/* ============================================================
   SURF PLANET — real NASA planetary imagery
   ============================================================ */
body[data-page-id="surf-planet"] {
    overflow: hidden;
    background: #000;
}

/* ---- Cinematic background layers (crossfade) ---- */
#sp-bg {
    position: fixed;
    inset: 0;
    z-index: 0;
    overflow: hidden;
    cursor: pointer;
}

.sp-bg-layer {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    opacity: 0;
    transition: opacity 1.2s ease;
}

.sp-bg-layer.active {
    opacity: 1;
}

/* Gradient darken for HUD/selector legibility */
#sp-bg::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(to bottom,
            rgba(0, 0, 0, 0.45) 0%,
            rgba(0, 0, 0, 0.10) 35%,
            rgba(0, 0, 0, 0.25) 65%,
            rgba(0, 0, 0, 0.70) 100%);
    z-index: 1;
    pointer-events: none;
}

/* ---- Planet selector pill bar ---- */
.sp-selector {
    position: fixed;
    top: 78px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 15;
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
    justify-content: center;
    padding: 0 16px;
}

.sp-planet-btn {
    font-family: var(--font-mono);
    font-size: 0.62rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    background: rgba(0, 0, 0, 0.55);
    border: 1px solid rgba(0, 200, 255, 0.3);
    color: rgba(0, 200, 255, 0.7);
    padding: 6px 14px;
    cursor: pointer;
    transition: background 0.15s, border-color 0.15s, color 0.15s;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.sp-planet-btn:hover {
    background: rgba(0, 200, 255, 0.12);
    color: #00c8ff;
    border-color: rgba(0, 200, 255, 0.6);
}

.sp-planet-btn.active {
    background: rgba(0, 200, 255, 0.18);
    color: #ffffff;
    border-color: rgba(0, 200, 255, 0.9);
}

.sp-planet-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

/* ---- Gallery thumbnail strip ---- */
.sp-gallery {
    position: fixed;
    bottom: 55px;
    left: 0;
    right: 0;
    z-index: 15;
    padding: 0 20px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.35s ease;
}

.sp-gallery.visible {
    opacity: 1;
    pointer-events: all;
}

.sp-gallery-inner {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding: 6px 0;
    scrollbar-width: none;
}

.sp-gallery-inner::-webkit-scrollbar {
    display: none;
}

.sp-thumb {
    flex-shrink: 0;
    width: 80px;
    height: 60px;
    cursor: pointer;
    border: 1px solid rgba(0, 200, 255, 0.2);
    overflow: hidden;
    transition: border-color 0.15s, transform 0.15s;
}

.sp-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.sp-thumb:hover {
    border-color: rgba(0, 200, 255, 0.7);
    transform: scale(1.06);
}

.sp-thumb.active {
    border-color: #00c8ff;
    border-width: 2px;
}

/* ---- Loading state ---- */
.sp-loading {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 20;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.2s;
}

.sp-loading.visible {
    opacity: 1;
}

.sp-loading-text {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 3px;
    color: rgba(0, 200, 255, 0.75);
    animation: tv-signal-blink 1.2s infinite;
}

/* ---- Error state ---- */
.sp-error {
    position: fixed;
    bottom: 130px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 20;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.2s;
    white-space: nowrap;
}

.sp-error.visible {
    opacity: 1;
}

.sp-error-text {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    letter-spacing: 2px;
    color: rgba(255, 80, 80, 0.85);
}

/* ---- Detail overlay (lightbox) ---- */
.sp-detail {
    position: fixed;
    inset: 0;
    z-index: 9000;
    background: rgba(0, 0, 0, 0.92);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease;
}

.sp-detail.active {
    opacity: 1;
    pointer-events: all;
}

.sp-detail-close {
    position: absolute;
    top: 18px;
    right: 22px;
    background: none;
    border: 1px solid rgba(0, 200, 255, 0.35);
    color: rgba(0, 200, 255, 0.8);
    font-family: var(--font-mono);
    font-size: 1rem;
    width: 36px;
    height: 36px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.15s, color 0.15s;
}

