:root {
    --primary: #2563eb;
    --text-main: #1f2937;
    --text-muted: #6b7280;
    --bg: #eef1f6;
    --card-bg: #ffffff;
    --border: #d1d5db;
    --shadow: 0 10px 40px rgba(0,0,0,0.12);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Segoe UI", sans-serif;
}

body {
    background: var(--bg);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

/* Contenedor principal */
.login-container {
    width: 100%;
    max-width: 380px;
    padding: 20px;
}

/* Tarjeta */
.login-card {
    background: var(--card-bg);
    padding: 42px 30px;
    border-radius: 22px;
    box-shadow: var(--shadow);
    text-align: center;
    animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(15px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Marca */
.brand-text-only .brand-title {
    font-size: 34px;
    font-weight: 800;
    letter-spacing: -1px;
    color: var(--primary);
    margin-bottom: 4px;
}

.brand-text-only .brand-sub {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 30px;
}

/* Labels */
label {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-main);
    display: block;
    text-align: left;
    margin-bottom: 5px;
}

/* Input group */
.input-group {
    position: relative;
    margin-bottom: 18px;
}

.icon {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 20px;
    color: var(--text-muted);
}

/* Inputs */
input {
    width: 100%;
    padding: 14px 14px 14px 46px;
    border-radius: 12px;
    border: 1px solid var(--border);
    background: #f9fafb;
    font-size: 15px;
}

input:focus {
    outline: none;
    border-color: var(--primary);
    background: #fff;
}

/* Botón login */
.btn-login {
    width: 100%;
    margin-top: 12px;
    padding: 14px;
    border: none;
    background: var(--primary);
    color: white;
    font-size: 17px;
    font-weight: 600;
    border-radius: 12px;
    cursor: pointer;
    display: flex;
    justify-content: center;
    gap: 8px;
    align-items: center;
    box-shadow: 0 12px 25px rgba(37, 99, 235, 0.45);
}

.btn-login:hover {
    background: #1d4ed8;
}

/* Mensaje de error */
.error-msg {
    background: #fee2e2;
    color: #b91c1c;
    padding: 12px;
    border-radius: 10px;
    margin-bottom: 16px;
    display: none; /* JS lo muestra */
    align-items: center;
    gap: 6px;
    font-size: 14px;
    text-align: center;
}

/* iconos especiales */
.icon-small {
    font-size: 16px;
    vertical-align: middle;
}

.icon-medium {
    font-size: 20px;
    vertical-align: middle;
}

/* Mostrar contraseña */
.password-group {
    position: relative;
}

.show-pass {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 22px;
    color: var(--text-muted);
    cursor: pointer;
    user-select: none;
    transition: color 0.2s;
}

.show-pass:hover {
    color: var(--primary);
}