:root {
    --bg-color: #121212;
    --card-bg: #1e1e1e;
    --card-hover: #2c2c2c;
    --text-primary: #e0e0e0;
    --text-secondary: #a0a0a0;
    --accent: #3b82f6; /* Azul base */
    --accent-glow: rgba(59, 130, 246, 0.3);
    --unit-highlight: #4ade80; /* Verde input */
    --danger: #ef4444; /* Rojo emergencia */
    --warning: #f59e0b; /* Amarillo alerta */
    --info: #0ea5e9; /* Cyan info */
    --border-radius: 8px;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.5;
    padding-bottom: 50px;
}

/* --- Header Sticky --- */
header {
    background-color: #18181b;
    padding: 1.5rem 1rem;
    border-bottom: 1px solid #333;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
    text-align: center;
}

h1 {
    font-size: 1.4rem;
    margin-bottom: 0.5rem;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 1px;
}

header p {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-bottom: 1rem;
}

.input-group {
    max-width: 400px;
    margin: 0 auto;
}

input[type="text"] {
    background-color: #27272a;
    border: 2px solid #3f3f46;
    color: #fff;
    padding: 0.8rem 1rem;
    border-radius: var(--border-radius);
    width: 100%;
    font-family: 'Roboto Mono', monospace;
    font-size: 1.2rem;
    text-align: center;
    transition: all 0.3s ease;
}

input[type="text"]:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 15px var(--accent-glow);
}

/* --- Estructura Principal --- */
.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 1rem;
}

section {
    margin-top: 2rem;
}

h2 {
    font-size: 1.1rem;
    color: var(--text-secondary);
    border-bottom: 1px solid #333;
    padding-bottom: 0.5rem;
    margin-bottom: 1rem;
    text-transform: uppercase;
    display: inline-block;
    width: 100%;
}

.danger-title {
    color: var(--danger);
    border-color: var(--danger);
    font-weight: 800;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1rem;
}

/* --- Tarjetas (Cards) --- */
.card {
    background-color: var(--card-bg);
    border: 1px solid #333;
    border-radius: var(--border-radius);
    padding: 1rem;
    cursor: pointer;
    transition: transform 0.2s, background-color 0.2s;
    position: relative;
    user-select: none;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.card:hover {
    background-color: var(--card-hover);
    transform: translateY(-2px);
    border-color: #555;
}

.card:active {
    transform: translateY(0);
}

.card.copied {
    border-color: var(--unit-highlight);
    background-color: rgba(74, 222, 128, 0.1);
}

.full-width {
    grid-column: 1 / -1;
}

/* --- Tipos de Tarjetas (Colores) --- */
/* Danger (999, 998) */
.card.danger {
    border-color: rgba(239, 68, 68, 0.5);
    background-color: rgba(239, 68, 68, 0.05);
}
.card.danger .card-header {
    color: var(--danger);
}
.card.danger:hover {
    background-color: rgba(239, 68, 68, 0.15);
}

/* Warning (BOLO, 10-15) */
.card.warning {
    border-color: rgba(245, 158, 11, 0.5);
    background-color: rgba(245, 158, 11, 0.05);
}
.card.warning .card-header {
    color: var(--warning);
}

/* Info (Claves) */
.card.info {
    border-color: rgba(14, 165, 233, 0.5);
    background-color: rgba(14, 165, 233, 0.05);
}
.card.info .card-header {
    color: var(--info);
}

/* --- Contenido Interno --- */
.card-header {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 0.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-header::after {
    content: "COPIAR";
    font-size: 0.6rem;
    background: #222;
    padding: 2px 6px;
    border-radius: 4px;
    color: #666;
    border: 1px solid #333;
}

.code-content {
    font-family: 'Roboto Mono', monospace;
    font-size: 0.85rem;
    color: var(--text-primary);
    word-break: break-word;
}

.unit {
    font-weight: bold;
    color: #666;
}

.unit.active {
    color: var(--unit-highlight);
    text-decoration: underline;
    text-decoration-style: dotted;
}

/* CLASE ESPECIAL: Elementos que NO se copian */
.no-copy {
    opacity: 0.5;
    font-style: italic;
    user-select: none;
    font-size: 0.85em;
    color: #777;
}
.card:hover .no-copy {
    opacity: 0.8;
    color: #999;
}

/* --- Tabla de Referencia --- */
.table-container {
    overflow-x: auto;
}
.ref-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
    color: var(--text-secondary);
    background: #1a1a1a;
    border-radius: var(--border-radius);
}
.ref-table th, .ref-table td {
    border: 1px solid #333;
    padding: 0.7rem;
    text-align: left;
}
.ref-table th {
    background-color: #252525;
    color: var(--accent);
    text-transform: uppercase;
    font-size: 0.75rem;
}
.ref-table tr:hover {
    background-color: #222;
}

/* --- Toast --- */
#toast {
    visibility: hidden;
    min-width: 250px;
    background-color: var(--accent);
    color: #fff;
    text-align: center;
    border-radius: 50px;
    padding: 12px;
    position: fixed;
    z-index: 1000;
    left: 50%;
    bottom: 30px;
    transform: translateX(-50%);
    box-shadow: 0 4px 12px rgba(0,0,0,0.5);
    font-weight: 600;
    font-size: 0.9rem;
    opacity: 0;
    transition: opacity 0.3s, bottom 0.3s;
}

#toast.show {
    visibility: visible;
    opacity: 1;
    bottom: 50px;
}

/* Responsive */
@media (max-width: 600px) {
    .grid {
        grid-template-columns: 1fr;
    }
}