:root {
    --bg: #f4f7fb;
    --panel: #ffffff;
    --panel-border: #cbd5e1;
    --text: #0f172a;
    --muted: #64748b;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --danger-bg: #fee2e2;
    --danger-text: #991b1b;
    --warning-bg: #fef3c7;
    --warning-text: #92400e;
    --success-bg: #dcfce7;
    --success-text: #166534;
    --info-bg: rgba(59, 130, 246, 0.12);
    font-family: "Segoe UI", system-ui, sans-serif;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    min-height: 100vh;
    background: radial-gradient(circle at top, rgba(59, 130, 246, 0.12), transparent 45%), var(--bg);
    color: var(--text);
}

.page {
    max-width: 56rem;
    margin: 0 auto;
    padding: 2.5rem 1.25rem 1.5rem;
}

.header h1 {
    margin: 0 0 0.35rem;
    font-size: 1.5rem;
    font-weight: 700;
}

.subtitle {
    margin: 0;
    color: var(--muted);
    font-size: 0.95rem;
    line-height: 1.45;
}

.build-meta {
    margin: 0.5rem 0 0;
    font-size: 0.8rem;
    color: var(--muted);
}

.template-meta {
    margin-top: 1rem;
    padding: 0.75rem 1rem;
    border: 1px solid var(--panel-border);
    border-radius: 0.75rem;
    background: var(--panel);
    font-size: 0.85rem;
}

.template-toggle { margin-left: 0.35rem; font-size: 0.85rem; }
.template-upload { margin-top: 0.75rem; }

.messages { margin: 1rem 0 0; }

.message {
    padding: 0.85rem 1rem;
    border-radius: 0.75rem;
    margin-bottom: 0.75rem;
    font-size: 0.95rem;
}

.message:last-child { margin-bottom: 0; }
.message-danger { background: var(--danger-bg); color: var(--danger-text); }
.message-warning { background: var(--warning-bg); color: var(--warning-text); }
.message-success { background: var(--success-bg); color: var(--success-text); }

.upload-form { margin-top: 1rem; }

.drop-zone {
    position: relative;
    display: flex;
    align-items: center;
    gap: 0.85rem;
    padding: 0.85rem 1rem;
    border: 2px dashed var(--panel-border);
    border-radius: 0.75rem;
    background: var(--panel);
    cursor: pointer;
    transition: border-color 0.15s ease, background 0.15s ease;
}

.drop-zone:hover, .drop-zone:focus-visible, .drop-zone.drag-over {
    border-color: var(--accent);
    background: #f8fbff;
    outline: none;
}

.drop-zone.has-file {
    border-style: solid;
    border-color: var(--accent);
}

.drop-zone.busy {
    opacity: 0.65;
    cursor: wait;
    pointer-events: none;
}

.file-input-native {
    position: absolute;
    width: 0.1px;
    height: 0.1px;
    opacity: 0;
    overflow: hidden;
}

.drop-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 999px;
    background: rgba(59, 130, 246, 0.15);
    color: var(--accent);
    font-weight: 700;
    font-size: 0.65rem;
}

.drop-title {
    margin: 0;
    font-size: 0.95rem;
    font-weight: 600;
}

.selected-file {
    margin: 0.25rem 0 0;
    color: var(--success-text);
    font-size: 0.85rem;
    font-weight: 500;
    word-break: break-all;
}

.upload-controls { margin-top: 1rem; }

.options-panel {
    margin-top: 0.75rem;
    border: 1px solid var(--panel-border);
    border-radius: 0.75rem;
    background: var(--panel);
    overflow: hidden;
}

.options-heading {
    margin: 0;
    padding: 0.75rem 1rem;
    font-size: 0.95rem;
    font-weight: 600;
    border-bottom: 1px solid var(--panel-border);
    background: #f8fafc;
}

.options-list {
    display: flex;
    flex-direction: column;
}

.option-item {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.85rem 1rem;
    border-bottom: 1px solid var(--panel-border);
}

.option-item:last-child {
    border-bottom: none;
}

.option-check {
    flex-shrink: 0;
    padding-top: 0.15rem;
}

.option-check input[type="checkbox"] {
    width: 1rem;
    height: 1rem;
    margin: 0;
    accent-color: var(--accent);
    cursor: pointer;
}

.option-body {
    flex: 1;
    min-width: 0;
}

.option-label {
    display: block;
    margin: 0 0 0.35rem;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
}

.option-description {
    font-size: 0.78rem;
    line-height: 1.45;
    color: var(--muted);
}

.option-description hr {
    margin: 0.5rem 0;
    border: 0;
    border-top: 1px solid var(--panel-border);
}

.form-actions {
    display: flex;
    justify-content: center;
    margin-top: 1rem;
    margin-bottom: 0.25rem;
}

.option-group { min-width: 0; }

.option-row {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    margin: 0;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
}

.option-row input[type="checkbox"] {
    margin: 0;
    accent-color: var(--accent);
}

.option-hint {
    margin: 0.15rem 0 0 1.35rem;
    font-size: 0.75rem;
    line-height: 1.35;
    color: var(--muted);
}

.upload-btn-col {
    display: flex;
    align-items: flex-end;
}

.btn-submit {
    min-width: 6.5rem;
    padding: 0.4rem 0.9rem;
    border: none;
    border-radius: 0.5rem;
    background: var(--accent);
    color: #fff;
    font-size: 0.9rem;
    font-weight: 600;
}

.btn-submit:hover:not(:disabled) { background: var(--accent-hover); }
.btn-submit:disabled { opacity: 0.55; cursor: not-allowed; }

.results-panel {
    margin-top: 1rem;
    padding: 1rem;
    border: 1px solid var(--panel-border);
    border-radius: 0.75rem;
    background: var(--panel);
}

.results-panel h2 {
    margin: 0 0 0.75rem;
    font-size: 1.1rem;
}

.results-buttons {
    margin-top: 1.25rem;
    text-align: center;
}

.results-buttons p {
    margin: 0 0 0.85rem;
}

.results-buttons p:last-child {
    margin-bottom: 0;
}

.results-btn {
    min-width: 14rem;
    padding: 0.45rem 1.25rem;
    border-radius: 0.5rem;
    font-size: 0.9rem;
    font-weight: 600;
    text-decoration: none;
}

.results-buttons .btn-primary {
    border: none;
    background: var(--accent);
    color: #fff;
}

.results-buttons .btn-primary:hover {
    background: var(--accent-hover);
    color: #fff;
}

.results-buttons .btn-outline-primary {
    border: 1px solid var(--accent);
    color: var(--accent);
    background: transparent;
}

.results-buttons .btn-outline-primary:hover {
    background: rgba(59, 130, 246, 0.1);
    color: var(--accent-hover);
    border-color: var(--accent-hover);
}

.results-buttons .btn-outline-secondary {
    border: 1px solid var(--panel-border);
    color: var(--muted);
    background: transparent;
}

.results-buttons .btn-outline-secondary:hover {
    background: #f8fafc;
    color: var(--text);
    border-color: var(--muted);
}

.results-btn-debug {
    min-width: auto;
    font-size: 0.78rem;
    font-weight: 500;
    padding: 0.35rem 1rem;
}

.page-footer {
    margin-top: 1.5rem;
    text-align: center;
    font-size: 0.75rem;
    color: var(--muted);
}

.smaller { font-size: 0.7rem; }

@media (max-width: 767.98px) {
    .form-actions { justify-content: stretch; }
    .form-actions .btn-submit { width: 100%; }
}