/* Viewer experience: centered card, readable on any screen */
:root {
    --text: #fff;
    --panel: rgba(0, 0, 0, .5);
    --overlay: rgba(0, 0, 0, 0);
    --overlay-strong: rgba(0, 0, 0, .6);
    --space: 16px;
    /* base spacing scales at breakpoints */
    --radius: 16px;
    --tap: 48px;
    /* comfy touch target */
}

@media (prefers-color-scheme: dark) {
    :root {
        --panel: rgba(0, 0, 0, .55);
    }
}

@media (prefers-reduced-motion: reduce) {
    * {
        animation: none !important;
        transition: none !important;
    }
}

body {
    margin: 0;
    min-height: 100svh;
    /* stable mobile viewport */
    padding: max(env(safe-area-inset-top), var(--space)) max(env(safe-area-inset-right), var(--space)) max(env(safe-area-inset-bottom), var(--space)) max(env(safe-area-inset-left), var(--space));
    display: grid;
    place-items: center;
    font-family: system-ui, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
    background: linear-gradient(135deg, #1e3a8a, #9333ea);
    color: var(--text);
    text-align: center;
    position: relative;
    transition: background .6s ease;
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    background: var(--overlay);
    transition: background .3s ease;
}

.dim-strong::before {
    background: var(--overlay-strong);
}

.card {
    width: min(720px, 100%);
    max-width: 720px;
    padding: calc(var(--space) + 8px);
    border-radius: var(--radius);
    background: var(--panel);
    box-shadow: 0 12px 24px rgba(0, 0, 0, .4);
    animation: fadeIn .3s ease both;
}

h1 {
    margin: 0 0 10px;
    font-size: clamp(1.4rem, 5vw, 2rem);
}

.controls {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
    margin: 10px 0 16px;
}

select,
button {
    border: 0;
    border-radius: 10px;
    padding: .8rem 1rem;
    font-size: 1rem;
    cursor: pointer;
    min-height: var(--tap);
    /* comfortable touch */
    line-height: 1.1;
}

select {
    background: #111827;
    color: #e5e7eb;
    border: 1px solid rgba(255, 255, 255, .2);
}

button {
    background: #2563eb;
    color: #fff;
}

button:hover {
    filter: brightness(1.08);
}

#output {
    font-size: clamp(1.05rem, 3.8vw, 1.35rem);
    margin: 16px 0 0;
    min-height: 3.2em;
    opacity: 0;
    transition: opacity .3s;
}

#output.show {
    opacity: 1;
}

.hint {
    opacity: .75;
    font-size: clamp(.9rem, 2.5vw, .95rem);
    margin-top: 6px;
}

details.favs {
    margin-top: 16px;
    text-align: left;
}

.fav-actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-top: 8px;
}

.fav-actions button {
    background: #374151;
}

ul#favs {
    list-style: none;
    padding: 0;
    margin: 10px 0 0;
    display: grid;
    gap: 10px;
    max-height: min(40vh, 360px);
    overflow: auto;
    /* scroll on small screens */
}

ul#favs li {
    background: rgba(255, 255, 255, .06);
    border: 1px solid rgba(255, 255, 255, .15);
    border-radius: 10px;
    padding: 10px;
    display: grid;
    gap: 8px;
}

.fav-text {
    font-size: clamp(.95rem, 3vw, 1rem);
}

.fav-btns {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.danger {
    background: #dc2626;
}

#toast {
    position: fixed;
    left: 50%;
    bottom: 24px;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, .8);
    color: #fff;
    padding: .6rem .9rem;
    border-radius: 10px;
    opacity: 0;
    transition: opacity .25s;
    max-width: min(90vw, 420px);
    text-align: center;
}

#toast.show {
    opacity: 1;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

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

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

/* Responsive tweaks */
@media (max-width: 480px) {
    .controls {
        gap: 10px;
    }

    /* full-width controls for narrow screens */
    .controls>* {
        flex: 1 1 100%;
    }

    select,
    button {
        width: 100%;
    }
}

@media (min-width: 768px) {
    :root {
        --space: 20px;
        --radius: 18px;
    }

    .card {
        padding: calc(var(--space) + 10px);
    }
}