:root {
    --azul: #2563eb;
    --azul-escuro: #1d4ed8;
    --verde: #16a34a;
    --cinza-fundo: #f3f4f6;
    --cinza-borda: #d1d5db;
    --texto: #1f2937;
}

* { box-sizing: border-box; }

body {
    font-family: -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
    background: var(--cinza-fundo);
    color: var(--texto);
    margin: 0;
    padding: 16px;
}

.container {
    max-width: 720px;
    margin: 0 auto;
    background: #fff;
    border-radius: 12px;
    padding: 24px;
    box-shadow: 0 1px 4px rgba(0,0,0,0.08);
}

h1 { font-size: 1.4rem; margin-top: 0; }
h2 { font-size: 1.1rem; }
h3 { font-size: 1rem; color: #374151; }

.topo {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.link-sair {
    font-size: 0.85rem;
    color: #6b7280;
    text-decoration: none;
}
.link-sair:hover { text-decoration: underline; }

.tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 20px;
    border-bottom: 2px solid var(--cinza-borda);
}

.tab-btn {
    flex: 1;
    padding: 12px 8px;
    background: none;
    border: none;
    font-size: 0.95rem;
    font-weight: 600;
    color: #6b7280;
    cursor: pointer;
    border-bottom: 3px solid transparent;
    margin-bottom: -2px;
}

.tab-btn.active {
    color: var(--azul);
    border-bottom-color: var(--azul);
}

.tab-panel { display: none; }
.tab-panel.active { display: block; }

.hint {
    font-size: 0.9rem;
    color: #4b5563;
    margin-top: 0;
}

form { display: flex; flex-direction: column; gap: 14px; }

.substituicao-rapida {
    border: 1px solid var(--cinza-borda);
    border-radius: 8px;
    padding: 14px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.substituicao-rapida legend {
    padding: 0 6px;
    font-size: 0.85rem;
    font-weight: 600;
    color: #374151;
}

.checkbox-row {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    color: #374151;
    cursor: pointer;
}

.checkbox-row input[type="checkbox"] {
    width: 16px;
    height: 16px;
    cursor: pointer;
}

.file-drop {
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px dashed var(--cinza-borda);
    border-radius: 8px;
    padding: 20px;
    cursor: pointer;
    text-align: center;
    font-size: 0.9rem;
    color: #4b5563;
}

.file-drop input[type="file"] { display: none; }

.campo { display: flex; flex-direction: column; gap: 4px; }
.campo label { font-size: 0.85rem; font-weight: 600; color: #374151; }
.campo input[type="text"] {
    padding: 10px;
    border: 1px solid var(--cinza-borda);
    border-radius: 6px;
    font-size: 1rem;
}

.btn-primary, .btn-secondary {
    padding: 12px 16px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
}

.btn-primary {
    background: var(--azul);
    color: #fff;
}
.btn-primary:hover { background: var(--azul-escuro); }
.btn-primary:disabled { background: #9ca3af; cursor: not-allowed; }

.btn-secondary {
    background: var(--verde);
    color: #fff;
    margin-right: 8px;
}
.btn-secondary:hover { opacity: 0.9; }

.download-row { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }

.status {
    margin-top: 12px;
    font-size: 0.9rem;
}
.status.error { color: #dc2626; }
.status.success { color: var(--verde); }

.resultado { margin-top: 20px; }
.hidden { display: none; }

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}
th, td {
    text-align: left;
    padding: 8px 10px;
    border-bottom: 1px solid var(--cinza-borda);
}
th { background: #f9fafb; }

@media (max-width: 480px) {
    .container { padding: 16px; }
    .tab-btn { font-size: 0.85rem; padding: 10px 4px; }
}