:root {
    --bg: #10100f;
    --bg-soft: #151514;
    --surface: #1b1b19;
    --surface-strong: #23231f;
    --line: rgba(225, 231, 230, 0.13);
    --line-strong: rgba(225, 231, 230, 0.24);
    --text: #f3f2eb;
    --muted: #b9bbb4;
    --quiet: #81847c;
    --accent: #8ed7ff;
    --accent-strong: #c4ecff;
    --amber: #e5c06f;
    --red: #f87171;
    --shadow: rgba(0, 0, 0, 0.32);
    --max-width: 1180px;
    --radius: 8px;
    --font-sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", sans-serif;
    --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    min-height: 100vh;
    background:
        linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px),
        linear-gradient(180deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px),
        var(--bg);
    background-size: 72px 72px;
    color: var(--text);
    font-family: var(--font-sans);
    line-height: 1.65;
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    z-index: -1;
    pointer-events: none;
    background:
        linear-gradient(180deg, rgba(16, 16, 15, 0.22), var(--bg) 76%),
        linear-gradient(135deg, rgba(142, 215, 255, 0.08), transparent 34%),
        linear-gradient(225deg, rgba(237, 200, 121, 0.05), transparent 30%);
}

img {
    display: block;
    max-width: 100%;
}

a {
    color: inherit;
    text-decoration: none;
}

code {
    border: 1px solid var(--line);
    border-radius: 6px;
    background: rgba(255, 255, 255, 0.04);
    color: var(--accent);
    font-family: var(--font-mono);
    font-size: 0.92em;
    padding: 0.08rem 0.35rem;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    border-bottom: 1px solid transparent;
    background: rgba(16, 16, 15, 0.74);
    backdrop-filter: blur(16px);
    transition: border-color 180ms ease, background 180ms ease;
}

.site-header.is-scrolled {
    border-color: var(--line);
    background: rgba(16, 16, 15, 0.9);
}

.nav-shell,
.hero,
.section,
.sentinel-section,
.footer-inner,
.copyright {
    width: min(var(--max-width), calc(100% - 40px));
    margin: 0 auto;
}

.nav-shell {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 76px;
    gap: 1.5rem;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 0.72rem;
    color: var(--text);
    font-family: var(--font-mono);
    font-weight: 700;
}

.brand-mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    overflow: hidden;
    border: 1px solid rgba(142, 215, 255, 0.28);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.035);
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.04);
}

.brand-mark img {
    width: 100%;
    height: 100%;
    border-radius: 7px;
    object-fit: contain;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 1rem;
    color: var(--muted);
    font-size: 0.96rem;
}

.nav-links a {
    border-radius: var(--radius);
    padding: 0.48rem 0.72rem;
    transition: background 160ms ease, color 160ms ease;
}

.nav-links a:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text);
}

.nav-links .nav-action {
    border: 1px solid var(--line);
    color: var(--text);
}

.hero {
    display: grid;
    grid-template-columns: minmax(0, 0.95fr) minmax(360px, 1.05fr);
    align-items: center;
    gap: 4rem;
    min-height: 720px;
    padding: 96px 0 88px;
}

.hero-copy {
    max-width: 650px;
}

.eyebrow {
    margin: 0 0 1rem;
    color: var(--accent);
    font-family: var(--font-mono);
    font-size: 0.9rem;
    font-weight: 700;
}

.hero h1,
.section-heading h2,
.sentinel-copy h2 {
    margin: 0;
    color: var(--text);
    line-height: 1.08;
    font-weight: 760;
}

.hero h1 {
    max-width: 760px;
    font-size: 4rem;
}

.hero-subtitle {
    max-width: 610px;
    margin: 1.35rem 0 0;
    color: var(--muted);
    font-size: 1.13rem;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.85rem;
    margin-top: 2.1rem;
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 46px;
    border-radius: var(--radius);
    padding: 0.78rem 1.1rem;
    font-weight: 700;
    transition: transform 160ms ease, border-color 160ms ease, background 160ms ease;
}

.button:hover {
    transform: translateY(-1px);
}

.button-primary {
    border: 1px solid rgba(142, 215, 255, 0.54);
    background: #e0f5ff;
    color: #10181c;
}

