:root {
    --crab-ink: #102116;
    --crab-green-900: #173d22;
    --crab-green-700: #285f35;
    --crab-green-500: #5c8f4b;
    --crab-green-200: #dce8d2;
    --crab-shell-700: #705333;
    --crab-shell-500: #9a7447;
    --crab-shell-200: #efe2c7;
    --crab-paper: #fbfaf3;
    --crab-white: #ffffff;
    --crab-danger: #b23a2f;
    --shadow-soft: 0 18px 45px rgba(16, 33, 22, 0.12);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: var(--crab-paper);
    color: var(--crab-ink);
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

a {
    color: var(--crab-green-700);
}

.app-shell {
    min-height: 100vh;
}

.site-nav {
    background: var(--crab-white);
    border-bottom: 3px solid var(--crab-green-900);
}

.nav-inner {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
    min-height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.brand {
    color: var(--crab-green-900);
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 1.15rem;
    font-weight: 800;
    text-decoration: none;
}

.brand img {
    width: 38px;
    height: auto;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.nav-toggle {
    align-items: center;
    background: var(--crab-white);
    border: 2px solid var(--crab-green-900);
    border-radius: 7px;
    cursor: pointer;
    display: none;
    height: 42px;
    justify-content: center;
    width: 46px;
}

.nav-toggle-bars,
.nav-toggle-bars::before,
.nav-toggle-bars::after {
    background: var(--crab-green-900);
    border-radius: 999px;
    content: "";
    display: block;
    height: 3px;
    position: relative;
    width: 22px;
}

.nav-toggle-bars::before {
    position: absolute;
    top: -7px;
}

.nav-toggle-bars::after {
    position: absolute;
    top: 7px;
}

.sr-only {
    height: 1px;
    margin: -1px;
    overflow: hidden;
    padding: 0;
    position: absolute;
    width: 1px;
    clip: rect(0, 0, 0, 0);
}

.nav-links a,
.button {
    border: 2px solid var(--crab-green-900);
    border-radius: 7px;
    color: var(--crab-green-900);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-weight: 800;
    min-height: 42px;
    padding: 9px 14px;
    text-decoration: none;
    background: var(--crab-white);
    cursor: pointer;
}

.nav-links a:hover,
.button:hover {
    background: var(--crab-green-200);
}

.button.primary {
    background: var(--crab-green-900);
    color: var(--crab-white);
}

.button.primary:hover {
    background: var(--crab-green-700);
}

.button.shell {
    border-color: var(--crab-shell-700);
    color: var(--crab-shell-700);
}

.hero {
    background: linear-gradient(135deg, var(--crab-green-900), var(--crab-green-700));
    color: var(--crab-white);
}

.hero-section {
    background: linear-gradient(135deg, var(--crab-green-900), var(--crab-green-700));
    color: var(--crab-white);
}

.hero-inner,
.content {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
}

.hero-inner {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 240px;
    gap: 34px;
    align-items: center;
    padding: 54px 0;
}

.hero h1 {
    font-size: clamp(2.1rem, 4vw, 4rem);
    line-height: 1.02;
    margin: 0 0 18px;
}

.hero p {
    font-size: 1.2rem;
    line-height: 1.45;
    margin: 0;
    max-width: 760px;
}

.hero-logo {
    width: min(210px, 100%);
    justify-self: center;
    filter: drop-shadow(0 0 0 #fff) drop-shadow(0 0 7px #fff) drop-shadow(0 0 16px rgba(255, 255, 255, 0.9));
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 26px;
}

.hero .button {
    border-color: var(--crab-white);
}

.content {
    padding: 34px 0 56px;
}

.grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
}

.panel,
.card {
    background: var(--crab-white);
    border: 2px solid var(--crab-green-900);
    border-radius: 8px;
    box-shadow: var(--shadow-soft);
}

.panel {
    padding: 24px;
}

.card {
    padding: 20px;
}

.card-link {
    color: var(--crab-ink);
    text-decoration: none;
}

.card-link:hover {
    background: var(--crab-green-200);
    color: var(--crab-ink);
}

.card h2,
.panel h2 {
    margin: 0 0 10px;
}

.card p,
.panel p {
    line-height: 1.5;
}

.muted {
    color: #4d5f51;
}

.kicker {
    color: var(--crab-shell-200);
    font-size: 0.82rem;
    font-weight: 900;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.result-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
}

.metric {
    background: var(--crab-green-200);
    border-radius: 7px;
    padding: 14px;
}

.metric-label {
    color: var(--crab-green-900);
    font-size: 0.76rem;
    font-weight: 900;
    text-transform: uppercase;
}

