:root {
    --bg: #040814;
    --panel: rgba(8, 16, 31, 0.88);
    --panel-strong: rgba(13, 27, 50, 0.94);
    --line: rgba(214, 226, 255, 0.14);
    --text: #f4f8ff;
    --muted: #a8b7d4;
    --accent: #60a5fa;
    --sun: #ffd166;
    --good: #75e4a4;
}

* {
    box-sizing: border-box;
}

html,
body {
    width: 100%;
    min-height: 100%;
    margin: 0;
}

body {
    background: radial-gradient(circle at 22% 18%, #172c52 0, transparent 28%), linear-gradient(180deg, #040814 0%, #07111f 100%);
    color: var(--text);
    font-family: Arial, Helvetica, sans-serif;
}

button,
select {
    font: inherit;
}

.daynight-shell {
    min-height: 100vh;
    display: grid;
    grid-template-columns: minmax(0, 1fr) 360px;
    gap: 18px;
    padding: 18px;
}

.viewer-panel,
.control-panel {
    min-width: 0;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: var(--panel);
    box-shadow: 0 24px 70px rgba(0, 0, 0, 0.36);
}

.viewer-panel {
    position: relative;
    overflow: hidden;
    min-height: calc(100vh - 36px);
    background: #020611;
}

#daynight-canvas {
    width: 100%;
    height: 100%;
    min-height: calc(100vh - 36px);
    display: block;
}

#label-layer {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.scene-label {
    position: absolute;
    transform: translate(-50%, -50%);
    padding: 5px 8px;
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: 999px;
    background: rgba(5, 12, 25, 0.74);
    color: #fff;
    font-size: 13px;
    font-weight: 700;
    white-space: nowrap;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
}

.observer-window {
    position: absolute;
    top: 16px;
    left: 16px;
    width: min(360px, calc(100% - 32px));
    padding: 12px;
    border: 1px solid rgba(214, 226, 255, 0.18);
    border-radius: 16px;
    background: rgba(5, 12, 25, 0.74);
    box-shadow: 0 18px 42px rgba(0, 0, 0, 0.32);
    backdrop-filter: blur(10px);
}

.observer-window-head {
    display: flex;
    justify-content: space-between;
    gap: 10px;
    align-items: center;
    margin-bottom: 8px;
    color: var(--muted);
    font-size: 0.82rem;
}

.observer-window-head strong {
    color: var(--text);
}

.observer-sky {
    position: relative;
    height: 112px;
    overflow: hidden;
    border-radius: 12px;
    background: linear-gradient(180deg, #163e78 0%, #7fb7df 64%, #22334c 65%, #142034 100%);
    transition: background 0.25s ease;
}

.observer-sky.is-night {
    background: linear-gradient(180deg, #071125 0%, #182a49 64%, #101b2f 65%, #08111f 100%);
}

.observer-sky.is-twilight {
    background: linear-gradient(180deg, #24315f 0%, #e18f63 64%, #263245 65%, #111d30 100%);
}

.observer-horizon {
    position: absolute;
    left: 0;
    right: 0;
    top: 64%;
    height: 2px;
    background: rgba(255, 255, 255, 0.52);
}

.observer-directions {
    position: absolute;
    left: 50%;
    top: calc(64% + 8px);
    display: grid;
    grid-template-columns: repeat(24, 48px);
    width: 1152px;
    color: rgba(244, 248, 255, 0.78);
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0.04em;
    text-align: center;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.75);
    will-change: transform;
}

.observer-directions span {
    display: block;
}

.observer-sun {
    position: absolute;
    width: 24px;
    height: 24px;
    margin: -12px 0 0 -12px;
    border-radius: 999px;
    background: #ffd166;
    box-shadow: 0 0 28px rgba(255, 209, 102, 0.78);
    left: 50%;
    top: 34%;
    transition: left 0.12s linear, top 0.12s linear, opacity 0.15s ease;
}

.observer-window p {
    margin: 8px 0 0;
    color: var(--muted);
    font-size: 0.86rem;
}

.control-panel {
    display: flex;
    flex-direction: column;
    gap: 16px;
    padding: 18px;
    background: var(--panel-strong);
}

.panel-header h1,
.panel-block h2 {
    margin: 0;
}

.panel-header h1 {
    font-size: clamp(1.55rem, 3vw, 2.1rem);
    line-height: 1.1;
}

.panel-header p,
.panel-block p {
    color: var(--muted);
    line-height: 1.55;
}

.eyebrow {
    margin: 0 0 8px;
    color: var(--sun);
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0.08em;
}

.panel-block {
    display: grid;
    gap: 12px;
    padding: 14px;
    border: 1px solid rgba(214, 226, 255, 0.1);
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.035);
}

.segmented,
.button-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

.segmented button,
.button-row button,
select {
    min-height: 40px;
    border: 1px solid rgba(214, 226, 255, 0.18);
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.06);
    color: var(--text);
}

.segmented button,
.button-row button {
    cursor: pointer;
}

.segmented button.active {
    border-color: rgba(117, 228, 164, 0.68);
    background: rgba(117, 228, 164, 0.14);
    color: #eafff1;
}

select {
    width: 100%;
    padding: 0 10px;
    background: #0d1b32;
    color: var(--text);
    color-scheme: dark;
}

select option {
    background: #0d1b32;
    color: var(--text);
}

label {
    color: var(--muted);
    font-size: 0.92rem;
    font-weight: 700;
}

.toggle {
    display: flex;
    align-items: center;
    gap: 9px;
    font-weight: 600;
}

.toggle input {
    width: 18px;
    height: 18px;
}

.legend {
    display: grid;
    gap: 8px;
    margin: 0;
    padding: 0;
    list-style: none;
    color: var(--muted);
}

.legend li {
    display: flex;
    align-items: center;
    gap: 9px;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 999px;
    display: inline-block;
}

.dot.day {
    background: #facc15;
}

.dot.night {
    background: #2f4a78;
}

.dot.place {
    background: var(--good);
}

.fallback {
    position: absolute;
    inset: 18px;
    display: grid;
    place-items: center;
    padding: 22px;
    border-radius: 14px;
    background: rgba(8, 16, 31, 0.92);
    color: #fff;
    text-align: center;
}

.fallback[hidden] {
    display: none;
}

@media (max-width: 1050px) {
    .daynight-shell {
        grid-template-columns: 1fr;
    }

    .viewer-panel,
    #daynight-canvas {
        min-height: 66vh;
    }
}

@media (max-width: 640px) {
    .daynight-shell {
        padding: 10px;
    }

    .segmented,
    .button-row {
        grid-template-columns: 1fr;
    }
}