.button-secondary {
    border: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.04);
    color: var(--text);
}

.signal-row {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.8rem;
    margin-top: 2.5rem;
}

.signal-row div {
    min-height: 90px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: rgba(255, 255, 255, 0.035);
    padding: 1rem;
}

.signal-row strong,
.signal-row span {
    display: block;
}

.signal-row strong {
    color: var(--text);
    font-family: var(--font-mono);
    font-size: 1.12rem;
}

.signal-row span {
    margin-top: 0.18rem;
    color: var(--quiet);
    font-size: 0.92rem;
}

.hero-visual {
    position: relative;
    min-height: 560px;
    overflow: hidden;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.045), transparent 28%),
        linear-gradient(135deg, rgba(142, 215, 255, 0.1), transparent 42%),
        linear-gradient(225deg, rgba(229, 192, 111, 0.08), transparent 36%),
        var(--surface);
    box-shadow: 0 24px 80px var(--shadow);
}

.hero-visual::after {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    background:
        linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px),
        linear-gradient(180deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px),
        linear-gradient(180deg, transparent 30%, rgba(16, 16, 15, 0.38));
    background-size: 58px 58px, 58px 58px, auto;
}

.phone-scene {
    position: absolute;
    inset: 24px;
    z-index: 2;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    pointer-events: none;
}

.phone-device {
    position: relative;
    width: min(336px, 82%);
    min-height: 500px;
    border: 1px solid rgba(225, 231, 230, 0.2);
    border-radius: 8px;
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.09), transparent 15%),
        linear-gradient(145deg, rgba(142, 215, 255, 0.08), transparent 42%),
        rgba(16, 16, 15, 0.9);
    box-shadow:
        0 34px 80px rgba(0, 0, 0, 0.46),
        0 0 0 8px rgba(255, 255, 255, 0.025);
    backdrop-filter: blur(18px);
    padding: 0.95rem;
    pointer-events: auto;
}

.phone-device::before {
    content: "";
    position: absolute;
    inset: 8px;
    border: 1px solid rgba(225, 231, 230, 0.075);
    border-radius: 8px;
    pointer-events: none;
    z-index: 0;
}

.phone-device > * {
    position: relative;
    z-index: 1;
}

.phone-speaker {
    width: 72px;
    height: 4px;
    border-radius: 4px;
    margin: 0 auto 0.85rem;
    background: rgba(225, 231, 230, 0.22);
}

.chat-app-header {
    display: flex;
    align-items: center;
    gap: 0.72rem;
    border-bottom: 1px solid rgba(225, 231, 230, 0.12);
    padding: 0.15rem 0 0.9rem;
}

.chat-app-header strong,
.chat-app-header span {
    display: block;
}

.chat-app-header strong {
    color: var(--text);
    line-height: 1.1;
}

.chat-app-header span {
    color: var(--muted);
    font-size: 0.82rem;
}

.chat-feed {
    display: flex;
    flex-direction: column;
    gap: 0.68rem;
    min-height: 310px;
    padding: 1.05rem 0 0.82rem;
}

.chat-bubble {
    max-width: 82%;
    border: 1px solid rgba(225, 231, 230, 0.12);
    border-radius: 8px;
    color: var(--text);
    font-size: 0.9rem;
    line-height: 1.48;
    padding: 0.7rem 0.82rem;
    box-shadow: 0 12px 28px rgba(0, 0, 0, 0.18);
    white-space: pre-wrap;
}

.chat-bubble.me {
    align-self: flex-end;
    border-color: rgba(142, 215, 255, 0.28);
    background: linear-gradient(180deg, rgba(142, 215, 255, 0.18), rgba(142, 215, 255, 0.1));
}

.chat-bubble.bot {
    align-self: flex-start;
    background: rgba(255, 255, 255, 0.052);
    color: var(--muted);
}

.chat-bubble.alert {
    align-self: flex-start;
    border-color: rgba(237, 200, 121, 0.3);
    background:
        linear-gradient(180deg, rgba(237, 200, 121, 0.14), rgba(237, 200, 121, 0.075)),
        rgba(255, 255, 255, 0.035);
    color: #f5dca4;
    font-family: var(--font-mono);
    font-size: 0.82rem;
}

