/* --- Paleta de Colores y Variables --- */
:root {
    --bg-dark: #121212;
    --primary-glow: rgba(0, 191, 255, 0.5);
    --primary-color: #00BFFF; /* DeepSkyBlue */
    --card-bg: #1e1e1e;
    --text-color: #EAEAEA;
    --text-muted: #888;
    --border-color: #333;
    --success-color: #00FF7F; /* SpringGreen */
    --warning-color: #FFD700; /* Gold */
    --danger-color: #FF4500;  /* OrangeRed */
    --whatsapp-color: #25D366;
}

/* --- Estilos Globales y Animaciones --- */
* { box-sizing: border-box; }

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

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    10%, 30%, 50%, 70%, 90% { transform: translateX(-5px); }
    20%, 40%, 60%, 80% { transform: translateX(5px); }
}

body {
    font-family: 'Poppins', sans-serif;
    margin: 0;
    background-color: var(--bg-dark);
    color: var(--text-color);
    line-height: 1.6;
}

/* --- Pantalla de Login --- */
#login-screen {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    background: linear-gradient(45deg, #1a1a2e, #16213e);
    animation: fadeIn 0.5s ease-out;
}
.login-box {
    background: var(--card-bg);
    padding: 2.5rem;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    text-align: center;
    width: 90%;
    max-width: 350px;
    border: 1px solid var(--border-color);
}
.login-box h1 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    font-size: 2.5rem;
}
.login-box p {
    color: var(--text-muted);
    margin-bottom: 2rem;
}
#login-form input {
    width: 100%;
    padding: 0.8rem;
    margin-bottom: 1rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-dark);
    color: var(--text-color);
    font-size: 1rem;
}
#login-form .error {
    color: var(--danger-color);
    margin-bottom: 1rem;
    display: none; /* Oculto por defecto */
}
.login-box .btn {
    width: 100%;
    font-weight: 600;
}

/* --- Contenedor Principal de la App (Oculto al inicio) --- */
#app-container {
    display: none;
    position: relative;
    max-width: 1200px;
    margin: 0 auto;
    padding: 1.5rem;
    animation: fadeIn 0.8s ease-out;
}

/* --- Banner de Notificación --- */
#admin-notification {
    display: none; /* Oculto por defecto */
    background-color: var(--warning-color);
    color: #121212;
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    text-align: center;
    font-weight: 600;
    position: relative;
    animation: fadeIn 0.5s;
}
#admin-notification .close-alert {
    position: absolute;
    top: 50%;
    right: 1rem;
    transform: translateY(-50%);
    font-size: 1.5rem;
    font-weight: bold;
    cursor: pointer;
    color: #121212;
    opacity: 0.7;
}
#admin-notification .close-alert:hover {
    opacity: 1;
}

/* --- Componentes UI --- */
.btn {
    padding: 0.7rem 1.5rem;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    text-decoration: none;
    color: white;
    background: linear-gradient(45deg, #3D52FC, #00BFFF);
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 191, 255, 0.2);
    font-weight: 600;
}
.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0, 191, 255, 0.4);
}
#btn-logout {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    background: var(--danger-color);
    box-shadow: 0 4px 15px rgba(255, 69, 0, 0.2);
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
}

/* --- Dashboard y Tarjetas de Estadísticas --- */
.main-header { margin-bottom: 2rem; text-align: center; padding-top: 3rem; }
.main-header h1 { font-size: 2.5rem; color: var(--text-color); }
.stats-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.5rem;
}
.card {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
    border-left: 5px solid var(--primary-color);
    transition: all 0.3s ease;
}
.card:hover { transform: translateY(-5px); }
.card h3 { margin-top: 0; color: var(--text-muted); font-size: 1rem; }
.card p { font-size: 2.5rem; font-weight: 700; color: var(--text-color); margin: 0; }
.card.status-por-vencer { border-color: var(--warning-color); }
.card.status-vencido { border-color: var(--danger-color); }

/* --- Gestor de Clientes y Tabla --- */
.client-manager {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 10px;
    margin-top: 2rem;
}
.toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1.5rem;
}
.search-filter { display: flex; gap: 0.5rem; flex-grow: 1; max-width: 400px; }
#search-input, #filter-select {
    padding: 0.6rem;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    background-color: var(--bg-dark);
    color: var(--text-color);
    width: 100%;
}
.table-container { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 1rem; text-align: left; border-bottom: 1px solid var(--border-color); }
thead { background-color: #2a2a2a; }
tbody tr { transition: background-color 0.2s; }
tbody tr:hover { background-color: #2c2c2c; }

.status { padding: 0.3rem 0.8rem; border-radius: 20px; color: #121212; font-size: 0.8rem; font-weight: 600; text-align: center; display: inline-block; }
.status-activo { background-color: var(--success-color); }
.status-por-vencer { background-color: var(--warning-color); }
.status-vencido { background-color: var(--danger-color); }

.actions-cell { display: flex; gap: 10px; align-items: center; }
.btn-icon { background: none; border: none; font-size: 1.5rem; cursor: pointer; color: var(--text-muted); transition: color 0.2s; }
.btn-icon:hover { color: var(--primary-color); }
.btn-whatsapp { display: inline-flex; align-items:center; justify-content:center; width: 32px; height: 32px; background-color: var(--whatsapp-color); color: white; border-radius: 50%; text-decoration: none; font-size: 1.2rem; font-weight: 600; transition: all 0.2s; }
.btn-whatsapp:hover { transform: scale(1.1); }
.btn-whatsapp.disabled { background-color: #555; cursor: not-allowed; opacity: 0.5; }

/* --- Modal --- */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0; top: 0;
    width: 100%; height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.7);
    backdrop-filter: blur(5px);
    align-items: center;
    justify-content: center;
}
.modal-content {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 15px;
    width: 90%;
    max-width: 500px;
    position: relative;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    border: 1px solid var(--border-color);
    animation: fadeIn 0.3s;
}
.close-button { color: var(--text-muted); position: absolute; top: 15px; right: 20px; font-size: 28px; font-weight: bold; cursor: pointer; transition: color 0.2s; }
.close-button:hover { color: var(--primary-color); }
.form-group { margin-bottom: 1rem; }
.form-group label { display: block; margin-bottom: 0.5rem; font-weight: 600; color: var(--text-muted); }
.form-group input, .form-group select { width: 100%; padding: 0.7rem; border: 1px solid var(--border-color); border-radius: 5px; background-color: var(--bg-dark); color: var(--text-color); }
.form-group-inline { display: flex; gap: 1rem; }
.date-display { font-weight: bold; color: var(--primary-color); background-color: #2a2a2a; padding: 0.5rem; border-radius: 5px; text-align: center;}

/* --- Responsive Design --- */
@media (max-width: 768px) {
    body { font-size: 14px; }
    .main-header h1 { font-size: 2rem; }
    #btn-logout { top: 1rem; right: 1rem; }
    .toolbar { flex-direction: column; align-items: stretch; }
    table thead { display: none; }
    table, table tbody, table tr, table td { display: block; width: 100%; }
    table tr { margin-bottom: 1.5rem; border: 1px solid var(--border-color); border-radius: 8px; padding: 0.5rem; }
    table td { text-align: right; padding-left: 50%; position: relative; border-bottom: 1px solid #2a2a2a; }
    table td:last-child { border-bottom: none; }
    table td::before { content: attr(data-label); position: absolute; left: 10px; width: 45%; padding-right: 10px; text-align: left; font-weight: 600; color: var(--text-muted); }
}