/* /about-security — dark explainer for NEXA encryption */

.about-security {
    background:
        radial-gradient(ellipse at 80% 8%, rgba(90, 69, 120, 0.18), transparent 42%),
        radial-gradient(ellipse at 10% 60%, rgba(255, 255, 255, 0.03), transparent 36%),
        #000;
    color: #f4f4f5;
    font-family: var(--f-ui);
    height: 100%;
    isolation: isolate;
    overflow-x: hidden;
    overflow-y: auto;
    width: 100%;
}

.about-security__nav {
    align-items: center;
    background: rgba(0, 0, 0, 0.72);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid #1a1a1a;
    display: flex;
    justify-content: space-between;
    padding: 14px 28px;
    position: sticky;
    top: 0;
    z-index: 8;
}

.about-security__brand {
    display: block;
    height: 18px;
}

.about-security__brand img {
    display: block;
    height: 18px;
    width: auto;
}

.about-security__back {
    align-items: center;
    color: #a1a1aa;
    display: inline-flex;
    font-size: 13px;
    font-weight: 500;
    gap: 8px;
    text-decoration: none;
}

.about-security__back:hover {
    color: #f4f4f5;
}

.about-security__back .ui-icon {
    height: 16px;
    width: 16px;
}

.about-security__main {
    margin: 0 auto;
    max-width: 880px;
    padding: 48px 24px 80px;
}

.about-security__hero {
    align-items: center;
    display: grid;
    gap: 28px;
    grid-template-columns: minmax(0, 1fr) 200px;
    margin-bottom: 56px;
}

.about-security__kicker {
    color: #8a8a8a;
    font-family: var(--f-mono);
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.12em;
    margin: 0 0 12px;
    text-transform: uppercase;
}

.about-security__title {
    font-family: var(--f-display);
    font-size: clamp(32px, 5vw, 48px);
    font-weight: 600;
    letter-spacing: -0.04em;
    line-height: 1.08;
    margin: 0 0 16px;
}

.about-security__lead {
    color: #a1a1aa;
    font-size: 17px;
    line-height: 1.55;
    margin: 0;
    max-width: 34em;
}

.about-security__art {
    height: 220px;
    justify-self: end;
    position: relative;
    width: 220px;
}

.about-security__orbit {
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 50%;
    inset: 18px;
    position: absolute;
}

.about-security__orbit--a {
    animation: about-orbit 18s linear infinite;
    border-style: dashed;
    inset: 8px;
}

.about-security__orbit--b {
    animation: about-orbit 26s linear infinite reverse;
    inset: 28px;
    opacity: 0.55;
}

.about-security__orb {
    background: radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.35), rgba(255, 255, 255, 0.02) 62%);
    border-radius: 50%;
    position: absolute;
}

.about-security__orb--sm {
    animation: about-float 5.5s ease-in-out infinite;
    height: 10px;
    left: 18px;
    top: 46px;
    width: 10px;
}

.about-security__orb--lg {
    animation: about-float 7s ease-in-out infinite reverse;
    height: 16px;
    right: 10px;
    top: 28px;
    width: 16px;
}

.about-security__art-lock {
    animation: about-float 6s ease-in-out infinite;
    display: block;
    height: 100%;
    mix-blend-mode: lighten;
    object-fit: contain;
    position: relative;
    width: 100%;
}

.about-security__section {
    margin: 0 0 48px;
}

.about-security__h2 {
    font-size: 22px;
    font-weight: 600;
    letter-spacing: -0.03em;
    margin: 0 0 10px;
}

.about-security__p {
    color: #a1a1aa;
    font-size: 15px;
    line-height: 1.6;
    margin: 0 0 16px;
}

.sec-flow {
    background: #0a0a0a;
    border: 1px solid #1d1d1d;
    border-radius: 20px;
    margin: 24px 0 12px;
    overflow: hidden;
    padding: 28px 20px 24px;
    position: relative;
}

.sec-flow__track {
    display: flex;
    flex-direction: column;
    gap: 12px;
    position: relative;
}

.sec-flow__icons {
    position: relative;
}

.sec-flow__row {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    position: relative;
    z-index: 1;
}

