:root {
    --bg: #070b12;
    --surface: rgba(15, 23, 35, 0.74);
    --surface-strong: rgba(18, 28, 42, 0.9);
    --surface-soft: rgba(255, 255, 255, 0.07);
    --line: rgba(255, 255, 255, 0.14);
    --line-strong: rgba(255, 255, 255, 0.24);
    --text: #f4f7fb;
    --muted: #9aa8b8;
    --cyan: #45c9ff;
    --green: #3dd598;
    --amber: #f4bd4f;
    --red: #ff657a;
    --violet: #9d8cff;
    --shadow: 0 26px 80px rgba(0, 0, 0, 0.38), inset 0 1px 0 rgba(255, 255, 255, 0.14);
    --radius: 8px;
    --font-ui: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}

:root[data-theme="light"] {
    --bg: #f4f8fb;
    --surface: rgba(255, 255, 255, 0.72);
    --surface-strong: rgba(255, 255, 255, 0.9);
    --surface-soft: rgba(15, 23, 42, 0.06);
    --line: rgba(15, 23, 42, 0.13);
    --line-strong: rgba(15, 23, 42, 0.22);
    --text: #111827;
    --muted: #64748b;
    --cyan: #0284c7;
    --green: #059669;
    --amber: #b7791f;
    --red: #e11d48;
    --violet: #6d5dfc;
    --shadow: 0 26px 74px rgba(15, 23, 42, 0.14), inset 0 1px 0 rgba(255, 255, 255, 0.75);
}

* {
    box-sizing: border-box;
}

html {
    min-height: 100%;
    background: var(--bg);
}

body {
    min-height: 100vh;
    margin: 0;
    color: var(--text);
    font-family: var(--font-ui);
    background:
        linear-gradient(115deg, rgba(69, 201, 255, 0.16) 0%, transparent 28%),
        linear-gradient(245deg, rgba(61, 213, 152, 0.11) 0%, transparent 34%),
        linear-gradient(180deg, rgba(255, 255, 255, 0.05), transparent 22rem),
        linear-gradient(135deg, #05070c 0%, #101a28 52%, #071210 100%);
    background-attachment: fixed;
    overflow-x: hidden;
}

:root[data-theme="light"] body {
    background:
        linear-gradient(115deg, rgba(2, 132, 199, 0.14) 0%, transparent 32%),
        linear-gradient(245deg, rgba(5, 150, 105, 0.12) 0%, transparent 38%),
        linear-gradient(180deg, rgba(255, 255, 255, 0.78), transparent 22rem),
        linear-gradient(135deg, #f8fafc 0%, #eaf5f7 48%, #f6f3fb 100%);
}

body::before {
    content: "";
    position: fixed;
    inset: -15% -8%;
    z-index: -1;
    pointer-events: none;
    background:
        repeating-linear-gradient(108deg, transparent 0 8rem, rgba(255, 255, 255, 0.045) 8rem 8.12rem, transparent 8.12rem 16rem),
        linear-gradient(90deg, rgba(69, 201, 255, 0.11), rgba(244, 189, 79, 0.06), rgba(157, 140, 255, 0.08));
    filter: blur(26px);
    opacity: 0.86;
}

button,
input,
select {
    font: inherit;
}

button {
    color: inherit;
}

.sat-shell {
    width: min(1780px, calc(100% - 28px));
    margin: 0 auto;
    padding: 16px 0 34px;
}

.sat-topbar,
.viewer-panel,
.control-panel,
.panel-section {
    border: 1px solid var(--line);
    background:
        linear-gradient(145deg, rgba(255, 255, 255, 0.14), transparent 42%),
        linear-gradient(180deg, var(--surface), rgba(8, 12, 18, 0.52));
    box-shadow: var(--shadow);
    backdrop-filter: blur(24px) saturate(145%);
    -webkit-backdrop-filter: blur(24px) saturate(145%);
    border-radius: var(--radius);
}

