(174, 182, 194, 0.12);
}

.page-about__rail-sticky {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 14px;
}

.page-about__rail-label {
    flex: 0 0 auto;
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--neon-cyan);
}

.page-about__chapter-nav {
    display: flex;
    gap: 8px;
    flex: 1 1 auto;
    overflow-x: auto;
    padding-bottom: 2px;
    scrollbar-width: none;
}

.page-about__chapter-nav::-webkit-scrollbar {
    display: none;
}

.page-about__chapter-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 8px 14px;
    border-radius: 999px;
    border: 1px solid rgba(0, 229, 255, 0.35);
    background: transparent;
    color: var(--muted-blue);
    font-size: 14px;
    line-height: 1;
    white-space: nowrap;
    text-decoration: none;
    transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.page-about__chapter-link:hover,
.page-about__chapter-link.is-active {
    background: var(--neon-green);
    border-color: var(--neon-green);
    color: var(--space-bg);
    transform: translateY(-1px);
}

.page-about__rail-meta {
    width: 100%;
    margin: 0;
    font-family: var(--font-mono);
    font-size: 12px;
    line-height: 1.7;
    color: var(--metal-silver);
}

.page-about__main {
    position: relative;
    padding: 8px 0 80px;
    background-image: repeating-linear-gradient(135deg, transparent 0 22px, rgba(0, 229, 255, 0.025) 22px 23px);
}

.page-about__section {
    padding-top: var(--about-gap);
}

.page-about__section-head {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    margin-bottom: 8px;
}

.page-about__section-num {
    flex: 0 0 auto;
    font-family: var(--font-mono);
    font-size: var(--about-num-size);
    line-height: 0.9;
    color: var(--neon-cyan);
    opacity: 0.55;
}

.page-about__section-title {
    margin: 0;
    font-size: 28px;
    font-weight: 800;
    line-height: 1.25;
    color: var(--near-white);
}

.page-about__section-desc {
    margin: 8px 0 0;
    font-size: 15px;
    line-height: 1.7;
    color: var(--muted-blue);
}

.page-about__brand-grid {
    display: grid;
    gap: 28px;
    margin-top: 28px;
}

.page-about__brand-copy p {
    margin: 0 0 16px;
    font-size: 15px;
    line-height: 1.8;
    color: var(--muted-blue);
}

.page-about__feature-list {
    list-style: none;
    margin: 22px 0 0;
    padding: 0;
    display: grid;
    gap: 10px;
}

.page-about__feature-list li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 14px;
    line-height: 1.65;
    color: var(--muted-blue);
}

.page-about__feature-list li::before {
    content: "";
    flex: 0 0 auto;
    align-self: center;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--neon-green);
    box-shadow: 0 0 10px rgba(0, 255, 163, 0.5);
}

.page-about__inline-cta {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 22px;
}

.page-about__btn {
    text-decoration: none;
}

.page-about__figure {
    margin: 0;
    overflow: hidden;
    border-radius: 24px;
    background: var(--surface);
    border: 1px solid rgba(174, 182, 194, 0.18);
}

.page-about__figure img {
    display: block;
    width: 100%;
    height: auto;
    object-fit: cover;
}

.page-about__figure figcaption {
    padding: 12px 16px;
    font-size: 13px;
    line-height: 1.6;
    color: var(--muted-blue);
    border-top: 1px solid rgba(174, 182, 194, 0.12);
}

.page-about__timeline {
    position: relative;
    list-style: none;
    margin: 36px 0 0;
    padding: 0;
}

.page-about__timeline::before {
    content: "";
    position: absolute;
    top: 4px;
    bottom: 4px;
    left: 7px;
    width: 2px;
    border-radius: 2px;
    background: linear-gradient(180deg, var(--neon-cyan) 0%, var(--neon-green) 60%, rgba(174, 182, 194, 0.4) 100%);
}

