:root {
    --bg-top: #020205;
    --bg-mid: #150b28;
    --bg-bottom: #061633;
    --wa-dots: radial-gradient(circle at 1px 1px, rgba(255, 255, 255, 0.09) 1px, rgba(0, 0, 0, 0) 1px);
    --surface: rgba(11, 11, 20, 0.92);
    --surface-strong: #151529;
    --ink: #edf0ff;
    --ink-soft: #a3abce;
    --accent: #7b5cff;
    --accent-alt: #2a4dde;
    --line: rgba(133, 116, 219, 0.34);
    --shadow: 0 22px 46px rgba(0, 0, 0, 0.48);
    --progress-track: #66697a;
    --progress-fill: #ffffff;
}

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    padding: 0;
}

body {
    min-height: 100vh;
    color: var(--ink);
    font-family: "Trebuchet MS", "Lucida Sans Unicode", "Gill Sans", sans-serif;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.06), rgba(0, 0, 0, 0.7)),
        var(--wa-dots),
        linear-gradient(#070809, #020203);
    background-size: 100% 100%, 4px 4px, 100% 100%;
    background-repeat: no-repeat, repeat, no-repeat;
    position: relative;
}

body.no-scroll {
    overflow: hidden;
}

.wa-vis {
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.06), rgba(0, 0, 0, 0.7)),
        var(--wa-dots),
        linear-gradient(#070809, #020203);
    background-size: 100% 100%, 4px 4px, 100% 100%;
    background-repeat: no-repeat, repeat, no-repeat;
}

.gallery-app {
    width: min(100%, 1100px);
    margin: 0 auto;
    padding: 0.55rem 0.8rem 1.8rem;
    position: relative;
    z-index: 1;
}

.loading-progress {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 9;
    display: flex;
    align-items: center;
    gap: 0.55rem;
    padding: 0.3rem 0.75rem;
    background: rgba(8, 9, 14, 0.92);
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
    pointer-events: none;
    opacity: 0;
    transform: translateY(-100%);
    transition: opacity 0.16s ease, transform 0.16s ease;
}

.loading-progress.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.loading-progress-track {
    flex: 1;
    height: 0.42rem;
    border-radius: 999px;
    overflow: hidden;
    background: var(--progress-track);
}

.loading-progress-bar {
    width: 0%;
    height: 100%;
    background: var(--progress-fill);
    transition: width 0.13s linear;
}

.loading-progress-text {
    min-width: 2.8rem;
    text-align: right;
    color: var(--progress-fill);
    font-size: 0.78rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
}

.notice-card {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 1rem;
    padding: 1rem;
    box-shadow: var(--shadow);
    animation: rise-in 0.55s ease both;
}

.notice-card h2 {
    margin: 0 0 0.5rem;
    font-size: 1.2rem;
    color: var(--ink);
}

.notice-card p {
    margin: 0;
    line-height: 1.45;
    color: var(--ink-soft);
}

.notice-card .small-hint {
    margin-top: 0.7rem;
    font-size: 0.92rem;
}

.notice-card code {
    background: rgba(123, 92, 255, 0.2);
    padding: 0.07rem 0.38rem;
    border-radius: 0.35rem;
    font-family: "Courier New", monospace;
    font-size: 0.92em;
    color: var(--ink);
}

.gallery-shell {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 1.15rem;
    padding: 0.65rem;
    box-shadow: var(--shadow);
    animation: rise-in 0.6s ease both;
}

.album-list,
.thumb-list {
    display: flex;
    gap: 0.5rem;
    overflow-x: auto;
    scrollbar-width: thin;
}

.album-list {
    padding: 0.15rem 0.08rem 0.52rem;
}

.thumb-list {
    padding: 0.62rem 0.08rem 0.12rem;
}

.album-list::-webkit-scrollbar,
.thumb-list::-webkit-scrollbar {
    height: 9px;
}

.album-list::-webkit-scrollbar-thumb,
.thumb-list::-webkit-scrollbar-thumb {
    background: rgba(130, 112, 210, 0.36);
    border-radius: 999px;
}

.album-btn {
    border: 1px solid rgba(136, 124, 216, 0.3);
    border-radius: 999px;
    padding: 0.44rem 0.86rem;
    background: #16162a;
    color: #dce1ff;
    font-size: 0.87rem;
    font-weight: 700;
    white-space: nowrap;
    cursor: pointer;
    transition: transform 0.22s ease, background-color 0.22s ease, color 0.22s ease;
}

.album-btn.active {
    background: linear-gradient(120deg, var(--accent-alt), var(--accent));
    color: #ffffff;
    box-shadow: 0 8px 20px rgba(66, 84, 215, 0.44);
    border-color: transparent;
}

.viewer-wrap {
    position: relative;
}

.stage {
    margin: 0;
    border-radius: 1rem;
    padding: 0.5rem;
    background: linear-gradient(180deg, #04040b 0%, #0d1027 55%, #051733 100%);
    min-height: 44vh;
    display: flex;
    flex-direction: column;
    gap: 0.62rem;
    user-select: none;
}

.stage img {
    width: 100%;
    height: min(50vh, 340px);
    object-fit: contain;
    border-radius: 0.72rem;
    background: rgba(0, 0, 0, 0.3);
    opacity: 0;
    transform: scale(0.985);
    transition: opacity 0.3s ease, transform 0.3s ease;
    cursor: zoom-in;
}

.stage img.is-ready {
    opacity: 1;
    transform: scale(1);
}

.stage-caption {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.45rem;
    font-size: 0.86rem;
    color: #d5dbff;
}

