:root {
    --cisco-green: #6cbd44;
    --cisco-blue: #00bceb;
    --cisco-dark-grey: #333333;
    --cisco-light-grey: #f4f4f4;
    --cisco-header-bg: #f9fafb;
    --border-color: #e0e0e0;
    --text-color: #333;
    --success-color: #4CAF50;
    --warning-color: #ff9800;
}

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

html, body {
    height: 100%;
    font-size: 1.1rem;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    color: var(--text-color);
    background-color: transparent;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    position: relative;
}

#techCanvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: radial-gradient(circle at top right, #f5f9fc 0%, #ffffff 100%);
}

/* --- Header con tono grisáceo --- */
header {
    padding: 15px 40px;
    border-bottom: 1px solid var(--border-color);
    background: var(--cisco-header-bg);
    backdrop-filter: blur(5px);
    box-shadow: 0 1px 3px rgba(0,0,0,0.04);
    flex-shrink: 0;
}

h1 {
    font-weight: 600;
    font-size: 24px;
    color: #444;
    display: flex;
    align-items: center;
    margin: 0;
}

h1::before {
    content: "🌐";
    margin-right: 12px;
    font-size: 1.4rem;
}

/* --- Contenedor Principal con menos separación --- */
.container {
    padding: 15px 40px;
    max-width: 90%;
    margin: 0 auto;
    width: 100%;
    flex: 1 0 auto;
}

/* --- Tabla de Configuración con menos padding --- */
.config-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 20px;
    background: white;
    border-radius: 6px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.04);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.config-table th {
    background-color: var(--cisco-blue);
    color: white;
    text-align: left;
    padding: 12px 15px;
    font-weight: 600;
    font-size: 14px;
}

.config-table td {
    padding: 12px 15px;
    border-bottom: 1px solid var(--border-color);
    vertical-align: middle;
}

.config-table tr:nth-child(even) {
    background-color: var(--cisco-light-grey);
}

.config-table tr:hover {
    background-color: #f8fcff;
}

/* --- Inputs --- */
.input-subnetting {
    padding: 8px 10px;
    border: 1px solid #d1d5db;
    border-radius: 4px;
    font-size: 14px;
    transition: all 0.2s;
    background-color: white;
}

.input-subnetting:focus {
    outline: none;
    border-color: var(--cisco-blue);
    box-shadow: 0 0 0 2px rgba(0, 188, 235, 0.15);
}

/* --- Botones NetAcad --- */
.btn-netacad {
    background-color: var(--cisco-green);
    color: #000000;
    border: none;
    padding: 8px 20px;
    border-radius: 18px;
    cursor: pointer;
    font-weight: bold;
    font-size: 13px;
    transition: all 0.2s;
    display: inline-block;
    text-align: center;
    text-decoration: none;
}

.btn-netacad:hover {
    transform: translateY(-1px);
    filter: brightness(1.08);
    box-shadow: 0 3px 6px rgba(108, 189, 68, 0.25);
}

/* --- Caja de Descripción --- */
.description-box {
    background-color: white;
    border-radius: 6px;
    padding: 16px 20px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.04);
    border: 1px solid var(--border-color);
    line-height: 1.5;
}

.description-box p {
    margin-bottom: 8px;
    font-size: 14px;
}

.description-box strong {
    color: var(--cisco-blue);
}

/* --- Contenedor para tabla de resultados con scroll horizontal --- */
.results-container {
    width: 100%;
    overflow-x: auto;
    margin-bottom: 20px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    background: white;
    box-shadow: 0 3px 10px rgba(0,0,0,0.04);
    min-height: 100px;
}

/* --- Mensaje cuando no hay resultados --- */
.results-container:empty::before {
    content: "Haz clic en 'Calcular' para ver los resultados del subnetting";
    display: block;
    text-align: center;
    padding: 40px 20px;
    color: #888;
    font-style: italic;
    font-size: 14px;
}

/* --- Tabla de Resultados (Generada por JS) con menos padding --- */
.subnetting-table {
    width: 100%;
    min-width: 800px;
    border-collapse: collapse;
    background: white;
    font-size: 13px;
}