.sp-detail-close:hover {
    background: rgba(0, 200, 255, 0.12);
    color: #00c8ff;
}

.sp-detail-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(0, 0, 0, 0.5);
    border: 1px solid rgba(0, 200, 255, 0.25);
    color: rgba(0, 200, 255, 0.7);
    font-size: 2.5rem;
    width: 48px;
    height: 80px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.15s, color 0.15s;
    z-index: 10;
    line-height: 1;
}

.sp-detail-nav:hover {
    background: rgba(0, 200, 255, 0.1);
    color: #00c8ff;
}

.sp-detail-prev {
    left: 16px;
}

.sp-detail-next {
    right: 16px;
}

.sp-detail-img-wrap {
    max-width: 90vw;
    max-height: 72vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.sp-detail-img {
    max-width: 90vw;
    max-height: 72vh;
    object-fit: contain;
    display: block;
    box-shadow: 0 0 60px rgba(0, 200, 255, 0.08);
}

.sp-detail-caption {
    margin-top: 16px;
    text-align: center;
    font-family: var(--font-mono);
    max-width: 70vw;
    padding: 0 16px;
}

.sp-detail-title {
    font-size: 0.78rem;
    letter-spacing: 2px;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 6px;
}

.sp-detail-meta {
    font-size: 0.6rem;
    letter-spacing: 1.5px;
    color: rgba(0, 200, 255, 0.55);
    line-height: 1.7;
}

/* ---- Header sits above everything ---- */
.surf-header {
    position: fixed;
    left: 0;
    right: 0;
    z-index: 20;
    background: linear-gradient(to bottom, rgba(0, 0, 0, 0.55) 0%, transparent 100%);
    backdrop-filter: none;
}

/* ---- HUD overlay ---- */
.surf-hud {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 10;
    font-family: var(--font-mono);
    color: rgba(0, 200, 255, 0.85);
}

.hud-top-left {
    position: absolute;
    top: 90px;
    left: 24px;
}

.hud-top-right {
    position: absolute;
    top: 90px;
    right: 24px;
    text-align: right;
}

.hud-bottom-left {
    position: absolute;
    bottom: 58px;
    left: 24px;
}

.hud-bottom {
    position: absolute;
    bottom: 28px;
    left: 50%;
    transform: translateX(-50%);
}

.hud-label {
    font-size: 0.58rem;
    letter-spacing: 0.18em;
    opacity: 0.5;
    text-transform: uppercase;
    margin-bottom: 4px;
}

.hud-value {
    font-size: 0.82rem;
    letter-spacing: 0.08em;
}

.hud-controls {
    font-size: 0.56rem;
    letter-spacing: 0.2em;
    opacity: 0.4;
    white-space: nowrap;
}

/* Corner bracket decorations */
.hud-corner {
    position: absolute;
    width: 36px;
    height: 36px;
    border-color: rgba(0, 200, 255, 0.25);
    border-style: solid;
}

.hud-corner--tl {
    top: 70px;
    left: 16px;
    border-width: 1px 0 0 1px;
}

.hud-corner--tr {
    top: 70px;
    right: 16px;
    border-width: 1px 1px 0 0;
}

.hud-corner--bl {
    bottom: 16px;
    left: 16px;
    border-width: 0 0 1px 1px;
}

.hud-corner--br {
    bottom: 16px;
    right: 16px;
    border-width: 0 1px 1px 0;
}

@media (max-width: 600px) {

    .hud-top-left,
    .hud-top-right {
        top: 76px;
    }

    .hud-corner--tl,
    .hud-corner--tr {
        top: 58px;
    }

    .sp-selector {
        top: 64px;
        gap: 5px;
    }

    .sp-planet-btn {
        font-size: 0.56rem;
        padding: 5px 10px;
    }

    .sp-detail-nav {
        width: 36px;
        height: 60px;
        font-size: 1.8rem;
    }

    .sp-detail-caption {
        max-width: 90vw;
    }

    .sp-thumb {
        width: 64px;
        height: 48px;
    }

    .hud-bottom-left {
        bottom: 52px;
    }
}