:root {
    --bg: #0d0f14;
    --bg-alt: #141821;
    --bg-hover: #1a1f2b;
    --text: #e8eaf0;
    --muted: #9aa3b2;
    --accent: #6c5ce7;
    --accent-2: #00d1ff;
    --danger: #ff5c7a;
    --success: #2fd48a;
    --radius: 14px;
    --border: rgba(255, 255, 255, 0.08);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

[hidden] { display: none !important; }

body {
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 1000px;
    width: 100%;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(13, 15, 20, 0.85);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.header__inner {
    display: flex;
    align-items: center;
    height: 64px;
}

.logo {
    font-weight: 800;
    font-size: 20px;
    color: var(--text);
    text-decoration: none;
    letter-spacing: -0.02em;
}
.logo span {
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

main { flex: 1; }

/* Hero */
.hero {
    text-align: center;
    padding: 56px 0 32px;
}

.hero h1 {
    font-size: clamp(26px, 4.5vw, 40px);
    font-weight: 800;
    letter-spacing: -0.02em;
    line-height: 1.2;
    background: linear-gradient(135deg, var(--text) 40%, var(--accent-2));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    color: var(--muted);
    margin-top: 12px;
    font-size: 17px;
    max-width: 560px;
    margin-left: auto;
    margin-right: auto;
}

/* Panels */
.panel {
    background: var(--bg-alt);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    margin-bottom: 20px;
}

/* Dropzone */
.dropzone {
    border: 2px dashed rgba(255, 255, 255, 0.15);
    border-radius: var(--radius);
    padding: 44px 24px;
    text-align: center;
    transition: border-color 0.2s, background 0.2s;
    cursor: pointer;
    outline: none;
}
.dropzone:hover,
.dropzone:focus-visible {
    border-color: var(--accent-2);
    background: rgba(0, 209, 255, 0.03);
}
.dropzone.is-dragover {
    border-color: var(--accent-2);
    background: rgba(108, 92, 231, 0.08);
}

.dropzone__icon {
    width: 48px;
    height: 48px;
    color: var(--muted);
    margin-bottom: 12px;
}

.dropzone__title {
    font-size: 18px;
    font-weight: 600;
}

.dropzone__hint {
    color: var(--muted);
    margin: 8px 0;
}

.dropzone__note {
    color: var(--muted);
    font-size: 13px;
    margin-top: 14px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font: inherit;
    font-weight: 600;
    font-size: 15px;
    padding: 10px 20px;
    border-radius: 10px;
    border: 1px solid transparent;
    cursor: pointer;
    transition: transform 0.15s, box-shadow 0.15s, background 0.15s, opacity 0.15s;
    color: var(--text);
    background: var(--bg-hover);
}
.btn:hover:not(:disabled) { transform: translateY(-1px); }
.btn:active:not(:disabled) { transform: translateY(0); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }

.btn--primary {
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    border: none;
    color: #fff;
}
.btn--primary:hover:not(:disabled) { box-shadow: 0 6px 20px rgba(108, 92, 231, 0.4); }

.btn--ghost {
    background: transparent;
    border-color: var(--border);
}
.btn--ghost:hover:not(:disabled) { background: var(--bg-hover); }

.btn--danger { color: var(--danger); }

.btn--small {
    padding: 7px 14px;
    font-size: 13px;
    border-radius: 8px;
}

/* Controls */
.controls {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-end;
    gap: 24px;
}

.controls__group { min-width: 200px; }

.controls__label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--muted);
    margin-bottom: 10px;
}

.controls__hint {
    font-size: 12px;
    color: var(--muted);
    margin-top: 6px;
}

.controls__group--quality { flex: 1; }

.quality-value {
    color: var(--accent-2);
    font-variant-numeric: tabular-nums;
}

.controls__group--quality.is-disabled { opacity: 0.45; pointer-events: none; }

input[type="range"] {
    width: 100%;
    accent-color: var(--accent);
    cursor: pointer;
    height: 24px;
}

.format-select {
    display: inline-flex;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 4px;
    gap: 4px;
}

.format-select__option {
    font: inherit;
    font-weight: 600;
    font-size: 14px;
    padding: 8px 18px;
    border-radius: 8px;
    border: none;
    background: transparent;
    color: var(--muted);
    cursor: pointer;
    transition: background 0.15s, color 0.15s;
}
.format-select__option:hover { color: var(--text); }
.format-select__option.is-active {
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    color: #fff;
}

.controls__actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-left: auto;
}

/* File list */
.file-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 20px;
}

.file-row {
    display: grid;
    grid-template-columns: 64px 1fr auto;
    align-items: center;
    gap: 16px;
    background: var(--bg-alt);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 14px 18px;
}

.file-row__thumb {
    width: 64px;
    height: 64px;
    border-radius: 10px;
    object-fit: cover;
    background:
        repeating-conic-gradient(rgba(255,255,255,0.06) 0% 25%, transparent 0% 50%) 0 0 / 16px 16px,
        var(--bg);
    border: 1px solid var(--border);
}

.file-row__meta { min-width: 0; }

.file-row__name {
    font-weight: 600;
    font-size: 15px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.file-row__details {
    color: var(--muted);
    font-size: 13px;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px;
    margin-top: 2px;
}

.file-row__arrow { color: var(--muted); }

.file-row__result { color: var(--text); }
.file-row__result .delta--down { color: var(--success); }
.file-row__result .delta--up { color: var(--danger); }

.file-row__status {
    font-size: 12px;
    margin-top: 4px;
    color: var(--muted);
}
.file-row__status.is-error { color: var(--danger); }
.file-row__status.is-done { color: var(--success); }
.file-row__status.is-busy { color: var(--accent-2); }

.file-row__actions {
    display: flex;
    gap: 8px;
    align-items: center;
}

.file-row__remove {
    background: transparent;
    border: none;
    color: var(--muted);
    font-size: 20px;
    line-height: 1;
    cursor: pointer;
    padding: 6px 10px;
    border-radius: 8px;
    transition: color 0.15s, background 0.15s;
}
.file-row__remove:hover { color: var(--danger); background: var(--bg-hover); }

.empty-state {
    text-align: center;
    color: var(--muted);
    padding: 24px 0 40px;
}

/* Info */
.info { margin-bottom: 48px; }
.info h2 {
    font-size: 22px;
    margin-bottom: 18px;
    letter-spacing: -0.01em;
}

.info__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
}

.info__card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
}
.info__card h3 {
    font-size: 15px;
    margin-bottom: 8px;
    color: var(--accent-2);
}
.info__card p {
    font-size: 14px;
    color: var(--muted);
}

/* Footer */
.footer {
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    padding: 24px 0;
    text-align: center;
    color: var(--muted);
    font-size: 14px;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: var(--bg-alt);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 12px 22px;
    font-size: 14px;
    color: var(--text);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s, transform 0.25s;
    z-index: 200;
    max-width: min(90vw, 480px);
    text-align: center;
}
.toast.is-visible {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}
.toast.is-error { border-color: rgba(255, 92, 122, 0.5); color: var(--danger); }

/* Responsive */
@media (max-width: 640px) {
    .hero { padding: 40px 0 24px; }
    .controls { flex-direction: column; align-items: stretch; gap: 18px; }
    .controls__actions { margin-left: 0; }
    .controls__actions .btn { flex: 1; justify-content: center; }
    .file-row { grid-template-columns: 48px 1fr; }
    .file-row__thumb { width: 48px; height: 48px; }
    .file-row__actions { grid-column: 1 / -1; justify-content: flex-end; }
    .dropzone { padding: 32px 16px; }
}