html, body {
    font-family: "Segoe UI", Arial, sans-serif;
    margin: 0;
    background: #f3f4f6;
    color: #1f2937;
}

.page {
    max-width: 720px;
    margin: 0 auto;
    padding: 32px 20px 48px;
}

.hero h1 {
    margin: 0 0 8px;
    font-size: 2rem;
}

.subtitle {
    margin: 0 0 24px;
    color: #4b5563;
}

.drop-zone {
    background: #fff;
    border: 2px dashed #9ca3af;
    border-radius: 12px;
    padding: 40px 24px;
    text-align: center;
    transition: border-color 0.15s, background 0.15s;
}

.drop-zone.drag-over {
    border-color: #2563eb;
    background: #eff6ff;
}

.drop-title {
    margin: 0;
    font-size: 1.25rem;
    font-weight: 600;
}

.drop-hint {
    margin: 8px 0 0;
    color: #6b7280;
}

.file-name {
    margin: 16px 0 0;
    word-break: break-all;
    color: #374151;
}

.actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    margin-top: 20px;
    align-items: center;
}

.file-input {
    display: none;
}

.browse-input {
    max-width: 280px;
}

.btn {
    border: none;
    border-radius: 8px;
    padding: 10px 18px;
    font-size: 1rem;
    cursor: pointer;
}

.btn.primary {
    background: #2563eb;
    color: #fff;
}

.btn.primary:disabled {
    background: #93c5fd;
    cursor: not-allowed;
}

.btn.secondary {
    background: #e5e7eb;
    color: #111827;
}

.status {
    margin-top: 20px;
    padding: 12px 14px;
    border-radius: 8px;
    background: #fff;
    border: 1px solid #e5e7eb;
    white-space: pre-wrap;
}

.status.busy {
    border-color: #bfdbfe;
    background: #eff6ff;
}

.status.error {
    border-color: #fecaca;
    background: #fef2f2;
    color: #991b1b;
}