/* Importar la fuente Montserrat */
@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@400;500;600;700&display=swap');

/* --- 1. Variables CSS (Custom Properties) para Theming --- */
:root {
    --bg-gradient: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    --card-bg: rgba(255, 255, 255, 0.4);
    --card-border: rgba(255, 255, 255, 0.6);
    --text-color: #343a40;
    --text-color-light: #6c757d;
    --primary-color: #00429E;
    --secondary-color: #00FF41;
    --warning-color: #e57373; /* Rojo claro para alertas */
    --btn-primary-bg: linear-gradient(90deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    --btn-secondary-bg: #6c757d;
    --input-bg: rgba(255, 255, 255, 0.5);
    --input-border: #ced4da;
    --focus-glow: rgba(0, 66, 158, 0.35);
    --transition-speed: 0.3s;
}

body.dark-theme {
    --bg-gradient: linear-gradient(135deg, #232526 0%, #414345 100%);
    --card-bg: rgba(30, 30, 30, 0.4);
    --card-border: rgba(255, 255, 255, 0.1);
    --text-color: #f8f9fa;
    --text-color-light: #adb5bd;
    --primary-color: #00429E;
    --secondary-color: #00FF41;
    --warning-color: #ff8a80; /* Rojo más claro para mejor contraste en oscuro */
    --btn-secondary-bg: #495057;
    --input-bg: rgba(50, 50, 50, 0.5);
    --input-border: #495057;
    --focus-glow: rgba(0, 255, 65, 0.4);
}

*, *::before, *::after {
    box-sizing: border-box;
}

body {
    font-family: 'Montserrat', sans-serif;
    margin: 0;
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: var(--bg-gradient);
    color: var(--text-color);
    transition: background var(--transition-speed) ease, color var(--transition-speed) ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes scaleIn {
    from { transform: scale(0); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

.main-container {
    display: flex;
    gap: 25px;
    width: 95%;
    max-width: 950px;
    animation: fadeIn 0.6s ease-out;
}

.left-container {
    display: flex;
    flex-direction: column;
    gap: 20px;
    width: 180px;
    flex-shrink: 0;
}

.buttons {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.buttons button {
    width: 100%;
    padding: 12px 20px;
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all var(--transition-speed) ease;
    font-size: 1rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.buttons button i {
    margin-right: 10px;
}

#concatenate-button, #copy-button {
    background: var(--btn-primary-bg);
}

#clear-button {
    background: var(--btn-secondary-bg);
}

.buttons button:hover:not(:disabled) {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
}

.buttons button:disabled {
    background: #adb5bd;
    cursor: not-allowed;
    opacity: 0.7;
}

.container {
    background: var(--card-bg);
    padding: 40px;
    border-radius: 20px;
    border: 1px solid var(--card-border);
    box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.15);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    width: 100%;
    transition: background var(--transition-speed) ease;
}

label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-color-light);
    font-weight: 500;
    font-size: 0.9rem;
}

input[type="text"], textarea, select {
    width: 100%;
    padding: 14px;
    border: 1px solid var(--input-border);
    border-radius: 8px;
    font-size: 1rem;
    color: var(--text-color);
    background: var(--input-bg);
    transition: all var(--transition-speed) ease;
    font-family: 'Montserrat', sans-serif;
}

input[type="text"]:focus, textarea:focus, select:focus {
    outline: none;
    border-color: var(--primary-color);
    background: transparent;
    box-shadow: 0 0 0 4px var(--focus-glow);
}

textarea {
    resize: both;
    min-height: 120px;
    max-height: 400px;
    overflow: auto;
}

textarea.warning {
    border-color: var(--warning-color);
    box-shadow: 0 0 0 4px rgba(var(--warning-color-rgb, 229, 115, 115), 0.2); /* RGB para compatibilidad */
}

.input-section {
    display: flex;
    gap: 20px;
    margin-bottom: 25px;
}

.input-section div { width: 100%; }

.options-section, .text-section { margin-bottom: 25px; }

.radio-group { display: flex; align-items: center; gap: 8px; }
.radio-group input[type="radio"] { display: none; }
.radio-group label {
    margin-right: 15px;
    cursor: pointer;
    color: var(--text-color);
    font-weight: 500;
    position: relative;
    padding-left: 28px;
}
.radio-group label::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 18px;
    height: 18px;
    border: 2px solid var(--text-color-light);
    border-radius: 50%;
    transition: all var(--transition-speed) ease;
}
.radio-group label::after {
    content: '';
    position: absolute;
    left: 5px;
    top: 50%;
    transform: translateY(-50%) scale(0);
    width: 10px;
    height: 10px;
    background-color: var(--primary-color);
    border-radius: 50%;
    transition: all var(--transition-speed) ease;
}
.radio-group input[type="radio"]:checked + label::before {
    border-color: var(--primary-color);
}
.radio-group input[type="radio"]:checked + label::after {
    transform: translateY(-50%) scale(1);
}

.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 15px;
}

.checkbox-group input[type="checkbox"] {
    margin-right: 10px;
}

.counter {
    margin-top: 8px;
    font-size: 0.85rem;
    color: var(--text-color-light);
    font-weight: 500;
    transition: color var(--transition-speed) ease;
}