:root[data-theme="light"] .sat-topbar,
:root[data-theme="light"] .viewer-panel,
:root[data-theme="light"] .control-panel,
:root[data-theme="light"] .panel-section {
    background:
        linear-gradient(145deg, rgba(255, 255, 255, 0.72), transparent 42%),
        linear-gradient(180deg, var(--surface), rgba(255, 255, 255, 0.62));
}

.sat-topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    min-height: 70px;
    padding: 12px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    color: inherit;
    text-decoration: none;
}

.brand-mark {
    display: grid;
    place-items: center;
    width: 46px;
    height: 46px;
    border: 1px solid var(--line-strong);
    border-radius: var(--radius);
    background: linear-gradient(135deg, rgba(69, 201, 255, 0.26), rgba(61, 213, 152, 0.16));
    color: var(--cyan);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.18);
}

.brand strong {
    display: block;
    font-size: 1.35rem;
    letter-spacing: 0;
}

.eyebrow {
    margin: 0 0 4px;
    color: var(--muted);
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0;
    text-transform: uppercase;
}

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

.status-pill,
.icon-button,
.transport-button,
.mode-tab,
.text-button {
    min-height: 38px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--surface-soft);
    color: var(--text);
}

.status-pill {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 0 11px;
    color: var(--muted);
    font-family: var(--font-mono);
    font-size: 0.82rem;
}

.status-pill i {
    color: var(--green);
}

.icon-button,
.transport-button,
.mode-tab,
.text-button {
    cursor: pointer;
    transition: border-color 160ms ease, transform 160ms ease, background 160ms ease;
}

.icon-button {
    width: 38px;
}

.icon-button:hover,
.transport-button:hover,
.mode-tab:hover,
.text-button:hover {
    border-color: var(--line-strong);
    background: rgba(255, 255, 255, 0.12);
}

.icon-button:active,
.transport-button:active,
.mode-tab:active,
.text-button:active {
    transform: translateY(1px);
}

.workspace {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 360px;
    gap: 14px;
    margin-top: 14px;
}

.viewer-panel {
    min-width: 0;
    padding: 14px;
}

.viewer-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 12px;
}

.viewer-head h1 {
    margin: 0;
    font-size: clamp(1.35rem, 2vw, 2.2rem);
    letter-spacing: 0;
}

.mode-tabs {
    display: grid;
    grid-template-columns: repeat(4, minmax(58px, 1fr));
    gap: 6px;
    width: min(360px, 100%);
}

.mode-tab {
    padding: 0 10px;
    font-family: var(--font-mono);
    font-size: 0.76rem;
    font-weight: 800;
}

.mode-tab.is-active {
    border-color: rgba(69, 201, 255, 0.6);
    background: linear-gradient(135deg, rgba(69, 201, 255, 0.24), rgba(61, 213, 152, 0.14));
    color: var(--text);
}

.image-stage {
    position: relative;
    display: grid;
    place-items: center;
    min-height: min(66vh, 840px);
    overflow: auto;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background:
        linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px),
        linear-gradient(0deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px),
        #05070c;
    background-size: 44px 44px;
}

:root[data-theme="light"] .image-stage {
    background:
        linear-gradient(90deg, rgba(15, 23, 42, 0.06) 1px, transparent 1px),
        linear-gradient(0deg, rgba(15, 23, 42, 0.06) 1px, transparent 1px),
        #edf3f7;
    background-size: 44px 44px;
}

#satImage,
#deltaCanvas {
    display: block;
    max-width: var(--image-scale, 100%);
    width: var(--image-scale, 100%);
    height: auto;
    border-radius: 4px;
    box-shadow: 0 22px 60px rgba(0, 0, 0, 0.32);
}

#satImage.filter-boost {
    filter: contrast(1.24) saturate(1.28) brightness(1.04);
}

#satImage.filter-mono {
    filter: grayscale(1) contrast(1.32) brightness(1.06);
}

#satImage.is-hidden,
#deltaCanvas.is-hidden,
.empty-layer.is-hidden {
    display: none;
}

