/* tokens */
:root {
    --bg: #0e1116;
    --fg: #e8eef7;
    --accent: #14ffec;
    --accent-2: #ff4dcd;

    --surface: color-mix(in srgb, var(--bg) 82%, white 4%);
    --line: color-mix(in srgb, var(--accent) 38%, transparent);
    --muted: color-mix(in srgb, var(--fg) 58%, transparent);
    --radius: 12px;
    color-scheme: dark;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    -webkit-text-size-adjust: 100%;
}

body {
    margin: 0;
    min-height: 100dvh;
    background: var(--bg);
    color: var(--fg);
    font: 400 1rem/1.5 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    /* Two faint neon washes instead of per-element glow: one paint, no repaint churn. */
    background-image:
        radial-gradient(60rem 40rem at 12% -10%, color-mix(in srgb, var(--accent) 12%, transparent), transparent 70%),
        radial-gradient(50rem 36rem at 92% 8%, color-mix(in srgb, var(--accent-2) 11%, transparent), transparent 70%);
    background-attachment: fixed;
}

::selection {
    background: color-mix(in srgb, var(--accent) 55%, transparent);
    color: var(--bg);
}

h1, h2, h3 {
    margin: 0;
    font-weight: 600;
    letter-spacing: 0.02em;
}

h1:focus,
h1:focus-visible {
    outline: none;
}

p {
    margin: 0;
}

a {
    color: var(--accent-2);
    text-decoration: none;
}

a:hover {
    filter: brightness(1.2);
}

.muted {
    color: var(--muted);
    font-size: 0.85rem;
}

/* controls */
.input,
select,
textarea,
input[type="text"] {
    width: 100%;
    min-width: 0;
    background: color-mix(in srgb, var(--bg) 72%, black);
    color: var(--fg);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 0.65rem 0.85rem;
    font: inherit;
    font-size: 1rem; /* keeps iOS from zooming on focus */
    outline: none;
    caret-color: var(--accent);
    transition: border-color .15s ease, box-shadow .15s ease;
}

.input:focus,
select:focus,
textarea:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 22%, transparent);
}

select {
    appearance: none;
    padding-right: 2rem;
    background-image: linear-gradient(45deg, transparent 50%, var(--accent) 50%),
                      linear-gradient(135deg, var(--accent) 50%, transparent 50%);
    background-position: right 1.05rem center, right 0.8rem center;
    background-size: 0.3rem 0.3rem, 0.3rem 0.3rem;
    background-repeat: no-repeat;
    cursor: pointer;
}

textarea {
    resize: vertical;
    line-height: 1.45;
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 0.95rem;
}

::placeholder {
    color: color-mix(in srgb, var(--fg) 42%, transparent);
}

.btn,
button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    appearance: none;
    background: transparent;
    color: var(--accent);
    border: 1.5px solid var(--accent);
    border-radius: var(--radius);
    padding: 0.65rem 1.35rem;
    font: inherit;
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    cursor: pointer;
    white-space: nowrap;
    transition: color .15s ease, background-color .15s ease, box-shadow .15s ease, opacity .15s ease;
}

.btn:hover,
button:hover {
    color: var(--bg);
    background: var(--accent);
    box-shadow: 0 0 18px color-mix(in srgb, var(--accent) 55%, transparent);
}

.btn:active,
button:active {
    transform: translateY(1px);
}

.btn:focus-visible,
button:focus-visible {
    outline: 2px solid var(--accent-2);
    outline-offset: 2px;
}

button:disabled {
    opacity: .5;
    cursor: progress;
}

button:disabled:hover {
    color: var(--accent);
    background: transparent;
    box-shadow: none;
}

.btn--ghost {
    color: var(--muted);
    border-color: color-mix(in srgb, var(--fg) 22%, transparent);
    font-weight: 500;
    letter-spacing: 0.02em;
}

.btn--ghost:hover {
    color: var(--bg);
    background: var(--fg);
    box-shadow: none;
}

.btn--go {
    width: 100%;
    padding-block: 0.85rem;
    border-color: var(--accent-2);
    color: var(--accent-2);
    text-transform: uppercase;
}

.btn--go:hover {
    background: var(--accent-2);
    box-shadow: 0 0 22px color-mix(in srgb, var(--accent-2) 55%, transparent);
}

.btn--go:disabled:hover {
    color: var(--accent-2);
    background: transparent;
}

.is-done {
    color: var(--bg) !important;
    background: var(--accent) !important;
}