.sec-flow__lane {
    height: 34px;
    position: relative;
}

.sec-flow__packet {
    --flow-x: 0;
    background: #161616;
    border: 1px solid #2a2a2a;
    border-radius: 999px;
    color: #f4f4f5;
    font-family: var(--f-mono);
    font-size: 12px;
    font-weight: 500;
    left: calc((var(--flow-x) + 0.5) * 20%);
    letter-spacing: 0.04em;
    min-width: 76px;
    padding: 6px 12px;
    pointer-events: none;
    position: absolute;
    text-align: center;
    top: 0;
    transform: translateX(-50%);
    transition:
        left 0.7s cubic-bezier(0.22, 1, 0.36, 1),
        color 0.3s ease,
        border-color 0.3s ease;
    white-space: nowrap;
    z-index: 2;
}

.sec-flow__node {
    align-items: center;
    color: #6e6e6e;
    display: flex;
    flex-direction: column;
    gap: 10px;
    position: relative;
    text-align: center;
    transition: color 0.35s ease;
    z-index: 1;
}

.sec-flow__node.is-active {
    color: #f4f4f5;
}

.sec-flow__dot {
    align-items: center;
    background: #111;
    border: 1px solid #2a2a2a;
    border-radius: 14px;
    display: flex;
    height: 44px;
    justify-content: center;
    transition:
        border-color 0.35s ease,
        box-shadow 0.35s ease;
    width: 44px;
}

.sec-flow__node.is-active .sec-flow__dot {
    border-color: #5a4578;
    box-shadow: 0 0 18px rgba(124, 92, 168, 0.28);
}

.sec-flow__dot .ui-icon {
    height: 18px;
    width: 18px;
}

.sec-flow__label {
    font-size: 12px;
    font-weight: 500;
}

.sec-flow__packet.is-pop {
    animation: about-pop 0.28s cubic-bezier(0.22, 1, 0.36, 1);
}

.sec-flow__packet.is-scrambled {
    border-color: #5a4578;
    color: #c4b5d6;
}

.sec-flow__node.is-passed {
    color: #9a9a9a;
}

.sec-flow__pulse {
    border: 1px solid rgba(124, 92, 168, 0.0);
    border-radius: 16px;
    height: 44px;
    left: 50%;
    opacity: 0;
    position: absolute;
    top: 0;
    transform: translateX(-50%);
    width: 44px;
}

.sec-flow__node.is-active .sec-flow__pulse {
    animation: about-pulse 1.5s ease-out infinite;
}

.sec-flow__wire {
    background: #1d1d1d;
    height: 1px;
    left: 10%;
    overflow: visible;
    pointer-events: none;
    position: absolute;
    right: 10%;
    top: 22px;
    z-index: 0;
}

.sec-flow__spark {
    --flow-x: 0;
    background: linear-gradient(90deg, transparent, #c4b5d6, transparent);
    height: 1px;
    left: calc(var(--flow-x) * 18%);
    position: absolute;
    top: 0;
    transition: left 0.7s cubic-bezier(0.22, 1, 0.36, 1);
    width: 28%;
}

.sec-stage {
    align-items: center;
    background: #0a0a0a;
    border: 1px solid #1d1d1d;
    border-radius: 20px;
    display: grid;
    gap: 12px;
    grid-template-columns: 1fr auto 1fr;
    margin: 16px 0 0;
    min-height: 188px;
    overflow: hidden;
    padding: 28px 24px;
    position: relative;
}

.sec-stage__peer {
    align-items: flex-start;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.sec-stage__peer.is-them {
    align-items: flex-end;
}

.sec-stage__face {
    color: #8a8a8a;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.sec-stage__bubble {
    background: #161616;
    border: 1px solid #2a2a2a;
    border-radius: 14px 14px 14px 4px;
    color: #f4f4f5;
    font-size: 14px;
    font-weight: 500;
    min-height: 42px;
    min-width: 72px;
    opacity: 0;
    padding: 10px 14px;
    transform: translateY(8px);
    transition:
        opacity 0.35s ease,
        transform 0.35s ease,
        filter 0.35s ease;
}

.sec-stage__peer.is-them .sec-stage__bubble {
    border-radius: 14px 14px 4px 14px;
}

.sec-stage[data-phase="compose"] .is-you .sec-stage__bubble,
.sec-stage[data-phase="seal"] .is-you .sec-stage__bubble,
.sec-stage[data-phase="open"] .is-them .sec-stage__bubble {
    opacity: 1;
    transform: none;
}

.sec-stage[data-phase="seal"] .is-you .sec-stage__bubble {
    filter: blur(0.4px);
}

.sec-stage__mid {
    align-items: center;
    display: flex;
    flex-direction: column;
    gap: 12px;
    width: 120px;
}