.counter.warning {
    color: var(--warning-color);
}

.counter .warning-icon {
    display: none;
    font-size: 0.9rem;
    margin-right: 8px;
    color: var(--warning-color);
}

.counter.warning .warning-icon {
    display: inline-block;
    animation: scaleIn 0.3s ease-out;
}

#shortcut-reminder {
    padding: 15px;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    border-radius: 12px;
    font-size: 0.9rem;
    color: var(--text-color-light);
    transition: all var(--transition-speed) ease;
}
#shortcut-reminder strong { display: block; margin-bottom: 10px; color: var(--text-color); font-weight: 600; }
#shortcut-reminder ul { list-style-type: none; padding: 0; margin: 0; }
#shortcut-reminder li { margin-bottom: 5px; }
#shortcut-reminder kbd {
    display: inline-block;
    padding: 4px 8px;
    background: rgba(128, 128, 128, 0.2);
    border: 1px solid rgba(128, 128, 128, 0.3);
    border-radius: 4px;
    font-family: 'Montserrat', sans-serif;
    color: var(--text-color);
}

.theme-switcher-container { display: flex; justify-content: center; }
.theme-switcher { position: relative; display: inline-block; width: 60px; height: 34px; cursor: pointer; }
.theme-switcher input { opacity: 0; width: 0; height: 0; }
.slider {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: #ccc;
    transition: var(--transition-speed);
    border-radius: 34px;
}
.slider:before {
    position: absolute;
    content: "";
    height: 26px; width: 26px;
    left: 4px; bottom: 4px;
    background-color: white;
    transition: var(--transition-speed);
    border-radius: 50%;
}
input:checked + .slider { background-color: var(--primary-color); }
input:focus + .slider { box-shadow: 0 0 1px var(--primary-color); }
input:checked + .slider:before { transform: translateX(26px); }

@media (max-width: 768px) {
    body { padding: 15px; }
    .main-container { flex-direction: column; align-items: center; }
    .left-container { width: 100%; max-width: 400px; order: 2; }
    .container { order: 1; width: 100%; padding: 25px; }
    .input-section { flex-direction: column; }
    .counter { font-size: 0.8rem; }
    .counter .warning-icon { font-size: 0.8rem; }
    #shortcut-reminder ul { display: flex; flex-direction: row; justify-content: space-around; }
    #shortcut-reminder li { flex: 1; text-align: center; }
    .buttons { flex-direction: row; justify-content: space-around; }
}

.custom-swal-popup {
    background: var(--card-bg) !important;
    border-radius: 15px !important;
    border: 1px solid var(--card-border) !important;
    backdrop-filter: blur(10px) !important;
    -webkit-backdrop-filter: blur(10px) !important;
    box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.15) !important;
    font-family: 'Montserrat', sans-serif !important;
}

.custom-swal-title {
    color: var(--text-color) !important;
    font-weight: 600 !important;
}

.custom-swal-progress-bar {
    background: var(--btn-primary-bg) !important;
}

.swal2-icon.swal2-success .swal2-success-ring {
    border-color: rgba(0, 255, 65, 0.4) !important;
}
.swal2-icon.swal2-success .swal2-success-line-tip,
.swal2-icon.swal2-success .swal2-success-line-long {
    background-color: var(--secondary-color) !important;
}

.swal2-icon.swal2-info {
    border-color: var(--primary-color) !important;
    color: var(--primary-color) !important;
}

.swal2-icon.swal2-warning {
    border-color: #f8bb86 !important;
    color: #f8bb86 !important;
}

.swal2-icon.swal2-error {
    border-color: #f27474 !important;
}
.swal2-icon.swal2-error [class^=swal2-x-mark-line] {
    background-color: #f27474 !important;
}

/* --- 2. Estilos específicos para <select> en modo oscuro --- */

body.dark-theme select {
    background-color: var(--input-bg) !important;
    color: var(--text-color) !important;
    border-color: var(--input-border) !important;
}

body.dark-theme select:focus {
    box-shadow: 0 0 0 4px var(--focus-glow) !important;
    border-color: var(--primary-color) !important;
}

/* Estilo para las opciones del menú desplegable */
body.dark-theme select option {
    background-color: var(--card-bg) !important;
    color: var(--text-color) !important;
    padding: 8px 12px;
    border: none;
}

/* Para Firefox: fuerza el color de texto en las opciones */
body.dark-theme select option {
    -moz-appearance: none;
    appearance: none;
}

/* Elimina el estilo nativo del select para mayor control (opcional, pero recomendado) */
select {
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    position: relative;
    padding-right: 30px; /* espacio para la flecha */
}

/* Flecha personalizada (opcional, mejora UX) */
select::after {
    content: '▼';
    position: absolute;
    right: 12px;
    pointer-events: none;
    color: var(--text-color-light);
    font-size: 0.8rem;
    transition: color var(--transition-speed) ease;
}

body.dark-theme select::after {
    color: var(--text-color-light);
}