:root {
    --bg-from: #f7f8fc;
    --bg-to: #eef1ff;
    --card: #ffffff;
    --border: #e6e8ef;
    --border-strong: #d1d5db;
    --text: #0b1020;
    --muted: #5f6678;
    --subtle: #8b91a3;

    --accent: #4f46e5;
    --accent-hover: #4338ca;
    --accent-soft: #eef2ff;
    --accent-ring: rgba(79, 70, 229, 0.15);

    --success: #15803d;
    --success-bg: #ecfdf5;
    --success-border: #a7f3d0;

    --error: #b91c1c;
    --error-bg: #fef2f2;
    --error-border: #fecaca;

    --info: #1e40af;
    --info-bg: #eff6ff;
    --info-border: #bfdbfe;

    --shadow-sm: 0 1px 2px rgba(15, 23, 42, .04);
    --shadow-md: 0 4px 16px -2px rgba(15, 23, 42, .06), 0 2px 6px -1px rgba(15, 23, 42, .04);
    --shadow-lg: 0 24px 48px -12px rgba(15, 23, 42, .12), 0 8px 16px -8px rgba(15, 23, 42, .06);
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: 15px;
    line-height: 1.5;
    color: var(--text);
    background: linear-gradient(180deg, var(--bg-from) 0%, var(--bg-to) 100%);
    background-attachment: fixed;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.wrap {
    max-width: 720px;
    margin: 0 auto;
    padding: 64px 24px 96px;
}

/* Header --------------------------------------------------------------- */

header {
    margin-bottom: 28px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 6px 12px 6px 8px;
    background: white;
    border: 1px solid var(--border);
    border-radius: 999px;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: .02em;
    color: var(--muted);
    box-shadow: var(--shadow-sm);
    margin-bottom: 20px;
}
.brand .dot {
    width: 18px;
    height: 18px;
    border-radius: 999px;
    background: linear-gradient(135deg, #6366f1, #818cf8);
    box-shadow: inset 0 -2px 4px rgba(0,0,0,.15);
}

header h1 {
    margin: 0 0 6px;
    font-size: 30px;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text);
}

header .sub {
    margin: 0;
    color: var(--muted);
    font-size: 16px;
}

/* Card ----------------------------------------------------------------- */

.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 24px;
    display: grid;
    gap: 18px;
    box-shadow: var(--shadow-md);
}

/* Mode toggle (segmented control) -------------------------------------- */

.modes {
    border: 0;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 6px;
}
.modes legend {
    padding: 0;
    font-size: 12px;
    font-weight: 600;
    color: var(--muted);
    letter-spacing: .04em;
    text-transform: uppercase;
}
.mode-segments {
    display: grid;
    grid-template-columns: 1fr 1fr;
    background: #f1f3f9;
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 4px;
    gap: 4px;
    margin-top: 6px;
}
.modes .mode {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 9px 12px;
    border-radius: 9px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    color: var(--muted);
    transition: background .15s, color .15s, box-shadow .15s;
    user-select: none;
}
.modes .mode input { position: absolute; opacity: 0; pointer-events: none; }
.modes .mode:has(input:checked) {
    background: white;
    color: var(--text);
    box-shadow: var(--shadow-sm);
}
.modes .mode svg { width: 16px; height: 16px; opacity: .75; }
.modes .mode:has(input:checked) svg { opacity: 1; color: var(--accent); }

/* Fields --------------------------------------------------------------- */

.field {
    display: grid;
    gap: 6px;
}

.field .label {
    font-size: 12px;
    font-weight: 600;
    color: var(--muted);
    letter-spacing: .04em;
    text-transform: uppercase;
}

.field select,
.field input[type="text"] {
    padding: 11px 13px;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: white;
    font: inherit;
    color: var(--text);
    transition: border-color .15s, box-shadow .15s;
    width: 100%;
}
.field select:focus,
.field input[type="text"]:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 4px var(--accent-ring);
}

.field.checkbox {
    grid-template-columns: auto 1fr;
    align-items: center;
    gap: 10px;
    cursor: pointer;
}
.field.checkbox input[type=checkbox] {
    width: 16px;
    height: 16px;
    accent-color: var(--accent);
    cursor: pointer;
}
.field.checkbox span { color: var(--text); font-size: 14px; }