/* shell */
.shell {
    width: min(46rem, 100%);
    margin-inline: auto;
    padding: 1.5rem 1rem 4rem;
}

.card {
    display: flex;
    flex-direction: column;
    gap: 1.1rem;
    background: color-mix(in srgb, var(--surface) 88%, transparent);
    border: 1px solid color-mix(in srgb, var(--accent) 20%, transparent);
    border-radius: calc(var(--radius) + 6px);
    padding: 1.4rem;
    box-shadow: 0 18px 50px rgb(0 0 0 / 45%);
}

.card__lede {
    color: var(--muted);
    font-size: 0.9rem;
}

/* segmented format switch */
.seg {
    display: grid;
    grid-auto-flow: column;
    grid-auto-columns: 1fr;
    gap: 0.35rem;
    padding: 0.3rem;
    background: color-mix(in srgb, var(--bg) 70%, black);
    border: 1px solid color-mix(in srgb, var(--accent) 18%, transparent);
    border-radius: var(--radius);
}

.seg__btn {
    flex-direction: column;
    gap: 0.15rem;
    padding: 0.55rem 0.4rem;
    border: none;
    border-radius: calc(var(--radius) - 4px);
    color: var(--muted);
    font-size: 0.85rem;
    font-weight: 500;
    letter-spacing: 0.02em;
}

.seg__btn:hover {
    color: var(--fg);
    background: color-mix(in srgb, var(--fg) 8%, transparent);
    box-shadow: none;
}

.seg__btn.is-active {
    color: var(--bg);
    background: var(--accent);
    box-shadow: 0 0 16px color-mix(in srgb, var(--accent) 45%, transparent);
}

.seg__ico {
    font-size: 1.15rem;
    line-height: 1;
}

.opts {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
}

.opt {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.opt__label {
    color: var(--muted);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.field {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.field__meta {
    display: flex;
    justify-content: space-between;
    gap: 0.75rem;
    color: var(--muted);
    font-size: 0.78rem;
}

/* file attachment */
.file {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.7rem 1rem;
    border: 1px dashed color-mix(in srgb, var(--accent) 40%, transparent);
    border-radius: var(--radius);
    color: var(--muted);
    font-size: 0.85rem;
    cursor: pointer;
    transition: border-color .15s ease, color .15s ease;
}

.file:hover {
    border-color: var(--accent);
    color: var(--fg);
}

.file__input {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}

.chip {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.85rem 1rem;
    background: color-mix(in srgb, var(--bg) 72%, black);
    border: 1px solid var(--line);
    border-radius: var(--radius);
}

.chip__name {
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.chip__size {
    color: var(--muted);
    font-size: 0.8rem;
}

.chip__x {
    padding: 0.2rem 0.6rem;
    border-color: color-mix(in srgb, var(--fg) 25%, transparent);
    color: var(--muted);
}

.err {
    padding: 0.65rem 0.9rem;
    border: 1px solid var(--accent-2);
    border-radius: var(--radius);
    background: color-mix(in srgb, var(--accent-2) 12%, transparent);
    color: var(--fg);
    font-size: 0.9rem;
}

.note {
    padding: 0.6rem 0.9rem;
    border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
    border-radius: var(--radius);
    color: var(--muted);
    font-size: 0.85rem;
}

/* result */
.result {
    display: flex;
    flex-direction: column;
    gap: 0.7rem;
    padding-top: 1.1rem;
    border-top: 1px solid color-mix(in srgb, var(--accent) 20%, transparent);
}

.result__row {
    display: flex;
    gap: 0.6rem;
    align-items: center;
}

.result__row .input {
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.result__actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
}

.result__actions .btn {
    flex: 1 1 8rem;
}

/* viewer pages */
.panel {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: stretch;
}

.panel__actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
    align-items: center;
}

.panel__actions .btn {
    flex: 1 1 9rem;
}

.empty {
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 0.9rem;
    padding: 3rem 0;
}

/* mobile */
@media (max-width: 640px) {
    .shell {
        padding: 1rem 0.75rem 3rem;
    }

    .card {
        padding: 1rem;
        border-radius: var(--radius);
    }

    .opts {
        grid-template-columns: 1fr;
    }

    .result__row {
        flex-direction: column;
        align-items: stretch;
    }

    .result__row .btn {
        width: 100%;
    }
}

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

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    margin: -1px;
    padding: 0;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
    border: 0;
}