:root {
    --primary-color: #3498db;
    --secondary-color: #2980b9;
    --background-color: #f5f7fa;
    --card-color: #ffffff;
    --text-color: #333333;
    --border-color: #dddddd;
    --success-color: #2ecc71;
    --error-color: #e74c3c;
    --warning-color: #f39c12;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    margin: 0;
    padding: 20px;
    line-height: 1.6;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 5px; /* reduced from 20px */
}

.container.compact {
    padding: 10px;
}

/* Compact cards and inputs */
.container.compact .card {
    padding: 10px; /* reduced from 12/20 */
    border-radius: 6px;
}

.container.compact h1 {
    font-size: 1.1rem;
}

.container.compact h2 {
    font-size: 0.95rem;
}

.container.compact label {
    font-size: 0.85rem;
    margin-bottom: 4px;
    font-weight: 600;
}

.container.compact input[type="text"],
.container.compact input[type="number"],
.container.compact select {
    padding: 6px 8px; /* slightly smaller */
    font-size: 13px;
}

.language-selector {
    width: 25%;
    margin-bottom: 20px;
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--card-color);
    align-self: flex-start;
}

.card {
    background-color: var(--card-color);
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    padding: 20px;
}

h1, h2, h3 {
    color: var(--primary-color);
    margin-bottom: 8px; /* reduced from 15px */
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px; /* reduced */
    margin-bottom: 12px; /* slightly smaller */
}

.form-group {
    margin-bottom: 8px; /* reduced from 15px */
    display: flex;
    flex-direction: column;
}

label {
    margin-bottom: 3px; /* reduced from 5px */
    font-weight: 600;
}

input[type="text"],
input[type="number"],
select {
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
}

/* input[type="number"] {
    -moz-appearance: textfield;
}
 */
input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.error-message {
    color: var(--error-color);
    font-size: 0.8rem;
    margin-top: 5px;
    height: 15px;
}

button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s;
}

button:hover {
    background-color: var(--secondary-color);
}

.button-group {
    display: flex;
    gap: 8px;
    margin-top: 8px; /* reduced from 15px */
}

/* Top bar: tabs + language selector */
.top-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    margin-bottom: 6px;
}

/* Tabs container */
.tabs {
    display: flex;
    gap: 6px;
    align-items: center;
}

/* Tab button style */
.tab-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 6px 10px;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.9rem;
    transition: background-color 0.18s, color 0.18s, border-color 0.18s;
}

/* NEW: ocultar contenidos de pestañas no activas */
.tab-content {
    display: none;
}
.tab-content.active {
    display: block;
}

/* Unselected hover */
.tab-btn:hover {
    background-color: rgba(52,152,219,0.08);
}

/* Selected tab */
.tab-btn.active {
    background-color: var(--primary-color);
    color: #fff;
    border-color: var(--primary-color);
    box-shadow: 0 2px 6px rgba(52,152,219,0.12);
}

/* Language selector aligned to right inside top-bar */
.language-selector {
    width: auto; /* fit content */
    min-width: 160px;
    padding: 6px 8px;
    font-size: 0.9rem;
}

/* top controls grouping (state + language) */
.top-controls {
    display: flex;
    gap: 8px;
    align-items: center;
}

/* State selector appearance */
.state-selector {
    min-width: 120px;
    padding: 6px 8px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background: var(--card-color);
    font-size: 0.9rem;
}

/* Logo fixed top-right */
.logo {
    position: fixed;
    top: 12px;
    right: 12px;
    width: 56px;
    height: auto;
    z-index: 1200;
    border-radius: 6px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.12);
}

/* Ensure container has top padding so content doesn't overlap logo on very small screens */
@media (max-width: 520px) {
    .logo { width: 44px; top: 8px; right: 8px; }
    .container { padding-top: 54px; }
}

/* If container already had compact padding, keep it aligned */
@media (min-width: 900px) {
    .top-bar { margin-bottom: 10px; }
}

/* Desktop / wide screens: force form + result to full width (no side-by-side) */
@media (min-width: 900px) {
    /* En pantallas anchas mostrar solo la pestaña activa */
    .tab-content.active {
        display: block; /* mantener una sola columna: formulario encima, resultado debajo */
        gap: 0;
    }

    /* make the main form take full width */
    .tab-content.active > .card.calculator,
    .tab-content.active > .card.icmsst-calculator {
        flex: none;
        min-width: 0;
        max-width: 100%;
        width: 100%;
    }

    /* result column full width below the form */
    .tab-content.active > .card.result-section,
    #resultIcmsStSection {
        flex: none;
        max-width: 100%;
        width: 100%;
        margin-top: 8px;
    }
}

.result-section {
    margin-top: 10px; /* reduced from 20px */
    transition: all 0.3s ease;
}

.result-content {
    padding: 8px; /* reduced from 15px */
    background-color: #e8f4fd;
    border-left: 4px solid var(--primary-color);
    border-radius: 4px;
    margin-bottom: 15px;
}

.result-content strong {
    font-size: 18px;
    color: var(--success-color);
}

.hidden {
    display: none;
}

.history-item {
    padding: 10px; /* reduced from 15px */
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 8px;
}

.history-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
}

.search-box {
    margin-bottom: 20px;
}

.hidden {
    display: none;
}

.radio-group {
    display: flex;
    gap: 12px; /* reduced from 20px */
    margin-bottom: 12px;
}

.radio-option {
    display: flex;
    align-items: center;
    gap: 8px;
}

@media (max-width: 768px) {
    .form-grid {
        grid-template-columns: 1fr;
    }
    
    .language-selector {
        width: 100%;
    }
    
    .button-group {
        flex-direction: column;
    }
    
    button {
        width: 100%;
    }

    /* on narrow screens, results appear below form */
    .tab-content > .card.result-section {
        max-width: 100%;
    }
}