/* Drop zone ------------------------------------------------------------ */

.dropzone {
    position: relative;
    border: 1.5px dashed var(--border-strong);
    border-radius: 14px;
    padding: 44px 24px;
    text-align: center;
    background: linear-gradient(180deg, #fbfcff 0%, #f5f7ff 100%);
    transition: border-color .15s, background .15s, transform .15s;
    cursor: pointer;
}
.dropzone:hover {
    border-color: var(--accent);
    background: linear-gradient(180deg, #f8faff 0%, #eef1ff 100%);
}
.dropzone.drag {
    border-color: var(--accent);
    border-style: solid;
    background: var(--accent-soft);
    transform: scale(1.005);
}

.dz-icon {
    width: 44px;
    height: 44px;
    margin: 0 auto 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: white;
    border: 1px solid var(--border);
    border-radius: 12px;
    color: var(--accent);
    box-shadow: var(--shadow-sm);
}
.dz-icon svg { width: 22px; height: 22px; }

.dz-title { font-size: 15px; font-weight: 500; margin: 0 0 4px; color: var(--text); }
.dz-hint { color: var(--muted); margin: 0 0 16px; font-size: 13px; }
.dz-buttons { display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; }

/* Buttons -------------------------------------------------------------- */

button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 9px 14px;
    border-radius: 10px;
    border: 1px solid var(--border);
    background: white;
    color: var(--text);
    font: inherit;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: background .15s, border-color .15s, transform .05s, box-shadow .15s;
}
button:hover { border-color: var(--border-strong); background: #fafbff; }
button:active { transform: translateY(1px); }
button:focus-visible { outline: none; box-shadow: 0 0 0 4px var(--accent-ring); }

button svg { width: 14px; height: 14px; opacity: .8; pointer-events: none; }

button[type=submit] {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
    padding: 11px 22px;
    font-weight: 600;
    box-shadow: 0 6px 14px -4px rgba(79, 70, 229, .35);
}
button[type=submit]:hover:not(:disabled) {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
    box-shadow: 0 10px 18px -4px rgba(79, 70, 229, .45);
}
button[type=submit]:disabled {
    opacity: .55;
    cursor: not-allowed;
    box-shadow: none;
}

/* File list ------------------------------------------------------------ */

.files {
    border: 1px solid var(--border);
    border-radius: 12px;
    background: #fafbff;
    padding: 12px 16px;
    max-height: 180px;
    overflow-y: auto;
    font-size: 12.5px;
    color: var(--muted);
    font-family: ui-monospace, SFMono-Regular, "JetBrains Mono", Menlo, Consolas, monospace;
}
.files .summary {
    color: var(--text);
    font-weight: 600;
    margin-bottom: 8px;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter", sans-serif;
    font-size: 13px;
    display: flex;
    align-items: center;
    gap: 6px;
}
.files .summary::before {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: 999px;
    background: var(--accent);
}
.files .file { padding: 1px 0; }

/* Actions row + status ------------------------------------------------- */

.actions {
    display: flex;
    gap: 8px;
    align-items: center;
    flex-wrap: wrap;
}

.status {
    padding: 12px 14px;
    border-radius: 12px;
    font-size: 14px;
    line-height: 1.4;
}
.status.info    { background: var(--info-bg);    color: var(--info);    border: 1px solid var(--info-border); }
.status.success { background: var(--success-bg); color: var(--success); border: 1px solid var(--success-border); }
.status.error   { background: var(--error-bg);   color: var(--error);   border: 1px solid var(--error-border); }
.status a { color: inherit; text-decoration: underline; font-weight: 600; text-decoration-thickness: 2px; text-underline-offset: 2px; }

/* Alerts (e.g. config error) ------------------------------------------- */

.alert.error {
    background: var(--error-bg);
    color: var(--error);
    border: 1px solid var(--error-border);
    padding: 12px 14px;
    border-radius: 12px;
    margin-bottom: 16px;
    font-size: 14px;
}

/* Misc ----------------------------------------------------------------- */

[hidden] { display: none !important; }

@media (max-width: 540px) {
    .wrap { padding: 32px 16px 64px; }
    header h1 { font-size: 24px; }
    .card { padding: 18px; }
    .dropzone { padding: 32px 16px; }
}