.sec-stage__seal {
    align-items: center;
    display: flex;
    height: 72px;
    justify-content: center;
    position: relative;
    width: 72px;
}

.sec-stage__seal img {
    display: block;
    height: 54px;
    mix-blend-mode: lighten;
    object-fit: contain;
    position: relative;
    width: 54px;
}

.sec-stage__seal-ring {
    border: 1px dashed rgba(196, 181, 214, 0.28);
    border-radius: 50%;
    inset: -8px;
    opacity: 0.35;
    position: absolute;
    transform: scale(0.86);
    transition: transform 0.5s ease, opacity 0.5s ease;
}

.sec-stage[data-phase="seal"] .sec-stage__seal-ring,
.sec-stage[data-phase="transit"] .sec-stage__seal-ring {
    animation: about-orbit 8s linear infinite;
    opacity: 1;
    transform: scale(1);
}

.sec-stage__tiles {
    display: grid;
    gap: 4px;
    grid-template-columns: repeat(4, 14px);
    opacity: 0;
    transform: scale(0.86);
    transition: opacity 0.35s ease, transform 0.35s ease;
}

.sec-stage[data-phase="seal"] .sec-stage__tiles,
.sec-stage[data-phase="transit"] .sec-stage__tiles {
    opacity: 1;
    transform: none;
}

.sec-stage__tiles span {
    animation: about-tile 1.2s ease-in-out infinite;
    background: #2a2a2a;
    border-radius: 3px;
    display: block;
    height: 8px;
}

.sec-stage__tiles span:nth-child(2) { animation-delay: 0.08s; width: 10px; }
.sec-stage__tiles span:nth-child(3) { animation-delay: 0.16s; }
.sec-stage__tiles span:nth-child(4) { animation-delay: 0.22s; width: 8px; }
.sec-stage__tiles span:nth-child(5) { animation-delay: 0.1s; width: 12px; }
.sec-stage__tiles span:nth-child(6) { animation-delay: 0.18s; }
.sec-stage__tiles span:nth-child(7) { animation-delay: 0.26s; width: 9px; }
.sec-stage__tiles span:nth-child(8) { animation-delay: 0.32s; width: 11px; }

.sec-flow__caption {
    color: #6e6e6e;
    font-size: 13px;
    line-height: 1.5;
    margin: 8px 0 0;
    text-align: center;
}

.about-security__grid {
    display: grid;
    gap: 12px;
    grid-template-columns: 1fr 1fr;
    margin-top: 8px;
}

.about-security__card {
    background: #0c0c0c;
    border: 1px solid #1d1d1d;
    border-radius: 16px;
    padding: 20px 18px 18px;
    transition:
        border-color 0.2s ease,
        transform 0.2s ease,
        background 0.2s ease;
}

.about-security__card:hover {
    background: #101010;
    border-color: #2a2a2a;
    transform: translateY(-2px);
}

.about-security__card-ico {
    align-items: center;
    border: 1px solid #2a2a2a;
    border-radius: 10px;
    color: #cfcfcf;
    display: inline-flex;
    height: 34px;
    justify-content: center;
    margin-bottom: 12px;
    width: 34px;
}

.about-security__card-ico .ui-icon {
    height: 16px;
    width: 16px;
}

.about-security.is-ready .about-security__card-ico {
    animation: about-ico 2.8s ease-in-out infinite;
}

.about-security.is-ready .about-security__card:nth-child(2) .about-security__card-ico { animation-delay: 0.2s; }
.about-security.is-ready .about-security__card:nth-child(3) .about-security__card-ico { animation-delay: 0.4s; }
.about-security.is-ready .about-security__card:nth-child(4) .about-security__card-ico { animation-delay: 0.6s; }

.about-security__card h3 {
    font-size: 15px;
    font-weight: 600;
    letter-spacing: -0.02em;
    margin: 0 0 8px;
}

.about-security__card p {
    color: #8a8a8a;
    font-size: 13px;
    line-height: 1.5;
    margin: 0;
}

.about-security__split {
    display: grid;
    gap: 12px;
    grid-template-columns: 1fr 1fr;
}

.about-security__split-pane {
    border-radius: 16px;
    padding: 20px 18px;
}

.about-security__split-pane--you {
    background: #0c0c0c;
    border: 1px solid #1d1d1d;
}

.about-security__split-pane--server {
    background: #080808;
    border: 1px dashed #2a2a2a;
}

