/* --- Variables de Tema y Estilos Globales --- */
:root {
    --bg-color-dark: #1a1a1a;
    --surface-color-dark: #2c2c2c;
    --primary-color-dark: #00e676;
    --text-color-dark: #f0f0f0;
    --border-color-dark: #444;
    --text-color-light: #1a1a1a;

    --font-family: 'Poppins', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --border-radius: 6px;
    --box-shadow: 0 6px 15px rgba(0, 0, 0, 0.2);
}

/* Forzar tema oscuro */
[data-theme="dark"] {
    --bg-color: var(--bg-color-dark);
    --surface-color: var(--surface-color-dark);
    --primary-color: var(--primary-color-dark);
    --text-color: var(--text-color-dark);
    --border-color: var(--border-color-dark);
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* --- Cabecera y Título de Página --- */
header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 2rem;
    background-color: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--box-shadow);
}

.logo-link {
    display: flex;
    align-items: center;
    text-decoration: none;
    transition: opacity 0.2s ease;
}

.logo-link:hover {
    opacity: 0.8;
}

.logo { max-height: 45px; }

.header-nav {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.nav-button {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1.2rem;
    background-color: var(--primary-color);
    color: #ffffff;
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    border-radius: var(--border-radius);
    transition: all 0.2s ease;
}

.nav-button i {
    font-size: 0.9rem;
    color: #ffffff;
    transition: transform 0.2s ease;
}

.nav-button:hover {
    background-color: #00ff88;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 230, 118, 0.3);
}

.nav-button:hover i {
    transform: scale(1.1);
}

.page-title-container {
    text-align: center;
    margin-bottom: 3rem;
}
.page-title-container h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}
.page-title-container p {
    font-size: 1.1rem;
    color: #a0a0a0;
    margin: 0;
}
.page-title-container h1::after {
    content: '';
    display: block;
    width: 80px;
    height: 3px;
    background-color: var(--primary-color);
    margin: 0.75rem auto 0;
    border-radius: 2px;
}

/* --- Contenedor Principal y Layout --- */
.main-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2rem;
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    flex: 1;
    box-sizing: border-box;
}

.calculator-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    width: 100%;
}
@media (min-width: 900px) {
    .calculator-container {
        grid-template-columns: 400px 1fr;
    }
    .calculator-card { grid-row: 1 / span 1; }
    .info-card { grid-row: 2 / span 1; }
    .results-card { grid-column: 2 / 3; grid-row: 1 / span 2; }
}

.calculator-card, .info-card, .results-card {
    background-color: var(--surface-color);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    border: 1px solid var(--border-color);
}

h2 {
    margin-top: 0;
    font-size: 1.3rem;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.75rem;
    margin-bottom: 1.5rem;
}

/* --- Formulario --- */
.form-group { margin-bottom: 1.5rem; }
label { display: block; margin-bottom: 0.5rem; font-weight: bold; }
input[type="text"], .select-wrapper {
    width: 100%;
    box-sizing: border-box;
}
input[type="text"], select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    background-color: var(--bg-color);
    color: var(--text-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    box-sizing: border-box;
    transition: all 0.2s ease;
}
input[type="text"]:focus, select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 230, 118, 0.25);
}
.select-wrapper { position: relative; }
.select-wrapper::after {
    content: '\f078';
    font-family: "Font Awesome 6 Free";
    font-weight: 900;
    position: absolute;
    top: 50%;
    right: 1rem;
    transform: translateY(-50%);
    pointer-events: none;
    color: var(--primary-color);
}
select { -webkit-appearance: none; appearance: none; }

.calculate-button {
    width: 100%;
    padding: 0.8rem;
    font-size: 1.1rem;
    font-weight: bold;
    color: var(--text-color-light);
    background-color: var(--primary-color);
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
}
.calculate-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 230, 118, 0.25);
}

/* --- Tabla de Resultados --- */
.results-card table {
    width: 100%;
    border-collapse: collapse;
}
.results-card td {
    padding: 0.85rem 0.5rem;
    border-bottom: 1px solid var(--border-color);
    vertical-align: middle;
}
.results-card tr:last-child td { border-bottom: none; }
.results-card td:first-child {
    font-weight: bold;
    color: var(--text-color);
    width: 150px;
}
.results-card td:nth-child(2) {
    font-family: 'Courier New', Courier, monospace;
    font-weight: bold;
    color: var(--primary-color);
}
.copy-cell {
    width: 40px;
    text-align: center;
    cursor: pointer;
    color: #888;
    transition: color 0.2s ease;
}
.copy-cell:hover { color: var(--primary-color); }
.copy-cell.copied { color: #28a745; }
.binary-data { font-size: 0.9rem; }

/* --- Tarjeta de Información --- */
.info-card ul {
    list-style: none;
    padding: 0;
    margin: 0;
}
.info-card li {
    padding: 0.4rem 0;
    font-size: 0.9rem;
}

/* --- Utilidades --- */
.card-hidden { display: none; }
.error-hidden { display: none; }
.error-message {
    display: block;
    background-color: #dc3545;
    color: white;
    padding: 1rem;
    border-radius: var(--border-radius);
    margin-top: 1.5rem;
    text-align: center;
}

/* --- Pie de Página --- */
footer {
    text-align: center;
    padding: 1rem;
    background-color: var(--surface-color);
    border-top: 1px solid var(--border-color);
    width: 100%;
    margin-top: auto;
}

/* --- Media Queries --- */
@media (max-width: 550px) {
    .page-title-container h1 { font-size: 1.8rem; }
    .page-title-container p { font-size: 1rem; }
    .calculator-card, .info-card, .results-card { padding: 1.5rem; }

    header {
        justify-content: space-between;
        padding: 0.75rem 1rem;
    }

    .logo {
        max-height: 40px;
    }

    .header-nav {
        gap: 1rem;
    }

    .nav-button {
        padding: 0.5rem 1rem;
        font-size: 0.85rem;
    }

    .nav-button i {
        font-size: 0.8rem;
    }

    /* --- Estilos para tabla de resultados en móvil --- */
    .results-card h2 {
        font-size: 1.2rem;
    }

    .results-card table {
        display: block;
    }

    .results-card tbody {
        display: block;
    }

    .results-card tr {
        display: flex;
        flex-direction: column;
        background-color: var(--bg-color);
        border: 1px solid var(--border-color);
        border-radius: var(--border-radius);
        padding: 1rem;
        margin-bottom: 1rem;
        position: relative;
    }

    .results-card tr:last-child {
        margin-bottom: 0;
    }

    .results-card td {
        display: block;
        padding: 0;
        border: none;
        width: 100% !important;
    }

    .results-card td:first-child {
        font-size: 0.85rem;
        font-weight: normal;
        color: #888;
        margin-bottom: 0.5rem;
    }

    .results-card td:nth-child(2) {
        font-size: 1.15rem;
        margin-bottom: 0;
        padding-right: 2.5rem;
        word-wrap: break-word;
        overflow-wrap: break-word;
    }

    .copy-cell {
        position: absolute;
        top: 1rem;
        right: 1rem;
        width: auto !important;
        font-size: 1.2rem;
    }

    .binary-data {
        font-size: 0.95rem;
        line-height: 1.4;
    }
}