.page-about__milestone {
    position: relative;
    margin: 0 0 28px;
    padding-left: 40px;
}

.page-about__milestone:last-child {
    margin-bottom: 0;
}

.page-about__milestone-node {
    position: absolute;
    left: 0;
    top: 10px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--space-bg);
    border: 3px solid var(--neon-green);
    box-shadow: 0 0 0 0 rgba(0, 255, 163, 0.5);
    animation: page-about-pulse 2.6s ease-out infinite;
}

.page-about__milestone-node::after {
    content: attr(data-hint);
    position: absolute;
    left: 26px;
    top: -9px;
    padding: 4px 10px;
    border-radius: 999px;
    background: rgba(10, 17, 40, 0.94);
    border: 1px solid rgba(0, 255, 163, 0.5);
    color: var(--neon-green);
    font-family: var(--font-mono);
    font-size: 12px;
    line-height: 1.2;
    white-space: nowrap;
    opacity: 0;
    transform: translateX(-4px);
    transition: opacity 0.2s ease, transform 0.2s ease;
    z-index: 3;
    pointer-events: none;
}

.page-about__milestone:hover .page-about__milestone-node::after {
    opacity: 1;
    transform: translateX(0);
}

.page-about__milestone-card {
    position: relative;
    padding: 20px 22px;
    border-radius: 20px;
    background: linear-gradient(135deg, rgba(16, 27, 58, 0.95), rgba(26, 36, 64, 0.75));
    border: 1px solid rgba(174, 182, 194, 0.15);
    clip-path: polygon(22px 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%, 0 22px);
    transition: border-color 0.25s ease, background 0.25s ease, transform 0.25s ease;
}

.page-about__milestone-card:hover {
    border-color: rgba(0, 255, 163, 0.45);
    background: linear-gradient(135deg, rgba(16, 27, 58, 1), rgba(26, 36, 64, 0.9));
    transform: translateY(-2px);
}

.page-about__milestone-tag {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 999px;
    background: rgba(0, 229, 255, 0.12);
    border: 1px solid rgba(0, 229, 255, 0.25);
    color: var(--neon-cyan);
    font-family: var(--font-mono);
    font-size: 12px;
    line-height: 1.2;
}

.page-about__milestone-card h3 {
    margin: 14px 0 8px;
    font-size: 19px;
    font-weight: 700;
    line-height: 1.45;
    color: var(--near-white);
}

.page-about__milestone-card p {
    margin: 0;
    font-size: 15px;
    line-height: 1.75;
    color: var(--muted-blue);
}

.page-about__milestone-data {
    display: block;
    margin-top: 12px;
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.5;
    color: var(--neon-green);
}

.page-about__milestone.is-current .page-about__milestone-node {
    border-color: var(--amber);
    animation: page-about-pulse-amber 2.6s ease-out infinite;
}

.page-about__milestone.is-current .page-about__milestone-card {
    border-color: rgba(255, 200, 87, 0.35);
}

.page-about__capability-grid {
    display: grid;
    gap: 28px;
    margin-top: 28px;
}

.page-about__capability-note {
    margin: 22px 0 0;
    padding-left: 14px;
    border-left: 3px solid var(--neon-cyan);
    font-size: 14px;
    line-height: 1.75;
    color: var(--muted-blue);
}

.page-about__metrics-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
}

.page-about__metric-card {
    position: relative;
    padding: 18px;
    border-radius: 18px;
    background: var(--space-bg-2);
    border: 1px solid rgba(174, 182, 194, 0.16);
    transition: border-color 0.25s ease, transform 0.25s ease, background 0.25s ease;
}

.page-about__metric-card:hover {
    transform: translateY(-3px);
    border-color: rgba(0, 255, 163, 0.5);
    background: var(--surface);
}

.page-about__metric-arrow {
    position: absolute;
    top: 16px;
    right: 16px;
    color: var(--neon-cyan);
    opacity: 0.6;
    transition: opacity 0.2s ease, transform 0.2s ease;
}