.reticle {
    position: absolute;
    inset: 0;
    pointer-events: none;
    background:
        linear-gradient(90deg, transparent calc(50% - 0.5px), rgba(69, 201, 255, 0.22) 50%, transparent calc(50% + 0.5px)),
        linear-gradient(0deg, transparent calc(50% - 0.5px), rgba(69, 201, 255, 0.18) 50%, transparent calc(50% + 0.5px));
    opacity: 0.42;
}

.empty-layer {
    display: grid;
    place-items: center;
    gap: 8px;
    min-height: 280px;
    color: var(--muted);
    text-align: center;
}

.empty-layer i {
    color: var(--amber);
    font-size: 2rem;
}

.timeline-panel {
    margin-top: 12px;
}

#frameSlider,
#zoomRange {
    width: 100%;
    accent-color: var(--cyan);
}

.timeline-meta {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    margin-top: 6px;
    color: var(--muted);
    font-family: var(--font-mono);
    font-size: 0.78rem;
}

.control-panel {
    align-self: start;
    display: grid;
    gap: 10px;
    padding: 10px;
}

.panel-section {
    padding: 10px;
}

.transport {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
}

.transport-button {
    display: grid;
    place-items: center;
    min-height: 46px;
    font-size: 1rem;
}

.transport-button.primary {
    border-color: rgba(61, 213, 152, 0.62);
    background: linear-gradient(135deg, rgba(61, 213, 152, 0.25), rgba(69, 201, 255, 0.16));
    color: var(--green);
}

.compact-grid {
    display: grid;
    gap: 10px;
}

.compact-grid label {
    display: grid;
    gap: 7px;
    color: var(--muted);
    font-size: 0.82rem;
    font-weight: 700;
}

select {
    min-height: 38px;
    width: 100%;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--surface-strong);
    color: var(--text);
    padding: 0 10px;
}

.metric-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
}

.metric {
    min-height: 70px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--surface-soft);
    padding: 10px;
}

.metric span {
    display: block;
    color: var(--muted);
    font-size: 0.75rem;
    font-weight: 800;
    text-transform: uppercase;
}

.metric strong {
    display: block;
    margin-top: 8px;
    font-family: var(--font-mono);
    font-size: 1.05rem;
}

.strip-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    margin-bottom: 8px;
    font-weight: 800;
}

.text-button {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 0 10px;
    color: var(--muted);
    font-size: 0.82rem;
}

.frame-strip {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
    max-height: 42vh;
    overflow: auto;
    padding-right: 2px;
}

.frame-tile {
    position: relative;
    overflow: hidden;
    min-height: 86px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: #060a11;
    cursor: pointer;
}

.frame-tile img {
    display: block;
    width: 100%;
    height: 92px;
    object-fit: cover;
    opacity: 0.84;
}

.frame-tile span {
    position: absolute;
    left: 6px;
    bottom: 6px;
    border-radius: 4px;
    background: rgba(0, 0, 0, 0.58);
    color: #fff;
    padding: 3px 5px;
    font-family: var(--font-mono);
    font-size: 0.68rem;
}

.frame-tile.is-active {
    border-color: var(--cyan);
    box-shadow: 0 0 0 2px rgba(69, 201, 255, 0.2);
}

@media (max-width: 1100px) {
    .workspace {
        grid-template-columns: 1fr;
    }

    .control-panel {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .control-panel .panel-section:last-child {
        grid-column: 1 / -1;
    }

    .frame-strip {
        grid-template-columns: repeat(4, 1fr);
        max-height: none;
    }
}

@media (max-width: 720px) {
    .sat-shell {
        width: min(100% - 16px, 1780px);
        padding-top: 8px;
    }

    .sat-topbar,
    .viewer-head {
        align-items: stretch;
        flex-direction: column;
    }

    .status-row {
        justify-content: flex-start;
    }

    .control-panel {
        grid-template-columns: 1fr;
    }

    .mode-tabs {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        width: 100%;
    }

    .image-stage {
        min-height: 54vh;
    }

    .frame-strip {
        grid-template-columns: repeat(2, 1fr);
    }
}