:root {
    --fondologin:    #2c3e50;
    --tarjetalogin:  rgba(44, 62, 80, 0.85);
    --botonloginini: #3498db;
    --botonloginfin: #2980b9;
    --textologin:    #ecf0f1;
    --radioborde:    6px;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--fondologin);
    margin: 0;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 16px;
}

/* ── Tarjeta de login ───────────────────────────────────── */
.login-container {
    background: linear-gradient(var(--tarjetalogin), var(--tarjetalogin)),
                url('../imagenes/login.png') no-repeat center center;
    background-size: cover;
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    width: 100%;
    max-width: 400px;
    padding: 40px 36px;
    border-radius: var(--radioborde);
    box-shadow: 0 20px 40px rgba(0,0,0,0.6);
    border: 1px solid rgba(255,255,255,0.1);
    position: relative;
    overflow: hidden;
}

/* ── Cabecera ───────────────────────────────────────────── */
.header {
    text-align: center;
    margin-bottom: 24px;
}

.header h2 {
    font-size: 22px;
    letter-spacing: 1px;
    color: var(--textologin);
    margin: 0 0 12px;
    text-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

.logo-area { margin-bottom: 12px; }

.login-logo {
    width: 190px;
    height: auto;
    display: block;
    margin: 0 auto;
    filter: drop-shadow(0 0 6px rgba(0,0,0,0.3));
}

/* ── Campos ─────────────────────────────────────────────── */
.input-group {
    margin-bottom: 22px;
    position: relative;
    width: 100%;
}

.posicion-relativa { position: relative; }

.input-group input {
    width: 100%;
    padding: 12px 45px 12px 15px;
    border: none;
    border-bottom: 2px solid rgba(236,240,241,0.3);
    background: transparent;
    outline: none;
    font-size: 15px;
    color: var(--textologin);
    text-align: center;
    position: relative;
    z-index: 1;
    transition: all 0.2s ease-out;
}

.input-group input:focus {
    border-bottom-color: var(--botonloginini);
    box-shadow: 0 1px 0 var(--botonloginini);
}

.input-group input::placeholder {
    color: rgba(236,240,241,0.6);
    text-align: center;
    transition: color 0.2s ease-out;
}

/* ── Ojo contraseña ─────────────────────────────────────── */
.icono-ojo {
    position: absolute;
    right: 15px;
    top: 50%;
    transform: translateY(-50%);
    cursor: pointer;
    color: #ecf0f1;
    transition: color 0.3s;
    z-index: 10;
}

.icono-ojo:hover,
#txtPassword:focus + .icono-ojo {
    color: var(--botonloginini);
}

/* ── Botón ──────────────────────────────────────────────── */
.btn-ingresar {
    width: 100%;
    padding: 13px;
    background: linear-gradient(45deg, var(--botonloginini), var(--botonloginfin));
    border: none;
    border-radius: var(--radioborde);
    color: #fff;
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
    transition: all 0.2s ease;
    margin-top: 18px;
    position: relative;
    overflow: hidden;
    z-index: 1;
    -webkit-tap-highlight-color: transparent;
}

.btn-ingresar:hover {
    background: linear-gradient(45deg, var(--botonloginfin), var(--botonloginini));
    box-shadow: 0 6px 16px rgba(0,0,0,0.3);
    transform: translateY(-1px);
}

.btn-ingresar:active { transform: translateY(0); }

/* ── Mensaje respuesta ──────────────────────────────────── */
#response-message {
    margin-top: 18px;
    text-align: center;
    font-weight: 500;
    color: #e74c3c;
    font-size: 13px;
    opacity: 0;
    transition: opacity 0.3s ease;
}

/* ── Contenedor de error de estado ─────────────────────── */
.error-container {
    background: white;
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
    text-align: center;
    max-width: 500px;
    width: 100%;
}
.error-icon  { font-size: 50px; color: #e74c3c; margin-bottom: 20px; }
.error-title { color: #2c3e50; font-size: 24px; margin-bottom: 10px; }
.error-msg   { color: #7f8c8d; font-size: 16px; line-height: 1.5; margin-bottom: 25px; }
.btn-retry {
    background: #3498db; color: white; border: none;
    padding: 10px 20px; border-radius: 5px;
    cursor: pointer; text-decoration: none; font-size: 14px;
}
.btn-retry:hover { background: #2980b9; }

/* ══════════════════════════════════════════════════════════
   RESPONSIVE
   ══════════════════════════════════════════════════════════ */

/* Tablet (≤ 768px) */
@media (max-width: 768px) {
    .login-container {
        max-width: 420px;
        padding: 36px 28px;
    }

    .login-logo { width: 160px; }

    .header h2 { font-size: 20px; }
}

/* Móvil grande (≤ 480px) */
@media (max-width: 480px) {
    body { padding: 12px; align-items: flex-start; padding-top: 40px; }

    .login-container {
        max-width: 100%;
        padding: 28px 20px;
        border-radius: 10px;
    }

    .login-logo { width: 130px; }

    .header h2 { font-size: 18px; letter-spacing: 0.5px; }

    .input-group { margin-bottom: 18px; }

    .input-group input { font-size: 14px; padding: 11px 40px 11px 12px; }

    .btn-ingresar { font-size: 15px; padding: 12px; }

    .error-container { padding: 28px 20px; }
    .error-title { font-size: 20px; }
}

/* Móvil pequeño (≤ 360px) */
@media (max-width: 360px) {
    body { padding-top: 24px; }

    .login-container { padding: 22px 16px; }

    .login-logo { width: 110px; }

    .header h2 { font-size: 16px; }

    .input-group input { font-size: 13px; }

    .btn-ingresar { font-size: 14px; }
}