/* Variables de marca X */
:root {
    --x-black: #000000;
    --x-blue: #1d9bf0;
    --x-gray-border: #eff3f4;
    --x-text-main: #0f1419;
    --x-text-secondary: #536471;
    --bg-light: #f7f9f9;
    --bg-soft: #f8f9fa;
    --dark-bg: #343a40;
}

body {
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-light);
    color: var(--x-text-main);
}

/* Header con estilo Dark Mode */
.app-header {
    background: var(--x-black);
    color: white;
    padding: 50px 20px;
    border-radius: 0 0 40px 40px;
}

/* Tarjeta de la herramienta */
.tool-card {
    border-radius: 24px;
    border: 1px solid var(--x-gray-border);
    box-shadow: 0 10px 30px rgba(0,0,0,0.04);
    background: white;
}

/* Área de texto */
textarea#post-input {
    border: 2px solid var(--x-gray-border) !important;
    border-radius: 16px !important;
    font-size: 19px !important;
    padding: 15px;
    transition: all 0.2s ease;
    resize: none;
}

textarea#post-input:focus {
    border-color: var(--x-blue) !important;
    background-color: #fff;
    box-shadow: 0 0 0 4px rgba(29, 155, 240, 0.1) !important;
}

/* Barra de progreso personalizada */
.progress {
    background-color: #e6ecf0;
    height: 10px !important;
}

.progress-bar {
    transition: width 0.3s ease, background-color 0.3s ease;
}

/* Estados de la barra */
.bg-x-normal { background-color: var(--x-blue) !important; }
.bg-x-warning { background-color: #ffd200 !important; } /* Amarillo X */
.bg-x-danger { background-color: #f4212e !important; }  /* Rojo X */

/* --- Footer --- */
footer {
    background-color: var(--dark-bg);
    color: var(--white-color);
    font-size: 0.85rem;
    text-align: center;
    padding: 1rem 0;
    margin-top: 2rem;
}
.container-footer {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 15px;
}
footer p {
    margin: 0;
    color: #adb5bd; /* white-50 */
}
.footer-link {
    color: #17a2b8; /* text-info */
    text-decoration: none;
}
.footer-link:hover {
    color: var(--white-color);
    text-decoration: underline;
}
.blockquote {
    border-left: 4px solid var(--primary-color);
    padding-left: 1rem;
    margin-left: 0;
    margin-top: 1rem;
}
.blockquote-footer {
    display: block;
    font-size: 0.8rem;
    color: var(--secondary-color);
}