.metric-value {
    font-size: 1.8rem;
    font-weight: 900;
}

.upload-zone {
    align-items: center;
    background: var(--crab-white);
    border: 3px dashed var(--crab-green-700);
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    gap: 12px;
    justify-content: center;
    min-height: 230px;
    padding: 26px;
    text-align: center;
}

.upload-zone.dragover {
    background: var(--crab-green-200);
}

.preview-frame,
.video-frame {
    background: #000;
    border: 3px solid var(--crab-green-900);
    border-radius: 8px;
    overflow: hidden;
    position: relative;
}

.video-overlay {
    inset: 0;
    height: 100%;
    pointer-events: none;
    position: absolute;
    width: 100%;
}

.preview-frame img,
.video-frame video,
.video-frame img {
    display: block;
    width: 100%;
}

.status-pill,
.phase-pill {
    border-radius: 999px;
    display: inline-flex;
    font-weight: 900;
    padding: 7px 12px;
}

.status-pill {
    background: var(--crab-shell-200);
    color: var(--crab-ink);
}

.phase-pill {
    background: var(--crab-green-900);
    color: var(--crab-white);
}

.demo-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.35fr) minmax(320px, 0.65fr);
    gap: 22px;
    align-items: start;
}

.demo-compact-layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
}

.demo-video-frame {
    display: inline-block;
    justify-self: start;
    margin: 0 auto;
    height: clamp(320px, 60vh, 500px);
    max-width: 100%;
    width: fit-content;
}

.demo-video-frame video {
    height: 100%;
    object-fit: contain;
    width: auto;
}

.demo-title-row {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    align-items: center;
    margin-bottom: 14px;
}

.demo-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 14px;
}

.detect-overlay {
    border: 3px solid var(--crab-green-900);
    border-radius: 8px;
    margin-top: 14px;
    overflow: hidden;
}

.thumbnail-strip {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
    margin-top: 12px;
}

.thumbnail-strip button {
    background: transparent;
    border: 2px solid transparent;
    border-radius: 6px;
    cursor: pointer;
    padding: 0;
    overflow: hidden;
}

.thumbnail-strip button.active {
    border-color: var(--crab-shell-700);
}

.thumbnail-strip img {
    display: block;
    width: 100%;
}

.result-thumb {
    display: block;
    margin-top: 12px;
    max-width: 240px;
    width: min(100%, 240px);
}

.footer {
    border-top: 2px solid var(--crab-green-900);
    padding: 22px 0;
    text-align: center;
}

.qr-card {
    max-width: 560px;
    margin: 0 auto;
    text-align: center;
}

.qr-card img {
    width: min(360px, 90vw);
}

.guide-section {
    margin-bottom: 26px;
}

.cue-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
}

.cue-sketch {
    background: linear-gradient(180deg, #f7f7f7 0%, #d9d9d9 100%);
    border: 2px solid var(--crab-green-900);
    border-radius: 8px;
    margin: 0 auto 12px;
    display: block;
    max-width: 240px;
    width: min(100%, 240px);
}

.guide-note {
    border-left: 4px solid var(--crab-shell-700);
    color: var(--crab-ink);
    margin-top: 14px;
    padding: 12px 14px;
}

.explainability-panel {
    margin-top: 16px;
}

.explainability-list {
    margin: 10px 0 0;
    padding-left: 20px;
}

.explainability-list li + li {
    margin-top: 6px;
}

.example-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
}

.example-card img {
    aspect-ratio: 4 / 3;
    border-radius: 7px;
    display: block;
    object-fit: cover;
    width: 100%;
}

.example-card figcaption {
    font-size: 0.9rem;
    line-height: 1.35;
    margin-top: 8px;
}

@media (max-width: 820px) {
    .hero-inner,
    .demo-layout,
    .grid,
    .result-grid,
    .cue-grid,
    .example-grid {
        grid-template-columns: 1fr;
    }

    .nav-inner {
        align-items: center;
        flex-direction: row;
        flex-wrap: wrap;
        min-height: 64px;
        padding: 10px 0;
    }

    .nav-toggle {
        display: inline-flex;
        margin-left: auto;
    }

    .nav-links {
        display: none;
        flex-basis: 100%;
        flex-direction: column;
        justify-content: flex-start;
        width: 100%;
    }

    .site-nav.nav-open .nav-links {
        display: flex;
    }

    .nav-links a {
        width: 100%;
    }

    .hero-inner {
        padding: 38px 0;
    }

    .cue-sketch {
        max-width: 100%;
        width: 100%;
    }
}