.page-about__metric-card:hover .page-about__metric-arrow {
    opacity: 1;
    transform: translateY(-2px);
}

.page-about__metric-label {
    display: block;
    font-size: 13px;
    line-height: 1.4;
    letter-spacing: 0.04em;
    color: var(--metal-silver);
    padding-right: 22px;
}

.page-about__metric-value {
    display: block;
    margin: 12px 0 6px;
    font-family: var(--font-mono);
    font-size: clamp(28px, 4vw, 38px);
    line-height: 1;
    color: var(--neon-green);
}

.page-about__metric-unit {
    margin-left: 4px;
    font-family: var(--font-body);
    font-size: 14px;
    font-weight: 500;
    color: var(--metal-silver);
}

.page-about__metric-sub {
    margin: 0;
    font-size: 13px;
    line-height: 1.6;
    color: var(--muted-blue);
}

.page-about__metric-extra {
    display: block;
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px dashed rgba(174, 182, 194, 0.2);
    font-size: 13px;
    line-height: 1.6;
    color: var(--metal-silver);
}

.page-about__cert-grid {
    display: grid;
    gap: 28px;
    margin-top: 28px;
}

.page-about__cert-list {
    display: grid;
    gap: 14px;
}

.page-about__cert-card {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 20px 22px;
    border-radius: 20px;
    background: linear-gradient(120deg, rgba(16, 27, 58, 0.95), rgba(26, 36, 64, 0.7));
    border: 1px solid rgba(174, 182, 194, 0.16);
    transition: border-color 0.25s ease, transform 0.25s ease;
}

.page-about__cert-card:hover {
    border-color: rgba(0, 255, 163, 0.45);
    transform: translateY(-2px);
}

.page-about__cert-icon {
    flex: 0 0 auto;
    width: 40px;
    height: 40px;
    display: grid;
    place-items: center;
    border-radius: 12px;
    background: rgba(0, 255, 163, 0.12);
    color: var(--neon-green);
}

.page-about__cert-icon svg {
    width: 20px;
    height: 20px;
}

.page-about__cert-card h3 {
    margin: 0 0 6px;
    font-size: 16px;
    line-height: 1.4;
    font-weight: 700;
    color: var(--near-white);
}

.page-about__cert-card p {
    margin: 0;
    font-size: 13px;
    line-height: 1.7;
    color: var(--muted-blue);
}

.page-about__eco-grid {
    display: grid;
    gap: 28px;
    margin-top: 28px;
}

.page-about__eco-copy p {
    margin: 0 0 16px;
    font-size: 15px;
    line-height: 1.8;
    color: var(--muted-blue);
}

.page-about__eco-list {
    list-style: none;
    margin: 22px 0 0;
    padding: 0;
    display: grid;
    gap: 12px;
}

.page-about__eco-row {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 14px 16px;
    border-radius: 16px;
    background: var(--surface);
    border: 1px solid rgba(174, 182, 194, 0.14);
}

.page-about__eco-row dt {
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--neon-cyan);
}

.page-about__eco-row dd {
    margin: 0;
    font-size: 14px;
    line-height: 1.6;
    color: var(--metal-silver);
}

.page-about__cta-row {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 24px;
}

.page-about__eco-panel {
    position: relative;
    overflow: hidden;
    align-self: start;
    padding: 26px 24px;
    border-radius: 24px;
    background: linear-gradient(160deg, var(--space-bg-2) 0%, var(--surface) 100%);
    border: 1px solid rgba(0, 229, 255, 0.35);
}

.page-about__eco-panel::before {
    content: "";
    position: absolute;
    top: -40px;
    right: -40px;
    width: 140px;
    height: 140px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(0, 255, 163, 0.22), transparent 70%);
}