.about-security__split-pane h3 {
    font-size: 14px;
    font-weight: 600;
    margin: 0 0 12px;
}

.about-security__split-pane ul {
    color: #8a8a8a;
    font-size: 13px;
    line-height: 1.55;
    margin: 0;
    padding-left: 18px;
}

.sec-preview {
    background: #111;
    border: 1px solid #242424;
    border-radius: 12px;
    margin: 0 0 14px;
    padding: 10px 12px;
}

.sec-preview__kicker {
    color: #6e6e6e;
    display: block;
    font-family: var(--f-mono);
    font-size: 10px;
    letter-spacing: 0.08em;
    margin-bottom: 6px;
    text-transform: uppercase;
}

.sec-preview__line {
    color: #f4f4f5;
    font-family: var(--f-mono);
    font-size: 13px;
    margin: 0;
}

.sec-preview--locked .sec-preview__line {
    color: #a78bc8;
}

.about-security__note {
    color: #6e6e6e;
    font-family: var(--f-mono);
    font-size: 12px;
    line-height: 1.5;
    margin: 28px 0 0;
}

.about-security__cta {
    margin-top: 40px;
}

.about-security__cta-btn {
    align-items: center;
    background: #f4f4f5;
    border-radius: 12px;
    color: #0a0a0a;
    display: inline-flex;
    font-size: 14px;
    font-weight: 600;
    gap: 8px;
    padding: 12px 18px;
    text-decoration: none;
}

.about-security__cta-btn:hover {
    background: #fff;
}

.about-security__cta-btn .ui-icon {
    height: 16px;
    width: 16px;
}

.about-security:not(.is-ready) .about-security__hero,
.about-security:not(.is-ready) .about-security__section {
    opacity: 0;
}

.about-security.is-ready .about-security__hero,
.about-security.is-ready .about-security__section {
    animation: about-sec-rise 0.6s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.about-security.is-ready .about-security__hero { animation-delay: 0.04s; }
.about-security.is-ready .about-security__section:nth-child(2) { animation-delay: 0.12s; }
.about-security.is-ready .about-security__section:nth-child(3) { animation-delay: 0.2s; }
.about-security.is-ready .about-security__section:nth-child(4) { animation-delay: 0.28s; }
.about-security.is-ready .about-security__section:nth-child(5) { animation-delay: 0.36s; }

@keyframes about-sec-rise {
    from {
        opacity: 0;
        transform: translateY(16px);
    }
    to {
        opacity: 1;
        transform: none;
    }
}

@keyframes about-float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

@keyframes about-orbit {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

@keyframes about-pop {
    from { transform: translateX(-50%) scale(0.9); }
    to { transform: translateX(-50%) scale(1); }
}

@keyframes about-pulse {
    0% { opacity: 0.55; transform: translateX(-50%) scale(1); }
    100% { opacity: 0; transform: translateX(-50%) scale(1.55); }
}

@keyframes about-tile {
    0%, 100% { opacity: 0.35; }
    50% { opacity: 1; }
}

@keyframes about-ico {
    0%, 100% { border-color: #2a2a2a; }
    50% { border-color: #5a4578; }
}

@media (max-width: 720px) {
    .about-security__nav {
        padding: 12px 16px;
    }

    .about-security__hero,
    .about-security__grid,
    .about-security__split {
        grid-template-columns: 1fr;
    }

    .about-security__art {
        height: 140px;
        justify-self: start;
        width: 140px;
    }

    .sec-flow__row {
        gap: 16px 0;
        grid-template-columns: 1fr 1fr;
    }

    .sec-flow__wire,
    .sec-flow__lane {
        display: none;
    }

    .sec-stage {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .sec-stage__peer,
    .sec-stage__peer.is-them {
        align-items: center;
    }

}

@media (prefers-reduced-motion: reduce) {
    .about-security.is-ready .about-security__hero,
    .about-security.is-ready .about-security__section,
    .about-security:not(.is-ready) .about-security__hero,
    .about-security:not(.is-ready) .about-security__section,
    .about-security.is-ready .about-security__card-ico,
    .about-security__orbit,
    .about-security__orb,
    .about-security__art-lock,
    .sec-flow__pulse,
    .sec-stage__tiles span {
        animation: none;
        opacity: 1;
        transform: none;
    }

    .sec-flow__packet {
        transition: none;
    }

    .about-security__card:hover {
        transform: none;
    }
}