.subnetting-table th {
    background-color: var(--cisco-blue);
    color: white;
    text-align: left;
    padding: 12px 15px;
    font-weight: 600;
    border-right: 1px solid rgba(255, 255, 255, 0.1);
    white-space: nowrap;
}

.subnetting-table th:last-child {
    border-right: none;
}

.subnetting-table td {
    padding: 10px 15px;
    border-bottom: 1px solid var(--border-color);
    vertical-align: middle;
    white-space: nowrap;
}

.subnetting-table tbody tr:nth-child(even) {
    background-color: #fafafa;
}

.subnetting-table tbody tr:hover {
    background-color: #f8fcff;
}

/* --- Personalización de scrollbars --- */
.results-container::-webkit-scrollbar {
    height: 8px;
    background-color: #f5f5f5;
    border-radius: 0 0 6px 6px;
}

.results-container::-webkit-scrollbar-thumb {
    background-color: #c1c1c1;
    border-radius: 4px;
    border: 2px solid #f5f5f5;
}

.results-container::-webkit-scrollbar-thumb:hover {
    background-color: #a8a8a8;
}

.results-container::-webkit-scrollbar-track {
    background-color: #f5f5f5;
    border-radius: 0 0 6px 6px;
}

/* Para Firefox */
.results-container {
    scrollbar-width: thin;
    scrollbar-color: #c1c1c1 #f5f5f5;
}

/* --- Footer pegado al fondo --- */
footer {
    background-color: var(--cisco-dark-grey);
    color: #ddd;
    padding: 10px 40px;
    font-size: 13px;
    flex-shrink: 0;
    margin-top: auto;
    width: 100%;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 25px;
    margin-bottom: 15px;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--cisco-blue);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: color 0.2s;
    font-size: 13px;
}

.footer-links a:hover {
    color: white;
    text-decoration: underline;
}

footer p {
    margin: 6px 0;
    color: #aaa;
    line-height: 1.4;
}

footer p i {
    margin-right: 6px;
    color: var(--cisco-green);
    font-size: 12px;
}

/* --- Responsive --- */
@media (max-width: 768px) {
    .container, header {
        padding: 12px 20px;
    }
    
    h1 {
        font-size: 20px;
    }
    
    .config-table {
        display: block;
        overflow-x: auto;
    }
    
    .footer-links {
        flex-direction: column;
        gap: 12px;
    }
    
    .btn-netacad {
        padding: 7px 16px;
        font-size: 12px;
    }
    
    .results-container::-webkit-scrollbar {
        height: 6px;
    }
}

@media (max-width: 480px) {
    header {
        padding: 10px 15px;
    }
    
    .container {
        padding: 10px 15px;
    }
    
    h1 {
        font-size: 18px;
    }
    
    h1::before {
        font-size: 16px;
        margin-right: 8px;
    }
    
    footer {
        padding: 20px 15px;
    }
}

/* --- Estilos para Checkbox --- */
input[type="checkbox"] {
    width: 16px;
    height: 16px;
    cursor: pointer;
    accent-color: var(--cisco-green);
}

label {
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    font-size: 13px;
}

/* --- Mejora para h3 --- */
h3 {
    margin-bottom: 12px;
    font-weight: 600;
    color: #555;
}

/* --- Botón VLSM en esquina --- */
body > a {
    position: fixed;
    right: 20px;
    top: 20px;
    z-index: 1000;
    text-decoration: none;
}

body > a button {
    background-color: var(--cisco-blue);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 18px;
    cursor: pointer;
    font-weight: bold;
    font-size: 13px;
    transition: all 0.2s;
}

body > a button:hover {
    transform: translateY(-1px);
    filter: brightness(1.1);
    box-shadow: 0 3px 6px rgba(0, 188, 235, 0.25);
}

/* Estilos para los inputs de nombres de subredes - estilo minimalista */
.subnet-name-input {
    width: 100px;
    padding: 0px 0;
    background: transparent;
    border: none;
    border-bottom: 1px solid transparent;
    border-radius: 0;
    font-size: 14px;
    color: #333;
    transition: all 0.3s ease;
    outline: none;
}

.subnet-name-input:focus {
    border-bottom: 2px solid #0066cc;
}

.subnet-name-input::placeholder {
    color: #888;
    opacity: 0.8;
}