.chat-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.48rem;
    margin-top: 0.15rem;
}

.chat-actions button,
.chat-compose button {
    border: 1px solid rgba(142, 215, 255, 0.36);
    border-radius: 8px;
    background: rgba(142, 215, 255, 0.14);
    color: var(--accent);
    font: inherit;
    font-size: 0.78rem;
    padding: 0.42rem 0.56rem;
}

.chat-compose {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 0.55rem;
    align-items: center;
    border: 1px solid rgba(225, 231, 230, 0.12);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.045);
    color: var(--quiet);
    font-size: 0.84rem;
    padding: 0.55rem;
}

.chat-compose span {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.phone-signal {
    position: absolute;
    right: max(0px, calc(50% - 238px));
    top: 82px;
    width: 148px;
    border: 1px solid rgba(237, 200, 121, 0.28);
    border-radius: 8px;
    background: rgba(24, 24, 22, 0.82);
    color: var(--amber);
    padding: 0.72rem 0.78rem;
    box-shadow: 0 18px 42px rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(16px);
}

.phone-signal strong,
.phone-signal span {
    display: block;
}

.phone-signal strong {
    font-family: var(--font-mono);
    font-size: 0.78rem;
}

.phone-signal span {
    margin-top: 0.16rem;
    color: var(--muted);
    font-size: 0.78rem;
}

.cursor {
    display: inline-block;
    color: var(--accent);
    animation: caretBlink 1s steps(1, end) infinite;
}

@keyframes caretBlink {
    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0;
    }
}

.section {
    padding: 88px 0;
}

.section-heading {
    max-width: 700px;
    margin-bottom: 2rem;
}

.section-heading h2,
.sentinel-copy h2 {
    font-size: 2.55rem;
}

.section-heading p:not(.eyebrow),
.sentinel-copy p:not(.eyebrow) {
    margin: 1rem 0 0;
    color: var(--muted);
    font-size: 1.05rem;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem;
}

.flip-card {
    min-height: 260px;
}

.flip-card {
    outline: none;
    perspective: 1200px;
}

.flip-card:focus-visible .flip-face {
    box-shadow: 0 0 0 2px rgba(142, 215, 255, 0.34);
}

.flip-card-inner {
    position: relative;
    min-height: 260px;
    transform-style: preserve-3d;
    transition: transform 620ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.flip-card:hover .flip-card-inner,
.flip-card:focus .flip-card-inner {
    transform: rotateY(180deg);
}

.flip-face {
    position: absolute;
    inset: 0;
    overflow: hidden;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: rgba(27, 27, 25, 0.74);
    padding: 1.35rem;
    backface-visibility: hidden;
    transition: border-color 180ms ease, background 180ms ease;
}

.flip-front::after,
.flip-back::after {
    content: "";
    position: absolute;
    left: 1.35rem;
    right: 1.35rem;
    bottom: 1.25rem;
    height: 1px;
    background: linear-gradient(90deg, rgba(142, 215, 255, 0.45), transparent);
}

.flip-back {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transform: rotateY(180deg);
    background: rgba(35, 35, 31, 0.94);
}

.flip-card:hover .flip-face,
.flip-card:focus .flip-face,
.pipeline-item:hover {
    border-color: var(--line-strong);
    background: rgba(35, 35, 31, 0.88);
}

.card-kicker,
.pipeline-item span {
    color: var(--amber);
    font-family: var(--font-mono);
    font-size: 0.86rem;
    font-weight: 700;
}

.flip-face h3 {
    margin: 3.2rem 0 0.8rem;
    font-size: 1.35rem;
}

.flip-face p,
.pipeline-item p {
    margin: 0;
    color: var(--muted);
}

.flip-back p {
    color: var(--text);
}

.flip-hint {
    position: absolute;
    left: 1.35rem;
    bottom: 1.52rem;
    color: var(--quiet);
    font-family: var(--font-mono);
    font-size: 0.78rem;
}

.pipeline-item {
    transition: border-color 180ms ease, transform 180ms ease, background 180ms ease;
}

.pipeline-item:hover {
    transform: translateY(-2px);
}

.sentinel-section {
    display: grid;
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
    gap: 3rem;
    align-items: start;
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    padding: 88px 0;
}