.page-about__eco-kicker {
    position: relative;
    z-index: 1;
}

.page-about__eco-panel-list {
    position: relative;
    z-index: 1;
    list-style: none;
    margin: 20px 0 0;
    padding: 0;
    display: grid;
    gap: 14px;
}

.page-about__eco-panel-list li {
    display: flex;
    align-items: baseline;
    gap: 10px;
    font-size: 14px;
    line-height: 1.5;
    color: var(--muted-blue);
}

.page-about__eco-panel-list strong {
    font-family: var(--font-mono);
    font-size: 26px;
    line-height: 1;
    color: var(--neon-green);
}

.page-about__eco-panel-note {
    position: relative;
    z-index: 1;
    margin: 20px 0 0;
    padding-top: 16px;
    border-top: 1px dashed rgba(174, 182, 194, 0.22);
    font-size: 13px;
    line-height: 1.7;
    color: var(--metal-silver);
}

@keyframes page-about-pulse {
    0% {
        box-shadow: 0 0 0 0 rgba(0, 255, 163, 0.5);
    }
    70% {
        box-shadow: 0 0 0 12px rgba(0, 255, 163, 0);
    }
    100% {
        box-shadow: 0 0 0 0 rgba(0, 255, 163, 0);
    }
}

@keyframes page-about-pulse-amber {
    0% {
        box-shadow: 0 0 0 0 rgba(255, 200, 87, 0.5);
    }
    70% {
        box-shadow: 0 0 0 12px rgba(255, 200, 87, 0);
    }
    100% {
        box-shadow: 0 0 0 0 rgba(255, 200, 87, 0);
    }
}

@media (min-width: 900px) {
    .page-about__brand-grid {
        grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
        align-items: center;
        gap: 40px;
    }

    .page-about__cert-grid {
        grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
        align-items: start;
        gap: 36px;
    }

    .page-about__eco-grid {
        grid-template-columns: minmax(0, 1fr) 320px;
        align-items: start;
        gap: 40px;
    }

    .page-about__eco-row {
        flex-direction: row;
        align-items: baseline;
        gap: 16px;
    }

    .page-about__eco-row dt {
        min-width: 78px;
    }
}

@media (min-width: 1024px) {
    .page-about__shell {
        display: grid;
        grid-template-columns: 280px minmax(0, 1fr);
        align-items: start;
        gap: 48px;
        padding: 0 24px 80px;
    }

    .page-about__rail {
        position: sticky;
        top: var(--header-h);
        height: calc(100vh - var(--header-h));
        padding: 48px 0 24px;
        border-bottom: 0;
    }

    .page-about__rail-sticky {
        display: block;
    }

    .page-about__chapter-nav {
        flex-direction: column;
        align-items: stretch;
        gap: 8px;
        margin-top: 20px;
        overflow: visible;
    }

    .page-about__chapter-link {
        justify-content: flex-start;
        width: 100%;
    }

    .page-about__rail-meta {
        margin-top: 28px;
        padding: 14px 16px;
        border-radius: 16px;
        border: 1px solid rgba(174, 182, 194, 0.16);
        background: var(--space-bg-2);
        font-size: 13px;
        line-height: 1.8;
    }

    .page-about__main {
        padding-top: 16px;
    }

    .page-about__capability-grid {
        grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
        align-items: start;
        gap: 32px 40px;
    }

    .page-about__metrics-grid {
        gap: 18px;
    }

    .page-about__metric-extra {
        max-height: 0;
        overflow: hidden;
        opacity: 0;
        margin-top: 0;
        padding-top: 0;
        border-top-width: 0;
        transition: max-height 0.3s ease, opacity 0.25s ease, margin-top 0.25s ease, padding-top 0.25s ease;
    }

    .page-about__metric-card:hover .page-about__metric-extra {
        max-height: 140px;
        opacity: 1;
        margin-top: 12px;
        padding-top: 12px;
        border-top-width: 1px;
    }
}