#imageTitle {
    font-weight: 700;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

#imageCounter {
    color: var(--ink-soft);
    font-variant-numeric: tabular-nums;
}

.nav-button {
    position: absolute;
    top: 43%;
    transform: translateY(-50%);
    z-index: 2;
    width: 2.25rem;
    height: 2.25rem;
    border: 0;
    border-radius: 999px;
    background: rgba(5, 7, 18, 0.76);
    color: #ffffff;
    display: grid;
    place-items: center;
    font-size: 1.5rem;
    line-height: 1;
    cursor: pointer;
    transition: background-color 0.2s ease, transform 0.2s ease;
}

.nav-button.prev {
    left: 0.42rem;
}

.nav-button.next {
    right: 0.42rem;
}

.nav-button:disabled {
    opacity: 0.45;
    cursor: default;
}

.viewer-modal {
    position: fixed;
    inset: 0;
    z-index: 20;
    background: rgba(4, 5, 10, 0.95);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease;
}

.viewer-modal.is-open {
    opacity: 1;
    visibility: visible;
}

.viewer-modal-stage {
    height: 100vh;
    margin: 0;
    padding: 3rem 0.95rem 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.8rem;
    user-select: none;
}

.viewer-modal-stage img {
    width: min(100%, 1650px);
    max-height: calc(100vh - 8rem);
    object-fit: contain;
    opacity: 0;
    transform: scale(0.99);
    transition: opacity 0.2s ease, transform 0.2s ease;
}

.viewer-modal-stage img.is-ready {
    opacity: 1;
    transform: scale(1);
}

.viewer-modal-caption {
    width: min(100%, 1650px);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.55rem;
    color: #f1f3ff;
    font-size: 0.95rem;
    padding: 0 0.2rem;
}

#viewerModalTitle {
    font-weight: 700;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

#viewerModalCounter {
    color: #c8cdef;
    font-variant-numeric: tabular-nums;
}

.viewer-modal-nav,
.viewer-modal-close {
    position: absolute;
    border: 0;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.16);
    color: #ffffff;
    display: grid;
    place-items: center;
    cursor: pointer;
    z-index: 21;
    transition: transform 0.18s ease, background-color 0.18s ease;
}

.viewer-modal-nav {
    top: 50%;
    transform: translateY(-50%);
    width: 2.8rem;
    height: 2.8rem;
    font-size: 2rem;
    line-height: 1;
}

.viewer-modal-nav.prev {
    left: 0.55rem;
}

.viewer-modal-nav.next {
    right: 0.55rem;
}

.viewer-modal-close {
    top: 0.55rem;
    right: 0.55rem;
    width: 2.5rem;
    height: 2.5rem;
    font-size: 1.8rem;
    line-height: 1;
}

.viewer-modal-nav:disabled {
    opacity: 0.45;
    cursor: default;
}

.thumb-btn {
    border: 2px solid transparent;
    border-radius: 0.72rem;
    background: transparent;
    padding: 0;
    width: 4rem;
    height: 4rem;
    flex: 0 0 auto;
    overflow: hidden;
    cursor: pointer;
    transition: transform 0.2s ease, border-color 0.2s ease;
}

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

.thumb-btn.active {
    border-color: var(--accent);
    box-shadow: 0 7px 17px rgba(123, 92, 255, 0.44);
}

.album-btn:focus-visible,
.thumb-btn:focus-visible,
.nav-button:focus-visible,
.viewer-modal-nav:focus-visible,
.viewer-modal-close:focus-visible {
    outline: 3px solid rgba(123, 92, 255, 0.52);
    outline-offset: 2px;
}

@media (hover: hover) {
    .album-btn:hover {
        transform: translateY(-1px);
    }

    .thumb-btn:hover {
        transform: translateY(-2px);
    }

    .nav-button:not(:disabled):hover {
        background: rgba(6, 9, 21, 0.95);
        transform: translateY(-50%) scale(1.04);
    }

    .viewer-modal-nav:not(:disabled):hover,
    .viewer-modal-close:hover {
        background: rgba(255, 255, 255, 0.26);
        transform: translateY(-50%) scale(1.05);
    }

    .viewer-modal-close:hover {
        transform: scale(1.05);
    }
}

@media (min-width: 760px) {
    .gallery-app {
        padding: 0.75rem 1.15rem 2rem;
    }

    .gallery-shell {
        padding: 0.85rem;
        border-radius: 1.3rem;
    }

    .stage {
        padding: 0.8rem;
        min-height: 48vh;
        border-radius: 1.1rem;
    }

    .stage img {
        height: min(54vh, 500px);
        border-radius: 0.9rem;
    }

    .thumb-btn {
        width: 4.6rem;
        height: 4.6rem;
    }

    .nav-button {
        width: 2.7rem;
        height: 2.7rem;
        font-size: 1.8rem;
    }

    .nav-button.prev {
        left: 0.72rem;
    }

    .nav-button.next {
        right: 0.72rem;
    }

    .viewer-modal-stage {
        padding: 3.3rem 1.4rem 1.1rem;
    }

    .viewer-modal-nav {
        width: 3.2rem;
        height: 3.2rem;
        font-size: 2.2rem;
    }

    .viewer-modal-nav.prev {
        left: 0.9rem;
    }

    .viewer-modal-nav.next {
        right: 0.9rem;
    }

    .viewer-modal-close {
        top: 0.9rem;
        right: 0.9rem;
        width: 2.8rem;
        height: 2.8rem;
        font-size: 2rem;
    }
}

@keyframes rise-in {
    from {
        opacity: 0;
        transform: translateY(12px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}