.sentinel-copy {
    position: sticky;
    top: 108px;
}

.pipeline {
    display: grid;
    gap: 0.9rem;
}

.pipeline-item {
    display: grid;
    grid-template-columns: 120px minmax(0, 1fr);
    gap: 1rem;
    align-items: start;
    min-height: 98px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: rgba(255, 255, 255, 0.035);
    padding: 1.1rem;
    transition: border-color 180ms ease, transform 180ms ease, background 180ms ease;
}

.site-footer {
    border-top: 1px solid var(--line);
    background: rgba(12, 12, 11, 0.72);
    padding: 36px 0 28px;
}

.footer-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    color: var(--muted);
}

.footer-inner .brand {
    color: var(--text);
}

.footer-inner p {
    margin: 0;
}

.footer-inner a:last-child {
    color: var(--accent);
    font-family: var(--font-mono);
    font-size: 0.92rem;
}

.copyright {
    margin-top: 1.6rem;
    color: var(--quiet);
    font-family: var(--font-mono);
    font-size: 0.82rem;
}

.reveal {
    opacity: 0;
    transform: translateY(18px);
}

.reveal.is-visible {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 520ms ease, transform 520ms ease;
}

@media (max-width: 980px) {
    .hero {
        grid-template-columns: 1fr;
        min-height: auto;
        gap: 2.6rem;
        padding-top: 76px;
    }

    .hero h1 {
        font-size: 3rem;
    }

    .hero-visual {
        min-height: 520px;
    }

    .feature-grid,
    .sentinel-section {
        grid-template-columns: 1fr;
    }

    .sentinel-copy {
        position: static;
    }
}

@media (max-width: 680px) {
    .nav-shell,
    .hero,
    .section,
    .sentinel-section,
    .footer-inner,
    .copyright {
        width: min(var(--max-width), calc(100% - 28px));
    }

    .nav-shell {
        min-height: 66px;
    }

    .nav-links {
        gap: 0.25rem;
        font-size: 0.9rem;
    }

    .nav-links a:not(.nav-action) {
        display: none;
    }

    .hero {
        padding: 54px 0 66px;
    }

    .hero h1 {
        font-size: 2.35rem;
    }

    .hero-subtitle,
    .section-heading p:not(.eyebrow),
    .sentinel-copy p:not(.eyebrow) {
        font-size: 1rem;
    }

    .hero-actions,
    .signal-row,
    .footer-inner {
        grid-template-columns: 1fr;
    }

    .button {
        width: 100%;
    }

    .signal-row {
        display: grid;
    }

    .hero-visual {
        min-height: 500px;
    }

    .phone-scene {
        inset: 12px;
    }

    .phone-device {
        width: min(340px, 92%);
        min-height: 480px;
    }

    .phone-signal {
        right: 8px;
        top: 52px;
        width: 150px;
    }

    .chat-feed {
        min-height: 290px;
    }

    .section {
        padding: 64px 0;
    }

    .section-heading h2,
    .sentinel-copy h2 {
        font-size: 2rem;
    }

    .flip-card {
        min-height: auto;
    }

    .flip-face h3 {
        margin-top: 2rem;
    }

    .sentinel-section {
        padding: 64px 0;
    }

    .pipeline-item {
        grid-template-columns: 1fr;
        min-height: auto;
    }

    .footer-inner {
        align-items: flex-start;
        display: grid;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 1ms !important;
        scroll-behavior: auto !important;
        transition-duration: 1ms !important;
    }

    .button:hover,
    .flip-card:hover .flip-card-inner,
    .pipeline-item:hover {
        transform: none;
    }
}

@media (hover: none) {
    .flip-card {
        min-height: auto;
    }

    .flip-card-inner,
    .flip-card:hover .flip-card-inner,
    .flip-card:focus .flip-card-inner {
        display: grid;
        gap: 0.85rem;
        min-height: auto;
        transform: none;
    }

    .flip-face {
        position: relative;
        min-height: auto;
        backface-visibility: visible;
    }

    .flip-back {
        transform: none;
    }

    .flip-hint {
        display: none;
    }
}